JPH11175905A - Magnetic head driving mechanism for magneto-optical disk recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost and required space by making a drive source for driving a magnetic head as an optical pickup transfer motor transferring an optical pickup for recording/reproducing. SOLUTION: In a magneto-optical disk recording/reproducing device provided with the optical pickup irradiating a laser spot on a signal recording track on a magneto-optical disk and the magnetic head 4 coming into contact with the magneto-optical disk and applying a magnetic field from the rear surface of the laser spot, the magnetic head 4 is separated/touched from/to the magneto- optical disk through a carrier gear 12 of a planet gear mechanism, a magnetic head drive slider 5, a unidirectional clutch 7, a cam 8 and an arm 9 by the rotation of the optical pickup feed motor transferring the optical pickup.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk recording / reproducing apparatus, and more particularly to a magnetic head drive mechanism for applying a magnetic field by contacting a magneto-optical disk.

[0002]

2. Description of the Related Art Mini discs (MD) known as rewritable magneto-optical discs include a pre-mastered mini disc and a recordable mini disc. The premastered mini disc is a read-only disc, in which information is recorded by pits, and the information is reproduced by reflected light of a laser spot from an optical pickup.

[0003] A recordable minidisc has a recordable area outside the pit information area on the inner peripheral side, in which a groove (groove) for guiding a track is dug instead of having no pit. Information is recorded along this groove. Recording is performed by magnetization of a magnetic film. That is, the magnetic film is heated by a laser spot to a temperature higher than the Curie point, a magnetic field of a magnetic head that reverses according to a signal is applied thereto, and when the magnetic film is cooled, a signal is recorded on the magnetic film as a change in magnetization. The rotation direction of the plane of polarization of the reflected light of the laser beam differs depending on the direction of magnetization of the magnetic film, and information is reproduced by detecting a change in the plane of polarization of the reflected light of the laser spot.

[0004] In a recording / reproducing apparatus for recording / reproducing such a magneto-optical disk, a magnetic field is not applied to the magneto-optical disk when information is reproduced, but a magnetic field is applied to record information. If the magnetic head for applying a magnetic field is pressed against the magneto-optical disk when reproducing information, the frictional resistance is large and abrasion or excessive power consumption occurs. Therefore, it is desirable to separate the magnetic head from the magneto-optical disk. Therefore, conventionally, a magnetic head has been moved to and away from a magneto-optical disk by a magnetic head driving mechanism by reproducing or recording information.

Further, in the magneto-optical disk recording / reproducing apparatus, the recording / reproducing section is floated by an elastic member so that an external signal is not transmitted to the recording / reproducing section in order to track the laser spot on the signal recording track of the rotating disk. There is a need. Conventionally, there are two types of insulation systems: floating the whole mechanism, and CD.
There is a system in which only a recording / reproducing unit is floated like a player.

In the former case, the driving source of the magnetic head drive mechanism can be taken from the loading system because the loading system of the optical disk is also floating, but the slot-in type is a rotary drive mechanism of the upper roller, which is inferior in quality as a stationary type. It is necessary to provide another power transmission mechanism in the magnetic head drive mechanism.

When an optical disk is loaded by a tray that enters and exits the housing, a magnetic head drive mechanism can be driven by an extra stroke of a tray loading slider. However, a tray panel that opens and closes the tray entrance and its drive. A mechanism is required and the manufacturing cost increases. In addition, there is a problem that the quality is poor because the tray protruding from the housing floats.

In the latter method of floating only the recording / reproducing section, the driving source of the magnetic head driving mechanism cannot be taken from the loading system, and it is necessary to provide a separate driving source for the magnetic head driving mechanism in the recording / reproducing section. There is a problem that the manufacturing cost increases.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a recording / reproducing apparatus in a magneto-optical disk recording / reproducing apparatus of a type in which only a recording / reproducing section is floated. It is an object of the present invention to provide a magnetic head driving mechanism that does not require a driving source in addition to the driving source for the magnetic head.

[0010]

A magnetic head drive mechanism according to the present invention comprises an optical pickup for irradiating a laser spot on a signal recording track of a magneto-optical disk, and a back surface of the laser spot in contact with the magneto-optical disk. And a magnetic head for applying a magnetic field from the optical disk, wherein the magnetic head is moved toward and away from the magneto-optical disk by rotation of an optical pickup feed motor for feeding the optical pickup.

Further, in the magnetic head driving mechanism,
The optical pickup feed motor selectively drives a pickup table and a magnetic head drive slider via a planetary gear mechanism, a lock arm locks one of the pickup table and the magnetic head drive slider, The magnetic head drive slider is driven by rotation of the optical pickup feed motor in the same direction after the pickup table is sent to the end of the movement stroke.

Further, in the magnetic head driving mechanism, the magnetic head driving slider rotates a magnetic head driving cam via a one-way clutch, and the magnetic head is driven by the magnetic head driving cam. The optical disk is configured to be separated from and connected to the magneto-optical disk.

[0013]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a main part of a magnetic head drive mechanism of a mini disc recording / reproducing apparatus according to an embodiment of the present invention. The member shown in FIG. 1 supports a recording / reproducing unit, and is supported by a floating chassis (not shown) floating from the main body chassis by an elastic member.

The pickup table 1 has a fitting hole 1a and an engaging portion 1
b movably supports the floating chassis. The rack 1c provided on the pickup table 1 meshes with the external teeth of the internal gear 14 of the planetary gear mechanism. The magnetic head drive slider 5 is movably supported by the floating chassis. The rack 5b provided on the magnetic head driving slider 5 is a carrier gear 1 of the planetary gear mechanism.
2 is engaged.

An optical pickup 2 is mounted on a pickup table 1, and a magnetic head arm 3 is rotatably supported. A magnetic head 4 is attached to the tip of the magnetic head arm 3, and the magnetic head 4 is arranged at a position facing the optical pickup 2 with the loaded mini disk interposed therebetween. The magnetic head arm 3 is urged by a spring (not shown) in a direction in which the magnetic head 4 is pressed against the mini disk.

The above-described planetary gear mechanism is shown in detail in FIG. An optical pickup feed motor (not shown) is fixed to a floating chassis, and its rotation is controlled by a gear transmission mechanism (not shown).
It is conveyed to 1. A shaft 15 erected on the floating chassis rotatably supports the sun gear 11 and the internal gear 14.

The carrier gear 12 is mounted on the sun gear 11, and the upright shaft is provided with planetary gears 13, 13, 13
Is rotatably supported. Planetary gears 13, 13, 13
Meshes with the internal gear of the internal gear 14 and the small gear of the sun gear 11. When the internal gear 14 of the planetary gear mechanism configured as described above is stopped, the carrier gear 12 is rotated,
When the carrier gear 12 is stopped, the internal gear 14 is rotated.

A lock arm 6 rotatably supported by the floating chassis locks one of the pickup table 1 and the magnetic head drive slider 5. That is, the shaft 6a of the lock arm 6 is engaged with the J-shaped groove 5a of the magnetic head driving slider 5 and the J-shaped groove 1d of the pickup table 1, and is clockwise viewed from above in FIG. Being energized.

FIG. 5 shows that the shaft 6a of the lock arm 6 enters a bent portion from a portion extending in the moving direction of the J-shaped groove 5a of the magnetic head driving slider 5, and the magnetic head driving slider 5 is locked by the lock arm 6. FIG. The lock arm 6 is biased by a spring and is stable at this position. At this time, the carrier gear 12 does not rotate, the internal gear 14 rotates, and the pickup table 1 is driven in the illustrated C and D directions.

When the pickup table 1 is driven to the moving end in the direction D (the inner circumferential direction of the mini-disc) as shown in the figure, the lock arm 6 is pulled in by the J-shaped groove 1d of the pickup table 1.
Is rotated counterclockwise in FIG. And axis 6
a enters a bent portion from a portion extending in the movement direction of the J-shaped groove 1da of the pickup table 1, and the pickup table 1
Is locked by the lock arm 6. The shaft 6a is J
The magnetic head drive slider 5 which is partially inserted in the moving direction of the shape groove 5a is movable.

FIG. 6 shows a state in which the magnetic head driving slider 5 is movable. At this time, the internal gear 14 does not rotate, the carrier gear 12 rotates, and the magnetic head driving slider 5 moves in the direction A shown in FIG. Driven in the B direction.

The arm 9 shown in FIG. 1 is rotatably supported by the floating chassis and is urged by a tension coil spring 10 in a counterclockwise direction as viewed from the lower left direction in the figure. The one-way clutch 7 and the cam 8 are rotatably supported by a bracket 17 fastened to a loading chassis. The input side gear of the one-way clutch 7 is engaged with a rack 5c provided on the magnetic head drive slider 5,
The output gear meshes with the gear of the cam 8.

The spring 16 is mounted on the floating chassis and presses against the elliptical convex portion 8a of the cam 8 to stabilize the cam 8 at two rotational positions. The shaft 8b erected on the cam 8 can be brought into pressure contact with the projection 9a of the arm 9, and the side surface of the arm 9 can come into contact with the projection 3a of the magnetic head arm 3. The output gear of the one-way clutch 7 transmits the rotation to the cam 8 only when the magnetic head driving slider 5 moves in the direction A in FIG.

FIG. 3 shows a state where the cam 8 stops at a position where the shaft 8b is held on the upper side. At this time, the projection 9a of the arm 9 is separated from the shaft 8b, and the arm 9 is turned counterclockwise in FIG. The magnetic head arm 3 is rotated clockwise by pressing the convex portion 3a of the magnetic head arm 3 in the clockwise direction.
In this state, the magnetic head 4 is separated from the loaded mini disk.

FIG. 4 shows a state in which the cam 8 is stopped at a position where the shaft 8b is held at the lower side. At this time, the projection 9a of the arm 9 is pushed by the shaft 8b, and the arm 9 rotates clockwise. The magnetic head arm 3 separates from the convex portion 3a of the magnetic head arm 3 and rotates counterclockwise. In this state, the magnetic head 4 is pressed against the loaded mini disk.

As described above, after the optical pickup feed motor sends the pickup to the inner circumferential position of the disk and further rotates in the same direction, the magnetic head driving slider 5 is sent, and the cam 8 is rotated so that the magnetic head is moved to the mini disk. Can be separated from and connected to. The mini disk is fed into a disk cartridge supported by the floating chassis by a loading mechanism (not shown), and the disk is clamped. After the clamping, the loading mechanism is separated from the floating chassis. The driving of the magnetic head is performed only by the members supported by the floating chassis.

As described above, since the magnetic head drive mechanism operates using the optical pickup feed motor, which is always necessary for the reproducing operation, as a drive source, the drive mechanism becomes simpler and the manufacturing cost is reduced as compared with the conventional one.

[0028]

According to the magnetic head drive mechanism of the magneto-optical disk recording / reproducing apparatus of the present invention, it is not necessary to provide a drive source for driving the magnetic head, thereby reducing the manufacturing cost and the required space. be able to.

Further, since the magnetic head drive mechanism and its drive source are mounted on the floating chassis supporting the recording / reproducing unit, there is no restriction on the structure of the insulation.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a magnetic head drive mechanism of a mini disc recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2A is an exploded perspective view showing a planetary gear mechanism of the magnetic head drive mechanism, and FIG. 2B is a side view showing a partial cross section of the planetary gear mechanism.

FIG. 3A is a side view showing a part of the magnetic head drive mechanism, and FIG. 3B is a front view showing a part of the magnetic head drive mechanism.

4 (a) is a side view showing another state of the portion shown in FIG. 3 (a), and FIG. 4 (b) is a front view showing another state of the portion shown in FIG. 3 (b). is there.

5A is a plan view showing a part of the magnetic head drive mechanism, and FIG. 5B is a plan view showing another state of the part shown in FIG. 5A.

[Explanation of symbols]

1 Pickup stand, 1a fitting hole, 1b engaging part, 1
c rack, 1d J-groove 2 optical pickup 3 arm, 3a convex portion 4 magnetic head 5 magnetic head drive slider, 5a J-shaped groove, 5b rack, 5c rack 6 lock arm, 6a shaft 7 one-way clutch 8 cam, 8a convex Part, 8b shaft 9 arm, 9a convex portion 10 tension coil spring 11 sun gear 12 carrier gear 13 planetary gear 14 internal gear 15 shaft 16 spring 17 bracket

Claims (3)

[Claims] An optical pickup for irradiating a laser spot on a signal recording track of a magneto-optical disk and a magnetic head for contacting the magneto-optical disk and applying a magnetic field from the back of the laser spot. In a reproducing apparatus, a magnetic head drive mechanism, wherein the magnetic head is moved toward and away from the magneto-optical disk by rotation of an optical pickup feed motor for feeding the optical pickup. 2. The optical pickup feed motor selectively drives a pickup table and a magnetic head driving slider via a planetary gear mechanism, and a lock arm includes one of the pickup table and the magnetic head driving slider. 2. The magnetic head drive according to claim 1, wherein one side is locked and the magnetic head drive slider is driven by rotation of the optical pickup feed motor in the same direction after sending the pickup table to the end of the movement stroke. mechanism. 3. The magnetic head drive slider rotates a magnetic head drive cam via a one-way clutch, and causes the magnetic head to move toward and away from the magneto-optical disk by the magnetic head drive cam. 3. The magnetic head drive mechanism according to claim 2, wherein: