JPS6093686A - Disc cartridge - Google Patents

Abstract

PURPOSE:To improve the stability of a ring-like metallic plate and plastic and to reduce manufacturing cost by forming a folding part and a relief part on a part of the ring-like metallic plate of a center core divided into upper and lower parts and fixing the metallic plate and the center core each other. CONSTITUTION:A hollow and cylindrical inner core member 2 is inserted into a center opening part of an outer core member 1. Peripheral groove 1a is formed on the lower surface of the outer core member 1 concentrically with the inner core member 2 and a flange 2a is formed so that the relief part 1b is demarcated between the peripheral groove 1a and the flange 2a. A ring-like metallic plate 3 having the same diameter as that of the outer core member 1 is arranged on the lower surface of the member 1 and its folding part 3a is inserted into a space part 1b and held between the peripheral groove 1a and the flange 2a. A position regulating rib 8 is arranged on the lower surface of the outer core member 1. A disc cartridge is put on a driving means rotating a magnetic disc 4, the ring-like metallic plate 3 and a magnet on the driving means are attracted and coupled each other to be fixed and the magnetic disc 4 is rotated by the rotation of a driving shaft 7.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a disk cartridge which is a replaceable recording medium, and specifically relates to a disk cartridge which is a replaceable recording medium. The present invention relates to a disk cartridge having two parts.

[Background of the invention]

In conventional disk cartridges used in electronic cameras and the like, the hub of the magnetic disk is constructed by integrally outsert-molding a center core made of plastic onto a ring-shaped magnetic plate.

In order to manufacture the hub of a cartridge disk by such outsert molding, a complicated molding die is required and the manufacturing cost is therefore high.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk cartridge that eliminates the drawbacks of the prior art described above, has excellent stability of the ring-shaped metal plate and plastic, and can be manufactured at low cost.

[Summary of the invention]

In order to achieve this object, the present invention provides a method for fixing a ring-shaped metal plate to a center core that is divided into upper and lower parts and can be held together.
The present invention is characterized in that the center core is provided with a bent portion and the center core is provided with a relief portion in which the bent portion of the ring-shaped metal plate engages, thereby making it possible to fix the metal plate and the center core to each other.

[Embodiments of the invention]

Hereinafter, an embodiment of the "Fufuyu" will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of a disk cartridge according to the present invention, in which numeral 1 denotes an outer core part forming one molecule of the center core, and a central entrance part of the outer core part 1 is A hollow cylindrical inner core member 2 forming another part of the center core is inserted and arranged. A circumferential groove 1a is formed on the lower surface of the outer core member 1 concentrically with the inner core member 2, and a space (relief portion) 1 is formed on the circumference of the inner core part I2 between the circumferential groove 1a. A flange 2a is provided to define a section.

A ring-shaped metal plate (magnetic plate) 3 having the same diameter as the outer core member 1 is disposed on the lower surface of the outer core member 1, and a bent portion 3a is provided on the inner circumference of the metal plate 3. 3 a is inserted into the space s1b, and the circumferential groove 1a and the flange 2a
sandwiched between. A position regulating lip 8 protrudes from the lower surface of the outer core member l, and in this embodiment, as shown in FIG.
Individually provided.

To explain further, the outer core member l and the ring-shaped metal plate 3
A magnetic disk 4 is arranged between the two. The structure constructed in this manner is housed within the jacket 5 to constitute a flexible disk cartridge.

In use, such a disk cartridge is placed on a drive mechanism that rotationally drives the magnetic disk 4, and the ring-shaped metal plate 3 and the magnet 6 on the drive mechanism are attracted and fixed to each other, and the rotation of the drive shaft 7 The magnetic disk 4 is rotationally driven.

〔Effect of the invention〕

As explained above, according to the present invention, the center core is
Since it is constructed from S material and has a structure in which a ring-shaped metal plate is sandwiched between these members, the mold can be made of a simple oak structure, and the manufacturing cost is therefore low, making it economical. In addition, it is possible to provide a disk cartridge with excellent functions except for the drawbacks of the prior art described above.

[Brief explanation of drawings]

Figure iA1 is a sectional view showing the disk cartridge according to the present invention and its drive mechanism k'+Mi, and Figure 2 is a back view thereof. 1...Outer core side, 2...Inner core side, lb...Escape capital, 3...Ring-shaped metal plate, 3a. ...Folding capital of Kinpeng board, 4...
...Magnetic disk, 5...Jacket, 6...
... Magnet, 7... Drive shaft. etc. 7 Figure 2

Claims (1)

[Claims] A ring-shaped metal plate is fixed to the 11111 plane in the axial direction of a center core arranged at the center of rotation of a magnetic disk housed in a jacket, and the metal plate is attached to a magnet provided on the drive shaft side for rotationally driving the magnetic disk. In a disk cartridge in which the magnetic disks are rotatably driven by the drive shaft by being mutually attracted to each other, the ring-shaped metal plate is fixed to the center core which is divided into two groups, upper and lower, and which can be held together. , a bent part is provided in one part of the ring-shaped metal plate, and a relief part is provided in which the bent part of the ring-shaped metal plate engages with the center core trap, thereby fixing the metal plate and the center core to each other. A disc cartridge that is characterized by the following: