JPH10253U - Magneto-optical disk cartridge - Google Patents

Abstract

(57) [Problem] To provide a magneto-optical disk cartridge capable of recording information with excellent recording and reproduction characteristics and hardly deteriorating in reliability. SOLUTION: An integrated upper case 1a and lower case 1 are provided.
b) to accommodate the magneto-optical disk in the internal space. The lower case is provided with an optical head window 2b whose longitudinal direction is the radial direction of the magneto-optical disk and a spindle entry hole 4, and the upper case is provided with a magnetic head window 2a at a portion facing the optical head window.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a disk cartridge suitable for a magneto-optical disk.

[0002]

[Prior art]

 Disc-shaped recording media such as magneto-optical discs, optical discs, and magnetic discs are used to facilitate the handling of discs in disk drive units when attaching and detaching them, and to prevent dust and grease from adhering to the discs. Generally, they are stored in a disk cartridge.

[0003] Unlike other disks, a magneto-optical disk requires both an optical head and an external magnetic field device for recording information. In the conventional magneto-optical disk cartridge, an optical head window for allowing the optical head to enter the disk cartridge is opened in the upper case, and a magnetic case for allowing the external magnetic field device to enter the disk cartridge is provided in the lower case. The head window is open.

[0004]

[Problems to be solved by the invention]

 The conventional magneto-optical disk cartridge configured as described above is handled with the upper case in which the optical head window is opened facing upward when the disk cartridge is attached to or detached from the drive device. Foreign matter easily adheres, and the recording and reproduction failure of information due to the foreign matter easily occurs.

An object of the present invention is to provide a magneto-optical disk cartridge capable of solving the deficiencies of the prior art and hardly deteriorating recording / reproducing characteristics and recording information with excellent reliability.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a single-sided recording type magneto-optical disk in an internal space defined by an integrated upper case and lower case, and the lower case has a spindle entry hole and the entrance. An optical head window passing through the center of the hole and having a longitudinal direction in the radial direction of the magneto-optical disk is opened, and a magnetic head window is opened in a portion of the upper case facing the optical head window. did.

As described above, the magneto-optical disk cartridge is handled with the upper case facing upward when the cartridge is attached to or detached from the drive device. Therefore, when the optical head window is opened in the lower case, the optical head is moved to the upper case. The amount of dust and the like attached to the light incident surface of the magneto-optical disk can be reduced as compared with the case where the window is opened. Therefore, it is possible to reduce information recording / reproduction failure due to the attachment of dust and the like, and it is possible to enhance the reliability of information recording.

In this configuration, dust and the like tend to adhere to the surface opposite to the light incident surface, but even if dust and the like adhere to this surface, the magnetic field applied to the magneto-optical disk Since the strength hardly decreases and the recording / reproducing characteristics do not deteriorate, there is no practical problem.

[0009]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of a disc cartridge according to the present invention as viewed from the upper case side, and FIG. 2 is a perspective view of the same from the lower case side, wherein 1a is an upper case, 1b is a lower case, 2a is a magnetic head window, 2b is an optical head window, 3 is a shutter, 4 is a spindle entrance hole, 5 is a guide groove, 6a and 6b are recesses, 7a and 7b are notches, and 8 is a notch.

In FIG. 1 and FIG. 2, an upper case 1a and a lower case 1b are integrated, and a disk (not shown) is accommodated in the internal space without restraint. The upper case 1a and the lower case 1b are provided with depressions 6a and 6b for regulating the stroke of the shutter 3, respectively. The recess 6a is provided with a magnetic head window 2a, and the recess 6b is provided with a spindle entry hole 4 at the center of the optical head window 2b and the lower case 1b for entering the spindle. ing. As is apparent from FIG. 2, the width of the optical head window 2b and the diameter of the spindle entrance hole 4 are formed to be substantially the same size. The shutter 3 has a substantially U-shaped cross section, and is mounted slidably in the direction of arrow A and in the opposite direction so that the disc cartridge is sandwiched between the recesses 6a and 6b. The portion of the shutter 3 attached to the lower case 1b is formed to have a length capable of closing the optical head window 2b and the spindle entry hole 4, and the portion attached to the upper case 1a is formed of the magnetic head window 2a. Formed to a length that can be closed. Therefore, the portion of the shutter 3 attached to the lower case 1b is formed longer than the portion attached to the upper case 1a.

The head windows 2a and 2b are provided symmetrically with a straight line B passing through the center of the spindle entry hole 4 and perpendicular to the side of the lower case 1b to which the shutter 3 is attached, and have respective lengths in the depth direction ( The length in the direction perpendicular to the arrow A) is set so as to straddle the entire recording area of the stored disk (not shown). The recess 6a of the upper case 1a has a depth that includes the magnetic head window 2a, but the recess 8b of the lower case 1b is sufficiently long in the depth direction to include the spindle entry hole 4. .

In the upper case 1a, between the magnetic head window 2a and the side of the upper case 1a to which the shutter 3 is attached, the recess 6a is formed so as to prevent the head from hitting when the disk drive is attached or detached. The lower case 1b is similarly provided with a notch 7a having a step with respect to the concave portion 6b between the optical head window 2b and the side of the lower case 1b to which the shutter 3 is attached. A portion 7b is provided.

In such a configuration, the width of the head window 2b of the lower case 1b is smaller than that of the head window 2a of the upper case 1a. In the upper case 1a, the head window 2a is wide, and the head window 2a is positioned at the end of the concave portion 6a such that one side thereof substantially coincides with one side of the concave portion 6a. In other words, one side of the concave portion 6a is set to almost coincide with one side of the head window 2a.

The width of the shutter 3 is slightly wider than the width of the head window 2a, and the shutter 3 is transported in the first position where the head window 2a is completely opened and in the direction of arrow A as shown in the figure. And the second position at which the head window 2a is completely closed, but the stroke of the shutter 3 can be minimized by positioning the head window 2a with respect to the recess 6a as described above.

On the other hand, on the lower case 1b side, the head window 2b is narrower than the window 2a of the upper case 1a and is provided symmetrically with respect to the same straight line B as the window 2a. 2 are opposed to each other at the same width as the portion sliding on the recessed portion 6a. Therefore, as shown in FIG. 2, the recessed portion 6b exists on both sides in the width direction of the head window 2b. Become.

Therefore, when the shutter 3 is moved in the direction of arrow A from the position shown in FIG. 1 and set to the second position where the head window 2a is completely closed, the lower case 1b shown in FIG. The shutter 3 comes into contact with the side of the recess 6b to completely close the head window 2b and the hub hole 4, but at this time, the shutter 3 is supported by the recesses 6b on both sides in the width direction of the head window 2b. Become.

The guide groove 5 of the shutter 3 is provided in a recessed portion 6b provided with a narrow head window 2b in parallel with the arrow A. In this way, the guide grooves 5 can be provided on both sides of the cutout 7b. FIG. 3 shows the guide groove 5 of the shutter 3 provided in the recess 6b of the lower case 1b.

As shown in FIG. 4, a claw 3 a is provided on the inner surface of the shutter 3 on the side of the recess 6 b, which is slidably engaged with the guide groove 5 of the recess 6 b shown in FIGS. It matches. At least two claws 3a are provided, one of which is provided at the right end of the shutter 3 with reference to FIG. For this reason, when the shutter 3 is moved in the direction of arrow A to close the head window 2b, the claw 3a at the right end (FIG. 4) is provided in the guide groove provided in the recess 6b on the right side of the cutout 7b. 5 is engaged. In this state, the other at least one claw 3a is engaged with the guide groove 5 provided in the recess 6b on the left side of the notch 7b. As described above, the pawls 3a provided on the shutter 3 on both sides of the notch 7b engage with the guide grooves 5, so that the shutter 3 is held in a stable state without rattling, and the mechanical strength increases. Will be.

In FIGS. 1 and 2, the shutter 3 is added in the direction of arrow A by a spring member (not shown), so that the head windows 2 a and 2 b and the hub hole 4 are normally closed by the shutter 3. . When such a disc cartridge is mounted on the disc drive device, a lever (not shown) engages with the notch 8 in the process, and by the action of this lever, the shutter 3 opposes the arrow A against the urging force of the spring member. Transported in the direction. As a result, the head windows 2a and 2b and the hub hole 4 are opened, the magnetic head from the head window 2a, the optical head from the head window 2b, and the spindle from the hub hole 4 enter the disk cartridge. The stored magneto-optical disk (not shown) is driven.

As described above, in this embodiment, since the optical head window 2b is opened in the lower case 1b, the light incident surface of the magneto-optical disk is compared with the case where the optical head window is opened in the upper case 1a. It is possible to reduce the amount of dust and the like adhering to the surface, and to reduce the information recording / reproduction failure caused by the adhesion of the dust and the like, thereby improving the reliability of information recording.

Further, since notches 7a and 7b are provided with predetermined steps between the ends of the head windows 2a and 2b facing the sides of the case and the sides, the inside of the magneto-optical disk drive is provided. When a magneto-optical disk cartridge is inserted into the optical disk, the disk cartridge is less likely to collide with the optical head and the magnetic head, which are arranged at a small distance from each other, preventing damage to the optical head, the magnetic head, and the disk cartridge. it can.

Further, since the shutter 3 opens and closes the spindle entry hole 4, the magnetic head window 2 a and the optical head window 2 b simultaneously, the shutter 3 can completely close the opening of the disk cartridge, and The opportunity for dust and grease to adhere to the disk can be significantly limited, and the useful life of the magneto-optical disk can be extended.

In the above embodiment, the width of the optical head window of the lower case is wide, but one of the head windows of the upper case and the lower case may be narrow, which is equivalent to the configuration of the disk drive device. May be set in accordance with.

[0025]

[Effect of the invention]

 As described above, according to the present invention, since the optical head window is opened in the lower case, dust and the like on the light incident surface of the magneto-optical disk are compared with the case where the optical head window is opened in the upper case. Therefore, the reliability of information recording can be improved because the amount of adhesion of dust and the like can be reduced, and defective recording and reproduction of information due to the adhesion of dust and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a disk cartridge according to the present invention as viewed from an upper case side.

FIG. 2 is a perspective view of the disk cartridge according to the embodiment of the present invention as viewed from a lower case side.

FIG. 3 is a partial perspective view showing a guide groove of a shutter provided in a lower case.

FIG. 4 is a partially enlarged perspective view of a shutter.

[Explanation of symbols]

 1a Upper case 1b Lower case 2a Magnetic head window 2b Optical head window 3 Shutter 5 Guide groove 6a, 6b Depressed portion 7a, 7b Notch 8 Notch

Claims (1)

[Utility model registration claims] 1. A single-sided recording type magneto-optical disk is housed in an internal space defined by an integrated upper case and lower case, and the lower case passes through a spindle entrance hole and a center of the entrance hole. An optical head window whose longitudinal direction is the radial direction of the optical disk, and a magnetic head window is opened in a portion of the upper case facing the optical head window.