JPH0216455Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to devices such as floppy disk devices that record or reproduce information signals on a rotating disc-shaped recording medium (hereinafter referred to as a disk). It concerns the disks used.

Conventional Structure and Problems In conventional floppy disk devices, the magnetic disk is engaged with a spindle on the device side and rotates, and signals are recorded on or reproduced from the magnetic disk by a magnetic head on the device side. Ru.

At this time, if the center of rotation of the magnetic disk is not always constant, the relative position between the magnetic head and the magnetic disk will shift, causing problems such as the inability of the magnetic head to accurately scan the recording track during reproduction. To solve this problem, a magnetic disk as shown in FIG. 1 has been devised.

In FIG. 1, a magnetic disk a consists of a magnetic sheet 1 and a resin-molded center core b. This center core b is integrally formed by resin molding so as to form an engaging hole 2, a nip hole 3, and a pressing piece 4 between them. Further, in order to receive the magnetic sheet 1 on the outer periphery of the center core b, there is provided a metal plate 5 which has a flat portion c and is formed into an annular shape with a plurality of holes. A skirt portion 9 for the purpose of dustproofing and approximate positioning when stored in a storage jacket (not shown) that protects the magnetic disk a is molded with the same resin through a plurality of holes in the metal plate 5 together with the core body 6. Insert molded. The magnetic sheet 1 is held by the core cap 7 through the elastic washer 8 without distortion. Then, each component is assembled as shown in FIG. 1, and in order to integrate them into the center core b, the convex part d integrally molded on the core cap 7 and the smooth part e provided on the core body 6 are ultrasonically welded. The purpose is to hold the magnetic sheet 1 continuously and elastically in place.

On the other hand, a spindle (not shown) is provided on the device side to rotate the magnetic disk a, and when inserted into the engagement hole 2 of the core body 6, a magnet (not shown) provided integrally with the spindle is inserted into the engaging hole 2 of the core body 6. )
The metal plate 5 is attracted to. Further, the spindle and center core b are accurately positioned by the pressing piece, and the magnetic disk a rotates integrally with the spindle. The above is a conventional disk, but as mentioned above, in order to continuously clamp and hold the magnetic sheet 1, the core cap 7 is fixed to the core body 6 by ultrasonic welding, etc., so that a defective part occurs in the magnetic sheet 1. In this case, it is impossible to replace only the magnetic sheet 1.
Therefore, a new magnetic disk a with center core b is used each time, and center core b
Therefore, the above-mentioned component parts and the man-hours for assembling them become wasted costs. Another problem was that a process such as ultrasonic welding was essential.

Purpose of the invention The present invention was made in view of the above-mentioned difficulties.It has a simple structure, can reliably clamp and clamp the magnetic sheet continuously, can attach and detach the magnetic sheet with one touch, and can be assembled and assembled. The purpose of the present invention is to provide a disk that does not require secondary processing such as ultrasonic welding for fixing and is inexpensive in terms of cost.

Structure of the invention The invention has a core body and a core cap that is removably fitted onto the core body, and a magnetic sheet and an elastic washer are sequentially inserted onto the smooth part of the core body, and the claws of the core cap are engaged with the core body. Since the core cap and the core body are fitted through a stopper hole, the magnetic sheet can be easily attached to and replaced from the core, and the elastic washer can support the magnetic sheet uniformly and without distortion. This makes it possible to manufacture and use disks inexpensively and easily.

DESCRIPTION OF EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, a magnetic disk a consists of a magnetic sheet 1 and a resin-molded center core b. Center core b has a core body 6, a core cap 11,
It is composed of an elastic washer 8. Core body 6
is integrally formed by resin molding so as to constitute an engaging hole 2, a nip hole 3, and a pressing piece 4 between them. On the outer periphery of the core body 6, there is provided a metal plate 5 which is formed in an annular shape with a flat portion c and a plurality of locking holes 13 for receiving the magnetic sheet 1. Further, a skirt 9 for the purpose of dustproofing and approximate positioning when the magnetic disk a is stored in a storage jacket (not shown) for protecting the magnetic disk a is insert-molded on the metal plate 5 by the same resin molding. The core cap 11 is made of resin molding, and a plurality of L-shaped claws 12 for the purpose of locking with the core body 6 are inserted into a plurality of locking holes 1 of the core body 6.
It is provided at a position opposite to 3.

As shown in FIG. 2, these components are assembled by placing the magnetic sheet 1 on the metal plate 5 of the core body 6, and attaching the core body 6 to the core body 6 with an L-shaped claw 12 provided on the core cap 11 via an elastic washer 8. The magnetic sheet 1 is inserted into a locking hole 13 provided in a metal plate 5, and the magnetic sheet 1 is reliably and continuously clamped with one touch without distortion.

When it becomes necessary to replace the magnetic sheet 1, the locking holes 13 provided in the metal plate 5 of the core body 6 are pressed by pressing the plurality of L-shaped claws 12 formed on the core cap 11. If the core cap 11 is removed, the magnetic sheet 1 can be easily replaced.

Effects of the Invention Since the present invention is configured as explained above, it is possible to securely, reliably, and easily press and hold the magnetic sheet continuously, and the magnetic sheet can be attached and detached with one touch. There are some products that can reduce assembly man-hours and have a large mass production effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a main part showing the structure of an engaging part of a magnetic sheet in a conventional example, and FIG. 2 is an explanatory diagram of a main part showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic sheet, 2... Engaging hole, 4... Pressing piece, 5... Metal plate, 6... Core body, 11... Core cap, 12... Claw, 13... Locking hole.

Claims (1)

[Scope of utility model registration request] an engagement hole provided on the device side into which a spindle is inserted; a pressing piece that elastically presses the spindle inserted into the engagement hole against a side surface of the engagement hole; a plurality of locking holes; It has a core body provided with a smooth part for receiving a magnetic sheet, and a core cap that is removably fitted to the core body, and the core cap has a cross section facing each locking hole of the core body. Approximately V-shaped claws are provided by integral molding, a magnetic sheet and an elastic washer are sequentially inserted onto the smooth portion of the core body, and the claws of the core cap are locked through the locking holes of the core body, thereby forming the core cap and the core body. What is claimed is: 1. A disc-shaped recording medium characterized by having a structure in which a disc is fitted into the disc.