JP3347772B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge in which a hard disk, in particular, a disk-shaped medium such as an optical disk is rotatably housed in a case.

[0002]

2. Description of the Related Art Generally, an information medium, for example, a magnetic disk, an optical disk or a magneto-optical disk is used as a cartridge housed in a case and set in a recording / reproducing apparatus. Conventionally, in this type of medium, an opening for inserting a recording / reproducing head and a drive shaft is formed in a case, a disk-shaped medium is rotatably inserted into the drive shaft opening, and a head insertion opening is formed. The disk cartridge is provided with a shutter that opens and closes.

[0003]

In the conventional disk cartridge, the head insertion opening formed in the case is not chamfered in the cross-sectional direction or has only one chamfer. However, when there is no chamfering on the outer surface, the edge of the shutter and the opening end come into contact with each other.Therefore, there is a problem that the shutter is caught by the case and cannot be opened and closed smoothly, or the case is shaved and resin powder is generated. Also, if there is no chamfer on the inner surface, the edge of the disk-shaped medium may come into contact with the edge of the case, causing the problem of damaging the surface of the medium, the shaving powder having the adverse effect of dropout, and the operation of rotating the disk. There was a problem that rotation was not possible due to lack of smoothness. The present invention can smoothly slide both the disk-shaped medium and the shutter, eliminates damage to the disk-shaped medium, improves reliability, and prevents scraping without adverse effects such as dropout and case damage. It is an object of the present invention to provide a disk cartridge that can be used safely for a long time.

[0004]

SUMMARY OF THE INVENTION The present invention provides a shutter for rotatably storing a disk-shaped medium in a case having an opening through which a recording / reproducing head and a drive shaft can be inserted, and for opening and closing the opening. In a disk cartridge slidably provided in a case, at least an end surface of the opening in the rotation direction of the disk-shaped medium has chamfers on both an inner surface and an outer surface of the case, and a thickness of an opening edge end surface of the opening.
Step at the joint between the fixed mold and the movable mold at the middle part in the direction
This is a disk cartridge with a difference portion interposed .

[0005]

According to the present invention, at least the end face in the rotation direction of the disk-shaped medium in the opening of the case has chamfers on both the inner surface and the outer surface of the case, so that both the disk-shaped medium and the shutter to be inserted into the opening are formed. Sliding is smooth, and it can be rotated without scraping or scratching even if it comes into contact.No scraping occurs, and furthermore, the disc cannot be rotated, smooth operation is guaranteed, and safety and reliability are significantly improved. Used. In addition, the case opening
The inner surface of the case recedes at the middle in the thickness direction of the edge of the opening edge.
The intervening stepped portion makes it easier for molding to occur during molding.
Move the rim to the step side to remove burrs and scratches
It is to prevent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to an example of a disk cartridge shown in FIGS. 1 to 3. A disk medium 2 of an information medium is accommodated in a case 1 and an opening 3 into which a drive shaft can be inserted. , the case 1 formed with the opening 3 _1, such as head insertion holes, a substantially U-shaped cross section of the shutter 4 cartridge having slidably a for opening and closing the opening 3 _1, the case 1 above consists of a case and a lower case, at least an end surface of the rotating direction of the disc-shaped medium 2 of the head insertion opening 3 ₁ formed in the casing 1, provided with a chamfer 11, 12 in both cases the inner and outer surfaces As a disk cartridge.

[0007] The opening 3 _1, in which the step portion 14 in the thickness direction intermediate portion 13 of the opening edge surface is interposed, i.e., the fixed mold of the mold for the case forming the movable mold seam and is convenient to the embodiment utilizing (parting surface), the parting plane thickness direction intermediate burrs easily occur in molding since an intermediate portion in the thickness direction of the opening 3 ₁ It can also be moved to the department. When the inner side of the case is retracted, the step 14 is not visible from the outer surface of the cartridge, so that the appearance is improved.

In the drawing, reference numeral 5 denotes a shutter lock member,
_It is pivotally supported by ₁ and is used by being locked by the shutter 4. 6
Is a clamping plate, 7 is an erasure prevention plug, 10
Is for sliding the shutter 4 having a U-shaped cross section in the shutter area. The case 1 is selected and configured for various types of cartridges such as a floppy disk, a compact disk, a video disk, and an optical disk.

[0009]

According to the present invention, at least the end face in the rotation direction of the disk-shaped medium in the head insertion opening is provided with chamfers on both the inner surface and the outer surface of the case.
When rotating the disk-shaped medium, the sliding of both the disk-shaped medium and the shutter can be safely operated without contacting the case, there is no abrasion or damage, there is no problem that the disk-shaped medium can not be rotated, and the case There are few phenomena of medium damage such as rubbing or shaving, and generation of shaving powder, so that reliability can be significantly improved without hindering recording / reproduction such as dropout, and burrs that are likely to occur during molding are reduced in thickness. It can be moved to the middle part in the vertical direction at the same time, and can prevent scraping and scratching due to burrs, improve quality and durability, and have practical effects such as easy and inexpensive manufacture.

[Brief description of the drawings]

FIG. 1 is a perspective view of a separated state of an embodiment of the present invention.

FIG. 2 is an enlarged plan view of an upper case of the example of FIG. 1;

FIG. 3 is an enlarged vertical sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 2 Disk-shaped medium 3 Drive shaft opening 3 ₁ Head insertion opening 4 Shutter 5 Shutter lock member 6 Clamping plate 7 Plug 11 Chamfered portion 12 Chamfered portion 13 Intermediate portion 14 Stepped portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-98666 (JP, A) JP-A-2-5174 (JP, U) JP-A-3-10377 (JP, U) JP-A-61-1 182971 (JP, U) JP-A-63-96665 (JP, U) JP-B-62-48304 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/03-23 / 033

Claims (2)

(57) [Claims] 1. A disk-shaped medium is rotatably accommodated in a case having an opening through which a recording / reproducing head, a drive shaft, and the like can be inserted, and a shutter slidably provided in the case to open and close the opening. In the disk cartridge, at least an end surface of the opening in the rotation direction of the disk-shaped medium includes chamfers on both the inner surface and the outer surface of the case ,
A fixed mold can be attached to the middle part in the thickness direction of the edge of the opening.
A disc cartridge having a step portion formed by a joint with a moving die . 2. The step portion, wherein the inside of the case is recessed.
2. The disk cartridge according to claim 1, wherein