Digital multi-component motion sensor

FIELD: measurement equipment.

SUBSTANCE: digital multi-component motion sensor comprising a body, a recording unit, a sensitive element with motion sensors, connected into an electric circuit, differing by the fact that the elastic body of the sensor is made in the form of a monoblock from a composite material by winding of a tape of a thermoplastic material with further polymerisation of layers, with placement of deformation strain sensors in its layers, current-conducting elements and contact groups, mounted in layers of the body, the above monoblock of the body has the following structure of the layers differing according to performed functions within the body, counting from outside to inside, a protective layer, which protects elements of the sensor against environmental impact, a layer that levels thickness, comprising holes and grooves for protruding parts of the next layer, an instrumental layer comprising strain sensors, current-conducting elements and contact groups, a support layer that perceives load during writing of a handwritten text, an element of transfer of axial pressure of the writing unit is made in the form of a hollow rod with a writing unit installed in it and connected by the end with the sensitive element, made in the form of an elastic membrane jammed in the in the sensor's body, besides, the element of transfer of the axial movement of the writing unit is made in the form of a ball, contacting with a piezoelement, such as a piezoelement of direct effect of movements, besides, the axis of sensitivity of the piezoelement matches with the longitudinal axis of the sensor.

EFFECT: expansion of functional capabilities of a device due to selective measurement of static or smoothly changing movements along all directions of space with their subsequent digitisation, in particular, development of a small-size device in the form of a pen; rating of the movement of the writing unit during writing of a handwritten text for subsequent statistic treatment; obtaining higher reliability, since in solid multi-layer body the sensors are protected against unfavourable conditions of environment, besides, during manufacturing of the body an excessive quantity of sensors may be installed in its layers, which, whenever necessary, may be readjusted.

2 cl, 6 dwg

 

The invention relates to measurement techniques, in particular to a device for measuring deformations and displacements, and is intended to measure the static or smoothly varying displacements. In addition it can be used to measure the displacement of stylus recording and study of the manuscript texts.

Known to "Sound the pen to read the handwritten information" (SU # 460552 from 27.03.75 G06K 9/00), comprising a housing, which strengthened the emitter and writing site. Low accuracy of this device due to physical problems of the propagation of sound vibrations cannot be used to read the handwritten information.

Known Pen for inputting handwritten characters" (SU # 638988 from 28.12.78, G06K 9/00), comprising a housing holds a contributing rod, piezoelectric plates, arranged along the rod, the inertial elements to account for the acceleration of the movement of the device. The disadvantage of this device is that we remove the signal reflects the integral characteristics of the motion of the pen, but does not fix the peculiarities of handwriting, namely private characteristics of handwriting, including the pressure on the stylus of the node.

Closest to the claimed technical solution is the multi-sensor movements" (RU # 2422785 from 27.06 2011, G01L 1/04), which is provided with silopren the m element, made in the form of an elastic cylindrical rod, rigidly clamped in the inner groove of the sensor housing and the sensor element made in the form of two hollow cones connected by their bases with large diameter and a cylindrical ring and is cut by forming a number of elastic sections, with the first hollow cone rigidly fastened its small base with the housing and through the contact side of the outer conical surface with the inner conical surface of the collet is installed with the possibility of axial movement and fixed clamping sleeve, the second hollow cone, consisting of elastic sections with load cells installed in the areas of greatest strain, connected to the first hollow cone with a cylindrical ring, limiting the movement of the collet, each of the elastic sections is a dual beam, placed on the ring, caught with one hand in an internal groove of the housing and on the other hand, in contact with a cylindrical surface zyloprime element through restrictive snap rings. The disadvantage of these solutions is the complexity of the structural design, the complexity and duration of the calibration of the sensor and measurement, the impossibility of measuring axial movement.

The invention which is expanding the functionality of the device, due to the election, in all directions of space, measure the static or smoothly varying movements and their subsequent digitization.

The objective of the invention is solved in that the digital multi-component sensor movements performed in the following way: elastic sensor body is made in monoblock composite material by winding a tape of thermoplastic material with subsequent polymerization of the layers in the layers strain gages strain, the conductive elements and the set of contacts mounted in the layers of the hull, above the monoblock housing has the following structure of layers with different functions performed in the corps, counting from the outside in, a protective layer that protects the sensor elements from the external environment, equalizing the thickness of the layer containing holes and hollows under the protruding portion of the subsequent layer, instrument layer containing the load cell, the conductive elements and the contact group, the reference layer, perceiving the load when writing handwriting, the transmission element of the axial pressure of stylus is made in the form of a hollow rod with the installed tipped and connected to the side of the sensor element made in the form of an elastic membrane fixed in the sensor housing, and the transmission element axial PE is Emesene writing unit made in the form of a ball, in contact with the piezoelectric element, in which the used piezo direct effect of movements, and the axis of sensitivity of the piezoelectric element coincides with the longitudinal axis of the sensor, the protective layer of the shell may be made in the form of thin metal cover is bonded with a composite hull shell, limiting Flexural deformation of the body.

Figure 1 shows the sensor in section, figure 2 - elements of the body in layers in an enlarged view; figure 3 - scan the supporting layer of the composite shell casing at the location of the load cells; figure 4 - position of the sensor when writing text; figure 5 - scheme of distribution of loads when writing text; figure 6 is a structural and functional scheme of the device.

The sensor (1) includes a housing 1 of a multilayer structure made of composite material, with the cover 2, item 3 of the transfer of axial load, made in the form of a hollow cylindrical rod, placed in its internal cavity is a contributing node 4. Cover 2 is connected with the body thread. Sensitive element receiving the load when writing text, in this sensor design is elastically pliant sheath 5 of the housing 1, is equipped with load cells 6 arranged in the thickness between layers of composite structures in the zone of maximum bending deformations. Its function is optional for the purposes of the layers of the body perform different functions. When viewed sequentially from the top of the outer layer into the body, it can be limited to four layers. The outer layer 7, the thin, performs a protective function, protecting subsequent layers: leveling thickness 12 and the dash 8 that contains the load cell 6 radial displacements, conductive elements, the contact group from damage caused by excessive stress and the adverse effects of the external environment. This layer may be in the form of protective cover 9, in the form of a thin-walled cylindrical shell bonded with a composite hull. The next layer is equalizing the thickness of the layer 12, which in the construction of multilayer shell 1 is the technological element. It contains holes, recesses underneath the projecting elements of the underlying layer 8, protecting the elements of this layer from manufacturing defects in material specifications subsequent layers. Instrument layer 8 is a layer that performs the basic function of the sensor, it contains a load cell, conductive elements, the contact group and other elements. Made in the form of a chip on flexible polymer film 10 (Fig 3) it is attached to the support layer 11, the actual sensitive element of the sensor. The latter is a support layer 11, which is actually a sensitive element of the sensor, it determines the de is formazione properties of the sensor, because of its Flexural stresses in the writing of the manuscript text determine the sensitivity of the sensor, its reliability and stability of characteristics. When writing handwriting casing 1 sensor based at the point of contact of stylus 4 (a) (4), in place of the clamp body with fingers (B) and bearing housing of the sensor on the wrist (In). In the power circuit of the sensor (figure 5) his body is a cantilever beam cylindrical cross-section, loaded with hand writing site and fingers concentrated radial loads at the contact of stylus on the surface of a sheet of paper or other surface. When writing handwritten text transfer loads from the writing site on the thin elastic shell of the housing 1, which acts as a sensing element, occurs through the user's fingers holding the sensor housing (figure 4). Thin-walled sheath sensing element is elastically deformed, depending on the nature of the applied load, and therefore, each sensor 6, included in the power circuit housing, is loaded differently. For each direction of radial movement of stylus, with mounted enclosure of the load cell is collected by a separate measurement of the half-bridge, included in an electric circuit. For output conductors from the load cells in the body and the instrument is layer 8, containing the load cell, the conductive elements and the contact group, the internal cavity with the contact elements extends into the cavity of the cover 2 of the housing (not shown). Part of the epitaxial layer chip 10 may, for example, to enable communication with a separate system that allows automatic recording of measured displacements. For the separate measurement of the pressure of writing unit 4 in the axial direction, it introduced the piezosensor 13 axial movement, mounted in the bottom of the elastic membrane 14 fixed in the rear part of the housing 1. The piezoelectric element 13 is in the form of a disk of piezoelectric ceramics with electrodes on the ends of the disk [1, 2]. The electrodes of the piezosensor 13 are electrically connected to the input of the measuring circuit and mechanically through the hollow rod 3 and the ball 15 - sources of static and variable loads. When converting signal axial movement into electrical signals used method, the direct piezoelectric effect, when the signal of the displacement acts on the piezoelectric element and causes a change in the electrical signal at the output of the piezosensor. For this design the piezo sensor 13 pre-drawn in by means of the screw 16 and the spring 17, and the measured axial pressure of writing unit 4 is applied through the elastic membrane 14. The spring 17 with the screw 16 and the ball 15 is intended to create first the initial non-business efforts in contact with the piezoelectric element 13 of the sensor axial pressure. By screwing the adjusting screw 16 deflects the membrane 14 and generates a force proportional to the displacement of the screw 16 from this effort in the area of contact between the ball 15 and the piezoelectric element 13 there is a voltage proportional to pre-loading.

The device operates as follows. After Assembly into a single device is used for setting and measuring equipment and calibration of the load cells 6 bending stress and the piezosensor 13 axial pressure of writing unit 4. Individual calibration of each sensor direction eliminates measurement error due to a technological error in the manufacturing process of the composite body and the variances of the parameters and strain of the piezoelectric elements. Each channel measurements tarinoita individually. The piezosensor 13 is loaded by means of a screw 16 preliminary loading. When sharing the screwing of the screw 16 and the cover 2 of the housing axial load is transmitted through the ball 15 on the piezoelectric element and the diaphragm 14, a bending elastic membrane 14, its deflection is recorded by the registering device, the level of loading of the piezoelectric element 13 is determined by the compression spring 17. So fixed degree of pre-loading the sensor axial pressure writing site. The device in all directions radial movement is the same, therefore, will examine his work is in the direction of one siracusaviale axis (the plane of the drawing figure 5). When moving writing unit 4 of the sensor connected through contact with the plane of a sheet of paper or any smooth surface when writing free text, for example, in the vertical direction, the shell body 1 elastically bent, and the load cell 6, included in the power circuit of the shell and located in the zone of maximum bending deformations are deformed in different ways, depending on the location of the sensor on the generatrix of the shell support layer 11. The load cells 6 react to this bending resistance change and a corresponding change in the output voltage in the measuring diagonal of the half-bridge, which is registered by the device. When writing text, depending on the characteristics of the handwriting, the immersion of the load cells 6 Flexural deformation of the elastic body 11 and the piezosensor 13 axial pressure of writing unit causes the electrical signals at the input to the electrical circuit of the device. An electrical signal for each channel is amplified in multi-channel tensopril 18 "Topaz-3(4)" and goes to the input of the filter 19, which suppresses high-frequency noise. The electrical signal from the output of the filter is input to an analog-to-digital Converter (ADC) 20, which digitizes the useful signal with the required resolution in time. The digitized signal of the village who shall serve on microcontrol-ler and forth through the Converter interface (UART/RS-485) 22 PC 23 to create an array of data in digital form for further processing.

The technical feasibility of the invention. For the manufacture of the sensor housing with included in its design sensors, conductive elements, the contact group, made in the form of flexible circuits, use the following process [3]. In operations of this process spiral winding on the mandrel strips of polymeric material is made of the supporting layer 11 of the housing. For example, a band width of 40 mm and a thickness of 0.30 mm of polyester fabric pre-impregnated with the calender, the rolls of which are heated to a temperature of 130°C thermoplastic polymeric material is a suspension polyvinyl chloride according to GOST 14332-78. Before impregnation polyvinyl chloride is heated to a temperature of 120°C and mixed with 3% of dioctylphthalate according to GOST 8729-88 and 0.5% of barium stearate brand C-17 TU 6-09-4803-79. The polymeric material is heated and after passing the tape under the pressure roller is welding the adjacent contacting turns of tape. Welding lead with the following parameters - frequency ultrasonic vibrations 23 kHz, the power - 120 watts. After winding and curing the supporting layer 11 of the housing, providing the necessary strength and rigidity manually laying thermoplastic film 10 [4], which contains the load cell 6, the conductive elements and the contact group attached to one surface of the film 10 made in the form of flexible circuits and equalizing the thickness of the layer 12. Equalizing the thickness of the layer 12 covers the flexible film 10 around the chip containing the load cell, the conductive elements and the contact elements. The layer containing the electronic components may include integrated circuits such as microprocessors or microcontrollers, coils, batteries, and other film Thickness, containing electronic components, reaches 30-50 μm. After polymerization of the obtained multi-layer composite tube billet housing that contains the necessary instrument components, minorityserving in the layer of the shell. After the housing is removed from the mandrel and processed by turning. The inner cavity of the housing insert a rod with a contributing site, and the case is placed in a protective case that has a lid. The proposed solution has a number of advantages, providing a positive effect:

- allows you to create small-sized device in the form of a pen;

- you can take the characteristics of the movement of stylus when writing handwriting for subsequent statistical processing;

compared with the prototype has more reliability, as in the monolithic multilayer body sensors are protected from the adverse. environmental conditions, in addition, when manufacturing the casing in its layers can be placed esbatech the th number of sensors, which, optionally, can be rebuilt.

Thus, in extending the functionality of the device through the election, in all directions of space, measuring the displacement of stylus with subsequent digitization specifically expressed positive effect of the proposed device.

Sources of information

1. Fesenko Mrs x and other New piezoelectric materials. Rostov - on-don: publishing house. Rostov state University, 1983. - p.18.

2. Piezoelectric transducer (RU # 2189668 from 20.09.2002 H01L 41/08).

3. Method of making curved parts of thermoplastic composite material (RU # 2431566 from 20.10.2011 B29C 70/50).

4. Laminating film with an embedded microchip (RU # 2429975 from 27.09.2011 B32B 27/04, C08J 5/12, H01L 21/70).

1. Multicomponent digital motion sensor, comprising a housing, a contributing site, the sensing element with displacement sensors included in an electric circuit, characterized in that the elastic body of the sensor is made in monoblock composite material by winding a tape of thermoplastic material with subsequent polymerization of the layers in the layers strain gages strain, the conductive elements and the set of contacts mounted in the layers of the hull, above the monoblock housing has the following structure of layers distinguished by fu is the capabilities in the corps, counting from the outside in, a protective layer that protects the sensor elements from the external environment, equalizing the thickness of the layer containing holes and hollows under the protruding portion of the subsequent layer, instrument layer containing the load cell, the conductive elements and the contact group, the reference layer, perceiving the load when writing handwriting, the transmission element of the axial pressure of stylus is made in the form of a hollow rod with the installed tipped and connected to the side of the sensor element made in the form of an elastic membrane fixed in the sensor housing, and the transmission element axial movement of the writing unit is designed in the form of a ball in contact with a piezoelectric element, which is used piezo direct effect of movements, and the axis of sensitivity of the piezoelectric element coincides with the longitudinal axis of the sensor.

2. The sensor according to claim 1, characterized in that the protective layer of the case is made in the form of thin metal cover is bonded with a composite hull shell and limiting Flexural deformation of the casing.



 

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