JPH0973757A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the reduction of the friction coefficient of a friction sheet and improvement of the performance by forming a part corresponding to a transparent window and other parts of the friction sheet with different synthetic resins. SOLUTION: The part 6a of the friction sheet 6 corresponding to the transparent window 2a formed on a half 2 is formed with a polyethylene terephtalate PET. By this arrangement, the condition of the magnetic tape 4 wound round a pair of taking up and supplying hubs 5 is visible through the window 2a. A translucent or opaque material such as a polyethylene with super high molecular weight is used for the part 6b other than the window part 6a of the sheet 6. Then, the friction coefficient of the part 6b is defined as 0.2-0.3 against the tape 4, and this part is joined to the surface of an outer edge part of the part 6a at the side of hubs 5. Thus, the appearance of the tape cassette 1 is not impaired while making the function of the window 2a to be satisfied, and the friction between the part 6b and tape 4 is reduced, thereby reducing the damage or running failure due to the friction of tape 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotatably accommodates a pair of take-up / supply hubs each having a magnetic tape wound in a cassette body composed of an upper half and a lower half. A tape cassette that has a friction sheet mounted between the hub and the upper half, and has a transparent window in the center of the upper half that corresponds to the pair of winding / supplying hubs and is formed of a transparent member. More specifically, regarding the advantages of the cassette body of the tape cassette having the transparent window and the polyethylene terephthalate (hereinafter PE)
The present invention relates to a tape cassette that reduces the friction coefficient of the friction sheet and improves the performance of the friction sheet without impairing the advantages of the friction sheet manufactured by T).

[0002]

2. Description of the Related Art Generally, a pair of take-up / supply hubs around which a magnetic tape is wound are rotatably housed in a cassette body composed of an upper half and a lower half, and a pair of the above-mentioned pair of take-up / supply hubs is rotatably provided. There is a friction sheet mounted between the winding / supply hub and the upper half, and the central portion of the upper half corresponding to the pair of winding / supply hubs is a transparent window formed of a transparent member. Tape cassettes are well known. In such a tape cassette, the friction sheet prevents disturbance of the magnetic tape wound around the hub. Also, the transparent window allows the amount of winding and the winding state of the magnetic tape wound from the outside to the winding / supply hub to be visually observed from the outside. As the friction sheet of the tape cassette as described above, a PET-made one is often used. With a tape cassette that uses a friction sheet made of PET, PE
Since the friction sheet made of T has appropriate rigidity,
It has an advantage that winding disorder can be effectively prevented. Also, PET
Since the manufactured friction sheet is transparent, it also has an advantage that the function of the transparent window described above can be satisfactorily exhibited.

However, since the friction sheet made of PET has a high coefficient of friction, in a tape cassette using this friction sheet made of PET, the running of the tape becomes unstable and errors and noises at the time of recording and reproducing signals occur. It can increase or damage the tape. On the other hand, a friction sheet formed of a resin other than PET, which has appropriate rigidity for preventing winding disorder and has a low friction coefficient, is usually opaque, so that the function of the transparent window is not sufficiently exerted, and the tape cassette has The appearance is impaired.

Therefore, an object of the present invention is to reduce the friction coefficient of the friction sheet and improve the performance of the friction sheet without impairing the advantages of the cassette body of the tape cassette having the transparent window and the advantages of the PET friction sheet. It is to provide a tape cassette designed.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a pair of winding / supplying hubs each having a magnetic tape wound therein are rotatably housed in a cassette body composed of an upper half and a lower half, and the pair of windings is provided. A transparent sheet formed by a transparent member is provided in the center portion of the upper half corresponding to the pair of winding / supply hubs, which has a friction sheet mounted between the supply hub and the upper half. In the tape cassette,
The friction sheet is provided with a portion corresponding to the transparent window made of polyethylene terephthalate, and the other portion is made of synthetic resin other than polyethylene terephthalate. Has been achieved.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the tape cassette of the present invention will be specifically described below with reference to the drawings. 1 is an exploded perspective view showing an embodiment of the tape cassette of the present invention, FIG. 2 is a plan view of a friction sheet in the tape cassette of FIG. 1, and FIG. 3 is an exploded plan view of the friction sheet of FIG. FIG. 4A is a view showing a window portion, FIG. 4B is a view showing other portions, and FIG.

As shown in FIG. 1, the tape cassette 1 of the present embodiment has a pair of take-up / supply hubs 5 and 5 in which a magnetic tape 4 is wound inside a cassette body composed of an upper half 2 and a lower half 3. Rotatably accommodated therein, and has a friction sheet 6 mounted between the pair of winding / supply hubs 5 and 5 and the upper half 2, and the pair of winding / supply hubs in the upper half 2 The central portions corresponding to 5 and 5 are transparent windows 2a formed of a transparent member. The tape cassette 1 of the present embodiment will be described in detail. The tape cassette 1 of the present embodiment is a tape cassette for DAT, and a lid that opens and closes the front end of the cassette main body by rotating in the cassette main body. 7 and a slider 8 that covers the lower half 3 and slides in the front-rear direction to close the opening 3a of the lower half 3. A friction sheet 9 is also mounted between the winding / winding hubs 5 and 5 and the lower half 3. Each of the above-mentioned configurations is the same as the conventionally known technique.

Thus, in the tape cassette 1 of this embodiment, as shown in FIGS. 2 and 3, the friction sheet 6 is made of PET at a portion (hereinafter referred to as a window portion) 6a corresponding to the transparent window 2a. And form the other portion 6b
It is made of synthetic resin other than ET.

The present embodiment will be described in detail. Through the transparent window 2a formed in the upper half 2, the winding amount and the winding state of the magnetic tape 4 wound around the winding / supply hubs 5 and 5 are increased. It is visible from the outside of the half 2. The window portion 6a of the friction sheet 6 is the transparent window 2
It has a substantially rectangular shape similar to that of a, and has hub through-holes 6c, 6c through which the winding / supply hubs 5, 5 are inserted, at portions facing the winding / supply hubs 5, 5. There is. The portion 6b of the friction sheet 6 other than the window portion 6a is made of ultra-high molecular weight polyethylene and is semitransparent or opaque. The friction coefficient of this portion 6b is 0.2 to 0.3 with respect to the magnetic tape.
The longitudinal elastic modulus is about 50,000 Kgf / cm ² . As shown in FIG. 4, this portion 6b is joined to the surface of the outer edge portion of the window portion 6a on the winding / supply hub 5, 5 side.

In the tape cassette 1 of this embodiment having the friction sheet 6 having the above-mentioned structure, the window portion 6a of the friction sheet 6 is made of PET and is transparent, so that the function of the transparent window 2a is fully exerted. At the same time, the appearance of the tape cassette 1 is not impaired. Further, the window portion 6a of the friction sheet 6 and the other portion 6b
Since each of them has an appropriate rigidity, winding disorder of the magnetic tape 4 can be effectively prevented. Furthermore, since the other portion 6b is formed of ultra-high molecular weight polyethylene having a friction coefficient of 0.2 to 0.3, this portion 6b and the magnetic tape 4 are
The friction between the magnetic tape 4 and the magnetic tape 4 is reduced, and damage to the magnetic tape 4 due to the friction and poor running are reduced.

Further, in particular, the tape cassette 1 of this embodiment
Then, since the magnetic tape 4 does not substantially contact the window portion 6a, damage to the magnetic tape 4 due to friction and poor running can be further reduced.

The friction sheet 6 described above is manufactured as follows, although not particularly limited thereto. That is, the sheet of the window portion 6a is punched out separately from PET and the other portion 6b is punched out from ultra-high molecular weight polyethylene, and these are individually attached to the inner wall of the upper half 2 of the tape cassette 1.

The present invention is not limited to the above-mentioned embodiment, and the specific shape, size, material, etc. of each member are as follows.
Changes can be made as appropriate without departing from the spirit of the present invention. For example, the other portion 6b is made of fluoropolymer, polyvinylidene chloride (PVC), in addition to the above-mentioned ultra high molecular weight polyethylene.
It is possible to use a sheet made of, a condenser paper, or the like. Further, the type of tape cassette to which the present invention is applied is not particularly limited, and in addition to the tape cassette for DAT as in the above-described embodiment, a tape cassette having no flange such as a compact cassette tape or a micro cassette tape. Can be applied to. Furthermore, the present invention can be applied to a tape cassette in which no friction sheet is mounted between the lower half 3 and the winding / supply hubs 5 and 5.

[0014]

As described above, according to the tape cassette of the present invention, the friction coefficient of the friction sheet is reduced without impairing the advantages of the cassette body of the tape cassette having the transparent window and the advantages of the polyethylene terephthalate friction sheet. As a result, the performance of the friction sheet is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of a tape cassette according to an embodiment of the present invention.

FIG. 2 is a plan view showing a friction sheet in the tape cassette of FIG.

3 is an exploded plan view of the friction sheet shown in FIG. 2, in which (a) is a window portion and (b) is another portion.

FIG. 4 is a sectional view taken along line XX of the friction sheet of FIG.

[Explanation of symbols]

 1 Tape Cassette 2 Upper Half 2a Transparent Window 3 Lower Half 3a Opening 4 Magnetic Tape 5 Winding / Supply Hub 6 Friction Sheet 6a Window 6b Others 6c Hub Through Hole 7 Lid 8 Slider 9 Friction Sheet

Claims (2)

[Claims] 1. A pair of take-up / supply hubs around which a magnetic tape is wound are rotatably housed in a cassette body composed of an upper half and a lower half, and the pair of take-up / supply hubs and the upper half are provided. In a tape cassette having a friction sheet mounted between the upper half and a transparent window having a central portion corresponding to the pair of winding / supply hubs formed of a transparent member in the upper half, the friction sheet is A tape cassette, wherein a portion corresponding to the transparent window is formed of polyethylene terephthalate, and the other portion is formed of a synthetic resin other than polyethylene terephthalate. 2. The tape cassette according to claim 1, wherein the synthetic resin other than the polyethylene terephthalate is ultra high molecular weight polyethylene.