JPH1125640A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a dimension reference hole serve as a reference for assembling a magnetic tape cassette by providing the dimension reference hole made of a through-hole in the position an upper cassette half opposite the dimension reference hole of a lower cassette half. SOLUTION: An upper cassette half 2 includes dimension reference holes 6a and 6b made of through-holes provided in positions opposite the dimension reference holes 51a and 51b of a lower cassette half in its front face side. Since the dimension reference holes 6a and 6b are made of through-holes, these are visible from the front and backsides of a magnetic tape cassette 1. Thus, the dimension reference holes 6a and 6b are used as references for the optical or mechanical measuring method of a display part 2a for identifying the kind of a tape, a label part 2b for sticking a label and a transparent part 2c for identifying a tape remaining amount, which are provided in the front and backsides of the upper cassette half 2. For example, the dimension of the rear side of the upper cassette half 2 of the label part 2a is measured as the position of a distance (d) from the dimension reference hole 6a by the optical measuring method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic tape cassette provided with upper and lower cassette halves.

[0002]

2. Description of the Related Art FIG. 3 is an exploded perspective view of a conventional magnetic tape cassette 30 for a DVC (digital video cassette). The magnetic tape cassette 30 has an opening 31 for inserting a tape pull-out member on the apparatus side such as a VTR on the front surface,
A cassette body composed of an upper cassette half 32 and a lower cassette half 33, a magnetic tape (not shown) stretched over the opening 31 by a tape guide provided on the front surface of the cassette body, and the magnetic tape are covered. Thus, the opening / closing lid 34 assembled on the front side of the cassette body is provided. The opening / closing lid 34 is composed of three lids: an outer lid (front lid) 19, a top lid (upper lid) 20, and an inner lid (rear lid) 21.

In the lower cassette half 33, a pair of reels 3
5 and 36 are rotatably arranged.
6, a magnetic tape (not shown) is wound. The magnetic tape is a tape guide 3 in front of the cassette and on both the left and right sides.
7 and 38, and passes through the opening 31 on the front side of the lower cassette half 33. And
On the peripheral edges of the reels 35 and 36, the engaging teeth 3
9, 40 are formed.

The magnetic tape cassette 30 is provided at the rear of the cassette and between the reels 35 and 36 in order to prevent the magnetic tape from being loosened when not loaded in a device such as a VTR, that is, when storing or carrying the cassette. A slide member 4 forming a lock device for locking the rotation of the reels 35 and 36 in the substantially triangular space formed in
1. Reel brakes 42 and 43, which are engaging claws, and a brake spring 44 for urging the reel brakes are arranged.

[0005] The upper cassette half 32 is provided with an upper lid guide groove 45 and a pin support hole 46. The upper lid slide pin 20 d slides in the upper lid guide groove 45. The pivot pin 19c of the outer lid 19 is rotatably fitted and supported in the pin support hole 46. On the front side of the upper cassette half 32, there are provided a display unit 32a for checking the type of tape, a label unit 32b for attaching a label, and a transparent unit 32c for grasping the remaining amount of the tape.

FIG. 4A shows a side view of the lower cassette half 33, and FIG. 4B shows a top view thereof. FIG. 4 (a),
As shown in (b), the lower cassette half 33 has holes 48a and 48b on the front end side and holes 49a and 49b on the rear end side.
As for b, a hole 50 is provided substantially at the center, and each hole forms a screwing portion. Further, two dimension reference holes 51a and 51b defined by standards are provided on the front side of the lower cassette half 33. Each of the dimension reference holes 51a and 51b is a through hole and serves as a reference for the outer dimensions of the lower cassette half 33 and the positions of the reel holes 33a and 33b provided in the lower cassette half 33, and is mainly formed by an optical method. The outer dimensions and the like are determined by the reference holes 5.
It is measured with reference to 1a and 51b.

FIG. 5A shows a side view of the upper cassette half 32, and FIG. 5B shows a bottom view thereof. FIG. 5 (a),
As shown in (b), the upper cassette half 32 has protrusions 52a, 52b at the front end and protrusions 53a, 53 at the rear end.
3b, a projection 54 is provided substantially at the center, and each projection constitutes a screw hole. Further, protrusions 55a and 55b are provided at positions in front of the upper cassette half 32 and opposed to the dimension reference holes 51a and 51b of the lower cassette half 33. In the upper cassette half 32, since there is no standard of the dimensions, conventionally, the projections 55a and 55b are provided with a concave portion as a mark for visual recognition, so that the upper cassette half 32 is used as a substantial size standard. .

[0008]

By the way, the protrusion 55
The concave portions a and 55b are provided on the back side of the upper cassette half 32, that is, on the side where the ribs and the like are provided, for detecting the position of the ribs and the like on the back side of the upper cassette half 32. Therefore, when the display portion 32a is provided on the front side of the upper cassette half 32, or when the label portion 32b, the transparent portion 32c, or the like is provided, the reference cannot be made.
In addition, in the assembly process where automation is desired in recent years, the concave portions provided on the respective projections 55a and 55b are provided on the back side of the upper cassette half 32, so that the upper cassette half 32 side to the lower cassette half 33 side are provided. When facing, the dimension reference holes 51a, 51b of the lower cassette half 33
Could not be seen, and could not be used as a reference when assembling the magnetic tape cassette. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a magnetic tape cassette that can serve as a dimensional reference for the upper cassette half itself and that can improve the assemblability of the magnetic tape cassette. is there.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to store a magnetic tape movably in upper and lower cassette halves,
In a magnetic tape cassette having a size reference hole on the front side of the lower cassette half, a size reference hole formed of a through hole is provided at a position facing the reference hole of the lower cassette half of the upper cassette half. The feature is solved by a magnetic tape cassette.

According to the present invention, a size reference hole formed of a through hole is provided at a position facing the size reference hole of the lower cassette half of the upper cassette half, and the size reference hole of the upper cassette half is connected to the upper cassette half. It functions as a standard for the dimensions of the half itself and also as a standard for assembling the magnetic tape cassette. Therefore, since there is a dimension reference hole formed of a through hole not only in the lower cassette half but also in the upper cassette half, it can be visually recognized from the front and back of the magnetic tape cassette, and the display portion and the like on the front side and the back side of the upper cassette half. Etc. can be accurately measured. Further, the dimension reference hole formed of the through hole functions as a reference when assembling the magnetic tape cassette, so that the assemblability of the magnetic tape cassette is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a top view of an upper cassette half according to an embodiment of the present invention.
(B) is a method for assembling a magnetic tape cassette according to one embodiment of the present invention. In the embodiments described below, the same components as those in the conventional example are denoted by the same reference numerals in the drawings, and the description thereof will be simplified or omitted.

As shown in FIG. 1, the upper cassette half 2 of the magnetic tape cassette 1 according to one embodiment of the present invention faces the dimension reference holes 51a, 51b of the lower cassette half 33 on the front side of the upper cassette half 2. Dimension reference holes 6a and 6b formed of through holes are provided at positions. Size reference hole 6
Since a and 6b are constituted by through holes, they are visible from the front and back of the magnetic tape cassette 1. Therefore, the dimension reference holes 6a and 6b are provided on the display side 2a for checking the type of tape of the upper cassette half 2 provided on the front side of the upper cassette half 2, the label section 2b for attaching a label, and the remaining amount of tape. The reference can be made by an optical or mechanical measurement method of the transparent portion 2c for performing the measurement. For example, the dimension on the rear side of the upper cassette half 2 of the label portion 2d can be measured by an optical measuring method as a position at a distance d from the dimension reference hole 6a. Further, since the dimension reference holes 6a and 6b can be used as a reference for the outer dimensions of the upper cassette half 2 as in the related art, the precision in forming the magnetic tape can be improved.

Next, a method of assembling the magnetic tape cassette 1 according to one embodiment of the present invention will be described. As shown in FIG. 2A, first, the lower cassette half 33 is placed. Then, the components such as the magnetic tape reels 35 and 36 are transferred to the lower cassette half 3
2, as shown in FIG. 2B, the lower cassette half 33 is assembled such that the dimension reference holes 6 a and 6 b of the upper cassette half 2 coincide with the size reference holes 51 a and 51 b of the lower cassette half 33. After passing through an assembling process such as attaching an opening / closing lid, the assembling is completed. In order to align the size reference holes, the upper and lower cassette halves are combined by, for example, inserting a pin into the size reference holes.

That is, according to the above configuration, since the dimension reference holes 6a and 6b of the upper cassette half 2 are formed of through holes,
When assembling the upper cassette half 2 to the lower cassette half 33, the lower cassette half 3
3 when facing the size reference hole 51a of the lower cassette half,
The assembly position can be visually confirmed with reference to 51b. Therefore, the assemblability of the magnetic tape cassette is improved.

The size reference hole of the upper cassette half of the present invention is not limited to the above-described embodiment, but can be appropriately modified and improved. For example, the diameter may be the same as the dimension reference hole of the lower cassette half. At this time, the upper and lower cassette halves can be positioned by mechanical means. The magnetic tape cassette of the present invention is a DV cassette.
The present invention is not limited to C, and can be applied to various types of cassettes.

[0016]

As described above, according to the present invention, the upper cassette half is provided with a dimensional reference hole formed of a through hole at a position facing the dimensional reference hole of the lower cassette half. The dimension reference hole of the half functions not only as a dimension reference for the upper cassette half itself but also as a reference when assembling the magnetic tape cassette. Therefore, since there is a dimension reference hole formed of a through hole not only in the lower cassette half but also in the upper cassette half, it can be visually recognized from the front and back of the magnetic tape cassette, and the display portion and the like on the front side and the back side of the upper cassette half. Etc. can be accurately measured. Further, the dimension reference hole formed of the through hole functions as a reference when assembling the magnetic tape cassette, so that the assemblability of the magnetic tape cassette is improved.

[Brief description of the drawings]

FIG. 1 shows a top view of an upper cassette half according to an embodiment of the present invention.

FIGS. 2A and 2B show a method of assembling a magnetic tape cassette according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a conventional magnetic tape cassette.

4A is a side view of a conventional lower cassette half, and FIG. 4B is a top view thereof.

5A is a side view of a conventional upper cassette half, and FIG. 5B is a bottom view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape cassette 2 Upper cassette half 2a Display part 2b Label part 2c Transparent part 6a, 6b Reference hole 19 Outer lid 19c Spindle pin 20 Top lid 20d Top lid guide groove 21 Inner lid 30 Magnetic tape cassette 31 Opening 32 Upper cassette half 32a display section 32b label section 32c transparent section 33 lower cassette half 34 opening / closing lid 35, 36 reel 37, 38 tape guide 39, 40 engaging teeth 41 sliding member 42, 43 reel brake 44 reel brake spring 45 upper lid guide groove 46 pin support Hole 48a, 48b Hole 49a, 49b Hole 50 Hole 51a, 51b Reference hole 52a, 52b Projection 53a, 53b Projection 54 Projection 55a, 55b Projection

Claims (1)

[Claims] 1. A magnetic tape cassette containing a magnetic tape movably accommodated in upper and lower cassette halves and having a dimension reference hole in front of the lower cassette half, wherein the reference hole of the lower cassette half of the upper cassette half is provided. A magnetic tape cassette provided with a dimension reference hole formed of a through hole at a position facing the magnetic tape cassette.