JPH0527873U - Small tape cassette - Google Patents

Abstract

(57) [Summary] [Construction] The protrusion size t2 at which the lower portion of the supply-side reel 6 protrudes from the lower half 1 is set to be 1 / l of the meshing allowance t1 between the protrusion 8 of the supply-side reel 6 and the concave groove 3 of the lower half 1. A small tape cassette having a thick portion 4 for raising the lower half 1 in order to limit the value to 2 or less. [Effect] Projection dimension t2 of the supply side reel from the lower half
Since the magnetic tape is halved, it is possible to prevent unintentional slack of the magnetic tape and to simplify the shape of the insertion port of the small tape cassette dedicated deck, thus promoting the use of the small tape cassette.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a small tape cassette, particularly a VHS-C (registered trademark) tape cassette.

[0002]

[Prior Art]

 Japanese Patent Publication No. 60-44740 discloses a small tape cassette. This small tape cassette has a volume less than 1/3 of the standard tape cassette and was developed to be stored in a portable video camera. As shown in FIG. 8 of the publication, when a small tape cassette is reproduced by a standard reproduction deck, the small tape cassette A is stored in the adapter B, that is, the same shape as the standard tape cassette is reproduced. I am trying.

A conventional small tape cassette will be described with reference to the drawings. FIG. 6 is a perspective view of a conventional small-sized tape cassette. A small-sized tape cassette 100 has a supply reel 103 and a take-up reel 104 housed inside a housing formed by stacking an upper half 101 and a lower half 102. The magnetic tape 105 laid between the reels 103 and 104 is run to the front. Reference numeral 106 denotes a front cover, which is closed when not in use to protect the magnetic tape 105.

FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 6, in which the upper surface 103 a of the supply-side reel 103 is held down by the reel spring 107, and the ridges 103 b ... .. engage with the recessed grooves 102a ... Engraved in the half 102 to form an unused brake mechanism. The meshing allowance between the ridges 103b ... And the concave grooves 102a ... Is about 0.5 mm.

FIG. 8 is an operation diagram of the supply side reel of the conventional small tape cassette. When the small tape cassette 100 is set at a predetermined position of the reproduction deck, the supply side reel 103 of the small tape cassette 100 is relatively moved by the reel base 108. As a result, the ridges 103b ... Are separated from the concave grooves 102a ..., and the brake mechanism is opened.

[0006]

[Problems to be solved by the device]

 By the way, as shown in FIG. 7, the lower portion of the supply-side reel 103 of the small-sized tape cassette 100 projects from the lower surface of the lower half 102 by t0 when not in use. This t 0 is generally about 0.5 mm.

One of the reasons why the lower portion of the supply-side reel 103 is projected is that the bottom plate of the adapter B is approximately 1 mm thick, and the lower surface of the adapter B and the lower surface of the supply-side reel 103 are the same. This is to make the condition equal to that of the standard tape cassette.

Therefore, when the bare small-sized tape cassette 100 is placed on a desk or the like, the supply-side reel 103 is lifted up, the engagement margin between the ridges 103b ... And the groove 102a. There is.

Further, in recent years, a small tape cassette dedicated deck has been developed and put into practical use, but it is necessary to provide a notch portion at the cassette insertion port so that the lower part of the supply side reel is not caught. There are also aesthetic problems.

Therefore, an object of the present invention is to reduce the projecting size of the lower part of the supply reel while maintaining the braking effect.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is characterized in that a thick portion for raising the height is provided in the lower half, or the lower flange of the supply reel is increased in thickness.

[0012]

[Operation] By increasing the thickness of the thick part of the lower half or increasing the thickness of the lower flange of the supply reel, the supply reel relatively rises, and the projection size from the lower half of the supply reel is greatly reduced. To do.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial plan view of a lower half of a small tape cassette according to the present invention, in which a groove 3 is formed in a lower half 1 along a circular opening 2 in the same manner as in the prior art. However, it is characterized in that a thick-walled portion 4 (hereinafter abbreviated as "thick-walled portion 4") for raising is integrally formed in an annular shape so as to surround these concave grooves 3.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, in which the thick portion 4 is raised by s1 as compared with the normal bottom plate 5 of the lower half 1. On the upper surface of the thick portion 4, a flat portion 7 below the supply-side reel 6 shown by an imaginary line is placed.

In this embodiment, the meshing allowance t1 of the concave groove 3 is 0.5 mm, and the raised dimension s1 of the thick portion 4 is 0.3 mm. The operation of the supply reel of the small tape cassette having the above structure will be described below.

FIG. 3 is an operation diagram of the supply-side reel of the present invention. The operation of the thick portion 4 causes the supply-side reel 6 to be entirely raised by a dimension of s1 (0.3 mm). It is shown that the protruding dimension t2 from the lower surface of the lower half 1 is reduced to 0.2 mm.

In FIG. 3, since the meshing allowance t1 between the ridges 8 ... And the recessed grooves 3 ... Is 0.5 mm, the small tape cassette of the present invention is left bare on the desk, and the supply-side reels 6 are 0. Even if it is pushed up by 2 mm, the mesh size is reduced to 0.3 mm, but the breaking function can be sufficiently maintained.

Further, when the small tape cassette of the present invention is inserted into the small tape cassette deck, it has been found that the small tape cassette can be inserted with almost no catch even if there is no notch in the insertion opening. Therefore, according to the present invention, the shape of the insertion slot of the small tape cassette may be a simple rectangle.

In FIG. 3, if the meshing allowance t1 between the ridge 8 and the concave groove 3 is kept at 0.5 mm, the raised dimension s1 can be 0.45 mm and the protruding dimension t2 can be 0.05 mm. Is. That is, s1 may be determined so that the protrusion size t2 of the supply side reel is 1/2 or less of the meshing allowance t1.

In the above embodiment, the supply side reel 6 uses the current product (conventional product) and only the shape of the lower half 1 is changed. Next, as another embodiment, an example in which the lower half is the same as the current product and only the shape of the supply reel is changed will be described.

FIG. 4 is a cross-sectional view of a supply-side reel according to another embodiment of the present invention. The left half of FIG. 4 shows a current product (conventional product) for comparison, and the right half of the present embodiment. Indicates the item.

That is, the supply-side reel 10 according to the present embodiment is characterized in that the lower flange 11 is thickened downward by s2. The dimension s2 is 0.3 mm, for example.

FIG. 5 is an operation diagram according to another embodiment of the present invention. Since the distance between the lower surface of the supply reel 10 and the upper surface of the lower flange 11 is set to a constant value T by the standard, this supply Even when the side reel 10 is set in the conventional lower half 102, the projection size from the lower half is t3 (0.2 mm), which is the size s2 (0.3 mm) reduced, and the first embodiment described above is performed. It has the same effect as the example.

It should be noted that, by eclecticizing the first and second embodiments, a thick portion is provided on the lower half and the lower flange of the supply side reel is increased in thickness, and a combination of these is adopted from the lower half of the supply side reel. Of course, the protrusion size may be reduced.

[0026]

[Effect of the device]

 As described above, according to the present invention, in the small tape cassette, the projecting dimension of the supply reel from the lower half is halved, so that it is possible to prevent the unintentional slack of the magnetic tape from occurring and it is dedicated to the small tape cassette. The shape of the insertion slot of the deck can be simplified, and the use of small tape cassettes can be promoted.

[Brief description of drawings]

FIG. 1 is a partial plan view of a lower half of a small tape cassette according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an operation diagram of the supply reel of the present invention

FIG. 4 is a cross-sectional view of a supply reel according to another embodiment of the present invention.

FIG. 5 is an operation diagram according to another embodiment of the present invention.

FIG. 6 is a perspective view of a conventional small tape cassette.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is an operation diagram of a supply side reel of a conventional small tape set.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lower half, 3 ... Recessed groove, 4 ... Thick part, 6, 10 ... Supply side reel, 8 ... Convex strip, 11 ... Lower flange, s1 ... Raised dimension of thick part of lower half, s2 ... Supply reel Thickness increase of lower flange, t1 ... meshing allowance, t2, t3 ... protrusion size.

Claims (1)

[Scope of utility model registration request] 1. A small tape cassette that can be set on a standard tape cassette deck by mounting on an adapter, and can be set alone on a small tape cassette dedicated deck. In this small tape cassette, the lower part of the reel on the supply side projects from the lower half. In order to limit the protruding size to a value that does not exceed 1/2 of the meshing allowance between the convex strip of the supply reel and the concave groove of the lower half, a thick portion for raising the lower half is provided or A small tape cassette characterized by increasing the thickness of the lower flange.