Laser deleting device and laser deleting method

FIELD: physics, computer engineering.

SUBSTANCE: laser deleting device includes a transfer unit for moving a reversible thermal recording medium containing display information with a predefined movement speed, wherein the reversible thermal recording medium reversibly changes its colour hue depending on temperature; and a laser deleting unit configured to delete display information by irradiating the reversible thermal recording medium with a laser beam during movement of the reversible thermal recording medium and by deflecting the laser beam with a predefined scanning speed which is lower than the predefined movement speed in the same direction as the movement of the reversible thermal recording medium.

EFFECT: invention enables recording and deleting on a medium over a short clock time.

15 cl, 7 dwg

 

The technical field

The present invention, in General, relates to devices laser abrasion and methods laser erasing. In particular, the present invention relates to a laser device erasing and laser erase that provide exposure to media reversible thermal recording which reversibly changes its color tone depending on temperature by a laser beam, and erasing of the information displayed on the media reversible thermal recording.

The level of technology

Traditionally, in terms of resource saving and environmental protection, the known device updates the information recording and how to update information in records in which the carrier of the reversible thermal recording, where the color appears and disappears under the action of heat, is used to label the shipping container logistics conveyor system of the type disclosed in Japanese patent application No. publishing 2006-231647 (which in the following we will refer to patent document 1).

In the update device information recording and updating information recording disclosed in patent document 1, the recording is carried out by pressing thermal head to the label. However, due to the complexity of fixing thermal head relative to the carrier of the reversible thermal recording, was the development of otano many devices and methods for the implementation of non-contact recording and erasing using a laser, disclosed in Japanese patent application No. publishing 2007-76122 (which in the following we will refer to patent document 2) and Japanese patent application No. publishing 2001-88333 (which in the following we will refer to patent document 3).

In patent document 2 is disclosed the device information update records where a single laser device carries out writing and erasing by deflection of the laser and scanning stops media reversible thermal recording laser. In addition, in patent document 3 is disclosed erasing recording device that performs recording and erasing by scanning media reversible thermal recording due to the movement of the carrier reversible thermal recording relative to the stationary laser.

Thus, using a laser, you can write and erase on the media reversible thermal recording without the formation of contact and the carrier of the reversible thermal recording can be used as the label of the shipping container logistics system conveyor-type.

However, for example, the configuration disclosed in patent document 2, in the device information update records where a single laser device performs both recording and erasing by deflection of the laser to scan, there is a problem uvelichenie tact. Here, the "clock time" means the time required for Assembly or processing of products in a specific Assembly installation or a process plant production line, or the total time of manufacture of the product on the production line.

The clock time can generally refer to as the "cycle time". The time quantum can have as their objective the establishment of performance in accordance with customer requirements or may have to specify the productivity or throughput.

In addition, even if provided with two laser device, and erasing and writing are the respective laser devices, because to erase requires more energy than to write, there is a problem of increasing the time of erasing compared with the recording time.

In addition, even if you use the method comprising the stop of the carrier of the reversible thermal recording and the implementation of scanning by the deflection of the laser since the move, stop shipping container take time, there is the problem of the short time allocated to erase during a time quantum.

In addition, for example, the configuration disclosed in patent document 3, in the Erasure unit of the recording, which scans by fixing the laser and move media reversible Ter the systematic recording, if the media is reversible thermal recording has a small width relative to the width of the shipping container, there is the problem of the short time allocated to erase during a time quantum.

The invention

Accordingly, embodiments of the present invention can provide a laser device erasing and laser erase that address one or more of the above problems.

In particular, embodiments of the present invention can provide a laser device erasing and laser erase that allow you to write and erase on the media reversible thermal recording within a short time of time with the use of the laser without the formation of contact, despite a simple configuration.

According to one aspect of the present invention, a laser abrasion, including:

a transfer unit for moving media reversible thermal recording containing information display, with a predetermined speed, and the carrier of the reversible thermal recording reversibly changes its color tone depending on temperature, and

block the laser erasing, made with the possibility of erasing the information display by irradiating the medium term reversible the standard recording laser beam during movement of the carrier reversible thermal recording and by deflection of the laser beam with a predetermined scanning speed, lower than a predetermined speed in the same direction as the direction of movement of the carrier reversible thermal recording.

According to another aspect of the present invention provides a method of laser erasing, comprising the steps are:

move the carrier of the reversible thermal recording containing information display, with a predetermined speed, and the carrier of the reversible thermal recording reversibly changes its color tone depending on temperature; and

erase the information display by irradiating the carrier of the reversible thermal recording laser beam during movement of the carrier reversible thermal recording with a predetermined speed and by deflection of the laser beam with a predetermined scanning speed that is lower than the predetermined speed in the same direction as the direction of movement of the carrier reversible thermal recording.

Brief description of drawings

Figure 1 - diagram showing the overall configuration of the illustrative conveyor systems that use laser device erase option of implementing the present invention.

Figure 2 is a configuration diagram showing an illustrative laser device erase the implementation of this option the image is to be placed.

Figa illustrative diagram showing an example of the operation of the erase device erase this variant implementation at the starting point of the erase.

Figv illustrative diagram showing an example of the operation of the erase device erase this variant implementation in the intermediate point of the erase.

Figs illustrative diagram showing an example of the operation of the erase device erase this variant implementation at the end point of the erase.

Figa diagram showing the erase operation of the first conventional laser device erase at the starting point of erasing in the order of comparative example.

Figv diagram showing the erase operation of the first conventional laser device erase in the intermediate point of erasing in the order of comparative example.

Figs diagram showing the erase operation of the first conventional laser device erase end point of the erase in the order of comparative example.

Figa diagram showing the erase operation of the second conventional laser device erase at the starting point of erasing in the order of comparative example.

Figv diagram showing the erase operation of the second conventional laser device erase in the intermediate point of erasing in the order cf writelog example.

Figs diagram showing the erase operation of the second conventional laser device erase end point of the erase in the order of comparative example.

6 is a diagram showing the sequence of operations of the laser erasing using a laser device erase this option implementation.

7 is an illustrative diagram of staining and discoloration using media reversible thermal recording.

Description of embodiments

The description is given with reference to the accompanying drawings of embodiments of the present invention.

1 shows a diagram showing the overall configuration of the illustrative conveyor systems that use laser device erase option of implementing the present invention. According to figure 1, the conveyor system of this variant implementation includes the roller conveyor 10, the conveyor belt 12, the encoder 15, the sensors 20 to 22, the stoppers 30 and 32, block 60 laser erase node 70 management system and node 90 laser writing. Here, the block 60 laser abrasion and node 70 of the control system is comprised of the device 80 laser erase this option implementation.

In addition, according to figure 1, the container 100, be transferred are shown as the same type of components. Pertapis who controls the label 101, want to erase the device 80 laser erase this option, the exercise deposited on the side surface of the container 100. Rewritable label 101 is made of medium reversible thermal recording, allowing printing and erasing by heat, and is formed so as to give the opportunity to wash already extracted information display and print the following. Here, according to figure 1, a rewritable label 101 printed information letters "ABC".

The roller conveyor 10 and the conveyor belt 12 are blocks transfer to move and transfer container 100. The roller conveyor 10 has a generally linear configuration due to the parallel placement of multiple rollers 11 with a predetermined interval and due to the fact that the line is oriented in the direction of rotation of the rollers. The roller conveyor 10 provides rapid movement of the container 100 due to the rapid rotation of the respective rollers 11. In addition, you can adjust the stop and the speed of the rollers 11 in a short block and individually to control the movement of the containers 100 on the line. Roller conveyors 10 are used in places other than those where the block 60 laser erase.

On the other hand, the belt conveyor 12 includes a tape 13, provided with the ability to coil wok is ug multiple rollers 11. Belt conveyor 12 cannot rotate faster than the roller conveyor 10 as the tape 13 is wound around the belt conveyor 12, but the conveyor belt 12 can move all the containers 100 at a constant speed, maintaining the stability of all of the containers 100, due to the high friction forces between the belt 13 and the container 100. If erasing of the information displayed on the surface of the rewritable label 101 is carried out by block 60 laser erasing, it is necessary to move the rewritable label 101 with a stable constant speed for the irradiation of the rewritable label 101 of the laser beam L. Accordingly, the conveyor belt 12 is provided in a position corresponding to the block 60 laser erase.

The encoder 15 is a block determine the speed to determine the speed of movement of the container 100, and therefore, the rewritable label 101. In the case of belt conveyor 12, the speed of movement of the container 100 is stable, and the container 100 is moving at a speed approximately proportional to the speed of rotation of the rollers 11. Accordingly, if the rotation speed of the rollers 11 can be determined by using the encoder 15, you can also determine the speed of movement of the rewritable label 101.

Sensors 20-22 are blocks of definitions to determine the presence of the container 100. For example, sensors 2022 may be configured to determine the presence of a container 100 before sensors 20-22, if the sensors 20-22 emit light and record the reflected light.

The stoppers 30-32 are blocks to stop the container 100 in a predetermined position. If the sensors 20-22 determine the presence of the container 100, the stoppers 30-32 can stabilize and stop the container 100 through the container 100 between them. Here, the stoppers 30 and 32 can have various configurations. For example, a possible configuration in which the stoppers 30 and 32 are plate blocks 30-32, protruding upward from the space between the rollers 11 and stopping the container 100.

Block 60 laser erasing is a block radiating laser light on the rewritable label 101 and erasing the previously recorded information without the formation of contact. Therefore, the block 60 laser erasing includes a laser optical system comprising a laser light source, etc. of the Laser beam L emitted from the block 60 laser abrasion, has a vertically elongated shape, as shown in figure 1, and is formed with a greater length vertically, than the information displayed on the rewritable label 101. Block 60 laser erasing is located next to the conveyor belt 12 and performs erasing movement of the container 100 at a constant speed. Here, the block 60 laser erase initiated and controlled by the node 70 management system. is that the block 60 laser erasing, includes a laser light source, and the part that controls the block 60 laser erase node 70 management system, constitute the entire laser device erase this option implementation.

Node 70 management system is a node for management of the entire conveyor system and connected to the corresponding nodes and parts. The corresponding nodes and parts obey the instructions of the node 70 management system. Block 60 laser erasing is running on node 70 management system.

The node 90 laser writing is a node, irradiating the rewritable label 101 laser beam LW and performing printing without the formation of contact. The laser beam LW node 90 laser writing has a circular beam shape, which allows to irradiate the rewritable label 101 spot different from the one that creates the block 60 laser erase to remove the letters, etc. in a single pass. The node 90 laser writing is located next to the roller conveyor 10 and performs printing during a stop of the container 100.

Let us turn to the explanation of the operation of the conveyor system of this variant implementation. The container 100 is moved from the upper left corner to the lower right corner according to figure 1. The container 100 in the upper-left corner of the conveyor line (which indicates the transport roller is EP 10), temporarily stops before reaching the belt conveyor 12 with the sensor 20 and the stopper 30. Then, when the container 100, in front, passes through the sensor 21, the stopper 20 is released, and the container 100 is transferred onto the belt conveyor 12. This temporary stop is designed to adjust the intervals and other containers 100 that is moving on the belt conveyor 12, and in order to ensure the efficiency of the unit 60 laser erasing. The container 100 on the tape 13 passes in front of the block 60 laser erasing with a predetermined speed. The node 70, the control system determines that the container 100 to be erased, turned out to be in a predetermined position using the sensor 21, and outputs a signal of the beginning of the erase block 60 laser erasing. Block 60 laser erasing signal is received from the start erasing from node 70 management system and deflects the laser L in the same direction as the direction of movement of the container 100, with a predetermined speed within a predetermined time, radiating the laser beam L on the rewritable label 101 with a predetermined capacity. Thanks deflecting movement of the laser beam L, the previously printed data is erased.

The container 100 having a rewritable label 101, the information display which was erased moves, PE is ecodit the next roller conveyor 10 and stops not reaching the node 90 laser writing, using the sensor 22 and the stopper 31. It is necessary that the following container 100 is not hit on the container 100, on which a print is produced, which may result in offset printing. When the container 100, which is ahead of print on which the completed, moves the stopper 31 is released and the following container 100 moves in front of the node 90 laser writing. If the sensor 23 determines that the container 100 to be printed, appeared to be in a predetermined position, the node 70 of the control system stabilizes the container 100, closing the stopper 32, and outputs the signal to start printing on the node 90 laser writing. The node 90 laser writing takes the data printed information and signal the start of printing, and prints the information to the laser. Upon completion of printing, the node 90 laser recording outputs a signal of the completion of printing on the node 70 management system. Node 70 of the control system, adopting the tone printing is finished, release the stopper 32 and moves the container 100 to the next process.

Figure 2 shows a configuration diagram illustrating an example device 80 laser erasing variant implementation of the present invention. The device 80 laser erasing of the present invention, in General, consists of the block 60 laser abrasion and node 70 management system. Block 60 laser erasing includes the manhole is hydrated source 40 of light, the first cylindrical lens 41, the first spherical lens 42, microlensing matrix 43, a second spherical lens 44, the second cylindrical lens 45, the causative agent of 46 laser, galvanothermal 50 and galvanostatically 51. On the other hand, the node 70 management system includes a terminal block 71, the panel 72 of the control unit 73 installation conditions erase unit 77 controls the operation of the erase block 78 laser control and block 79 galvanoplasty. In addition, the block 73 installation conditions erasing includes block 75 installation of the laser power and the block 76 setting the scanning speed. In addition, it is shown that the rewritable label 101 is the object of irradiation. Here, the rewritable label 101 is made of medium reversible thermal recording described according to figure 1.

The laser source 40 of light is a unit radiating a laser beam L. the length of the vertical shape of the laser beam source 40 of light this variant implementation must be greater than the information displayed on the rewritable label 101. This allows you to erase information rewritable label 101, deflecting the laser beam L in a horizontal direction, and erasing rewritable label 101 in a single pass scan.

Provided that the laser source 40 of light has a form that is longer vertically than the information neperedavaemaa tag 101, as mentioned above, you can use different types of laser sources 40 of the world. For example, you can use the matrix of laser diodes, where the laser diodes are disposed vertically. Matrix laser diodes is a module that includes multiple light sources based on laser diode. For example, you can use the matrix of laser diodes, which includes seventeen light sources based on laser diode. In this case, the length of the light sources from the first to the seventeenth may be, for example, 10 mm Laser beams L emitted from a laser source 40 of light matrix, laser diodes, increase multiple lenses 40-45, and achieves uniform distribution of energy density of the laser beams L, and rewritable label 101 is formed of a linear beam with a length of 60 mm and a width of 0.5 mm.

Now describe the function of the respective lenses 41-45. The first cylindrical lens 41 is a lens beam shaping for narrowing the laser beams L emitted from a laser source 40 of light. The first spherical lens 42 is a lens, which momentarily reduces the vertical size of the laser beam L. Mikrolinzy matrix 43 is a lens capable of overlapping adjacent laser beams L in respect of vertically placed seventeen points, emitted from the matrix laser l is W, and forming a vertically elongated beam as a whole. A second spherical lens 44 is a lens height adjustment for height adjustment of the laser beam L with respect to the rewritable label 101. The second cylindrical lens 45 is lens for narrowing the laser beam L and for shaping the laser beam L at the end.

Exciter 46 laser is a circuit that generates an excitation current of the laser source 40 of light. Exciter 46 of the laser controls the laser power according to the instruction from the host 70 management system.

Optical system comprising such a laser source 40 of light, lenses 41-45 and pathogen 46 laser can generate a linear laser beam L.

Galvanothermal 50 is a block variance, which includes the galvanometer 51, provided with a mirror 52 which reflects the laser beam L. Galvanothermal 50 may reject the laser beam L to scan. Galvanostatically 53 is a circuit that controls the angle of the mirror 52 according to the node 70 management system. In particular, galvanostatically 53 compares the signal of the angle sensor and the instruction from the host 70 management system and provides the excitation signal to galvanotherapy 50 so as to minimize the error.

Now we describe the node 70 management system. Terminal block 71 is Blo is om, which electrically connects the corresponding nodes and blocks the conveyor systems described according to figure 1, node 70 management system. Terminal block 71 includes an input terminal for a signal of the beginning of the erase signal deadlock, signal ambient temperature, the signal from the encoder, and the output terminal of the signal to signal the completion of preparation for the erasing signal is active and the Erasure signal failure has occurred. Here, the start signal erase is a signal, in accordance with which the block 60 laser erasing begins the act of erasing; a signal deadlock is a signal that causes the action to erase an emergency stop; and signal the ambient temperature is a signal for correcting the laser power in accordance with the ambient temperature. In addition, the signal encoder is a signal for determining the speed rewritable label 101; signal finalize erase is a signal to indicate reception of a signal of the beginning of erasing; and the active signal erase is a signal to indicate that the erasing is carried out. In addition, a signal failure has occurred is a signal to indicate that the node 70 of the control system has detected the failure, such as failure of the laser, the failure galvanotherapy etc.

Panel 72 pack is Alenia is the user interface, educated in simple displays and switches that allow you to make a choice from the menu and enter the values.

Block 73 installation conditions erase is a block to control panel 72 of the management and for setting various conditions of erasing on the basis of the information entered in the panel 72 of the management. Block 73 installation conditions erase sets, for example, the scan width of the laser beam L that is specified by the user, the scanning speed of the laser beam L, the scanning direction of the laser beam L, the output power of the laser, the delay time of the beginning of the erase speed of movement of the container, etc. in Addition, the block 73 installation conditions erasing includes a nonvolatile memory for storing the established conditions for erase.

Block 73 installation conditions erasing includes block 75 installation of the laser power and the block 76 setting the scanning speed. Block 75 installation of the laser power is a block that sets the laser power for the laser beam L output from the laser source 40 of light. The laser power can be set based on the values entered from the panel 72 of the management. If the laser power is entered directly into the panel 72 of the management, the laser power can be set according to the input. On the other hand, if the laser power is not entered, the appropriate power lateralised and is set on the basis of the values of the input values.

In addition, if the actual speed rewritable label 101 is entered, the motion of the rewritable label 101, unit 77 controls the erase operation, as described below, block 75 installation of the laser power adjusts the installed power of the laser and sets the laser power again on the basis of the actual speed, when driving. However, the implementation of this operation is not always necessary, but if desired may be provided.

Block 76 setting the scanning speed is a block that sets the scanning speed of the laser beam L. In the device 80 laser erase this variant implementation of the block 76 setting the scanning speed sets the scanning speed of the laser beam L to a lower value than the speed of movement of the rewritable label 101. Therefore, if the speed of movement of the container or the speed rewritable label is entered from the panel 72 control the scanning speed of the laser beam L is set to a lower value than the input speed. However, in the absence of specific input block 76 setting the scanning speed refers to the speed of movement of the container or speed rewritable label set and stored in block 73 installation conditions erasing, and who shall set the scanning speed is lower than the speed of movement.

The scanning speed can be set based on rules, for example, certain formulas of arithmetic processing. For example, if it is determined that the scanning speed of half the speed of movement of the container 100 or rewritable label 101, the scanning speed is set according to the rule. The rule, for example the formula for the arithmetic processing, it is possible to choose arbitrarily in accordance with prescribed objectives. For example, a rule can be expressed by a simple formula, such as 1/n (n is an integer) from the speed of movement of the container 100 or rewritable label 101. This reduces the load of arithmetic processing and facilitate the establishment of the scanning speed of the laser beam L.

If unit 77 controls the erase operation is entered, the signal speed is actually the motive(s)in the container 100 or rewritable label 101, block 76 setting the scanning speed may perform the correction based on the speed during the actual move, and can reset the scan rate. However, it does not always needed, but if desired may be provided.

Unit 77 controls the erase operation is a unit that processes the input signal at the terminal block 71, and a control unit 73 setup and conditions erase and instructs the block 78 laser control and block 79 galvanoplasty, and generates an output signal from the terminal unit 71. In addition, the unit 77 controls the erase operation outputs the signal to the block 73 installation conditions erase to provide information in relation to the subject, where the block 73 installation conditions erase performs the correction and reinstalling, such as the speed of movement of the container 100 or rewritable label 101, among the signals from the terminal unit 71. This allows you to make the necessary correction. Here, this correction can be carried out by unit 77 controls the erase operation by reference to information set in the block 73 installation conditions Erasure. Such a procedure can be set differently according to the intended use.

Block 78 laser control controls the excitation laser source 40 of light. In particular, the unit 78 controls the laser converts the output value of the laser prescribed unit 77 controls the erase operation, an analog signal and outputs the analog signal to the exciter 46 of the laser. In addition, the unit 78 controls the laser generates a signal bronirovania for on/off of the laser source 40 of light and outputs a signal bronirovania.

Block 79 galvanoplasty controls the excitation of galvanothermy is and 50. In particular, block 79 galvanoplasty generates an analog signal to move galvanotherapy 50 with the specified speed from the initial position of the scanning end position of the scanning prescribed unit 77 controls the erase operation.

Now, with reference to figa-3C, describe an example of the operation of the erasing laser device erase with this configuration. On figa-3C shows a diagram describing the operation of the erasing laser device erase this option implementation. Here, the same reference positions are used for components similar to those described previously, and the description is omitted.

On figa shows a diagram illustrating an example of an operation of erasing the starting point of the erase. According figa before rewritable label 101 of the container 100 is in front of the unit 60 of the laser erasing unit 60 laser erasing emits a laser beam L from the front of the site rewritable label 101. The laser beam L is emitted from the unit 60 laser erasing ago. After this, the deviation of the laser beam L to scan in the same direction as the direction of movement of the rewritable label 101. In this case, the scanning speed less than the speed of movement of the rewritable label 101. This means that the laser beam L moves forward as R IU the ka 101, but, since the scanning speed less than the speed of movement of the rewritable label 101, the laser beam L does the relative movement back and slowly sweeps up the rewritable label 101 backward.

On FIGU shows a diagram illustrating an example of the erasing process in the intermediate point. According figv, when the rewritable label 101 occupies a position approximately in front of the unit 60 laser erase information displayed on the rewritable label 101 is erased by about half. In addition, the laser beam L is emitted from the unit 60 laser erasing approximately in the forward direction. According figa as the scan begins, more displaced backward relative to the block 60 laser erasing, it turns out that the block 60 laser erasing rays rewritable label 101 of the laser beam L with the use of greater length than half the width of the rewritable label 101, to erase information display with half the width of the rewritable label 101. In other words, the block 60 laser erasing rays rewritable label 101 with a laser beam L for some time.

On figs shows a diagram illustrating an example of the operation of the erase end point of the erase. At the end point of the erase rewritable label 101 more advanced forward relative the guide block 60 laser erasing, and the block 60 laser erasing irradiates the rear edge of the rewritable label 101 of the laser beam L. the Laser beam L is emitted from the unit 60 laser erasing forward. The information displayed on the rewritable label 101, fully washable.

According figa-3C, due to the inclination of the laser beam L with a lower scanning speed than the speed of movement of the rewritable label 101 in the same direction as the direction of movement of the rewritable label 101, it is possible to increase the scanning distance in the direction of back and forth, and you can increase the scan time. This allows you to send a rewritable label 101 sufficient energy and securely erase information display.

On figa-4C shows a diagram showing an example of an operation of erasing the first traditional laser device erase in the order of comparative example. The first conventional device 160 laser performs erase erasing, locking the laser beam L and the moving conveyor belt 12, providing the movement of the spot irradiation with a laser beam L on the rewritable label 101. Here, the same reference position assigned to components similar to those described previously, and the description is omitted.

On figa diagram showing the erase operation at the starting point of the erase. At the starting point of erasing, erasing machinae the Xia, when the front edge of the rewritable label 101 is before the block 60 laser erase.

On FIGU diagram showing the erase operation in the intermediate point. In the intermediate point of the erasing laser beam L is stationary, and the center of the rewritable label 101 occupies the position before the block 60 laser erase.

On figs diagram showing the erase operation at the end point of the erase. At the end point of the erase, the rear edge of the rewritable label 101 is located in front of the unit 60 laser erase.

Thus, in the first conventional device 160 laser erasing, the scanning distance equal to the width of the rewritable label 101. If the device 160 laser erasing trying to tell enough energy rewritable label 101, the conveyor belt 12 should be moved with a low enough speed that leads to an increase in a time quantum.

On figa-5C shows a diagram showing an example of an operation of erasing the second conventional laser device erase in the order of comparative example. The second conventional device 161 laser erasing performs erasing of the information display by stopping the rewritable label 101 and by deflection of the laser beam L. Here, the same reference positions are used for components similar to the above, and the description is omitted.

On figa is a diagram showing the erase operation at the starting point of the erase. At the starting point of the erase rewritable label 101 stops when is before the 161 laser erasing. Then the laser beam L is irradiated on the front edge of the rewritable label 101. After that, the laser beam L is deflected and moves back and rewritable label 101 is scanned.

On FIGU is a diagram showing the erase operation in the intermediate point of the erase. In the intermediate point of the erasing laser beam L moves back and rewritable label 101 is scanned to the center.

On figs is a diagram showing the operation of the erase end point of the erase. At the end point of the erase laser beam L moves to the rear edge of the rewritable label 101, and the scanning of the rewritable label 101 is completed.

Thus, in the second conventional device 161 laser erasing, the distance of the scanning laser beam L is equal to the width of the rewritable label 101. In addition, when the second conventional device 161 laser erasing performs the erase operation, since the conveyor belt 12 must be stopped, the clock time is increased.

According figa-5C, as the device 80 laser erase this variations is that exercise can increase the length of the scan and the scan time compared with conventional devices 160, 161 laser abrasion and can erase information display during movement of the belt conveyor 12, it turns out that the clock time is significantly improved.

Figure 6 shows a diagram illustrating a sequence of processing operations of the laser erasing using a laser device erase this option implementation. Here, figure 6 shows the sequence of processing operations in the case of the implementation of the correction speed. In addition, the same reference position assigned to components similar to those described previously, and the description is omitted.

First of all, in the beginning, length scan direction scan, the scanning speed and the output power of the laser is set by the user and stored in volatile memory 74 in block 73 installation conditions Erasure.

At step S100, the unit 77 controls the erase operation calculates the start position and end position of the scan of the scanning distance and the scanning direction are installed and stored in block 73 installation conditions erasing, and provides the start position and end position of block 79 galvanoplasty. This means the cycle during which the block 79 galvanoplasty updates the values of the instructions for galvanostatically 53.

At step S110, the block 77 management operas is of erase calculates the time interval for moving the laser beam L only to a predetermined length in a short cycle, from a distance scanning and the scanning direction is stored in the block 73 installation conditions Erasure.

At step S120, the unit 77 controls the erase operation converts the output power of the laser is set and stored in block 73 installation conditions erase the current value and provides the current value for the block 79 galvanoplasty.

At step S130, the unit 77 controls the erase operation generates an instruction block 79 galvanoplasty and causes the mirror 52 galvanotherapy 50 to move in the initial position of the scan.

At step S140, the signal finalize erase state is "high".

At step S150, it is expected transition signal the beginning of the erase state "high". Step S150 is repeated to the time signal the beginning of the erase state is "high". If the signal of the beginning of the erase state is "high", the sequence goes to step S160.

At step S160, the active signal erase state is "high" and starts erasing. In addition, in this case, the signal finalize erase state is "low", as shown in step S170.

At step S180, the speed of movement of the rewritable label 101 is obtained using the unit to determine the speed of movement of the rewritable label 101, for example, the encoder 15.

At step S190, a determination is made whether the speed correction based on the obtained speed rewritable label 101. Whether the speed of adjustment is determined based on the magnitude of the error between the measured speed and the set speed. In particular, if the error is small and is less than a predetermined value, a decision is made that the error correction is not needed, and the error correction is not allowed. On the other hand, if the error is not less than a predetermined value, the implementation of error correction is allowed. Here, the calculation of the determination at step S190 may be exercised by the block 76 installation speed scanning unit 73 installation conditions erase or block 77 control the erase operation.

At step S190, if it is determined that the correction speed is not allowed, the sequence goes to step S200.

At step S200, the scanning speed is calculated using the obtained speed is actually moving rewritable label 101. Here, at step S200 according to Fig.6, the example shown, when the scanning speed is set to half speed rewritable label 101. These processing methods can be defined in different ways according to the intended use.

At step S10, block 76 setting the scanning speed sets the speed of scanning on the basis of the result of the calculation in step S190.

At step S220, the calculation of the correction of the laser power is carried out in accordance with the scanning speed, reset by the correction speed. The higher the scan rate, the smaller the distance of the scanning and irradiation time of the rewritable label 101 at the same width. Therefore, for a message of the same energy rewritable label 101 of the same width, it is necessary to increase the laser power. This calculation correction is performed at step S220.

At step S230, the laser power is set on the basis of the result of the calculation in step S220.

At step S240, the beginning of the erase is expected within the delay time of the beginning of the erase. However, the delay time of the beginning of the erase can be set equal to zero, and the delay time of the beginning of the erase, you can ensure as necessary.

At step S250, the unit 77 controls the erase operation instructs the block 79 galvanoplasty to start scanning, by sending instructions to the block 79 galvanoplasty, and simultaneously instructs the unit 78 controls the laser to activate the laser source 40 of light by sending instructions to the block 78 laser control.

At step S260, begins scanning laserna the beam L. According to figure 3, the scanning is performed with the set speed in the same direction as the direction of movement of the rewritable label 101.

At step S270, a determination is made, complete the scanning. The end of the scan is determined when the laser beam L reaches the end position of the scan, computed in step S100. The determination may be performed by block 79 galvanoplasty, which, in particular, manages galvanostatically 53. If it is determined that the scan is completed, the block 79 galvanoplasty notify unit 77 controls the erase operation on the completion of the scan, and the sequence goes to step S280.

At step S280, the unit 77 controls the erase operation instructs the unit 78 controls the laser off laser source 40 of light by sending instructions to the block 78 laser control.

At step S290, the active signal erase state is "low".

At step S300, a determination is made, have you changed any of the terms, for example, have you changed the rewritable label 101 to be erased. When there are changes to the terms, by the end of the sequence of processing operations, the sequence of processing operations is resumed from the beginning. On the other hand, in the absence of changes in conditions, the sequence of operations on which abode resumes from step S130.

Thus, according to the sequence of processing operations of the laser erase this option implemented, it is possible to properly adjust the scanning speed and to adjust other values, such as laser power, etc. in accordance with the correction scanning speed.

Here, determination is made whether the speed correction at step S190, but you can apply a sequence of processing operations, which are constantly correction, without providing the step S190.

In addition, if the block, which determines the speed of movement of the rewritable label 101, for example, the encoder 15, etc. are not provided, and the speed correction is not performed, excluding steps S180, S190, S220 and S230 and using the speed set on the conveyor belt 12 as the speed of movement of the label when calculating the scanning speed at the step S200, can similarly be put into practice way of laser erase this option implementation.

7 shows a diagram illustrating the staining and discoloration using media reversible thermal recording, which is used for the rewritable label 101.

The carrier of the reversible thermal recording is an organic substance with low molecular weight, including ina leucocrystal and reversible color developer (hereinafter referred to as "color developer"). Media reversible thermal recording makes transitions between a state before melting organic substances with low molecular weight and condition after melting and crystallization. In particular, the color tone reversibly transforms into a transparent state and condition of the painting under the influence of heat.

According to Fig.7, if the temperature of the recording layer, in the beginning in the state of A bleaching grows, leucocrystal and a color developer are melted and mixed with the melting temperature T2, which causes staining, and enter a state of B melting and coloring. If the recording layer is rapidly cooled from a state B to melt and staining, the record layer can be cooled to room temperature, remaining in a state of painting, and to enter the state C staining, where the coloring is stable and overiden. Is it possible to get C staining depends on the cooling rate. If the recording layer is cooled slowly, discoloration occurs during the cooling process, and the recording layer is in a state of A discoloration is the same as in the beginning, or in a state with a relatively lower density than in condition C staining, and it does so at fast cooling.

In particular, if the node 90 laser irradiates the recording medium reversible thermal recording laser, the output beam LW, the temperature of the irradiated area is growing, and the irradiated area goes from state A discoloration in state B melting and coloring. The laser beam LW node 90 laser writing beam type spot. Because the extraction is carried out in one pass, the laser beam LW moves that can lead to a condition in which the irradiated area is rapidly cooled. This leads to the possibility of transition from the state B to melt and staining with condition C staining.

In this case, if the temperature of the recording layer increases again during the transition from state C staining, discoloration occurs at a lower temperature T1 than the temperature of the staining (D in E). During the transition from this state, the temperature is reduced, the recording layer returns to the state of A discoloration is the same as in the beginning.

Condition C staining obtained by rapid cooling from the molten state, is a state in which leucocrystal and a color developer are mixed, giving the possibility of contact reactions between molecules, and many States are formed by solid state. In this state, the molten mixture of leucogranites and a color developer (which is painted with a mixture as described above) crystallizes and preserves the coloring. It is assumed that the formation of such structures which stabilizes staining. On the other hand, A state bleaching is a condition in which leucocrystal and a color developer are divided into phases. It is assumed that this state is a state in which molecules of at least one of the compounds are combined with education domain or crystallize, and in which leucocrystal and a color developer are separated and stabilized due to cohesion or crystallization. In many cases, therefore, leucocrystal and a color developer are divided into phases, and the color developer crystallizes resulting in a more complete discoloration.

In particular, if the device 80 laser erasing irradiates the medium reversible thermal recording laser beam L, as the temperature of the irradiated area is growing, the state can move from state C staining in state D, and E. Because the device 80 laser erasing slowly irradiates the medium reversible thermal recording vertically elongated linear laser beam L, the temperature increases gradually, and the state can move from state C colouring in state D, E in the state of A discoloration.

Here, if the temperature of the recording layer again rises to a temperature T3, which is not less than the melting temperature T2, may be weak erasing unable to provide the IC erasing, even if the recording layer is heated to a temperature of Erasure. The reason, apparently, is thermal decomposition of a color developer, making it difficult to combine or crystallization and difficult separation from leucogranites. In order to avoid deterioration of the carrier of the reversible thermal recording through repetition, the difference between the melting temperature T2 and the temperature T3 is reduced when heated media reversible thermal recording, which can prevent the deterioration of the carrier due to repetition.

According to the device 80 laser abrasion and laser erase this variant implementation, since the carrier of the reversible thermal recording is irradiated with a laser of sufficient time, and the media reversible thermal recording you can tell enough energy, you can achieve a sufficient effect erase.

According to the laser device erase one variant of implementation, the time of erasing can be time consuming, and erasing information display media reversible thermal recording can be achieved without stopping the conveyor.

According to the laser device erase one possible implementation, a substantial length of the scan may exceed the width of the carrier of the reversible thermal recording, which allows you to provide a sufficient dose of laser radiation.

With the device according to the laser erasing one variant of implementation, it is possible to reliably carry out the installation of the scanning speed of the laser beam, in accordance with various conditions Erasure.

According to the laser device erase one possible implementation, if the speed of movement of the carrier reversible thermal recording a few changes, you can set the proper scanning speed of the laser beam.

According to the laser device erase one possible implementation, if the high speed scan, the stored energy of the radiation may be permanent due to the increase of the laser power for the laser beam, and the energy input to the carrier of the reversible thermal recording can be made constant even if the scanning speed is changed, and the information display can always be washed in appropriate conditions.

Thus, according to the laser device erase embodiments of the present invention, the clock time can be reduced when the information display on the media reversible thermal recording is erased using a laser beam.

Embodiments of the present invention can be applied to the laser device erase, which erases the information displayed on the label attached to the shipping container, etc.

The present invention is not limited to E. what their options implementation but are subject to changes and modifications without leaving the scope of the present invention.

This application is based on Japanese priority patent application No. 2010-203707, filed September 10, 2010, the contents of which are fully incorporated into the present description by reference.

1. The laser device erase containing
a transfer unit for moving media reversible thermal recording containing information display, with a predetermined speed, and the carrier of the reversible thermal recording reversibly changes its color tone depending on temperature, and
block the laser erasing, made with the possibility of erasing the information display by irradiating the carrier of the reversible thermal recording laser beam during movement of the carrier reversible thermal recording and by deflection of the laser beam with a predetermined scanning speed that is lower than the predetermined speed in the same direction as the direction of movement of the carrier reversible thermal recording.

2. The laser device wipe according to claim 1,
in which the scanning distance of the laser beam exceeds the width of the carrier of the reversible thermal recording.

3. The laser device wipe according to claim 1,
in which block the laser erasing includes b is OK deviations, made with the possibility of deviation of the laser beam;
the AC excitation is performed with excitation unit variance;
unit speed setting made with the possibility of establishing a predetermined scanning speed of the laser beam on the basis of a predetermined speed of movement of the carrier reversible thermal recording.

4. The laser device wipe according to claim 3, additionally containing
unit of measure speed, is arranged to determine the speed of movement of the carrier reversible thermal recording when movement
moreover, the unit speed setting is made with the possibility of correcting a predetermined scanning speed based on the speed determined by the block determining the speed of movement.

5. The laser device wipe according to claim 4, further comprising
the setting unit of the laser power, made with the possibility of setting the laser power for the laser beam based on the corrected predetermined scanning speed.

6. The laser device wipe according to claim 2,
in which block the laser erasing includes block deviations made with the possibility of deviation of the laser beam,
the AC excitation is made with the possibility of excitation of unit variance,
the setting unit soon the tee, made with the possibility of establishing a predetermined scanning speed of the laser beam on the basis of a predetermined carrier speed reversible thermal recording.

7. The laser device wipe according to claim 6, further comprising
unit of measure speed, is arranged to determine the speed of movement of the carrier reversible thermal recording when movement
moreover, the unit speed setting is made with the possibility of correcting a predetermined scanning speed based on the speed determined by the block determining the speed of movement.

8. The laser device wipe according to claim 7, further comprising
the setting unit of the laser power, made with the possibility of setting the laser power for the laser beam based on the corrected predetermined scanning speed.

9. The laser erasing containing phases in which
move the carrier of the reversible thermal recording containing information display, with a predetermined speed, and the carrier of the reversible thermal recording reversibly changes its color tone depending on temperature, and
erase the information display by irradiating the carrier of the reversible thermal recording laser beam during movement of the carrier reversible Ter the systematic recording with a predetermined speed and by deflection of the laser beam with a predetermined scanning speed, lower than a predetermined speed in the same direction as the direction of movement of the carrier reversible thermal recording.

10. The method of erasing laser beam according to claim 9, further containing a phase in which
establish a predetermined scanning speed of the laser beam is lower than a predetermined speed of movement of the carrier reversible thermal recording.

11. The method of erasing laser beam of claim 10,
in which the distance of the scanning laser beam is larger than the width of the carrier of the reversible thermal recording.

12. The method of erasing laser beam of claim 10, further comprising stages, which
determine the speed of movement of the carrier reversible thermal recording the motion, and
adjust the predetermined scanning speed of the laser beam based on the determined speed of movement of the carrier reversible thermal recording.

13. The laser erasing indicated in paragraph 12
in which the laser power for the laser beam is set on the basis of the adjusted predetermined scanning speed.

14. The laser erasing in claim 11, further comprising stages, which are:
determine the speed of movement of the carrier reversible thermal recording the motion, and
adjust the predetermined speed is of generowania laser beam based on the determined speed of movement of the carrier reversible thermal recording.

15. The method of laser erased 14
in which the laser power for the laser beam is set on the basis of the adjusted predetermined scanning speed.



 

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