JPH0621092Y2 - Disco Cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a disk cartridge in which a disk such as an optical disk or a magneto-optical disk is housed in a case.

[Outline of device]

The invention is to prevent the tip portions of a pair of upper and lower hole closing plate portions of a shutter that reciprocates with respect to a case for opening and closing an insertion hole of a head or the like from moving in the outer direction of the case. In order to prevent the middle portions of the pair of hole closing plate portions from bending outward in the case, a pair of guide slits, into which the tip portions are inserted and guided, are provided on the upper and lower surfaces of the case. By bending the middle portions of the pair of hole closing plate portions toward the inner sides of the case with respect to both side portions thereof, the hole closing plate portions of the shutter are provided outside the case. It does not bend in the direction.

[Conventional technology]

In a conventional disk cartridge such as an optical disk cartridge, as shown in FIG. 7, a disk 3 is rotatably housed in a case 2 made of synthetic resin or the like. A substantially rectangular recess 8 is formed on both upper and lower surfaces 4, 5 of the case 2 so as to face one side edge 2a of the case 2, and the turntable insertion hole 6 and the optical head insertion hole are formed in the recess 8. 7 are formed. The recess 8, the turntable insertion hole 6 and the optical head insertion hole 7 are formed in the case 2
Are vertically symmetrically provided on both upper and lower surfaces 4, 5. A shutter 9 having a generally U-shaped cross section is slidably attached to the case 2 so as to straddle a pair of upper and lower recesses 8 and one side edge 2a of the case 2. When the disk cartridge 1 is not used, the shutter 9 has a pair of upper and lower hole closing plate portions 9a.
Seals the turntable insertion hole 6 and the optical head insertion hole 7 to prevent dust and the like from entering the case 2.

The shutter 9 is formed by a stainless plate or the like into a generally U-shaped cross section, and is composed of a pair of upper and lower hole closing plate portions 9a and a fork portion 9c connecting the pair of hole closing plate portions 9a. The pair of hole closing plate portions 9a are provided with two elongated, substantially rectangular diaphragms 33 protruding outward for reinforcement. The shutter 9 has a fork portion 9c for the case 2
It is attached to the case 2 by screwing it to the sliding member 12 arranged on the one side edge 2a. Further, the respective tip portions 9b of these hole closing plate portions 9a are shown in FIG.
As clearly shown in FIG. 9, it is inserted into a guide slit 11 which is continuous with the recess 8. Note that the guide slit 11
Is formed below the slit forming member 10 by attaching the slit forming member 10 formed separately from the case 2 to the case 2 at one side edge of the recess 8.

The shutter 9 is slid in the direction of arrow a in FIG. 7 by an interlocking mechanism (not shown) provided inside the case 2 when the disc cartridge 1 is not used. The turntable insertion hole 6 and the optical head insertion hole 7 formed on the upper and lower surfaces 4 and 5 of the case 2 are closed by the portion 9a. Further, since the shutter 9 is slid in the direction of the arrow b by the interlocking mechanism in the case 2 during use, the turntable (not shown) and the optical head (not shown) of the disc player.
Can be inserted into the turntable insertion hole 6 and the optical head insertion hole 7, respectively, for recording and reproduction.

[Problems to be solved by the invention]

However, in this conventional disk cartridge, as shown in FIG. 8, the lower hole closing plate portion of the pair of upper and lower hole closing plate portions 9a of the shutter 9 is moved downward by its own weight during use or storage. When the shutter 9 is bent, the shutter 9 protrudes outside from the inside of the concave portion 8 where the shutter 9 is arranged. When used for a long period of time, as shown in FIG. 9, the pair of upper and lower hole closing plate portions 9a of the shutter 9 both bulge outward and cannot return to their original positions. Particularly, in a disc cartridge in which a large-diameter optical disc having a disc diameter of 300 mm is housed in a case, the case 2 is considerably large and the shutter 9 is also considerably large, and the vertical and horizontal sides of the shutter 9 are, for example, about 230 mm and 83 mm. Therefore, the above-mentioned bending is likely to occur. If the hole closing plate portion 9a of the shutter 9 bends and bulges outward, dust, dust, and the like from the gap will turn into the turntable insertion hole 6.
Also, it penetrates into the case 2 through the optical head insertion hole 7 and adheres to the disk 3, which causes defective recording and reproduction. Further, if the hole closing plate portion 9a of the shutter 9 bends and bulges outward, there also arises a disadvantage that the end portion 9b of the shutter 9 comes off from the lower guide slit 11 of the slit forming member 10. Further shutter 9
The bending of the hole closing plate portion 9a deteriorates the appearance of the disk cartridge and reduces its commercial value. In order to eliminate such a defect, the plate thickness of the shutter 9 may be increased to make it difficult to bend, but this is not preferable from the viewpoint of formability or weight.

[Means for solving problems]

According to the present invention, a disk is housed, a case having insertion holes for heads on both upper and lower surfaces, a pair of upper and lower hole closing plate portions, and a cross section connecting the pair of hole closing plate portions. And a pair of hole closing plate portions along the upper and lower surfaces of the case, and the fork portion moves along one side edge of the case, whereby the shutter is formed. In a disk cartridge configured to reciprocate to open and close the insertion hole by the pair of hole closing plate portions, the respective tip ends of the pair of hole closing plate portions move in the outer direction of the case. In order to prevent the above, a pair of guide slits into which the distal end portion is inserted and guided are provided on the upper and lower surfaces of the case, respectively, and an intermediate portion of the pair of hole closing plate portions is provided outside the case. In order to prevent each of the pair of hole closing plate portions from bending inward, a bending process is performed on each of the pair of hole closing plate portions so that the intermediate portion of the pair of hole closing plate portions is directed toward the inner side of the case with respect to both side portions thereof. The present invention relates to a disk cartridge characterized in that

[Action]

Since the disc cartridge according to the present invention has the above-described structure, the pair of upper and lower hole closing plate portions of the shutter that reciprocates with respect to the case to close the insertion hole of the head or the like is used or stored. Sometimes it does not flex outward of the case.

〔Example〕

An embodiment in which the present invention is applied to an optical disk cartridge will be described below with reference to the drawings. In the optical disk cartridges shown in the following embodiments, the shape of the shutter 29 is changed, and the structures of the slit forming portion 30, the lower inclined surface 24, and the guide slit 25 are changed. It has substantially the same structure as the conventional optical disk cartridge shown in FIG.

As shown in FIG. 1, the case 20 is composed of an upper half 21 and a lower half 22 formed of synthetic resin or the like,
Both are integrally connected to each other by screwing or the like.
Each of the upper half 21 and the lower half 22 is formed with a substantially rectangular recess 8 having a depth of about 1 mm so as to face one side edge of these halves. A head insertion hole 7 is formed. The recess 8, the turntable insertion hole 6, and the optical head insertion hole 7 are vertically symmetrically provided on the upper and lower surfaces 4 and 5 of the case 20. Further, a shutter 29 having a generally U-shaped cross section so as to straddle the pair of upper and lower recesses 8 and one side edge 20a of the case 20 is attached to the case 20 by screwing the fork 29c of the shutter 29 to the sliding member 12. Has been.

The shutter 29 has a thickness of about 0.3 m as shown in FIGS.
The stainless steel plate of m has a U-shaped cross section, and the hole closing plate portion 29a that closes the turntable insertion hole 6 and the optical head insertion hole 7 has both side portions (that is, , In the inner direction of the case 20 with respect to the vicinity of both ends of the hole closing plate portion 29a).
The bent portion 34 is formed by performing a bending process for bending the plate to a depth of about 4 mm, preferably 1 to 2 mm. Further, both tip portions 29b of the shutter 29 are inclined inward, and the both tip portions 29b are connected to the slit forming portion 30.
The shutter 29 is guided by being inserted into the guide slit 25 formed between the lower inclined surface 24 and the lower inclined surface 24. The hole closing plate portion 29a of the shutter 29 is provided with two elongated, substantially rectangular diaphragms 33 protruding outward for reinforcement.

By configuring the shutter 29 as described above, the hole closing plate portion 29a of the shutter 29 does not bend downward even when the case 20 is used or stored in the state shown in FIG. It is prevented that the recesses 8 provided in the upper and lower halves 21 and 22 extend to the outside of the case 20.

As described above, since the hole closing plate portion 29a of the shutter 29 is configured so as not to protrude from the inside of the concave portion 8 to the outside of the case 20, the shutter 29 in the present embodiment.
Slit forming portion 30, which is provided to guide both front end portions 29b of the sheet, the lower inclined surface 24, and the guide slit 2.
The structure of No. 5 is also different from the conventional example shown in FIGS.

That is, the slit forming portion 30 provided at one side edge of the recess 8
Is molded integrally with the case 20 by a mold 50, as shown in FIG.

As a result of forming the slit forming portion 30 as described above, holes 51 are opened in the portions of the halves 21 and 22 located below the slit forming portion 30 as shown in FIG. However, in this case, as described above, the hole closing plate portion 2
9a is configured so as not to protrude from the inside of the recess 8. Therefore, even if the length of the slit forming portion 30 is set to be slightly longer than 1/2 of the width of the concave portion 8, when the shutter 29 is opened, at least the corner portions of both tip portions 29b of the slit forming portion 30 are formed. Therefore, there is no possibility that both tip portions 29b of the shutter 29 will be completely separated from the guide slit 25. It should be noted that no hole 51 is formed in a portion of the one side edge of the concave portion 8 where the slit forming portion 30 does not exist, and only the downward inclined surface 24 that is inclined downward is formed.

In contrast, the hole 51 is the fifth when the case 20 is not used.
Since the upper surface of the shutter 29 is covered with the shutter 29 as indicated by the alternate long and short dash line in FIG. A, dust and the like will not enter the case 20 through the hole 51. Further, since the hole 51 is not provided over the entire length of the one side edge of the concave portion 8, the strength of the case 20 does not decrease so much.

Further, the slit forming member 10 formed separately from the case is adhered to the case by ultrasonic welding or the like.
As compared with the conventional one shown in the figure, it is possible to reduce the bonding process and prevent the slit forming member from falling off.

The bending process performed on the hole closing plate portion 29a of the shutter is not limited to that shown in the above-mentioned embodiment, and as shown in FIG. 6A, two or more places of the hole closing plate portion 29a are performed. The inwardly bent portion 3 of the case 20
4 may be formed. Further, as shown in FIG. 6B, the hole blocking plate portion 29a may be formed with a curved portion 35 that is curved inward of the case 20. Further, as shown in FIG. 6C, bending portions 34a and 34b are formed by bending the central portion of the hole closing plate portion 29a in the lateral direction so as to project inward of the case 20 in a triangular cross section. It may be.

Also, regarding the slit forming portion 30, in order to increase the strength of the case 20 and reduce the area of the hole 51 below the slit forming portion 30, a plurality of slit forming portions 30 having a small length are provided as shown in FIG. 5B. You may make it shape | mold intermittently in a location.

It should be noted that the present invention can be widely applied not only to the optical disk cartridge in which the optical disk is housed in the case but also to other disk cartridges in which the magnetic disk, the magneto-optical disk, etc. are housed. The present invention can be applied not only to a disc cartridge that uses both upper and lower surfaces, but also to a disc cartridge that uses only one of the upper and lower surfaces.

[Effect of device]

According to this invention, in order to prevent the front end portions of the pair of upper and lower hole closing plate portions of the shutter that reciprocate with respect to the case for opening and closing the insertion hole of the head or the like from moving in the outer direction of the case. , The distal end portions are inserted into and guided by a pair of guide slits provided on both upper and lower surfaces of the case, and the middle portions of the pair of hole closing plate portions are prevented from bending outward of the case. In order to achieve this, a bending process is performed on the pair of hole closing plate portions so that the intermediate portions of the pair of hole closing plate portions are directed inwardly of the case with respect to both side portions thereof. Therefore, since the pair of upper and lower hole closing plate portions of the shutter does not bend outward in the case and bulge outward, it is possible to prevent dust, dust, etc. from entering from the outward bulge portion. Therefore, it is possible to effectively prevent the recording / reproducing failure of the disk.

Further, it is possible to effectively prevent the shutter from coming off the case due to the above-mentioned bending.

Further, by preventing the above-mentioned bending, it is possible to prevent the appearance of the disk cartridge from being deteriorated and the commercial value thereof from being lowered.

[Brief description of drawings]

1 to 6 show an embodiment in which the present invention is applied to an optical disc cartridge. FIG. 1 is an enlarged perspective view of a main part of the optical disc cartridge, and FIG. 2 is a shutter shown in FIG. FIG. 3 is a perspective view, FIG. 3 is a vertical cross-sectional view of the disk cartridge shown in FIG. 1, and FIG. 4 is a cross-sectional view of the vicinity of a guide slit at the time of molding the upper and lower halves shown in FIG.
FIG. 5A is a plan view of the case shown in FIG. 1 near the lower sloping surface, FIG. 5B is a plan view showing a modification near the lower sloping surface shown in FIG. 5A, and FIGS. 6A to 6C are second views. It is a perspective view which each shows the modification of the shutter shown in the figure. 7 to 9 show a conventional optical disk cartridge. FIG. 7 is a perspective view of the optical disk cartridge, FIG. 8 is a longitudinal sectional view of the same as above, and FIG. FIG. In the reference numerals used in the drawings, 4 ... upper surface 5 ... lower surface 6 ... ten table insertion hole 7 ... optical head insertion hole 20 ... case 25 ... guide slit 29 ... shutter 29a ... hole closing plate Part 29b ...... Tip part 29c ...... Fork part 34, 34a, 34b ...... Bent part 35 ...... Curved part

Claims (1)

[Scope of utility model registration request] 1. A cross-section comprising a case in which a disk is housed and in which insertion holes for heads and the like are provided on both upper and lower surfaces, a pair of upper and lower hole closing plate portions, and a fork connecting the pair of hole closing plate portions. A shutter having a substantially U-shape, wherein the pair of hole closing plate portions move along both upper and lower surfaces of the case, and the fork portions move along one side edge of the case, respectively. In a disk cartridge configured to reciprocate to open and close the insertion hole by the pair of hole closing plate portions, respective tip portions of the pair of hole closing plate portions move in the outer direction of the case. In order to prevent this, a pair of guide slits into which the distal end portion is inserted and guided are provided on the upper and lower surfaces of the case, respectively, and an intermediate portion of the pair of hole closing plate portions is provided outside the case. In order to prevent each of the pair of hole blocking plate portions from bending in the lateral direction, a bending process is performed on each of the pair of hole blocking plate portions so that the intermediate portion of the pair of hole blocking plate portions is directed toward the inner side of the case with respect to both side portions thereof. A disc cartridge characterized by being applied.