JPH1196720A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the degree of freedom in shutter shapes by molding the shutter of a disk cartridge of a resin without the degradation in its strength and without the generation of flashes, etc. SOLUTION: This cartridge has a lower case 10 which is provided with apertures 11 and 21 for insertion of a head for recording and reproducing or a driving shaft, etc., and a freely slidable shutter 40 which rotatably houses a disk-shaped medium 30 within an upper case 20 and opens and closes the apertures 11 and 21. In such a case, the shutter 40 is formed of a resin molding member of an approximately U shape in section consisting of an upper plate 41, a lower plate 4 and a connecting plate 43 connecting these plates. The plane of the shutter 40 in parallel with the connecting plate 43 is provided with butt surfaces of a stationary mold and moving mold of metal molds. These butt surfaces and the inside surface of the connecting plate 43 are made flush with each other at both right end left ends 43b of the connecting plate 43. The plate thickness is made larger toward the inside surface side via a step part from both right end left ends 43b of the connecting plate 43 toward a lateral intermediate part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disk-shaped medium,
More particularly, the present invention relates to a disk cartridge in which an optical disk or a magneto-optical disk capable of recording and reproducing information on both sides or one side is rotatably housed in a case.

[0002]

2. Description of the Related Art A disk-shaped medium such as a magnetic disk, an optical disk or a magneto-optical disk is housed in a case composed of an upper case and a lower case and used as a disk cartridge. An opening for inserting a recording / reproducing head, a drive shaft and the like is formed in the case of the disk cartridge, and a shutter for opening and closing the opening is provided.

As this type of shutter, for example, a shutter disclosed in Japanese Patent Application Laid-Open No. 7-226046 can be mentioned. The shutter is made of aluminum, stainless steel, or the like, and has a thin U-shaped cross-section by bending a thin plate by press working or the like.

[0004]

However, since the shutter of the above-mentioned conventional disk cartridge is formed by bending a metal thin plate into a desired shape, it is impossible to provide a large projection or the like in part in manufacturing. It is. For this reason, there is a problem that the degree of freedom in designing the shutter is limited. On the other hand, it is conceivable to mold the shutter with resin, but with a resin shutter, the strength (impact strength, etc.) is extremely reduced as compared with a metal shutter, and burrs are generated, resulting in molding failure. There was a problem.

Accordingly, an object of the present invention is to improve the flexibility of the shutter shape by molding the shutter from resin without reducing the strength of the shutter of the disk cartridge and without generating burrs or the like. .

[0006]

In order to solve the above-mentioned problems, a first aspect of the present invention is to dispose a disk-shaped medium in a case provided with an opening for inserting a recording / reproducing head or a drive shaft. In a disk cartridge which is rotatably housed and has a slidable shutter for opening and closing the opening, the shutter is made of a resin having a substantially U-shaped cross section including an upper plate, a lower plate, and a connecting plate for connecting these. A member, and provided a butt surface between a fixed mold and a movable mold of a molding die in a plane parallel to the connection plate of the shutter, and at both left and right ends of the connection plate, the butt surface and the inner surface of the connection plate. And the thickness of the connecting plate is increased from the left and right end portions to the middle portion in the left and right direction via a stepped portion toward the inner surface side.

According to a second aspect of the present invention, in the disk cartridge according to the first aspect, an R-chamfered portion is provided at an inner side corner of a connecting portion between the upper plate and the lower plate and the connecting plate at a thicker portion. And no chamfers are provided at the left and right ends.

[0008]

According to the first aspect of the present invention, the inner surfaces of the right and left ends of the shutter connecting plate coincide with the butting surfaces of the molding dies. Accordingly, both left and right ends of the shutter connecting plate are constituted only by fixed dies. Thus, the fixed mold and the movable mold can be easily combined with each other, and the occurrence of burrs at both left and right ends of the connecting plate can be suppressed. Further, the connecting plate is formed so that the plate thickness is increased from both left and right end portions toward the middle portion in the left and right direction. Therefore, when the shutter is mounted on the disk cartridge, the thicker portion of the connecting plate comes into contact with the case. Thereby, the strength of the shutter can be increased.

According to the second aspect of the present invention, a portion provided with an R chamfer is in contact with the case on the inner surface side of the connecting plate. Therefore, even if an impact is applied to the shutter, stress concentration can be reduced, and generation of cracks and the like can be suppressed.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded schematic perspective view showing an embodiment of the disk cartridge of the present invention. 2A and 2B show a state in which the upper case 20 is removed with the shutter 40 incorporated therein. FIG. 2A is a plan view in which a part is cut, and FIG. 2B is a front view. The disk cartridge 1 is configured such that a disk-shaped medium (optical disk) 30 is rotatably housed therein, and the lower case 10 and the upper case 20 are overlapped.

Openings 11 and 21 for inserting a recording / reproducing head or a drive shaft of the information recording / reproducing apparatus are formed in both the lower case 10 and the upper case 20, respectively. That is, the disc cartridge 1 is capable of recording / reproducing information on both sides of the disc-shaped medium 30. Of these openings 11 and 21, portions 11 a and 21 a opened in an arc shape are portions into which the drive shaft is inserted, and portions 11 b and 21 opened in a substantially rectangular shape.
b is a portion where the recording / reproducing head is inserted.

The shutter 40 having a substantially U-shaped cross section
It is slidably attached to both sides of the lower case 10 and the upper case 20, and opens and closes the openings 11 and 21 of the lower case 10 and the upper case 20. Further shutter 40
Is fixed to the slider 53. The slider 53 guides the shutter 40 from the closed position of the openings 11 and 21 to the open position, and urges the shutter 40 to the closed position by a spring. A guide member 51 that guides the distal end of the shutter 40 from the outside is attached to the lower case 10 and the upper case 20. The guide member 51 is fixed to the lower case 10 and the upper case 20, respectively, by bonding or welding.

The erroneous erasure prevention plug 52 is for preventing erroneous erasure of information recorded on the disk-shaped medium 30, and is used by switching to an erasable / non-erasable position by sliding. This erroneous erasure prevention plug 52 is
On the inner surface side of the disk-shaped medium 30, two for the upper surface and the lower surface of the disk-shaped medium 30 are independently attached.

Next, details of the shutter 40 will be described. FIG. 3 is a perspective view showing the shutter 40 of FIG. 1 in detail. The shutter 40 includes an upper plate 41 that slides on the upper case 20, a lower plate 42 that slides on the lower case 10,
By a connecting plate 43 connecting the upper plate 41 and the lower plate 42,
It has a substantially U-shaped cross section. Further, a protruding portion 43a is provided at a central portion of the connecting plate 43. Projection 4
Reference numeral 3a is provided to allow the side wall 43c formed by the protruding portion 43a and the other portion to come into contact with the shutter opening / closing member of the information recording / reproducing apparatus. The connecting plate 4
The thickness is different between the left and right end portions 43b of 3 and the other portions, which will be described later.

Next, a method of manufacturing the shutter 40 will be described. The shutter 40 is formed (eg, injection-molded) using a resin material (eg, polyacetal resin). If the shutter 40 is formed using a resin material, the manufacturing cost can be reduced, the weight can be reduced, and a complicated shape can be formed.

FIG. 4 shows a mold 1 for molding the shutter 40.
FIG. 4 is a cross-sectional view illustrating a portion of a connecting plate 43, which is a cross-sectional view of FIG. FIG. 5 is a cross-sectional view showing the AA cross section of FIG. 4, FIG. 6 is a cross-sectional view showing the BB cross section of FIG. 4, and FIG. It is a perspective view. The mold 100 includes a fixed mold 101 provided on the upper side and a movable mold 102 provided on the lower side. The space formed by the fixed mold 101 and the movable mold 102 constitutes the connection plate 43.

As shown in FIG. 5, the movable mold 102 includes a center core 102a and slide cores 102b disposed on both sides thereof and sliding in the left-right direction in the figure. The space formed by the center core 102a and the fixed mold 101 constitutes the connection plate 43, and the center core 102a and the slide core 102b
The space formed by the above constitutes the upper plate 41 and the lower plate 42.

In FIG. 5, at the left and right ends 43b of the connecting plate 43, the fixed die 101 and the slide core 1 are connected.
02b and the center core 102
In the figure of a, it is formed so that the position in the height direction may coincide with the upper surface (that is, the inner surface of the connecting plate 43). That is, the left and right end portions 43b are formed only in the fixed mold 101. Thereby, the fixed mold 101 and the movable mold 102 (the center core 102a and the slide core 1)
02b) can be easily configured. In addition, it is possible to suppress the occurrence of burrs at the left and right ends 43b of the connecting plate 43.

On the other hand, left and right end portions 43b of the connecting plate 43
In other places, as shown in FIG.
2a, the upper surface is lower than the butting surface 103. As shown in FIG.
This is because 2a is provided with a step portion 102c from the left and right end portions 43b of the connecting plate 43 toward the middle portion in the left and right direction. Thereby, the plate thickness of the portion other than the left and right end portions 43b of the connecting plate 43 becomes larger than the plate thickness of the left and right end portions 43b.

Further, the corners between the upper surface and the side surfaces of the center core 102a are connected to the left and right ends 43 of the connecting plate 43.
At the point b, it is formed at a substantially right angle as shown in FIG. 5, but at the other parts, as shown in FIG.
2d is provided. As a result, the corners on the inner surface side of the connection between the upper plate 41 and the lower plate 42 and the connecting plate 43 are not provided with the R chamfers at the left and right end portions 43b, but are otherwise provided (the plate portion is formed by the stepped portion 102c). In a portion where the thickness is increased, R chamfers corresponding to the upper case 10 and the lower case 20 are provided.

When the shutter 40 is formed as described above, when the shutter 40 is mounted on the disc cartridge 1, the portions of the shutter 40 that come into contact with the lower case 10 and the upper case 20 of the connecting plate 43 are located on both left and right sides. This is a portion other than the end portion 43b (a portion where the plate thickness is increased by the step portion 102c). Further, an R-chamfer is provided at a corner portion on the inner surface side of the connecting portion between the upper plate 41 and the lower plate 42 and the connecting plate 43 at the abutting portion. Therefore, even if an impact is applied to the shutter 40, stress concentration can be reduced, and generation of cracks and the like can be suppressed.

[0022]

According to the first aspect of the present invention, the fixed die and the movable die can be easily combined with each other, and the die can be easily manufactured. In addition, it is possible to suppress the occurrence of burrs on the shutter and remove molding defects. Further, the strength of the shutter can be increased. Furthermore, according to the second aspect of the present invention, even when a shock is applied to the shutter, stress concentration can be reduced, and generation of cracks and the like can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded schematic perspective view showing an embodiment of a disk cartridge according to the present invention.

2A and 2B show a state in which a shutter is incorporated and an upper case is removed, and FIG.
(B) It is a front view.

FIG. 3 is a perspective view showing the shutter of FIG. 1 in detail.

FIG. 4 is a cross-sectional view showing a mold for molding a shutter, showing a portion of a connecting plate.

FIG. 5 is a sectional view showing an AA section in FIG. 4;

FIG. 6 is a sectional view showing a BB section of FIG. 4;

FIG. 7 is a perspective view taken along the line CC in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc cartridge 10 Lower case 11 Opening 20 Upper case 21 Opening 30 Disc-shaped medium 40 Shutter 41 Upper plate 42 Lower plate 43 Connecting plate 43a Projection 43b End 43c Side wall 51 Guide member 52 Erroneous erasure prevention plug 53 Slider 100 Gold Mold 101 Fixed mold 102 Moving mold 102a Center core 102b Slide core 102c Stepped portion 102d R chamfer 103 Butting surface

Claims (2)

[Claims] 1. A disk-shaped medium is rotatably housed in a case provided with an opening for inserting a recording / reproducing head or a drive shaft and the like, and a slidable shutter for opening and closing the opening is provided. In the disk cartridge, the shutter is a resin molded member having a substantially U-shaped cross section including an upper plate, a lower plate, and a connecting plate that connects the upper plate and the lower plate, and a fixing die of a molding die in a plane parallel to the connecting plate of the shutter. A butting surface of a mold and a movable mold is provided, and at the left and right ends of the connecting plate, the butting surface and the inner surface of the connecting plate coincide with each other. A disk cartridge characterized in that the plate thickness is increased toward the inner side through a step portion toward the disk cartridge. 2. The disk cartridge according to claim 1, wherein an R-chamfer is provided at an inner side corner portion of a connecting portion between the upper plate and the lower plate and the connecting plate at a portion where the plate thickness is increased.
A chamfer is not provided at both left and right end portions.