JPH0836761A - Optical recorder/reproducer - Google Patents

Abstract

PURPOSE:To obtain an optical recorder/reproducer of a low cost and high reliability by allowing it to control according to the same soft ware as that of a CPU regardless of the type of a disk drive. CONSTITUTION:At the time of energizing the power source of the optical recorder/reproducer or immediately after resetting it, a CPU 142 switches the set value of a RAM on a DSP 141 in response to the type of the software of the DSP 141, the type of the recorder/reproducer and the characteristics of a head actuator based on an apparatus information fed thereto. Then, a control system in the DSP 141 is built as to conform to individual head actuators and drives. Thus, even if the specifications or the type of the actuator are altered, the DSP 141 having the same hardware structure can be used. Thus, the DSP 141 of drive can be controlled by the same CPU 142 regardless of the type of the drive. Therefore, the low-cost optical recorder/reproducer having high productivity can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system for optically recording a signal on a recording medium (disk) using a light beam from a light source such as a laser and reproducing the recorded signal. The present invention relates to a recording / reproducing apparatus, and in particular, a light beam such as a focus servo for converging a light beam spot on a recording medium in a predetermined convergence state, and a tracking servo for accurately scanning a track on the recording medium with the light beam spot. The present invention relates to an optical recording / reproducing apparatus using a digital signal processor used for spot control.

[0002]

2. Description of the Related Art An optical recording / reproducing apparatus for recording information on or reproducing information from a disk-shaped recording medium such as an optical disk and a magneto-optical disk (hereinafter, simply referred to as a disk) is required to emit a light beam on the disk. Information is detected from the reflected light beam. Therefore, in such a device, it is necessary to accurately focus the light beam on a desired track in a predetermined state. The control of the light beam spot is performed by the disk drive controller.

The disk drive controller is a servo system including a focus servo for converging a light beam on the disk in a predetermined state, a tracking servo for accurately causing the light beam to scan a track on the disk, and the like. Equipped with a filter. In the conventional disk drive control device, such a servo system filter is constructed by a digital filter by calculation. The disk drive controller also controls a digital signal processor (hereinafter referred to as a DSP) including a digital filter, the entire disk drive including the DSP, and communication / data between the host computer of the optical recording / reproducing apparatus and the disk drive. It has two processors, a CPU that manages transfers. FIG. 10 shows the configuration of a conventional disk drive control device having a CPU and a DSP.
Shown in

The CPU 303 turns on the focus servo (FCO) to record / reproduce information in response to a request from the host computer 301 of the optical recording / reproducing apparatus.
N), commands such as tracking servo ON (TRON) are sent to the DSP 302. Upon receiving these commands, the DSP 302 operates the focus servo and the tracking servo, and thereby controls the focus actuator 131 and the tracking actuator 103 so that the light beam follows a predetermined track on the disc. Further, when the SEEK command is sent from the CPU 303, the DSP 302 drives a moving device that integrally moves the objective lens (not shown), the focus actuator 131, the tracking actuator 103 and the like in the radial direction of the disk, for example, a linear motor 304. As a result, a predetermined track on which information is recorded or reproduced is searched.

In the DSP 302, the frequency characteristics of the gain or phase of the filters used for focus servo and tracking servo are the sensitivity of moving devices such as actuators and linear motors used in disk drives, and movable parts such as resonance frequency. It is determined in consideration of the frequency characteristics of. DSP302
The software is set so that the digital filter that performs arithmetic processing according to the software has the determined frequency characteristic, and then it is made into a mask ROM.
Therefore, when the actuator or the like used for each model of the disk drive is different, the DSP cannot be commonly used among the different models, and it is necessary to provide each model with its own or dedicated DSP. Also, DS
The hardware and software of the CPU that controls P is also D
Since it has to be designed according to the SP, it is necessary to use a CPU corresponding to each DSP.

[0006]

By the way, in recent years, even in an optical recording / reproducing apparatus, as shown in FIG. 11, it is used for media conversion or backup.
There is a need for an apparatus equipped with a plurality of drives each having a head corresponding to various media such as CD, 3.5 "MO, 5" PCR, PD, MD in one housing. In such an apparatus, an independent or dedicated DSP and CPU corresponding to the characteristics of the head are provided in each drive, and a CPU for managing the entire plurality of drives is further required. Therefore, a device having such a plurality of drives becomes very expensive.

A general MO recording / reproducing apparatus or P
A recording / reproducing apparatus dedicated to one medium, such as a D recording / reproducing apparatus, has one head and one DSP for controlling the head.
And one CPU. Even in such a device, when the specifications of the head and / or the actuator are changed in order to reduce the cost or improve the characteristics, for example, when developing the model, it is necessary to change the DSP software accordingly. . But,
As described above, the DSP software is a mask ROM, so it is very difficult to change it. In order to widely and easily respond to specification changes of heads and actuators, several types of software that anticipate specification changes must be stored in advance in the ROM of the DSP, which requires a very large capacity memory. Becomes Therefore D
The cost of the SP itself has increased, and as a result, the cost of the device has increased.

The present invention has been made in view of the above circumstances, and is a low-cost and highly reliable optical system that can be controlled by the same CPU and the same software regardless of the type of disk drive. It is an object of the present invention to provide a recording / reproducing apparatus and a low-cost optical recording / reproducing apparatus equipped with a plurality of drives.

[0009]

The optical recording / reproducing apparatus of the present invention is an optical recording / reproducing apparatus for optically recording information on a recording medium or optically reproducing the information from the recording medium. A converging means for converging the light beam on the recording medium, a moving means for moving the converging means, and an amount of movement based on a signal obtained from the light beam reflected by the recording medium, The variable control means for controlling the moving means so as to move the converging means according to the amount, and the moving amount from the signal according to the characteristics of the converging means and the moving means and the characteristic of the recording medium. A main control unit that controls the variable control means so as to determine the movement amount by defining the calculation for obtaining and performing the specified calculation is provided, thereby achieving the above object.

The main control unit has first storage means for storing in advance a plurality of sets of constants each having a plurality of constants, characteristics of the converging means and the moving means, and characteristics of the recording medium. The one of the plurality of sets is selected, and the constant of the selected set is transferred to the variable control means, thereby calculating the movement amount from the signal. And means for defining

The variable control means may include second storage means for storing the constants of the set transferred from the main control section.

The variable control means stores in advance device information indicating characteristics of the converging means and the moving means.
Storage means, and the main control unit receives the device information from the third storage means of the variable control means, and based on this, the characteristics of the converging means and the moving means and the recording medium. May be determined and the one of the plurality of sets may be selected based on the determination result.

The main control unit defines the calculation according to the characteristics of the converging means and the moving means and the characteristics of the recording medium immediately after the power supply of the optical recording / reproducing apparatus is turned on, or It may be performed immediately after the type recording / reproducing apparatus is reset. The optical recording / reproducing apparatus includes a plurality of converging means, the same number of moving means as the converging means, and the same number of variable control means as the converging means, and all the variable control means have the same hardware. The main control unit is configured to provide the plurality of variable control units according to the characteristics of the moving unit and the converging unit corresponding to each of the variable control units and the characteristics of the recording medium corresponding to each of the variable control units. , One may be selected and transferred.

Another optical recording / reproducing apparatus of the present invention is an optical recording / reproducing apparatus for optically recording information on a recording medium or optically reproducing the information from the recording medium. Converging means for converging the light beam upward, moving means for moving the converging means in a focus direction perpendicular to the recording medium and a tracking direction which is a radial direction of the recording medium, and a reflecting means reflected by the recording medium. A focus movement amount and a tracking movement amount are calculated by processing a signal obtained from the light beam using a plurality of parameters, and the movement means is arranged to move according to the focus movement amount and the tracking movement amount. A variable control means for controlling, and a main control for setting the plurality of parameters according to the characteristics of the converging means and the moving means and giving the variable control means. And a means to achieve the above object by its.

The recording medium may be an optical disc.

The recording medium may be a magneto-optical disk.

The variable control means may be a digital signal processor.

The digital signal processor may include a digital filter having a variable frequency characteristic, and the plurality of constants may include a coefficient that determines the frequency characteristic of the digital filter.

The digital signal processor may include a circuit for adjusting the gain of the signal, and the plurality of constants may include the value of the gain adjusted by the circuit.

[0020]

In the optical recording / reproducing apparatus of the present invention, the electric signal obtained from the reflected light from the recording medium is processed by the variable control means for performing the calculation defined by the main control section,
Thus, control is performed so that the light beam is converged on the recording medium in a predetermined state, and control is performed so that the light beam accurately scans the track on the recording medium. The main controller is
The calculation is specified so that the processing according to the characteristics of the converging means, the moving means and the recording medium is executed. Therefore, it is not necessary to use a DSP, which has been previously defined as a calculation means according to the characteristics of the converging means, the moving means and the recording medium, as the control means as in the conventional case. As a result, regardless of the change in the characteristics caused by the change in the specifications of the converging means and the moving means, and the difference in the characteristics of the recording medium, the variable control means having the same hardware configuration and the same software configuration is used, It is possible to control so that the beam is accurately focused at a predetermined position in a predetermined focusing state, and the target track is accurately scanned.

A plurality of sets of constants are stored in advance in the main control section, and one set selected from among them according to the characteristics of the converging means, the moving means and the recording medium is given to the variable control means, It defines the calculations that the variable control means should perform. Therefore, it is possible to manage a plurality of variable control means by one main control unit. Therefore, in the recording / reproducing apparatus dedicated to one type of recording medium, even if these characteristics change due to a change in the specifications of the converging means and the moving means, the constants of the set selected according to the new characteristics are newly added. Since it is given to the variable control means by, it is not necessary to change the hardware configuration and software configuration of the variable control means itself. Therefore, the productivity of the optical recording / reproducing apparatus can be improved.

Further, in an apparatus for mounting a plurality of drives on a plurality of types of recording media, the variable control means of each drive is provided with a converging means corresponding to the variable control means.
A set of constants selected according to the characteristics of the moving means and the recording medium is given, and an optimum control system is constructed for each drive. Therefore, it is not necessary to make the configuration of each variable control unit different for each drive in advance, and the same configuration can be used. Therefore, the variable control means of each drive can be controlled by one CPU, and an optical recording / reproducing apparatus equipped with a plurality of drives can be realized at low cost.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the drawings, the same members as those in the conventional example are designated by the same reference numerals.

FIG. 1 shows an optical recording / reproducing apparatus 1 of this embodiment.
10 is a block diagram showing the configuration of a disk drive control unit No. 00. The optical recording / reproducing apparatus 100 is provided with a plurality of drives each having one head actuator and one DSP.
Managed and controlled by PU. The plurality of head actuators 1 to 5 are provided for recording / reproducing different media, and have different specifications.
Hereinafter, in this specification, the "head actuator" is
It refers to a portion including a head and an actuator for driving the head. The DSPs 6 to 10 are composed of the same hardware and software.
However, since the specifications of the head actuators 1 to 5 and the media to be recorded / reproduced are different from each other, various constants in the DSPs 6 to 10, for example, coefficients of digital filters are also different from one DSP to another.

The CPU 11 has a ROM in which a plurality of sets of constants according to the type of medium and the specifications of the head actuator are stored in advance. CPU
11 selects the optimum set for the DSP from the plurality of sets based on the information from each DSP,
Transfer to. Each DSP uses the received set of constants to determine the actual processing performed by the digital filter or the like.

The transfer of the set of constants is performed as follows. When the optical recording / reproducing apparatus 100 is turned on, the CPU 11 causes the DSPs 6 to 10 to execute REA.
A signal for confirming whether or not it is in the DY state is sent to each DSP. In the READY state, the DSPs 6 to 10 send out signals indicating the specifications of the head actuators they control and the types of corresponding media as their responses. Based on these responses, the CPU 11 transfers a set of constants including coefficient values and gain values of the filter to each DSP. CP in this way
The U11 transfers a constant corresponding to the specifications of the corresponding head actuator and the type of medium to each of the plurality of DSPs. In the present embodiment, an example will be described in which one set of constants includes a coefficient value of a filter in each DSP and a gain value.

Next, the structure and operation of one disk drive including one head and one DSP will be described with reference to FIGS. 2 and 3. In addition, the configuration and operation of other drives have different specifications of each head,
The configuration and operation of the drive described below are the same, except that the constants for changing the characteristics of the filters and circuits in the DSP are different accordingly.

FIG. 2 is a block diagram showing the configuration of one drive of the optical recording / reproducing apparatus 100.

A light beam generated from a light source 104 such as a semiconductor laser is collimated by a coupling lens 105 and reflected by a polarization beam splitter 106. The reflected light beam is converged on the optical disc 101 by the objective lens 102.

The converged light beam is reflected by the optical disc 101.
Is reflected by the collimator lens 1 and transmitted through the objective lens 102 and the polarization beam splitter 106 in this order.
It is incident on 07. The light beam is narrowed down by the collimator lens 107, and then divided into two by the half mirror 108. One of the split light beams is the photodetector 10
9 and the other is input to the photodetector 110. Photo detector 1
Both 09 and 110 are two-part photodetectors. The photodetectors 109 and 110 convert the input light beams into electric signals and output the electric signals. The electric signal from the photodetector 110 is input to the differential amplifier 115 via the preamplifiers 111 and 112, while the electric signal from the photodetector 109 is input to the differential amplifier 116 via the preamplifiers 113 and 114. To be done. Also, both photodetectors 10
The electrical signals from 9 and 110 are also input to summing amplifier 117. The output TE of the differential amplifier 115 is used as a track shift signal indicating the positional relationship between the light beam focused on the optical disc 101 and the target track,
The output FE of the differential amplifier 116 is used as a focus shift signal indicating the converged state of the light beam on the optical disc 101. Further, the output AS of the addition amplifier 117 becomes a signal representing the total amount of returned light from the optical disc 101.

These signals TE, FE and AS are DS
It is input to P141 and first attenuated to an appropriate level by attenuators 118, 119 and 120. DSP141
Performs a predetermined arithmetic processing on the signals TE and FE among these signals, and then supplies the processed signals to the tracking drive circuit 129 and the focus drive circuit 134, respectively. The tracking drive circuit 129 is D
The tracking actuator 103 is driven according to the track shift signal TE processed by SP141,
The objective lens 102 is moved in the radial direction of the disc.
In this way, the tracking servo for accurately focusing the light beam on the target track is performed. Also,
The focus drive circuit 134 drives the focus actuator 131 according to the focus shift signal FE processed by the DSP 141 to move the objective lens 102 in the direction perpendicular to the optical disc 101. In this way, focus servo is performed so that the light beam is always converged on the optical disc 101 in a predetermined converged state.

In the DSP 141, the signals TE, FE and AS from the attenuator are input to analog-digital converters (hereinafter referred to as AD converters) 121, 122 and 123, respectively. Each AD converter converts the input analog signal into, for example, an 8-bit digital value and outputs it. The focus shift signal FE output from the AD converter 122 is the filters 132, 152 and 1
After going through 33 in this order, it is input to the gain switching circuit 135 that performs gain adjustment. Here, the filter 132 is a low-pass filter that removes high-frequency noise, and the filter 15
Reference numeral 2 is a phase compensation filter for compensating the phase of the focus servo system, and filter 133 is a band elimination filter for trapping the higher-order resonance of the focus actuator 131 and securing a gain surplus. All of these filters 132, 152 and 133 are
41 is a digital filter that performs arithmetic processing by software. The gain switching circuit 135 is also composed of a multiplier, barrel shifter, or the like that similarly performs arithmetic processing according to software. The focus shift signal whose gain has been adjusted in the gain switching circuit 135 is passed through the DA converter 154 to the focus drive circuit 13
4 is output.

The track shift signal TE output from the AD converter 121 is passed through a polarity switching circuit 124 which inverts and non-inverts the tracking polarity, and the low pass filter 1
25, the phase compensation filter 151, and the band elimination filter 127 in this order, and is input to the gain switching circuit 128. The track shift signal whose gain has been adjusted in the gain switching circuit 128 is output from the DSP 141 via the DA converter 153, and the tracking drive circuit 12
Given to 9.

The signal AS converted into a digital value by the AD converter 123 is used as the sum of the light amounts from the optical disc 101. For example, by performing division by the sum of the light quantities, the signals FE and TE are
Is normalized.

FIG. 3 shows the hardware configuration of the DSP 141 and the CPU 142. As shown in FIG.
41 includes a RAM 516 and a ROM 517 for executing software. The ROM 517 stores a program coded software in a nonvolatile manner. Further, the ROM 517 stores, as device information, information indicating the version, type, etc. of the DSP, or coded information indicating the version, type, etc. of software that operates the DSP. The information indicating the DSP version and the like and the information indicating the software version and the like differ depending on the characteristics of the head actuator and the type of the medium. Therefore, the characteristics of the head actuator and the type of medium can be determined based on this device information.

As described above, the optical recording / reproducing device 10
When the power of 0 is turned on, the CPU 142 causes the FLASH
According to the program stored in the ROM 500, the constant setting operation in the DSP 141 is started. First, the control calculation unit 524 sends the READY signal to the DSP 141 via the port A. READY signal is D
It is input to the port 1 of the SP 141 and sent to the core 518. Upon receiving the READY signal, the core 518 causes the RO
According to the program stored in the M517, the device information also stored in the ROM 517 is sent to the signal VER.
Is sent from the port 2 to the CPU 142. Signal VE
R is input to the port B of the CPU 142 and is sent to the control calculation unit 524 from here. The control calculation unit 524 determines the characteristics of the head actuator and the type of the medium on which the drive records / reproduces based on the device information described above, and the FLASHROM 5 is determined according to the determination result.
One of the plurality of sets of constants including the coefficient of the digital filter stored in 00 and the switching value of the gain switching circuit is selected. The selected set of constants are sequentially transferred from the port C to the DSP 141.
The DSP 141 receives the constants sequentially transferred by the port 3, and stores them in the RAM 516. D
The SP 141 uses the constants stored in the RAM to determine the characteristics of each filter, and thereby automatically constructs the optimum control system for the characteristics of the head actuator and the characteristics of the medium.

When the transfer of the constants to the DSP 141 is completed, the CPU 142 turns on the spindle motor, the focus servo, and the tracking servo from the port A.
And other commands are sent to the DSP 141. DSP141
Activates the disk drive device in response to these commands. Further, when the disc drive apparatus is activated, the CPU 142 sends an OK signal indicating that the disc drive apparatus is activated to the host computer 501 of the optical recording / reproducing apparatus 100 via the I / F 525.

Next, setting of the characteristics of the filter and circuit of the DSP 141 using the constants transferred as described above will be described with reference to FIGS.

FIG. 4 is a block diagram showing an example of the configuration of a low pass filter. As shown in FIG. 4, the low pass filter includes a delay unit 161, a multiplier 162, and a delay unit 161, which are represented by Z ⁻¹ .
163 and adders 164 and 165. The multipliers a and b of the multipliers 162 and 163 are values that are changed according to the characteristics of the head actuator, and these values are CP.
Transferred from U142. By changing these multipliers a and b, the cutoff frequency of the low pass filter can be changed according to the characteristics of the head actuator. FIGS. 5A and 5B show, as an example, the frequency characteristics of the low-pass filter in FIG. 4 when the cutoff frequency is changed from f1 to f2.

FIG. 6 is a block diagram showing an example of the configuration of the phase compensation filter. As shown in FIG. 6, the phase compensation filter includes a delay unit 171, a multiplier 172, and a delay unit 171, which are represented by Z ⁻¹ .
173 and adders 174 and 175. The multipliers c and d of the multipliers 172 and 173 are values set by the CPU 142. By changing these multipliers c and d, it is possible to change the frequency at which the phase delay or lead becomes maximum according to the characteristics of the head actuator. FIGS. 7A and 7B show, as an example, the frequency characteristics of the phase compensation filter when the frequency at which the phase delay or lead is maximum is changed from f3 to f4.

FIG. 8 is a block diagram showing an example of the structure of the band elimination filter. As shown in FIG. 8, the band elimination filter includes delay units 181, 182, multipliers 183, 184, 185, 186 and adders 187, ¹ represented by Z ^−1.
88, 189 and 190. Multipliers 183-1
The multipliers e, f, g, h of 86 are constants set by the CPU 142. By changing these, the trap center frequency can be changed according to the characteristics of the head actuator. FIGS. 9A and 9B show, as an example, the frequency characteristics of the band elimination filter when the trap center frequency is changed from f5 to f6.

These constants that determine the characteristics of the filter are selected by the CPU 142 in accordance with the characteristics of the head actuator, as described above.
It is written in the RAM of P141. By rewriting these constants written in the RAM by the CPU 142, the characteristics of each filter of the DSP 141 can be freely changed. The configuration of each filter of the DSP 141 is not limited to the above configuration. Of course, if the processing by software is changed, the configuration of the filter can be correspondingly changed.

The gains of the gain switching circuits 128 and 135 shown in FIG. 2 are also changed according to the characteristics of the head actuator, particularly the drive sensitivity of the focus actuator, tracking actuator and linear motor. Gain switching circuits 128 and 135
Changing the gain of is similar to the case of the filter described above,
This is done by changing the multiplier of the multiplier that constitutes the circuit.

In the above-mentioned example, in order to simplify the explanation, it is transferred from the CPU 142 and is transferred to the RAM of the DSP 141.
The case where the constants set above include the filter coefficient value and the gain setting value has been described. However, in practice, constants that are set according to the type of disc are also included. One such constant is the amount of attenuation of the attenuators 118, 119 and 120. Since the discs have different reflectivities, there is a difference in the laser emission power required for reproduction or recording. Therefore, the photodetectors 109 and 11
The amount of light detected by 0 depends on the disc.
Therefore, depending on the emission power of the laser, the attenuator 11
It is necessary to change the attenuation amount of 8, 119 and 120. Further, depending on the type of disc, there are a disc that uses the land portion as a data area and a disc that uses the groove portion as a data area. Therefore, it is necessary to adapt the polarity of the polarity switching circuit 124 according to which of the land portion and the groove portion is used as the data area. The polarity may be changed by any known method. As described above, if the signal supplied to the polarity switching circuit 124 is a digital signal, the polarity can be easily changed by the process of taking the complement of 2, for example.

As described above, the CPU 142 judges the characteristics of the head actuator controlled by the DSP based on the device information received from each DSP, and sets the constants of the filters and the like in each DSP according to the judgment result. To do. For this setting, one set according to the characteristics of the head actuator is selected from a plurality of sets of constants stored in the ROM of the CPU 142 in advance, and the set constant is transferred from the CPU 142 to the RAM of each DSP. Is done by doing. As a result, the filter constant of each DSP, the gain value of the gain switching circuit, the attenuation amount of the attenuator, etc. are set to optimum values according to the characteristics of the head actuator controlled by the DSP. In this way, the CPU 142 transfers to all DSPs a set of constants according to the characteristics of the head actuators it controls. Therefore, one head and one DS
Even if a plurality of drives each having P and P are provided, it is possible to control with only one CPU. As a result, a low-cost, multifunctional optical recording / reproducing device can be realized.

Further, even when only one drive is provided, the constants of each filter of the DSP are automatically set when the optical recording / reproducing apparatus is started up as long as the apparatus information is stored in the DSP. Is set automatically. Therefore, it is not necessary to predetermine a filter or a circuit having characteristics according to the head actuator to be used in the DSP. Therefore, it is not necessary to design the hardware and software of the DSP for each head actuator having different specifications, and the DSP configured with the same hardware and software can be used for the head actuator of any specification. .

As explained above, according to the present invention, C
The PU receives the specific device information added for each drive, and based on this, sets constants for determining the characteristics of the filters and circuits in the DSP in the RAM of the DSP. As a result, the DSP automatically constructs a filter, a circuit, and the like so as to have the optimum characteristics for the characteristics of the head actuator to be controlled, and as a result, the control system in the DSP is optimized for the characteristics of the head actuator. To construct. Therefore, as before, the CPU can be changed according to the type of device (type of recording / playback target medium), version upgrade, specification change of head actuator, etc.
There is no need to rewrite the above program or the DSP program, or to replace the DSP itself, so that the productivity of the optical recording / reproducing apparatus can be greatly improved.

Further, as described above, the constants of the filters and circuits in the DSP are set by the CPU when the apparatus is started up, so it is not necessary to use a unique DSP according to the characteristics of each head actuator. A DSP having the same hardware configuration and software configuration can be used for the head actuator having such characteristics. As a result, C for controlling the DSP
There is no need to provide a PU and a CPU for managing these CPUs, and all DSPs can be processed by one CPU.
It is possible to control and manage the. Therefore, cost reduction can be achieved even in such a complex and multifunctional device.

When the characteristics of the filter and circuit in the DSP 141 are determined by the procedure as described above, then the CPU
142 starts control to start the apparatus to a state where information can be recorded / reproduced. In this control, similarly to the conventional optical recording / reproducing apparatus, the CPU 142 first
Focus servo ON (FCO
N), a series of commands such as tracking servo ON (TRON) are transmitted. Upon receiving the command, DSP1
Reference numeral 41 operates a focus servo and a tracking servo, which causes the light beam to follow a predetermined track on the disk 101. However, the sequence of sending a series of commands can be changed depending on the type of disc and the type of device. For example, when reproducing a CD or the like, it is necessary to first read the TOC area on the inner circumference. Therefore, if the head is first moved to the inner circumference at startup, the startup of the optical recording / reproducing apparatus can be performed quickly and efficiently. Also, with recordable discs,
Since the positions of the adjustment area and the control track change depending on the type of disc, a start-up procedure is performed such that the position is first moved to the outer or inner periphery according to the disc format.

When the device is manufactured, the EEPROM 14
3, the semiconductor laser 104, the coupling lens 105,
Polarization beam splitter 106, objective lens 102, collimator lens 107, half mirror 108, photodetector 1
It is also possible to write parameters such as 09 and 110 indicating the type or characteristics of the optical element included in the head, or parameters indicating the type or characteristics of the focus actuator or tracking actuator. In such a case, the CPU 142 sets the constants of the filters and circuits in the DSP 141 described above when the device is activated, and then the EEPROM 143.
Read the parameters written in. Then C
By accessing the FLASHROM or the like in the PU 142 and selecting a set of constants suitable for the set of constants previously transferred to the DSP 141 or a set of constants other than the constants already set in the DSP 141, the DSP 14
Transfer to 1. In this way, the EEPROM1
The constant set based on the device information of the DSP 141 is updated or added according to the parameter from 43. As a result, the characteristics of each filter and circuit in the DSP 141 can be adapted to the variations of the individual head actuators, and the control system in the DSP 141 can be a control system more suitable for the characteristics of the head actuator.

In particular, in the head unit manufacturing adjustment step of the apparatus manufacturing steps, the parameter indicating the adjustment value of the head at that time or the characteristic of the head is set to EEP.
If you write it in the ROM143, you can mount the completed head unit on the disk drive as it is.
The constants of each filter and circuit in the SP 141 are automatically adjusted according to the head. For this reason, after the head unit is mounted on the disk drive, it is not necessary to readjust or learn on the device side according to the head. In addition, the semiconductor laser 10 in the head unit
Even if the actuator 4 or the actuators 103 and 131 are damaged, the constants that determine the characteristics of the filters and circuits in the DSP 141 are automatically changed in accordance with the head unit after replacement by simply replacing the head unit.
No special adjustment work is required. Therefore, maintenance of the optical recording / reproducing apparatus can be performed very easily.

In the above embodiments, the present invention has been described by taking an optical recording / reproducing apparatus for recording / reproducing an optical disk as an example. However, for example, recording / reproducing is performed optically on a recording medium such as a magneto-optical disk recording / reproducing apparatus. It is needless to say that the same effect as the effect described in the above embodiment can be obtained regardless of the type of the recording medium as long as it is a device that performs the above.

Further, in the above-described embodiment, the main factors for changing the characteristics of each filter and circuit in the DSP 141 are that the characteristics of the head actuator are different and that the types of media are different. . However, if the factors that must be taken into consideration when constructing the control system of the disk drive increase, the number of sets of constants to be stored in the FLASHROM of the CPU in advance may be increased accordingly, and as described in the above embodiment. Of course, the same effect as can be obtained.

[0054]

As described above, in the optical recording / reproducing apparatus of the present invention, device information relating to the characteristics of the head actuator of each drive and the characteristics of the recording medium on which each drive records / reproduces is stored in the DSP of each drive. In addition, the CPU can use the DSP based on the device information of each drive.
The constants for determining the characteristics of the internal filters and circuits are set in the DSP RAM. As a result, the DSP
The filter, the circuit, etc. are automatically constructed so as to have the optimum characteristics for the corresponding head actuator and recording medium, and as a result, the control system in the DSP is constructed for the optimum characteristics of the head actuator. Therefore, as before, the CPU program or DSP program may be rewritten or the DSP itself may be replaced depending on the type of device (type of recording / playback target medium), version upgrade, head actuator specification changes, etc. This eliminates the need for work such as cutting and the like, which can greatly improve the productivity of the optical recording / reproducing apparatus.

The constants of the filters and circuits in the DSP described above are set by the CPU when the device is started up. Therefore, it is not necessary to use a unique DSP for each drive according to the characteristics of each head actuator and the characteristics of the recording medium. DSPs having the same hardware and software configurations can be used for head actuators of any characteristics.
As a result, the CPU for controlling the DSP and these C
It is not necessary to provide a CPU for managing the PU, and one CPU can control and manage all DSPs. Therefore, cost reduction can be achieved even in such a complex and multifunctional device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical recording / reproducing apparatus of the present invention equipped with a plurality of disk drives.

FIG. 2 is a block diagram showing a detailed configuration of a disk drive control device.

FIG. 3 is a block diagram showing a hardware configuration of a DSP and a CPU according to the present invention.

FIG. 4 is a block diagram showing an example of the configuration of a low-pass filter in the DSP of the present invention.

5 (a) and 5 (b) are diagrams showing examples of frequency characteristics of the low-pass filter of FIG. 4, respectively.

FIG. 6 is a block diagram showing an example of a configuration of a phase compensation filter in the DSP of the present invention.

7A and 7B are diagrams showing examples of frequency characteristics of the phase compensation filter of FIG. 6, respectively.

FIG. 8 is a block diagram showing an example of a configuration of a band elimination filter in the DSP of the present invention.

9 (a) and 9 (b) are diagrams showing examples of frequency characteristics of the band elimination filter of FIG. 8, respectively.

FIG. 10 is a block diagram showing a part of a configuration of a conventional disk drive control device.

FIG. 11 is a block diagram showing the configuration of a conventional device equipped with a plurality of disk drives.

[Explanation of symbols]

 1, 2, 3, 4, 5 Head actuator 6, 7, 8, 9, 10 DSP 11 CPU 100 Disk drive control device 118, 119, 120 Attenuator 121, 122, 123 AD converter 124 Polarity switching circuit 125, 132 Low pass filter 127, 133 Band stop filter 128, 135 Gain switching circuit 141 DSP 142 CPU 143 EEPROM 151, 152 Phase compensation filter 153, 154 DA converter

Claims (12)

[Claims] 1. An optical recording / reproducing apparatus for optically recording information on a recording medium or optically reproducing the information from the recording medium, comprising a converging means for converging a light beam on the recording medium. A moving unit for moving the converging unit, and a moving amount based on a signal obtained from the light beam reflected by the recording medium, and the moving unit for moving the converging unit according to the moving amount. A variable control means for controlling the means, a calculation for obtaining the movement amount from the signal according to the characteristics of the converging means and the moving means, and the characteristics of the recording medium, and the specified calculation. An optical recording / reproducing apparatus comprising: a main control unit that controls the variable control unit so as to obtain the movement amount by performing the movement. 2. The first control unit stores in advance a plurality of sets of constants, each set having a plurality of constants.
Of the storage means, the converging means and the moving means, and the characteristics of the recording medium, one of the plurality of sets is selected, and the constant of the selected set is variably controlled. Optical recording / reproducing apparatus according to claim 1, further comprising: means for transferring to the means, thereby defining the calculation for obtaining the movement amount from the signal. 3. The optical recording / reproducing apparatus according to claim 2, wherein the variable control means includes second storage means for storing the constants of the set transferred from the main control section. 4. The variable control means has third storage means for storing in advance device information indicating the characteristics of the converging means and the moving means, and the main control section of the variable control means has Receiving the device information from the third storage means, and judging the characteristics of the converging means and the moving means and the characteristics of the recording medium based on this,
The one of the plurality of sets based on a determination result
The optical recording / reproducing apparatus according to claim 2, wherein one of the two is selected. 5. The regulation of the calculation according to the characteristics of the converging means and the moving means and the characteristics of the recording medium by the main control unit is defined immediately after the power of the optical recording / reproducing apparatus is turned on, or The optical recording / reproducing apparatus according to claim 1, which is performed immediately after the optical recording / reproducing apparatus is reset. 6. The optical recording / reproducing apparatus comprises a plurality of the converging means, the same number of the moving means as the converging means, and the same number of the variable control means as the converging means. All are configured by the same hardware, the main control unit, for each of the variable control means,
Characteristics of the moving means and the converging means corresponding to the respective,
6. The optical recording / reproducing apparatus according to claim 2, wherein one of the plurality of sets is selected and transferred according to the characteristics of the recording medium corresponding to each of them. 7. An optical recording / reproducing apparatus for optically recording information on a recording medium or for optically reproducing the information from the recording medium, comprising converging means for converging a light beam on the recording medium. A moving means for moving the focusing means in a focus direction perpendicular to the recording medium and a tracking direction which is a radial direction of the recording medium; and a plurality of signals obtained from the light beam reflected by the recording medium. A variable control means for calculating the focus movement amount and the tracking movement amount by performing processing using the parameter and controlling the movement means so as to move in accordance with the focus movement amount and the tracking movement amount; An optical recording device comprising: a main control unit that sets parameters according to the characteristics of the converging unit and the moving unit and gives the variable control unit. Reproducing apparatus. 8. The optical recording / reproducing apparatus according to claim 1, wherein the recording medium is an optical disc. 9. The recording medium is a magneto-optical disk,
The optical recording / reproducing apparatus according to claim 1. 10. The optical recording / reproducing apparatus according to claim 2, wherein the variable control means is a digital signal processor. 11. The digital signal processor comprises:
11. The optical recording / reproducing apparatus according to claim 10, further comprising a digital filter having a variable frequency characteristic, wherein the plurality of constants include a coefficient that determines the frequency characteristic of the digital filter. 12. The digital signal processor comprises:
The optical recording / reproducing apparatus according to claim 10, further comprising a circuit that adjusts a gain of a signal, and the plurality of constants include a value of the gain that is adjusted by the circuit.