JP2007141294A - Optical disk controller and optical disk control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk controller and an optical disk control method which enable elimination of accumulation of errors in LS drawing processing, and high quality and high-speed LS drawing processing. <P>SOLUTION: In the optical disk controller and the optical disk control method, elimination of error accumulation in the LS drawing processing becomes possible and high quality and high-speed LS drawing processing is attained by detecting a positional displacement in drawing by comparing a synchronization signal acquired from an optical disk corresponding to the drawing processing of LS, with a reference counter which can count time intervals at fixed timing without being influenced by disturbance etc. and performing the optical disk rotation control or compensation processing to drawing data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc control apparatus and an optical disc control method for recording digital information on a disc-shaped recording medium and printing and recording the print information on a disc-shaped printing medium.

  With the progress of the IT industry in recent years, the spread of disc-shaped recording media such as optical discs that record large-capacity multimedia information is remarkable, and various disc-shaped recordings such as CD-R, CD-RW, and DVD-R are currently available. Medium is widely and commonly used on a daily basis. These disc-shaped recording media have a recording layer that causes a change in shape that can be optically read out as digital information from one main surface side by a pulsed light beam received from one main surface side. With the widespread use of these disc-shaped recording media, information recording apparatuses that record digital information on these disc-shaped recording media have become popular.

  On the other hand, with the progress of optical disc recording technology, discs and information recording apparatuses having a function of drawing not only digital information but also visible information such as pictures and characters on a disc-shaped recording medium are becoming widespread. Patent document 1 is mentioned as one of such techniques. In Patent Document 1, visual information drawing processing is performed by performing laser irradiation corresponding to image data on the other main surface side different from the recording surface of the optical disc.

  One method of drawing visual information on an optical disc is Light Scribing (hereinafter abbreviated as LS). The LS repeats the drawing process for each predetermined radial position on the optical disk having a heat-sensitive surface capable of drawing visual information by laser irradiation, and repeats the drawing process for each predetermined radial position, thereby drawing the concentric circles. To draw visual information on the optical disc. In many cases, the LS is commonly used as a conventional optical disc information recording apparatus and has an LS drawing function. Such an information recording apparatus does not require a separate visual information drawing apparatus. Attention has been paid.

FIG. 15 is a block diagram showing a configuration of a conventional optical disc control apparatus that realizes LS drawing processing.
In FIG. 15, an optical disk 101 is an optical disk corresponding to the LS drawing process. Optical information can be formed on the optical disc 101 by a thermal change caused by laser irradiation. Also, physical information indicating certain angle information is embedded in the inner periphery of the disc.

  The optical disc control apparatus 200 is an optical disc control apparatus capable of performing LS drawing processing. Each part of the optical disc control apparatus 200 will be described below.

  The spindle motor 201 rotates the optical disc 101. Further, the angle information of the optical disc 101 is read by, for example, laser irradiation, and a signal for notifying a certain angle passage timing while the optical disc 101 is rotating is generated.

  The servo control unit 202 controls the rotation of the spindle motor 201 and the radial position of the laser irradiation unit 206.

  The drawing data generation unit 203 converts the data received from the host 301 into data that is actually drawn by a laser. Here, as a method of synchronizing the frequency P of the received data with the frequency Q of the drawing data that is the actual write data, it is realized by a method of expanding the received data by Q / P times.

  The CPU 204 realizes LS drawing processing by controlling each block of the optical disc control apparatus 200 by software.

  The LDD unit 205 converts the write data into a signal for ON / OFF control of laser irradiation.

  The laser irradiation unit 206 irradiates the optical disc 101 with a laser based on the signal sent from the LDD unit 205.

  The writing strategy unit 207 converts the drawing data generated by the drawing data generation unit 203 into a laser pattern for drawing with high quality.

  The BCU / DMA unit 208 arbitrates access to the data storage unit 209, writes the drawing data generated by the drawing data generation unit 203, the write strategy unit 207, the LDD unit 205, the laser irradiation unit 206, the data storage unit 209, and Transfer to the servo control unit 202.

  The data storage unit 209 temporarily stores received data, drawing data, and the like, and uses a DRAM or the like.

  The host data control unit 210 performs control for receiving data used in the drawing process from the host 301.

  The host 301 transmits data for drawing LS to the optical disc control apparatus 200, and is, for example, a PC or a DVD recorder.

Next, the operation will be described.
First, received data is read from the host 301 by the host data control unit 210, and drawing data is generated by the drawing data generation unit 203. The drawing data generated by the drawing data generation unit 203 is converted into a laser pattern by the writing strategy unit 207, and the optical disc 101 is irradiated by the laser irradiation unit 206 based on a signal sent from the LDD unit 205. At this time, the servo control unit 202 controls the spindle motor 201 to rotate the optical disc 101 at a constant rotational speed, and visual information drawing processing is performed on the concentric circles of the optical disc 101 at every regular radial position.
JP 2003-203348 A

  The drawing process in the LS is realized by performing the drawing process of visual information for each radial position at a constant interval on a concentric circle as described above. For this reason, when drawing processing for a certain radial position ends, overhead such as movement processing to the drawing position and wait processing to the drawing start position occurs before the drawing processing to the next radial position starts. Since this overhead processing occurs for each drawing processing unit, it occupies a certain ratio in the time required for the LS drawing processing. One means for realizing the LS high-speed drawing process is a means for increasing the disk rotation method. Although this means can reduce the time required for the drawing processing unit, as described above. The overhead between drawing processes cannot be shortened. Therefore, there is a limit to speeding up the LS drawing process only by increasing the disk rotation speed. As described above, it is indispensable to reduce or eliminate the overhead between the drawing processes in order to realize the LS high-speed drawing process.

  As a means for eliminating the overhead between the drawing processes in order to realize the LS high-speed drawing process, a method of drawing the LS drawing process from the conventional concentric circle shape to the spiral shape can be considered. Since the drawing process for each radial position in the concentric drawing process is continuously performed by the spiral drawing process, the movement process in the radial direction between the drawing processes and the wait process up to the drawing start position are not necessary. Time can be completely eliminated. As described above, the spiral drawing process is the most important technique for realizing the LS high-speed drawing process. However, the spiral drawing process has been difficult to realize because the high-quality drawing process is impossible with the conventional technique for two reasons.

  The first reason is that misalignment of the drawing process is accumulated, so that it is difficult to correctly perform the drawing process at the target drawing position. An optical disk compatible with LS has a feature that a mechanism for highly accurately synchronizing recording positions such as wobble embedded in an optical disk for recording information such as a DVD-R is not provided. Therefore, in the LS drawing process, it is difficult to synchronize the drawing position with high accuracy, and when an error occurs in the rotation control with respect to the optical disc, it is difficult to correct the deviation. In this conventional concentric drawing process, the position resynchronization is performed each time the drawing process is started for each radial position, so that the drawing position deviation amount is not accumulated, and the influence on the drawing quality is small. However, when the spiral drawing process is performed, the resynchronization process such as the concentric drawing process is eliminated, so that the drawing position shift amount is accumulated and the influence on the drawing quality is increased.

  The second reason is that the drawing locus is different between the spiral drawing process and the concentric drawing process, and thus it is impossible to perform the drawing process at the correct position. Since the visual information used for the LS drawing process is premised on recording concentric circles, when the drawing process is performed spirally, a shift in the radial direction occurs. Therefore, it is impossible to record at the correct position, which adversely affects the drawing quality.

  The present invention has been made to solve the above-described conventional problems, and an optical disc control apparatus capable of performing drawing processing at a target drawing position while eliminating overhead between drawing processing in LS, and An object is to obtain an optical disc control method.

  An optical disk control apparatus according to claim 1 of the present invention is an optical disk control apparatus that performs visual information drawing processing on an optical disk capable of drawing visual information by laser irradiation, and a laser irradiation means that performs laser irradiation on the optical disk. , Using drawing data generated from the outside, drawing data generating means for generating drawing data, servo control means for controlling rotation of the optical disc, and transferring drawing data from the drawing data generating means to the laser irradiation means Data transfer means, synchronization signal detection means for detecting a synchronization signal at a timing for synchronizing with the optical disc, and reference counter generation means for counting time at a constant interval and generating a count value, the synchronization signal The detection timing of the synchronization signal detected by the detection means and the reference counter generator Based on the count value from, and is characterized in that to detect the drawing position shift amount.

  An optical disc control apparatus according to a second aspect of the present invention is the optical disc control apparatus according to the first aspect, wherein the reference counter generating means counts a time at a constant interval by a CPU having a timer circuit to generate a count value. It is characterized by.

  An optical disc control device according to a third aspect of the present invention is the optical disc control device according to the first aspect, further comprising reference clock generation means for generating a clock synchronized with a detection position expected of the synchronization signal, and the synchronization signal detection means. The drawing position shift amount is detected based on the detection timing of the synchronization signal detected in step (b) and the target timing clock from the reference clock generation means.

  According to a fourth aspect of the present invention, there is provided an optical disc control apparatus for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation, and a laser irradiation means for performing laser irradiation on the optical disc. , Using drawing data generated from the outside, drawing data generating means for generating drawing data, servo control means for controlling rotation of the optical disc, and transferring drawing data from the drawing data generating means to the laser irradiation means Data transfer means, and a synchronization signal detection means for detecting a synchronization signal at the timing of synchronization with the optical disc, the data transfer means based on the drawing data transfer amount from the drawing data generation means, Drawing position detecting means for detecting the current drawing data position, and the synchronization signal detecting means A target drawing data transfer amount at a detection timing is detected, and a drawing position shift amount is detected based on the target drawing data transfer amount and a transfer amount up to the current drawing data position. .

  An optical disk control device according to a fifth aspect of the present invention is the optical disk control device according to the fourth aspect, wherein the drawing position detecting means is based on a drawing data amount transferred from the drawing data generating means to the laser irradiation means. The present invention is characterized in that the current drawing data position is detected.

  An optical disk control apparatus according to a sixth aspect of the present invention is the optical disk control apparatus according to any one of the first and fourth aspects, wherein the servo control means is based on the detected amount of drawing position deviation in the circumferential direction. The correction control is performed by changing the rotational speed of the optical disc in a direction in which the drawing position deviation amount becomes smaller.

  An optical disc control apparatus according to a seventh aspect of the present invention is the optical disc control apparatus according to any one of the first and fourth aspects, wherein the drawing data generating means detects the detected drawing position deviation in the circumferential direction and the radial direction. And a drawing data control means for performing correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount.

  An optical disc control device according to an eighth aspect of the present invention is the optical disc control device according to the seventh aspect, wherein the drawing data generating means thins out or adds the drawing data to the last drawing data of the track of the optical disc. It has a drawing data control means for performing correction control.

  The optical disk control device according to a ninth aspect of the present invention is the optical disk control device according to the seventh aspect, wherein the drawing data control means performs the same correction data as the drawing data addition portion when performing correction control by adding the drawing data. Is used for additional data.

  An optical disk control device according to a tenth aspect of the present invention is the optical disk control device according to the seventh aspect, wherein the drawing data control means performs space control at a place where drawing data is added when performing correction control by adding drawing data. It is characterized by using.

  An optical disc control device according to an eleventh aspect of the present invention is the optical disc control device according to any one of the first and fourth aspects, wherein the drawing data generating means extends the received data from the outside and detects the detected circle. An expansion magnification control means is provided for performing correction control by changing the expansion magnification of the received data so as to reduce the drawing position displacement amount based on the drawing position displacement amount in the circumferential direction and the radial direction. is there.

  An optical disc control device according to a twelfth aspect of the present invention is the optical disc control device according to any one of the first and fourth aspects, wherein the data transfer means is based on the detected amount of drawing position deviation in the circumferential direction. It has a writing frequency control means for changing the data transfer amount by changing the writing data writing frequency and performing correction control.

  An optical disk control device according to a thirteenth aspect of the present invention is the optical disk control device according to any one of the first and fourth aspects, wherein the optical disk rotation speed is changed, drawing data is thinned out or added, or received data is expanded. One of changing the magnification and changing the writing data writing frequency is selected according to the detected drawing position deviation amount.

  According to a fourteenth aspect of the present invention, there is provided an optical disc control apparatus for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation, and a laser irradiation means for performing laser irradiation on the optical disc. A drawing data generating unit that generates drawing data using received data from the outside, and a data transfer unit that transfers the drawing data from the drawing data generating unit to the laser irradiation unit. The means includes drawing data correction means for generating drawing data for the track N of the optical disc using the track N and a track adjacent to the track N and performing correction control.

  An optical disk control device according to a fifteenth aspect of the present invention is the optical disk control device according to the fourteenth aspect, wherein the drawing data correction means sends drawing data for a track N of the optical disk in a track N and an outer circumferential direction of the track N. It is generated using the adjacent track N + 1.

  An optical disk control device according to a sixteenth aspect of the present invention is the optical disk control device according to the fourteenth aspect, further comprising synchronization signal detection means for detecting timing for synchronization with the optical disk, wherein the drawing data correction means is provided on the optical disk. The correction control for the track N is changed according to the drawing position at the detection timing of the synchronization signal of the synchronization signal detection means.

  The optical disc control apparatus according to claim 17 of the present invention is the optical disc control apparatus according to claim 14, wherein the servo control means includes a traverse control means for controlling an irradiation position of the laser irradiation means in a radial direction, and the traverse control means. A drawing position detecting means for detecting a drawing position in a radial direction of the laser irradiation means by the control means, and the drawing data correcting means calculates correction control for the track N of the optical disc from the drawing position detecting means. It changes according to the drawing position of a radial direction, It is characterized by the above-mentioned.

  An optical disk control apparatus according to an eighteenth aspect of the present invention is the optical disk control apparatus according to the fourteenth aspect, wherein the servo control means includes: a traverse control means for controlling an irradiation position of the laser irradiation means in a radial direction; A drawing position reading unit for detecting a drawing position in the radial direction from the reflectance, and a radial drawing position for detecting a deviation amount between a current drawing position in the radial direction read by the drawing position reading unit and a target drawing position. The drawing data generation means has drawing position deviation amount storage means for storing the drawing position deviation amount in the past drawing processing detected by the radial drawing position deviation amount detection means. Then, the drawing data correction means tracks the optical disc based on the drawing position deviation amount stored in the drawing position deviation amount storage means. The drawing data for N, is characterized in that produced using the adjacent track of the track N and the track N.

  The optical disc control device according to claim 19 of the present invention is the optical disc control device according to any one of claims 1, 4, and 16, wherein the synchronization signal detecting means is based on physical information embedded in the optical disc. Thus, a synchronization signal is detected.

  An optical disc control method according to claim 20 of the present invention is an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation, and a laser irradiation step for performing laser irradiation on the optical disc; The drawing data generation step for generating drawing data using the received data from the outside, the servo control step for controlling the rotation of the optical disc, and the drawing data generated in the drawing data generation step are transferred to the laser irradiation means. A data transfer step, a synchronization signal detection step for detecting a synchronization signal at a timing for synchronizing with the optical disc, and a reference counter generation step for generating a count value by counting time at a predetermined interval, Detection timing of the synchronization signal detected in the detection step And based on the count value of the reference counter generating step, it is characterized in that to detect the drawing position shift amount.

  The optical disc control method according to a twenty-first aspect of the present invention is the optical disc control method according to the twentieth aspect, wherein the reference counter generating step counts a time at a constant interval by a CPU having a timer circuit to generate a count value. It is characterized by.

  An optical disc control method according to claim 22 of the present invention is the optical disc control method according to claim 20, further comprising a reference clock generation step of generating a clock synchronized with a detection position expected of the synchronization signal, and the synchronization signal detection step. The amount of drawing position deviation is detected based on the detection timing of the synchronization signal detected in step 1 and the clock at the target timing of the reference clock generation step.

  According to a twenty-third aspect of the present invention, there is provided an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation, a laser irradiation step for performing laser irradiation on the optical disc; The drawing data generation step for generating drawing data using the received data from the outside, the servo control step for controlling the rotation of the optical disc, and the drawing data generated in the drawing data generation step are transferred to the laser irradiation means. And a synchronization signal detection step for detecting a synchronization signal at a timing for performing synchronization with the optical disc, wherein the data transfer step is based on the drawing data transfer amount generated in the drawing data generation means step. Drawing position detection step for detecting the current drawing data position And detecting the target drawing data transfer amount at the detection timing of the synchronization signal in the synchronization signal detecting step, and based on the target drawing data transfer amount and the transfer amount up to the current drawing data, the drawing position deviation amount Is detected.

  The optical disc control method according to a twenty-fourth aspect of the present invention is the optical disc control method according to the twenty-third aspect, wherein the drawing position detecting step is based on a drawing data amount transferred from the drawing data generating unit to the laser irradiation unit. The drawing data position is detected.

  The optical disc control method according to claim 25 of the present invention is the optical disc control method according to any one of claims 20 and 23, wherein the servo control step is based on the detected amount of drawing position deviation in the circumferential direction. The correction control is performed by changing the rotational speed of the optical disc in a direction in which the drawing position deviation amount becomes smaller.

  The optical disc control method according to claim 26 of the present invention is the optical disc control method according to any one of claims 20 and 23, wherein the drawing data generation step includes the detected drawing position deviation amounts in the circumferential direction and the radial direction. And a drawing data control step for performing correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount.

  The optical disc control method according to claim 27 of the present invention is the optical disc control method according to claim 26, wherein the drawing data generation step thins or adds the drawing data to the final drawing data of the track of the optical disc. It has a drawing data control step for performing correction control.

  The optical disk control method according to a twenty-eighth aspect of the present invention is the optical disk control method according to the twenty-sixth aspect, wherein when the drawing data control step performs correction control by adding the drawing data, the same data as the portion to which the drawing data is added. Is used for additional data.

  The optical disk control method according to a twenty-ninth aspect of the present invention is the optical disk control method according to the twenty-sixth aspect, in which the drawing data control step includes a step of adding space data to a place where drawing data is added when performing correction control by adding drawing data. It is characterized by using.

  The optical disk control method according to a thirty-third aspect of the present invention is the optical disk control method according to any one of the twenty-third and twenty-third aspects, wherein the drawing data generation step performs an extension process on received data from the outside and detects a detected circle An expansion magnification control step for performing correction control by changing the expansion magnification of the received data based on the drawing position displacement amount in the circumferential direction and the radial direction so as to reduce the drawing position displacement amount is provided. is there.

  The optical disc control method according to claim 31 of the present invention is the optical disc control method according to any one of claims 20 and 23, wherein the data transfer step is based on the detected amount of drawing position deviation in the circumferential direction. It has a writing frequency control step of changing the data transfer amount by changing the writing data writing frequency and performing correction control.

  An optical disk control method according to a thirty-second aspect of the present invention is the optical disk control method according to any one of the twenty-fifth to thirty-first aspects, wherein the optical disk rotation speed is changed, drawing data is thinned out or added, or received data is expanded. One of changing the magnification and changing the writing data writing frequency is selected according to the detected drawing position deviation amount.

  An optical disc control method according to a thirty-third aspect of the present invention is an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation, and a laser irradiation step for performing laser irradiation on the optical disc; A drawing data generation step for generating drawing data using received data from the outside, and a data transfer step for transferring the drawing data generated in the drawing data generation step to the laser irradiation means. Has a drawing data correction step of generating drawing data for track N of the optical disc using track N and a track adjacent to track N and performing correction control.

  The optical disk control method according to a thirty-fourth aspect of the present invention is the optical disk control method according to the thirty-third aspect, wherein the drawing data correction step includes drawing data for the track N of the optical disk in the outer circumferential direction of the track N and the track N. It is generated using the adjacent track N + 1.

  An optical disc control method according to a thirty-fifth aspect of the present invention is the optical disc control method according to the thirty-third aspect, further comprising a synchronization signal detecting step for detecting timing for synchronizing with the optical disc, wherein the drawing data correction step is performed on the optical disc. The correction control for the track N is changed according to the drawing position at the synchronization signal detection timing of the synchronization signal detection step.

  The optical disk control method according to a thirty-sixth aspect of the present invention is the optical disk control method according to the thirty-third aspect, wherein the servo control step includes a traverse control step for controlling a radial irradiation position of a laser irradiation means, and the traverse control. A drawing position detecting step for detecting a drawing position in the radial direction of the laser irradiation means controlled by the step, wherein the drawing data correcting step calculates correction control for the track N of the optical disc in the drawing position detecting step. It changes according to the drawing position of the radial direction to be performed.

  The optical disk control method according to a thirty-seventh aspect of the present invention is the optical disk control method according to the thirty-fourth aspect, wherein the servo control step includes: a traverse control step for controlling a radial irradiation position of the laser irradiation means; and a laser reflection. A drawing position reading step for detecting a drawing position in the radial direction from the rate, and a radial drawing position deviation for detecting a deviation amount between a current drawing position in the radial direction read in the drawing position reading step and a target drawing position. An amount detection step, and the drawing data generation step includes a drawing position deviation amount storage step for storing a drawing position deviation amount at the time of past drawing processing detected in the radial direction drawing position deviation amount detection step. The drawing data correction step is based on the drawing position deviation amount stored in the drawing position deviation amount storage step. Te, drawing data for the track N of the optical disk, is characterized in that produced using the adjacent track of the track N and the track N.

  An optical disc control method according to a thirty-eighth aspect of the present invention is the optical disc control method according to any one of the twenty-third, twenty-third, and thirty-fifth aspects, wherein the synchronization signal detecting step is based on physical information embedded in the optical disc. Thus, a synchronization signal is detected.

  By the optical disk control device and the optical disk control method of the present invention, it is possible to realize a drawing position shift correction process in the circumferential direction and the radial direction in the LS drawing process. Therefore, since the problem in performing the drawing process in LS in a spiral shape can be solved, a high-quality drawing process in a spiral shape can be performed. Since the spiral drawing process is one of the most important techniques for the high-speed drawing process of LS as described above, the present invention is a very effective invention for speeding up the LS drawing process.

  According to the optical disk control apparatus of the first aspect of the present invention, in the optical disk control apparatus that performs visual information drawing processing on an optical disk capable of drawing visual information by laser irradiation, the laser irradiation that performs laser irradiation on the optical disk. Means, drawing data generating means for generating drawing data using externally received data, servo control means for controlling rotation of the optical disc, drawing data from the drawing data generating means, and laser irradiation means Data transfer means for transferring to, a synchronization signal detection means for detecting a synchronization signal at a timing for synchronizing with the optical disc, and a reference counter generation means for counting time at a constant interval and generating a count value, Detection timing of the synchronization signal detected by the synchronization signal detection means and the reference counter Based on the count value from adult means, since in order to detect the drawing position shift amount, the detection of the drawing position shift amount in the LS drawing process there is an effect that can be achieved.

  According to an optical disk control device of a second aspect of the present invention, in the optical disk control device according to the first aspect, the reference counter generating means counts a time at a predetermined interval by a CPU having a timer circuit to generate a count value. As a result, it is possible to easily detect the target drawing position or drawing position passing timing using the timer circuit and the interrupt process. Here, the present invention can be realized by preparing only a CPU. However, many general optical disk drive systems incorporate a CPU, and the present invention is realized without adding new components. It is also possible.

  According to an optical disk control device of a third aspect of the present invention, in the optical disk control device according to the first aspect of the present invention, the optical disk control device further comprises reference clock generation means for generating a clock synchronized with a detection position expected of the synchronization signal, and the synchronization signal Since the drawing position deviation amount is detected based on the detection timing of the synchronization signal detected by the detecting means and the clock of the target timing from the reference clock generating means, an ideal specific position passing timing is detected by the reference counter. There is an effect that a target drawing position can be specified using a clock synchronized with the.

  According to the optical disk control apparatus of the fourth aspect of the present invention, in the optical disk control apparatus that performs visual information drawing processing on an optical disk capable of drawing visual information by laser irradiation, the laser irradiation that performs laser irradiation on the optical disk. Means, drawing data generating means for generating drawing data using externally received data, servo control means for controlling rotation of the optical disc, drawing data from the drawing data generating means, and laser irradiation means Data transfer means for transferring to the optical disk, and synchronization signal detection means for detecting a synchronization signal at the timing of synchronization with the optical disc, wherein the data transfer means is based on a drawing data transfer amount from the drawing data generating means. Drawing position detecting means for detecting the current drawing data position, and the synchronization signal detecting means The target drawing data transfer amount at the signal detection timing is detected, and the drawing position shift amount is detected based on the target drawing data transfer amount and the transfer amount up to the current drawing data position. When the position information of the data used in the drawing process is used as the drawing position timing detection method, the laser irradiation pattern to the optical disk is processed and generated based on the drawing data corresponding to the target drawing position. Therefore, there is an effect that it is possible to detect the target drawing position by referring to the drawing data position accessed for generation and calculating.

  According to an optical disk control device of a fifth aspect of the present invention, in the optical disk control device according to the fourth aspect, the drawing position detection unit is based on a drawing data amount transferred from the drawing data generation unit to the laser irradiation unit. Since the current drawing data position is detected, when the data position transferred to the laser irradiation unit is used for the timing detection of the target drawing position, the transfer process to the laser irradiation unit is performed. Since this is the final process in the drawing data generation process, it is possible to use data that is most easily synchronized with the drawing process. In addition, the transfer process often uses a device such as DMA, for example, but such a device often has a transfer position display function and the like. The present invention can be easily realized.

  According to an optical disk control device of a sixth aspect of the present invention, in the optical disk control device according to any one of the first and fourth aspects, the servo control means is based on the detected drawing position deviation amount in the circumferential direction. Thus, the optical disk rotation speed is changed in the direction in which the drawing position deviation amount is reduced, and correction control is performed. Therefore, the target drawing position can be controlled by controlling in the direction in which the detected drawing position deviation is eliminated. It is possible to return the drawing process to the above, and it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disk control device of a seventh aspect of the present invention, in the optical disk control device according to any one of the first and fourth aspects, the drawing data generation means detects the detected drawing positions in the circumferential direction and the radial direction. Since drawing data control means for performing correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount based on the deviation amount, the drawing process is returned to the target drawing position. Therefore, there is an effect that it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disk control device of an eighth aspect of the present invention, in the optical disk control device according to the seventh aspect, the drawing data generating means thins out or adds the drawing data to the final drawing data of the track of the optical disk. Since the drawing data control means for performing the correction control is provided, the drawing process can be returned to the target drawing position, and it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disk control device of a ninth aspect of the present invention, in the optical disk control device according to the seventh aspect, when the drawing data control means performs correction control by adding drawing data, Since the same data is used as the additional data, it is possible to return the drawing process to the target drawing position, and there is an effect that it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disc control apparatus of a tenth aspect of the present invention, in the optical disc control apparatus according to the seventh aspect, when the drawing data control means performs correction control by adding drawing data, Since the space data is used, it is possible to return the drawing process to the target drawing position, and there is an effect that it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disc control apparatus of an eleventh aspect of the present invention, in the optical disc control apparatus according to any one of the first and fourth aspects, the drawing data generating means performs an extension process on received data from the outside and is detected. In accordance with the drawing position deviation amount in the circumferential direction and the radial direction, the expansion magnification control means for performing correction control by changing the expansion magnification of the received data so as to reduce the drawing position deviation amount is provided. Thus, the drawing process can be returned to the drawing position, and it is easy to control in real time in the drawing process. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disk control device of a twelfth aspect of the present invention, in the optical disk control device according to any one of the first and fourth aspects, the data transfer means is based on the detected amount of drawing position deviation in the circumferential direction. Since the writing frequency control means for performing correction control by changing the data transfer amount by changing the writing data writing frequency, the drawing processing can be returned to the target drawing position. There is an effect that it is easy to control in real time. Accordingly, it is possible to realize various countermeasures against the drawing position deviation factor by performing the drawing position deviation correction processing in real time.

  According to an optical disk control device of a thirteenth aspect of the present invention, in the optical disk control device according to any one of the first and fourth aspects, the optical disk rotation speed is changed, drawing data is thinned out or added, or received data Since either the expansion magnification of the image or the writing data writing frequency is changed according to the detected drawing position deviation amount, by selecting an appropriate correction process for each situation, There is an effect that correction processing with higher accuracy becomes possible.

  According to the optical disk control apparatus of the fourteenth aspect of the present invention, in the optical disk control apparatus that performs visual information drawing processing on an optical disk capable of drawing visual information by laser irradiation, the laser irradiation that performs laser irradiation on the optical disk. Means, drawing data generating means for generating drawing data using received data from the outside, and data transfer means for transferring drawing data from the drawing data generating means to the laser irradiation means, the drawing data The generating means includes drawing data correcting means for generating drawing data for the track N of the optical disc by using the track N and a track adjacent to the track N to perform correction control, and according to claim 15 of the present invention. According to the optical disk control device, the drawing data in the optical disk control device according to claim 14. Since the correction means generates the drawing data for the track N of the optical disc using the track N and the adjacent track N + 1 in the outer circumferential direction of the track N, the correction of the drawing position deviation in the radial direction in the LS drawing processing. When generating drawing data adaptively, use drawing data whose drawing position is adjacent to the inner or outer direction depending on the amount of deviation in the radial direction with respect to the drawing data at the radial position to be drawn. Thus, drawing data suitable for the drawing position in the radial direction can be generated. For example, when a spiral drawing process is performed, the recording position shift in the radial position direction of the LS always occurs. However, by introducing the inventions of claims 14 and 15, the position including the position shift is always suitable for the radial position. Since drawing data can be generated and drawn, high-quality drawing processing can be realized. The inventions of claims 14 and 15 are a drawing data generation method in which the drawing position deviation amount in the radial direction in the drawing process is set up to an adjacent drawing position. In the case where a deviation greater than or equal to the adjacent drawing position in the radial direction occurs, the inventions of claims 14 and 15 may be applied based on the drawing data at the closest radial position.

  According to an optical disk control device of a sixteenth aspect of the present invention, in the optical disk control device according to the fourteenth aspect of the present invention, the optical disk control device includes synchronization signal detection means for detecting timing for synchronization with the optical disk, Since the correction control for the track N of the optical disk is changed in accordance with the drawing position at the detection timing of the synchronization signal of the synchronization signal detecting means, the correction for the radial position deviation is corrected by the position information in the circumferential direction of the drawing process. When controlling based on the above, for example, when the amount of radial drawing position deviation from the circumferential drawing position is known in advance, such as spiral drawing processing, it is possible to perform correction very effectively There is.

  According to the optical disk control device of the seventeenth aspect of the present invention, in the optical disk control device according to the fourteenth aspect, the servo control means includes a traverse control means for controlling an irradiation position in the radial direction of the laser irradiation means, A drawing position detecting unit for detecting a drawing position in a radial direction of the laser irradiation unit by the traverse control unit, and the drawing data correcting unit calculates correction control for the track N of the optical disc from the drawing position detecting unit. Since the position is changed according to the drawing position in the radial direction, the current drawing position in the radial direction is detected based on the traverse control processing in the radial direction, and the amount of positional deviation from the radial position corresponding to the drawing data By processing the drawing data, the optimum drawing process in the radial direction can always be realized. In the invention of claim 17, the present drawing position detection in the radial direction can be easily realized by calculating from the history of traverse control by a combination of a CPU and a program, for example.

  According to an optical disk control device of an eighteenth aspect of the present invention, in the optical disk control device according to the fourteenth aspect, the servo control means includes a traverse control means for controlling an irradiation position in the radial direction of the laser irradiation means, A drawing position reading unit for detecting a drawing position in the radial direction from the reflectance of the laser, and a radial direction for detecting a deviation amount between a current drawing position in the radial direction read by the drawing position reading unit and a target drawing position. A drawing position deviation amount detecting means, wherein the drawing data generating means stores a drawing position deviation amount storage means for storing a drawing position deviation amount at the time of past drawing processing detected by the radial direction drawing position deviation amount detecting means; And the drawing data correction means is based on the drawing position deviation amount stored in the drawing position deviation amount storage means. Since the drawing data for the rack N is generated using the track N and a track adjacent to the track N, the drawing process is first tested when the radial drawing position deviation correction is performed in the LS drawing process. The drawing position shift amount in the radial direction for each drawing process of the radial position is detected by the process of scanning the drawing position in the radial direction with respect to the LS disc after the drawing process, the detection result is stored, and the actual LS drawing is performed. By using the result of the drawing position deviation amount at the time of testing and generating drawing data corresponding to the deviation amount using adjacent drawing data etc., the drawing process is always optimal in the radial direction. There is an effect that a drawing process can be executed using data. The present invention is an effective measure against a cause of a drawing position shift that occurs in each drive such as a traverse control error.

  According to the optical disk control device of the nineteenth aspect of the present invention, in the optical disk control device according to any one of the first, fourth, and sixteenth aspects, the synchronization signal detecting means is physical information embedded in the optical disk. Since the sync signal is detected based on the optical disc, a mark indicating a specific position in the circumferential direction is embedded in the inner circumference of the optical disc corresponding to the LS drawing process. By irradiating and acquiring reflected light, there is an effect that it is possible to detect a specific position passing timing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the optical disc control apparatus according to the first embodiment of the present invention.
The optical disk control device 400 is an optical disk control device that performs LS drawing processing. The configuration and operation other than the servo control unit 401, the synchronization signal detection unit 402, the reference counter generation unit 403, the drawing position deviation detection unit 404, and the drawing data generation unit 405 are the same as those in the conventional example, and the description thereof is omitted. To do.

  The servo control unit 401 adds a function for realizing a spiral drawing process to the conventional servo control unit 202. The servo control unit 401 performs control to move the radial position of the drawing process to the outer circumferential direction at every fixed angle and to move to the radial position where the next drawing process is performed once in one round when performing the LS spiral drawing process. .

  The synchronization signal detection unit 402 generates timing at regular intervals based on the constant angle passage timing generated by the spindle motor 201. The synchronization signal detection unit 402 generates a synchronization signal in accordance with the frequency at which the drawing position deviation is detected and corrected. Here, the synchronization signal detection unit 402 detects a synchronization signal based on physical information embedded in the optical disc 101.

  The reference counter generation unit 403 generates a reference counter value that is referred to by the drawing position deviation detection unit 404. In this embodiment, the reference counter value is generated using the timer function of the CPU 204. However, the reference counter generation unit 403 may be replaced with one that can generate timing at a constant interval without being affected by the rotation of the optical disc 101. Good.

  The drawing position deviation detection unit 404 detects the amount of drawing position deviation in the circumferential direction and the radial direction based on the synchronization signal detected from the synchronization signal detection unit 402 and the reference counter value generated from the reference counter generation unit 403. To do.

  The drawing data generation unit 405 has a drawing position deviation correction processing function in addition to the functions of the conventional drawing data generation unit 203. The drawing data generation unit 405 performs drawing position deviation correction from the circumferential and radial drawing position deviation amounts transmitted from the drawing position deviation detection unit 404. Here, the drawing data generation unit 405 changes the expansion magnification (development magnification S) of the received data so as to reduce the drawing data position deviation amount based on the circumferential and radial drawing position deviation amounts, and performs correction control. Expansion magnification control means 405a for expanding the received data from the outside.

  Further, the drawing data generation unit 405 includes drawing data correction means 405 b that generates drawing data for the track N of the optical disc 101 using the track N and a track adjacent to the track N and performs correction control. Note that the adjacent track N + 1 in the outer circumferential direction of the track N may be used as the adjacent track of the track N. Here, the drawing data correction unit performs correction control on the track N of the optical disc according to the drawing position at the detection timing of the synchronization signal of the synchronization signal detection unit 402, the adjacent track N-1 in the inner circumferential direction of the track N, Alternatively, it is possible to change which of the adjacent tracks N + 1 in the outer circumferential direction of the track N is used.

Next, the operation will be described.
FIG. 2 is a flowchart of drawing position deviation detection by the drawing position deviation detection unit 404 of the optical disc control apparatus according to the first embodiment of the present invention, and the details thereof will be described below. Here, the misalignment detection processing by the drawing misregistration detection unit 404 is executed when the synchronization signal detection unit 402 detects a synchronization signal. The misregistration detection operation by the rendering misregistration detection unit 404 is, for example, the CPU 204. In this case, if the synchronization signal is used as an interrupt signal and this is executed in the interrupt process, it can be efficiently performed.

  First, when detecting the drawing position deviation amount in the circumferential direction, the drawing position deviation detection unit 404 generates the expected value C_exp of the counter value of the reference counter generation unit 403 at the synchronization signal detection timing (step S201). Here, N is the expected value of the reference counter value updated at the synchronization signal detection interval, and the expected value C_exp is the cumulative value. The value of N can be easily calculated from the rotation speed of the optical disc 101 and the synchronization signal detection interval before starting the drawing process. Further, since C_exp is accumulated, it is necessary to initialize it at an appropriate timing, for example, before starting the drawing process.

  Next, the drawing position detection deviation detection unit 404 calculates an actual measurement value C_det of the reference counter value at the synchronization signal detection timing (step S202). Here, T_c is a reference counter value updated between the synchronization signal detection intervals, that is, the immediately preceding synchronization signal detection timing and the current synchronization signal detection timing, and is calculated from the counter value of the timer circuit or the like. C_det is the cumulative counter value for each detection interval.

  Then, a difference C_dif between the expected counter value C_exp and the actual counter value C_det is calculated (step S203). C_exp represents an expected value of time spent until the synchronization signal detection timing, and C_det represents time actually spent until the synchronization signal detection timing. Therefore, the difference C_det is a drawing position shift amount in the circumferential direction.

  In order to correct the drawing position shift in the circumferential direction, the drawing position shift amount C_dif in the circumferential direction is transmitted to the drawing data generation block 405 (step S204).

  Next, when detecting the drawing position deviation amount in the radial direction, the angular position information A of the drawing process, which is the current angular position at the synchronization signal detection timing, is expressed by using the equation A = (A + A_unit)% 360/360. The angle amount A_unit of the synchronization signal detection interval is accumulated and calculated by normalizing in units of one round (step S205).

  Then, in order to correct the drawing position deviation in the radial direction, the current angle information is transmitted to the drawing data generation unit 405 (step S206). This is because, when performing the LS spiral drawing process, the amount of radial position deviation is calculated based on the current angle information by the control method of the servo control unit 401 in the first embodiment.

  FIG. 3 is another flowchart of drawing position deviation detection by the drawing position deviation detection unit 404 of the optical disc control apparatus according to the first embodiment of the present invention. Note that steps S301 to S304 in FIG. 3 are the same as steps S201 to S204 in FIG.

  In FIG. 3, when detecting the drawing position deviation amount in the radial direction, instead of the current angular position, the cumulative amount of movement control in the radial direction of the radial laser irradiation position P_r and the track interval P_unit in the servo control unit 401. From this, the positional deviation amount B in the radial direction is calculated using the equation B = P_r% P_unit (step S305). Then, in order to correct the drawing position deviation in the radial direction, the drawing position deviation amount in the radial direction is transmitted to the drawing data generation unit 405 (step S306).

  FIG. 4 is a flowchart of the drawing position deviation correction in the drawing data generation unit 405 of the optical disc control apparatus according to the first embodiment of the present invention, and details thereof will be described below. If correction of the drawing position deviation in the circumferential direction or the radial direction is not performed, the development magnification correction amount S_cr and the correction coefficient D_cr may be set to 0, respectively.

  First, using the frequency P of the received data and the frequency Q of the writing process of the drawing data that is the actual writing data, the development magnification S is obtained (step S401), and the drawing position deviation amount C_dif in the circumferential direction is greater than the threshold Th1. It is determined whether or not it is small (step S402). If the drawing position shift amount C_dif in the circumferential direction is smaller than the threshold Th1 (Yes in step S402), it is determined that the drawing position has advanced too much, and the development magnification S is set to the development magnification using the equation S = S-S_cr. A correction for decreasing the correction amount S_cr is performed (step S403). The development magnification correction amount S_cr may be changed according to the drawing position deviation amount C_dif.

  When the circumferential drawing position shift amount C_dif is larger than the threshold Th1 (No in step S402), it is determined whether the circumferential drawing position shift amount C_dif is larger than the threshold Th2 (step S404). If the drawing position deviation amount C_dif in the circumferential direction is larger than the threshold value Th2 (Yes in step S404), it is determined that the drawing position is too late, and the development magnification S is calculated using the equation S = S + S_cr. A correction to increase by S_cr is performed (step S405). The development magnification correction amount S_cr may be changed according to the drawing position deviation amount C_dif.

  Next, according to the drawing position deviation amount of the radial position, the reception data of the adjacent track in the outer peripheral direction with respect to the reception data D_n that is the current drawing data generation target using the formula D_n = D_n + D_cr * (A * D_n + 1) D_n + 1 is matched (step S406). The correction amount to be adjusted is determined by the angular position information A and the correction coefficient D_cr. Then, using the corrected expansion magnification S and the received data D_n, expansion data is generated (step S407).

  In the first embodiment, the case where the drawing position shift amount in the circumferential direction is detected based on the synchronization detection timing of the synchronization signal detection unit 402 and the count value of the reference counter generation unit 403 has been described. A reference clock generation unit that generates a clock synchronized with the detection position where the signal is expected may be provided, whereby the synchronization detection timing of the synchronization signal detection unit 402 and the clock at the target timing from the reference clock generation unit The drawing position deviation amount in the circumferential direction can be detected based on the above.

  As described above, in the first embodiment, when detecting the drawing position deviation amount in the circumferential direction in the LS drawing processing, the actual drawing position or drawing position passing timing and the target drawing position or drawing position passing are detected. The timing is detected, and the drawing position deviation amount is detected by taking the difference between the two timings. Here, in the present invention, the LS specific position passage timing is used as the actual drawing position passage timing. Further, a reference counter that can generate a timing at regular intervals without being affected by disk rotation control or the like in the LS drawing process is used as the target drawing position passage timing. This is because the LS drawing process is performed by the CLV (Constant Linear Velocity) method, and therefore it is possible to specify the target drawing position by using a reference counter with a constant interval. In addition, even when drawing processing using the CAV (Constant Angular Velocity) method is performed, the target drawing position can be specified in the same manner by considering the speed change amount at the drawing position.

  As described above, according to the first embodiment, the drawing data generation unit 405 that generates the drawing data, the servo control unit 401 that controls the rotation of the optical disc 101, and the optical disc 101 using the received data from the outside. A synchronization signal detected by the synchronization signal detection unit 402 includes a synchronization signal detection unit 402 that detects a synchronization signal at the timing of synchronization, and a reference counter generation unit 403 that counts time at regular intervals and generates a count value. Since the drawing position deviation amount is detected based on the detection timing and the count value from the reference counter generation unit 403, the drawing position deviation amount in the LS drawing process can be detected.

(Embodiment 2)
FIG. 5 is a block diagram showing a configuration of the optical disc control apparatus according to the second embodiment of the present invention.
The optical disc control device 500 is an optical disc control device that performs LS drawing processing. The configuration and operation other than the drawing position deviation detection unit 501 and the BCU / DMA unit 502 are the same as those of the optical disc control apparatus 400 described in the first embodiment, and the description thereof is omitted.

  The drawing position deviation detection unit 501 detects the drawing position deviation amount in the circumferential direction and the radial direction based on the synchronization signal detected from the synchronization signal detection unit 402 and the drawing data transfer amount measured by the BCU / DMA unit 502. To do.

  The BCU / DMA unit 502 arbitrates access to the data storage unit 209 and has a function of measuring the transfer amount of drawing data transferred to the writing strategy unit 207 in addition to a function of transferring drawing data. In addition, the BCU / DMA unit 502 includes a drawing position detection unit 502 a that detects the current drawing data position based on the drawing data amount transferred from the drawing data generation unit 405 to the laser irradiation unit 206.

  FIG. 6 is a flowchart of the drawing position deviation detection by the drawing position deviation detection unit 501 of the optical disc control apparatus according to the second embodiment of the present invention, and the details thereof will be described below. The drawing position deviation detection unit 501 performs the drawing position deviation detection process when the synchronization signal detection unit 402 detects the synchronization signal. The drawing position deviation detection unit 501 performs the position deviation detection operation, for example, with the CPU 204 and a program. If the synchronization signal is used as an interrupt signal and this is performed by interrupt processing, it can be efficiently performed.

  First, when the amount of drawing position deviation in the circumferential direction is detected, the expected value PD_exp of the drawing data transfer amount at the synchronization signal detection timing is generated by adding S to the current expected value PD_exp (step S601). Here, S is the expected value of the drawing data transfer amount at the synchronization signal detection interval, and the expected value PD_exp is the cumulative value. The value of S can be easily calculated from the amount of received data for each track sent from the host 301 and the synchronization signal detection interval. Further, since PD_exp is accumulated, it is necessary to initialize it at an appropriate timing, for example, before starting the drawing process.

  Next, a difference PD_dif between the expected counter value PD_exp and the actual drawing data transfer amount PD_det is calculated (step S602). Here, the actual drawing data transfer amount PD_det is measured by the BCU / DMA unit 502. PD_exp represents the drawing processing amount expected until the synchronization signal detection timing, and PD_det represents the drawing processing amount actually consumed until the synchronization signal detection timing. Therefore, the difference PD_det is a drawing position shift amount in the circumferential direction.

  In order to correct the drawing position shift in the circumferential direction, the drawing position shift amount PD_dif in the circumferential direction is transmitted to the drawing data generation unit 405 (step S603).

  Next, when detecting the drawing position deviation amount in the radial direction, the angular position information A of the drawing process, which is the current angular position at the synchronization signal detection timing, is expressed by using the equation A = (A + A_unit)% 360/360. The angular amount A_unit of the synchronization signal detection interval is accumulated and calculated by normalizing in units of one round (step S604).

  In order to correct the drawing position shift in the radial direction, the current angular position information A is transmitted to the drawing data generation unit 405 (step S605).

  As described above, according to the second embodiment, the BCU / DMA unit 502 that transfers the drawing data from the drawing data generation unit 405, the servo control unit 401 that controls the rotation of the optical disc 101, and the optical disc 101 are synchronized. A synchronization signal detection unit 402 that detects a timing synchronization signal, and the BCU / DMA unit 502 determines the current drawing data position based on the amount of drawing data transferred from the drawing data generation unit 405 to the laser irradiation unit 206. A drawing position detection unit 502a for detecting the target drawing data transfer amount at the detection timing of the synchronization signal by the synchronization signal detection unit 402, and the target drawing data transfer amount and the current drawing data position. Since the drawing position deviation amount is detected based on the transfer amount, it is possible to detect the drawing position deviation amount in the LS drawing processing. There is an effect that kill.

(Embodiment 3)
FIG. 7 is a block diagram showing a configuration of the optical disc control apparatus according to the third embodiment of the present invention.
The optical disc control device 600 is an optical disc control device that performs LS drawing processing. The configuration and operation other than the servo control unit 601 are the same as those of the optical disc control apparatus 400 described in the first embodiment, and the description thereof is omitted.

  In addition to the functions of the servo control unit 401 of the first embodiment, the servo control unit 601 performs drawing position deviation correction based on the drawing position deviation amount in the circumferential direction transmitted from the drawing position deviation detection unit 404.

  FIG. 8 is a flowchart of the drawing position deviation correction by the servo control unit 601 of the optical disc control apparatus according to the third embodiment of the present invention, and the details thereof will be described below. If the drawing position deviation correction in the circumferential direction is not performed, the drawing deviation correction amount SP_cr may be set to zero.

  First, the current disk rotational speed SP is obtained (step S801), and it is determined whether or not the drawing position deviation amount in the circumferential direction is smaller than the threshold value Th1 (step S802). If the amount of drawing position deviation in the circumferential direction is smaller than the threshold Th1 (Yes in step S802), it is determined that the drawing position has advanced too much, and the disk rotational speed SP is increased using the formula SP = SP + SP_cr (step S803). ). The drawing deviation correction amount SP_cr may be changed according to the drawing position deviation amount.

  If the drawing position deviation amount in the circumferential direction is larger than the threshold value Th1 (No in step S802), it is determined whether or not the drawing position deviation amount in the circumferential direction is larger than the threshold value Th2 (step S804). If the amount of drawing position deviation in the circumferential direction is larger than the threshold Th2 (Yes in step S804), it is determined that the drawing position is too late, and the disk rotational speed SP is decreased using the formula SP = SP-SP_cr ( Step S805). Note that the drawing deviation correction amount SP_cr may be changed according to the drawing position deviation amount.

  Subsequently, the rotational speed of the optical disk is changed to the corrected disk rotational speed SP (step S806).

  In the third embodiment, correction control is performed by changing the number of rotations of the optical disk based on the amount of drawing position deviation in the circumferential direction detected as described in the first or second embodiment.

  As described above, according to the third embodiment, the servo control unit 601 corrects the rotational speed of the optical disc in a direction in which the drawing position deviation amount is reduced based on the detected drawing position deviation amount in the circumferential direction. Since the control is performed, there is an effect that the drawing position deviation correction process can be performed so that the detected drawing position deviation is eliminated.

(Embodiment 4)
FIG. 9 is a block diagram showing a configuration of the optical disc control apparatus according to the fourth embodiment of the present invention.
The optical disc control device 700 is an optical disc control device that performs LS drawing processing. The configuration and operation other than the drawing data generation block 701 are the same as those of the optical disc control apparatus 400 described in the first embodiment, and the description thereof is omitted.

  The drawing data generation unit 701 has a drawing position deviation correction function in addition to the functions of the conventional drawing data generation unit 203. The drawing data generation unit 701 performs drawing position deviation correction based on the circumferential and radial drawing position deviation amounts transmitted from the drawing position deviation detection unit 404. Here, the drawing data generation unit 701 has drawing data control means for performing correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount based on the drawing position deviation amount. Note that the drawing data control means may thin or add the drawing data to the last drawing data of the track on the optical disc 101. Further, when correction control is performed by adding drawing data by the drawing data control means, the same additional data or space data as the drawing data addition portion may be used.

  FIG. 10 is a flowchart of the drawing position deviation correction by the drawing data generation unit 701 of the optical disc control apparatus according to the fourth embodiment of the present invention, and the details thereof will be described below. In the case where the drawing position deviation correction in the circumferential direction or the radial direction is not performed, the correction coefficient D_cr and the data addition / thinning amount may be set to 0.

  First, a development magnification S is obtained using the frequency P of received data and the frequency Q of writing data writing processing (step S1001).

  Next, the adjacent track D_n + 1 in the outer peripheral direction is aligned with the received data D_n that is the current drawing data generation target, using the expression D_n = D_n + D_cr * (A * D_n + 1) according to the drawing position deviation amount of the radial position. (Step S1002). The correction amount to be adjusted is determined by the angular position information A and the correction coefficient D_cr. Then, using the corrected expansion magnification S and the received data D_n, expansion data is generated (step S1003).

  It is determined whether or not the drawing position deviation amount in the circumferential direction is smaller than the threshold value Th1 (step S1004). If the drawing position shift amount in the circumferential direction is smaller than the threshold Th1 (Yes in step S1004), it is determined that the drawing position has advanced too much, and the drawing data is thinned out (step S1005). The drawing data thinning-out amount may be changed according to the drawing position deviation amount.

  When the amount of drawing position deviation in the circumferential direction is larger than the threshold value Th1 (No in step S1004), it is determined whether or not the amount of drawing position deviation in the circumferential direction is larger than the threshold value Th2 (step S1006). If the drawing position shift amount in the circumferential direction is larger than the threshold Th2 (Yes in step S1006), it is determined that the drawing position is too late, and correction for adding drawing data is performed (step S1007). The drawing data addition amount may be changed according to the drawing position deviation amount. The drawing data to be added may be the same data as the added portion, space / mark fixing, or the like, but it may be selected to give data that does not affect the quality after drawing.

  In the fourth embodiment, the drawing position deviation amount is reduced based on the circumferential direction and radial direction drawing position deviation amounts detected as described in the first embodiment or the second embodiment. Correction control is performed by thinning out or adding data.

  As described above, according to the fourth embodiment, the drawing data generation unit 701 generates drawing data so that the drawing position deviation amount becomes small based on the detected circumferential position and radial drawing position deviation amounts. Since the drawing data control means for performing correction control by thinning or adding is provided, there is an effect that the drawing position deviation correction process can be performed so that the detected drawing position deviation is eliminated.

(Embodiment 5)
FIG. 11 is a block diagram showing a configuration of the optical disc control apparatus according to the fifth embodiment of the present invention.
The optical disc control apparatus 800 is an optical disc control apparatus that performs LS drawing processing. The configuration and operation other than the BCU / DMA unit 801 are the same as those of the optical disc control apparatus 400 described in the first embodiment, and the description thereof is omitted.

  The BCU / DMA unit 801 has a drawing position deviation correction function in addition to the function of the BCU / DMA unit 208 of the first embodiment. The BCU / DMA unit 801 corrects the drawing position deviation based on the drawing position deviation amount in the circumferential direction transmitted from the drawing position deviation detection unit 404. Here, the BCU / DMA unit 801 includes a writing frequency control unit 801a that performs correction control by changing the data transfer amount by changing the writing data writing frequency based on the circumferential drawing position shift amount. Yes.

  FIG. 12 is a flowchart of the drawing position deviation correction by the BCU / DMA unit 801 of the optical disc control apparatus according to the fifth embodiment of the present invention. The details will be described below. Note that if the drawing position deviation correction in the circumferential direction is not performed, the write frequency correction amount Q_cr may be set to zero.

  First, the writing data writing frequency Q is acquired (step 1201), and it is determined whether or not the drawing position shift amount C_dif in the circumferential direction is smaller than the threshold value Th1 (step 1202). When the drawing position shift amount C_dif in the circumferential direction is smaller than the threshold value Th1 (Yes in step 1202), it is determined that the drawing position has advanced too much, and the writing frequency Q is increased using the equation Q = Q + Q_cr (step 1203). ). At this time, the write frequency correction amount Q_cr may be changed according to the drawing position deviation amount.

  When the drawing position shift amount C_dif in the circumferential direction is larger than the threshold value Th1 (No in Step 1202), it is determined whether or not the drawing position shift amount C_dif in the circumferential direction is larger than the threshold value Th2 (Step 1204). If the drawing position shift amount C_dif in the circumferential direction is larger than the threshold Th2 (Yes in Step 1204), the writing frequency Q is lowered using the equation Q = Q−Q_cr (Step 1205). At this time, the write frequency correction amount Q_cr may be changed according to the drawing position deviation amount. Then, the writing data writing frequency is determined to be Q (step S1206).

  In the fifth embodiment, the writing data writing frequency is changed based on the circumferential drawing position shift amount detected as described in the first or second embodiment.

  As described above, according to the fifth embodiment, the BCU / DMA unit 801 changes and corrects the data transfer amount by changing the writing data writing frequency based on the detected amount of drawing position deviation in the circumferential direction. Since the writing frequency control means for performing the control is provided, there is an effect that the drawing position deviation correction process can be performed so that the detected drawing position deviation is eliminated.

  Note that when drawing position deviation correction is performed, for example, when the amount of drawing position deviation in the circumferential direction is detected, the BCU / DMA unit 801 described in the fifth embodiment draws as shown in the flow of FIG. Correction by changing the data write frequency to change the data transfer amount or performing correction control, or the servo control unit 601 as described in the third embodiment changes the optical disk rotation speed as shown in the flow of FIG. Control can be performed. Further, when the drawing position deviation amount in the radial direction and the circumferential direction is detected, the drawing data generation unit 701 as described in the fourth embodiment corrects the drawing data by thinning or adding as shown in the flow of FIG. The drawing data generation unit 405 as described in the first embodiment can perform correction control by changing the expansion rate of received data as in the flow of FIG.

(Embodiment 6)
FIG. 13: is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 6 of this invention.
The optical disc control apparatus 900 is an optical disc control apparatus that performs LS drawing processing. The configuration and operation other than the drawing data generation unit 901, the data storage unit 902, and the servo control unit 903 are the same as those of the optical disc control apparatus 400 described in the first embodiment, and a description thereof will be omitted.

  The drawing data generation unit 901 has a function of correcting drawing position deviation in addition to the function of the conventional drawing data generation unit 203. The drawing data generation unit 901 generates a drawing position deviation based on the circumferential and radial drawing position deviation amounts transmitted from the drawing position deviation detection unit 404 and the traverse control deviation amount stored in the data storage unit 902. Make corrections. Here, the drawing data generation unit 901 includes a drawing data correction unit 901a that changes correction control for the track N of the optical disc 101 in accordance with the drawing position in the radial direction calculated from the drawing position detection unit 903b of the servo control unit 903. Have.

  The servo control unit 903 controls the radial position of the laser irradiation unit 206 by the traverse control unit 903a and the traverse control unit 903a for controlling the irradiation position of the laser irradiation unit 206 in the radial direction based on the traverse control deviation amount. A drawing position detecting means 903b for detecting is provided.

  FIG. 14 is a flowchart of the drawing position deviation correction by the drawing data generation unit 901 of the optical disc control apparatus according to the sixth embodiment of the present invention, and details thereof will be described below. Note that when the drawing position deviation correction in the circumferential direction or the radial direction is not performed, the correction coefficient D_cr and the traverse control deviation amount T_cr may be set to zero.

  First, using the frequency P of received data and the frequency Q of writing data writing processing, a development magnification S is obtained (step S1401), and it is determined whether or not the drawing position deviation amount in the circumferential direction is smaller than the threshold Th1. (Step S1402). When the amount of drawing position deviation in the circumferential direction is smaller than the threshold Th1 (Yes in step S1402), it is determined that the drawing position has advanced too much, and correction for reducing the development magnification S is performed using the equation S = S−S_cr. Implement (step S1403). The development magnification correction amount S_cr may be changed according to the drawing position deviation amount.

  If the drawing position deviation amount in the circumferential direction is larger than the threshold value Th1 (No in step S1402), it is determined whether or not the drawing position deviation amount in the circumferential direction is larger than the threshold value Th2 (step S1404). If the drawing position shift amount in the circumferential direction is larger than the threshold Th2 (Yes in step S1404), it is determined that the drawing position is too late, and correction for increasing the development magnification S is performed using the equation S = S + S_cr. (Step S1405). The development magnification correction amount S_cr may be changed according to the drawing position deviation amount.

  Next, the traverse control deviation amount T_cr is acquired from the data storage unit 902 (step S1406). Here, the traverse control deviation amount T_cr is stored in advance in the data storage unit 902, and a value corresponding to the drawing position in the radial direction is acquired. Also, the traverse control deviation amount stored in the data storage unit 902 is obtained by measuring the deviation amount of the traverse control in advance. As an example of the measurement method, an ideal drawing is performed after performing a trial drawing process. There is a method of measuring the amount of deviation between the position and the drawing processing result for each fixed position in the radial direction.

  The adjacent track D_n + 1 in the outer circumferential direction is aligned with the received data D_n that is the current drawing data generation target using the equation D_n = D_n + T_cr * (A * D_n + 1) according to the drawing position deviation amount of the radial position (step) S1407). The correction amount to be adjusted is determined by the angular position information A and the traverse control deviation amount T_cr. Then, the expansion data is generated using the corrected expansion magnification S and the received data D_n (step S1408).

  The servo control unit 903 includes a drawing position reading unit 903c that detects a drawing position in the radial direction from the laser reflectance, a current drawing position in the radial direction read by the drawing position reading unit 903c, and a target drawing position. The drawing data generation unit 901 includes a radial drawing position deviation detection unit 903d that detects a deviation amount of the previous drawing process detected by the radial drawing position deviation detection unit 903d of the servo control unit 903. Based on the drawing position deviation amount storage unit 901b for storing the drawing position deviation amount and the drawing position deviation amount stored in the drawing position deviation amount storage unit 901b, drawing data for the track N of the optical disc 101 is converted to the track N It has drawing data correction means 901a generated using a track adjacent to the track N. Good. Thus, the drawing position deviation correction can be performed using the drawing position deviation amount with respect to the target drawing position at the time of past drawing processing.

  As described above, according to the fifth embodiment, the servo control unit 903 includes the traverse control unit 903a that controls the irradiation position of the laser irradiation unit 206 in the radial direction, and the radial direction of the laser irradiation unit 206 by the traverse control unit 903a. A drawing position detecting unit 903b for detecting a drawing position in the drawing data, and the drawing data correcting unit 901a of the drawing data generating unit 901 performs a correction control for the track N of the optical disc 101 with a radius calculated from the drawing position detecting unit 903b. Since the drawing position in the direction is changed, the current drawing position in the radial direction is detected based on the traverse control, and the drawing position deviation correction process is performed so that the detected drawing position deviation is eliminated. There is an effect that can be done.

  Since the present invention is one of important techniques for realizing high-speed recording of LS, it is useful for DVD recorders, DVD drives, and other optical disk drives having an LS function.

1 is a block diagram showing a configuration of an optical disc device according to a first embodiment of the present invention. 4 is a flowchart of drawing position deviation detection by a drawing position deviation detection unit 404 of the optical disc control apparatus according to the first embodiment of the present invention; 4 is a flowchart of drawing position deviation detection by a drawing position deviation detection unit 404 of the optical disc control apparatus according to the first embodiment of the present invention; 6 is a flowchart of drawing position deviation correction by a drawing data generation unit 405 of the optical disc control apparatus according to the first embodiment of the present invention; It is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 2 of this invention. 10 is a flowchart of drawing position deviation detection by a drawing position deviation detection unit 501 of the optical disc control apparatus according to the second embodiment of the present invention; It is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 3 of this invention. It is a flowchart of the drawing position shift correction | amendment by the servo control part 601 of the optical disk control apparatus concerning Embodiment 3 of this invention. It is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 4 of this invention. It is a flowchart of the drawing position shift correction by the drawing data generation part 701 of the optical disk control apparatus concerning Embodiment 4 of this invention. It is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 5 of this invention. 10 is a flowchart of drawing position deviation correction by a BCU / DMA unit 801 of an optical disc control apparatus according to a fifth embodiment of the present invention; It is a block diagram which shows the structure of the optical disk control apparatus concerning Embodiment 6 of this invention. It is a flowchart of the drawing position shift correction by the drawing data generation part 901 of the optical disk control apparatus concerning Embodiment 6 of this invention. It is a block diagram which shows the structure of the conventional optical disk control apparatus which has a LS drawing process function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Optical disk 200 Optical disk control apparatus 201 Spindle motor 202 Servo control part 203 Drawing data generation part 204 CPU
205 LDD unit 206 Laser irradiation unit 207 Write strategy unit 208 BCU / DMA unit 209 Data storage unit 210 Host data control unit 301 Host 400 Optical disk control device 401 Servo control unit 402 Synchronization signal detection unit 403 Reference counter generation unit 404 Drawing position deviation detection Unit 405 drawing data generation unit 405a expansion magnification control unit 405b drawing data correction unit 500 optical disc control unit 501 drawing position deviation detection unit 502 BCU / DMA unit 502a drawing position detection unit 600 optical disc control unit 601 servo control unit 700 optical disc control unit 701 drawing Data generation unit 800 Optical disk control device 801 BCU / DMA unit 801a Write frequency control means 900 Optical disk control device 901 Drawing data generation unit 901a Drawing data Positive means 901b drawing position shift amount storage unit 902 data storing unit 903 a servo controller 903a traverse control unit 903b drawing position detecting means 903c drawing position measuring section 903d radial drawing position shift amount detection means

Claims (38)

In an optical disc control apparatus for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
Laser irradiation means for performing laser irradiation on the optical disc;
Drawing data generating means for generating drawing data using externally received data;
Servo control means for controlling rotation of the optical disc;
Data transfer means for transferring drawing data from the drawing data generation means to the laser irradiation means;
Synchronization signal detecting means for detecting a synchronization signal at a timing for synchronizing with the optical disc;
A reference counter generating means for counting time at a constant interval and generating a count value;
Based on the detection timing of the synchronization signal detected by the synchronization signal detection means and the count value from the reference counter generation means, a drawing position deviation amount is detected.
An optical disk control device characterized by the above. The optical disk control device according to claim 1,
The reference counter generation means includes
Count time at a certain interval by a CPU having a timer circuit, and generate a count value.
An optical disk control device characterized by the above. The optical disk control device according to claim 1,
Reference clock generation means for generating a clock synchronized with the detection position expected of the synchronization signal,
Based on the detection timing of the synchronization signal detected by the synchronization signal detection means and the clock of the target timing from the reference clock generation means, a drawing position deviation amount is detected.
An optical disk control device characterized by the above. In an optical disc control apparatus for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
Laser irradiation means for performing laser irradiation on the optical disc;
Drawing data generating means for generating drawing data using externally received data;
Servo control means for controlling rotation of the optical disc;
Data transfer means for transferring drawing data from the drawing data generation means to the laser irradiation means;
Synchronization signal detecting means for detecting a synchronization signal at a timing for performing synchronization with the optical disc,
The data transfer means includes
A drawing position detecting means for detecting a current drawing data position based on a drawing data transfer amount from the drawing data generating means;
The synchronization signal detection means detects the target drawing data transfer amount at the detection timing of the synchronization signal, and calculates the drawing position shift amount based on the target drawing data transfer amount and the transfer amount up to the current drawing data position. To detect,
An optical disk control device characterized by the above. The optical disk control apparatus according to claim 4, wherein
The drawing position detecting means includes
Detecting the current drawing data position based on the drawing data amount transferred from the drawing data generating means to the laser irradiation means;
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1 and 4,
The servo control means includes
Based on the detected amount of drawing position deviation in the circumferential direction, the optical disk rotation speed is changed in a direction to reduce the amount of drawing position deviation, and correction control is performed.
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1 and 4,
The drawing data generation means includes
A drawing data control unit that performs correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount based on the detected circumferential position and radial drawing position deviation amount;
An optical disk control device characterized by the above. The optical disk control device according to claim 7, wherein
The drawing data generation means includes
Drawing data control means for performing correction control by thinning or adding the drawing data to the final drawing data of the track of the optical disc,
An optical disk control device characterized by the above. The optical disk control device according to claim 7, wherein
The drawing data control means includes:
When performing correction control by adding drawing data, use the same data as the additional part of drawing data for additional data.
An optical disk control device characterized by the above. The optical disk control device according to claim 7, wherein
The drawing data control means includes:
When correction control is performed by adding drawing data, space data is used for the addition of drawing data.
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1 and 4,
The drawing data generation means includes
Extend the received data from the outside,
Based on the detected amount of drawing position deviation in the circumferential direction and the radial direction, the expansion ratio control means for performing correction control by changing the magnification of the received data so that the amount of drawing position deviation is reduced,
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1 and 4,
The data transfer means includes
A writing frequency control means for performing correction control by changing the data transfer amount by changing the writing frequency of drawing data based on the detected drawing position deviation amount in the circumferential direction;
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1 and 4,
Selects whether to change the optical disk rotation speed, thin out or add drawing data, change the expansion rate of received data, or change the writing data writing frequency according to the detected drawing position deviation amount To
An optical disk control device characterized by the above. In an optical disc control apparatus for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
Laser irradiation means for performing laser irradiation on the optical disc;
Drawing data generating means for generating drawing data using externally received data;
Data transfer means for transferring drawing data from the drawing data generation means to the laser irradiation means,
The drawing data generation means includes
Drawing data correction means for generating and generating correction data for the track N of the optical disc using the track N and a track adjacent to the track N and performing correction control;
An optical disk control device characterized by the above. The optical disk control device according to claim 14, wherein
The drawing data correction means includes
Drawing data for the track N of the optical disc is generated using the track N and the adjacent track N + 1 in the outer circumferential direction of the track N.
An optical disk control device characterized by the above. The optical disk control device according to claim 14, wherein
Synchronization signal detecting means for detecting timing for performing synchronization with the optical disc;
The drawing data correction means is
The correction control for the track N of the optical disc is changed according to the drawing position at the detection timing of the synchronization signal of the synchronization signal detection means.
An optical disk control device characterized by the above. The optical disk control device according to claim 14, wherein
The servo control means includes
Traverse control means for controlling the irradiation position in the radial direction of the laser irradiation means;
A drawing position detecting means for detecting a drawing position in a radial direction of the laser irradiation means by the traverse control means;
The drawing data correction means includes
The correction control for the track N of the optical disc is changed according to the radial drawing position calculated from the drawing position detecting means,
An optical disk control device characterized by the above. The optical disk control device according to claim 14, wherein
The servo control means includes
Traverse control means for controlling the irradiation position in the radial direction of the laser irradiation means;
A drawing position reading means for detecting a drawing position in the radial direction from the reflectance of the laser;
A radial drawing position deviation amount detecting means for detecting a deviation amount between a current drawing position in the radial direction read by the drawing position reading means and a target drawing position;
The drawing data generation means includes
Drawing position deviation amount storage means for storing a drawing position deviation amount at the time of past drawing processing detected by the radial direction drawing position deviation amount detection means;
The drawing data correction means includes
Based on the drawing position deviation amount stored in the drawing position deviation amount storage means, drawing data for the track N of the optical disc is generated using the track N and a track adjacent to the track N.
An optical disk control device characterized by the above. In the optical disk control device according to any one of claims 1, 4, and 16,
The synchronization signal detecting means includes
Detecting a synchronization signal based on physical information embedded in the optical disc;
An optical disk control device characterized by the above. In an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
A laser irradiation step of performing laser irradiation on the optical disc;
A drawing data generation step for generating drawing data using externally received data;
A servo control step for controlling the rotation of the optical disc;
A data transfer step of transferring the drawing data generated in the drawing data generation step to the laser irradiation means;
A synchronization signal detection step of detecting a synchronization signal at a timing for performing synchronization with the optical disc;
A reference counter generation step that counts time at regular intervals and generates a count value;
Based on the detection timing of the synchronization signal detected in the synchronization signal detection step and the count value of the reference counter generation step, a drawing position deviation amount is detected.
An optical disc control method characterized by the above. The optical disk control method according to claim 20, wherein
The reference counter generation step includes
Count time at a certain interval by a CPU having a timer circuit, and generate a count value.
An optical disc control method characterized by the above. The optical disk control method according to claim 20, wherein
A reference clock generation step of generating a clock synchronized with an expected detection position of the synchronization signal;
Based on the detection timing of the synchronization signal detected in the synchronization signal detection step and the clock of the target timing of the reference clock generation step, a drawing position deviation amount is detected.
An optical disc control method characterized by the above. In an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
A laser irradiation step of performing laser irradiation on the optical disc;
A drawing data generation step for generating drawing data using externally received data;
A servo control step for controlling the rotation of the optical disc;
A data transfer step of transferring the drawing data generated in the drawing data generation step to the laser irradiation means;
A synchronization signal detection step of detecting a synchronization signal at a timing for performing synchronization with the optical disc,
The data transfer step includes:
A drawing position detecting step for detecting a current drawing data position based on the drawing data transfer amount generated in the drawing data generating means step;
The synchronization signal detection step detects the target drawing data transfer amount at the synchronization signal detection timing, and detects the drawing position shift amount based on the target drawing data transfer amount and the transfer amount up to the current drawing data position. To
An optical disc control method characterized by the above. The optical disk control method according to claim 23, wherein
The drawing position detecting step includes
Detecting the current drawing data position based on the drawing data amount transferred from the drawing data generating means to the laser irradiation means;
An optical disc control method characterized by the above. 24. The optical disc control method according to claim 20, wherein:
The servo control step includes
Based on the detected amount of drawing position deviation in the circumferential direction, the optical disk rotation speed is changed in a direction to reduce the amount of drawing position deviation, and correction control is performed.
An optical disc control method characterized by the above. 24. The optical disc control method according to claim 20, wherein:
The drawing data generation step includes:
A drawing data control step for performing correction control by thinning out or adding drawing data so as to reduce the drawing position deviation amount based on the detected circumferential position and radial drawing position deviation amount;
An optical disc control method characterized by the above. The optical disk control method according to claim 26, wherein
The drawing data generation step includes:
A drawing data control step for performing correction control by thinning or adding the drawing data to the last drawing data of the track of the optical disc;
An optical disc control method characterized by the above. The optical disk control method according to claim 26, wherein
The drawing data control step includes:
When performing correction control by adding drawing data, use the same data as the additional part of drawing data for additional data.
An optical disc control method characterized by the above. The optical disk control method according to claim 26, wherein
The drawing data control step includes:
When correction control is performed by adding drawing data, space data is used for the addition of drawing data.
An optical disc control method characterized by the above. 24. The optical disc control method according to claim 20, wherein:
The drawing data generation step includes:
Extend the received data from the outside,
An expansion magnification control step for performing correction control by changing the expansion magnification of the received data so as to reduce the drawing position displacement amount based on the detected circumferential position and radial drawing position displacement amount;
An optical disc control method characterized by the above. 24. The optical disc control method according to claim 20, wherein:
The data transfer step includes:
A writing frequency control step of performing correction control by changing the data transfer amount by changing the writing frequency of drawing data based on the detected drawing position deviation amount in the circumferential direction;
An optical disc control method characterized by the above. 24. The optical disc control method according to claim 20, wherein:
Selects whether to change the optical disk rotation speed, thin out or add drawing data, change the expansion rate of received data, or change the writing data writing frequency according to the detected drawing position deviation amount To
An optical disc control method characterized by the above. In an optical disc control method for performing visual information drawing processing on an optical disc capable of drawing visual information by laser irradiation,
A laser irradiation step of performing laser irradiation on the optical disc;
A drawing data generation step for generating drawing data using externally received data;
A data transfer step of transferring the drawing data generated in the drawing data generation step to the laser irradiation means,
The drawing data generation step includes:
A drawing data correcting step for generating drawing data for the track N of the optical disc using the track N and a track adjacent to the track N and performing correction control;
An optical disc control method characterized by the above. 34. The optical disc control method according to claim 33,
The drawing data correction step includes:
Drawing data for the track N of the optical disc is generated using the track N and the adjacent track N + 1 in the outer circumferential direction of the track N.
An optical disc control method characterized by the above. 34. The optical disc control method according to claim 33,
A synchronization signal detection step for detecting timing for performing synchronization with the optical disc;
The drawing data correction step
The correction control for the track N of the optical disc is changed according to the drawing position at the detection timing of the synchronization signal in the synchronization signal detection step.
An optical disc control method characterized by the above. 34. The optical disc control method according to claim 33,
The servo control step includes
A traverse control step for controlling the irradiation position in the radial direction of the laser irradiation means;
A drawing position detecting step for detecting a drawing position in the radial direction of the laser irradiation means controlled by the traverse control step;
The drawing data correction step includes:
The correction control for the track N of the optical disc is changed according to the radial drawing position calculated in the drawing position detecting step.
An optical disc control method characterized by the above. The optical disk control method according to claim 34, wherein
The servo control step includes
A traverse control step for controlling the irradiation position in the radial direction of the laser irradiation means;
A drawing position reading step for detecting a drawing position in the radial direction from the reflectance of the laser;
A radial drawing position deviation amount detecting step for detecting a deviation amount between a current drawing position in the radial direction read in the drawing position reading step and a target drawing position;
The drawing data generation step includes:
A drawing position deviation amount storing step for storing a drawing position deviation amount at the time of past drawing processing detected in the radial direction drawing position deviation amount detecting step;
The drawing data correction step includes:
Based on the drawing position deviation amount stored in the drawing position deviation amount storing step, drawing data for the track N of the optical disc is generated using the track N and a track adjacent to the track N.
An optical disc control method characterized by the above. 36. The optical disc control method according to claim 20, 23, 35.
The synchronization signal detecting step includes
Detecting a synchronization signal based on physical information embedded in the optical disc;
An optical disc control method characterized by the above.

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