JP2581872Y2 - 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 small disk cartridge (such as a mini disk).

[0002]

2. Description of the Related Art FIG . 2 shows a small disk cartridge.
(For example, a mini-disc) in a perspective view.
It is composed of The body 1 has a position reference hole RE
FERENCE HOLE 3a, 3b available, record and playback
When loading a disk cartridge into the device,
It serves as a reference guide for determining the mechanical position. For this reason,
The hole 3a has a diameter of 3 mm and a tolerance of 0 to +0.01.
The elliptical hole 3b has a major axis of 4.2 mm and a tolerance of 0 to +
Up to 0.2, with a minor diameter of 3 mm and a tolerance of 0 to +0.07
It is a tight tolerance. In addition, these REFER
Disk cars that make up ENCE HOLE 3a, 3b
The main body 1 side of the cartridge is a through hole, and the lid 2 side is not penetrated.
Hole.

[0003]

FIGS. 4 (a), 4 (b), and 4 (b) show the structure of a hole in the case where an integrated cartridge is formed by combining a main body 1 and a lid 2 with conventional plastic molding.
It is shown in (c). For example, as shown in FIG. 4A, when the seam is 5, the diameter D1 of the through hole and the diameter D3 of the non-through hole are the same. In this case, since D1 = D3,
There is a defect that D3−D1 <0 (D1−D3 <0) due to mold processing accuracy, errors during plastic molding, and variations during assembly.

[0004] Further, as shown in FIG.
Of the boss 8 and the inner periphery 11 of the boss 10 on the non-through hole side 7
In the case of a structure that fits in, the through-hole side 6 or the non-through-hole side 7
The tip of either boss 8, 10 protrudes from the joint 12 of the disk cartridge. In a plastic molding die, protruding from the joint 12 has a drawback that the processing of the die becomes complicated.

Further, as shown in FIG. 4C, there is an example in which a boss 8 is provided on the through-hole side 6 and no boss is provided on the non-through-hole side 7. In this case, the length of the boss 8 is generally up to the seam 12 in the thickness direction because the processing of the mold becomes complicated. Therefore, there is a disadvantage that a gap having a dimension a is generated inside the disk cartridge.

[0006]

According to the present invention, there is provided a body having a position reference hole formed in a boss protruding therein, and a lid having a recess formed in a boss protruding opposite to the position reference hole of the body. Wherein the tip surface of the boss projecting from the main body and the lid and the boss protruding from the main body and the lid are abutted or minute when the main body and the lid are fitted. The recess has a hole diameter larger than the position reference hole, and the hole diameter of the recess is smaller than the outer diameter of the boss having the position reference hole .

[0007]

Therefore, it is possible to prevent variations in the dimensions of the REFERENCE HOLE that occur when the main body of the disk cartridge and the lid are fitted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, and shows a cross section of REFERENCE HOLE 3a, 3b of the disk cartridge shown in FIG. Body 1 (through hole side) is REFE
There is a boss 8 for defining the hole diameter D1 of the RENCE HOLES 3a, 3b. The cover 2 (on the non-through hole side) is provided with a boss 10 for defining the hole diameter D2. And the hole diameter D2 is the hole diameter D1
When the main body 1 and the lid 2 are fitted to each other, the hole diameter is large enough to absorb the accumulation error generated due to the variation.

The protruding front end face 4 of the boss 8 and the protruding front end face 13 of the boss 10 are in contact with each other so that no gap is formed in the joint 12 when the main body 1 and the lid 2 are fitted. Is formed. Therefore, the REFERENCE HOLE constituted by the fitting of the main body 1 and the lid 2 can prevent variation in the hole diameter due to variation at the time of fitting. The heights of the bosses 8 and the bosses 10 to the tip end surfaces 4 and 13 do not protrude from other portions in the thickness direction of the main body 1 or the lid 2, and the joints formed on the outer peripheral surface when fitted are formed. It is equal to the height up to 12.

As another embodiment, as shown in the cross-sectional view of FIG. 3, the tip surface 4 of the boss 8 and the tip surface 13 of the boss 10 are processed when the main body 1 and the lid 2 are fitted. In order to compensate for errors in accuracy and assembly, they may be opposed to each other with a small gap. Even in this case, the height up to the tip surfaces 4 and 13 is
It does not protrude from other parts in the thickness direction of the main body 1 or the lid 2.

[0011]

[Effects of the Invention] According to the present invention, it is possible to simplify the die machining of a small disk cartridge. In addition, assembly can be facilitated and defects can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a REFERENCE HOLE of a small disk cartridge showing an embodiment of the present invention.

FIG. 2 is a perspective view of a small disk cartridge.

FIG. 3 is a REFERENCE showing another embodiment of the present invention.
Sectional drawing of HOLE.

FIG. 4 (a), (b) and (c) show conventional REFERENCE.
Sectional drawing which shows the structure of HOLE.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3a, 3b REFERENCE HOLE 4,13 Tip surface 5,12 Seam 6 Through hole 7 Non-through hole 8,10 Boss 9 Outer periphery of boss 11 Inner periphery of boss

Claims (2)

(57) [Scope of request for utility model registration] A main body having a position reference hole formed in a boss protruding therein; and a lid having a concave portion provided in a boss protruding in a position opposed to the position reference hole of the main body. In a disc cartridge configured by fitting a lid, the tip surface of the main body and the lid and a boss protruding from the lid abut when the main body and the lid are fitted, and the hole diameter of the concave portion is smaller than that of the position reference hole . A disc cartridge characterized by being larger than a hole diameter and a hole diameter of the concave portion being smaller than an outer diameter of a boss having the position reference hole . 2. A main body having a position reference hole formed in a boss protruding therein, and a lid having a concave portion formed in a boss protruding opposite to the position reference hole of the main body. In the disk cartridge configured by fitting the lid, the tip surface of the main body, the lid, and the boss projecting from the lid face each other with a minute gap when the main body and the lid are fitted, and the hole diameter of the concave portion is formed. Is larger than the hole diameter of the position reference hole, and the hole diameter of the concave portion is outside the boss having the position reference hole.
A disk cartridge having a smaller diameter .