JPS62236189A - Disk cartridge - Google Patents

Abstract

PURPOSE:To insure the hole blocking plate part of a shutter against being butted and caught on one end surface of an opening part when said plate part is closed by setting the flat shape of the opening part in a trapezoidal shape so that it can be wider toward a turntable insertion hole and making at least one end surface into a tapered surface with the prescribed gradient angle. CONSTITUTION:The opening part 7 is opened so that one end 71 of the insertion hole 72 positioned at the side of the outer periphery of the disk 3 can be wider than the other end 72 of said hole. Especially the end edge 73 of the opening part 7 tilts to the right from the end 71 toward the end 72, and a wall thickness part becoming the peripheral wall surface of the insertion hole at the edge 73 is made into such a tapered surface that the side of the end 71 can be approximately perpendicular, and its gradient angle gradually becomes greater toward the other end 72. Even if the blocking plate part 29a of the shutter 29 butts the end 73 of the opening part 7 while the blocking plate part 29a of the shutter 29 is just blocking, said part 29a will not get caught, and shifts to the state where it is completely closed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that stores a disk such as an optical disk or a magneto-optical disk within a case.

[Summary of the invention]

In this invention, the planar shape of the opening for the pink amplifier that is opened and closed by the shutter is formed into a trapezoidal shape that gradually becomes wider toward the turntable insertion hole, and at least one side edge of the hole, that is, the shack is closed. By making one side end face located at the forward side in the moving direction a tapered face having a predetermined inclination angle, engagement between the shutter and the opening can be avoided.

[Conventional technology]

As shown in FIGS. 3 and 4, a disk cartridge 1 such as a conventional optical disk cartridge has a disk 3 rotatably housed in a case 2 made of synthetic resin or the like. And on both upper and lower surfaces 4.5 of the case 2,
A rectangular recess 8 is formed on one side of the case 2, facing the edge 2a, and the recess 8 has a turntable insertion hole 6 and an opening 7 through which a big amplifier faces.

Note that the recess 8, the turntable insertion hole 6, and the opening 7 are vertically symmetrically provided on both upper and lower surfaces 4.5 of the case 2.

Further, a substantially U-shaped shack 9 is slidably attached to the case 2 so as to straddle the pair of upper and lower recesses 8 and one side edge 2a of the case 2.

When the disc cartridge 1 is not in use, the pair of upper and lower closing plates 9a of the shutter 9 closes the turntable insertion hole 6 and the opening 7 to prevent dust from entering into the case 2. There is.

The shutter 9 is formed of a stainless steel plate or the like into a substantially U-shape, and includes a pair of upper and lower closing plate portions 9a and a continuous plate portion 9C connecting the pair of closing plate portions 9a. The shank 9 is slidably attached to the case 2 by screwing the continuous plate portion 9C to a sliding member 12 arranged on one side edge 2a of the case 2.

Further, each end portion 9b of these hole closing plate portions 9a is inserted into a guide slit 1-11 that is continuous with the recessed portion 8, as shown clearly in FIG. The guide slit 11 is formed on the lower side of the slit forming member 10 by attaching the slit forming member 10, which is molded separately from the case 2, to the case 2 at one side edge of the recess 8. .

When the disk cartridge 1 is not in use, the shutter 9 is slid in the direction of the arrow a in FIG. The plate portion 9a closes the turntable insertion hole 6 and the opening 7 formed on the upper and lower surfaces 4.5 of the case 2, respectively. In addition, when in use, the shutter 9 is slid in the opposite direction of arrow a by the interlocking mechanism inside the case 2, so the turntable (not shown) and the optical big amplifier (not shown) of the disc player are inserted into the turntable insertion holes. 6 and the opening 7 to write and/or read information signals.

[Problem that the invention seeks to solve]

However, in the conventional disk cartridge, as shown in FIG. 4, during use or storage, the pair of upper and lower closing plates 9a of the shaft 9 bends under its own weight and moves from the open, prone position to the closing direction. In some cases, the shutter 9 may hit the end face of the opening 7 and get caught, causing the shutter to close completely.This is especially true for discs that have large diameter optical discs (300 mm in diameter) stored in the case. In a cartridge, as the case 2 becomes considerably larger, the shutter 9 also becomes considerably larger, and the length and width of the shutter 9 are approximately 2301 mm and 83 mm, for example, and are exposed to the outside of the cartridge, so the above-mentioned flexure is reduced. Note that if the closing plate 9a of the shutter 9 bends and hits the hole-side end surface 7a of the opening 7 located ahead in the shutter closing direction, and the shutter 9 does not close completely, the Dirt, dust, etc. enter the case 2 through the turntable insertion hole 6 and the opening 7 from the gap.
The particles enter the inside of the disk and adhere to the disk 3, causing damage to the information signal and/or poor reading. Also shutter 9
If the closing plate portion 9a of the shank 9 is bent, the end portion 9 of the shank 9
b is the guide slit 1 on the lower side of the slit forming member 10
There is also the inconvenience that the value deviates from 1. moreover,
The deflection of the hole closing plate portion 9a of the shutter 9 deteriorates the appearance of the disk cartridge and reduces its commercial value. In order to eliminate this drawback, the plate thickness of the shutter 9 may be increased to reduce the deflection, but this is not preferable from the viewpoint of workability or weight.

[Means for solving problems]

In the present invention, a disk is housed in a case, and at least one side thereof has an opening facing the big amplifier, and a shutter having a closing plate portion for closing the opening is slidably attached. A disc cartridge characterized in that the opening has a trapezoidal planar shape that is widened toward the turntable insertion hole, and at least one end face is a tapered surface having a predetermined inclination angle. This is related to.

[Effect]

Since the disc cartridge according to the present invention has the above-described configuration, when the hole closing plate portion of the shutter for closing the pickup opening hits the end surface of one side of the opening of the disc cartridge, There's no way you can't get caught up in it.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an optical disk cartridge will be described based on the drawings.

The disk cartridges shown in the following examples are substantially the same as the conventional optical disk cartridges shown in FIGS. 3 and 4, except that the structure of the opening facing the optical pickup has been changed. Since it is a different structure, the same members will be described with the same reference.

As shown in FIG. 1, the case 20 consists of an upper half 21 and a lower half 22 made of synthetic resin or the like, which are integrally connected to each other by screws or the like. In each of the upper half 21 and the lower half 22, a substantially rectangular recess 8 with a depth of about 1-1 is formed so as to face one side edge of these halves, and a turntable insertion hole 6 is formed in the recess 8. and an opening 7 from which an optical pickup 7 faces. Note that the recessed portion 8. Turntable insertion hole 6
The openings 7 are vertically symmetrically provided on both upper and lower surfaces 4.5 of the case 20. Further, a substantially U-shaped shutter 29 is attached to the case 20 by screwing its connecting plate portion 29c to the sliding member 12 so as to straddle the pair of upper and lower recesses 8 and one side edge 20a of the case 20. It is being

The opening 7 has a trapezoidal planar shape, that is, the other end 7 of the insertion hole is located closer to the center of the disk 3 than the width of one end 71 of the insertion hole located on the outer peripheral side of the disk 3.
Particularly, when the shutter 29 of the opening 7 moves to close, one side edge 73 located at the front in the direction of movement of the shack faces from the one end 71 side to the other end 72. It is inclined to the right in FIGS. 1 and 2.

In addition, the thick portion of the - side edge 73 that becomes the peripheral wall surface of the insertion hole, that is, the - side end surface 73a, is close to vertical on the one end 71 side, and gradually increases in angle of inclination toward the other end 72 side. It has a tapered surface that looks like this.

The shutter 29 is made of a stainless steel plate with a thickness of about 0.3 sm and is formed into a substantially U-shape, and has a closing plate portion 29a that closes the turntable insertion hole 6 and the opening 7.

Further, the image leading edge 29b of the shank 29 is inclined inward, and the image leading edge 29b is inserted into the guide slit 25 formed between the slit forming part 30 and the downwardly inclined surface 24 below the slit forming part 30. This allows the shank 29 to be guided.

By the way, one side edge 73 and negative end surface 73 of the opening 7
As shown in the shape of a, by having an inclined and tapered surface, even if the closing plate part 29a of the shutter 29 sag inward due to its own weight or is warped inward by external pressure. The closing plate portion 29a can be closed following the slope and tapered surface.

In particular, the portion of the shutter 29 near the continuous plate portion 29c has a bent portion and is highly rigid, and the tip of the shank 29, that is, the free end side, has a structure that is easy to swing. The free end side of the plate portion 29c is formed to have a large slope.

Since the opening 7 is formed as described above, even if the closing plate 29a of the shutter 29 hits an example end surface of the opening 7 during closing, this one end surface side is located at the center of the disk cartridge. Since the end face itself is tapered, the closing plate portion 29a can be moved to a completely closed state without getting caught.

Note that this invention is widely applicable not only to optical disk cartridges that house an optical disk in a case, but also to other disk cartridges that house magnetic disks, magneto-optical disks, etc. It is applicable not only to disc cartridges that use both the upper and lower surfaces of the disc, but also to disc cartridges that use only one of the upper and lower surfaces.

〔Effect of the invention〕

According to this invention, the closing plate part of the shutter does not get caught on the end face of the opening facing the pickup and the shutter cannot be completely closed, so it is possible to prevent dirt, dust, etc. from entering. Therefore, errors in writing and/or reading information to the disk can be effectively prevented.

[Brief explanation of drawings]

1 and 2 show an embodiment in which the present invention is applied to an optical disk cartridge. FIG. 1 is an enlarged perspective view of the main parts of the optical disk cartridge, and FIG. 2 is a plan view thereof. . 3 and 4 show a conventional optical disk cartridge, and FIG. 3 shows the oblique PI! of the optical disk cartridge. FIG. 4 is an enlarged longitudinal sectional view of the same as above. 1...Disk cartridge 3...Disk 6...Turntable insertion hole 7...Opening 29...Shutter 29a...Closing plate portion 73...-Side edge 73a...- ■Edge Patent Applicant Sony Corporation Representative Patent Attorney Koike Mima Sakae Tamura

Claims (1)

[Scope of Claims] A disk is housed in a case, and at least one side thereof has an opening facing the pickup, and a shutter having a closing plate portion that closes the opening is slidably attached. In the disc cartridge according to the present invention, the opening has a trapezoidal planar shape that becomes wider toward the turntable insertion hole, and at least one side end face is a tapered surface having a predetermined inclination angle. cartridge.