JP2005158204A - Control method of optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of an optical disc apparatus that performs flexible and precise control according to a tilt measurement result.
A tilt measurement is performed at a specific point on an optical disk, and a recording speed is limited when a measured result value is equal to or greater than a threshold value stored in advance.
[Selection] Figure 3A

Description

  The present invention relates to a method for controlling an optical disk apparatus that records information signals by irradiating an optical disk with laser light and detects and reproduces reflected light from the optical disk.

  In an optical disc apparatus, the optical beam in the optical pickup is not perpendicular to the optical disc due to warpage of the optical disc, and the angle between the optical disc and the lens through which the optical beam passes in the optical pickup is tilted (hereinafter referred to as tilt). ) Occurs.

  As a result, the recording power is insufficient when the information signal is recorded, so that the information signal cannot be recorded accurately, and when the information signal is reproduced, the reading power is insufficient and the information signal cannot be recorded accurately.

  Therefore, it is necessary to measure the tilt and adjust the tilt so that the tilt is reduced by executing an inclination operation for tilting the optical pickup according to the measured value.

  As an optical disc apparatus, the tilt is measured at a specific point of the optical disc, and it is determined whether the measured result value is less than or equal to the allowable tilt stored in advance. When the recording operation is executed and the tilt is equal to or greater than the allowable tilt, the above-described tilting operation is executed to adjust the posture of the optical pickup and then the recording operation is already executed (see, for example, Patent Document 1).

JP 2002-260262 A

  However, if the tilt is measured at a specific point of the optical disc and the measured value is equal to or larger than the allowable tilt, the tilting operation is immediately performed to adjust the posture of the optical pickup. However, it is not possible to cope with an optical disk having a large warp during high-speed recording, and during reproduction after recording, a phenomenon occurs in which reproduction is difficult or reading is difficult.

  An object of the present invention is to provide a method of controlling an optical disc apparatus that performs flexible and precise control according to a tilt measurement result.

  Another object of the present invention is to control an optical disc apparatus that performs more flexible and precise control by adjusting a tilt measurement result in correspondence with a disc ID that identifies the supplier manufacturer, model number, and type of optical disc. Is to provide.

  According to a first aspect of the present invention, there is provided a method for controlling an optical disc apparatus, wherein a tilt measurement is performed at a specific point on an optical disc, and the recording speed is limited when a measured value is equal to or greater than a prestored threshold value. Features.

  According to a second aspect of the present invention, there is provided a method for controlling an optical disc apparatus according to the present invention. Tilt measurement at the radial position of is added, and it is determined whether the value of the additional measurement result is smaller than the second threshold value stored in advance, and if it is smaller, the value of the additional measurement result is recorded at the time of recording. If the tilt value is equal to or greater than the second threshold value, tilt measurement at another radial position of the optical disc is further added until the absolute value of the result of the additional measurement becomes smaller than the corresponding threshold value stored in advance. It is characterized by repetition.

  According to a third aspect of the present invention, there is provided a method for controlling an optical disc apparatus according to the present invention, in which tilt measurement is performed at a specific point on the optical disc, and the measured result value is equal to or greater than a first threshold value stored in advance. Tilt measurement at the radial position is added, and it is determined whether the value of the additional measurement result is smaller than the second threshold value stored in advance. If the value is smaller, the additional measurement is performed from the value of the measurement result. It is determined whether or not the absolute value of the value obtained by subtracting the result value is smaller than a third threshold value stored in advance, and if it is smaller, the value obtained by subtracting the value of the additional measurement result from the value of the measurement result Is the tilt value at the time of recording, and if it is greater than or equal to the second threshold value and greater than or equal to the third threshold value, a tilt measurement at another radial position of the optical disc is further added, and the absolute value of the result of the additional measurement And repeating until less than the corresponding threshold value stored in advance.

  According to a fourth aspect of the present invention, there is provided a control method for an optical disc apparatus, wherein tilt measurement is performed at a specific point of the optical disc, and an adjustment corresponding to the disc ID read from the optical disc is performed on the measured result.

  According to a fifth aspect of the present invention, there is provided a method for controlling an optical disc apparatus according to the present invention, wherein tilt measurement is performed at a specific point on the optical disc, and reading is performed from the optical disc when the measured value is equal to or greater than a first threshold value stored in advance. It is determined whether or not the adjustment corresponding to the disc ID is to be performed. If no adjustment is made, the value of the measurement result is set as the tilt value at the time of recording, and when adjustment is performed, the tilt measurement at another radial position of the optical disc is performed. It is determined whether the value of the additional measurement result is smaller than a second threshold value stored in advance. If the value is smaller, the value of the additional measurement result is set as a tilt value at the time of recording, If it is equal to or greater than the threshold value, tilt measurement at another radial position of the optical disc is further added, and the absolute value of the result of the additional measurement is smaller than the corresponding threshold value stored in advance. Control method for an optical disk device characterized by repeated up.

  According to a sixth aspect of the present invention, there is provided a method for controlling an optical disc apparatus according to the present invention, in which tilt measurement is performed at a specific point on the optical disc, and reading is performed from the optical disc when the measured value is equal to or greater than a first threshold value stored in advance. It is determined whether or not the adjustment corresponding to the disc ID is to be performed. If no adjustment is made, the value of the measurement result is set as the tilt value at the time of recording, and when adjustment is performed, the tilt measurement at another radial position of the optical disc is performed. Is added, and it is determined whether the value of the additional measurement result is smaller than the second threshold value stored in advance, and if it is smaller, the value obtained by subtracting the value of the additional measurement result from the value of the measurement result It is determined whether the absolute value of is less than a third threshold value stored in advance, and if so, the value obtained by subtracting the value of the additional measurement result from the value of the measurement result is recorded. If the second threshold value or more and the third threshold value or more, a tilt measurement at another radial position of the optical disc is further added, and the absolute value of the result of the additional measurement is stored in advance. It repeats until it becomes smaller than the corresponding threshold value.

  According to the present invention, it is possible to obtain a method for controlling an optical disc apparatus that performs flexible and precise control according to a tilt measurement result. Further, according to the present invention, there is provided a control method for an optical disc apparatus that performs more flexible and precise control by adjusting a tilt measurement result in correspondence with a disc ID that identifies a supplier manufacturer, a model number, and a disc type. Can be obtained.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of an embodiment of an optical disc apparatus according to the present invention. In FIG. 1, 1 is an optical disk, 2 is a disk motor, 3 is a disk motor driver, and 4 is a CPU. The disk motor driver 3 drives the disk motor 2 in response to a command from the CPU 4, thereby rotating the optical disk 1 at a predetermined speed.

  Reference numeral 5 denotes an optical pickup, which is movable in the tilt direction, tracking (optical disc radius) direction and focus (optical disc vertical) direction of the optical disc 1, and includes a laser source, a lens through which the light beam from the laser source passes, and a light receiving element. The optical disc 1 is mounted to record an information signal by irradiating the optical beam 1, and the optical beam reflected by the optical disc 1 is received and converted into an electric signal to obtain a reproduction signal.

  A preamplifier 6 amplifies the reproduction signal obtained by the optical pickup 5 and detects a focus error signal indicating a focus shift of the optical disc 1 and a tracking error signal indicating a tracking shift of the optical disc 1 from the amplified reproduction signal.

  A focus control unit 7 generates a focus drive signal from the focus error signal obtained by the preamplifier 6 and drives the focus drive unit 8 to move the optical pickup 5 in the focus direction of the optical disc 1.

  A tracking control unit 9 generates a tracking drive signal from the tracking signal obtained by the preamplifier 6 and drives the tracking drive unit 10 to move the optical pickup 5 in the tracking direction of the optical disc 1.

  A tilt drive unit 11 moves the optical pickup 5 in the tilt direction of the optical disc 1 based on a tilt measurement result measured by the CPU 4 from a reproduction signal obtained by the optical pickup 5 and amplified by the preamplifier 6.

  FIG. 2 is a flowchart showing the operation of the embodiment of the optical disc apparatus according to the present invention. This step is executed prior to the recording operation. In step 201, the CPU 4 receives the result of detecting that the optical disk 1 has been inserted by a detector (not shown), and recognizes the optical disk 1. In step 202, the CPU 4 receives a recording command from a host (not shown). Next, in step 203, the CPU 4 performs tilt measurement from the reproduction signal obtained by the optical pickup 5 and amplified by the preamplifier 6.

  Next, at step 204, the CPU 4 instructs the disk motor driver 3 to perform recording speed limitation or measurement expansion based on the tilt measurement result, and based on the instruction, the disk motor driver 3 drives the disk motor 2 to limit the recording speed. Or perform measurement expansion. Next, in step 205, the CPU 4 stores the tilt measurement result (the stored tilt measurement result is used in a later recording operation). Next, in step 206, the CPU 4 instructs a recording operation.

  As described above, the embodiment of the present invention is characterized in that the recording speed is limited or the measurement is extended based on the tilt measurement result.

  FIG. 3A is a flowchart showing the operation of the first embodiment of the optical disc apparatus according to the present invention. FIG. 3A is a flowchart showing an operation for limiting the recording speed based on the tilt measurement result in step 204 of FIG. FIG. 3B is a diagram illustrating the relationship between the radial position of the optical disc and the measured value of the disc tilt, for explanation in the operation of FIG. 3A.

  3A, the same reference numerals are assigned to the same portions as those in FIG. In step 203, the CPU 4 measures the tilt from the reproduction signal obtained by the optical pickup 5 at the radial position n of the optical disk 1 and amplified by the preamplifier 6, and sets the measured value T to T1. In the next step 301, it is determined whether or not the absolute value of the measured value T1 is smaller than a previously stored threshold value (hereinafter referred to as a threshold value) a. FIG. 3A shows a case where the measured value T1 is smaller than the threshold value a. In this case, since Yes, the process proceeds to step 205. If the measured value T1 is not smaller than the threshold value a, the result is No, so that the process proceeds to step 302 and the recording speed is limited (for example, limited to the threshold value a or less in FIG. 3B). Then, the process proceeds to Step 205.

  FIG. 4 is a diagram showing an example of the recording speed limitation in step 302 of FIG. 3A. FIG. 4 is a diagram showing an example of recording speed limitation in the zone CLV. (A) shows a normal operation, while restriction example 1 in (B) is an example of maintaining the speed after reaching a preset restriction recording speed, and restriction example 2 in (C) is data This is an example of maintaining the minimum speed at the recording start position.

  FIG. 5 is a diagram showing another example of the recording speed limitation in step 302 of FIG. 3A. FIG. 5 is a diagram showing an example of recording speed limitation in CAV. (A) shows a normal operation, while restriction example 1 in (B) is an example of maintaining the speed after reaching a preset restriction recording speed, and restriction example 2 in (C) is data This is an example of keeping the minimum speed lower than the scheduled speed at the recording start position.

  FIG. 6 is a diagram illustrating the tilt direction movement of the optical pickup 5 during the recording operation using the tilt measurement performed prior to the recording operation of FIG.

  The tilt measurement in step 203 in FIG. 2 is performed at a plurality of points by moving the optical pickup 5 in the disc radial direction. In step 204, the number of measurement points may further increase.

  FIG. 6 shows an example in which measurement is performed at four points n0, n1, n2, and n3. In step 205 of FIG. 2, the CPU 4 stores the tilt measurement positions n0, n1, n2, and n3 in the disk radial direction and the tilt values T0, T1, T2, and T3 at the positions as tilt measurement results.

  During the recording operation, the optical pickup 5 moves in the radial direction of the disk. The position of the optical pickup 5 and the tilt measurement result stored prior to recording are collated, and the tilt value interpolation calculation at the non-measurement position is performed by the CPU 4. Then, the calculated value is set as the tilt value at the non-measurement position. This makes it possible to perform flexible and precise control of the tilt drive from the recording start position of the disc during recording to the outermost peripheral position of the disc.

  FIG. 7 is a flowchart of an example of the recording operation in step 206 of FIG.

  First, in step 701, the recording start position is calculated. Next, in step 702, the initial value of tilt is set. Next, in step 703, recording is started. Next, at step 704, the position of the optical pickup 5 is detected. Next, at step 705, the CPU 4 performs tilt value interpolation calculation at the non-tilt measurement position by collating the position of the optical pickup 5 with the tilt measurement result stored prior to recording. Next, in step 706, the CPU 4 determines whether the speed is limited or decelerated by looking at the value obtained by the tilt value interpolation calculation. In the case of Yes, speed limitation or deceleration processing is performed in step 707. If No in step 706, the tilt value is set (set) in step 708.

  Next, in step 709, it is determined whether or not the recording is finished. If No, the process returns to Step 704, and if Yes, the recording ends at Step 710.

  FIG. 8A is a flowchart showing the operation of the second embodiment of the optical disc apparatus according to the present invention. FIG. 8A is a flowchart showing a tilt operation for performing measurement expansion based on the tilt measurement result in step 204 of FIG. FIG. 8B is a diagram showing a basic unit of operation repetition in FIG. 8A. FIG. 8C is a diagram showing the relationship between the radius of the optical disc and the measured value of the disc tilt for the explanation in the operation of FIG. 8A.

  In FIG. 8A, the same portions as those in FIG. In step 203, the CPU 4 performs a tilt measurement at an arbitrary point n from the reproduction signal obtained by the optical pickup 5 and amplified by the preamplifier 6, and sets the measured value as Tn. In the next step 801, it is determined whether or not the absolute value of the measured value Tn is smaller than a threshold value (hereinafter referred to as a threshold value) an stored in advance. If yes, the process proceeds to step 205. If the absolute value of the measured value Tn is, for example, the T2 value in FIG.

  In step 802, tilt measurement at another radial position n + 1 of the optical disc 1 is added. Next, in step 803, it is determined whether or not the absolute value of the value Tn + 1 as a result of the additional measurement is smaller than a previously stored threshold value (hereinafter referred to as a threshold value) an + 1. For example, if the absolute value of the value Tn + 1 as a result of the additional measurement is a T3 value in FIG. 8C, the process proceeds to step 205. For example, if the absolute value is a T4 value in FIG. 8C, the process proceeds to the next step. Add tilt measurement at other radial position n + 2.

  FIG. 8B is a diagram showing the basic unit of the operation repetition in FIG. 8A, and the step 802A corresponding to step 802 in FIG. 8A and step 803A corresponding to step 803 in FIG. The process is repeated until the value becomes smaller than a pre-stored corresponding threshold value (hereinafter referred to as a threshold value).

  FIG. 9A is a flowchart showing the operation of the third embodiment of the optical disc apparatus according to the present invention. FIG. 9A is a flowchart showing another tilt operation for performing measurement expansion based on the tilt measurement result in step 204 of FIG. FIG. 9B is a diagram showing a basic unit of operation repetition in FIG. 9A. FIG. 9C is a diagram showing the relationship between the radius of the optical disc and the measured value of the disc tilt for the explanation in the operation of FIG. 9A.

  In FIG. 9A, the same parts as those in FIG. In step 203, the CPU 4 performs tilt measurement at an arbitrary point rn from the reproduction signal amplified by the preamplifier 6, and sets the value of the measurement result as Tn. In the next step 901, it is determined whether or not the absolute value of the measured value Tn is smaller than a previously stored threshold value (hereinafter referred to as a threshold value) an. In the case of Yes, the process proceeds to step 205, and in the case where the absolute value of the measured value Tn is, for example, the T2 value in FIG. 9C, No, and the process proceeds to step 902.

  In step 902, tilt measurement at another radial position n + 1 of the optical disc 1 is added. Next, in step 903, it is determined whether or not the absolute value of the value Tn + 1 as a result of the additional measurement is smaller than a previously stored threshold value (hereinafter referred to as a threshold value) an + 1. If the absolute value of the value Tn + 1 as a result of the additional measurement is, for example, the T3 value in FIG. 8C, the result is Yes, and the process proceeds to the next step 904.

  In step 904, it is determined whether the absolute value of the value obtained by subtracting the absolute value of the additional measurement result value Tn + 1 from the measurement result value Tn is smaller than a threshold value (hereinafter referred to as a threshold value) bn stored in advance. To do. For example, in the case of the T5 value in FIG. 8C, the answer is Yes, and the process proceeds to step 205. If the result is No, the process proceeds to the next step, and tilt measurement at another radial position n + 2 of the optical disc 1 is added.

  FIG. 9B is a diagram showing the basic unit of the operation repetition in FIG. 9A, step 902A corresponding to step 902 in FIG. 9A, step 903A corresponding to step 903 in FIG. 9A, and step 904A corresponding to step 904 in FIG. 9A. Is repeated until the absolute value of the result of additional measurement becomes smaller than a corresponding threshold value (hereinafter referred to as a threshold value) stored in advance.

  FIG. 10 is a flowchart showing the operation of another embodiment of the optical disc apparatus according to the present invention. FIG. 10 is a flowchart showing an operation for adjusting the tilt measurement result based on the disc ID that identifies the supplier manufacturer, model number, and type of the optical disc recorded on the optical disc.

  The physical characteristics of the recordable optical disc, particularly the warpage amount, vary greatly depending on the management and processing technology. Therefore, there are many optical discs in the market ranging from optical discs that are greatly warped to optical discs that are hardly warped. The recordable optical disc is engraved with a disc ID that identifies the supplier manufacturer, the model number, and the type of the optical disc. Therefore, from the disc ID, it is possible to distinguish between a good quality optical disc and a bad optical disc.

  On the other hand, if the optical disc apparatus has many measurement points in the radial direction of the disc for all inserted optical discs, tilt adjustment is possible for all optical discs, but conversely it takes time to adjust. Occurs.

  Therefore, by adjusting the basic adjustment result corresponding to the disc ID, only the basic adjustment result is obtained in the case of a good quality optical disc, and the recording speed is limited or the measurement is extended in the case of a bad optical disc. , Time-efficient adjustments can be made.

  To adjust based on the disc ID recorded on the optical disc, the disc ID and adjustment method for each disc ID (no recording speed limitation or measurement expansion, both recording speed limitation, measurement expansion, recording speed limitation and measurement expansion) The disk ID table indicating any of the above is prepared in the CPU 4 in advance.

  10, the same reference numerals are assigned to the same portions as those in FIG. In step 201, the CPU 4 receives the result of detecting that the optical disk 1 has been inserted by a detector (not shown), and recognizes the optical disk 1. In step 1001, the CPU 4 instructs the optical pickup 5 to read (read) the disk ID that identifies the supplier manufacturer, the model number, and the type of the optical disk recorded on the optical disk, and extracts them by the preamplifier 6. Receive and remember.

  In step 202, the CPU 4 receives a recording command from a host (not shown). Next, at step 203, the CPU 4 measures the tilt from the reproduction signal obtained from the optical pickup 5 and amplified by the preamplifier 6.

  Next, in step 1002, the CPU 4 reads the disk ID read in step 201 and the adjustment method (recording speed limitation and measurement expansion) corresponding to each disk ID prepared in advance in the inside. The disc ID table indicating any one of recording speed limitation, measurement expansion, recording speed limitation and measurement expansion) is collated to determine whether to adjust the tilt measurement result. If No, the process proceeds to Step 205. If Yes, the process proceeds to Step 1003.

  In step 1003, the CPU 4 performs any one of the recording speed limitation, the measurement expansion, the recording speed limitation, and the measurement expansion based on the adjustment method for the disk ID. Next, in step 205, the CPU 4 stores the tilt measurement result or the adjustment result. Next, in step 206, the CPU 4 instructs a recording operation.

  As described above, according to the embodiment of the present invention, the tilt measurement result is adjusted in accordance with the disc manufacturer ID, the type and type of the optical disc recorded on the optical disc. It can be performed.

  FIG. 11 is a flowchart showing the operation of the fourth embodiment of the optical disk apparatus according to the present invention. FIG. 11 is a flowchart for adjusting the operation flow of FIG. 3A corresponding to the disc ID that identifies the supplier manufacturer, the model number, and the type of the optical disc recorded on the optical disc.

  In FIG. 11, the same reference numerals are assigned to the same portions as in FIG. 3A. In step 203, the CPU 4 performs tilt measurement from the reproduction signal obtained by the optical pickup 5 and amplified by the preamplifier 6, and T is the value of the measurement result. In the next step 301, it is determined whether or not the absolute value of the measured value T is smaller than a threshold value a stored in advance. If yes, then go to step 205, if no, go to step 1101.

  In step 1101, the CPU 4 collates a disk ID and a disk ID table prepared in advance showing the disk ID and the adjustment method corresponding to each disk ID to determine whether to adjust the tilt measurement result. To do. If No, the process proceeds to Step 205, and if Yes, the process proceeds to Step 302 to limit the recording speed. Then, the process proceeds to Step 205.

  FIG. 12A is a flowchart showing the operation of the fifth embodiment of the optical disc apparatus according to the present invention. FIG. 12A is a flowchart for making an adjustment corresponding to the disc ID that identifies the supplier manufacturer, model number, and type of optical disc recorded in the optical disc in the operation flow of FIG. 8A.

  12A, the same reference numerals are assigned to the same portions as those in FIG. 8A. In step 203, the CPU 4 measures the tilt at an arbitrary point n from the reproduction signal amplified by the preamplifier 6, and sets the result of the tilt measurement as Tn. In the next step 801, it is determined whether or not the absolute value of the measured Tn is smaller than a threshold value an stored in advance. If Yes, the process proceeds to Step 205. If No, the process proceeds to Step 1201.

  In step 1201, the CPU 4 collates a disk ID prepared in advance and showing a disk ID table indicating the adjustment method corresponding to each disk ID, and determines whether to adjust the tilt measurement result. To do. If No, the process proceeds to Step 205. If Yes, the process proceeds to Step 802.

  In step 802, tilt measurement at another radial position n + 1 of the optical disc 1 is added. Next, in step 803, it is determined whether the absolute value of Tn + 1 as a result of the additional measurement is smaller than a threshold value an + 1 stored in advance. In the case of Yes, the process proceeds to step 205, and in the case of No, the process proceeds to the next step, and tilt measurement at another radial position n + 2 of the optical disc 1 is added.

  FIG. 12B is a diagram showing the basic unit of the operation repetition in FIG. 12A, step 1201A corresponding to step 1201 in FIG. 12A, step 802A corresponding to step 802 in FIG. 12A, and step 803A corresponding to step 803 in FIG. Are repeated until the absolute value of the additional measurement result becomes smaller than the corresponding threshold value stored in advance.

  FIG. 13A is a flowchart showing the operation of the sixth embodiment of the optical disc apparatus according to the present invention. FIG. 13A is a flowchart for adjusting the operation flow of FIG. 9A corresponding to the disc ID that identifies the supplier manufacturer, the model number, and the type of the optical disc recorded on the optical disc.

  In FIG. 13A, the same reference numerals are assigned to the same portions as in FIG. 9A. In step 203, the CPU 4 measures the tilt at an arbitrary point n from the reproduction signal obtained by the optical pickup 5 and amplified by the preamplifier 6, and sets the result of the tilt measurement as Tn. In the next step 901, it is determined whether or not the absolute value of the measured result Tn is smaller than a threshold value an stored in advance. If Yes, the process proceeds to Step 205. If No, the process proceeds to Step 1301.

  In step 1301, the CPU 4 collates the disk ID and the disk ID table indicating the adjustment method corresponding to each disk ID prepared in advance, and determines whether to adjust the tilt measurement result. To do. If No, the process proceeds to Step 205, and if Yes, the process proceeds to Step 902.

  In step 902, tilt measurement at another radial position n + 1 of the optical disc 1 is added. Next, in step 903, it is determined whether or not the absolute value of Tn + 1 as a result of the additional measurement is smaller than a threshold value an + 1 stored in advance. If yes, go to the next step 904.

  In step 904, it is determined whether or not the absolute value obtained by subtracting the absolute value of the additional measurement result Tn + 1 from the measurement result Tn is smaller than a threshold value bn stored in advance. In the case of Yes, the process proceeds to step 205, and in the case of No, the process proceeds to the next step, and tilt measurement at another radial position n + 2 of the optical disk 1 is added.

  FIG. 13B is a diagram showing a basic unit of the operation repetition in FIG. 13A, step 1301A corresponding to step 1301 in FIG. 13A, step 902A corresponding to step 902 in FIG. 13A, and step 903A corresponding to step 903 in FIG. 9A. Step 904A corresponding to step 904 in FIG. 9A is used as a basic unit, and the process is repeated until the absolute value of the additional measurement result becomes smaller than the corresponding threshold value stored in advance.

  FIG. 14A is a flowchart showing the operation of the seventh embodiment of the optical disc apparatus according to the present invention. 14A, the same reference numerals are assigned to the same portions as those in FIG. 8A. In step 203, the CPU 4 measures the tilt at an arbitrary point n from the reproduction signal amplified by the preamplifier 6, and sets the result of the tilt measurement as Tn. In the next step 801, it is determined whether or not the absolute value of the measured Tn is smaller than a threshold value an stored in advance. If yes, then go to step 205; if no, go to step 1401.

  In step 1401, tilt measurement and other measurements, that is, measurements other than tilt measurement such as defocus measurement and tracking offset measurement are added at another radial position n + 1 of the optical disc 1.

  Next, in step 803, it is determined whether the absolute value of Tn + 1 as a result of the additional measurement is smaller than a threshold value an + 1 stored in advance. In the case of Yes, the process proceeds to step 205, and in the case of No, the process proceeds to the next step, and tilt measurement at another radial position n + 2 of the optical disk 1 is added.

  FIG. 14B is a diagram showing a basic unit for repeating the operation in FIG. 14A. The basic unit is step 1401A corresponding to step 1401 in FIG. 14A and step 803A corresponding to step 803 in FIG. 14A. Repeat until the value is smaller than the pre-stored corresponding threshold.

  As described above, according to the present embodiment, it is possible to obtain a control method for an optical disc apparatus that performs flexible and precise control according to the tilt measurement result. Further, according to the embodiment of the present invention, it is possible to obtain a control method for an optical disc apparatus that performs flexible and precise control in accordance with a tilt measurement result, a disc ID that identifies the supplier manufacturer, model number, and type of optical disc. .

1 is a configuration diagram of an embodiment of an optical disc device according to the present invention. 5 is a flowchart showing the operation of the embodiment of the optical disc device according to the present invention. 3 is a flowchart showing the operation of the first embodiment of the optical disc apparatus according to the present invention. It is a figure which shows the relationship between the diameter of an optical disk, and a disc tilt measured value for description in the operation | movement of FIG. 3A. It is a figure which shows an example of the recording speed restriction | limiting in step 302 of FIG. 3A. It is a figure which shows the other example of the recording speed restriction | limiting in step 302 of FIG. 3A. It is a figure explaining the tilt direction movement of the optical pick-up 5 during a recording operation using the tilt measurement performed prior to the recording operation of FIG. 3 is a flowchart of an example of a recording operation in step 206 in FIG. 2. It is a flowchart which shows operation | movement of 2nd embodiment of the optical disk apparatus based on this invention. It is a figure which shows the basic unit of the operation | movement repetition in FIG. 8A. It is a figure which shows the relationship between the radius of an optical disk, and a disc tilt measured value for description in the operation | movement of FIG. 8A. It is a flowchart which shows operation | movement of 3rd embodiment of the optical disk apparatus based on this invention. It is a figure which shows the basic unit of the operation | movement repetition in FIG. 9A. FIG. 9B is a diagram illustrating the relationship between the radius of the optical disc and the measured value of the disc tilt for explanation in the operation of FIG. 9A. It is a flowchart which shows operation | movement of other embodiment of the optical disk apparatus based on this invention. FIG. 11 is a flowchart showing the operation of the fourth embodiment of the optical disk apparatus according to the present invention. It is a flowchart which shows operation | movement of 5th Embodiment of the optical disk apparatus based on this invention. It is a figure which shows the basic unit of the operation | movement repetition in FIG. 12A. It is a flowchart which shows operation | movement of 6th Embodiment of the optical disk apparatus based on this invention. It is a figure which shows the basic unit of the operation | movement repetition in FIG. 13A. It is a flowchart which shows operation | movement of 7th Embodiment of the optical disk apparatus based on this invention. It is a figure which shows the basic unit of the operation | movement repetition in FIG. 14A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Disk motor, 3 ... Disk motor driver, 4 ... CPU, 5 ... Optical pick-up, 6 ... Preamplifier, 7 ... Focus control part, 8 ... Focus drive part, 9 ... Tracking control part, 10 ... Tracking drive 11, tilt drive unit.

Claims (6)

  A method of controlling an optical disc apparatus, comprising: measuring a tilt at a specific point of an optical disc, and limiting a recording speed when a measured result value is equal to or greater than a threshold value stored in advance.   Tilt measurement at a specific point on the optical disc, and when the measured result value is equal to or greater than the first threshold value stored in advance, a tilt measurement at another radial position of the optical disc is added, and the result of additional measurement Is determined to be smaller than a second threshold value stored in advance. If it is smaller, the value of the additional measurement result is used as a tilt value at the time of recording. A method of controlling an optical disk device, comprising: adding tilt measurement at still another radial position, and repeating until the absolute value of the result of the additional measurement becomes smaller than a corresponding threshold value stored in advance.   Tilt measurement at a specific point on the optical disc, and when the measured result value is equal to or greater than the first threshold value stored in advance, a tilt measurement at another radial position of the optical disc is added, and the result of additional measurement It is determined whether or not the value is smaller than the second threshold value stored in advance. If the value is smaller, the absolute value of the value obtained by subtracting the value of the additional measurement result from the value of the measurement result is stored in advance. A value obtained by subtracting the value of the additional measurement result from the value of the measurement result is set as a tilt value at the time of recording, and is equal to or greater than the second threshold value. If it is equal to or greater than the third threshold value, tilt measurement at another radial position of the optical disc is further added, and the additional measurement is repeated until the absolute value of the result becomes smaller than the corresponding threshold value stored in advance. Control method for an optical disk apparatus according to claim.   A method of controlling an optical disc apparatus, comprising: measuring a tilt at a specific point of an optical disc, and adjusting the measurement result corresponding to the disc ID read from the optical disc.   Tilt is measured at a specific point of the optical disc, and if the measured value is equal to or greater than a first threshold value stored in advance, it is determined whether or not to make an adjustment corresponding to the disc ID read from the optical disc, If no adjustment is made, the value of the measurement result is used as a tilt value at the time of recording. If adjustment is performed, a tilt measurement at another radial position of the optical disk is added, and the value of the additional measurement result is stored in advance. If the value is smaller than the second threshold value, the value of the additional measurement result is set as a tilt value at the time of recording. The method of controlling the optical disc apparatus is characterized by repeating the tilt measurement until the absolute value of the result of the additional measurement becomes smaller than the corresponding threshold value stored in advance. Tilt measurement at a specific point of the optical disc, and if the value of the measurement result is greater than or equal to a first threshold value stored in advance, determine whether to adjust according to the disc ID read from the optical disc, If no adjustment is made, the value of the measured result is used as the tilt value at the time of recording. If the adjustment is made, a tilt measurement at another radial position of the optical disc is added, and the value of the result of the additional measurement is stored in advance. If it is smaller, the absolute value of the value obtained by subtracting the value of the additional measurement result from the value of the measurement result is smaller than the third threshold value stored in advance. If it is smaller, a value obtained by subtracting the value of the additional measurement result from the value of the measurement result is set as a tilt value at the time of recording, and is equal to or more than the second threshold value and the third threshold value or less. In the case of the optical disk apparatus, the tilt measurement at another radial position of the optical disk is further added, and the measurement is repeated until the absolute value of the result of the additional measurement becomes smaller than the corresponding threshold value stored in advance. Method.

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