JPS60247875A - Disk cartridge - Google Patents

Abstract

PURPOSE:To minimize the fluctuation of the thickness of liners so as to obtain stable running torque, by constituting a disk cartridge of a center window, head window, liners putting a recording medium in between them, and a hard case which is equipped with a liner fitting section whose thickness is made thicker than the basic thickness of the hard case and divided into upper and lower parts. CONSTITUTION:The thickness 12 of hard cases 2a and 2b at a liner fitting section 8 is set about 4/3 times thicker than the basic thickness 10 of the hard cases 2a and 2b and the thickness 13 of liners 7a and 7b (under a non-loaded condition) is set to 1/5 or less of the thickness 12 of the hard case 2a and 2b at the liner fitting section 8. In the case of the hard case thus constructed, the thickness of the liner fitting section 8 of the hard cases 2a and 2b becomes thicker and their formability is improved. In addition, the curvature of the surface is minimized and flow of the resin at the time of forming is improved. Moreover, since the thickness of the liners 7a and 7b is reduced, fluctuation of the thickness of the liners 7a and 7b is minimized and, as a result, the running torque of a discoidal recording medium 1 is stabilized.

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 configurations and their problems In recent years, there has been a remarkable increase in the entry of disk cartridges into the magnetic recording field.In particular, there are many types that protect and store magnetic disks with hard cases (cartridges) to make them easier to use. It is starting to be used.

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

FIG. 1 shows an exploded perspective view of a conventional disk cartridge. 1 is a disk-shaped recording medium, 2a is an upper hard case,
2b is the lower hard case, 3 is the center window, 4 is the head window, 5 is the shack plate, 6 is the leaf spring, 7
a indicates "ni liner," 7b indicates the lower liner, and 8 indicates the liner section.

In FIG. 1, a disk-shaped recording medium 1 has upper and lower hard cases 2! It is rotatably housed inside a disk cartridge formed by combining L 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 tape-shaped recording medium 1, the shutter plate 5 covering the head window 4 rotates to open the head window 4, thereby enabling recording and reproducing. The leaf spring e locally presses the lower liner 7b made of nonwoven fabric against the disk-shaped recording medium 1. The twisted disc-shaped recording medium 1 and the lower liner 7b came into contact with each other at locations other than those pressed by the leaf spring 6, and the liners 71L, 7b and the disc-shaped recording medium 1 came into contact with each other, causing the lower liner 7b to adhere to the disc-shaped recording medium 1. Clean dirt, dust, etc.

By the way, when recording and reproducing on the disk-shaped recording medium 1,
Fine dust on the disk-shaped recording medium 1.

If dust or the like is attached, there is a very high risk of erroneous recording or erroneous reproduction, which is why the structure in which the disk-shaped recording medium 1 is cleaned during use as described above is used.

The running torque required to rotate the disk-shaped recording medium 1 is determined by the contact state between the liners 72L, 7b and the disk-shaped recording medium 1.

In addition, the thickness variation of liners 7a and 7b, which is approximately 900 μm (measured under no load), is ±75 μm.
This level of variation in the liners 7a and γb can greatly affect the running torque required to rotate the disk-shaped recording medium 1. and about 900
Liners 7a and 7b with a thickness of about μm (measured under no load)
Due to manufacturing process reasons, variations of about ±76 μm are unavoidable. Liner 7a currently in use
g7b is a liner with a thickness of approximately 9o○μm (measured under no load) as described above, and as mentioned above, with this thickness, the running torque value varies greatly, and the disc-shaped recording medium 1 is driven to rotate. The negative effect on the motor is extremely large.

In addition, the hard cases 2a and 2b are made by injection molding thermoplastic resin for reasons such as productivity and cost. There are issues regarding the flow of government, anti-Shi, etc.

FIG. 2 shows a longitudinal section of the hard cases 2a, 2b. hard case 2a in liner attachment part 8;
The thickness 9 of 2b is the hard case 2a.

It is equal to the basic thickness 1Q of 2b. Also liner γ&.

7b (unloaded state) 11 is 9% or more of the thickness of the hard cases 2a, 2b at the liner attachment portion 8.

If the hard cases 2a and 2b are formed to have a thin wall thickness over the entirety, this will cause a serious problem in terms of resin molding.

Purpose of the Invention The present invention makes the running torque for rotationally driving a disk-shaped recording medium very stable with little variation, and also greatly improves the resin moldability of the hard case surrounding the disk-shaped recording medium. The purpose of the present invention is to provide a TiSF cartridge with less repulsion.

Structure of the Invention In order to achieve the above-mentioned objects, the TIF cartridge of the present invention incorporates a flexible disk-shaped recording medium in a rotatable state, and allows insertion of a driving body for rotationally driving the disk-shaped recording medium. A center window, a head window that allows insertion of a magnetic head for recording or reproducing information on a disk-shaped recording medium, a liner made of non-woven fabric that sandwiches the disk-shaped recording medium from both sides, and a thickness that is thicker than the basic thickness of the hard case. The liner installation consists of a 7-door case divided into upper and lower halves.

With the above configuration, the average position where the liner and disk-shaped recording medium come into contact and cleaning does not change, but the liner can be thinned by increasing the thickness of the node case when attaching the liner. As a result, variations in liner thickness are reduced and stable running torque can be obtained.

DESCRIPTION OF EMBODIMENTS FIG. 3 shows an embodiment according to the present invention. Here, FIG. 3 is a longitudinal cross-section of the hard cases 2a and 2b. Basically, the components are the same as those in FIGS. 1 and 2, so the same figure numbers are given and explanations are omitted.

Node case 2a in liner attachment portion 8.

The thickness of 2b is 12, and the basic thickness of hard cases 2a and 2b is 1.
0, and the thickness of the liners 7a and 'yb is 1
3 (no load state), the thickness of the hard case 22L and 2b at the liner attachment portion 8 was set to be equal to or less than V6 of the thickness 12. In addition, the liner 72L is attached to the liner attachment part 8.

The total thickness 14 with the liners 7b attached is basically equal to the total thickness 15 with the liners 7a and 7b attached to the conventional liner attachment portion 8. Note that the structure of the portion holding the leaf spring 6 is also the same as the conventional one.

In the disk cartridge configured as described above, the thickness of the liner mounting portion 8 of the hard case 21.2b is thickened, improving moldability, reducing surface warping, and improving resin flow during molding. . Furthermore, as the liners 7a and ab became thinner, the variation in the thickness of the liners 7a and yb became smaller as shown in FIG. 4, and the running torque of the disk-shaped recording medium 1 was accordingly stabilized.

Effects of the Invention As described above, according to the present invention, the fluctuation in liner thickness due to thinning of the liner is reduced,
Along with this, the variation in running torque has been drastically reduced to about 1/3 of the conventional level.

By increasing the thickness of the case at the liner mounting area by about twice as thick, the amount of warpage on the surface of the case was improved by about 30%, and the flowability of the resin was greatly improved compared to conventional methods, so resin molding was The manufacturing takt time was reduced to 4μ.

As described above, it has various advantages and is a dog of practical value.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a conventional disk cartridge, FIG. 2 is a sectional view taken in the longitudinal direction of FIG. 1, and FIG. 3 is a longitudinal sectional view of a disk cartridge according to an embodiment of the present invention. , FIG. 4 is a characteristic diagram showing the relationship between the liner thickness and the amount of variation thereof. 1... Disc-shaped recording medium, 2a... Upper case, 2b... Lower case, 3...
...Center window, 4. ...Head window, 5. Old shutter plate, 6.. Leaf spring, 7a.. Upper liner, 7b.. Lower liner, 8...Liner attachment part, 9...Hard case 2a at liner attachment part 8; Thickness of 2b, 1o...Basic thickness of hard case, 11...
... Thickness of liner ya, 7b, 12 ... Hard case 2a in liner attachment part 8 according to the present invention,
Thickness of 2b, 13...liner 71 according to the invention.
Thickness of 7b, 14...Total thickness according to the present invention, 15
...Total thickness. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 15 Figure 3 Figure 4 Thickness (Retsu Nuda 9 Tenshu)

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, and a center window for recording or reproducing information on the disc-shaped recording medium. The hard case has a head window into which a magnetic head can be inserted, and a liner made of non-woven fabric that sandwiches the disc-shaped recording medium from both sides. A disk cartridge characterized in that the basic thickness of the hard case is made thicker.