JPH081693U - Optical disc cartridge - Google Patents

Abstract

(57) Abstract: A disk cartridge suitable for a small-sized single-sided recording type magneto-optical disk is provided. SOLUTION: An integrated upper case 1a and lower case 1
The disc-shaped recording medium is housed in the internal space defined by b.
The lower case is provided with an optical head window 2b whose longitudinal direction is the radial direction of the disk-shaped recording medium and a spindle entry hole 4 having the same diameter as the width of the optical head window, and the upper case is provided with the optical head window. A magnetic head window 2a is provided in a portion facing the. Notches 7a, 7b with a predetermined step between the end of each head window facing the side of each case and the side.
To provide. A shutter 3 is provided on the side of each of the cases having the cutout portion so as to slide in parallel with the case and simultaneously open and close the spindle entry hole, the magnetic head window, and the optical head window.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as a magneto-optical disk cartridge, there is known a relatively large-sized one that can perform double-sided recording by mounting the disk drive device upside down.

On the other hand, in recent years, a small-sized single-sided recording type magneto-optical disc has been put into practical use, and a disc cartridge suitable for such a magneto-optical disc has been studied.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a disc cartridge suitable for a compact and single-sided recording type magneto-optical disc.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention accommodates a disc-shaped recording medium in an internal space formed by an upper case and a lower case that are integrated, and passes through the spindle entrance hole and the center of the entrance hole in the lower case. An optical head window having a longitudinal direction in the radial direction of the disk-shaped recording medium is provided, and a magnetic head window is provided in a portion of the upper case facing the optical head window, and the head window is provided with a magnetic head window. A notch is provided with a predetermined step between the end facing the side of each case and the side, and the side of each case having the notch is slid in parallel with the side so that the spindle entry hole is formed. And a shutter for simultaneously opening and closing the magnetic head window and the optical head window.

The width of the optical head window reduces the width of the shutter to maintain the smooth operation of the shutter, and the stroke for opening and closing the shutter reduces the design of the disk drive device, especially the opening and closing of the shutter. In order to facilitate the design of the mechanism, it is preferable to make the size approximately equal to the diameter of the spindle entry hole. In addition, the width of the optical head window and the width of the magnetic head window can be the same or different. Further, it is preferable that the optical head window and the spindle entry hole are formed separately from each other. Furthermore, it is preferable that the shutter is an integral type with a U-shaped cross section, and the lower case side that closes the optical head window and the spindle entry hole is longer and the upper case side that closes the magnetic head window is shorter than this. To do.

According to the above configuration, since the large and heavy optical head can be arranged below the disk cartridge, the vibration of the optical head can be suppressed by the relatively small and low-rigidity head holding mechanism. Therefore, it is possible to reduce the size and weight of the drive device, suppress vibration of the optical head, and improve the dynamic characteristics of the optical head.

Further, if a notch is provided with a predetermined step between the end of each head window facing the side of the case and the side, a magneto-optical disk cartridge is installed in the magneto-optical disk drive device. At the time of insertion, the disc cartridge is less likely to collide with the optical head and the magnetic head which are arranged to face each other with a small gap therebetween, so that destruction of the optical head, the magnetic head and the disc cartridge can be prevented.

Further, when the spindle entrance hole, the magnetic head window, and the optical head window are simultaneously opened and closed by the shutter, the opening of the disc cartridge can be completely closed by the shutter, so that dust and hand grease on the magneto-optical disc. It is possible to remarkably limit the chances of adhesion and to extend the service life of the magneto-optical disk.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of a disk cartridge according to the present invention as seen from the upper case side, and FIG. 2 is a perspective view as seen from the lower case side. 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 entry hole, 5 is a guide groove, 6a and 6b are recesses, 7a and 7b are notches, 8 is notches, and 9a and 9b. Is an inclined surface.

In FIGS. 1 and 2, the upper case 1a and the lower case 1b are integrated, and a disc (not shown) is housed in the inner space of the upper case 1a without being restrained. The upper case 1a and the lower case 1b are provided with recesses 6a and 6b for restricting the stroke of the shutter 3, respectively. The recessed portion 6a is provided with a magnetic head window 2a, and the recessed portion 6b is provided with a spindle entry hole 4 for entering the spindle at the center of the optical head window 2b and the lower case 1b. . 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 have 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 by the recesses 6a and 6b. The portion attached to the lower case 1b of the shutter 3 is formed to have a length that can close the optical head window 2b and the spindle entry hole 4, and the portion attached to the upper case 1a is the magnetic head window 2a. Is formed to a length that can be closed. Therefore, the portion attached to the lower case 1b of the shutter 3 is formed longer than the portion attached to the upper case 1a.

The head windows 2a and 2b are provided symmetrically with respect to a straight line B which passes through the center of the spindle entrance hole 4 and is perpendicular to the side of the lower case 1b to which the shutter 3 is attached. The length (the length in the direction perpendicular to the arrow A) is set so as to straddle the entire recording area of the housed disc (not shown). The recessed portion 6a of the upper case 1a has a depth length that includes the magnetic head window 2a, while the recessed portion 8b of the lower case 1b includes the spindle entry hole 4 and is sufficiently long toward the back. ing.

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 head 6 does not hit the recessed portion 6a when attaching / detaching in / from the disk drive device. In the lower case 1b as well, a notch 7a having a step is formed between the optical head window 2b and the side of the lower case 1b to which the shutter 3 is attached. A part 7b is provided. The left front corners of the upper case 1a and the lower case 1b, that is, the upper case 1a and the lower case 1b are integrated with each other, with the sides of the upper case 1a and the lower case 1b facing forward. When viewed from the direction, inclined surfaces 9a and 9b for preventing erroneous insertion are formed at the left front corners of the upper case 1a and the lower case 1b.

In this structure, the width of the head window 2b of the lower case 1b is wider than that of the head window 2a of the upper case 1a. In the lower case 1b, the head window 2b is wide, and the head window 2b is positioned at the end of the recessed portion 6b so that one side thereof almost coincides with one side of the recessed portion 6b. In other words, one side of the recess 6b is set so as to almost coincide with one side of the head window 2b.

The width of the shutter 3 is slightly wider than the width of the head window 2b, and the shutter 3 is transferred in the direction of arrow A and the first position where the head window 2b is completely opened as shown in the drawing. The second position is to completely close the head window 2b, and the stroke of the shutter 3 can be minimized by positioning the head window 2b with respect to the recess 6b as described above.

On the other hand, on the side of the upper case 1a, the head window 2a is narrower than the window 2b of the lower case 1b, and the head window 2a is provided symmetrically with respect to the same straight line B as the window 2b, and the recess 6a of the shutter 3 is provided. Since the portions that slide along the recesses 6b face each other with the same width as the portions that slide along the recesses 6b, as shown in FIG. 2, the recesses 6a are present on both sides of the head window 2a in the width direction. 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 shutter is closed on the upper case side shown in FIG. 3 contacts the side of the recess 6a and completely closes the head window 2a and the hub hole 4. At this time, the shutter 3 is also supported by the recesses 6a on both sides in the width direction of the head window 2a. .

Further, the guide groove 5 of the shutter 3 is provided in parallel with the arrow A in the recessed portion 6a in which the narrow head window 2a is provided. By doing so, the guide grooves 5 can be provided on both sides of the cutout portion 7a. FIG. 3 shows the guide groove 5 of the shutter 3 provided in the recess 6a of the upper case 1a.

Further, as shown in FIG. 4, a claw 3a is provided on the inner surface of the shutter 3 on the side of the recess 6a, which is slidably engaged with the guide groove 5 of the recess 6a shown in FIGS. It is in agreement. At least two claws 3a are provided, one of which is provided at the right end portion of the shutter 3 with reference to FIG. Therefore, when the shutter 3 is transported in the direction of arrow A and the head window 2a is closed, the claw 3a (FIG. 4) at the right end portion is formed in the guide groove provided in the recess 6a on the right side of the cutout portion 7a. 5 is engaged. In this state, the other at least one claw 3a is engaged with the guide groove 5 provided in the recess 6a on the left side of the cutout 7a. In this way, the claws 3a provided on the shutter 3 on both sides of the notch 7a engage the guide groove 5, so that the slide 3 is held in a stable state without rattling, and the mechanical strength is improved. Will increase.

In FIGS. 1 and 2, the shutter 3 is attached 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 disk cartridge is attached to the disk drive device, a lever (not shown) engages with the notch 8 in the process, and the shutter 3 resists the biasing force of the spring member by the action of this lever and is opposite to the arrow A. Is transferred in the direction. As a result, the head windows 2a and 2b and the hub hole 4 are opened.

As described above, in this embodiment, since the spindle entrance hole 4 has the same diameter as the width of the optical head window 2b, the width of the shutter can be reduced and the smooth operation of the shutter 3 can be improved. Can be maintained at Further, since the stroke for opening / closing the shutter 3 can be made small, the design of the disk drive device, particularly the design of the shutter opening / closing mechanism can be facilitated.

Further, since the notches 7a and 7b are provided with a predetermined step between the ends of the head windows 2a and 2b facing the sides of the case and the sides, the magneto-optical disk drive apparatus When inserting a magneto-optical disc cartridge into the optical disc, the disc cartridge is less likely to collide with the optical head and magnetic head that are arranged opposite to each other with a small gap, preventing damage to the optical head, the magnetic head, and the disc cartridge. it can.

Further, since the spindle 3 is opened and closed by the shutter 3 at the same time as the magnetic head window 2a and the optical head window 2b, the opening of the disk cartridge can be completely closed by the shutter 3 and the magneto-optical disk. It is possible to significantly limit the chances of dust and hand grease adhering to the surface, and to extend the service life of the magneto-optical disk.

In the above embodiment, the optical head window of the lower case is made wide, but it is only necessary to make either the upper case or the lower case head window narrower. It may be set according to.

[0026]

As described above, according to the present invention, since a large and heavy optical head can be arranged below the disk cartridge, a relatively small and low-rigidity head holding mechanism is provided. Since the vibration of the optical head can be suppressed, the size and weight of the drive device can be reduced, and the vibration of the optical head can be suppressed and the dynamic characteristics of the optical head can be improved. Therefore, the disk cartridge suitable for a small-sized and single-sided recording type magneto-optical disk can be obtained.

Further, since the notch portion is provided with a predetermined step between the end of each head window facing the side of the case and the side, the magneto-optical disk cartridge is installed in the magneto-optical disk drive device. At the time of insertion, the disk cartridge is less likely to collide with the optical head and the magnetic head which are arranged opposite to each other with a small gap therebetween, and the optical head, the magnetic head and the disk cartridge can be prevented from being destroyed.

Furthermore, since the spindle entrance hole, the magnetic head window, and the optical head window are simultaneously opened and closed by the shutter, the opening of the disc cartridge can be completely closed by the shutter, and dust and hand grease on the magneto-optical disc. Since the chances of adhesion to the can be significantly limited, the service life of the magneto-optical disk can be extended.

[Brief description of drawings]

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

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

3 is a diagram showing a guide groove of a shutter provided in the lower case of FIG.

FIG. 4 is a partially enlarged perspective view of the shutter in FIGS. 1 and 2.

[Explanation of symbols]

 1a Upper case 1b Lower case 2a Magnetic head window 2b Optical head window 3 Shutter 5 Guide groove 6a, 6b Recessed portion 7a, 7b Cutout portion 8 Cutout portion 9a, 9b Inclined surface

Claims (5)

[Scope of utility model registration request] 1. A disk-shaped recording medium is housed in an internal space formed by an upper case and a lower case which are integrated with each other, and a spindle entrance hole and a center of the entrance hole are passed through the lower case in a radial direction of the disk-shaped recording medium. Is provided in the longitudinal direction, and a magnetic head window is provided in a portion of the upper case that faces the optical head window, and an end portion of each head window that faces a side of each case. A notch is provided at a predetermined step between the side and each side of the case having the notch and slides parallel to the side so that the spindle entrance hole, the magnetic head window and the optical head window are simultaneously formed. An optical disk cartridge comprising a shutter that opens and closes. 2. The optical disk cartridge according to claim 1, wherein the width of the optical head window is substantially equal to the diameter of the spindle entrance hole. 3. The optical disk cartridge according to claim 1, wherein the optical head window and the spindle entrance hole are formed separately from each other. 4. The disk cartridge according to claim 1, wherein the shutter has a substantially U-shaped cross section, and a portion attached to the lower case is longer than a portion attached to the upper case. And a portion attached to the lower case closes the optical head window and the spindle entrance hole, and a portion attached to the upper case closes the magnetic head window. Optical disk cartridge. 5. The optical disk cartridge according to claim 1, wherein a width of the optical head window and a width of the magnetic head window are different from each other.