JP2001035118A - Magneto-optical disk cartridge and magneto-optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magneto-optical disk cartridge capable of reducing the effect of wobbling of a disk and making a magneto-optical disk device thin in thickness, and also to provide the magneto-optical disk device using the cartridge. SOLUTION: In this magneto-optical disk cartridge which stores a magneto- optical disk 12 freely rotatably and which is provided with an orifice for exposing the disk externally and with a shutter means 13A, 13B for opening/closing the orifice; the orifice consists of a nearly sector-shaped first orifice provided on the planar part of the cartridge body 1 that is parallel to the magneto-optical disk 12 and a second orifice provided on the circular-arc side face of the cartridge body 1 that orthogonally crosses the planar part; and the second orifice is formed in the manner continuous to the first orifice over the entire circular- arc.

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 cartridge containing a magneto-optical disk of a magnetic field modulation recording type, and a magneto-optical disk device using the same.

[0002]

2. Description of the Related Art There are two types of direct overwrite methods for a magneto-optical disk: an optical modulation method and a magnetic field modulation method. The light modulation method changes the direction of the magnetic field of a magnetic film by applying a laser beam that is turned on or off in response to a recording signal while applying a constant auxiliary magnetic field when recording information. It is. On the other hand, the magnetic field modulation method changes the direction of the magnetic field of the magnetic film by inverting the direction of the auxiliary magnetic field in response to a recording signal in a state where continuous light or pulsed light is applied.

[0003] The light modulation method enables extremely high-speed modulation, and is effective when constructing a magneto-optical disk system with a high transfer rate. On the other hand, the magnetic field modulation method
The pits can be formed stably and accurately without being affected by the skew of the disk, and are suitable for stabilizing the system and increasing the density.

[0004] Incidentally, in a conventional magneto-optical disk drive of the magnetic field modulation system, a configuration as shown in FIG. 7 and FIG. .

That is, a magneto-optical disk 33 is provided in the cartridge body 32 of the magneto-optical disk cartridge 30.
Is rotatably housed. An opening 37A for inserting the magnetic field modulation head 35 is provided on the upper surface of the cartridge main body 32.
An opening 37B for passing the laser light emitted from the optical pickup 36 is provided. Opening 37A,
The shutter 37A is opened and closed by shutters 34A and 34B. The shutters 34A and 34B move parallel to the direction in which the magneto-optical disk cartridge 30 is inserted.

A suspension 38 as an elastic holding means for elastically holding the magnetic field modulation head 35 has an opening 37.
A is arranged at right angles to the longitudinal direction of A. The suspension 38 and the optical pickup 36 are attached to a support portion 39, and the support portion 39 moves in a direction perpendicular to the shutter opening and closing direction, so that the magnetic field modulation head 35 and the optical pickup 36 move the diameter of the magneto-optical disk 33. Move in the direction. This type of magneto-optical disk device 31 can reduce the depth.

[0007]

However, in the magneto-optical disk drive 31 having the above-described structure, although the depth direction can be made compact, there are the following problems.

That is, in the magneto-optical disk drive 31 shown in FIG. 8, the longitudinal direction of the suspension 38 is orthogonal to the longitudinal direction of the opening 37A, and the suspension 38 is notwithstanding the narrow width of the opening 37A. Although it can be long,
Since the suspension 38 is inclined, there is a problem that the magnetic field modulation head 35 is liable to be affected by the runout of the magneto-optical disk 33 as described below.

Now, as shown in FIG.
8 is inclined at an angle θ ₁ with respect to the surface of the magneto-optical disk 33, the runout of the magneto-optical disk is ΔZ
In some cases, the head core 35 has ΔX = ΔZ × tan
Lateral displacement will occur by [(θ1 + θ2) / 2].
If it is left as it is, it becomes difficult for the head core 35 to accurately access the pits on the track. Therefore, it is necessary to make the length of the head core 35 sufficiently long to cover a wide range of pits.

However, when the length of the head core 35 is increased, the magnetomotive force per unit area of the head core 35 is weakened, and the magnetic field strength is reduced. Therefore, the drive current must be increased. Further, the inductance L of the head core 35 increases, the impedance Z at a high frequency increases, and the power consumption and the heat generation increase.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problem. The opening of the magneto-optical disk cartridge is made substantially fan-shaped, the opening is elongated in the longitudinal direction of the suspension, and the surface deflection of the magneto-optical disk is improved. It is an object of the present invention to provide a magneto-optical disk cartridge capable of reducing the influence of the above and making the magneto-optical disk device thinner, and a magneto-optical disk device using the same.

[0012]

In order to achieve the above object, according to the present invention, a magneto-optical disk is rotatably housed,
A magneto-optical disk cartridge, comprising: an opening for exposing the magneto-optical disk to the outside; and shutter means for opening and closing the opening, wherein the opening is parallel to the magneto-optical disk. A substantially fan-shaped first opening provided in a flat portion of the cartridge body, and a second opening provided in an arc-shaped side surface of the cartridge body orthogonal to the flat portion. The department is
In the first opening, over the entire arc, in a continuous manner,
It is characterized by being formed.

As described above, in the magneto-optical disk cartridge of the present invention, the first opening is provided in the upper surface of the cartridge main body so as to be substantially fan-shaped. Furthermore, in that aspect,
Following the first opening, a second opening is further largely opened in the thickness direction of the cartridge. As a result, the suspension can be inserted deeper than before in the form of being parallel to the longitudinal direction of the opening, and the angle of the arm that is elastically deformed can be laid down on the disk surface. Can be improved with respect to surface runout, and is less susceptible to surface runout. Further, since the height of the support portion can be reduced, the thickness of the magneto-optical disk device can be reduced.

According to an embodiment of the present invention, the shutter can be easily opened and closed by engaging a recess provided in the shutter with a projection provided at a position facing the device. As described above, the device can be made thin without being expensive and large.

[0015]

1 and 2 are external views showing a magneto-optical disk cartridge according to the present invention.
2 shows the case where the shutter is closed, and FIG. 2 shows the case where the shutter is open. A magneto-optical disk 12 is rotatably housed in a cartridge main body 11 of the magneto-optical disk cartridge 10. A shutter 13A is rotatably attached to the outside of the cartridge body 11. The shutter 13A is locked by a lock lever 14 engaging a lock hole 15 provided therein.

A shutter guide groove 19 is provided on the side surface of the cartridge body 11, and the shutter pawl 18 is
9, the shutter 13A guides the rotation of the shutter 13A, and the shutter 13A
From getting out of the way. Lock lever 1
4 is unlocked by an unlocking claw (described later) provided in the magneto-optical disk device by inserting it into the magneto-optical disk device (direction B in the figure), whereby the shutter 13A is unlocked, It becomes pivotable. When the shutter 13A becomes rotatable, the shutter 1
A shutter opening / closing protrusion (described later) provided on the magneto-optical disk device side engages with the concave portion 16 provided in 3A. This allows the shutter 13A to move in the direction A in the drawing.
Is rotated, the first openings 20A are all opened, and the magneto-optical disk 12 is exposed. The opening 20A has a substantially fan shape and is formed continuously to the arc-shaped side surface of the cartridge body.

FIG. 3 is a plan view showing the magneto-optical disk cartridge 10 and the magneto-optical disk device 21 according to the present invention. The magnetic field modulation head 22, which is the auxiliary magnetic field generation means, shown here, is inserted into the first opening 20A. 4 and 5 are cross-sectional views taken along the line AA of FIG.
The optical pickup 2 is also provided on the lower surface of the cartridge body 11.
A rectangular opening 20B is provided for irradiating the magneto-optical disk 12 with the laser light emitted from 3. The magnetic field modulation head 2 of the magneto-optical disk device 21
The center of 2 is arranged on the center line 12A of the magneto-optical disk 12, and is attached to the support portion 24 via a suspension 23 as elastic holding means having appropriate elasticity.

At the time of recording, the suspension 23
As shown in FIG. 5, the optical disk cartridge 10 is inserted into the opening 20A, and is evacuated to the position shown in FIG. Discharge takes place. Then, the suspension 23 is completely inserted into the magneto-optical disk cartridge 10 at this position.

The support 24 is provided with the optical pickup 2.
5 is attached. At the time of recording / reproducing, the support portion 24 moves in parallel with the center line 12A of the magneto-optical disk 12, whereby the magnetic field modulation head 22 and the optical pickup 25 move the center line 12A of the magneto-optical disk 12.
Move radially along.

The upper and lower openings 20 of the cartridge body 11
Reference numerals A and 20B denote the operation of inserting the magneto-optical disk cartridge 10, and the shutters 13A and 13B are opened and closed by moving the shutters 13A and 13B clockwise. The shutters 13A and 13B are integrally formed and move integrally with the spindle motor insertion hole 27 as a fulcrum.

As shown in FIG. 6, the shutter 13A
In the process of inserting the cartridge into the magneto-optical disk device, the shutter opening / closing projection 26 provided on the magneto-optical disk device engages with the concave portion 16 provided on the shutter 13A, and the cartridge is turned clockwise by the cartridge inserting operation. And all open at the cartridge insertion completed position.

When the shutters 13A and 13B are in the closed state, the lock lever 14 is operated by the shutters 13A and 13B.
3B engages with a lock hole 15 provided on the side surface of the disc 3B to prevent the shutter from rotating. However, the lock lever 14 is brought into contact with a lock release claw 28 provided in the disk device by the operation of inserting the shutter. And rotates counterclockwise to disengage the lock hole 15. Thus, the rotation of the shutters 13A and 13B becomes possible.

In this state, the magneto-optical cartridge 10
Is inserted, the projection 26 for opening and closing the shutter and the recess 16
And the shutters 13A and 13B rotate clockwise. When the insertion of the magneto-optical cartridge 10 is completed, the lock lever 14 returns to the same state as the lock position. When the cartridge is ejected, the operation is reversed.

Now, the first of the upper surface of the cartridge body 11 will be described.
Opening 20A is provided with the suspension 2 of the magnetic field modulation head.
In order to reduce the inclination of the suspension 3, the suspension 23 is formed in a substantially sector shape that is long in the longitudinal direction. In particular, in the present embodiment, the inclination of the suspension 23 is reduced by extending the first opening 20A in the longitudinal direction of the suspension 23 in the direction of inserting the magneto-optical disk cartridge 10 into the magneto-optical disk device 21. , Compared with the conventional suspension 38,
The height of the support portion 24 is also smaller than the height of the conventional support portion 39.
Can be lower. In the cartridge insertion / ejection position, the suspension 23 is connected to the first opening 20.
A. Therefore, the head core (not shown) of the magnetic field modulation head 22 can accurately follow the predetermined pit, and the allowable amount of surface deflection of the magneto-optical disk 12 increases correspondingly.

As described above, even if the amount of surface deflection that can be followed increases, it is not necessary to increase the area of the head core, so that an increase in power consumption and heat generation can be suppressed. Further, the elastic deformation portion of the suspension 23 can be made sufficiently long as compared with the conventional one, so that the spring constant is reduced and a stable contact pressure of the magnetic field modulation head 22 against the magneto-optical disk 12 is obtained. And the strength of the spring can be increased by increasing the thickness of the spring.

Further, since the opening and closing mechanism of the shutters 13A and 13B is constituted by a simple mechanism including a projection on the apparatus side and a groove provided on the shutter, the depth and thickness of the apparatus can be made small and thin. Can be.

[0027]

As described above, according to the present invention, the opening of the magneto-optical disk cartridge is made substantially fan-shaped, and it is made longer in the longitudinal direction of the suspension and also in the thickness direction. The cartridge is rotated in accordance with the cartridge insertion operation, and is opened and closed by the rotation operation. Accordingly, the suspension can be inserted deeply into the opening.

Therefore, according to the present invention, when the magnetic field modulation head attached to the tip of the suspension moves up and down, the amount of lateral displacement of the head becomes smaller than in the prior art. Is large, it is possible to accurately follow a predetermined pit without increasing the area of the head core. This can prevent an increase in power consumption and heat generation, and can reduce the thickness of the disk device because the shutter opening / closing mechanism is configured within the thickness of the magneto-optical disk cartridge.

Further, the height of the support portion of the suspension is reduced, so that the disk device can be similarly made thinner. Further, since the elastic deformation portion of the suspension becomes longer and the spring constant can be reduced, it is possible to increase the followability and increase the strength of the suspension.

[Brief description of the drawings]

FIG. 1 is a schematic view of a magneto-optical disk cartridge with a shutter closed in an embodiment of the present invention.

FIG. 2 is a schematic view of the magneto-optical disk cartridge when the shutter is open.

FIG. 3 is a plan view of the magneto-optical disk cartridge device.

FIG. 4 is a sectional view taken along line AA of FIG. 3, showing a recording state of the magneto-optical disk device.

5 is a sectional view taken along the line AA of FIG. 3, showing a retracted state of the suspension.

FIG. 6 is a plan view of the magneto-optical disk device, showing a state during the cartridge insertion operation.

FIG. 7 is a plan view showing a conventional example.

FIG. 8 is a sectional view taken along the line BB of FIG. 6;

FIG. 9 is a diagram for explaining the effect of surface deflection of the magneto-optical disk 33.

[Explanation of symbols]

 10, 30 Magneto-optical disk cartridge 11, 32 Cartridge main body 12, 33 Magneto-optical disk 13A, 13B, 34A, 34B Shutter 14 Lock lever 16 Shutter recess 22, 35 Magnetic field modulation head 20A, 20B, 37A, 37B Opening 21, 31 Magneto-optical disk drive 23, 38 Suspension 24, 39 Support 26 Projection for opening and closing shutter 28 Lock release claw

Claims (7)

[Claims] An opening for rotatably storing the magneto-optical disk and exposing the magneto-optical disk to the outside;
A magneto-optical disk cartridge comprising: a shutter means for opening and closing the opening; wherein the opening is a substantially fan-shaped first opening provided in a plane portion of the cartridge body and parallel to the magneto-optical disk. And a second opening provided on an arc-shaped side surface of the cartridge main body, which is orthogonal to the plane portion, and the second opening is formed in the first opening over the entire arc. A magneto-optical disk cartridge formed in a continuous form. 2. The magneto-optical disk cartridge according to claim 1, wherein the opening is formed on both upper and lower planes of the cartridge main body in parallel with the magneto-optical disk. 3. The cartridge according to claim 1, wherein the shutter means is a shutter that holds the cartridge body from both sides outside the cartridge body and is rotatably attached to the cartridge body. Magneto-optical disk cartridge. 4. The magneto-optical disk cartridge according to claim 3, wherein the shutter has a pivot axis for opening and closing coaxial with a hole into which a spindle motor for rotating the disk is inserted. . 5. The shutter has a concave portion which engages with a protrusion provided on the magneto-optical disk device, and the shutter and the concave portion are engaged when the magneto-optical disk cartridge is inserted into and removed from the magneto-optical disk device. 5. The magneto-optical disk cartridge according to claim 3, wherein the magneto-optical disk cartridge is configured to be opened and closed when combined. 6. The magneto-optical disk cartridge according to claim 1, wherein the magneto-optical disk cartridge is a magneto-optical disk of a magnetic field modulation system. 7. When recording / reproducing information by loading a magneto-optical disk cartridge of a magnetic field modulation recording system, a position between an insertion position of the magneto-optical disk and the recording / reproducing position is determined.
In the magneto-optical disk device for reciprocating the magneto-optical disk cartridge, the mounted magneto-optical disk cartridge accommodates the magneto-optical disk rotatably, and an opening for exposing the magneto-optical disk to the outside; A shutter means for opening and closing the opening, wherein the opening is a substantially fan-shaped first opening provided in a flat portion of the cartridge body and parallel to the magneto-optical disk; A second opening provided on an arc-shaped side surface of the cartridge main body, the second opening being formed in the first opening so as to be continuous over the entire arc thereof. The auxiliary magnetic field generating means inserted into the opening and the auxiliary magnetic field generating means are connected to the device side via supporting means so as to be integrally movable. An optical pickup unit for recording / reproducing information on an optical disk are provided, in the insertion position of the magneto-optical disk cartridge,
A magneto-optical disk drive, wherein the auxiliary magnetic field generating means and a support means for connecting the optical pickup means are inserted into the opening.