JPH11328916A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette, a lid spring of which is not separated off from the proper mounting position, while the cost is low. SOLUTION: This purpose is resolved by providing such a magnetic tape cassette that the lid for covering the magnetic tape passing through an opening part so as freely to open/close, a lid lock for locking the lid to the closed state of the opening part and the lid spring 1 for pressing the lid to the closed state and pressing the lid lock to the closed state of the lid are furnished, and also therein, one leg part 5 of the lid spring 1 is engaged with the lid lock from the side of an upper half 11 for pressing to the closed state, and a tip part 5a of one leg part 5 of the lid spring 1 is formed to the linear state, and an engaging recessed part 18 in the drawn shape wherewith the tip part 5a is engaged, is arranged on the upper half 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic tape cassette suitable for a video tape cassette. More specifically, the present invention relates to a lid lock that locks a lid that covers an opening at the front end of a cassette case so as to be openable and closable, and a magnetic tape cassette that includes a lid and a lid spring that urges the lid lock to a closed state.

[0002]

2. Description of the Related Art There are various types of conventional magnetic tape cassettes. For example, a digital video cassette (D
VC) magnetic tape cassette. This DVC magnetic tape cassette is made of S, M and L according to its use.
There are cassettes and types.

FIG. 4 is an exploded perspective view of an S-type DVC magnetic tape cassette. As shown in FIG. 4, the magnetic tape cassette 40 includes a pair of reels 44, 4 each having upper and lower flanges in a lower half 42 forming a cassette case half.
5 is rotatably accommodated. And this reel 4
A magnetic tape (not shown) is wound around 4, 45.

Each of the reels 44, 45 has an upper flange 44.
a, 45a and lower flanges 44b, 45b. Engaging teeth are formed on the entire periphery of the lower flanges 44b, 45b. And the reels 44 and 45
Is biased toward the lower half 42 by the reel springs 47 and 48. The magnetic tape is located at the front of the cassette (FIG. 4).
Tape guides 42a, 42 on both the left and right sides.
2b, and passes through the opening 49 on the front side of the lower half 42.

A lid 50 for covering a magnetic tape passing through an opening 49 at the front end of the cassette is provided on the upper half 41 as the other half forming a cassette case together with the lower half 42.
Is attached to open and close freely. This lid 50
It is composed of three members: an outer lid 51, a top lid 52, and an inner lid 53.

[0006] One side plate 5 of the outer lid 51
A lock projection 63 is provided on the inner side of 5. A lid lock 59 that locks the lock projection 63 and locks the lid 50 in the closed state of the opening 49 is rotatably attached to the side plate portion 57 of the lower half 42.

FIG. 5A is a top view of the side plate 55 of the outer lid 51, and FIG.
A side view of one side plate 55 is shown. 4 and 5 (a),
As shown in (b), a lid spring 71 is mounted on the side plate 55 of the outer lid 51. The lid spring 71 has a coil portion 72 attached to the pin 61 of the side plate 55, one leg portion 73 is engaged with a first projection 65 provided on the side plate 55 of the outer lid 51, and the other leg portion 75.
Are provided on the side plate 55 and the second protrusion 67 and the upper half 3
The first lock 1 is locked by a projection (not shown) provided at the front end thereof, and engages with the lid lock 59 from the upper half 41 side to urge the lid lock 59 to the closed state. Further, the lid spring 71 has a function of urging the lid 50 to a closed state.

[0008]

Since the leg 75 of the lid spring 71 must urge the lid lock 59 with a predetermined urging force, the leg 75 is pressed against the lid lock 59. It must be held in the proper position. Therefore, conventionally, by bending the tip portion 75b of the leg portion 75, the tip portion 75b is engaged with a concave portion (not shown) provided in the upper half 41, and the leg portion 75 of the lid spring 71 is properly positioned. Was holding on to. However, since the lid spring 71 is a small part (the total length of the lid spring used in the S-type cassette is about 15 mm), it takes time and cost to machine the engaging end portion 75a.

Further, as shown in FIGS. 5 (a) and 5 (b), the legs 73, 75 of the lid spring 72 are engaged with the projections 65, 67 of the side plate 55 of the outer lid 51, respectively. In FIG. 5B, the projections 65 and 67
In some cases, an upward force was applied, and the coil portion 72 of the lid spring 71 was inclined from an appropriate position.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic tape cassette which is inexpensive but does not separate a lid spring from a proper mounting position.

[0011]

According to a first aspect of the present invention, there is provided a magnetic tape cassette comprising upper and lower halves, a cassette case having an opening at a front end, and a rotatable magnetic tape wound in the cassette case. A reel that covers the magnetic tape that passes through the opening,
A lid lock for locking the lid in a closed state of the opening, and a lid spring for urging the lid to a closed state and urging the lid lock to a closed state of the lid; In a magnetic tape cassette in which one leg engages with the lid lock from the upper half side and urges the lid lock to the closed state, the one leg of the lid spring has a linear end portion, and The half is provided with a throttle-shaped engaging recess with which the tip engages.

According to the first aspect of the present invention, the linearly shaped tip of the leg of the lid spring is guided from the entrance of the engagement recess by the throttle-shaped engagement recess provided in the upper half. The legs of the lid spring are engaged and the position is regulated. Therefore, only by providing a drawing-shaped engaging concave portion in the upper half without processing the tip portion of the lid spring, which is troublesome and costly to process, the lid spring does not detach from the proper mounting position, so while being inexpensive, Reliable lid lock can be guaranteed.

According to a second aspect of the present invention, there is provided a magnetic tape cassette comprising upper and lower halves having an opening at a front end, a reel rotatably housed in the cassette case and winding a magnetic tape, and A lid for opening and closing the magnetic tape passing through the opening; a lid lock for locking the lid in a closed state of the opening; a lid for urging the lid to a closed state and closing the lid lock to a closed state of the lid; And a coil spring is mounted on a pin provided perpendicular to the side plate of the lid, and one of the legs is engaged with a projection of the side plate of the lid. A magnetic tape cassette in which the other leg is engaged with the projection of the side plate of the lid and the upper half, and engages with the lid lock from the upper half side to urge the lid to a closed state; The one leg portion of the lid spring is provided with an L-shaped portion whose tip is bent in parallel with the center line of the coil portion, and the side plate of the lid includes the L-shaped portion. And a projection perpendicular to the side plate for restricting the position of the side plate so as to be parallel to the pin.

According to the second aspect of the present invention, the protrusion perpendicular to the side plate of the lid regulates the position of the L-shaped portion provided on one leg of the lid spring so as to be parallel to the pin of the side plate of the lid. Is maintained at an appropriate mounting position with respect to the pin. Therefore, since the lid spring does not come off from the proper mounting position only by providing the protrusion on the side plate of the lid, a reliable lid lock can be guaranteed at low cost.

[0015]

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 shown in FIGS. 4 and 5 are denoted by the same reference numerals and described. FIG. 1A is a top view of a lid spring 1 according to one embodiment of the present invention, and FIG.
FIG. 2B is a side view of the lid spring 1.

A magnetic tape cassette according to the present invention also comprises, similarly to the conventional case, a cassette case having upper and lower halves and having an opening at a front end, and a reel rotatably housed in the cassette case and winding a magnetic tape. A lid for opening and closing the magnetic tape passing through the opening, and a lid lock for locking the lid in a closed state of the opening.

Further, as shown in FIGS. 1 (a) and 1 (b), in the lid spring 1 of the present invention, the coil portion 2 is mounted on a pin 31 of a side plate 25 of an outer lid 21 which will be described later. 3 is locked to a first protrusion 35 provided on the side plate 25, and the other leg 5 is provided on a second protrusion 37 provided on the side plate 25 and a locking protrusion provided on a front end of the upper half 11, which will be described later. Locked by the portion 13, the lid lock 49 is engaged from the upper half 11 side to urge the lid lock 49 to the closed state.

As a characteristic configuration of the present invention, an L-shaped portion 3a bent parallel to the center line of the coil portion 2 is formed at the tip of the one leg 3, and the tip of the other leg 5 is formed. Part 5
a is formed linearly. The L-shaped portion 3a can also be used as a parts feeder for gripping the lid spring 1. The lid spring 1 also has a function of urging the lid composed of the three members of the outer lid 21, the top lid 52 and the inner lid 53 to a closed state.

FIG. 2A is a partially enlarged inner view of the upper half 11, and FIG. 2B is a sectional view taken along line AA of FIG.
As shown in FIG. 2A, an engagement recess 18 is provided in the side plate 17 of the lower half 11. As shown in FIG. 2B, the engaging recess 18 is formed as an outwardly expanding space. That is, the entrance 18a of the engagement recess 18 is slightly wider, and has a narrowed shape in which the width decreases toward the bottom of the engagement recess 18.

Here, the linear tip portion 5a of the leg portion 5 of the lid spring 1 is guided by the inlet 18a and engages near the bottom of the engaging concave portion 18, thereby forming the leg portion 5 of the lid spring 1. Is regulated. Therefore, the position of the lid spring 1 is restricted by providing the engagement recess 18 having a drawn shape in the upper half 11 without processing the distal end portion 5a of the lid spring 1 which is troublesome and costly in processing. Because it does not come off from a suitable mounting position, it is inexpensive,
Reliable lid lock can be guaranteed.

FIG. 3A is a top view of the side plate 25 of the outer lid 21, and FIG.
The side view of the side plate 25 of FIG. As shown in FIGS. 3A and 3B, the side plate 25 of the outer lid 21 is provided with a first protrusion 35 having an L-shaped cross section for locking one leg 3 of the lid spring 1. I have. Therefore, when the lid spring 1 is assembled to the side plate 25 of the outer lid 21, the first protrusion 35 causes the L-shaped portion 3 a bent in parallel with the center line of the coil portion 2 to the side plate 25 of the outer lid 21. The position is regulated so as to be parallel to the pin 31, and the coil portion 2 of the lid spring 1 is kept at a proper mounting position with respect to the pin 31. Therefore, only by providing the protrusion 35 on the side plate 25 of the lid 21, the position of the lid spring 1 is regulated, and the lid spring 1 does not come off from the proper mounting position.
Reliable lid lock can be guaranteed.

The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiment, and can be appropriately changed and improved based on the spirit of the present invention. For example, the magnetic tape cassette of the present invention is not limited to DVC, but can be applied to various cassettes having a lid spring. Also, the open / close lid is not limited to the three-lid type,
It may be a two-lid open / close lid.

[0023]

According to the first aspect of the present invention, one of the legs of the lid spring has a straight tip portion, and the upper half has a throttle-shaped engaging recess with which the tip portion engages. Is provided. Therefore, only by providing a drawing-shaped engaging concave portion in the upper half without processing the tip portion of the lid spring, which is troublesome and costly to process, the lid spring does not detach from the proper mounting position, so while being inexpensive, Reliable lid lock can be guaranteed. According to the second aspect of the present invention, one leg portion of the lid spring is provided with an L-shaped portion whose tip is bent in parallel with the center line of the coil portion, and the L-shaped portion is provided on a side plate of the lid. A projection perpendicular to the side plate for regulating the position of the portion so as to be parallel to the pin is provided. Therefore, since the lid spring does not come off from the proper mounting position only by providing the projection on the side plate of the lid,
An inexpensive yet reliable lid lock can be guaranteed.

[Brief description of the drawings]

FIG. 1A is a top view of a lid spring according to an embodiment of the present invention, and FIG. 1B is a side view of the lid spring 1. FIG.

FIG. 2 (a) is a partially enlarged inner view of the upper half,
(B) is AA sectional drawing of (a).

FIG. 3A is a top view of a side plate of the outer lid, and FIG. 3B is a side view of a side plate of the outer lid.

FIG. 4 is an exploded perspective view of a conventional S-type DVC magnetic tape cassette.

FIG. 5A is a top view of a side plate of a conventional outer lid, and FIG. 5B is a side view of a side plate of a conventional outer lid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid spring 2 Coil part 3 Leg part 3a L-shaped part 5 Leg part 5a Tip part 11 Upper half 13 Engagement projection part 17 Side plate part 18 Engagement concave part 18a Entrance 21 Outer lid 25 Side plate 31 Pin 35 First projection 37 First 2 Projection 41 Upper half 42 Lower half 44, 45 Reel 49 Opening 50 Lid 51 Outer lid 52 Top lid 53 Inner lid 59 Lid lock

Claims (2)

[Claims] 1. A cassette case comprising upper and lower halves and having an opening at a front end, a reel rotatably housed in the cassette case and winding a magnetic tape, and the magnetic tape passing through the opening A lid for opening and closing the lid, a lid lock for locking the lid in a closed state of the opening, and a lid spring for urging the lid to a closed state and urging the lid lock to a closed state of the lid. And one of the legs of the lid spring,
In the magnetic tape cassette which engages with the lid lock from the upper half side and urges the lid lock to a closed state, the one leg portion of the lid spring has a linear tip, and the upper half has the tip portion. A magnetic tape cassette provided with a throttle-shaped engaging recess for engaging with the magnetic tape cassette. 2. A cassette case comprising upper and lower halves and having an opening at a front end, a reel rotatably housed in the cassette case and winding a magnetic tape, and the magnetic tape passing through the opening. A lid for opening and closing the lid, a lid lock for locking the lid in a closed state of the opening, and a lid spring for urging the lid to a closed state and urging the lid lock to a closed state of the lid. The lid spring has a coil portion mounted on a pin provided perpendicular to a side plate of the lid, one leg portion is locked to a projection of the side plate of the lid, and the other leg portion is A magnetic tape cassette locked to the projection on the side plate of the lid and the upper half and engaged with the lid lock from the upper half side to urge the lid lock to a closed state; The other leg is provided with an L-shaped portion whose tip is bent in parallel with the center line of the coil portion, and the side plate of the lid is configured such that the L-shaped portion is parallel to the pin. A magnetic tape cassette provided with a protrusion perpendicular to the side plate for position regulation.