JPH06187761A - Disk cassette - Google Patents

Abstract

PURPOSE:To prevent an error by using an nonwoven fabric at one part of the liner and a sheet member of a low friction material with higher stiffness than the nonwoven fabric at another part of the liner and constituting the liner by joining the nonwoven fabric to the sheet member. CONSTITUTION:Since the nonwoven fabric 2a covers the whole radius area of the disk D, the whole of the disk D is uniformly cleaned. Because the joining part of the nonwoven fabric 2a and the sheet member 2b is bonded by fusing with a heat seal, a cutting edge where a fiber become easely frayed is only an area A shown in figure. Consequently, the degree of the fiber frayed and come off is very lessened compared with a conventional liner 2 whole cutting edge of which is the area where the fiber is easily frayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cassette provided with a liner for cleaning a disk, and to improvement of the liner.

[0002]

2. Description of the Related Art A conventional disc cassette is shown in FIG. In FIG. 13, the shell 1 is an upper shell portion 1a.
And a lower shell portion 1b, and these shell portions 1a, 1
The peripheral part of b is joined. A disc D, which is a recording medium, is rotatably provided in the shell 1, and a liner 2 is provided between both surfaces of the disc D and the inner surfaces of the upper shell portion 1a and the lower shell portion 1b facing the both surfaces. Are arranged respectively.

Each of the liners 2 has a cutout hole 6 in a portion corresponding to the rotation center hole 3 and the head insertion hole 4 of the lower shell portion 1b, but has a shape that makes contact with substantially the entire surface of the disk D as much as possible. is doing. The lower liner 2 is shown in FIG.
As shown in FIG. 5, for example, heat welding is performed on the lower shell portion 1b at points B (illustrated by solid lines) at regular intervals on the entire outer peripheral edge except for a part. Lifter 5 near the area that is not heat welded
Is provided, and the lifter 5 lifts the liner 2 toward the disc D side. The upper liner 2 is, for example, heat-welded to the upper shell portion 1a at points at regular intervals on the entire outer peripheral edge. Thus, each liner 2 wipes dust, dust and the like on the disc D when the disc is rotated by its wiping effect, and takes it in between the fibers to clean the surface of the disc D.

[0004]

However, the above-mentioned conventional liner 2 is made of a non-woven fabric, and is produced by punching out a band-shaped non-woven fabric 7 into the shape shown in FIG. Then, the non-woven fabric is mainly composed of fibers such as polypropylene, polyester and rayon alone or mixed at an appropriate ratio, and the fibers are joined by a binder or heat welding so as not to be frayed, so that when cut, the cutting edge ( There is a defect that fibers are frayed from the liner 2) and fallen off, and the fallen fibers cause an error such as dropout.

Therefore, it is an object of the present invention to provide a disc cassette which prevents the above-mentioned inconvenience caused by the fibers of the liner fraying and falling off as much as possible.

[0006]

DISCLOSURE OF THE INVENTION A disk cassette according to the present invention for achieving the above object is provided with a disk rotatably provided in a shell, and both surfaces of the disk and respective inner surfaces of the shell facing the both surfaces. In the disc cassette, each of which is provided with a liner capable of contacting substantially the entire surface of the disc, a sheet having a liner, a non-woven fabric in a part, a low friction material in the other part, and a higher rigidity than the non-woven fabric. The non-woven fabric and the sheet member are joined together by using a member.

[0007]

Since a part of the liner is made of non-woven fabric and the non-woven fabric and the sheet member are joined together, the fibers are less likely to be frayed from the cutting edge at this joining point and fall off, and the range of the cutting edge where the fibers are easily frayed is reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. The disc cassette of the first embodiment is the same as the conventional example except for the configuration of the liner 2, so the same reference numerals are given to the drawings and the description thereof will be omitted, and only the configuration of the liner 2 will be described. That is, as shown in FIG. 1, the liner 2 has a circular shape having a cutout hole 6 in the corresponding portion of the rotation center hole 3 of the lower shell portion 1b and the head insertion hole 4 as in the conventional one, and the nonwoven fabric 2a ( Non-woven material 2a, which is a low friction material
The sheet member 2b having higher rigidity is joined and configured.

Each liner 2 is supported by the shell by adhering the peripheral portion of the sheet member 2b to the lower shell portion 1b or the upper shell portion 1a. A lifter 5 is provided at a position of the lower shell portion 1b corresponding to the non-woven fabric 2a, and the non-woven fabric 2a is lifted to the disc D side by the lifter 5.

As shown in FIG. 2, the non-woven fabric 2a and the sheet member 2b are joined so that the non-woven fabric 2a is placed on the disk D side and heat-sealed at all the joints.

Specific examples of the sheet member 2b include nylon sheet, polyester sheet, PP sheet and the like, but from the viewpoint of antistatic property and abrasion resistance, a high density polyethylene sheet (about 5% for polyethylene having a molecular weight of 400,000) is used. Surface electrical resistance of 5 × 10 ″ Ω / with the addition of percent carbon
It is preferable that an sq level product is obtained and formed into a sheet (thickness: 80 μm) by an inflation method.

As shown in FIG. 3, the liner 2 is manufactured by arranging strip-shaped sheet members 2b on both sides of the strip-shaped non-woven fabric 2a and pressing the heating roller 10 to the joints on both sides of the non-woven fabric 2a. The original fabric 11 in which the joint portions of both members are heat-sealed is obtained. This is completed by punching into the shape shown in FIG.

In the above structure, the wiping effect of the lower liner 2 is mainly performed at the portion pushed up by the lifter 5, and the nonwoven fabric 2a is arranged at this portion, so that a cleaning effect close to that of the conventional one can be expected. . Since the nonwoven fabric 2a covers the entire radius area of the disc D, the entire disc D is uniformly cleaned. Since the non-woven fabric 2a is heat-sealed at the joint with the sheet member 2b, the fibers are frayed and are unlikely to fall off.
Only the range indicated by A is shown. Therefore, as compared with the conventional case where all the cutting edges of the liner 2 are in the range where the fibers are easily frayed, the degree of the fibers fraying and falling off is very small.

Further, since the liner 2 having a cushioning property with respect to the shell 1 has the same outer diameter as the outer diameter of the disk D, the disk D does not come into direct contact with the shell 1 and the disk D may be damaged during transportation. There is no.

In the first embodiment, the non-woven fabric 2a and the sealing member 2b are joined by heat sealing, but an adhesive may be used instead.

FIG. 5 shows a modification of the first embodiment. In this modification, the punching arrangement relationship between the nonwoven fabric 2a and the seal member 2b with respect to the original fabric 11 is rotated by 90 degrees. This modified example also has the same effect as the above, but the range of the cutting edge in which the fibers are easily frayed is slightly wider than that in the first example.

6 to 8 show a second embodiment of the present invention. The disc cassette of the second embodiment is also almost the same as the conventional example except for the configuration of the liner 2, so the same reference numerals are given to the drawings, the description thereof will be omitted, and only different components will be described. That is, in FIG. 6, the liner 2 is composed of the nonwoven fabric 2a and the sheet member 2b as in the first embodiment, but the outer shape of the liner 2 is the same as the inner surface shape of the lower shell member 1b or the upper shell member 1a. It has a square shape. The locking holes 12 are formed at the positions of the sheet member 2b corresponding to the four corners of the liner 2. A locking projection 13 is provided at a position of the lower shell portion 1b corresponding to each locking hole 12, and a receiving portion 14 (shown in FIG. 7) is provided at a position of the upper shell portion 1a. The liner 2 has the locking hole 12 of the locking projection 1 of the lower shell part 1b.
3 and is supported by the shell 1. Liner 2
The joining state between the non-woven fabric 2a and the seal member 2b and the procedure for manufacturing the original fabric 11 of the liner 2 are the same as those in the first embodiment, and the original fabric 11 may be punched into the shape shown in FIG.

Also in the second embodiment, the same operational effect as that of the first embodiment can be obtained. When the product is judged to be defective in the manufacturing process, the shell 1 is disassembled into the upper shell part 1a and the lower shell part 1b, and the liner 2 is pulled out from the locking projection 13 to separate the liner 2 and the shell 1 from each other. Therefore, there is an advantage that the shell 1 and the like can be easily collected as a recycled product.

FIG. 9 shows four kinds of modified examples of the locking projections 13, and FIG. 10 shows two kinds of modified examples of the liner 2. The liner 2 shown in FIG. 10 has four locking holes 12
Two of them are formed into long holes, and have the advantage that they are not affected by contraction due to changes in the environment.

FIG. 11 shows a third embodiment. In FIG. 11, in the third embodiment, the joint overlapping portion L between the nonwoven fabric 2a and the sheet member 2b is wide, and the highly rigid sheet member 2b projects toward the disc D side at this overlapping portion L. As a result, the non-woven fabric 2a of the overlapping portion L is lifted to the disc D side, and the lifting amount A is larger than the total of the thickness a of the non-woven fabric 2a and the thickness b of the sheet member 2b (A> a + b).
Is configured. With this configuration, there is an advantage that the lifter 5 need not be provided.

FIG. 12 shows a fourth embodiment. In FIG. 12, not only the shell 1 but also the sheet member 2b of the liner 2 is made of a transparent member. With this structure, the inside of the shell 1 can be observed.

By using a film laminated with polypropylene having a high heat-sealing property as the sheet member 2b, the bondability with the nonwoven fabric 2a can be improved. The sheet member 2b may be coated with silicon or carbon on the surface of polyester, polyethylene, nylon or the like to obtain the required rigidity, thickness and low friction.

[0023]

As described above, the first to third aspects are provided.
According to the invention, since the liner is composed of the non-woven fabric and the sheet member having the predetermined characteristics, the range of the cutting edge of the non-woven fabric in which the fibers are easily frayed is reduced, so that the error such as the dropout caused by the frayed and dropped fibers is minimized. The effect is that it can be prevented.

Further, according to the invention of claim 2, since the liner is supported by the shell by the locking hole and the locking projection, the liner and the shell can be easily separated and the shell and the like can be recycled. There is also. According to the invention of claim 3, since the joining overlap portion between the non-woven fabric of the liner and the sheet member is widened and the non-woven fabric is lifted to the disc side so that the sheet member is projected toward the disc side,
There is also the effect that the lifter becomes unnecessary and the cost is reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a disc cassette (first embodiment).

FIG. 2 is a cross-sectional perspective view of a joining portion of a liner nonwoven fabric and a liner (first embodiment).

FIG. 3 is a diagram showing a method of making a liner original sheet (first example).

FIG. 4 is a diagram showing a punched state with respect to an original fabric (first embodiment).

FIG. 5 is a front view of a liner (modification example).

FIG. 6 is an exploded perspective view of a disc cassette (second embodiment).

FIG. 7 is a sectional view of a main part of a disc cassette (second embodiment).

FIG. 8 is a view showing a punched state with respect to an original fabric (second embodiment).

9A, 9B and 9C are perspective views (modifications) of the locking projections.

10A and 10B are perspective views (modifications) of the liner.

11A and 11B are perspective views of a joint overlapping portion between a nonwoven fabric of a liner and a sheet member (third embodiment).

FIG. 12 is a plan view of a disc cassette (fourth embodiment).

FIG. 13 is an exploded perspective view of a disc cassette (conventional example).

FIG. 14 is a plan view showing a mounted state of a liner (conventional example).

FIG. 15 is a view showing a punching state with respect to an original fabric (conventional example).

[Explanation of symbols]

 D ... Disc 1 ... Shell 2 ... Liner 2a ... Nonwoven fabric 2b ... Sheet member 12 ... Locking hole 13 ... Locking projection L ... Joining overlap portion

Claims (3)

[Claims] 1. A disk is rotatably provided in a shell,
In a disc cassette in which a liner capable of contacting substantially the entire surface of the disc is provided between both faces of the disc and inner faces of the shell facing the both faces, the liner, a part of the nonwoven fabric, and the other A disc cassette, characterized in that a sheet member having a low friction material and higher rigidity than the non-woven fabric is used for a portion, and the non-woven fabric and the sheet member are joined together. 2. A locking hole is provided in the sheet member of the liner, and the locking hole is inserted into a locking projection of the shell to support the liner on the shell. Disc cassette described in. 3. The joint overlapping portion between the nonwoven fabric and the sheet member of the liner is widened, and the sheet member is projected toward the disc at the joint overlapping portion to lift the nonwoven fabric toward the disc side. The disk cassette according to claim 1 or 2, wherein