JPH0419648Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a tape cassette in which a reel is housed in a case.

BACKGROUND ART In recent years, so-called reel-to-reel tape cassettes, in which a pair of reels for winding a tape are housed in a case, have become popular, and especially for home video tape recorders, tape cassettes are equipped with a pair of upper and lower flanges on the reel. Therefore, tape cassettes called the VHS system and the Beta system, which are designed to prevent the tape wound around the core from falling off, have become widely used.

Conventionally, this type of tape cassette was used for, for example, VHS.
In the case of this type, the configuration was as shown in FIG. In FIG. 3, a pair of reels 4, 4 for winding the tape 3 are housed inside the case consisting of an upper half 1 and a lower half 2.
It is pressed toward the lower half 2 by a leaf spring 5 attached to the lower half 2.

This tape cassette is normally used by being attached to a deck with the lower half 2 facing downward as shown in the figure.

As shown in FIG. 4, the reels 4, 4 are
a, an upper flange 4b, a lower flange 4c, and a pivot 4d. Usually, the upper flange 4b is molded from transparent AS resin so that the tape wound around the core 4a can be seen, and the lower flange 4c is formed from a transparent AS resin. Core 4
The pivot 4d is molded integrally with the winding core 4a from polyacetal resin or ABS resin, and the pivot 4d is molded from polyacetal resin either integrally with the winding core 4a or separately. If the pivot 4d is separate, the upper flange 4b is ultrasonically welded to the top of the winding core 4a, sandwiching the pivot 4d.

In FIG. 3, the upper flange 4b and the lower flange 4c usually have substantially the same outer diameter, and the gap A between the lower end of the reel 4 and the edge of the opening of the lower half 2, and the gap between the upper flange 4b and the upper half 1 Gap B
and the gap C between the lower flange 4c and the lower half 2 are equal to each other.

Problems to be Solved by the Invention In this conventional configuration, when vibration or impact is applied to the tape cassette, the upper flange 4b
The lower flange 4c hits the side walls 1a and 2a of the upper half 1 and the lower half 2, respectively, and generates abrasion powder.
If the material of the lower flange 4c is polyacetal or ABS resin with lubricating properties, there will be less wear powder generated in this part, but since the upper flange 4b needs to be transparent, it should be lubricated. It was difficult to prevent wear debris from being generated in this area.

Further, there is a great danger that abrasion powder generated between the upper flange 4b and the upper half 1 will adhere to the tape 3 when it falls toward the lower half 2 due to gravity.

The present invention is intended to solve these drawbacks, and aims to prevent the upper flange of the reel from hitting the upper half.

Means for Solving the Problem In order to solve this problem, the present invention reduces the thickness of a part of the side wall of the upper half.

Effect: This configuration prevents the upper flange from coming into contact with the side wall of the upper half, and prevents the generation of abrasion powder in this area.

Embodiment FIG. 1 is a cross-sectional view of a tape cassette according to an embodiment of the present invention. The same numbers as in the conventional example are used to describe the tape cassette. The overall structure is the same as that in the conventional example, but the upper half 1 A portion of the side wall 1a is thinned. A plan view of the upper half 1 seen from below is shown in the second figure.
As shown in the figure.

In FIG. 2, the upper half 1 has a leaf spring 5 and a pair of windows 6, 6 ultrasonically welded to its main plane 1b, and side walls 1a are erected on three sides thereof. Circle D indicates the outer diameter of the upper flange 4b. A thin wall portion 6 is provided in a portion of the side wall 1a adjacent to the outer diameter circle of the upper flange 4b.

The side wall 1a is usually formed to have a thickness of 1.9 to 2 mm, but in this example, the thickness of the thin wall portion 6 is 1 mm. If the width of the thin portion 6 is approximately 10 mm, even if the thickness is reduced in this manner, the strength against drop impact and the like and the formability of the upper half 1 will be hardly affected. Side wall 1a
Making the entire structure thinner tends to cause problems in terms of strength and formability.

As a result of providing such a thin wall portion 6, as shown in FIG. 1, even if the reel 4 moves within the cassette, the contact between the lower flange 4c and the side wall 2a of the lower half 2 remains the same as in the conventional example. However, the upper flange 4b and the side wall 1a of the upper half 1 are no longer in contact with each other, and therefore no wear debris is generated in this part.

The above result can be similarly obtained even if the outer diameter of the upper flange 4d is made smaller in radius by about 1 mm than the outer diameter of the lower flange 4c, but in that case, the outermost part of the tape 3 is connected to the upper flange. This is not preferable since there is a risk of it falling beyond the outer periphery of 4b. Conversely, if the outer diameter of the lower flange 4c is increased, the range of movement of the reel 4 within the case is narrowed, and there is a risk of contact between the lower flange 4c and the side wall 2a when the tape cassette is mounted on a deck. , I still don't like it.

Effects of the invention As is clear from the above explanation, according to the invention, it is possible to prevent the generation of abrasion powder caused by the contact between the upper flange and the upper half, and to create a tape cassette that does not reduce the strength of the case. It can be realized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a tape cassette according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view showing a conventional tape cassette, and Fig. 4 is a partially exploded view. FIG. 1... Upper half, 2... Lower half, 3... Tape, 4... Reel, 4b... Upper flange, 4c...
...Lower flange, 6...Thin wall part.

Claims (1)

[Scope of utility model registration request] It has a reel consisting of an upper flange, a lower flange, and a winding core for winding the tape around the winding core, and a case for accommodating the reel and consisting of an upper half and a lower half, and the upper half of the both halves. A tape cassette characterized in that only a portion close to the upper flange is made thinner in a direction away from the upper flange.