JPS606913Y2 - Disc cassette for recording and playback - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing disk cassette in which a flexible disk-shaped recording medium, such as a sheet-shaped magnetic disk, is rotatably housed in a housing.

Recently, recording and reproducing devices using disk cassettes have been put into practical use.

A magnetic disk is rotatably housed in this disk cassette, and recording/reproduction is performed on the magnetic disk by a magnetic head provided in a main body of a recording/reproducing apparatus, ie, a so-called disk recorder main body.

A magnetic disk is usually made of a flexible sheet-like bark, and a metal core member, so-called a metal core, is attached as a rotational force transmitting member to a hole provided in the center of the magnetic disk.

Then, the magnetic disk is rotationally driven by a motor on the disk recorder main body side via this cored metal.

Conventionally, the magnetic sheet and the core metal have been attached by adhesive, but the cost is high due to the use of adhesive, and the core metal and magnetic sheet are easily misaligned due to temperature changes. was there.

The present invention has been made to overcome these drawbacks, and is a recording and reproducing device in which a disk-shaped recording medium such as a magnetic sheet and a core member can be attached to each other without using an adhesive or the like. They are trying to provide disc cassettes.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments and drawings.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the cassette housing 2 of the disk cassette 1 is composed of an upper half 2a and a lower half 2b made of, for example, injection molded ABS resin containing an antistatic agent. A magnetic disk 3 is rotatably housed inside.

This magnetic disk 3 is composed of a thin disc-shaped polymer film with a thickness of, for example, 0.0471771 mm, and a magnetic head provided on a disk recorder main body (not shown) slides on the lower surface on which a magnetic layer is provided. It is designed to perform recording/playback.

In the figure, reference numeral 4 indicates a nonwoven fabric disposed between the magnetic disk 3 and the cassette housing 2 to protect the magnetic disk 3, and reference numeral 5 indicates a nonwoven fabric placed under the cassette casing 2. A sliding lid is shown for opening and closing the magnetic head insertion hole 6 provided in the half 2b and the elongated hole 7 for inserting the disk holding pad provided in the upper half 2a.

As shown in FIGS. 1 to 3, a circular hole 8 is provided in the center of the magnetic disk 3, and a core bar 9 made of a ferromagnetic material such as stainless steel is arranged in this circular hole 8. There is.

This core bar 9 is formed by press-molding a single disc into a round plate shape, and an outward flange 10 is integrally formed at the opening thereof.

Four cut-and-raised pieces 11 are provided on the outer periphery of the core bar 9, and are arranged at intervals of approximately 90' from each other, and the inner circumferential edge of the circular hole 6 of the sheet-like magnetic disk 3 fits into these cut-and-raised pieces. Piece 1
1 and an outward flange 10.

The core bar 9 is provided with a rectangular hole 12 approximately in the center thereof, through which the motor shaft of the disc recorder body is inserted. A long hole 13 is provided for inserting a position regulating pin on the disc recorder main body side.

When the disk cassette 1 is installed in a predetermined mounting position of the disk recorder main body, the magnetic disk 3 is inserted through the insertion hole 33 provided in the lower half 2b of the cassette housing 2.
The core metal 9 is attracted by a magnet provided on the motor shaft, and the magnetic disk 3 is precisely positioned by the motor shaft inserted into the rectangular hole 12 and the long hole 13, and by the position regulating bottle that rotates with the motor shaft. It is designed to be rotated in a state where it is rotated.

As this drive mechanism, a conventional structure (for example, the structure disclosed in Japanese Patent Application No. 55-11196 by the present applicant) can be used almost as is.
A detailed explanation thereof will be omitted.

As described above, in this example, the sheet-shaped magnetic disk 3 is clamped between the cut-and-raised piece 11 integrally provided on the core bar 9 and the outward flange 10, thereby allowing the magnetic disk 3 to The core bar 9 is attached to each other.

Therefore, there is no need to use adhesive or the like, and easy and reliable installation can be performed at low cost.

Furthermore, since no adhesive or the like is used, the magnetic disk 3 is hardly affected by temperature changes, and therefore the magnetic disk 3 and the metal core 9 do not become misaligned with each other.

4 to 6 show second to fourth embodiments of the present invention, respectively.

In the example shown in FIG. 4, the first embodiment is similar to S゛.
A core metal 16 press-molded into a round plate shape is used.

However, the depth of the recessed portion of the core bar 16 is shallower than that of the first embodiment, and no cut and raised pieces are provided.

To attach this core metal 16 to the magnetic disk 3, first,
This round plate-shaped core metal 16 is inserted into the central circular hole 8 of the magnetic disk 3.
Insert into.

Next, the core metal 16 is pressed and crushed in its depth direction, and the magnetic disk 3 is clamped between the outer peripheral surface 17 and the outward flange 18.

The example shown in FIG. 5 is a modification of the example shown in FIG. 4, in which a ring-shaped reinforcing member 23 made of stainless steel, synthetic resin, etc. It is arranged.

In addition, the core bar 21 includes:
For example, notches 24 are provided at four locations.

In the example shown in FIG. 6, disk holding pieces 30 are provided at, for example, four locations on the inner periphery of the ring-shaped core bar 27.

The magnetic disk 3 is clamped and held by a disk holding piece 30 bent in an S-shape via a ring-shaped reinforcing member 31 made of stainless steel, synthetic resin, or the like.

Although the present invention has been described above with reference to embodiments, the above-mentioned embodiments do not limit the present invention, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the rotational force transmitting member was composed of core metals 9.16 and 21°27 made of ferromagnetic material.
If there is no need for attraction by the magnet on the disk recorder main body side, the core member can be made of a metal material other than ferromagnetic material.

Further, the present invention is also applicable to disk cassettes using recording methods other than magnetic recording methods.

As explained above, in the present invention, a metal core member is arranged in the center hole provided in the disc-shaped recording medium, and the disc-shaped recording medium is clamped in the clamping part provided integrally with the core member. By doing so, these core members and the disk-shaped recording medium are fixed to each other.

Therefore, there is no need to use adhesives or the like as in the conventional case, and it is possible to perform simple and reliable installation at low cost.

Further, since no adhesive or the like is used, there is little relative displacement between the disk-shaped recording medium and the core member due to temperature changes, and the reliability of attachment is increased.

Furthermore, the structure according to the present invention has good workability of the core member,
Also, the number of assembly steps is relatively small.

[Brief Description of the Drawings] Fig. 1 is an exploded perspective view of a disk cassette according to the first embodiment of the present invention, Fig. 2 is an exploded perspective view of the same magnetic disk and core metal, and Fig. 3 is an exploded perspective view of the same as the above. FIG. 4 is an assembly drawing, and FIG.
The figure is a vertical sectional view of the main part similar to FIG. 4 according to the third embodiment,
FIG. 6 is a longitudinal sectional view of a main part similar to FIG. 4 according to a fourth embodiment. In addition, in the symbols used in the drawings, 3... is a magnetic disk, 9, 16, 21, 27... is a core metal.

Claims (1)

[Scope of utility model registration request] In a recording/playback disc cassette in which a disc-shaped recording medium is rotatably housed in a housing, a metal core member is disposed in a center hole provided in the disc-shaped recording medium, and a metal core member is integrally attached to the core member. A disc cassette for recording and reproducing, characterized in that the core member and the disc-shaped recording medium are fixed to each other by sandwiching the disc-shaped recording medium between provided clamping parts.