JPH10302437A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten screws stably of the upper cassette half and the outer lid without damaging them by providing on the outer lid a rib that comes into contact with the face on the side oppositely facing the outer lid of a hole for screwing the upper cassette half at the time of closing the lid. SOLUTION: A pair of ribs 9e is provided inside the outer lid 9. The rib 9e has an inclined face such that it comes into contact, at the time of closing the lid, with an inclined face on the side oppositely facing the outer lid 9 of the hole for screwing where a projection 47a of the upper cassette half 32 is structured. A pressurizing force acts when the upper cassette half is fastened with a screw 55a; however, the inclined face of the front end 32a of the upper cassette half 32 comes into contact with the rib 9e, which functions as a stopper, so that the projection 47a which is the hole for screwing is free from displacement in the pressurizing direction. As a result, the upper and lower cassette halves 32, 33 can be stably fastened with screws without damaging the upper cassette half 32 and the outer lid 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette having upper and lower cassette halves and an opening / closing lid.

[0002]

2. Description of the Related Art Along with recent technical innovations due to the increase in density of magnetic recording media, magnetic tape cassettes, video tape recorders (hereinafter, referred to as VTRs) and the like have become smaller. As a result, VTRs are very often used outdoors, such as when shooting landscapes or people.

For this reason, in consideration of outdoor use and the like, a two- or three-sheet lid for covering the entire surface and the back surface of the magnetic tape has been put into practical use as a measure against dust and dirt in consideration of outdoor use and the like.

FIG. 6 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 device side such as a VTR on the front surface, and is provided on the front surface of the cassette body composed of the upper cassette half 32 and the lower cassette half 33, and the front surface of the cassette body. The cassette tape has a configuration including a magnetic tape (not shown) stretched over the opening 31 by the tape guide, and an opening / closing lid 34 attached to the front side of the cassette main body so as to cover the magnetic tape. 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 between the reels 35 and 36 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 the cassette is stored or carried. 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.

[0007] 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. FIG.
7A is a side view of the upper cassette half 32, and FIG.
FIG. As shown in FIGS. 7A and 7B, the upper cassette half 32 has a protrusion 47 on the front end side.
a, 47b, projections 48a, 48b on the rear end side, and a projection 49 substantially in the center, and each projection constitutes a screw hole. The projections 47a and 47b forming the screw holes on the front end side project from the front end side of the upper cassette half 32.

FIG. 8A shows a side view of the lower cassette half 33, and FIG. 8B shows a bottom view thereof. FIG. 8 (a),
As shown in (b), the lower cassette half 33 has holes 50a, 50b at the front end and 51a, 51b at the rear end.
However, a hole 52 is provided substantially at the center, and each hole forms a screwing portion.

Each of the projections 4 of the upper cassette half 32
7a, 47b, 48a, 48b, 49 are holes 50a, 50b, 51a, 51b, 52 of the lower cassette half 33.
After the opening / closing lid 34 is assembled, the screws 55a
55e.

When assembling the magnetic tape cassette 30 having such a three-lid type opening / closing lid 34, the outer lid 19, the top lid 20 and the inner lid 21 are temporarily assembled in advance. Thereafter, while the upper lid slide pin 20d of the top lid 20 is fitted into the upper lid guide groove 45 provided in the upper cassette half 32,
The three lids 19, 20, and 21 are placed in the upper cassette half 32.
To be assembled. Next, the upper cassette half 32
Assembling the lower cassette half 33 with the projection 47
a, 47b, 48a, 48b, 49 and the holes 50a, 50b, 51a, 51b, 52 of the lower cassette half 33 are screwed with screws 55a to 55e, so that the upper cassette half 32 and the lower cassette half 33 Perform final assembly.

[0011]

However, in a magnetic tape cassette in which the lid is composed of three lids, as shown in FIG. 7 (a), there is no obstacle in the trajectory when the lid is opened and closed. The upper cassette half 32 has a front end portion 32a that is thin,
The positions of a and 47b are the front end 32 of the upper half cassette 32.
It has a shape protruding from a. Therefore, FIG.
Finally, as shown in FIG.
When the second cassette half 33 is screwed into the second cassette half 33, the pressing force of the screw 55a causes the protrusion 47a, which is a hole for screwing, to be displaced in the pressing direction (FIG. 9B). As a result, the front end 32a of the upper cassette half 32 may bend, and the upper cassette half 32 and the outer lid 19 may be damaged. The present invention has been made in view of the above problems, and has as its object to stably screw the upper cassette half and the outer lid without damaging them.

[0012]

SUMMARY OF THE INVENTION The above objects are attained by an upper and lower cassette half screwed to each other by screwing, an opening / closing lid comprising an outer lid, a top lid and an inner lid, and a front end side of the upper cassette half. A magnetic tape cassette having a screw hole for screwing the upper and lower cassette halves projecting to a position close to the outer lid when the lid is closed, wherein the upper cassette half is screwed when the lid is closed. The problem is solved by providing a magnetic tape cassette, wherein a rib that contacts a surface of the hole portion facing the outer lid is provided on the outer lid.

According to the present invention, the surface of the upper cassette half constituting the magnetic tape cassette on the side facing the outer lid of the screw fixing hole comes into contact with the rib of the outer lid when the lid is closed. Even if a pressing force is applied at the time of attachment, the screw hole does not displace in the pressing direction. That is,
The rib provided on the outer lid functions as a stopper. Therefore, when the upper and lower cassette halves are screwed with screws, the upper cassette halves and the outer lid can be stably screwed without damaging the upper cassette half and the outer lid even if a pressing force is applied by the screws.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The same components as those of the conventional magnetic tape cassette will be described with the same reference numerals. FIG. 1 shows an assembled perspective view of a magnetic tape cassette 1 according to one embodiment of the present invention. As shown in FIG. 1, a magnetic tape cassette 1 has a cassette body 4 having an opening 2 for inserting a tape pull-out member on the apparatus side such as a VTR on the front surface, and a tape guide attached to the front surface of the cassette body 4. And a cover 7 attached to the front side of the cassette body 4 so as to cover the magnetic tape stretched in the opening 2 when carrying the portable device or the like. No.

The cassette body 4 includes an upper cassette half 32
And a lower cassette half 33. The opening / closing lid 7 includes three lids, an outer lid (front lid) 9, a top lid (upper lid) 10, and an inner lid (rear lid) 11.

The outer lid 9 includes a front cover plate 9a for covering the front side of the magnetic tape 5 stretched over the opening 2, and a front cover plate 9a.
a and side plate portions 9b projecting from both sides. A support pin 9c is projected from an inner wall surface of the side plate portion 9b, and the support pin 9c is rotatably fitted and supported in pin support holes 46 on both side surfaces near the front surface of the upper cassette half 32. You. As shown in FIG. 2, a hole 9d is formed in the pair of side plates 9b of the outer lid.

As shown in FIG. 2, the top lid 10 is
An upper lid plate 10a for covering the upper side of the magnetic tape 5 stretched over the opening 2, a front lid support pin 10b for rotatably connecting both ends on the front edge side of the upper lid plate 10a to holes 9d of the side plate portion 9b; An upper cover slide pin 10d projecting from an arm portion 10c extending from a rear edge of the upper cover plate 10a and slidably engaging with an upper cover guide groove 45 formed on both side surfaces of the upper cassette half 32; It has.

As shown in FIG. 2, the inner lid 11
Is an inner lid plate 11a covering the rear side of the magnetic tape 5 stretched over the opening, an upper lid connecting portion 11b for rotatably connecting the upper edge of the inner lid plate 11a to the upper lid plate 10a, An inner lid slide pin 11c protruding from both lower end portions of the lower edge 11a and engaging with an inner lid guide groove 15 formed on the inner side surface of the cassette body 4 is provided.

FIG. 3 is a rear view of the outer lid 9, and FIG.
3 shows a cross-sectional view along the BB cross section of FIG. As shown in FIGS. 3 and 4, a pair of ribs 9 e are provided inside a hole 9 d provided in the pair of side plates 9 b of the outer lid 9. The pair of ribs 9e have inclined surfaces so as to come into contact with the inclined surface on the side facing the outer lid 9 of the screw hole formed with the projections 47a and 47b of the upper cassette half 32 when the lid is closed. Have.

Hereinafter, an assembling method according to an embodiment of the present invention will be described. As in the conventional case, when assembling the magnetic tape cassette 1 having the three-lid type opening / closing lid 7, the outer lid 9, the top lid 10, and the inner lid 11 are temporarily assembled in advance. Thereafter, the three lids 9, 10, 11 are attached to the upper cassette half 3 while the upper lid slide pins 10d of the top lid 10 are fitted into the upper lid guide grooves 45 provided in the upper cassette half 4a.
2 and assembled. Next, upper cassette half 3
Assembling of the lower cassette half 33 with the protrusions 47
a, 47b, 48a, 48b, 49 and the holes 50a, 50b, 51a, 51b, 52 of the lower cassette half 33 are screwed with screws 55a to 55e, so that the upper cassette half 32 and the lower cassette half 33 Final assembly is performed (FIG. 5).

As shown in FIG. 5, when the screw is screwed with the screw 55a, a pressing force acts. However, since the outer lid 9 is provided with the rib 9e having an inclined surface, the front end 32a of the upper cassette half 32 is provided. Is in contact with the rib 9e. That is, the rib 9e provided on the outer lid 9
Function as a stopper, the projection 47a, which is a screw hole, does not displace in the pressing direction even if a pressing force is applied when the screw is tightened. Therefore, when screwing the upper and lower cassette halves with screws, the upper cassette half 32 and the outer lid 9 can be stably screwed without being damaged.

In this embodiment, the rib 9e is
Holes 47a, 47 for screwing the upper cassette half 32
Although the shape is in surface contact with the inclined surface of the front end portion 32a provided on the back side of b, it may be in a shape of point contact or line contact.

[0023]

As described above, according to the present invention, when the lid is closed, the rib that comes into contact with the surface of the screw hole of the upper cassette half that faces the outer lid is provided on the outer lid. The rib functions as a stopper even if a pressing force acts on the screw, and the screw hole does not move in the pressing direction. Therefore, when screwing the upper and lower cassette halves with screws, the upper cassette halves and the outer lid can be stably screwed without being damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembled state of a three-lid magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a state where a lid of the magnetic tape cassette shown in FIG. 1 is closed.

FIG. 3 is a rear view of the outer lid according to the embodiment of the present invention.

FIG. 4 is a sectional view of the outer lid taken along the line BB of FIG. 3;

FIG. 5 shows an assembling method according to an embodiment of the present invention.

FIG. 6 is an exploded perspective view of a conventional magnetic tape cassette.

7A is a side view of the upper cassette half of the magnetic tape cassette according to the present invention, and FIG. 7B is a bottom view thereof.

8A is a side view of the lower cassette half of the magnetic tape cassette according to the present invention, and FIG. 8B is a bottom view thereof.

FIG. 9 shows a conventional method of assembling a magnetic tape cassette,
(A) shows a state before the upper and lower cassette halves are screwed, and (b) shows a state where the upper cassette half is deformed during the screwing operation.

DESCRIPTION OF SYMBOLS 1 Magnetic tape cassette 2 Opening 4 Cassette body 5 Magnetic tape 7 Opening / closing lid 9 Outer lid 9a Front lid plate 9b Side plate 9c Support pin 10 Top lid 10a Upper lid plate 10b Front lid connecting part 10c Arm part 10d Upper lid slide pin 11 Inner lid 11a Inner lid plate 11b Connecting part 11c Inner lid slide pin 13 Upper lid guide groove 15 Inner lid guide groove 30 Magnetic tape cassette 31 Opening 32 Upper cassette half 32a Front end 33 Lower cassette half 34 Opening / closing lid 35 , 36 Reel 37, 38 Tape guide 39, 40 Engagement tooth 41 Slide member 42, 43 Reel brake 44 Spring 45 Upper lid guide groove 46 Pin support hole 47a, 47b Projection 47c, 47d Locking portion 48a, 48b Projection 49 Projection Parts 50a, 50b Holes 50a, 50b Locked portion 51a, 51b Hole 52 Hole 55a to 55e Screw 56 Inner lid guide groove

Claims (1)

[Claims] 1. An upper / lower cassette half screwed to each other by screwing, an opening / closing lid comprising an outer lid, a top lid and an inner lid; and a front end side of the upper cassette half, wherein the outer lid is closed when the lid is closed. A magnetic tape cassette having a screw hole for screwing the upper and lower cassette halves protruding to an adjacent position, wherein the upper cassette half faces the outer lid of the screw hole for screwing when the lid is closed. A rib that abuts a surface on the side of the magnetic tape cassette provided on the outer lid.