JP2002230927A - Device and method for recording and reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a recording and reproducing device and its method, by which a track jump can be correctly performed at a high speed at the time of seeking. SOLUTION: The device is provided with a track counting means for counting the number of tracks which a recording and reproducing head crosses at the time of seeking of the recording and reproducing head and outputting an interruption signal at each prescribed count and a control means for controlling a driving means so as to fix the time interval of the interruption signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus, and more particularly to a recording / reproducing apparatus and a recording / reproducing method for moving a pickup to a desired position at a high speed by applying a voltage to a control circuit for driving the pickup.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing an outline of a conventional optical disk device. In the figure, a pickup 20 having an optical system 3 as a recording / reproducing head is connected to an optical disk 19.
When the seek mode for high-speed movement to a desired position is selected, the track jump pulse is converted into a drive voltage (track actuator drive voltage) of a level necessary for jump, and the track actuator drive voltage is applied to the track actuator 17. Then, the pickup 16 is caused to make a track jump. Next, when jumping to the braking start position calculated from the tracking error signal or the like, braking (brake voltage) is applied to the track actuator 17 to perform a micro seek for jumping accurately to the target position.

When the track actuator 17 jumps out of the movable range, the sled kick pulse is converted into a sled slive voltage, which is a drive voltage of a level necessary for the jump, and the sled drive voltage is applied to the sled motor 18 so that the track is driven. The pickup 20 having the actuator 17 is displaced in the sled direction. When the pickup 20 reaches the braking start position calculated from the rotation speed of the sled motor 18, the tracking error signal, and the like, a brake voltage is applied to the sled motor 18 to perform braking, and macro seek for accurately accessing the target position is performed. .

In the prior art, the sled drive voltage of a constant voltage level is applied to the sled motor 18 during a track jump (thread kick) period, so that the pickup 20 accelerates without limit. Therefore, in the conventional optical disk device in which the braking start position is set based on the rotation speed information of the sled motor 18, there is a problem that the speed control of the sled motor 18 becomes complicated. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 10-340559, a pulse generator or the like is provided in the sled motor 18, a rotation speed detection signal is obtained from the sled motor 18, and the sled motor 18 is controlled to solve the problem.

Even if the brake is turned off at a predetermined track when the sled motor 18 is braked and the tracking control is immediately performed, it is extremely difficult to stop the pickup accurately on the predetermined track due to a time lag due to the inertia of the pickup 20 or the like. It was difficult. Therefore, conventionally, the above-described micro-seek is performed after the macro-seek, and the track jump is performed by an amount corresponding to an error such as an overrun to correct the error. However, it was a bottleneck for seeking at high speed. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 9-102135, the peak value and the width of the brake pulse are corrected based on the tracking error signal during the output of the brake pulse.

[0006]

In the prior art, an external component called a pulse generator is required at the time of seeking, or even if the peak value and width of the brake pulse are controlled no matter how many tracks are still on when the track is turned on. There is a problem that a variation error occurs, and it is necessary to correct by micro seek.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a recording / reproducing apparatus and a recording / reproducing method capable of performing a track jump at high speed and accurately at a seek operation.

[0008]

In a recording / reproducing apparatus according to the present invention, a track count for outputting an interrupt signal at every predetermined count by counting the number of tracks traversed by the recording / reproducing head when the recording / reproducing head seeks. Means, and control means for controlling the driving means so that the time interval of the interrupt signal is constant.

[0009] The track count means may include N (N:
(Natural number) The first that outputs the first interrupt signal for each count
And a driving means having a sled direction driving means for moving the recording / reproducing head in a sled direction, and a control means for controlling a time interval of the first interrupt signal to be constant. This controls the sled direction driving means.

Further, the control means controls the sled direction driving means so as to apply a brake to the movement of the recording / reproducing head just before a predetermined interval from the target track in the seek operation.

Further, the first track counting means sets the output of the first interrupt signal at every count smaller than N counts before a predetermined interval from the target track.

Further, the track count means may be M
(N≫M, M: natural number) a second track counting means for outputting a second interrupt signal for each count, a driving means having a track actuator for moving the recording / reproducing head in a tracking direction, The control means controls the track actuator so as to make the time interval of the second interrupt signal constant.

Further, the control means controls the track actuator so as to apply a brake to the movement of the recording / reproducing head before a predetermined interval from the target track.

Further, the second track counting means includes:
The output of the second interrupt signal is set at every count smaller than M counts before a predetermined interval from the target track.

In the recording / reproducing method according to the present invention, during a seek operation, the number of tracks traversed by the recording / reproducing head is counted by a signal from the recording / reproducing head, and an interrupt signal is output every predetermined count. And a control step of controlling the driving means so that the time interval between the interrupt signals is constant.

Further, in the interruption step, a first interruption signal for outputting the first interruption signal at every N (N: natural number) counting by counting the movement between the tracks during the seek operation, and outputting the first interruption signal, The sled direction driving means for moving the recording / reproducing head in the sled direction is controlled so that the time interval of the first interrupt signal is constant.

In the interruption step, the movement between the tracks during the seek operation is counted and M (N≫M, M:
(A natural number) outputting a second interrupt signal at each count, and controlling a track actuator for moving the recording / reproducing head in the tracking direction so that the time interval of the second interrupt signal is constant in the control step. It is.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a configuration of an optical disk device as a recording / reproducing device according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an optical disk as an information recording medium, 2 denotes a spindle motor for rotating the optical disk 1, and 3 denotes a recording / reproducing medium for recording information on the optical disk 1 or reproducing information recorded on the optical disk 1. An optical system as a recording / reproducing head having a semiconductor laser as a light source, an objective lens for narrowing a laser beam to a minute light spot, and a sensor for detecting reflected light from the optical disk 1, 4 is a direction traversing a track of an information recording medium. As a driving means for moving the recording / reproducing head, a tracking actuator for moving an objective lens (not shown) of the optical system 3 in a tracking direction which is a microscopic radial direction of the optical disc 1, and the optical system 3 has A focus for moving the objective lens in a focus direction perpendicular to the recording / reproducing surface of the optical disc 1 A pickup 20 includes an optical system 3, a tracking actuator 4, and a focus actuator 5, and is configured to move in a radial direction of the optical disc 1 to access a desired track. As a driving means for moving the recording / reproducing head in a direction traversing the track, a sled motor which is a sled driving means for moving the pickup 20 in a sled direction which is a macroscopic radial direction of the optical disc 1, and a driver 7 for the sled motor 6 is there.

Reference numeral 8 denotes a tracking error detector that detects a tracking error signal based on the output of a sensor in the optical system 3, and 9 denotes a focus error detector that detects a focus error signal based on the sensor output in the optical system 3. is there. Then, the detected tracking error signal and focus error signal are output to the analog signal processing unit 10, respectively. The analog signal processing unit 10 performs processing such as amplification and waveform formation, including the reproduced signal obtained based on the sensor output in the optical system 3. First, the reproduced signal is binarized and subjected to signal processing such as error correction in the digital signal processing unit 11. Further, the tracking error signal and the focus error signal processed by the analog signal processing unit 10 are output to the servo signal processing unit 12. In the servo signal processing unit 12, respective control command values are obtained from the tracking error signal and the focus error signal processed by the analog signal processing unit 10, and are sent to the spindle motor 2, the tracking actuator 4, the focus actuator 5, and the driver 7. Servo control is performed.

Reference numeral 13 denotes a track counter 13 as a track counting means for counting the number of tracks traversed by the recording / reproducing head when the recording / reproducing head seeks and outputting an interrupt signal at every predetermined count. The track counter 13 is configured to receive a binary signal obtained by binarizing the tracking error signal by the analog signal processing unit 10 and measure how many tracks have passed during a track jump.

Reference numeral 14 denotes a control microcomputer as control means for controlling the driving means so that the time interval of the interrupt signal is constant. The measurement value of the track counter 13 is input to the control microcomputer, and the servo microcomputer 1
2 is used for control. The control microcomputer 14 is a microprocessor for controlling the entire system.

Next, the operation of this embodiment will be described with reference to FIGS.
It will be described based on. FIG. 2 is a flowchart showing the operation sequence of the control microcomputer 14 in the macro seek operation according to the present embodiment. FIG. 3 is a diagram showing a binarized signal of a tracking error signal when shifting from the tracking operation to the seek operation, and driving of the sled motor 6. 5 is a time chart showing signals and interrupt timings to the control microcomputer 14.

In FIG. 2, the control microcomputer 14
When the backup access is instructed, the thread motor 6
Is released and the pickup is sent in the radial direction.
Is applied to the sled motor 6 (S
1). In FIG. 3, the timing T ₁Is equivalent to Then
The tracking control is turned off (S2), and the pickup 2
0 means that seek operation to the designated target track is started.
You. Here, as shown in FIG.₁~ Ta
Imming T_TwoDuring the operation delay of the pickup 20
The delay of tracking control OFF is delayed by
I'm making it.

When the kick pulse is continuously applied to the sled motor 6, the pickup continues to accelerate.
The binary signal of the tracking error signal in FIG. 3 cannot be read by the track counter 13. Therefore,
Reverse brake pulse is applied once at the timing T ₃ (S3).

Since the track counter 13 is set so as to generate an interrupt signal every time N (N: natural number) is counted as the number of passing tracks, an interrupt signal as shown in FIG. Control microcomputer 14
(S4). The control microcomputer 14 measures the time from when the track is turned off until the first interrupt signal is input (S5).
To release the brake pulse as the timing T ₄ of,
A kick pulse is applied again (S6). If the value is smaller than the predetermined value, the application of the brake pulse is continued (S
8).

Next, when the interrupt signal again after the N count at the timing T ₅ in FIG. 3 is output to the control microcomputer 14, the kick pulse if the time until the timing T ₄ ~ timing T ₅ was given value Is stopped (S
7), the time interval of the interrupt signal by the time until the timing T ₅ ~ timing T ₆ repeats that such brake pulse is applied, if smaller than the predetermined value (S8) becomes constant, N the count At each time, the constant speed control is performed so that the passage time of the pickup becomes a predetermined value.

[0027] Here, it is possible to select the predetermined value to the highest time capable of the time from the timing T ₄ to time T ₅ the track counter 13 is counted N present precisely, it is that case fastest seek control, The constant speed control controls the pickup so that it does not run away any more, and the control microcomputer 14 can accurately grasp the number of passing tracks.

Next, close the passage tracks of the initial target at the timing T ₇ of FIG. 3, when come to the predetermined distance before the target track (S9), the pickup brake pulse is applied enters the stop operation (S10) . At this time, the track counter 13 is reset from the interrupt output every N lines to one or several interrupt outputs less than N lines (S11).

[0029] Here, either because the time the pickup passes through the N present track is constant speed controlled to be constant, the braking timing of the timing T ₇ of FIG. 3 is a How many previous number target track Can be adjusted quite accurately.

Next, the control microcomputer 14 can confirm that the target track has been reached by the number of interrupts, and can recognize that it is close to the stop state by measuring each interrupt interval. It is detected that the number of remaining pickups is one or two, and the movement speed of the pickup is almost stopped, and the brake pulse to the sled motor 6 is released (S12). Then, an on-track control command is sent to the track actuator 4 (S13).

[0031] Finally, a stable behavior of the track actuator 4 to completely resumed at the timing T ₉ in FIG. 3 is a time when the on-track control is made the tracking control of the thread motor 6 (S14).

As described above, since the control microcomputer 14 can always keep track of the number of passing tracks and the passing time between tracks using the track counter 13, the sled motor 6 can be moved at high speed and constant speed when the pickup 20 moves. Since the pickup 20 can be stopped on the track and the operation can be returned to the on-track control efficiently, the seek operation can be speeded up.

Embodiment 2 FIG. FIG. 4 is a block diagram showing a configuration of an optical disk drive to which an optical disk seek control device according to Embodiment 2 of the present invention is applied. In the figure, reference numeral 15 denotes a track counter as second track counting means, which is connected to the control microcomputer 14.

Next, the operation of the second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a flowchart showing an operation sequence of the control microcomputer 14 in the macro seek operation according to the present embodiment. FIG. 6 is a diagram showing a binarized signal of a tracking error signal when shifting from the tracking operation to the seek operation, and driving of the sled motor 6. 5 is a time chart showing signals, a drive signal of a track actuator 4, and an interrupt timing to a control microcomputer 14.

First, in FIG. 5, when the control microcomputer 14 gives an instruction to access the pickup 20, the control of the sled motor 6 is released, and a kick pulse for sending the pickup 20 in the radial direction is applied to the sled motor 6. (S21). 6 corresponds to the timing T _11. Next, the tracking control is turned off (S22),
The pickup 20 starts a seek operation to the designated target track. Here, as shown in FIG. 6, during the period from timing T ₂₁ to timing T ₂₂ , the pickup 20
Of the tracking control by the amount corresponding to the operation delay time of
OFF is delayed.

However, if the kick pulse continues to be applied to the sled motor 6, the pickup continues to accelerate, so that the track counter 13 cannot read the binarized signal of the tracking error signal shown in FIG. Therefore, the reverse direction of the brake pulse is applied once at the timing T ₁₃ (S23).

On the other hand, the track counter 13, which is the first tracking means, is set to generate a first interrupt signal every time N tracks pass, so that the track counter 13 shown in FIG. A first interrupt signal as shown is output to the control microcomputer 14 (S2
4). After OFF control microcomputer 14 in the track control, releases the brake pulse as the first interrupt signal measures the time until the input (S25), if larger than a predetermined value timing T ₁₄ in FIG. 6 Then, the kick pulse is applied again to the thread motor 6 (S26).
If the value is smaller than the predetermined value, the application of the brake pulse is continued (S28).

Since the track counter 15 is set so as to generate a second interrupt signal each time M (M: natural number) is counted as the number of passing tracks, M
After this count, a second interrupt signal as shown in FIG. 6 is output to the control microcomputer 14 (S33). After the control microcomputer 14 in the track control OFF, measures the time until the first second interrupt signal is input (S34), if larger than the predetermined value to the track actuator 4 as a timing T ₁₄ in FIG. 6 A kick pulse is applied (S35). If it is smaller than the predetermined value, a brake pulse is applied (S37).

Here, the cycle N of the first interrupt signal of the track counter 13 and the cycle M of the second interrupt signal of the track counter 15 are determined by the control microcomputer 14 as N >> M (1). The sled motor 6 is configured to perform macroscopic control with an interrupt cycle N, and the track actuator 4 is configured to perform microscopic control with an interrupt cycle M.

Next, when the interrupt signal again after the M count at the timing T ₁₅ in FIG. 6 is output to the control microcomputer 14, the track actuator if the time from the timing T ₁₄ to the timing T ₁₅ was predetermined value applying kick pulses to 4 by repeating the like is stopped (S36), the time from the timing T ₁₅ to time T ₁₆ brake pulse if smaller than a predetermined value is applied (S37), M The constant speed control is performed so that the passage time of the track actuator 4 becomes a predetermined value for each count.

Next, when the interrupt signal again after the N count at the timing T ₁₆ in FIG. 6 is output to the control microcomputer 14, a sled motor if the time from the timing T ₁₆ to the timing T ₁₇ was predetermined value applying kick pulses to 6 by repeating the like is stopped (S27), the time from the timing T ₁₇ to time T ₁₈ brake pulse if smaller than a predetermined value is applied (S28), M The constant speed control is performed so that the passage time of the pickup becomes a predetermined value for each actual count.

[0042] Here, it is possible to select the predetermined value to the highest time capable of the time from the timing T ₁₄ to time T ₁₆ the track counter 15 is counted M present precisely, it is that case fastest seek control, The constant speed control controls the track actuator 4 so that it does not run away any more, and the control microcomputer 14 can accurately grasp the number of passing tracks.

Further, from the timing T ₁₆ to the timing T ₁₈
Since the thread motor 6 is controlled at a constant speed by the interruption every N lines from the track counter 13,
The track actuator 4 is controlled so as not to go out of the movable range. During this time, the fastest seek control in which the track counter 15 can count M tracks is performed by the constant speed control of the track actuator 4.

Next, close the passage number of tracks of the initial target at the timing T ₁₉ in FIG. 6 at predetermined intervals before the target track (S29), the brake pulse is applied pickup 20 enters the stop operation (S30) . At this time, the track counter 13 is reset from an interrupt output every N lines to an interrupt output every several lines (S31), and the track counter 15 is reset to an interrupt output every one line.

[0045] Here, the time the track actuator 4 passes through the M tracks are constant speed controlled to be constant, the braking timing of the timing T ₁₉ in FIG. 6 is a How many previous number target track Can be adjusted exactly.

Next, the control microcomputer 14 can confirm that come to the target track by the interrupt number, and since it recognize that nearly stopped by measuring the interrupt interval, the target track at the timing T ₁₀ in FIG. 6 When it is detected by the interruption interval from the track counter 13 that the moving speed of the pickup 20 is almost stopped (S31), the brake pulse to the thread motor 6 is released (S32).

On the other hand, for the track actuator 4, shortly before the target track by a predetermined interval (S38), the second interrupt signal from the track counter 15 changes from an output every M lines to an interrupt output every several lines smaller than M lines. The setting is reset (S39). Then, by releasing the brake pulse to the sled motor 6 (S40), a brake pulse is applied (S41).

Further, one of the tracks from the track counter 15
Accurately measures the transit time for each and adjusts the brake pulse
Alternatively, apply a kick pulse in the opposite direction to
Gu T ₁₁On the target track (S42)
The actuator 4 is stopped (S43). FIG.
Imming T_{twenty one}So, as an example, the track
When the interrupt signal of the counter 15 is received,
Shows the case where a kick pulse is applied for a predetermined period and stopped.
Have been. Then, the movement of the track actuator 4
After stopping, the track actuator 4
A lock control command is sent (S44). The timing T in FIG.
₂₀To timing T_{twenty one}While the thread motor 6 stops
Therefore, a micro seek operation is performed.

[0049] Finally, the behavior of the track actuator 4 is stabilized, thereby fully in FIG. 6 a timing T ₁₂ is a time when the on-track control is made to resume tracking control of the thread motor 6 (S45).

As described above, the pick-up movement speed can be controlled while the microcomputer 14 grasps the number of passing tracks and the passing time between the tracks by using the track counter 13, and more precise by using the track counter 15. Since the control microcomputer 14 can grasp the number of passing tracks and the passing time between the tracks, the track actuator 4 can be accurately controlled at a constant speed. At this point, the track error signal is a traverse signal having a constant period. This makes it easy to grasp the brake start timing, stop the pickup on the target track,
In addition, the track actuator 4 can be efficiently returned to the on-track control.

In the above embodiment, an optical disk device is described as a recording / reproducing device. However, the present invention is not limited to this, and can be applied to a magnetic disk or the like.

[0052]

Since the present invention is configured as described above, it has the following effects.

Track counting means for counting the number of tracks traversed by the recording / reproducing head and outputting an interrupt signal at every predetermined count, and control means for controlling the driving means so that the time interval between the interrupt signals is constant. Is provided, a high-speed and accurate seek operation can be performed.

Also, the track count means is N (N:
(Natural number) The first that outputs the first interrupt signal for each count
And a driving means having a sled direction driving means for moving the recording / reproducing head in a sled direction, and a control means for controlling a time interval of the first interrupt signal to be constant. By controlling the sled direction driving means, the recording / reproducing head can be macroscopically moved at a constant speed.

Further, the control means controls the sled direction drive means so as to apply a brake to the movement of the recording / reproducing head at a predetermined interval before the target track in the seek operation, so that the recording / reproducing head can be accurately positioned on the target track. Can be stopped.

Further, the first track counting means sets the output of the first interrupt signal at every count smaller than N counts before the predetermined interval of the target track, whereby the recording / reproducing head can be accurately decelerated.

Further, the track counting means is M
(N≫M, M: natural number) a second track counting means for outputting a second interrupt signal for each count, a driving means having a track actuator for moving the recording / reproducing head in a tracking direction, The control means controls the track actuator so as to make the time interval of the second interrupt signal constant so that the recording / reproducing head can be microscopically moved at a constant speed.

Further, the control means controls the track actuator so as to apply a brake to the movement of the recording / reproducing head short of the target track by a predetermined distance.
The recording / reproducing head can be accurately stopped at the target track.

Further, the second track counting means includes:
The deceleration of the recording / reproducing head can be accurately performed by setting the output of the second interrupt signal at a count smaller than M counts before a predetermined interval before the target track.

Further, by providing an interrupt step of outputting an interrupt signal at every predetermined count and a control step of controlling the driving means so that the time interval of the interrupt signal is constant, the recording / reproducing head can be operated at high speed. And can move accurately.

Further, in the interruption step, a movement between the tracks is counted during a seek operation, and a first interruption signal for outputting a first interruption signal every N (N: natural number) is outputted. By controlling the sled direction driving means for moving the recording / reproducing head in the sled direction so as to make the time interval of the first interrupt signal constant, the recording / reproducing head can be macroscopically moved at high speed and accurately. it can.

In the interruption step, the movement between the tracks during the seek operation is counted and M (N≫M, M:
(A natural number) outputting a second interrupt signal at each count, and controlling a track actuator for moving the recording / reproducing head in the tracking direction so that the time interval of the second interrupt signal is constant in the control step. Accordingly, the recording / reproducing head can be microscopically and accurately moved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disk seek control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation according to the first embodiment of the present invention.

FIG. 3 is a timing chart showing operation timing according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of an optical disk seek control device according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation according to the second embodiment of the present invention.

FIG. 6 is a timing chart showing operation timing according to the second embodiment of the present invention.

FIG. 7 is a block circuit diagram for explaining a seek operation in the related art.

[Explanation of symbols]

1 optical disk, 3 optical system, 4 tracking actuator, 6 thread motor, 7 driver,
8 tracking error detector, 10 analog signal processing unit, 12 servo signal processing unit, 13 track counter, 14 control microcomputer, 15 track counter.

Claims (10)

[Claims] 1. A recording / reproducing head for recording information on an information recording medium or reproducing the recorded information, a driving unit for moving the recording / reproducing head in a direction across a track of the information recording medium, and the recording / reproducing head. During the seek, the number of tracks traversed by the recording / reproducing head is counted, and a track counting means for outputting an interrupt signal at every predetermined count; and the driving means are controlled so that the time interval between the interrupt signals is constant. A recording / reproducing apparatus comprising a control unit. 2. The method according to claim 1, wherein the track counting means is N (N:
(Natural number) The first that outputs the first interrupt signal for each count
Wherein the driving means has sled direction driving means for moving the recording / reproducing head in the sled direction, and the control means makes the time interval of the first interrupt signal constant. 2. The recording / reproducing apparatus according to claim 1, wherein said thread direction driving means is controlled. 3. The thread control device according to claim 2, wherein the control means controls the sled direction driving means so as to apply a brake to the movement of the recording / reproducing head short of a predetermined distance from the target track in the seek operation. The recording / reproducing apparatus as described in the above. 4. The apparatus according to claim 2, wherein said first track counting means outputs a first interrupt signal at every count smaller than N counts before a predetermined interval of said target track. Recording and playback device. 5. The method according to claim 1, wherein the track count means is M (N≫
M, M: a natural number) having a second track counting means for outputting a second interrupt signal for each count, the driving means having a track actuator for moving the recording / reproducing head in a tracking direction, the control means 3. The recording / reproducing apparatus according to claim 2, wherein the controller controls the track actuator so that a time interval of the second interrupt signal is constant. 6. The recording / reproducing apparatus according to claim 5, wherein the control means controls the track actuator so as to apply a brake to the movement of the recording / reproducing head before a predetermined interval from the target track. . 7. The apparatus according to claim 5, wherein the second track counting means sets the output of the second interrupt signal at every count smaller than M counts before a predetermined interval from the target track. Recording and playback device. 8. A recording / reproducing method comprising: a recording / reproducing head for recording information on an information recording medium or reproducing the recorded information; and a driving means for moving an upper recording / reproducing head in a direction crossing a track, wherein a seek operation is performed. Sometimes, a signal from the recording / reproducing head counts the number of tracks traversed by the recording / reproducing head, and outputs an interrupt signal at every predetermined count. A recording / reproducing method, comprising a control step of controlling the driving means. 9. In the interruption step, a movement between the tracks is counted during a seek operation and N (N: natural number) is counted.
Outputting a first interrupt signal that outputs a first interrupt signal for each count; and moving the recording / reproducing head in the thread direction so that the time interval of the first interrupt signal is constant in the control step. 9. The recording / reproducing method according to claim 8, wherein a sled direction driving means to be driven is controlled. 10. In the interrupt step, the movement between the tracks during a seek operation is counted and M (N≫M,
M: a natural number) outputs a second interrupt signal at each count, and in the control step, a track actuator for moving the recording / reproducing head in the tracking direction so that the time interval of the second interrupt signal is constant. The recording / reproducing method according to claim 9, wherein the method is controlled.