Method of optical recording and a device using this method

 

The invention relates to information recording media for optical recording. The way to establish the optimal values of the parameter record includes the record of a series of test patterns, picking patterns for forming respective parts of the signal read, the receive parameter values read from each part of the signal reading, the choice of the optimum value of the write parameter in dependence on a preset value of the derivative of the function describing the dependence of the parameter read from the parameter record, recorded on the specified media. A device for recording information on the medium for optical recording contains a radiation source, depending on the controlled parameter record for recording information on the medium, a control unit for recording a series of test patterns, the block reader for reading the template and generating the appropriate signals are read, the first and second processors. The block reader configured to read the above preset values with the mentioned media, optical recording and is associated with the second processor for transmitting the above-mentioned preset value devices and media. 2 c. and 9 C.p. f-crystals, 9 Il.

The invention relates to a method of recording information on the medium for optical recording with the radiation beam. The method used to establish the optimum value of the write parameter and contains the first stage of recording a series of test patterns on the recording media, each of them has a different value of the write parameter, the second stage reading of templates for generating corresponding signals read a third stage for receiving parameter values read from each of the signal reading, and values form the functional dependence of the parameter read from the write parameter, and the fourth stage of choosing the optimal value of the write parameter in dependence on the preset values of the derivative function. The invention also relates to a device for recording information on the medium for optical recording containing a radiation source for producing a beam of radiation based on the controlled value of the parameter record for recording information on the medium, a control unit for recording a series of test patterns, each of which has a different parameter value write, block read on the values of the parameter read from each of the signal reading and values form the functional dependence of the parameter read from the parameter record, operatively associated with the second processor to obtain the optimum value of the write parameter in dependence on the preset values of the derivative function.

The method and apparatus, in accordance with the first paragraph, known from patent Application European EP AND 0737962. The device uses a method for establishing an optimum power of the recording beam of radiation, having the following stages. First, the device writes a series of test patterns on the medium, each pattern with increasing power entry. Then it produces the modulation of each pattern from the signal readout corresponding to the template. The device calculates the derivative of the modulation as a function of the recording power and normalizes derived by multiplying it on the recording power during modulation. The point of intersection of the normalized derivative with a preset value determines the power level entries, suitable for recording on the media. This procedure for setting the optimum recording power takes into account various features of the medium by measuring the modulation of the test patterns recorded NY, used in the procedure. The derivative is not sensitive to the device parameters such as numerical aperture objective lens for focusing the beam on the medium, the intensity distribution within the beam and the spot size formed by the radiation beam. These characteristics of the method are created to provide a suitable setting of the recording power for each combination of the recording device and the recording media.

However, in experiments it was found that the known method does not receive the appropriate level of power to account for all combinations of device and media.

The first task, laid the basis of the invention is to provide a method which gives a suitable power level record regardless of the devices and media that are used. The second objective, on the basis of the invention is to provide an optical recording device, adapted for use of this method.

The first task is solved in accordance with the invention by means of optical recording, as described in the first paragraph, characterized by the fact that the fourth stage involves reading the preset values with the recording media. Nepoch the preset threshold level from media properties, on which you are recording. Although it was assumed that all the properties of the media signals are read from the test patterns, it was found that the derivative used in order not to be dependent on the properties of the device, is dependent on the properties of the media. It was found that the compatibility between devices and media in relation to the determination of the optimum level parameter recording using the above-mentioned method with the derivative can be achieved only when a predefined value of the derivative is recorded on the media. Preset value preferably is written by the manufacturer of the recording medium. The user of the recording medium can record a preset value after performing sufficient tests on the media.

Recorded pre-set value is preferably preset value of the normalized derivative. The derivative is normalized by multiplying it by the ratio of the write parameter to the parameter reading. While the use of derivative makes the method insensitive to offsets that are present in the device the device. On such large-scale factors can influence the efficiency with which the optical system in the device can generate a signal read from the series marks the recording media and a valid signal amplification reading.

Derived and normalized derivative of a function can be defined in different ways. It is possible to define derived using known numerical methods, for example, by taking the difference between the values read between the values of the parameter recording and calculation of their relationship or with the help of the so-called Lagrange formula or n-point method. Since numerical methods amplify the noise present in the measured quantities, the derivative is preferably determined analytically from the function obtained by approximating the curve parameter values read values write.

When the feature is available in analytical form, there is no need to calculate the derivative, and the optimal value of the write parameter can be determined directly from the function and pre-set value.

In a specific embodiment of the method in accordance with the invention, the write parameter represents agnosti for the quality of the resulting record labels. For other recording options can also be set to an optimal value by reference to a pre-set value of the derivative recorded on the recording medium, for example for power erase entry, power offset, the length of the first, intermediate and last pulses of the series of pulses used for recording marks on the media, and cycles of these pulses. If, for example, a series of test patterns made with different duty cycle pulse recording method makes it possible to set the optimum duty cycle.

In a specific embodiment of the method parameter reading is the modulation amplitude of the signal read output from the information recorded on the media. Modulation can be easily obtained from the signal read, and it is a suitable parameter to optimize recording parameters. Other suitable parameters read are a reflection of the media in its parts with the record and without an appointment and the number of errors in information provided from a series of specific test templates or from a series of test patterns containing random data, where errors may be defined as errors in bits or error, in bytes.

Deuteronomy is the first paragraph, characterized in that the device contains the block reader for reading the preset values from the media, and the fact that the output of block read is associated with the second processor for transmitting the pre-set value.

The objectives, features and advantages of the invention will be apparent from the following more detailed description of the preferred variants of the invention as illustrated in the accompanying drawings.

Fig.1 is a diagram of a device for optical recording according to the invention.

Fig. 2 illustrates the two parts of the signal read from the two test patterns.

Fig. 3 is a graph showing the measured modulation as a function of the recording power and its derivative.

Fig.4 shows the recording media according to the invention.

Fig.5 is a top view of the recording media.

Fig.6 is a top view of the template tags on the media.

Fig. 1 shows the device and the carrier 1 for the optical recording 1 in accordance with the invention. The carrier 1 has a transparent substrate 2 and a layer 3 for the record.

Layer for recording contains material suitable for recording information with the aid of the m variable phase material type dye or other suitable material. Information can be written in the form of optically detectable areas, also called labels, layer 3 for recording. The device comprises a radiation source 4, for example a semiconductor laser, for emitting a beam 5 of the radiation. The radiation beam is applied to layer 3 for recording through the beam splitter 6 beam, the objective lens 7 and the substrate 2. The media may also come into contact with air, when the beam falls directly on the layer 3 to record without passing through the substrate. Radiation reflected from the medium 1, is passed through the objective lens 7 and after passing through the beam splitter 6 beam falls on the detector system 8, which converts the incident radiation into electrical signals of the detector. Detector signals are input to scheme 9. The circuit provides a number of signals from the detector signals, such as signal reading Sfrepresenting the information read from the medium 1. The radiation source 4, a beam splitter 6, an objective lens 7, the detection system 8 and scheme 9 together form a block read 10'. The signal read from the circuit 9 is processed in the first processor 10 to receive signals, represents the received signals are sent to the second CPU 11, which processes a series of values read, and based on them gives a value for signal power control record. The signal power control record associated with the control block 12. Information signal 13 representing the information recorded on the medium 1, is also fed to the control block 12.

The output unit 12 of the control associated with the radiation source 4. The label on the layer 3 for recording can be recorded using a single pulse of radiation, the power of which is determined by the optimum level of recording power, which is calculated by the CPU 11. The label can also be written using a series of pulses of equal or different duration and one or more power levels determined by the signal-power entry. Under the processor refers to any device suitable for performing calculations, such as a microprocessor, digital signal processor, rigidly mounted analog circuit or programmable in operating conditions of the scheme.

The real power of the radiation emitted by the radiation source 4 can be measured not shown in the drawing, the detector located at the other unused side lobe beam izluciaet to be connected directly to the processor 11. On the other hand, the signal may be associated with the control block 12, where it can be combined with a peak amplitude of a signal read for the formation of the criterion of the radiation power received at the layer 3 for recording, and the subsequent introduction in the processor 11.

Before recording information on the medium 1, the device leads the capacity of its records to the optimal value by implementing the following procedure. First, the device writes a series of test patterns on the medium 1. Test templates should be selected so as to give the desired signal reading. If the reading obtained from the signal read, has a maximum modulated part of the signal read relating to the test pattern, the test pattern must be long enough labels for maximum modulation part of the signal read. When information is encoded in accordance with the so-called modulation (eight to fourteen" (FM), test patterns preferably contain long Iutags modulation schemes. Each of the test patterns recorded with different recording power. The power range can be selected on the basis of indicative of the power level recorded as controls under the control of the CPU 11. Templates can be written anywhere in the media. They can also be written in specifically created test areas on the media.

Fig. 2 shows the parts 18 and 19 of the signal read generated from two templates, recorded at two different power levels of the recording. Shows the templates contain short tag long mark and a short mark, as shown by the parts 15, 16 and 17 of the signal, respectively, as in part 18 of the signal read, and in part 19 of the signal read. The actual template can contain several hundred different labels or equal to length.

The CPU 10 calculates from the signal reading SRparameter reading, which is used for determining the optimal recording power. Possible parameter reading is the ratio of the smallest amplitude parts of the signal read for the part of the signal read 13, designated as "a" in Fig.2, and the maximum amplitude of the same part of the signal read, marked as "b". The preferred setting of the read is the normalized modulation, which is a ratio of a maximum distance from peak to peak signal is read, marked as "C", and the maximum amplitude of "b" part of the signal scodelario template and power records this pattern was recorded. Different recording power can be taken from the value of the control signal recording power in recording the test patterns or measurement of the radiation power. Fig.3 shows schematically the processing result signal reading obtained from the test patterns; each x represents a pair of values for the modulation m and the recording power P of the test pattern; together crosses form the function according to the modulation m of the power entry & CPU 11 performs the approximation curve through the measured values of the modulation in order to obtain an analytical expression for the change of the modulation as a function of power records. The curve indicated in Fig.3 with a dashed line. The approximation can be done using the well known method of least squares. The fitted curve is described by the function m(P). As the next step, the CPU 11 calculates analytically the normalized derivative of the function m(R) with respect to the power of the record R. the normalized derivative of g(P) is equal to the function (dm/dP)P/m. The function g obtained from the approximated modulation m in Fig.3, shown with curve drawn.

Then, the controller outputs the intermediate power g0media and defines the value of the recording power P, belonging to a pre-set value, as shown by dotted lines in the lower half of Fig.3. The value of g0may be the value established by the manufacturer of the recording media stored on it. As the next step, the intermediate value of the power Piis multiplied by the constant h is greater than one, the result is an optimum level of recording power Pabout.

Values preset value g0and constants multiplying h are determined by the manufacturer of the carrier or by the user during initialization of the carrier and storage of information. The value of g0is set within the range from 0.2 to 5.0. For values higher than 5.0, the normalized derivative loses its predicted value, because the proximity of the asymptotes may cause the value of R, referred to g0that lie close to each other on the axis of the power account. The increase in the measurement error of the derivative is another reason to avoid values of g0larger than 5.0. For values of g0smaller than 0.2, the normalized derivative has a slight tilt, due to which small errors in the value is represented with multiple entry having the CD format, given the value of g0in the range from 0.5 to 2.0, and for media with a higher density in the range from 2.0 to 4.0. The constant multiplying h is set preferably within a range from 1.00 to 1.35 and also recorded on the media. For optimal recording power poequal (hPi), in General, is set to close the recording power when the modulation m gets filled. Optimal power and erasing of information can be obtained from the optimal recording power by taking the optimal power data erasing Peequal (kPo), with a constant multiplication k. The constant k can be written to the carrier is preferably within a range from 0.40 to 0.66.

In the preferred method of establishing g0and h is the optimal capacity of the record carrier is determined by finding the power account, which gives the smallest fluctuation of the signal read from the information recorded on the media. Information is preferably random information. Next, the normalized derivative dm/dP(P/m) is determined from the recorded series of test patterns, as described above. For g0select the value that lies within the above-described DNA Piis determined by the normalized derivative. The value of h is now equal to R0/Pi. These values of g0and h can be written on all carriers of the same type, i.e., produced using the same production process, for use in all recording devices. In General, various types of media, such as media from different manufacturers, have different recorded values of g0and, if necessary, various recorded values of h. If the particular use value of h is fixed and is not recorded on the media, recordable value of g0must be chosen such that the value associated with Pimultiplied by a fixed value of h, led to the optimum recording power Pabout.

It turns out that the value of the normalized derivative is hardly affected by the changes of parameters of the recording device. If the optimum level of recording power is selected depending on the normalized derivative, the selected level is appropriate for reliable recording in a large number of carriers for the account using different capture devices. The power level records may be selected by taking the power level of the corresponding prior is th can also be achieved, when there is a curve. In that case, the derivative can be determined from the dependence of the parameter read from the data power level entry, for example, by calculating a difference between the measured values. However, the exclusion stage approximation of the curve will increase the noise in the values of the derivative, thereby interfering with the use of the derivative to establish the optimal power accounts for some carriers.

Function defined over pairs of values (m,R), can represent one or more polynomials, which is preferably orthogonal. The curve can then be written asThe normalized derivative presented in analytical formwhere f'(P) represents the derivative of the function f with respect to the parameter P. the Value of PLcan be found from the equation g(Pi)=g0(3) depending on the choice of the curve, which is the approximation, the value of Pican be found in the form of analytical expressions or as a result of using the numerical method of successive approximation of the root, such as as a method of regular errors or Newton's method. Use the and as a consistent approximation can lead to undesirable root of the equation. When can be found in the analytical form of equation (3), it is no longer necessary to determine the normalized derivative of g, but the pre-set value g0can be put directly in equation (3) to determine the associated values of Pi.

Suitable near orthogonal polynomials f are the Legendre polynomials. Four Legendre polynomial of lower order are defined like this:Since these polynomials are defined in the interval -1<R<+1, and the power account is taken in the range from Pminto Pmaxwe select the values of the recording power must be scaled in accordance with the formula
The scaled power levels record Psnow should be used in the formulas of equation (4). P-valueifound from equation (3) must be scaled back to range from Pminup to Rmax.

When using a digital processor input values m and P must be converted from an analog value into a digital value by analog-to-digital Converter. The number of bits of the digital output values can be made to fit noise in ICRA, the inverter must be at least 8 bits depth, thereby introducing additional 1/28=1/256 noise.

If the CPU 11, which performs the above calculations, is a small processor because of the cost calculation, it is preferable to carry out in General format. The values of m and R must therefore be converted to real values to integer values. The constant multiplication for this transformation must be large enough in order not to introduce additional noise, and small enough not to require too much computing power. A good principle is this choice of constants, so that the noise present in the value of m or P, as determined in view of the size was slightly larger than the value corresponding to the smallest meaningful bat in a General view. The noise value includes the above-mentioned quantization noise. If, for example, the noise values of m is 0.5% of the maximum value t, the multiplication factor of about 1000, divided by the maximum value is reliable.

Instead of using the number of polynomials for the approximation of values of m and P can also be used part of the ditch, values which must be determined by using a curve approximation. The function must have parameters for the value function for small values of P, the derivative of the function at intermediate values of P and for the value functions for large values of R. a Suitable function is

The normalized derivative can be obtained in an analytical form. Equation (4) then reduces to a quadratic equation, allowing you to find the root without successive approximation.

Other suitable functions are the inverse tangent and hyperbolic tangent:
f(P) = a0arctan(a1P-a2) (7)
f(P) = a0tanh(a1P-a2) (8)
The value of the arc tangent and hyperbolic tangent can be stored in a table to which a call is made in the course of the program, to speed up calculations.

Fig. 4A shows the recording media in the form of a disc in accordance with the invention. The recording media has a continuous track 109 that is used for recording, the coils of which are arranged in a spiral. The coils can also be arranged concentrically instead be placed in a spiral. Track location 109 on the recording media is marked by servicable, sledovat the track 109 during a scan. On the other hand, servicable may, for example, consist of separate parts is uniformly distributed patterns that lead to periodic generation of the tracking signals in the servo system. Fig.4b shows the section along line b-b of the medium 1 for recording, in which the substrate 2 is covered with a layer 3 and layer 107, and shows the cross-section of the three grooves 104. Pre-marked groove 104 may also be formed as rising part of the substrate or a material having a property different from its surroundings. The recording layer 3 can be applied optical or magneto-optical method using the recording device. Information on the recording media represented using template tags. Information is recorded on the track 109 using the writing process, in which each mark is formed by using one or more recording pulses of constant or changing a recording power according to, for example, the length of the label. Recording settings the recording process, such as the recording power, the number of pulses, the change and the duty cycle shall be chosen on the recording media, in particular to the material properties of the recording media. An example of recordable media therego use. Extended description recordable CD system, which provides information in a similar way, can be found in US 4901300 (PHN 12.398) and US 5187699 (PHQ 88.032). Description read CD and use part of the pre-marked groove can be found in the book "Principles of optical disc systems" Bouwhuis, etc., ISBN 0-85274-785-3.

Each of figs.4C and 4d shows a magnified section 102 of the carrier 1 containing a specific embodiment of the track having a periodic modulation (sweep). This swing causes the reading device of serotesting an additional signal. Swing is, for example, frequency-modulated with an auxiliary signal, and information is encoded in the auxiliary signal. Description of the recording media, having this information recorded on the track, can be found in EP AND 0397238. Pre-marked groove is very suitable for recording control information indicating the recording process. Media for the recording of various types, such as, for example, optical tape, can be supplied with control information in various ways, for example by placing the control area at the beginning of the film, or along more tracks.

When in varicella spaced grooves has a frequency of 22.05 kHz, modulated with a frequency deviation at 1 kHz. After FM demodulation and conversion to digital form occurs bit stream having a bit rate 3150 bits/s bit Stream is divided into data blocks, each of which consists of 42 bits, each data block contains 4 bits sync, 24 information bits and 14 bits to repair schirok, in that order. The contents of the information accumulated in the data block depending on the block position data in the bit stream. In the group of ten data blocks nine consecutive data blocks contain timecode called ATIP (absolute time in pre-marked groove) used as an address to access the user information to the media. The tenth block of data from a group of ten blocks of data contains control information. Three consecutive control information block data divided by nine data blocks temporary codes that contain an indicative value for the power Pithe value of the multiplication factor h, the value of the normalized derivative of g0and the value of the constant multiplication k. Data blocks containing control information, preferably located before the area used for recording Eisele medium 1 for recording, equipped with a track 30. A path may be a circular or spiral, for example, in the form of a relief groove or protrusion. The area of the carrier is divided into a region 31 of the recording information for recording information of the user and the control area 32 for storing information relating to the recording, reading and erasing information on a medium that is mostly not used for recording user information. The control region 32 dotted curve. Region 31 of the record information such that undergoes a change in its optical detective property when exposed to radiation over a specific power level of the recording. The value of g0can be stored as a template control information in the control area 32 of the carrier. When the control area is clearly marked, the manufacturer of the carrier must record the value. On the other hand, the user can write the value on the media, for example, during initialization of the media, giving the opportunity to write a value to a particular disk. The values of h and k can also be written like the value of g0. Fig.6 shows a greatly enlarged portion of the track 33, containing the template 34 labels, in which the encoded control information.


Claims

1. A method of setting the optimum value of the write parameter in the device for optical recording for recording information on the medium for optical recording by using a radiation beam, comprising the first stage of recording a series of test patterns on the recording medium, each pattern has a different value of the write parameter, the second stage reading of the templates for the formation of the relevant parts of the signal read, the third stage of obtaining the parameter values read from each part of the signal read, and values form the functional dependence of the parameter read from the parameter record and the fourth stage of choosing the optimal value of the write parameter in dependence on the preset values of the derivative function, characterizing the dependence of the parameter read aerizuwae dependence parameter read parameter write record on the specified carrier, and the fourth stage involves reading the preset values with the recording media.

2. The method according to p. 1. where a derivative is a normalized derivative.

3. The method according to p. 1 or 2, in which the fourth stage includes an additional stage of determining the derivative of the function describing the functional dependence of the parameter read from the write parameter, and determining the intersection of the specified derivative with a pre-set level.

4. The method according to p. 1, in which the third stage includes a shaping function that defines the ratio between read and write parameter by fitting a curve of values of the parameter read and write parameter.

5. The method according to p. 1, where the entry parameter is the value of the power level of the write beam of radiation.

6. The method according to p. 1, in which the parameter reading is a modulation of the amplitude of the signal read generated from information recorded on the media.

7. A device for recording information on the medium for optical recording containing a radiation source for emitting radiation beam depending on a managed magnitude of the ISI series of test patterns, each of which has a different value of the write parameter, the block reader for reading the template and generating the appropriate signals read to the first processor, designed to retrieve the parameter values read from each of the signal reading and the formation of a functional dependence of the parameter read from the parameter record, the second processor associated with the first processor and designed to obtain the optimum value of the write parameter in dependence on a preset value of the derivative of the function describing the functional dependence of the parameter read from the parameter record, and connected with the control unit for signal transmission power control records indicating the obtained optimum value of the write parameter, characterized in that the block reads done with reading the above preset values mentioned optical media write, and block read is associated with the second processor for transmitting the above-mentioned preset value.

8. The device according to p. 7, in which the second processor is configured to derive the derived punkspeacinia derived and pre-set value read from the recording media to obtain the optimum value of the write parameter.

9. The device according to p. 7, in which the derivative is normalized derivative.

10. The device according to p. 7, where the entry parameter is a power level of the write beam of radiation.

11. The device according to p. 7, in which the parameter reading represents the amplitude of the signal read.

 

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