JPH0550534U - Magneto-optical disk device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a magneto-optical disk device capable of accurately setting a relative position between a magnetic head and an optical head with a simple configuration. [Structure] A cartridge in which a base portion 100 and a disc cartridge accommodating a magneto-optical disc MOD are inserted and which is provided so as to be relatively distant and approachable with respect to the base portion 100 along the rotation axis direction of the magneto-optical disc MOD. Holder 200
And an optical head carriage 300 provided on either one of the base unit 100 and the cartridge holder 200 for slidably supporting the optical head in the radial direction of the magneto-optical disk MOD, and a magnetic head 420 provided on the other side in the radial direction. Magnetic head carriage 40 slidably supported on
0, the fixing hole 109 and the lever shaft 204 for fixing the positions of the cartridge holder 200 when the cartridge holder 200 approaches the base portion 100.
And a positioning means consisting of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic field modulation type overwritable magneto-optical disk device.

[0002]

[Prior Art]

 When re-recording information on a magneto-optical disk on which information has been recorded, in conventional magneto-optical disk devices, laser light of high power is continuously focused on the recording layer to raise the temperature to the Curie temperature, and the bias magnetic field is applied. After aligning the magnetization direction of the magnetic material in the same direction as during initialization, reverse the bias magnetic field to intermittently converge the high power laser light to the recording layer and reverse the magnetization direction. To record information.

In this method, it is necessary to rotate the disc at least twice for erasing and recording in order to rewrite information of one track, and there is a problem that the recording speed is slow.

Therefore, an overwritable device capable of rewriting information in one rotation by selectively applying a magnetic field of S or N to a minute region corresponding to a region where a laser beam is recently focused Is proposed.

In order to enable overwriting, it is necessary to focus the modulation magnetic field on a very small area of the disk. Therefore, in addition to the optical head, this type of device has a magnetic field slidable in the radial direction of the disk. A head is provided.

Further, the magneto-optical disc is provided in the disc cartridge, and the cartridge holder for holding the cartridge is provided with the optical head in order to set the magneto-optical disc to a recordable / reproducible position at the time of loading. It moves in the direction of the disc rotation axis with respect to the base.

The magnetic head is generally provided on the cartridge holder because it is necessary to apply a magnetic field to the magneto-optical disk from the side opposite to the optical head.

[0008]

[Problems to be solved by the device]

 However, in the above-described conventional magneto-optical disk device, there is a problem that the positional relationship between the magnetic head and the optical head tends to become unstable due to the movement of the cartridge holder. If the positions of both heads differ each time the cartridge holder moves, information cannot be recorded accurately.

Further, in order to accurately position the cartridge holder, including before and after its movement, the movement mechanism is required to have high accuracy, and the apparatus becomes complicated and large.

[0010]

[The purpose of the device]

 The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a magneto-optical disk device capable of accurately setting the relative position between the magnetic head and the optical head with a simple configuration. To aim.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the floating magnetic head drive mechanism according to the present invention has a base part and a disk cartridge for accommodating a magneto-optical disk inserted therein, and the base part and the rotational axis direction of the magneto-optical disk. Along with the cartridge holder, which can be relatively separated and approached, and one of the base part and the cartridge holder, which supports the optical head by sliding in the radial direction of the magneto-optical disk. A magnetic head carriage that is provided on the other side of the optical head carriage, base and cartridge holder to support the magnetic head slidably in the radial direction, and positioning that fixes the positions of the two when the cartridge holder approaches the base. And means.

[0012]

【Example】

 An embodiment of this invention will be described below.

First, the outline of the configuration and operation of the device will be described with reference to FIG.

When recording information on a magneto-optical disk, a magnetic field and heat are required. The magneto-optical disk drive device of the overwritable embodiment has an optical head having a laser light source for giving heat, and corresponds to the position on the magneto-optical disk where the laser light is converged by the optical head. It has a magnetic head that can selectively apply S and N magnetic fields to a very small area of the disk.

Further, since it is necessary to exactly match the convergence position of the laser light by the optical head and the region of the magnetic field applied by the magnetic head, a system for synchronously driving the magnetic head and the optical head is required. Becomes

As conceptually shown in FIG. 1, the magneto-optical disk drive device of the embodiment includes a base portion 100, a cartridge holder 200 into which a disc cartridge containing a magneto-optical disk is inserted, and a base portion 100. An optical head carriage 300 that moves the optical head in the radial direction of the disk along a guide rail that is fixed with respect to the magnetic head, and a magnetic head that moves in the radial direction of the disk along a guide rail that is fixed with respect to the cartridge holder. And a magnetic head carriage 400 that moves the magnetic head to the.

The cartridge holder 200 can move up and down along the rotation axis direction of the disc with respect to the base portion 100, and is in a position away from the base portion when the cartridge is attached and detached. Move to the direction close to the part 100 and set the magneto-optical disk to the recording / reproducing position.

The optical head carriage 300 and the magnetic head carriage 400 are provided with arms 301 and 401 respectively extending in the moving direction, and a light emitting / receiving element is provided as a set at the tip of the magnetic head side arm 401. Further, two sets of photo reflectors 402 and 403 are provided, and a white acrylic plate 302 as a reflecting plate is attached to the tip of the optical head side arm 301. Both carriages 300 and 400 are set so that the positions of both heads match when the outputs from the two light receiving elements become equal.

The optical head carriage 300 is driven in the radial direction of the disk by a signal from an external control device such as a computer, and the magnetic head carriage 400 has equal outputs from two light receiving elements by a synchronization circuit (not shown). The position is controlled so that As a result, the magnetic head carriage 400 can be moved in synchronization with the optical head carriage 300.

Next, the configuration of the entire apparatus will be described in more detail with reference to FIGS. 2 to 5.

On the outside of the cartridge holder 200, as shown in FIG. 2, a sliding plate which is guided by a guide roller provided in the base portion 100 and slides in the moving direction of each carriage shown by an arrow A in the figure. 250 are provided.

Three cam pins 201, 202, 203 are provided on the side surface of the cartridge holder that is in contact with the sliding plate 250, and the first and second cam pins 201, 202 are provided on two side surfaces of the sliding plate 250. The third cam pin 203 is engaged with the ascending / descending cam grooves 251 and 252, and is engaged with the ascending / descending position regulating guide groove 104 provided on the guide plate 103 fixed to the base portion 100.

The sliding plate 250 is constantly urged in the left side of the drawing by the tension spring 106 provided between the sliding plate 250 and the locking pin 105 provided on the base portion 100, that is, in the direction of moving the cartridge holder to the base side. Has been done.

When the cartridge holder 200 is set to the attachment / detachment position shown in FIG. 2, the sliding plate 250 is locked against the biasing force of the spring 106 by a stopper member (not shown).

The cartridge holder 200 is provided with a shutter opening / closing lever (not shown) for opening / closing the shutter of the disc cartridge, which is rotatable about a lever shaft 204. When the disc cartridge is inserted, the shutter opening / closing operation is performed. The lever is rotated to rotate the stopper release arm 107 provided on the base portion 100, and the locking by the stopper is released. The stopper release arm 107 is urged by a torsion spring 107a in a direction in which the stopper is kept locked by the stopper, that is, in a direction in which the disk cartridge is ejected.

When the locking is released, the sliding plate 250 slides due to the tensile force of the spring 106, and the cartridge holder 200 is moved by the action of the guide pins 201 and 202 and the cam grooves 251-252 as shown in FIG. It moves vertically to the base portion side until its lower surface comes into contact with the reference surface 108 provided on the base. At this time, due to the engagement of the guide pin 203 and the guide groove 104, the moving direction of the cartridge holder 200 is restricted only to the direction perpendicular to the disc.

The cartridge holder 200 is positioned by the reference surface 108 in a direction perpendicular to the disk surface, and the tip of the lever shaft 204 is fitted into the reference hole 109 provided in the base portion 100 to allow the inside of the disk surface. Is positioned in the direction of.

In order to keep the positional relationship between the magnetic head carriage 400 provided on the cartridge holder 200 and the optical head carriage 300 provided on the base unit 100 constant, rattling or the like is generated in the cartridge holder 200. It needs to be prevented. On the other hand, the cartridge holder 200 needs to be moved to insert and remove the disc cartridge. In order to accurately determine the position of the cartridge holder 200 before and after the movement, the precision of the moving mechanism is required to be high, and the device becomes complicated and large. In the apparatus of the embodiment, the position of the cartridge holder is accurately determined only when recording / reproducing with the disk cartridge inserted, so that the positional relationship between the magnetic head and the optical head can be accurately set without complicating the apparatus. It is possible.

The optical head carriage 300 is slidably supported by two guide shafts 110 and 111 fixed to the base portion 100 via bearings (not shown) as shown in FIG. It is driven by a linear motor configured by arranging coils 310 and 311 fixed at both ends of 300 around permanent magnets 120 and 121.

The optical head carriage 300 focuses a light flux from a laser light source (not shown) on the magneto-optical disk MOD by an objective lens, receives reflected light from the disk at the time of reproduction, reads a magneto-optical recording signal, and reproduces at the time of recording. The laser light is focused on the disk with a power higher than that of time to raise the temperature of the recording surface to the Curie temperature, and in cooperation with the magnetic head, the information is overwritten on the recording surface.

A mounting plate 500 is fixed to the upper surface of the cartridge holder 200 as shown in FIG. 5, and means for supporting and driving the magnetic head carriage 400 is integrally fixed on the mounting plate 500. ..

The magnetic head carriage 400 is slidably supported in the radial direction of the magneto-optical disc by two guide shafts 501 and 502, and the coils 410 and 411 fixed to both ends of the magnetic head carriage 400 are connected to the permanent magnets 503 and 504. Driven by a linear motor configured by arranging

When the members for driving the magnetic head carriage 400 are integrally provided on the mounting plate 500, the positional relationship between the guide shaft and the magnets of the linear motor is fixed, and each member is directly fixed to the cartridge holder. Workability during assembly is improved.

In the magnetic head carriage 400, a bearing (not shown) that comes into contact with one guide shaft 501 from the outside is provided, and a bearing 412 having a V-shaped groove that comes into contact with the other guide shaft 502 from the outside. Is provided. The bearing 412 is supported by a bearing mounting plate 414 rotatably attached to the magnetic head carriage 400 via a shaft 413, and the bearing mounting plate 414 presses the bearing 412 against the guide shaft 502. It is biased inward by the preload spring 415. Due to this biasing force, the magnetic head carriage 400 is supported against the guide shafts 501 and 502 without rattling.

The magnetic head 420 provided inside the magnetic head carriage 400 is driven by the power of a motor 520 as a power source provided outside the magnetic head carriage 400, via a rotating plate 530 to produce a magneto-optical disk MOD. It is driven so as to move away from and approach.

As shown in FIG. 4, the rotating plate 530 is rotatably supported by bearings 540 and 541 formed by vertically raising a part of the mounting plate 500, and is supported by two gears 521 and 522. It is rotated by the data 520.

A switch plate 531 that rotates integrally with the rotating plate 530 is provided at one end of the rotating plate 530, and two mounting plates 500 that detect the rotating position of the rotating plate 530 are provided. Switches 532 and 533 are provided. Further, the bearing portion 540 is provided with a stopper 534 for restricting the rotation range of the rotating plate 530 via the switch plate 531.

6 and 7 are enlarged views around the magnetic head 420 of FIGS. 4 and 5, respectively.

The magnetic head carriage 400 has a frame body 440 provided inside the support members 430 and 431 that support the coils 410 and 411, and the magnetic head 420 and the magnetic head 420 are provided in the space between the arches 441 and 442 in the longitudinal direction. A mechanism for supporting and driving the is provided.

A rotating shaft 450 is installed between the arches 441 and 442 of the frame 440, and a head rotating plate 460 is swingably provided on the rotating shaft 450 with respect to the frame 440. The head rotating plate 460 has a bearing 461 that makes rolling contact with the rotating plate 530 at one end, and bifurcated forks 463 and 464 are formed at the other end.

A coil spring 462 is arranged around the rotating shaft 450. The torsion spring 462 has one end locked in a locking hole 443 provided in the arch 442 and the other end locked in the upper end surface of the head rotation plate 460 in FIG. The plate 460 is constantly urged in the direction of arrow B in FIG. 6, that is, in the direction in which the bearing 461 is pressed against the rotating plate 530. This makes it possible to rotate the head rotating plate 460 in conjunction with the rotation of the rotating plate 530 regardless of the position of the magnetic head carriage 400.

The detailed shape of the head rotating plate 460 is shown in FIG. 8 (a) plan view, (b) sectional view, and (c) front view.

A rotating shaft 465 is fixed between the forks 463 and 464 of the head rotating plate 460, and a head rotating body 470 is rotatably attached via the rotating shaft 465. The head rotating body 470 includes bearing portions 471 and 472 provided at both ends of the rotating shaft 465 so as to be separated from each other in the axial direction, and a plate-shaped portion 473 connecting the bearing portions. The detailed shape of the head rotating body 470 is shown in FIG. 9 (a) plan view, (b) cross-sectional view, and (c) front view.

The plate-shaped portion 473 of the head rotating body 470 has a stopper plate 480 fixed to one surface thereof, and a fixing plate 481 fixing a plate spring 421 connected to the magnetic head 420 to the other surface thereof. There is.

Around the rotation shaft 465, a torsion spring 474 for urging the head rotating body 470 against the head rotating plate 460 in the arrow C direction in FIG. 6 is provided. Rotation is restricted by the contact surfaces of the head rotating plate 460 formed on the tips of the forks 463, 464 contacting the stopper plate 480.

The magnetic head 420 is biased by the leaf spring 421 toward the magneto-optical disk MOD with a predetermined pressure. In this example, the leaf spring 421 is attached so that a load of 5 grams is applied to the tip of the head. Power is set.

By this urging force, the head is displaced to the position shown by the chain double-dashed line in the figure when there is no magneto-optical disk, but when the magneto-optical disk is arranged and is rotating, Due to the wind pressure caused by the rotation, it levitates slightly away from the disc and stands still at the position indicated by the solid line.

Next, the operation of retracting the head will be described with reference to FIGS. 10 and 11.

When the rotating plate 530 is rotated by being driven by the motor 520 from the state shown in FIG. 6, the members from the head rotating plate 460 to the magnetic head 420 are rotated by the biasing force of the torsion spring 462. Following this, the magnetic head 420 separates from the magneto-optical disk by rotating integrally.

When the magnetic head 420 moves to the state shown in FIG. 10, the tip of the stopper plate 480 comes into contact with the contact portion 444 provided between the arches 441 and 442 of the frame body 440. When the rotating plate 530 is further rotated here, the head rotating plate 460 also rotates together, but since the rotation of the head rotating body 470 is restricted by the contact of the stopper member 480, the torsion spring 474 is rotated. Against the urging force of the head rotating plate 460, the head rotating plate 460 starts to rotate in the direction of arrow C ′ in FIG.

FIG. 11 shows the final stored state, in which the magnetic head 420 is rotated with respect to the magneto-optical disk by rotating the head rotating plate 460 and the head rotating body 470 in the opposite directions from the state of FIG. It is displaced until it becomes horizontal.

As described above, by constructing the drive mechanism of the magnetic head as a link mechanism with the two rotary shafts 450 and 465, it is possible to secure a large stroke for moving the magnetic head and prevent attachment / detachment of the disk cartridge. While avoiding this, the drive mechanism can be stored in a small space when the magnetic head is retracted.

Further, by rotating the head rotating plate 460 by the rotating plate 530 via the bearing 461, the carriage can be operated at any position without providing a power source for driving the head in the magnetic head carriage 400. Even in this case, the magnetic head 420 can be immediately displaced between the retracted position and the recording position. Therefore, as compared with the case where the carriage is once moved to a predetermined position and then the magnetic head is displaced, the magnetic head can be displaced in a short time, and the time for replacing the cartridge is shortened.

In the embodiment, a soft landing method is adopted in which the magnetic head is moved close to and away from the disk while the disk is rotating, and the head is slightly floated above the disk by the wind pressure caused by the rotation. However, the magnetic head driving mechanism described above can also be applied to a contact start / stop type device that rotates / stops a disk while the magnetic head is in contact with a stationary disk.

It should be noted that the rewritable magneto-optical disk of the single-sided recording system does not currently conform to the standardized ISO standard. However, in the embodiment, the size of the cartridge is set to the ISO standard so that the information can be reproduced even on the standardized double-sided recording type magneto-optical disk.

However, since information cannot be recorded on the double-sided recording type disc, the magneto-optical disc drive device of the embodiment needs to determine whether the disc in the mounted cartridge is a recordable type or not. There is.

Therefore, in the apparatus of the embodiment, when the disc cartridge is mounted, the mark on the disc cartridge is read, or the information recorded in the predetermined area of the disc is read. The type and direction are determined, and the magnetic head is moved close to the magneto-optical disc to the recording position only when the single-sided recording type disc is properly mounted, and the double-sided recording type disc or single-sided recording type disc is moved. If is inserted with the front and back reversed, the magnetic head is not driven with the storage position maintained.

[0058]

[Effect of the device]

 As described above, according to the present invention, the cartridge holder provided with the magnetic head or the optical head can be accurately positioned with respect to the base portion provided with the other head. The positional relationship can always be kept constant, and stable recording operation can be guaranteed.

Moreover, since the position of the cartridge holder is accurately determined only when recording / reproducing on / from the magneto-optical disk, the holder moving mechanism can be made simple and compact.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a magneto-optical disk device according to an embodiment.

FIG. 2 is a side view of the entire apparatus of the embodiment when the disc cartridge is attached and detached.

FIG. 3 is a side view of the entire apparatus of the embodiment when the disc cartridge is already mounted.

FIG. 4 is a cross-sectional view of the device of the example, which is taken along line IV-IV in FIG.

FIG. 5 is a plan view of the apparatus of the embodiment.

6 is an enlarged side view of the head drive mechanism shown in FIG.

7 is an enlarged plan view of the head drive mechanism shown in FIG.

FIG. 8 is a three-view drawing of a head rotating plate.

FIG. 9 is a three-view drawing of a head rotating body.

FIG. 10 is a view showing a state in which the magnetic head is being stored.
It is a side view similar to.

FIG. 11 is a side view similar to FIG. 4, showing a state in which a magnetic head is housed.

[Explanation of symbols]

 MOD Magneto-optical disk 100 Base 109 Fixing hole 200 Cartridge holder 204 Lever shaft 300 Optical head carriage 400 Magnetic head carriage 420 Magnetic head

Claims (1)

[Scope of utility model registration request] 1. A cartridge in which a base portion and a disc cartridge for accommodating a magneto-optical disc are inserted, and which is provided so as to be relatively distant from and approachable to the base portion along the rotation axis direction of the magneto-optical disc. A holder; an optical head carriage that is provided on one of the base portion and the cartridge holder and slidably supports an optical head in the radial direction of the magneto-optical disk; and the other of the base portion and the cartridge holder. A magnetic head carriage for slidably supporting the magnetic head in the radial direction, and positioning means for fixing the positions of the two when the cartridge holder approaches the base. Disk device.