JPH0658475U - Disk cartridge and its molding die - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the formability of the drive shaft insertion hole of the case in the cartridge to form a disk cartridge in which the rotation failure of the disk-shaped medium is eliminated. A disk cartridge having a disk-shaped medium 2 rotatably housed therein and a drive shaft insertion hole 16 for the medium 2 provided in the case 1, and an inner edge portion of the drive shaft insertion hole 16 By forming the concave portions 18 and 19 on the outer surface side and the inner surface side of the case, when forming the drive shaft insertion hole 16 in the case, by forming the drive shaft insertion hole 16 not by the push-cut structure but by the through core pin, the lateral burr of the hole portion is formed. By eliminating the occurrence of some vertical burrs, the vertical burrs can be accommodated in the concave surface portions 18 and 19 to serve as a highly accurate drive shaft hole, and the reliability of the disk-shaped medium 2 can be greatly improved without rotation failure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk cartridge in which a flexible disk, a hard disk, particularly an optical disk, is rotatably housed in a case, and a molding die thereof.

[0002]

[Prior art]

 In general, an information medium such as a magnetic disk, an optical disk or a magneto-optical disk may be housed in a transparent or semi-transparent case so that the state of being housed in the case can be seen through, and thus it is set as a disk cartridge in a recording / reproducing device. Is used. In the conventional synthetic resin injection molded product of this type of case, as shown in FIGS. 6A and 6B, in the lower case a having the drive shaft insertion hole d of the disk-shaped medium, a straight cylindrical core pin b or a vertical burr is generated. It is known that the hole portion d is formed by a push-cut fixing pin e and a core pin c that is in contact with the fixing pin e for prevention.

[0003]

[Problems to be solved by the device]

 However, when the drive shaft insertion hole is formed by pressing with the core pin in the conventional example, lateral burrs tend to be generated in the pressing hole portion, and some vertical burrs also remain, and due to these burrs, dimensional defects or disk This is a problem that causes a problem that causes noise generation due to poor rotation of the medium. The present invention is intended to eliminate these drawbacks of the prior art, and there is no molding failure of the drive shaft hole, no rotation failure of the medium, no noise generation, and a disk with a high precision drive shaft hole. The purpose is to provide a cartridge with good molding workability.

[0004]

[Means for Solving the Problems]

 The present invention provides a case 1 in which a disk-shaped medium 2 can be rotatably housed, and a drive shaft insertion hole 16 of the medium 2 is provided in the case 1. The disc cartridge is characterized in that concave surface portions 18, 19 are formed on the outer surface side and the inner surface side of the case of the inner edge portion of the case 16.

[0005]

[Action]

 In the disk cartridge having the drive shaft insertion hole for the disk-shaped medium in the case, the inner surface of the drive shaft insertion hole 16 is formed with the concave portions 18 and 19 on the outer side and the inner side of the case. The horizontal burr is eliminated, and even if some vertical burr remains, it is stored in the concave part and does not adversely affect, it does not cause defective rotation of the medium and dimensional defect, and it is a molding cartridge with a high precision drive shaft hole. Can be produced.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to an example of the disk cartridge of FIGS. 1 to 4. A case 1 in which a disk-shaped medium 2 as an information medium is housed in a case 1 and an opening 3 such as a head insertion hole is formed. Further, a shutter 4 having a substantially U-shaped cross section for opening and closing the opening 3 is slidably provided, and the case 1 is composed of an upper case and a lower case, and the case 1 is made of a transparent or translucent resin. In the disk cartridge of the present invention, concave portions 18 and 19 are formed on the outer surface side and the inner surface side of the inner edge portion of the drive shaft insertion hole 16 of the lower case which faces the center core hole portion 10 on the bottom surface of the upper case 1. Formed as a disc cartridge.

Around the center core hole 10 and the drive shaft insertion hole 16, there is provided an annular rib 12 projecting on the inner surface of the case. Concave surface portions 18 and 19 are formed around the drive shaft insertion hole 16 by the core portions 21 and 22 having the same diameter.

In this case, the concave portions 18 and 19 have flat bottom portions parallel to the inner and outer surfaces of the case at a depth of 0.05 to 0.15 mm, and are formed around the drive shaft insertion hole 16. It is good to

As a mold for molding the lower case 1 in which the drive shaft insertion hole 16 of the disk-shaped medium 2 is formed, a cavity 15 is formed from the fixed mold 13 and the movable mold 14, and the drive shaft hole is formed. The core pin 20 is slidably provided at the position of 16, and core portions 21 and 22 for forming recesses are provided on the opposing surfaces of the fixed mold 13 and the movable mold 14 around the drive shaft hole. When the drive shaft insertion hole 16 is formed in the case, the concave surface portions 18 and 19 can be formed, and by forming the drive shaft insertion hole 16 by a through core pin instead of a push-cut structure, the occurrence of lateral burrs in the hole portion is eliminated. The vertical burr is stored in the concave portions 18 and 19 and serves as a highly accurate drive shaft hole, so that the disk-shaped medium 2 does not have a rotation failure and the reliability can be greatly enhanced.

In the figure, 5 is a shutter slide area, and 6 is a clamping plate, which is provided on the medium 2. Reference numeral 7 is a drive shaft, 8 is a shutter lock member, 9 is an erasure prevention plug, 11 is an uneven pattern, and 17 is a medium storage portion. It should be noted that the case 1 is selected and configured as various disk cartridge type shells that house disk-shaped media such as floppy disks, compact disks, video disks, and optical disks.

[0011]

[Effect of device]

 The present invention relates to a case in which a disk-shaped medium can be rotatably housed, and a drive shaft insertion hole for the medium is provided in the case. By forming a concave portion on the inner surface and the inner surface side, horizontal burr is prevented from occurring in the hole, and even if some vertical burr remains, it does not affect the concave portion and will not affect the rotation and size of the medium. Can be produced as a disc cartridge with a high-precision drive shaft hole with good molding workability, and the molding die also contributes to the thinning of the case, so that it can be used without any problems in appearance and the resin The fluidity is good and the form is easy to mold, there are no molding defects, the appearance is good, and the commercial value is increased, which is a practical effect.

[Submission date] December 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

 In general, an information medium such as a magnetic disk, an optical disk or a magneto-optical disk may be housed in a transparent or semi-transparent case so that the state of being housed in the case can be seen through, and thus it is set as a disk cartridge in a recording / reproducing device. Is used. In the conventional synthetic resin injection-molded product of this type of case, as shown in FIGS. 6A and 6B, in the lower case a having the drive shaft insertion hole d of the disk-shaped medium, a straight cylindrical core pin b or a lateral burr is generated. It is known that the hole portion d is formed by a push-cut fixing pin e and a core pin c that is in contact with the fixing pin e for prevention.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of the present invention.

FIG. 2 is a perspective view of the example of FIG. 1 in a separated state.

FIG. 3 is an enlarged plan view showing the inner surface of the lower case of the example of FIG.

FIG. 4 is an enlarged vertical sectional view taken along the line AA of the example of FIG.

5 is a vertical cross-sectional view of a part of the lower case of the example of FIG. 1 in a molded state.

FIG. 6 is a vertical cross-sectional view of a part of a molding state of a conventional example, in which A and B are examples.

[Explanation of symbols]

 1 Case 2 Disk Medium 3 Opening 4 Shutter 5 Shutter Slide Area 6 Clamping Plate 10 Center Core Hole 12 Annular Rib 13 Fixed Mold 14 Movable Mold 15 Cavity 16 Drive Shaft Insertion Hole 18 Concave Surface 19 Concave Surface 20 Core Pin 21 Core part 22 Core part

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 9, 1993

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (3)

[Scope of utility model registration request] 1. A disk cartridge having a disk-shaped medium 2 rotatably housed therein, wherein a drive shaft insertion hole 16 for the medium 2 is provided in the case 1. 2. A disk cartridge, wherein concave surface portions 18 and 19 are formed on the outer surface side and the inner surface side of the case of the inner edge of the disk cartridge. 2. The concave portions 18, 19 have a flat bottom portion parallel to the inner and outer surfaces of the case at a depth of 0.05 to 0.15 mm, and are formed around the drive shaft insertion hole 16. The disc cartridge according to claim 1. 3. A mold for molding the lower case 1 in which a drive shaft hole 16 for a disk-shaped medium is formed, wherein a cavity 15 is formed from a fixed mold 13 and a movable mold 14, and the fixed mold 13 is formed. The core parts 21 and 22 for forming recesses are provided on the opposing surfaces of the movable mold 14 and the movable mold 14, and the core pin 20 for forming the drive shaft hole is slidably provided so as to penetrate through the centers of the core parts 21 and 22. Mold for disk cartridge molding.