JPH08335375A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE: To always stably move a head without disturbance of dust, etc., stuck to a sliding shaft of a carriage. CONSTITUTION: An optical head 1 is so constituted that a carriage 3 arranged with seek coils 2a and 2b on both side parts is supported by guide shafts 9a and 9b inserted into the carriage 3 freely movably along time guide shafts 9a and 9b. The optical head 1 is connected with an optical head driving circuit 10 for driving the optical head 1 by supplying an electric current to the seek coils 2a and 2b, which is then connected with a CPU 11. Before performing an initial operation after supplying a power source, the optical head 1 is moved over between an inner circumferential side stopper 12 and an outer circumferential side stopper 13 for regulating the moving amt. of the optical head 1, arranged in an inner circumferential position and an outer circumferential position of an optical disk 5 by the CPU 11, so that foreign matter 15 such as dust, etc., stuck to the guide shafts 9a and 9b is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording / reproducing / erasing information on / from an information recording medium.

[0002]

2. Description of the Related Art In an information recording / reproducing apparatus which uses a disk-shaped information recording medium, a mechanism for linearly moving a head for recording / reproducing information from the inner circumference to the outer circumference of the information recording medium is provided. Generally prepared.

For example, an optical disk device for optically recording and reproducing information has an optical head composed of an actuator for driving an optical system and a carriage for holding the actuator, and the carriage of the optical head is a guide shaft. A head moving mechanism having a structure for movably supporting the head is provided. With such a configuration, the optical head can be linearly moved from the inner circumference to the outer circumference of the optical disc.

FIG. 5 shows an example of the structure of an optical head that has been used conventionally. The optical head 51 is configured to include an actuator 52 that drives an internal optical system and a carriage 53 that holds and fixes the actuator 52. Eight bearings 54 are rotatably fixed to both sides of the carriage 53. Of the eight bearings 54, the four bearings on the upper side shown in the drawing contact the upper portions of the two guide shafts 55 arranged in parallel with each other, and the remaining four bearings on the lower side are inclined. It is in contact with the guide shaft 55 from below 45 degrees. With this configuration, the optical head 51 is slidably supported by the guide shaft 55 and the bearing 54 along the guide shaft 55, and can move linearly only in the direction parallel to the guide shaft 55.

Recording / reproducing at any position on the information recording medium
When erasing, the optical head 51 is first moved to the position of the corresponding track along the guide shaft 55 by a driving means such as a linear motor. After completing the move,
Information is recorded, reproduced, and erased by irradiating a target track on the medium with a light beam while driving and controlling the optical system by the actuator 52 of the optical head 51 to perform focusing and tracking.

When the optical head is linearly moved by the structure as shown in FIG. 5, if dust or dust adheres to the guide shaft, the frictional resistance between the optical head and the guide shaft increases, and the optical head moves smoothly in parallel. There is a problem that it cannot move to an arbitrary position without moving. In order to reduce such frictional resistance, it is necessary to remove dust, dust, etc. attached to the guide shaft.

Therefore, as a foreign matter removing means for removing dust and the like on the guide shaft, Japanese Patent Laid-Open No. 1-222727 has been proposed.
Japanese Patent Publication No. 6 proposes a device provided with a head moving mechanism having a configuration as shown in FIG. With this configuration, in the optical head 61, the carriage 63 has eight bearings 6
A dust storage case 66 that covers the contact portions of the four and two guide shafts 65 is fixed. The garbage storage case 66 is
Cleaning brushes 67 are attached to the through holes at both ends to close the gap with the guide shaft 65. The cleaning brush 67 is attached so as to be inclined inward so that the abrasion powder does not come out of the dust storage case 66. Further, inside the dust storage case 66, a static electricity generating means 68 is provided as a foreign matter adsorbing means for adsorbing the abrasion powder so as not to float.

With this structure, as shown in FIG. 7, the abrasion powder generated by the contact movement of the bearing 64 and the guide shaft 65 is confined in the dust storage case 66, and the abrasion powder adhering to the guide shaft 65 is removed by the cleaning brush 67. By removing it, it is possible to prevent dust and dirt from adhering to the guide shaft.

[0009]

By the way, in the configuration of FIG. 6 described above, the dust accommodating case 66 is fixed to the optical head 61, and the dust accommodating case 66 closes the gap with the guide shaft 65. 67 is attached so that abrasion powder does not float. Only when the optical head 61 moves to seek, it is possible to remove dust and dirt attached to the portion of the guide shaft 65. When the optical head 61 does not move much to seek, dust and dust adhere to the guide shaft 65. Will remain.

The guide shaft 65 is the carriage 6
Since it has a function as the sliding shaft of No. 3, the dynamic frictional resistance of the carriage 63 is likely to increase due to the attached dust and dust. Therefore, if there is a portion on the guide shaft 65 where dust, dirt, and the like are not removed, as described above, the carriage 63 at this portion.
Therefore, the frictional resistance of the guide shaft 65 increases, and the movement of the carriage 63 is hindered.

The present invention has been made in view of these circumstances, and it is possible to remove foreign matter such as dust and dust adhering to the sliding shaft of the carriage at a predetermined timing, and always without being obstructed by the foreign matter. It is an object of the present invention to provide an information recording / reproducing device capable of stably moving a head.

[0012]

An information recording / reproducing apparatus according to the present invention supports a head for recording / reproducing information on / from an information recording medium, and supports the head movably in a radial direction of the information recording medium. A sliding shaft that also serves as a support means and a movement guide means for the head, a drive means for moving the head in the radial direction of the information recording medium, and an inner peripheral position of the information recording medium at a predetermined timing. To a peripheral position, the drive control means for controlling the drive means so as to move the information recording medium in order to regulate the movement amount of the head. Further comprises stopper means respectively disposed outside the recording areas at both ends in the radial direction, and the drive control means turns on the power of the information recording / reproducing apparatus at the predetermined timing. Before initial operation performed, the head stopper means of the inner peripheral side and outer peripheral side has a configuration for moving the head over between a position impinging respectively as the inner peripheral position and the outer position.

According to another aspect of the present invention, the drive control means sets the inner peripheral position and the outer peripheral position on the information recording medium as the inner peripheral position and the outer peripheral position at predetermined time intervals during the operation of the information recording / reproducing apparatus as the predetermined timing. The head is configured to be moved between specific track positions on the side and the outer peripheral side.

According to a third aspect of the present invention, there is further provided count means for counting the number of trials of moving the head to a target track during operation of the information recording / reproducing apparatus, and the drive control means sets the predetermined timing as the predetermined timing. When the number of trials of movement obtained by the counting means reaches a predetermined number, the head is provided as the inner peripheral position and the outer peripheral position between specific track positions on the inner peripheral side and the outer peripheral side on the information recording medium. It is configured to move.

[0015]

With the above construction, foreign matter adhering to the sliding shaft is removed by moving the head from the inner peripheral position to the outer peripheral position of the information recording medium at a predetermined timing, thereby removing the head. It is possible to stably move along the sliding axis when moving.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a structure of a head moving mechanism of an information recording / reproducing apparatus according to an embodiment of the present invention.

In the present embodiment, as an example of an information recording / reproducing apparatus, an optical disc apparatus for optically recording / reproducing will be taken as an example to describe a configuration example of the periphery of a head movable mechanism.

An optical head 1 as a head for recording / reproducing information on / from an information recording medium has seek coils 2 on both sides.
The carriage 3 is provided with a and 2b, and the actuator having the objective lens 4 is provided in the carriage 3.

On both sides of the optical head 1, outer yokes 6 are provided in the radial direction of an optical disk 5 as an information recording medium.
a, 6b, permanent magnets 7a, 7b, and inner yokes 8a, 8b are arranged in parallel and symmetrically. The seek coils 2a and 2b of the optical head 1 have inner yokes 8
a and 8b are inserted into the carriage 3 of the optical head 1,
Guide shafts 9a and 9b provided in parallel with the inner yokes 8a and 8b and the outer yokes 6a and 6b are inserted, and the carriage 3 is held by the guide shafts 9a and 9b. That is, the guide shafts 9a and 9b have a function of a sliding shaft that also functions as a support member that supports the carriage 3 and a guide member that guides the movement of the carriage 3.

In the head moving mechanism of the optical head 1 constructed as described above, the outer yokes 6a and 6b, the permanent magnets 7a and 7b, the inner yokes 8a and 8b, and the seek coil 2 are used.
A voice coil type linear motor is constituted by the magnetic circuits a and 2b. The seek coils 2a and 2b of the optical head 1 are electrically connected to an optical head drive circuit 10, and the optical head drive circuit 10 drives and controls the optical head 1. The optical head drive circuit 10 is connected to a CPU 11 that controls each part of the apparatus, and its operation is controlled by an instruction from the CPU 11.

At both ends of the moving range of the optical head 1, the optical head 1 on the inner circumference side and the outer circumference side of the optical disk 5 is provided.
An inner peripheral side stopper 12 and an outer peripheral side stopper 13 are arranged to regulate the movement amount of the. These inner stoppers 1
2, the outer peripheral side stopper 13 is the optical head 1 that has moved
It consists of a damper that receives and stops it.

A spindle motor 14 for rotating the optical disk 5 is provided near the optical head 1.

The CPU 11 sends an instruction to the optical head drive circuit 10 to move the optical head 1 from the inner circumference to the outer circumference at a predetermined timing.

Now, the operation of moving the optical head 1 at a predetermined timing will be described in detail. In the first embodiment, the optical head 1 is moved over the entire movable range from the inner circumference to the outer circumference at a predetermined timing before performing the initial operation.

After the head moving operation, as the initial operation, the optical head 1 emits a light beam to apply focus servo and track servo to the track on the optical disk 5, and the light beam emission amount adjusting operation. Then, recording and reproduction are made possible.

When the optical disk device is powered on, the CPU 11 sends an instruction to move the optical head 1 to the optical head drive circuit 10 before performing the initial operation.

In response to the instruction from the CPU 11, the optical head drive circuit 10 supplies a current to the seek coils 2a and 2b of the optical head 1 so that the optical head 1 is moved along the guide shafts 9a and 9b. Inner peripheral direction α
To the inner circumference side stopper 12, and the carriage 3 collides with the inner circumference side stopper 12. After this movement in the inner peripheral direction, the optical head 1 is moved in the outer peripheral direction β of the optical disc 5 to the outer peripheral side stopper 13, and the carriage 3 collides with the outer peripheral side stopper 13.

Due to the movement operation of the optical head 1, dust adhered to the guide shafts 9a and 9b at a portion in contact with the guide shafts 9a and 9b of the optical head 1,
The foreign matter 15 such as dust is removed. By this guide shaft cleaning operation, the optical head 1 and the carriage 3
It is possible to reduce the frictional resistance caused by the foreign matter 15 between the guide shafts 9a and 9b serving as the sliding shafts, and the optical head 1 can be moved stably.

Further, since the movement operation of the optical head is performed before the optical disc apparatus is powered on and the initial operation is performed, it does not affect the data access time at the time of performing processing such as recording and reproduction. , After the initial operation,
The optical head can always be stably moved.

Further, if the movement of the optical head is performed even at the timing when the power of the optical disk device is turned off, the dust and the like attached to the guide shafts 9a and 9b can be removed during the operation of the optical disk device. You can As a result, it is possible to reduce the amount of dust, dust, etc. adhering to the guide shafts 9a, 9b when the optical disk device is powered on.

As described above, in this embodiment, the timing for moving the optical head 1 in the radial direction of the optical disk 5 is before the initial operation after the power is turned on, so that the guide shaft cleaning operation can be performed before the data access. Therefore, the data access time is not extended due to the foreign matter removal.

Further, since the movement of the optical head 1 is restricted by the stoppers 12 and 13 on the inner peripheral side and the outer peripheral side, the optical head 1 can be moved to the stoppers 12 and 13 at high speed, and The force for removing foreign matter due to the contact resistance of the guide shafts 9a and 9b can be increased. In addition, the guide shaft 9a extends over a wide area beyond the range in which the optical head 1 moves during the data access operation.
The foreign matter attached to 9b can be removed.

Further, the movement of the optical head 1 is performed in a state where the focus servo and the track servo before the initial operation are off, that is, without focusing or tracking the optical head 1 on the optical disk 5, a focus which is an actuator of the optical head 1. Since the coil and track coil are set free, the optical head 1
The impact on the actuator, such as an excessive current flowing through the focus coil and the track coil when the collision with the stoppers 12, 13 is small. Further, there is no need to turn the focus servo and the track servo off and on because of the movement operation of the optical head 1.

As another embodiment, a modification of the operation of moving the optical head 1 at a predetermined timing will be described below.

FIG. 2 is a flow chart showing the movement operation of the optical head in the second embodiment, and FIG. 3 is an explanatory view showing the schematic construction of the optical disc.

In the second embodiment, the optical head 1 is moved from the inner circumference to the outer circumference of the optical disc 5 at a predetermined time interval after the initial operation as a predetermined timing. Here, the schematic configuration of the optical disc 5 will be described with reference to FIG. As the optical disk 5, a magneto-optical disk made of a magneto-optical recording medium or the like is used. The optical disc 5 is provided with a user area 21 that can be used by a user to write and read data, and tracks are formed in a concentric or spiral shape from the innermost track 22 to the outermost track 23 of the user area 21. ing. An SFP area 24, which serves as a control track area, is provided on the inner and outer circumference sides of the user area 21, respectively.
25 are provided.

When the optical disk device is powered on and the optical disk 5 is inserted, the CPU 11 executes step S1 of FIG. 2 (hereinafter, steps will be omitted and referred to as S1).
The initial operation described above is performed. Then, in S2, it is determined whether or not a fixed time has passed. If the fixed time has not passed, in S3, operations such as seek, recording, erasing, and reading are continued.

If a certain time has passed in S2, the CPU
Reference numeral 11 interrupts each operation such as seeking, recording, erasing, and reading in S4, and sends an instruction to move the optical head 1 to the optical head drive circuit 10 in S5. In response to the instruction from the CPU 11, the optical head drive circuit 10 supplies a current to the seek coils 2a and 2b of the optical head 1, and the carriage 3 is turned on while the focus servo and the track servo are turned on.
To move.

At this time, first, the optical head 1 is seek-moved to the SFP area 24 on the inner circumference side of the optical disk 5, and then the optical head 1 is seek-moved to the SFP area 25 on the outer circumference side. By this movement operation of the optical head 1, the foreign matter 15 such as dust and dust attached to the guide shafts 9a and 9b can be removed.

When the guide shaft cleaning operation for moving the optical head is completed in S6, S7 is executed.
Then, the suspended operations such as seeking, recording, erasing, and reading are restarted, and the process returns to S2 to repeat the above-mentioned operations. That is, after restarting each operation, each operation such as seeking, recording, erasing, and reading is continuously performed until a certain time has elapsed, and when the certain time has elapsed, the operation of moving the optical head again is performed.

By performing such an operation, the foreign matter 15 between the optical head 1 and the guide shafts 9a and 9b as the sliding shafts of the carriage 3 is regularly removed even when the optical disk device is in operation. Therefore, the optical head 1 can be moved stably.

As described above, in the present embodiment, it is determined that dust, dirt, and the like have adhered to the guide shafts 9a and 9b after a lapse of a certain period of time during the operation of the optical disk device, and the optical system is operated every a certain period of time. By moving the head 1 to the entire user area of the optical disk 5, the optical head 1
Since it is possible to remove dust, dust, etc. even at the position that does not move during the data access operation within a certain time,
During the operation of the optical disc device, the seek movement of the optical head is always stable from the innermost circumference to the outermost circumference of the medium. The fixed time for moving the optical head can be set arbitrarily.

Further, the inner and outer peripheral positions where the optical head 1 is moved are set to specific tracks on the optical disc 5 (in the second embodiment, the SFPs on the inner and outer peripheral sides of the optical disc 5).
By setting the areas 24 and 25) and controlling the driving of the optical head 1 so as to move between these tracks, it is possible to always recognize which track on the optical disk 5 the optical head 1 is currently located. After removing the foreign matter on the shaft, the optical head can be easily returned to the track where the processing was originally stopped.

In the first embodiment, the focus servo and the track servo outside the recording area are not applied between the inner peripheral stopper 12 and the outer peripheral stopper 13 in the optical head in a state where the focus servo and the track servo are off. By moving the optical head to the position, the moving operation of the optical head can be executed at high speed. However, in the second embodiment, a specific track from the inner peripheral position to the outer peripheral position with the focus servo and the track servo turned on. By moving the optical head, it is possible to immediately position the optical head at a desired position without having to perform the initial operation again after the moving operation of the optical head.

FIG. 4 is a flow chart showing the movement operation of the optical head in the third embodiment. In the third embodiment,
As a predetermined timing, when the seek movement to the target track fails, for example, three times, the optical head 1 is moved from the inner circumference to the outer circumference of the optical disk 5. Here, the optical head 1 is set to the current track (A Track).
Consider the operation of seek-moving from the target track (B Track).

When performing a seek operation to the target track during the data access operation after the initial operation or in the standby state, the CPU 11 first at S11 of FIG. 4, the current position (A Tr of the optical head 1 on the optical disk 5).
ack) is confirmed. Then, in S12, the seek count is set to n
And n = 0 is set as the initial count. Then S13
Then, the CPU 11 sends an instruction to move the optical head 1 to the optical head drive circuit 10, and supplies a current to the seek coils 2a and 2b of the optical head 1 from the optical head drive circuit 10 to make the optical head 1 a target track ( B Trac
Seek to k).

After that, in S14, it is determined whether or not the seek movement can be made to the target track. If the seek movement fails, in S15, n = n + 1 is set as the current number of seeks. After that, in S16, it is determined whether or not the number of seeks n is 3 or more. If n is less than 3, the process returns to S13 and the above process is repeated until the seek movement fails 3 or more times.

When the seek count n becomes 3 or more in S16 and the seek movement to the target track fails three times, CP
U11 determines that the seek movement has failed due to the influence of foreign matter 15 such as dust and dust attached to the guide shafts 9a and 9b, and sends an instruction to move the optical head 1 to the optical head drive circuit 10 in S17, The optical head drive circuit 10 supplies a current to the seek coils 2a and 2b of the optical head 1 to move the carriage 3 while the focus servo and the track servo are on.

At this time, first, the optical head 1 is seek-moved to the SFP area 24 on the inner circumference side of the optical disk 5, and then the optical head 1 is seek-moved to the SFP area 25 on the outer circumference side. By this movement operation of the optical head 1, the foreign matter 15 such as dust and dust attached to the guide shafts 9a and 9b can be removed.

When the guide shaft cleaning operation for moving the optical head is completed, the optical head 1 is moved to seek the target track (B Track) in S18.

On the other hand, when the seek movement to the target track is successful in the number of seek times of 2 times or less in the processing of S13 to S16, the influence of the foreign matter 15 such as dust and dust adhering to the guide shafts 9a and 9b is exerted. If it is not, the guide shaft cleaning operation is terminated without moving the optical head 1 from the inner circumference to the outer circumference of the optical disk 5 while keeping the optical head 1 tracking the target track.

In the above operation, the seek movement trial number n for judging that the seek operation has failed due to the influence of the foreign matter 15 such as dust and dust is set to 3, but this n may be appropriately changed.

By carrying out such an operation, the optical head 1 is protected from dust and dirt during operation of the optical disk device.
Even if the seek movement cannot be performed normally, the optical head 1 can be moved to remove the foreign matter 15 between the guide shafts 9a and 9b as the slide shafts of the carriage 3, so that subsequent seek operation failure can be prevented. The number can be reduced, and the optical head 1 can always be normally moved to seek a target track.

As described above, in the present embodiment, it is determined whether or not foreign matter such as dust or dust is attached to the guide shafts 9a and 9b based on the number of seek movement trials to the target track, and the seek movement is normal. When it becomes impossible to remove the foreign matter, the optical head 1 can be moved to remove the foreign matter. As a result, the guide shaft cleaning can be performed every time the foreign matter adheres to the guide shafts 9a and 9b, so that the foreign matter adhered to the guide shaft is not obstructed during the seek movement operation of the optical disc device.
The seek movement of the optical head is always stable.

Further, similarly to the second embodiment, by moving between specific tracks from the inner peripheral position to the outer peripheral position with the focus servo and the track servo turned on, the initial operation is performed again after the movement operation of the optical head. The optical head can be immediately positioned at a desired position without the need.

According to each of the embodiments described above, the carriage of the optical head is moved from the inner peripheral position to the outer peripheral position of the information recording medium at a predetermined timing so that the carriage is attached to the guide shaft as the sliding shaft of the carriage. garbage,
It is possible to remove dust and the like. Therefore, the optical head can always be moved stably without being hindered by foreign matter.

In each of the above-described embodiments, the number of times the optical head is moved between the inner circumference and the outer circumference in the radial direction of the optical disk is set to one. However, if the number of times of this movement is increased, the guide is moved. It is possible to further improve the effect of removing dust and dirt attached to the shaft.

Further, the invention is not limited to the optical disk device using the optical disk such as the magneto-optical recording medium described in each of the embodiments,
The concept of the present embodiment can be similarly applied to any information recording / reproducing apparatus having a head moving mechanism having a similar structure using a guide shaft.

[0059]

As described above, according to the present invention, dust attached to the sliding shaft of the carriage at a predetermined timing,
There is an effect that foreign matter such as dust can be removed, and the head can always be stably moved without being disturbed by the foreign matter.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a head moving mechanism of an information recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a movement operation of the optical head in the second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a schematic configuration of an optical disc.

FIG. 4 is a flowchart showing the movement operation of the optical head in the third embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration example of a conventional optical head having a head moving mechanism having a structure in which a carriage of the optical head is supported by a guide shaft.

FIG. 6 is a perspective view showing a configuration example of an optical head provided with a means for removing foreign matter such as dust and dirt attached to a guide shaft.

7 is a cross-sectional view showing the internal structure of foreign matter removing means of the optical head shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical head 2a, 2b ... Seek coil 3 ... Carriage 5 ... Optical disk 6a, 6b ... Outer yoke 7a, 7b ... Permanent magnet 8a, 8b ... Inner yoke 9a, 9b ... Guide shaft 10 ... Optical head drive circuit 11 ... CPU 12 ... Inner peripheral side stopper 13 ... Outer peripheral side stopper 15 ... Foreign matter

Claims (3)

[Claims] 1. A head for recording / reproducing information on / from an information recording medium, a supporting means for movably supporting the head in a radial direction of the information recording medium, and a movement guide means for the head. A sliding shaft, a drive means for moving the head in a radial direction of the information recording medium, and a moving means for moving the head over a range from an inner peripheral position to an outer peripheral position of the information recording medium at a predetermined timing. Drive control means for controlling a drive means, and stopper means respectively arranged outside the recording areas of both ends in the radial direction of the information recording medium for restricting the movement amount of the head, The drive control means sets the inner peripheral position and the outer peripheral position as the inner peripheral position and the outer peripheral position before the initial operation performed when the information recording / reproducing apparatus is powered on at the predetermined timing. Tsu information recording and reproducing apparatus characterized by path means to the head moves the head over between a position impinging respectively. 2. A head for recording and reproducing information on and from an information recording medium, a supporting means for movably supporting the head in a radial direction of the information recording medium, and a movement guide means for the head. A sliding shaft, a drive means for moving the head in a radial direction of the information recording medium, and a moving means for moving the head over a range from an inner peripheral position to an outer peripheral position of the information recording medium at a predetermined timing. Drive control means for controlling a drive means, wherein the drive control means has the inner peripheral position and the outer peripheral position as the predetermined timing for each predetermined time interval during operation of the information recording / reproducing apparatus. An information recording / reproducing apparatus characterized in that the head is moved over a specific track position on an inner peripheral side and an outer peripheral side on a recording medium. 3. A head for recording / reproducing information on / from an information recording medium, a supporting means for movably supporting the head in a radial direction of the information recording medium, and a movement guide means for the head. A sliding shaft, a drive means for moving the head in a radial direction of the information recording medium, and a moving means for moving the head over a range from an inner peripheral position to an outer peripheral position of the information recording medium at a predetermined timing. Drive control means for controlling the drive means, and count means for counting the number of trials of movement of the head to a target track during the operation of the information recording / reproducing apparatus. When the number of movement trials obtained by the counting means reaches a predetermined number of times, the inner circumference side on the information recording medium is set as the inner circumference position and the outer circumference position. Information and moving said head over during a specific track position in fine outer peripheral side recording and reproducing apparatus.