JPS629578A - Disc cartridge - Google Patents

Abstract

PURPOSE:To avoid generation of damage to a disc recording medium by providing an opening having a width more than a half of the width of a plate spring at the center of the plate spring. CONSTITUTION:The plate spring 9 having an opening 9' has a shape as shown in figure. The thickness 9a is selected as 90mum, which is nearly 3 times that of a conventional thickness and 2/3 of the flat part of the plate spring 9 is opened. The width 9b of the spring is selected as the full width and the width of the openings is expressed as 9c, 9d, then relation of (9c+9d)/9b 2/3 is established. In the state as shown in figure that the plate spring 9 as above is in contact with the disc recording medium 1 and liners 7a, 7b, the plate spring 9 gives a proper weight of 2-3g to the disc recording medium 1 and the lower liner 7b and a load.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk cartridge rotatably containing a disk-shaped recording medium such as a magnetic disk.

Conventional technology In recent years, floppy disks have made a remarkable entry into the field of magnetic recording, and recently, floppy disks that are protected and housed in hard case cartridges have come into widespread use, making them easier to use. Ta.

The above-mentioned disk cartridge will be explained below with reference to the drawings.

In FIG. 3, the disk-shaped recording medium 1 is on the top.

It is rotatably housed inside a disk cartridge formed by combining lower hard cases 2a and 2b, and a drive pin rotates the disk-shaped recording medium 1 through a center window 3. When recording and reproducing information on the disk-shaped recording medium 1, the shutter plate 5 covering the head window 4 rotates to close the head window 4.
Recording and playback becomes possible by opening the . The leaf spring 6 locally presses the lower liner 7b against the disk-shaped recording medium 1. Also, the disk-shaped recording medium 1 and the lower liner 7b
The liners 7a, 7b are brought into contact with the disc-shaped recording medium 1 at other locations other than those pressed against the plate springs 6, and dirt, dust, etc. attached to the disc-shaped recording medium 1 are cleaned by contact between the liners 7a and 7b and the disc-shaped recording medium 1.

By the way, when recording and reproducing on the disk-shaped recording medium 1,
Disk disease If fine dust, dirt, etc. adhere to the recording medium 1, there is a very high risk of erroneous recording or reproduction, so as mentioned above, it is necessary to clean the disk-shaped recording medium 1 during use. This structure is used. The optimal load that the leaf spring exerts on the liner 7b and the disc-shaped recording medium 1 is 2 to 3 f, and if the load is larger than this, there is a great risk that the leaf spring 6 will plastically deform the disc-shaped recording medium 1. It becomes expensive. On the other hand, if the load is too weak, a situation may arise in which the liners 7a and 7b cannot sufficiently clean the disc-shaped recording medium 1, so managing the load on the leaf spring 6 is an important item.

Problems to be Solved by the Invention Currently, leaf springs use foil with a thickness of 30 .mu.m, which is specially selected to produce a minute load of 2 to 3 f. However, due to its thinness, foil with a thickness of 30 μm can easily bend or deform due to careless handling of the solder during the parts processing process, parts transportation, and assembly process into the case. Resulting in.

Furthermore, since 30 μm foil is a material that is difficult to obtain as a raw material for processing parts, the procurement of parts is often delayed significantly compared to the production schedule, causing problems in work. In addition, raw material costs are also relatively high.

The present invention has been made in view of these points, and is made of easily available materials that are difficult to bend or deform during parts processing, transportation, and assembly processes, and do not cause plastic deformation of the disk-shaped recording medium. In addition, the leaf spring also has good cleaning properties for disc-shaped recording media.

The purpose of the present invention is to provide a disc cartridge having the following functions.

Means for Solving the Problems In order to solve the above problems, the present invention provides an opening in the center of the leaf spring that is more than half the width of the leaf spring.

For production The effect of this technical means is as follows.

In a leaf spring for cleaning a disk-shaped recording medium by urging a liner, the thickness is, for example, 2.
It is made ~3 times thicker, and instead, the flat part of the leaf spring is opened more than half of the total width of the leaf spring. If you simply increase the thickness of the leaf spring, the leaf spring load will far exceed the appropriate load, so by opening the flat part of the leaf spring, you can lower it to the appropriate leaf spring load and apply the normal load to the liner and to a disk-shaped recording medium.

As a result, even if the thickness of the leaf spring is increased to the thickness of a material that is generally easily available, it is possible to satisfy the load required of a conventional leaf spring.

Embodiment' An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the shape of a leaf spring 9 according to the present invention,
It has an opening q. The thickness 9a is the conventional 30μm 3
The thickness was doubled to 90 μm, and the koji on the flat surface of the leaf spring was opened. Here, 9b represents the full width of the leaf spring, and 9C99d represents the opening width. Even if the plate spring thickness 9a and the plate spring opening width 9C19d are combined to form a predetermined load, the dimensions and shape of this embodiment are not adopted.

FIG. 2 is a sectional view showing a state in which the leaf spring 9 according to the present invention is in contact with the disk-shaped recording medium 1 and the liners 7a and 7b. In this state, the leaf spring 9 applies a load of 2 to 3 g to the disk-shaped recording medium 1 and the lower liner 7b.

Effects of the Invention As described above, according to the present invention, conventional parts defects caused by the thickness of the leaf spring, such as deformation and bending, are drastically reduced, and the workability and time required for handling the leaf spring are greatly improved. Furthermore, no damage occurs to the disk-shaped recording medium.

[Brief explanation of the drawing]

Fig. 1 is an external view of a leaf spring of a disc cartridge according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a disc cartridge according to the present invention when the leaf spring is attached, and Fig. 3 is a conventional disc cartridge. FIG. 1... Disc-shaped recording medium, 2a...
Upper hard case, 2b...Lower hard case, 3
...Center window, 4...Head window, 6...Shutter plate, 7a...
...Top liner, 7b...Bottom liner, 9
・・・・・・Plate spring, q・・・・Opening. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] A center window that rotatably houses a flexible disc-shaped recording medium and into which a driving body for rotationally driving the disc-shaped recording medium can be inserted; a head window into which a magnetic head can be inserted; a shutter plate which selectively opens and closes the head window; a liner made of a nonwoven fabric that sandwiches the disc-shaped recording medium from both sides; A disk cartridge comprising a hard case divided into upper and lower halves and having a plate spring that presses the liner, the disk cartridge having an opening having a width equal to or more than half the width of the plate spring in the center of the plate spring. .