JPH09212881A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the offset correction of drivers of a focusing control circuit, a tracking control circuit and a linear motor control circuit respectively with reduction of an adjusting volume and with no adjustment of the volume, and then to reduce the cost of parts and the control time. SOLUTION: Reference signals are inputted to the drivers of focusing control circuit 27, a tracking control circuit 28 and a linear motor control circuit 8 respectively when a power is applied, the current flowing to the corresponding coil from every driver and the potential difference caused between both ends of a sensing resistance connected in series to the coil are taken as the offset value, and the digital offset value is stored in a memory 34. When the focusing, tracking and seeking operations are carried out, the detected offset value is read out of the memory 34 and added to the driver of every control circuit, thereby, the output offset of every driver is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording data on an optical disk and reproducing recorded data, and an offset correction method therefor.

[0002]

2. Description of the Related Art Conventionally, an optical disk device for recording data on an optical disk having a recording track or reproducing data recorded on the optical disk is practically used by a light beam output from a semiconductor laser mounted on an optical head. Has been converted.

In such an optical disk device, tracking control and focusing control are performed as positioning control of the light beam with respect to the optical disk, and movement control of a linear motor that moves the optical head in accordance with a seek operation is performed. .

The tracking control and the focusing control are servo control performed according to the tracking error signal and the focusing error signal obtained from the photodetector in the optical head. Further, the movement control of the linear motor is performed according to the tracking error signal during the tracking operation, and is performed according to the current speed of the linear motor and the speed instructed by the control unit during the seek operation. It is controlled. In each of the control circuits described above, a driver IC is used to control a target drive coil or linear motor.

In each control circuit in the optical disk device as described above, a volume is added to the circuit of the driver IC and the volume is adjusted in order to reduce the error of the servo control caused by the offset of the driver IC. The offset was corrected.

However, in each control circuit in the above-mentioned optical disk device, since the volume is used as a means for correcting the offset of the driver IC, there is a drawback that component cost and adjustment time are required.

[0007]

As described above, in each control circuit in the optical disk device, since the volume is used as a means for offset correction of the driver, there is a drawback that component cost and adjustment time are required. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical disk device as a means for correcting an offset of a driver, which eliminates the need for volume adjustment and volume adjustment, and can reduce component cost and adjustment time.

[0009]

SUMMARY OF THE INVENTION The optical disk device of the present invention is a light condensing means for condensing a light beam on an optical disk having spiral or concentric recording tracks. When the reflected light from the optical disc is irradiated and the converging means is moved by the moving means, the first detecting means for outputting an electric signal according to the amount of received light, Moving means for moving in the axial focusing direction, output means for outputting a focusing error signal indicating position information of the light beam in the focusing direction based on the detection result of the first detecting means, and this output means By controlling the operation of the moving means based on the focusing error signal by Control means for moving the light beam following in the focusing direction with respect to the recording track; second detection means for detecting an offset value in the moving means by outputting a reference signal to the control means when the power is turned on; According to the offset value detected by the second detection means, it is composed of a correction means for correcting the follow-up movement of the light beam in the focusing direction with respect to the recording track by the control means.

In the optical disk device of the present invention, a condensing means for condensing a light beam on an optical disk having spiral or concentric recording tracks, and the reflected light from the optical disk by the light beam of the condensing means is generated. First detection means for outputting an electric signal according to the amount of light received when the focusing means is irradiated and is moved by the moving means, and a light beam by the focusing means is tracked orthogonally to the track. Moving means for moving in the direction, output means for outputting a tracking error signal indicating position information of the light beam in the tracking direction based on the detection result of the first detecting means, and the tracking error signal by the outputting means. By controlling the operation of the moving means to move the light beam by the condensing means,
Control means for moving the light beam following in the tracking direction with respect to the recording track; second detection means for detecting an offset value in the moving means by outputting a reference signal to the control means when the power is turned on; The correction unit is configured to correct the follow-up movement of the light beam in the tracking direction by the control unit according to the offset value detected by the second detection unit.

In the optical disk device of the present invention, a condensing means for condensing a light beam on an optical disk provided with a spiral or concentric recording track, and the condensing means irradiates the recording medium of the optical disk with the light beam. Corresponding to the determining means for determining the position, the first detecting means for detecting the moving speed of the condensing means moved by the moving means, the instructing means for instructing the movement ending position of the condensing means, and the number of remaining tracks. When the storage means for storing the reference speed signal of the light collecting means and the light collecting means by the moving means are moved, the current position determined by the determining means and the target position indicated by the instructing means are set. Reading means for reading a reference speed signal corresponding to the number of remaining tracks from the storage means, and the light condensing detected by the first detecting means. A control means for controlling the moving speed of the light collecting means by the moving means by the moving speed of the stage and the reference speed signal read by the reading means, and by outputting a reference signal to the control means when the power is turned on. A second detecting means for detecting an offset value of the moving means, and a correcting means for correcting the moving speed of the light collecting means by the control means in accordance with the offset value detected by the second detecting means. Composed of.

In the optical disk device of the present invention, a condensing means for condensing a light beam on an optical disk having spiral or concentric recording tracks, and the reflected light from the optical disk due to the light beam of this condensing means A first detection unit that outputs an electric signal according to the amount of light received when the irradiation unit is irradiated and the moving unit moves the focusing unit, and the focusing unit sets the focusing direction in the optical axis direction of the light beam. First moving means for moving to the first moving means, first output means for outputting a focusing error signal indicating position information in the focusing direction of the light beam based on the detection result of the first detecting means, and the first output means. Controlling the operation of the first moving means on the basis of the focusing error signal from the output means of FIG. Ri, first made to follow the movement of the light beam to Four cut single direction relative to the recording track
Position of the light beam in the tracking direction based on the detection result of the control means, the second moving means for moving the light beam by the condensing means in the tracking direction orthogonal to the track, and the first detecting means. Second output means for outputting a tracking error signal indicating information, and the second output means based on the tracking error signal by the second output means.
Second control means for moving the light beam in the tracking direction with respect to the recording track by controlling the operation of the moving means for moving the light beam by the condensing means. , By outputting the reference signal to the second control means, respectively,
According to the second detecting means for detecting the respective offset values of the first and second moving means, and the offset value of the first moving means detected by the second detecting means, The follow-up movement of the light beam in the focusing direction with respect to the recording track by the first control means is corrected, and according to the offset value of the second movement means detected by the second detection means, The second control means comprises a correction means for correcting the following movement of the light beam in the tracking direction with respect to the recording track.

In the optical disk device of the present invention, a condensing means for condensing a light beam on an optical disk having spiral or concentric recording tracks, and the reflected light from the optical disk due to the light beam of this condensing means A first detection unit that outputs an electric signal according to the amount of light received when the irradiation unit is irradiated and the moving unit moves the focusing unit, and the focusing unit sets the focusing direction in the optical axis direction of the light beam. Moving means for moving to the first detecting means, an output means for outputting a focusing error signal indicating position information of the light beam in the focusing direction based on the detection result of the first detecting means, and the focusing error by the outputting means. By controlling the operation of the moving means by the output of the driver based on the signal to move the light beam by the condensing means. Control means for moving the light beam in the focusing direction with respect to the recording track, a sensing resistor inserted in the output of the driver for detecting a current flowing in the moving means, and a reference for the driver when the power is turned on. By outputting a signal, a second detecting means for detecting the voltage value by the sensing resistor as an offset value, and a driver for the recording track by the driver according to the offset value detected by the second detecting means. It is composed of a correction means for correcting the follow-up movement of the light beam in the caching direction.

In the optical disk device of the present invention, a condensing means for condensing a light beam on an optical disk having spiral or concentric recording tracks, and the reflected light from the optical disk due to the light beam of the condensing means. First detection means for outputting an electric signal according to the amount of light received when the focusing means is irradiated and is moved by the moving means, and a light beam by the focusing means is tracked orthogonally to the track. Moving means for moving in the direction, output means for outputting a tracking error signal indicating position information of the light beam in the tracking direction based on the detection result of the first detecting means, and the tracking error signal by the outputting means. The operation of the moving means is controlled by the output of the driver to move the light beam by the condensing means. Control means to follow the movement of the light beam in a tracking direction relative to the recording track,
In order to detect the current flowing through the moving means, a sensing resistor inserted in the output of the driver, when the power is turned on,
By outputting a reference signal to the driver, the second detecting means detects the voltage value of the sensing resistor as an offset value, and the driver detects the offset value detected by the second detecting means. It comprises a correction means for correcting the following movement of the light beam in the tracking direction with respect to the recording track.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk device as an information recording device. This optical disk apparatus records data (information) or reproduces recorded data on an optical disk 1 by using focused light.

Grooves and lands are formed on the surface of the optical disk 1 in a spiral shape or a concentric shape.
The optical disc 1 may be a recording layer or a multi-phase recording film that uses phase change or may be perforated. Further, a magneto-optical disk may be used. In the above case, the configuration of the optical head and the like are also appropriately changed. Further, here, a place where a signal is recorded on the optical disk is called a track, and the track is formed of a groove and a land, only a groove, or only a land.

Further, referring to FIG.
Is rotated at a constant speed, for example, by the motor 3.
The motor 3 is controlled by a motor control circuit 4. Recording and reproduction of information on the optical disk 1
The operation is performed by the optical head 5. The optical head 5 is fixed to a drive coil 7 constituting a movable portion of a linear motor 6, and the drive coil 7 is connected to a linear motor control circuit 8.

A speed detector 9 is connected to the linear motor control circuit 8 to send the speed signal of the optical head 5 to the linear motor control circuit 8. The linear motor control circuit 8 supplies the drive current to the drive coil 7 according to the speed signal from the speed detector 9 and the control speed supplied from the CPU 30 to be described later via the D / A converter 31. The drive control of the linear motor 6 is performed.

The fixed portion of the linear motor 6 is provided with a permanent magnet (not shown), and when the drive coil 7 is excited by the linear motor control circuit 8, the optical head 5 has a radius of the optical disk 1. It is designed to be moved in the direction.

An objective lens 10 is supported on the optical head 5 by a wire or a leaf spring (not shown). The objective lens 10 is moved by a driving coil 11 in the focusing direction (optical axis direction of the lens) and driven. The coil 12 enables movement in the tracking direction (direction orthogonal to the optical axis of the lens).

The laser control circuit 13 drives the semiconductor laser oscillator 19 to generate laser light. The laser control circuit 13 includes a modulation circuit 14 and a laser drive circuit 15, and operates in synchronization with a recording clock signal from a PLL circuit (not shown). The PLL circuit divides a basic clock signal from an oscillator (not shown) into a frequency corresponding to a recording position on the optical disc 1 to generate a recording clock signal.

The modulation circuit 14 modulates the recording data supplied from the error correction circuit 32 (described later) into a signal suitable for recording, that is, 2-7 modulation data. Laser drive circuit 1
Reference numeral 5 drives the semiconductor laser oscillator 19 in the optical head 5 with the 2-7 modulation data modulated by the modulation circuit 14.

The laser light generated by the semiconductor laser oscillator 19 driven by the laser drive circuit 15 of the laser control circuit 13 passes through the collimator lens 20, the half prism 21, and the objective lens 10 to the optical disc 1.
The light reflected upward from the optical disc 1 is guided to a photodetector 24 via an objective lens 10, a half prism 21, a condenser lens 22, and a cylindrical lens 23.

The photodetector 24 is composed of photodetector cells 24a, 24b, 24c and 24d divided into four parts. The output signal of the photodetector cell 24a of the photodetector 24 is supplied to one end of an adder 26a via an amplifier 25a, and the output signal of the photodetector cell 24b is supplied to one end of an adder 26b via an amplifier 25b. And the light detection cell 24c
Is supplied to the other end of the adder 26a via the amplifier 25c, and the output signal of the photodetector cell 24d is supplied to the other end of the adder 26b via the amplifier 25d.

The output signal of the photodetector cell 24a of the photodetector 24 is supplied to one end of the adder 26c via the amplifier 25a, and the output signal of the photodetector cell 24b is supplied to the amplifier 25.
b to one end of the adder 26d, and the output signal of the photodetector cell 24c is supplied to the adder 26d via the amplifier 25c.
d, the output signal of the photodetector cell 24d is
The signal is supplied to the other end of the adder 26c via the amplifier 25d.

The output signal of the adder 26a is supplied to the inverting input terminal of the differential amplifier OP2, and this differential amplifier OP2 is supplied.
The output signal of the adder 26b is supplied to the non-inverting input terminal of. As a result, the differential amplifier OP2 outputs a signal (focus error signal) related to the focus point according to the difference between the adders 26a and 26b to the focusing control circuit 27.
To be supplied. The output signal of the focusing control circuit 27 is supplied to the driving coil 11 for focusing, and the laser light is controlled so that the laser beam is always in perfect focus on the optical disc 1.

The output signal of the adder 26c is supplied to the inverting input terminal of the differential amplifier OP1.
The output signal of the adder 26d is supplied to the non-inverting input terminal of. As a result, the differential amplifier OP1 supplies the tracking error signal to the tracking control circuit 28 according to the difference between the adders 26c and 26d.
The tracking control circuit 28 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 28 is supplied to the drive coil 12 in the tracking direction. The sum signal of the outputs of the photodetector cells 24a, 24d of the photodetector 24 in the focusing and tracking states as described above, that is, the signal obtained by adding the output signals from the adders 26c, 26d by the adder 26e. Indicates the change in reflectance from pits (recording information) formed on the track. This signal is supplied to the data reproducing circuit 18, and the recorded data is reproduced in this data reproducing circuit 18.

The reproduced data reproduced by the data reproducing circuit 18 is output to the error correction circuit 32 via the bus 29. The error correction circuit 32 corrects an error using an error correction code ECC in the reproduced data, or adds an error correction code ECC to the recording data supplied from the interface circuit 35 and outputs the recording data to the memory 34.

The reproduced data error-corrected by the error correction circuit 32 is the bus 29 and the interface circuit 3.
5 to an optical disk control device 36 as an external device. The recording data is supplied from the optical disk control device 36 to the error correction circuit 32 via the interface circuit 35 and the bus 29.

Further, the optical disk device has a focusing control circuit 27 and a tracking control circuit 2 respectively.
8. A D / A converter 31 and an A / D converter 32 used for exchanging information between the linear motor control circuit 8 and the CPU 30 that controls the entire optical disk device are provided.

The motor control circuit 4, the linear motor control circuit 8, the laser control circuit 13, the data reproducing circuit 18, the focusing control circuit 27, and the tracking control circuit 2
8. The error correction circuit 33 and the like are connected to the CPU via the bus 29.
This CPU is controlled by the CPU 30.
Reference numeral 30 indicates a predetermined operation performed by a program recorded in the memory 34.

As shown in FIG. 2, the focusing control circuit 27 is composed of a phase compensation circuit 41, an adder 42, a driver 43, a sensing resistor 44, and a differential amplifier 45.

The phase compensating circuit 41 compensates the phase of the focus error signal from the differential amplifier OP2.
The phase-corrected focus error signal is supplied to the adder 42. The adder 42 receives the phase-compensated focus error signal from the phase compensation circuit 41 and D / from the CPU 30.
The offset value supplied via the A converter 31 (the offset value of the focusing control circuit 27 read from the memory 34) is added, and the added value is supplied to the driver 43. The driver 43 is configured by an IC and applies a current according to the added value from the adder 42 to a series circuit including the sensing resistor 44 and the drive coil 11.

The voltage across the sensing resistor 44 is supplied to each input of the differential amplifier 45. For example, when the power is turned on, the CPU 30 sets in the D / A converter 31 a digital value such that the input voltage of the driver 43 is the same as the reference of the driver 43. As a result, the current flowing from the driver 43 to the series circuit composed of the sensing resistor 44 and the drive coil 11 is changed to the driver 43.
Will be the output offset of. At this time, the sensing resistor 44
The voltage ΔV as the offset amount of the driver 43 corresponding to the potential difference caused by the current flowing through the differential amplifier 45 is
Is supplied to the CPU 30 via the A / D converter 32. The CPU 30 stores the digital value of the voltage ΔV in the memory 34 as an offset value of the focusing control circuit 27.

The tracking control circuit 28, as shown in FIG. 3, includes a phase compensation circuit 51, an adder 52, and a driver 5.
3, a sensing resistor 54, and a differential amplifier 55.

The phase compensation circuit 51 compensates the phase of the tracking error signal from the differential amplifier OP1, and the tracking error signal whose phase has been compensated is supplied to the adder 52. The adder 52 receives the phase-compensated tracking error signal from the phase compensation circuit 51 and the CPU 30.
To an offset value (offset value of the tracking control circuit 28 read from the memory 34) supplied from the D / A converter 31. The added value is supplied to the driver 53. The driver 53 is composed of an IC and applies a current corresponding to the added value from the adder 52 to a series circuit including the sensing resistor 54 and the drive coil 12.

The voltage across the sensing resistor 54 is supplied to each input of the differential amplifier 55. For example, when the power is turned on, the CPU 30 sets in the D / A converter 31 a digital value at which the input voltage of the driver 53 becomes the same as the reference of the driver 53. As a result, the current flowing from the driver 53 to the series circuit composed of the sensing resistor 54 and the driving coil 12 is changed to the driver 53.
Will be the output offset of. At this time, the sensing resistor 54
The voltage ΔV as the offset amount of the driver 53 corresponding to the potential difference caused by the current flowing through the differential amplifier 55 is
Is supplied to the CPU 30 via the A / D converter 32. The CPU 30 stores the digital value of the voltage ΔV in the memory 34 as the offset value of the tracking control circuit 27.

As shown in FIG. 4, the linear motor control circuit 8 includes a phase compensation circuit 61, an adder 62, a driver 63,
It is composed of a sensing resistor 64, a differential amplifier 65, and a switch 66.

The phase compensation circuit 61 compensates the phase of the tracking error signal from the differential amplifier OP1, and the phase-compensated drive signal is supplied to the adder 62. The adder 62 uses the phase-compensated drive signal from the phase compensation circuit 61 and the offset value (offset value of the linear motor control circuit 8 read from the memory 34) supplied from the CPU 30 via the D / A converter 31. The addition value is supplied to the driver 63. The driver 63 is composed of an IC and applies a current corresponding to the added value from the adder 62 to a series circuit including the sensing resistor 64 and the drive coil 7.

The voltage across the sensing resistor 64 is supplied to each input of the differential amplifier 65. The switch 66 is connected to the phase compensation circuit 61 side when the drive device is in tracking control, and is connected to the speed control signal side supplied from the CPU 30 through the D / A converter 31 when the seek operation is performed, and connects the driver 63. To drive.

For example, when the power is turned on, the CPU 30 outputs D
The input voltage of the driver 63 is applied to the A / A converter 31
Set a digital value that is the same as the reference of 3.
As a result, the current flowing from the driver 63 to the series circuit including the sensing resistor 64 and the drive coil 7 becomes the output offset of the driver 63. At this time, the voltage ΔV as the offset amount of the driver 63 corresponding to the potential difference caused by the current flowing through the sensing resistor 64 is output from the differential amplifier 65, and the CPU 3 via the A / D converter 32.
0. The CPU 30 stores the digital value of the voltage ΔV in the memory 34 as the offset value of the linear motor control circuit 8.

Next, focusing, tracking,
When performing the seek operation, the output offset of the driver is corrected by adding the already detected offset amount to the driver of each control circuit.

As described above, when the power is turned on, the reference signal is input to each driver of the focusing control circuit, the tracking control circuit, and the linear motor control circuit,
The current flowing from each driver to the corresponding coil is detected as the offset value, which is the potential difference across the sensing resistor connected in series to the coil, and the digital value of the offset value is stored in memory for focusing, tracking,
When performing a seek operation, the output offset of the driver is corrected by reading the already detected offset value from the memory and adding it to the driver of each control circuit.

This enables a function equivalent to the volume adjustment without using the adjusting volume. Therefore, the offset correction of each driver of the focusing control circuit, the tracking control circuit, and the linear motor control circuit can be realized without reducing the volume for adjustment and without performing the volume adjustment, thereby reducing the component cost and the adjustment time. It can be reduced.

In the above example, the offset of each driver of the focusing control circuit, tracking control circuit, and linear motor control circuit is adjusted. However, when the offset amount caused by the driver is small and the sensitivity of the detection system is low. Alternatively, the offset of the driver may not be adjusted.

[0047]

As described above in detail, according to the present invention, it is possible to provide an optical disk device that does not require volume and volume adjustment as means for correcting the offset of the driver, and can reduce component cost and adjustment time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical disc device for explaining an embodiment of the invention.

FIG. 2 is a block diagram showing a schematic configuration of a focusing control circuit.

FIG. 3 is a block diagram showing a schematic configuration of a tracking control circuit and a linear motor control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 5 ... Optical head 6 ... Linear motor 8 ... Linear motor control circuit 10 ... Objective lens 11, 12 ... Drive coil 24 ... Photodetector 27 ... Focusing control circuit 28 ... Tracking control circuit

Claims (6)

[Claims] 1. A condensing means for condensing a light beam onto an optical disk having spiral or concentric recording tracks, and reflected light from the optical disk is irradiated by the light beam of the condensing means, When the moving means moves the focusing means, the first detecting means outputs an electric signal according to the amount of received light, and the focusing means moves in the focusing direction of the optical axis of the light beam. The moving means, an output means for outputting a focusing error signal indicating position information of the light beam in the focusing direction based on the detection result of the first detecting means, and the focusing error signal by the output means. Based on the above, the operation of the moving means is controlled so that the light beam is moved by the condensing means, whereby the focus on the recording track is reduced. Control means for moving the light beam in the tracking direction, and second detecting means for detecting an offset value in the moving means by outputting a reference signal to the control means when the power is turned on. An optical disc device comprising: a correction unit that corrects the follow-up movement of the light beam in the focusing direction with respect to the recording track by the control unit according to the offset value detected by the detection unit. 2. A condensing means for condensing a light beam onto an optical disc having spiral or concentric recording tracks, and reflected light from the optical disc due to the light beam of the condensing means is irradiated, When the moving means moves the light collecting means, the first detecting means for outputting an electric signal according to the amount of received light and the light beam by the light collecting means are moved in a tracking direction orthogonal to the track. Moving means, an output means for outputting a tracking error signal indicating position information of the light beam in the tracking direction based on the detection result of the first detecting means, and a tracking error signal based on the tracking error signal by the output means. By controlling the operation of the moving means to move the light beam by the condensing means, the track to the recording track is tracked. Control means for moving the light beam in the moving direction, and second detection means for detecting the offset value in the moving means by outputting a reference signal to the control means when the power is turned on. An optical disc apparatus comprising: a correction unit that corrects the follow-up movement of the light beam in the tracking direction with respect to the recording track by the control unit according to the offset value detected by the detection unit. 3. A light condensing means for condensing a light beam on an optical disc having spiral or concentric recording tracks, and an irradiation position of the light beam by the condensing means on a recording track of the optical disc is determined. Determining means, first detecting means for detecting the moving speed of the light collecting means moved by the moving means, instructing means for instructing the movement ending position of the light collecting means, and the above-mentioned corresponding to the number of remaining tracks. A storage unit that stores a reference speed signal of the light collecting unit; and a current position determined by the determining unit and a target position indicated by the instructing unit when the light collecting unit is moved by the moving unit. Reading means for reading a reference speed signal corresponding to the number of remaining tracks from the storage means, and the moving speed of the light collecting means detected by the first detecting means. Control means for controlling the moving speed of the light collecting means by the moving means, and a reference signal output to the control means when the power is turned on. Second detecting means for detecting an offset value in the moving means, and correcting means for correcting the moving speed of the light collecting means by the control means in accordance with the offset value detected by the second detecting means, An optical disk device comprising: 4. A condensing means for condensing a light beam onto an optical disc having spiral or concentric recording tracks, and light reflected from the optical disc by the light beam of the condensing means is irradiated, When the moving means moves the focusing means, the first detecting means outputs an electric signal according to the amount of received light, and the focusing means moves in the focusing direction of the optical axis of the light beam. First moving means, first output means for outputting a focusing error signal indicating position information of the light beam in the focusing direction based on the detection result of the first detecting means, and the first output means. By controlling the operation of the first moving means on the basis of the focusing error signal from the output means to move the light beam by the condensing means, First control means for moving the light beam following in the focusing direction with respect to the track, second moving means for moving the light beam by the light collecting means in a tracking direction orthogonal to the track, and the first moving means. Second output means for outputting a tracking error signal indicating the position information of the light beam in the tracking direction based on the detection result of the second detection means, and the second output means based on the tracking error signal by the second output means. Second control means for moving the light beam in the tracking direction with respect to the recording track by controlling the operation of the second moving means to move the light beam by the condensing means; By outputting a reference signal to each of the first and second control means, each of the first and second moving means can be controlled. Focusing direction for the recording track by the first control means according to the second detection means for detecting the offset value and the offset value at the first moving means detected by the second detection means. The following movement of the light beam to the
Correction means for correcting the following movement of the light beam in the tracking direction with respect to the recording track by the second control means according to the offset value of the second movement means detected by the detection means. An optical disk device characterized by being provided. 5. A condensing means for condensing a light beam on an optical disc having spiral or concentric recording tracks, and reflected light from the optical disc is irradiated by the light beam of the condensing means, When the moving means moves the focusing means, the first detecting means outputs an electric signal according to the amount of received light, and the focusing means moves in the focusing direction of the optical axis of the light beam. The moving means, an output means for outputting a focusing error signal indicating position information of the light beam in the focusing direction based on the detection result of the first detecting means, and the focusing error signal by the output means. Based on the output of the driver, the operation of the moving means is controlled so that the light beam is moved by the condensing means. Control means for moving the light beam following in the focusing direction, a sensing resistor inserted in the output of the driver to detect the current flowing in the moving means, and a reference signal to the driver when the power is turned on. Second detecting means for detecting the voltage value by the sensing resistor as an offset value by outputting, and a focusing direction for the recording track by the driver according to the offset value detected by the second detecting means. An optical disc device comprising: a correction unit that corrects the following movement of the light beam to the. 6. A condensing means for condensing a light beam on an optical disc having spiral or concentric recording tracks, and reflected light from the optical disc is irradiated by the light beam of the condensing means, When the moving means moves the light collecting means, the first detecting means for outputting an electric signal according to the amount of received light and the light beam by the light collecting means are moved in a tracking direction orthogonal to the track. Moving means, an output means for outputting a tracking error signal indicating position information of the light beam in the tracking direction based on the detection result of the first detecting means, and a tracking error signal based on the tracking error signal by the output means. By controlling the operation of the moving means by the output of the driver to move the light beam by the condensing means,
Control means for moving the light beam following in the tracking direction with respect to the recording track, a sensing resistor inserted in the output of the driver for detecting the current flowing in the moving means, and a reference for the driver when the power is turned on. Second detection means for detecting the voltage value by the sensing resistor as an offset value by outputting a signal, and tracking by the driver with respect to the recording track according to the offset value detected by the second detection means. An optical disc device comprising: a correction unit that corrects the follow-up movement of the light beam in the direction.