JP4426505B2 - Optical disc player and control method thereof - Google Patents

Description

  The present invention relates to an optical disc player that reads data stored on a disc by an optical pickup, and more particularly to a technique for preventing a situation in which reproduction performance is deteriorated or cannot be reproduced due to a change with time or an environmental change.

Conventionally, amplitude adjustment and servo gain adjustment of various signal systems obtained via an optical pickup for disk playback are all performed immediately after the disk is inserted, and playback preparation is completed at this point, which is optimal for the playback system. It is in a state. After the start of reproduction, reproduction processing is performed based on amplitude adjustment and servo gain adjustment in this preparation stage.
JP 2000-100058 A

  However, such an optimal reproduction state is not always maintained, and a change in the amplitude of each signal obtained via the pickup occurs due to a change with time or a change in environment (temperature, dust, etc.). In particular, this change is significant depending on continuous use for a long time or vibration caused by movement in a vehicle-mounted player.

  Such a change in the signal amplitude deteriorates the reading accuracy of the recording signal, and a change in the amplitude of the error signal causes a gain change in the servo system to deteriorate the reproduction performance and the defect performance. In particular, when the signal deteriorates, the minimum signal amplitude necessary for reproduction may not be obtained in the end, and the servo may come off at that time, resulting in a situation where reproduction is impossible. Further, in such a case, in order to return the reproduction performance to the same level as when the disk reproduction was started, it was necessary to stop the disk reproduction once and perform adjustment again in the conventional automatic adjustment work.

  The present invention has been proposed in order to improve the above-described problems of the prior art, and an object thereof is an optical disc player for preventing a situation in which reproduction performance is deteriorated or cannot be reproduced due to a change with time or an environmental change. And providing a control method thereof.

  In order to achieve the above object, the invention of claim 1 amplifies a data signal obtained from an optical pickup and outputs an RF signal, and generates a focus error signal or a tracking error signal from the data signal. The optical signal player includes an error signal generation circuit, an automatic adjustment circuit that automatically adjusts the amplitude of the RF signal, and a servo controller that automatically adjusts the focus servo gain and the tracking servo gain. The adjustment result is stored as a register value, the register that feeds back the adjustment result to the automatic adjustment circuit, the register value is received from the register, and this value is compared with a preset RF signal amplitude reference value. It was determined that the register value exceeds a predetermined range In addition, an adjustment is performed by the RF signal amplitude control unit that instructs the RF signal generation circuit to change the RF signal amplitude to a range that can be adjusted by the automatic adjustment circuit, and the RF signal amplitude control unit. A servo system automatic adjustment control unit for giving a command for automatic gain adjustment in the servo controller.

  The invention of claim 2 amplifies a data signal obtained from an optical pickup by an RF signal generation circuit to output an RF signal, generates a focus error signal or a tracking error signal from the data signal by an error signal generation circuit, and In an optical disk player control method in which automatic adjustment of amplitude in an RF signal is performed by an automatic adjustment circuit, automatic adjustment of focus servo gain and tracking servo gain is performed by a servo controller, and amplitude adjustment of an error signal is performed by an error signal amplitude control unit. The adjustment result obtained by the automatic adjustment by the register is stored as a register value, the adjustment result is fed back to the automatic adjustment circuit, the register value is received from the register by the RF signal amplitude control unit, and this value is set in advance. RF signal oscillation Compared with a reference value, the RF signal amplitude control unit can adjust the RF signal amplitude to the RF signal generation circuit in the automatic adjustment circuit when it is determined that the register value exceeds a predetermined range. The servo system automatic adjustment control unit issues a command for automatic gain adjustment in the servo controller when the adjustment by the RF signal amplitude control unit is performed.

  In the aspect as described above, during reproduction, the RF signal amplitude is always adjusted in two stages of the RF signal generation circuit unit and the RF signal amplitude automatic adjustment circuit, and the automatic adjustment result is used as the register value to adjust the amplitude adjustment result register. Temporarily store. Then, it is fed back to the RF signal amplitude automatic adjustment circuit and simultaneously transmitted to the RF signal amplitude control unit. In this RF signal amplitude control unit, when the register value is not within a predetermined range compared with a preset reference value, it is outside the adjustable range of the RF signal amplitude automatic adjustment circuit or can be stably adjusted. As an outside, an RF signal amplitude change command is sent to the RF signal generation circuit. In this way, upon receiving a determination that the RF signal amplitude needs to be adjusted, the servo system automatic adjustment control unit issues an automatic gain adjustment command in the servo controller. If the RF signal amplitude control unit determines that the RF signal amplitude automatic adjustment circuit is within the adjustable range, the reproduction is continued as it is. Thereby, the RF signal amplitude is always adjusted to an adjustable range, and necessary gain adjustment is performed.

  Therefore, it is possible to readjust the gain of the playback system and servo system due to changes in the signal amplitude obtained from the pickup due to changes over time and environmental changes during playback, so that the disk read state is maintained without stopping playback. , Can always recover the same playback performance. In addition, since the amplitude adjustment of the RF signal and the readjustment of the total gain of the servo system can be performed together, the adjustment range can be increased. Furthermore, as the processing performed during reproduction, the amplitude adjustment of the RF signal and the automatic adjustment of the focus gain and tracking are performed only when necessary, so that the processing burden can be minimized.

  The invention of claim 3 is an RF signal generation circuit that amplifies a data signal obtained from an optical pickup and outputs an RF signal, an error signal generation circuit that generates a focus error signal or a tracking error signal from the data signal, and In an optical disc player having an automatic adjustment circuit for automatically adjusting the amplitude of an RF signal and a servo controller for automatically adjusting a focus servo gain and a tracking servo gain, the adjustment result obtained by the automatic adjustment is stored as a register value. And a register that feeds back the adjustment result to the automatic adjustment circuit, receives the register value from the register, compares this value with a preset RF signal amplitude reference value, and the register value falls within a predetermined range. If it is determined that the frequency exceeds the RF signal generation In contrast, when adjustment is performed by the RF signal amplitude control unit instructing to change the RF signal amplitude to an adjustable range in the automatic adjustment circuit, and the RF signal amplitude control unit, the adjustment range is An adjustment range determination unit that determines whether or not the reference adjustment range is set in advance, a servo system automatic adjustment control unit that reads a gain automatic adjustment command and a result thereof in the servo controller, and each error signal An error signal amplitude control unit for adjusting the amplitude of the servo system, and when the servo system automatic adjustment control unit determines that it is within a reference adjustment range by the adjustment range determination unit, automatic gain adjustment in the servo controller And the error signal amplitude control unit determines that the servo signal is not within the reference adjustment range by the adjustment range determination unit. Instructs the automatic adjustment controller to automatically adjust the servo gain, reads the automatic adjustment result, adjusts the amplitude of each error signal based on the gain change amount obtained from the result, and further adjusts the amplitude. When the operation is performed, the adjusted servo gain is set to a gain before the adjustment.

  The invention of claim 4 amplifies a data signal obtained from an optical pickup by an RF signal generation circuit and outputs an RF signal, generates a focus error signal or a tracking error signal from the data signal by an error signal generation circuit, and In an optical disk player control method in which automatic adjustment of amplitude in an RF signal is performed by an automatic adjustment circuit, automatic adjustment of focus servo gain and tracking servo gain is performed by a servo controller, and amplitude adjustment of an error signal is performed by an error signal amplitude control unit. The adjustment result obtained by the automatic adjustment by the register is stored as a register value, the adjustment result is fed back to the automatic adjustment circuit, the register value is received from the register by the RF signal amplitude control unit, and this value is set in advance. RF signal oscillation Compared with a reference value, the RF signal amplitude control unit can adjust the RF signal amplitude to the RF signal generation circuit in the automatic adjustment circuit when it is determined that the register value exceeds a predetermined range. When the adjustment by the RF signal amplitude control unit is performed, the adjustment range determination unit determines whether the adjustment range is within a preset reference adjustment range. The servo system automatic adjustment control unit issues an automatic gain adjustment command in the servo controller when the adjustment range determination unit determines that the adjustment range is within the reference adjustment range, and the error signal amplitude control unit When it is determined by the width determination unit that it is not within the reference adjustment range, the servo system automatic adjustment control unit is instructed to automatically adjust the servo gain, and the automatic adjustment result is read. The error signal amplitude adjustment is performed based on the gain change amount obtained from the result of the above, and when the amplitude adjustment is further performed, the adjusted servo gain is set to the gain before the adjustment. And

  In the above-described aspect, the adjustment width determination unit determines whether or not the adjustment width is within the range of the reference value in response to the determination that the RF signal amplitude control unit needs to adjust the RF signal amplitude. If it is within the range of the reference value, the error signal amplitude adjustment is not necessary, and the servo system automatic adjustment control unit automatically adjusts the servo system gain and changes the signal amplitude gain corresponding to the gain change amount. . If the adjustment width is outside the range of the reference value, the error signal amplitude also needs to be adjusted, and the error signal amplitude control unit automatically adjusts the servo system gain by the servo system automatic adjustment control unit. The signal amplitude gain corresponding to the amount is changed. In addition, assuming that the double gain correction is performed by the above-described process, when the signal amplitude is changed, the servo system gain automatic adjustment is returned to the setting before the change.

  In this way, depending on the size of the adjustment range of the RF signal, by changing whether only the servo system gain adjustment or the error signal amplitude adjustment is performed, the servo gain fluctuation opportunity during signal amplitude adjustment is greatly reduced. The simplification of the operation can be realized, and the precise amplitude adjustment and the processing load can be reduced. In addition, since the technique of adjusting not only the RF signal but also the amplitude of the error signal itself and the technique of readjusting the total gain of the servo system can be performed together, the adjustment range can be increased.

  As described above, according to the present invention, it is assumed that the reproduction performance is affected by changes over time or environmental changes, and the RF signal generated from the signal obtained through the optical pickup during reproduction is used for other reproduction. Thus, it is possible to provide an optical disc player and a control method therefor that appropriately adjust the amplitude of the signal to be processed while minimizing the processing load and prevent a change in reproduction performance or a situation in which reproduction is impossible.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

[First Embodiment]
[Constitution]
First, the configuration of the first embodiment of the present invention will be described with reference to FIG. That is, the optical pickup 1 is means for optically reading the data signal recorded from the reflected light of the disk D by irradiating the disk D with a light beam. The signal obtained by amplifying the data signal obtained from 1 is RF output as a reproduction signal.

  The RF signal amplitude automatic adjustment circuit 3 performs so-called AGC (Automatic Gain Control), receives an RF signal input from the RF signal generation circuit 2, detects the amplitude of this signal, and sets it in advance. It is automatically adjusted based on the set value, and the signal level of the RF signal is always kept constant. This set value is fed back from the amplitude adjustment result register 5 described later at a predetermined timing.

  The A / D converter 4 digitally converts the RF signal automatically adjusted by the RF signal amplitude automatic adjustment circuit 3 and outputs the result to the amplitude adjustment result register 5 as an adjustment result. The amplitude adjustment result register 5 temporarily stores a register value as an automatic adjustment result input from the A / D converter 4 and feeds back the value of the adjustment result to the RF signal amplitude automatic adjustment circuit 3. It is configured as follows. Further, the amplitude adjustment result register 5 transmits the adjustment result to an RF signal amplitude control unit 9b of the control unit 9 described later.

  The error signal generation circuit 6 generates a focus error signal indicating the amount of deviation in the optical axis direction of the objective lens in the optical pickup 1 or generates a tracking error signal indicating the amount of deviation of the objective lens in the radial direction. is there. The error signal amplitude setting circuit 7 adjusts the focus error signal amplitude and the tracking error signal amplitude so that the servo can be performed. The A / D converter 8 digitally converts the error signal amplitude detected by the error signal amplitude setting circuit 7.

  The actuator 12 has a focus servo function for adjusting the movement of the optical pickup 1 in the focus direction and a tracking servo function for adjusting the movement in the tracking direction. The driver 11 is means for driving the actuator 12 and the spindle motor 13. The servo controller 10 controls the driver 11 and includes an automatic focus adjustment unit and an automatic tracking adjustment unit, and is a means for automatically adjusting the gain amount of the servo system.

  Furthermore, the present embodiment includes a control unit 9. The control unit 9 includes a set value storage unit 9a, an RF signal amplitude control unit 9b, and a servo system automatic adjustment control unit 9d. The set value storage unit 9 a stores in advance a reference value for determination for keeping the RF signal amplitude within an adjustable range in the RF signal amplitude automatic adjustment circuit 3. Various setting of this reference value can be considered. For example, the reference value itself may be set as a threshold value indicating an adjustable range. In consideration of the possibility of making an erroneous determination near the upper and lower limits of the adjustable range, the reference value itself may be set as a threshold value indicating a value inside the adjustable range. The reference value itself may be a value indicating an adjustable range, and the reference value may be separated from the threshold value based on the reference value so that the threshold value is a value that is a predetermined value inside. That is, the “predetermined range” in the claims and the present embodiment is a range that can be determined by comparison with the reference value, and means a range in which the RF signal amplitude automatic adjustment circuit 3 can be stably adjusted. This includes not only a range that matches the adjustable range, but also a range that is likely to exceed the adjustable range. The RF signal amplitude control unit 9b receives the reference value stored in the set value storage unit 9a and the register value as the adjustment result stored in the amplitude adjustment result register 5, and compares them to determine the register value. It is determined whether or not it is within a predetermined range.

  Then, when it is determined that the register value is outside the predetermined range, the RF signal amplitude control unit 9b changes the amplification factor setting of the RF signal generation circuit 2 and is within the adjustment range of the RF signal amplitude automatic adjustment circuit 3. The RF signal generation circuit 2 is set so as to output an RF signal amplitude change command. The servo system automatic adjustment control unit 9d outputs a servo system gain automatic adjustment command to the servo controller when the RF signal amplitude control unit 9b determines that the register value is outside a predetermined range.

[Action]
The operation of the present embodiment configured as described above will be specifically described. First, when the disc D is inserted, the disc D is detected and the type is discriminated, and then the reproduction preparation operations such as focus search and focus servo by the optical pickup 1 are performed, and the TOC recorded on the disc D is recorded. Data can be read. Then, after the TOC data is read, the reproduction process is started. During reproduction, the amplitude of the RF signal in the RF signal generation circuit 2 and the RF signal amplitude automatic adjustment circuit 3 is always adjusted by the amplitude automatic adjustment function.

  The RF signal adjusted by the amplitude automatic adjustment function as described above is digitally converted by the A / D converter 4 and output to the amplitude adjustment result register 5 as an adjustment result register value. The amplitude adjustment result is temporarily stored as a register value in the amplitude adjustment result register 5 and fed back to the RF signal amplitude automatic adjustment circuit 3. At the same time, this register value is transmitted to the RF signal amplitude controller 9b.

  Next, the process of the control part 9 is demonstrated using the flowchart of FIG. The RF signal amplitude control unit 9b that has received the adjustment result register value first reads this data (step 201), and then uses this adjustment result register value as a reference for the RF signal amplitude stored in advance in the set value storage unit 9a. When the register value is within a predetermined range, that is, within a range that can be stably adjusted by the RF signal amplitude automatic adjustment circuit 3, reproduction is continued as it is (YES in step 202).

  On the other hand, when the register value is outside the predetermined range, the RF signal amplitude control unit 9b determines that the RF amplitude in the RF signal generation circuit 2 is excessive or insufficient (NO in step 202). Based on this, it is assumed that the output of the RF signal generation circuit 2 may be outside the adjustable range of the RF signal amplitude automatic adjustment circuit, and the amplification factor setting of the RF signal generation circuit unit is changed within the adjustment range. Is sent from the RF signal amplitude controller 9b to the RF signal generation circuit 2 (step 203).

  As described above, when it is necessary to change the RF signal amplitude, the focus servo gain and the tracking servo gain need to be adjusted, so that the gains of the focus servo and tracking servo are readjusted. That is, the servo system automatic adjustment control unit 9d issues an automatic gain adjustment command to the focus signal automatic adjustment unit and the tracking signal automatic adjustment unit of the servo controller 10 (steps 204 and 205). The above processing is repeated during playback (RET).

[effect]
As described above, in the present embodiment, during reproduction, the RF signal amplitude is always adjusted in two stages of the RF signal generation circuit 2 and the RF signal amplitude automatic adjustment circuit 3, and the automatic adjustment result is used as the register value for the amplitude. Temporarily stored in the adjustment result register 5. Then, it is fed back to the RF signal amplitude automatic adjustment circuit 3 and simultaneously transmitted to the RF signal amplitude control unit 9b. In the RF signal amplitude control unit 9b, when the register value is compared with a preset reference value, when the RF signal amplitude automatic adjustment circuit 3 is out of the adjustable range or when the possibility of going out of the range is high Performs an amplitude adjustment by sending an RF signal amplitude change command to the RF signal generation circuit 2. When amplitude adjustment is performed in this way, automatic adjustment of the focus gain and tracking gain is also performed.

  Therefore, even when the signal amplitude obtained from the pickup changes due to changes over time or changes in the environment during playback, the gain of the playback system and servo system can be readjusted, so that the disk read state can be read without stopping playback. The same playback performance can always be recovered while maintaining Further, in the present embodiment, since the technique for adjusting the amplitude of the RF signal itself and the technique for readjusting the total gain of the servo system can be performed together, the adjustment range can be increased. Furthermore, as the processing performed during playback, the amplitude adjustment of the RF signal is performed only when necessary, and only the automatic adjustment of the focus gain and tracking is performed accompanying this, so the processing burden is minimized. To the limit.

[Second Embodiment]
[Constitution]
First, the configuration of the second embodiment of the present invention will be described with reference to FIG. That is, the present embodiment is basically the same configuration as the first embodiment. However, in the present embodiment, the control unit 9 includes an adjustment width determination unit 9e and an error signal amplitude control unit 9c. In addition, a reference adjustment range is stored in advance in the set value storage unit 9a. The reference adjustment width is a value serving as a reference as to whether or not the adjustment width of the RF signal amplitude control unit 9b is a size that is necessary until the amplitude adjustment of the error signal.

  When the RF signal amplitude control unit 9b determines that the register value is out of the predetermined range and the adjustment is made, the adjustment width determination unit 9e stores the reference adjustment stored in the setting value storage unit 9a. It is determined whether it is within the width. The error signal amplitude control unit 9c determines that the error signal amplitude also deviates from the optimum value when the adjustment width determination unit 9e determines that the error is outside the reference adjustment range, and the focus error amplitude and tracking error are determined. A means for adjusting each of the amplitudes.

  Specifically, an automatic adjustment command for servo system gain such as focus gain and tracking gain is sent to the servo system automatic adjustment control unit 9d, and the servo system automatic adjustment control unit 9d sends the servo system automatic adjustment control unit 9d. The error signal amplitude setting circuit 7 is instructed to change the gain corresponding to the gain change amount that has been confirmed to be excessive or insufficient before and after the adjustment based on the automatic adjustment result.

[Action]
The operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG. Note that description of the same processing as in the first embodiment is omitted. That is, the RF signal amplitude control unit 9b compares the adjustment result register value with the reference value of the RF signal amplitude stored in advance in the set value storage unit 9a, and if the register value is outside the predetermined range, The signal amplitude control unit 9b determines that the RF amplitude in the RF signal generation circuit 2 is excessive or insufficient (NO in Step 402). Based on this, it is assumed that the output of the RF signal generation circuit 2 may be outside the adjustment range of the RF signal amplitude automatic adjustment circuit, and the amplification factor setting of the RF signal generation circuit unit is changed within the adjustment range. A command is sent from the RF signal amplitude controller 9b to the RF signal generation circuit 2 (step 403).

  The adjustment width determination unit 9e compares the RF signal adjustment width by the RF signal amplitude control unit 9b with the reference adjustment width stored in the set value storage unit 9a. It is determined that the amplitude adjustment of the error signal and tracking error signal is unnecessary (NO in step 404). Then, readjustment of focus servo gain and tracking servo gain is performed. That is, the servo system automatic adjustment control unit 9d issues an automatic gain adjustment command to the focus signal automatic adjustment unit of the servo controller 10 (steps 405 and 406).

  On the other hand, if the adjustment width of the RF signal is larger than the reference adjustment width, it is determined that not only the focus servo gain and tracking servo gain but also the amplitude adjustment of the focus error signal and tracking error signal is necessary (in step 404). YES). Then, the servo gain is automatically adjusted and the focus error amplitude and the tracking error amplitude are adjusted by the following processing (steps 407 to 416).

  That is, the error signal amplitude control unit 9c sends a focus gain automatic adjustment command to the servo system automatic adjustment control unit 9d (step 407). Then, the servo system automatic adjustment control unit 9d issues a gain automatic adjustment command and a read command for the result to the focus signal automatic adjustment unit of the servo controller 10 (step 408).

  Next, the servo system automatic adjustment control unit 9d receives the automatic adjustment result read by the servo controller 10, confirms the amount of gain that has become excessive before and after adjustment, and sets an error corresponding to the amount of change as an error. Report to the signal amplitude controller 9c. Then, the error signal amplitude control unit 9c issues a command for changing the gain corresponding to the change amount to the error signal amplitude setting circuit 7 (step 409).

  Here, with the above processing, the gain of the focus servo system becomes an apparent optimum value, but in reality, the gain of the focus signal automatic adjustment unit is increased by the amount that the focus error signal amplitude is small or large. The overall gain is merely optimal. If this is the case, for example, if the focus error amplitude becomes too small, there is a possibility that the adjustment range of the automatic adjustment unit will be outside or that the focus servo itself will be uncontrollable.

  Therefore, in this embodiment, as described above, the gain is corrected twice by changing the excess or deficiency of the focus error signal amplitude according to the result of the focus gain automatic adjustment performed by the servo controller. In order to correct, the following processing for resetting the change in focus gain automatic adjustment is performed.

  First, the error signal amplitude control unit 9c checks whether or not the focus error amplitude adjustment has been performed in the error signal amplitude setting circuit 7 (step 410). If it can be confirmed, the fact is sent to the servo system automatic adjustment control unit 9d, and in this servo system automatic adjustment control unit 9d, as described above, in order to reset the change in the focus gain automatic adjustment, the focus gain Is set to the state before adjustment (step 411). On the other hand, if it cannot be confirmed, the double gain adjustment or change as described above is not performed, so that it is not necessary to reset the focus gain. Therefore, in this case, the process proceeds to step 412 without going through step 411.

  The processing performed on the focus servo system as described above is also performed on the tracking servo system. That is, the error signal amplitude control unit 9c first sends a tracking gain automatic adjustment command to the servo system automatic adjustment control unit 9d (step 412). Then, the servo system automatic adjustment control unit 9d issues a gain automatic adjustment command and a read command for the result to the tracking signal automatic adjustment unit of the servo controller 10 (step 413).

  Next, the servo system automatic adjustment control unit 9d receives the automatic adjustment result read by the servo controller 10, confirms the amount of gain that has become excessive before and after adjustment, and changes the gain corresponding to the amount of change. An instruction to execute is made to the error signal amplitude setting circuit 7 (step 414).

  In this case as well, as described above, the gain is double corrected by changing the excess or deficiency of the tracking error signal amplitude according to the result of the automatic adjustment of the tracking gain by the servo controller. The following processing is performed to reset

  First, in the error signal amplitude control unit 9c, it is confirmed whether or not the tracking error amplitude adjustment by the error signal amplitude setting circuit 7 has been executed (step 415). If it can be confirmed, the fact is sent to the servo system automatic adjustment control unit 9d, and the servo system automatic adjustment control unit 9d resets the change in the tracking gain automatic adjustment as described above. Is set to the state before adjustment (step 416). On the other hand, if it is not confirmed, the double gain adjustment or change as described above is not performed, and therefore it is not necessary to reset the tracking gain. Therefore, in this case, the process of step 416 is not performed. The above processing is repeated during playback (RET).

[effect]
According to the present embodiment as described above, only when the error signal amplitude needs to be adjusted based on the determination by the adjustment width determination unit 9e, the error signal amplitude control unit 9c performs servo control by the servo system automatic adjustment control unit 9d. The system gain is automatically adjusted, and a gain change corresponding to the gain change amount is performed in the error signal amplitude setting circuit 7. In addition, assuming that the double gain correction is performed by the above-described process, when the signal amplitude is changed, the servo system gain automatic adjustment is returned to the setting before the change.

  As described above, the processing is branched depending on whether the processing is completed only by the automatic adjustment of the servo gain or the adjustment of the amplitude of the error signal as well as the servo gain according to the adjustment width of the RF signal. As a result, the chance of significant servo gain fluctuation during signal amplitude adjustment is reduced, and the actual operation is simplified. Therefore, as a process performed during reproduction, it is possible to minimize the processing load while realizing precise amplitude adjustment.

  In the present embodiment, not only the RF signal but also the method of adjusting the amplitude of the error signal itself and the method of readjusting the total gain of the servo system can be performed together. It becomes possible to do.

  In the above embodiment, the reference value used as a reference for determination, the specific value and range of the adjustment range, etc. can be changed as appropriate according to the specifications of the device and disk, individual differences, etc. It is not limited. As described above, a reference value or range itself may be used as a threshold value, or a value that is a predetermined value from the reference value or range may be used as a threshold value. It is free to include or not to include the threshold value in the comparison judgment with the threshold value.

The system block diagram which shows the structure of the 1st Embodiment of this invention. The flowchart which shows an example of the process sequence in the 1st Embodiment of this invention. The system block diagram which shows the structure of the 2nd Embodiment of this invention. The flowchart which shows an example of the process sequence in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical pick-up 2 ... RF signal generation circuit 3 ... RF signal amplitude automatic adjustment circuit 4, 8 ... A / D conversion part 5 ... Amplitude adjustment result register 6 ... Error signal generation circuit 7 ... Error signal amplitude setting circuit 9 ... Control part 9a ... Set value storage unit 9b ... RF signal amplitude control unit 9c ... Error signal amplitude control unit 9d ... Servo system automatic adjustment control unit 9e ... Adjustment width determination unit 10 ... Servo controller 11 ... Driver 12 ... Actuator 13 ... Spindle motor D ... disk

Claims (4)

An RF signal generation circuit that amplifies a data signal obtained from an optical pickup and outputs an RF signal, an error signal generation circuit that generates a focus error signal or a tracking error signal from the data signal, and automatic adjustment of amplitude in the RF signal In an optical disc player comprising an automatic adjustment circuit for performing the adjustment and a servo controller for automatically adjusting the focus servo gain and the tracking servo gain,
A register that stores the adjustment result of the automatic adjustment as a register value, and a register that feeds back the adjustment result to the automatic adjustment circuit;
When the register value is received from the register and compared with a preset RF signal amplitude reference value, and it is determined that the register value exceeds a predetermined range, the RF signal generation circuit An RF signal amplitude control unit for instructing to change the RF signal amplitude to an adjustable range in the automatic adjustment circuit;
A servo system automatic adjustment control unit that issues a command for automatic gain adjustment in the servo controller when adjustment is performed by the RF signal amplitude control unit;
An optical disc player comprising: A data signal obtained from the optical pickup is amplified by an RF signal generation circuit and an RF signal is output. A focus error signal or a tracking error signal is generated from the data signal by an error signal generation circuit, and the amplitude of the RF signal is automatically adjusted. In the control method of the optical disc player in which the automatic adjustment circuit performs automatic adjustment of the focus servo gain and the tracking servo gain by the servo controller, and the error signal amplitude control unit performs the error signal amplitude adjustment.
The adjustment result of the automatic adjustment by a register is stored as a register value, and the adjustment result is fed back to the automatic adjustment circuit,
An RF signal amplitude control unit receives the register value from the register, compares this value with a preset RF signal amplitude reference value,
When the RF signal amplitude control unit determines that the register value exceeds a predetermined range, the RF signal amplitude control unit changes the RF signal amplitude to a range that can be adjusted by the automatic adjustment circuit with respect to the RF signal generation circuit. Direct,
The servo system automatic adjustment control unit issues a command for automatic gain adjustment in the servo controller when the adjustment by the RF signal amplitude control unit is performed. An RF signal generation circuit that amplifies a data signal obtained from an optical pickup and outputs an RF signal, an error signal generation circuit that generates a focus error signal or a tracking error signal from the data signal, and automatic adjustment of amplitude in the RF signal In an optical disc player comprising an automatic adjustment circuit for performing the adjustment and a servo controller for automatically adjusting the focus servo gain and the tracking servo gain,
A register that stores the adjustment result of the automatic adjustment as a register value, and a register that feeds back the adjustment result to the automatic adjustment circuit;
When the register value is received from the register and compared with a preset RF signal amplitude reference value, and it is determined that the register value exceeds a predetermined range, the RF signal generation circuit An RF signal amplitude control unit for instructing to change the RF signal amplitude to an adjustable range in the automatic adjustment circuit;
An adjustment width determination unit that determines whether or not the adjustment width is within a preset reference adjustment width when adjustment is performed by the RF signal amplitude control unit;
Servo system automatic adjustment control unit for reading the gain automatic adjustment command and the result in the servo controller;
An error signal amplitude control unit for adjusting the amplitude of each error signal;
With
The servo system automatic adjustment control unit is set to issue a command for automatic gain adjustment in the servo controller when the adjustment range determination unit determines that the servo system automatic adjustment control unit is within a reference adjustment range,
The error signal amplitude control unit instructs the servo system automatic adjustment control unit to automatically adjust servo gain when the adjustment width determination unit determines that it is not within a reference adjustment range, and the automatic adjustment. Read the result, adjust the amplitude of each error signal based on the gain change amount obtained from this result, and if this amplitude adjustment is performed, set the adjusted servo gain to the gain before adjustment An optical disc player configured to A data signal obtained from the optical pickup is amplified by an RF signal generation circuit and an RF signal is output. A focus error signal or a tracking error signal is generated from the data signal by an error signal generation circuit, and the amplitude of the RF signal is automatically adjusted. In the control method of the optical disc player in which the automatic adjustment circuit performs automatic adjustment of the focus servo gain and the tracking servo gain by the servo controller, and the error signal amplitude control unit performs the error signal amplitude adjustment.
The adjustment result of the automatic adjustment by a register is stored as a register value, and the adjustment result is fed back to the automatic adjustment circuit,
An RF signal amplitude control unit receives the register value from the register, compares this value with a preset RF signal amplitude reference value,
When the RF signal amplitude control unit determines that the register value exceeds a predetermined range, the RF signal amplitude control unit changes the RF signal amplitude to a range that can be adjusted by the automatic adjustment circuit with respect to the RF signal generation circuit. Direct,
The adjustment range determination unit determines whether or not the adjustment range is within a preset reference adjustment range when the adjustment by the RF signal amplitude control unit is performed,
When the servo system automatic adjustment control unit determines that the adjustment range determination unit is within the reference adjustment range, the servo system automatic adjustment control unit issues an automatic gain adjustment command in the servo controller,
The error signal amplitude control unit instructs the servo system automatic adjustment control unit to automatically adjust servo gain when the adjustment width determination unit determines that it is not within a reference adjustment range, and the automatic adjustment. Read the result, adjust the amplitude of each error signal based on the gain change amount obtained from this result, and if this amplitude adjustment is performed, set the adjusted servo gain to the gain before adjustment An optical disc player control method comprising:

Images