JP2002190123A - Optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk apparatus capable of moving an optical head to a destination position on an optical disk in a short time. SOLUTION: When a track interval between the destination position on the optical disk and a current position of the optical head is equal to zero or less than a prescribed value (S105), and when the current position is in an inner circumferential position of the destination position such that the time required for jumping one track is within a time t, the number of moving tracks is caused to be zero by a control means (S113), and track jumping is not performed. When the current position is in an outer circumferential position of the destination position, or when the current position is in an inner circumferential position of the destination position such that the time required for jumping one track is not within a time t, a second number of moving tracks x2 or a third number of moving tracks x3 is of obtained (S110, S112), and track jumping is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk device.

[0002]

2. Description of the Related Art An optical disk (CD-ROM or the like) is used as a recording medium on which application software used for a personal computer (personal computer) is recorded.

[0003] For example, a CD-ROM has a disk shape with a diameter of about 12 cm, and tracks formed of a large number of pits carrying information are spirally formed at minute intervals on a recording surface thereof.

[0004] Such a CD-ROM, CD-R, C
2. Description of the Related Art There is known an optical disk device for reproducing or recording / reproducing a recordable / reproducible optical disk such as a D-RW.

This optical disk device comprises a rotation drive mechanism for mounting and rotating an optical disk, an optical head (optical pickup) capable of moving in a radial direction with respect to the mounted optical disk, and An optical head moving mechanism having a sled motor for moving.

In such an optical disk device, the optical head is moved (seeked) to a target position (target track), and at this target position, information (data) is recorded on the optical disk while performing focus control, tracking control, and the like. (Writing) and reproduction (reading) of information from the optical disk.

When the optical head is moved to the target position, it should be moved based on the track number at the target position and the track number at the position where the optical head is currently located (current position). The number of tracks is obtained, and the optical head passes (traverses) the tracks by the number of tracks to be moved, that is, makes a track jump and moves to the target position.

However, during the track jump, the optical head may not reach the target position or may pass by the target position, thereby increasing the number of track jumps and moving the optical head to the target position. There is a problem that the time required for the process is long. In addition, such a problem becomes conspicuous as the recording and reproduction speeds increase.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk apparatus which can move an optical head to a target position in a short time.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (9).

(1) An optical disk device having a rotation drive mechanism for mounting and rotating an optical disk, and an optical head, and recording and / or reproducing the optical disk via the optical head. Moving means for moving the optical head to a position, wherein the moving means, when moving the optical disk to the target position, includes time data indicating the target position and time data indicating the current position of the optical head. An optical disc device characterized in that the number of tracks to be moved is obtained based on the difference.

(2) The moving means is such that the optical head is on the inner peripheral side of the optical disk from the target position,
The optical disc device according to (1), wherein when the optical head is located within a time required to move a predetermined number of tracks, the optical head is moved to the target position by following the track.

(3) The moving means is such that the optical head is located on the inner peripheral side of the optical disk from the target position,
When the optical head is located at a position exceeding the time required to move a predetermined number of tracks, or when the optical head is located on the outer peripheral side of the optical disk from the target position, the number of tracks to be moved is determined. The optical disk device according to (1) or (2), wherein the optical head is moved to the target position based on the information.

(4) The moving means, when obtaining the number of tracks to be moved, when the optical head is located on the outer peripheral side of the optical disk from the target position,
The optical disk apparatus according to (3), wherein the number of tracks to be moved is increased by a predetermined number of tracks when the optical head is located on the inner peripheral side of the optical disk from the target position.

(5) The optical disk device according to (4), wherein the predetermined number of tracks is one.

(6) The time required to move the predetermined number of tracks is the number of blocks passing through the optical head in the state where the optical head follows the track during the period near the target position. The optical disc device according to any one of the above (2) to (5).

(7) The above-mentioned (2), wherein the predetermined number is one.
The optical disc device according to any one of (1) to (6).

(8) The number of tracks to be moved is a difference between time data indicating the target position and time data indicating the current position, and is a time required for the optical head to move a predetermined number of tracks. The optical disc device according to any one of the above (1) to (7), which is obtained by correcting.

(9) The number of tracks to be moved is a difference between time data indicating the target position and time data indicating the current position, and is a time required for the optical head to move a predetermined number of tracks. The optical disc device according to any one of (1) to (7), wherein the optical disc device is corrected, and the difference value after the correction is obtained by dividing the difference value by the number of blocks per track.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk drive according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing a circuit configuration (main part) of an embodiment of the optical disk device of the present invention, and FIG. 2 is a plan view showing an embodiment (with a casing removed) of the optical disk device of the present invention. It is.

The optical disk device 1 shown in these figures is a device for reproducing an optical disk (CD-ROM) 2.

A spiral track is formed on the optical disk 2. Note that a plurality of blocks (sectors), for example, about 10 to 20 blocks, are formed on one track (one track circumference).

The optical disk device 1 has a rotation drive mechanism for mounting and rotating the optical disk 2. The rotation drive mechanism mainly includes a spindle motor 11 for rotating the turntable, a driver 23 for driving the spindle motor 11, a turntable 13 fixed to the rotation shaft 12 of the spindle motor 11, and the optical disk 2 mounted thereon. It is composed of

The optical disk apparatus 1 moves in the radial direction of the optical disk 2 (the radial direction of the turntable 13), that is, in the direction of arrow A in FIG. An optical head (optical pickup) 3 to be obtained; an optical head moving mechanism for moving the optical head 3 in the radial direction;
Amplifier IC 40 and servo processor (DSP) 51
, A decoder 52, and a memory (for example, a RAM or the like) 5
3 and a casing (not shown) for accommodating them. Hereinafter, the radial direction of the optical disk 2 is simply referred to as “radial direction”.

The optical head 3 has an optical head main body (optical pickup base) 31 having a laser diode (light source) 5 and a divided photodiode (light receiving section) 6, and an objective lens (condensing lens) 32. I have.

The objective lens 32 is supported by a suspension spring (not shown) provided on the optical head main body 31.
The radial direction and the objective lens 3 are
2 (in the direction of the rotation axis of the optical disc 2 (turntable 13)). When the objective lens 32 deviates from its neutral position (middle point), the objective lens 32 is urged toward the neutral position by the restoring force of the suspension spring. Less than,
The optical axis direction of the objective lens 32 is simply referred to as “optical axis direction”, and the rotation axis direction of the optical disk 2 is simply referred to as “rotation axis direction”.

The optical head 3 is an optical head main body 3.
1 has an actuator 4 for moving the objective lens 32. The actuator 4 includes a tracking actuator for moving the objective lens 32 in the radial direction with respect to the optical head main body 31 and a focus actuator for moving the objective lens 32 in the optical axis direction (rotation axis direction).

The actuator 4, that is, the tracking actuator and the focus actuator are each driven by a driver 21.

The optical head body 31 is formed with three support portions (sliders) 311 that slide along a guide shaft 16 described later.

The optical head moving mechanism mainly includes a sled motor 7 and a driver 22 for driving the sled motor 7.
A lead screw (worm gear) 81 fixed to the rotation shaft 8 of the thread motor 7, a reduction gear 14, a rack gear 15, a pair of guide shafts 16 for guiding the optical head 3, and the three supports described above. (Slider) 311.

The reduction gear 14 comprises a worm wheel 141 meshing with the lead screw 81, and a pinion gear 142 fixed concentrically to the worm wheel 141 and having a smaller diameter than the worm wheel 141.

The rack gear 15 meshes with the pinion gear 142 and is fixed to the optical head main body 31.

As described above, the optical head 3 supports the pair of guide shafts 16, 16 with the support portions 31.
1 movably supported.

The thread motor 7 is driven, and its rotating shaft 8
When the lead screw 81 rotates in a predetermined direction,
The worm wheel 141 and the pinion gear 142 rotate in a predetermined direction, and the rack gear 15 and the pinion gear 142
Thus, the rotational movement of the pinion gear 142 is converted into a linear movement of the optical head 3, and the optical head 3 moves in a predetermined direction along the guide shaft 16.

When the rotation shaft 8 of the thread motor 7 and the lead screw 81 rotate in the opposite direction, the optical head 3 moves along the guide shaft 16 in the opposite direction.

The control means 9 is usually constituted by a microcomputer (CPU), and comprises an optical head 3 (actuator 4, laser diode 5, etc.), a thread motor 7, a spindle motor 11, an RF amplifier IC 40, a servo processor 51, and a decoder 52. , The memory 53, etc., are controlled.

The actuator 4, the sled motor 7, the driver 21, the driver 22, and the servo processor 51 constitute a moving means for moving the optical head 3 to a target position on the optical disk 2.

When the optical head 3 is moved to a target position (target track) on the optical disk 2, track jump control is performed. In the track jump control, the drive of the sled motor 7 and the drive of the actuator 4 are controlled, and the optical head 3 is moved to a target position by coarse seek (rough search), fine seek (fine search), or a combination thereof. Let it.

When moving from the position (current position) where the optical head 3 is currently located to the target position, the optical head 3
When the number of tracks (the number of tracks from the current position to the target position) through which is passed is relatively large, coarse seek is performed.

If the optical head 3 is not at the target position at the end of the coarse seek, then
The precision seek is performed, and the optical head 3 is moved to the target position by the precision seek.

When the number of tracks through which the optical head 3 passes is relatively small, precision seek is performed, and the optical head 3 is moved to a target position by the precision seek. Hereinafter, a process of moving the optical head 3 to a target position during the coarse seek and the fine seek will be described.

When the optical head 3 moves from the current position to the target position, based on time data (time information) indicating the current position and the target position, the number of tracks through which the optical head 3 passes, that is, the number of tracks to be moved ( The optical head 3 moves in the radial direction (track jump) while counting the number of tracks to be moved, and moves to the target position. Hereinafter, the number of tracks to be moved by the optical head 3 is simply referred to as “moving track number”, and the passage of the optical head 3 in the radial direction while counting the number of tracks is simply referred to as “track jump”.

Here, where the current position where the optical head 3 is located is located with respect to the target position,
Since the method of calculating the number of moving tracks is different, a method of calculating the number of moving tracks based on each condition will be described below.

First, LBN (logical block number) a1, which is time data (time information) indicating a target position on the optical disk 2, is converted into a track number.
The track number b1 at the target position is calculated.

Here, LBN (logical block number) is the program area start time (0
It represents the number of blocks when counting the blocks along the track from the first block (sector) of the track of minute 0 second 0 frame). Note that the LBN of the first block of the track at the program area start time of the optical disc 2 is
It is "0".

The track number is
Represents the number of tracks when the tracks are counted in the radial direction from the center track. The track number of the center track of the optical disc 2 is “0”.

Next, the LBNa at the current position of the optical head 3 is
2 is converted to a track number, thereby calculating a track number b2 at the current position, and subtracting one track from the difference between the track number b1 at the target position and the track number b2 at the current position, and calculating the number of tracks to be moved. (The number of first moving tracks x1).

Here, when obtaining the first moving track number x1, one track is subtracted because the optical head 3 uses the first track number x1.
After the track jump is performed by the number of moving tracks x1, the optical head 3 moves one track before the target position, and if the optical head 3 follows the track at that position, the optical disk 2 rotates, so that the target position reaches the optical head 3. Because you do.

Next, when the first moving track number x1 is-
In the case of A ≦ x1 ≦ B (A and B are natural numbers), the first
No track jump is performed with the number of moving tracks x1, and the second number of moving tracks x2 is obtained as follows.

Here, A is not particularly limited, but is preferably, for example, about 0 to 30. Further, B is not particularly limited, but is preferably, for example, about 0 to 30. A and B may be the same or different, but preferably are the same if possible.

First, a difference value between the LBNa1 at the target position and the LBNa2 at the current position (the number of blocks c to the target position)
Ask for. Hereinafter, the LBN of the destination position and the LBN of the current position
Is simply referred to as “the number of blocks to the destination position”.

Next, when the number of blocks c to the target position is 1 or more and within the time (the number of blocks) t required to track-jump one track, the number of moving tracks is set to 0, and the track jump is executed. Instead, the optical head 3 reaches the target position by following the track at the current position. Hereinafter, the operation of jumping one track is simply referred to as “one track jump”.

Here, the time (the number of blocks) t required for one track jump is determined by passing the optical head 3 per time t required for one track jump near the target position in a state where the optical head 3 follows the track. The number of blocks to be performed (the number of blocks). Therefore, if the number of rotations of the optical disc 2 increases N times, the time (the number of blocks) t required for one track jump increases N times in proportion thereto.

On the other hand, when the number c of blocks to the target position is 1 or more and the optical head 3 is not located at a position within the time t required for performing track jump of one track,
As described below, the second moving track number x2 or the third moving track number x3 is obtained, and a track jump is performed.

First, if the current position of the optical head 3 is located on the inner peripheral side of the target position and the number c of blocks to the target position exceeds the time t required for one track jump, the number of blocks to the target position is determined. The difference value between c and the time t required for one track jump is divided by the previously calculated number d of blocks per track near the target position, and the obtained value is calculated as the number of moving tracks (the second number of moving tracks). x
As 2), a track jump is performed.

When the second number of moving tracks x2 is obtained, the time t required for one track jump is corrected to prevent the optical head 3 from passing the target position.

On the other hand, when the current position of the optical head 3 is located on the outer peripheral side of the target position, that is, when the number of blocks c to the target position is less than 0, the second moving track number x2 is obtained. Further, a value obtained by subtracting one track from the second moving track number x2 is set as the moving track number (third moving track number x3), and a track jump is performed.

That is, when the track jump is performed with the third moving track number x3, the jump is performed by one track more than the second moving track number x2.

Incidentally, a first moving track number x1, a second moving track number x2, a third moving track number x3,
Alternatively, if the number of track jumps by the combination thereof is repeated a predetermined number of times or more and the current position of the optical head 3 is located on the outer peripheral side of the target position, the number of moving tracks at the present time is further increased by two. The value obtained by subtracting the track is set as the number of moving tracks (fourth moving track number × 4), and a track jump is performed.

On the other hand, in the case where the number of track jumps by the first moving track number x1, the second moving track number x2, the third moving track number x3, or a combination thereof is repeated a predetermined number of times C or more, When the current position of the optical head 3 is located on the inner peripheral side of the target position and the current number of moving tracks is 2 or less, the number of moving tracks is set to 0, and no track jump is performed. 3 is made to follow the track at the current position to reach the target position. C is not particularly limited, but is preferably, for example, about 5 to 10.

Thus, in the optical disk device 1,
The optical head 3 is moved to a target position by performing a track jump with the number of moving tracks based on each condition.

An external device (for example, a computer) is detachably connected to the optical disk device 1 via an interface control unit (not shown).
And an external device.

Next, the operation of the optical disk device 1 will be described. The optical disk device 1 moves the optical head 3 to a target position (target track), and performs focus control, tracking control, sled control, rotation speed control (rotation speed control), and the like at the target position, while performing optical control. Reading (reproduction) of information (data) is performed.

At the time of reproduction, a predetermined track of the optical disk 2 is irradiated with a laser beam from the laser diode 5 of the optical head 3. This laser light is reflected by the optical disk 2, and the reflected light is received by the split photodiode 6 of the optical head 3.

The split photodiode 6 outputs a current corresponding to the amount of received light, and this current is
-V amplifier (current-voltage conversion unit) is converted to voltage,
Output from the optical head 3.

The voltage (detection signal) output from the optical head 3 is input to an RF amplifier IC 40, and the RF amplifier IC 40 performs addition, amplification, and the like to obtain an HF signal.
An (RF) signal is generated. This HF signal is an analog signal corresponding to pits and lands written on the optical disc 2.

The HF signal is input to a servo processor 51, which binarizes the HF signal,
M (Eight to Fourteen Modulation) demodulation, decoding (conversion) to data (DATA signal) of a predetermined format, and input to the decoder 52.

Then, this data is supplied to the decoder 52 by the decoder 52.
The data is decoded into data of a predetermined format for communication (transmission) and transmitted to an external device (for example, a computer) via an interface control unit (not shown).

The tracking control, sled control, focus control and rotation speed control in the above-described reproducing operation are performed as follows.

As described above, the signal (voltage) after current-voltage conversion from the divided photodiode 6 of the optical head 3
Is input to the RF amplifier IC 40.

The RF amplifier IC 40 receives the current-voltage converted signal from the divided photodiode 6 and
A tracking error signal (TE) (voltage) is generated.

The tracking error signal is output from the objective lens 3
2 is a signal indicating the amount of displacement in the radial direction, that is, the magnitude and direction of the displacement of the objective lens 32 in the radial direction from the center of the track (the amount of displacement from the center of the track).

The tracking error signal is input to the servo processor 51. The servo processor 51 performs predetermined signal processing such as phase inversion and amplification on the tracking error signal, thereby generating a tracking servo signal (voltage). A predetermined drive voltage is applied to the actuator 4 via the driver 21 based on the tracking servo signal, and the objective lens 32 moves toward the center of the track by driving the actuator 4. That is, tracking servo is applied.

The drive of the actuator 4 alone has a limitation in causing the objective lens 32 to follow the track. To cover this, the thread motor 7 is driven via the driver 22 to move the optical head main body 31 to the object. Control is performed such that the objective lens 32 returns to the neutral position by moving in the same direction as the direction in which the lens 32 has moved (thread control is performed).

The RF amplifier IC 40 generates a focus error signal (FE) (voltage) based on the current-voltage converted signal from the divided photodiode 6.

The focus error signal is transmitted to the objective lens 32
In the optical axis direction (rotation axis direction), that is, the objective lens 3 in the optical axis direction (rotation axis direction) from the in-focus position.
2 is a signal indicating the magnitude and direction (deviation amount of the objective lens 32 from the in-focus position) of the deviation of the objective lens 32.

The focus error signal is input to the servo processor 51. The servo processor 51 performs predetermined signal processing such as phase inversion and amplification on the focus error signal, thereby generating a focus servo signal (voltage). A predetermined drive voltage is applied to the actuator 4 via the driver 21 based on the focus servo signal, and the objective lens 32 moves toward the focus position by driving the actuator 4. That is, focus servo is applied.

The servo processor 51 generates a control signal (voltage) for controlling the rotation speed (rotation speed) of the spindle motor 11, that is, a control signal for setting the rotation speed of the spindle motor 11 to a target value. The data is input to the driver 23.

The driver 23 generates a drive signal (voltage) for driving the spindle motor 11 based on the control signal.

The drive signal output from the driver 23 is input to the spindle motor 11, and the spindle motor 11 is driven based on the drive signal, and the spindle servo is controlled so that the rotation speed of the spindle motor 11 becomes the target value. Take it.

Next, the control operation of the control means 9 of the moving means for moving the optical head 3 to the target position on the optical disk 2 will be described.

FIGS. 3, 4 and 5 are flowcharts showing the control operation of the control means 9 of the optical disk device 1. Hereinafter, description will be made based on this flowchart.

First, when there is a read request from the personal computer, this program is executed (started). At this time, the personal computer notifies the optical disk device 1 of the LBNa1 of the target position to read.

Next, the track number b1 of the target position is calculated from LBNa1 of the target position (step S10).
1) Based on the information, the number of blocks d per track near the target position is calculated (step S10).
2).

The LBNa at the current position of the optical head 3 is
Then, the track number b2 of the current position is calculated from 2 (step S103).

Then, as described above, step S10
By subtracting 1 from the difference between the track number b1 of the target position obtained in step 1 and the track number b2 of the current position obtained in step S103, the number of moving tracks (first moving track number x1 = b1-b2- 1) is obtained (step S104).

When the number of moving tracks (first moving track number x1) obtained in step S104 is equal to or less than -17 tracks or equal to or more than 17 tracks, that is, the current position of the optical head 3 is separated from the target position by 17 tracks or more. If it is located at the shifted position, the process proceeds to step S114 (step S105).

When the number of moving tracks (first moving track number x1) obtained in step S104 is equal to or more than -16 tracks and equal to or less than 16 tracks, that is, the current position of the optical head 3 is 16 tracks from the target position. If the position is within the position, the time t required for one track jump near the target position is calculated (step S10).
6).

After the end of step S106, the target position L
From the difference between BNa1 and LBNa2 at the current position, the number of blocks c (c = a1-a2) to the destination position is determined (step S107).

When the number of blocks c to the target position is 0, that is, when the target position matches the current position,
The process proceeds to step S114 (step S108).

In step S108, if the number c of blocks to the target position is not 0, it is determined whether the number c of blocks to the target position is 1 or more and within the time t required for one track jump obtained in step S106. (Step S109), the number of blocks c at the target position is 1 or more, and the time t required for one track jump
If not, the number of moving tracks is set to 0 as described above, and no track jump is performed, and the optical head 3 is caused to follow the track at the current position to reach the target position.
(Step S113).

If the condition of step S109 is not satisfied, as described above, the difference between the number c of blocks to the target position and the time t required for one track jump is calculated in the vicinity of the target position obtained in step S102. Divide by the number d of blocks per track, and divide the obtained value by the number of moving tracks (the number of second moving tracks x2 = (ct)).
/ D) (step S110).

Next, it is determined whether or not the number of blocks c to the target position is less than 0 (step S111). If the number of blocks c to the target position is not less than 0, the flow advances to step S114 to proceed to step S114. If the number of blocks c up to is less than 0, as described above, the value obtained by subtracting one track from the second number of moving tracks x2 obtained in step S110 is calculated as the number of moving tracks (the third number of moving tracks x3 = 3). x2
-1) (step S112).

In step S114, it is determined whether or not the track jump has been repeated for the same target position 10 times or more. If the track jump has been repeated 10 times or more, the process proceeds to step S115, and the number of tracks to be moved is less than 0. Is determined (step S115). on the other hand,
10 track jumps to the same destination
If less than the number of times, the process proceeds to step S117.

If the number of moving tracks is less than 0 in step S115, that is, if the current position is on the outer peripheral side of the target position, as described above, the track jumps by two more tracks. A value obtained by subtracting two tracks from the number (fourth moving track number × 4) is obtained (step S116).

On the other hand, if the number of moving tracks is not less than 0, that is, if the current position is on the inner side of the target position, it is determined whether the number of moving tracks is two or less (step S118). When the optical head 3 is located within two tracks from the target position, the number of moving tracks is set to 0, no track jump is performed, and the optical head 3 is caused to follow the track at the current position to reach the target position ( Step S119).

If it is determined in step S118 that the optical head 3 is located at least three tracks away from the target position, the process proceeds to step S117.

In step S117, it is determined whether or not the number of moving tracks is 0. If the number of moving tracks is not 0, a seek operation is performed (step S120).
That is, a track jump is performed using the current number of moving tracks. Next, time data of the position where the optical head 3 is located is obtained, and LBNa2 of the current position is obtained from the time data (step S121).

After performing step S121, step S121
Returning to step 103, the process returns to step S103.

If the number of moving tracks is 0 in step S117, the seek operation ends. Above,
This program is ended, and the process shifts to the next control such as reading of information (read operation).

As described above, according to the optical disk device 1, the optical head 3 can be moved to the target position in a short time.

In particular, when the number of tracks to be moved is equal to or less than a predetermined value, it is possible to prevent the target position from reaching or passing the target position.
), The optical head 3 can be moved to the target position. Thereby, the moving time of the optical head 3 moving to the target position can be reduced.

The optical disk device of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and each component may have any configuration having the same function. Can be replaced by

The optical disk device of the present invention uses the above-described CD.
-Not limited to the ROM drive device, for example, a CD
-R, CD-RW, DVD-R, DVD-RW, DVD
-Various optical disk devices for recording / reproducing a recordable / reproducible optical disk (optical disk having a pre-groove) such as a RAM, a read-only optical disk such as a CD (compact disk), and a recordable / reproducible optical disk The present invention can be applied to various optical disk devices.

Further, the optical disk device of the present invention can be applied to various optical disk devices for recording and / or reproducing a plurality of types of optical disks.

[0107]

As described above, according to the optical disk device of the present invention, the optical head can be moved to the target position in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration (main part) of an embodiment of an optical disk device of the present invention.

FIG. 2 is a plan view showing an embodiment (with a casing removed) of the optical disc device of the present invention.

FIG. 3 is a flowchart showing a control operation of a control unit of the optical disk device shown in FIG.

4 is a flowchart (continued from FIG. 3) showing a control operation of a control unit of the optical disk device shown in FIG.

5 is a flowchart (continuation of FIG. 4) showing a control operation of a control unit of the optical disk device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 2 Optical disk 3 Optical head 31 Optical head main body 32 Objective lens 311 Support part 4 Actuator 5 Laser diode 6 Split photodiode 7 Thread motor 8 Rotation axis 81 Lead screw 9 Control means 11 Spindle motor 12 Rotation axis 13 Turntable 14 Deceleration Gear 141 Worm wheel 142 Pinion gear 15 Rack gear 16 Guide shaft 21-23 Driver 40 RF amplifier IC 51 Servo processor 52 Decoder 53 Memory S101-S121 Step

Claims (9)

[Claims] 1. An optical disk device comprising: a rotation drive mechanism for mounting and rotating an optical disk; and an optical head, wherein the optical disk device records and / or reproduces the optical disk via the optical head. Moving means for moving the optical head to move the optical disk to the target position, wherein the moving means has a difference between time data indicating the target position and time data indicating the current position of the optical head. An optical disc apparatus characterized in that the number of tracks to be moved is obtained based on the following. 2. The moving means according to claim 1, wherein said optical head is located at a position on the inner peripheral side of said optical disk from said target position and within a time required for said optical head to move a predetermined number of tracks. 2. The optical disk device according to claim 1, wherein the optical disk device moves the optical head to the target position while following the track. 3. The moving means, when the optical head is located on the inner peripheral side of the optical disc from the target position and when the optical head is located at a position exceeding a time required to move a predetermined number of tracks, or When the optical head is located on the outer peripheral side of the optical disc from the target position,
3. The optical disk device according to claim 1, wherein the number of tracks to be moved is obtained, and the optical head is moved to the target position based on the information. 4. The moving means, when obtaining the number of tracks to be moved, when the optical head is located on the outer peripheral side of the optical disk from the target position, the optical head is moved from the target position to the position of the optical disk. 4. The optical disc apparatus according to claim 3, wherein the number of tracks to be moved is set larger by a predetermined number of tracks than when the track is located on the inner peripheral side. 5. The predetermined number of tracks is one.
An optical disk device according to claim 1. 6. The time required to move the predetermined number of tracks is the number of blocks passing through the optical head near the target position while the optical head follows the track during the period. Item 6. An optical disk device according to any one of Items 2 to 5. 7. The method according to claim 2, wherein the predetermined number is one.
An optical disc device according to any one of the above. 8. The number of tracks to be moved is obtained by correcting a difference value between time data indicating the target position and time data indicating the current position by a time required for the optical head to move a predetermined number of tracks. The optical disk device according to claim 1, wherein the optical disk device is obtained by performing the following. 9. The number of tracks to be moved is obtained by correcting a difference value between time data indicating the target position and time data indicating the current position by a time required for the optical head to move a predetermined number of tracks. And the difference value after the correction is 1
8. The optical disk device according to claim 1, wherein the optical disk device is obtained by dividing by a number of blocks per track.