JPH04153971A - Tape cassette - Google Patents

Abstract

PURPOSE:To accurately perform the positioning against both shells of a slider by turning the form of the slider for erroneous deletion prevention to be point symmetry and providing a click stopper means for positioning respectively between this slider and each upper and lower shell. CONSTITUTION:A pair of projections 34a and 34b of a slider 32, projections 35a and 35b, projections 33a and 33b in a hole 31, and stage parts 36a and 36b are point symmetrically formed above and below. When the slider 32 slides on a lower shell 3, the projection 34a comes into contact with the lower side of the projection 33a, the projection 35a is struck with the stage part 36a. When the slider 32 slides on an upper shell 2, the projection 34b comes into contact with the upper side of the projection 33b, the projection 35b is struck with the stage part 36b, and the slider 32 is restraint. When the slider 32 slides on the upper shell 2, it is restraint by the projection 33b and the stage part 36b. When it slides on the lower shell 3, it is restraint by the projection 33a and the stage part 36a. Thus, positioning is accurately performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape cassette for recording and reproducing PCM signals in a very small size, for example, about 30 mm in width, about 20 mm in length, and about 5 mm in thickness.

[Summary of the Invention] The present invention relates to a tape cassette, in which the shape of a slider for preventing accidental erasing is made point symmetrical, and a positioning clink stopper means is provided between the slider and each of the amber shell and the lower shell. By providing this, it is possible to precisely position the slider with respect to both shells.

Furthermore, by forming the positioning click stopper means into a surface having an asymmetrical arc, positioning clicks can be performed satisfactorily.

[Prior art] For example, the width is about 3 On+m, the length is about 20 mm, and the thickness is about 5 mm.
A tape cassette that records and plays PCM signals in a very small size has been proposed.

That is, FIGS. 7 and 8 show the structure of such a cassette. Note that FIG. 7 is an overall perspective view, and FIG. 8 is a plan view with the upper shell removed.

In these figures, (1) shows the entire case of a tape cassette that stores a magnetic tape for recording and reproducing PCM signals, and this cassette case (1) has an upper shell (
A lid (2) and a lower shell (3) are made to face each other and are tightened together by a screw (4) to open and close an opening (5) formed on the front side of both shells (2) and (3). 6
) is rotatably supported.

Inside this cassette case (1), that is, both shells (2)
, (3), there is a hub drive shaft insertion hole (2a) (2
The magnetic tape T is stored in a wound state between a pair of hubs (7a) and (7b) arranged corresponding to hubs (7a) and (3b), and a part of it is inserted into the front side opening (5). ), and is exposed in a stretched state via pinch rollers (8) and (9) which also serve as guide rollers and are rotatably supported on both sides of the opening (5).

Also, inside this cassette case (1), both hubs (7a
) (7b) is provided with a brake mechanism (11) that performs a braking operation when not in use. Furthermore, on the top and bottom sides of the cassette case (1), there is an accidental erasure prevention mechanism (
12) (13) is provided.

In addition, (14) to (17) are positioning reference holes, (18)
(19) is a plurality of required detection holes, (20) and (21) are a grip portion, (22) is a guide groove, (23) is a changer engagement portion, and (24) and (25) are tape guide members.

During recording and playback, the lid of the cassette case (1) (
A head drum (not shown) is partially inserted into the front side opening (5) which is opened by rotating the head drum 6) upward or downward, and the head drum (not shown) is partially inserted so as to cross this opening (5). The stretched magnetic tape T is slid so as to wrap around the insertion side circumferential surface of the head drum, and a helical scan type recording/reproduction is performed by the rotary head on the head drum.

[Problem to be solved by the invention] By the way, in the tape cassette described above, both shells (2
), (3) are connected to the accidental erasure prevention mechanism (12) (13
) has conventionally been configured as shown in FIG. 9, for example.

Note that the same erroneous erasure prevention mechanisms (12) and (13) are provided upside down, so only one side of them is shown in the figure.

That is, in this figure, a hole (31) communicating with both shells (2) and (3) is formed, and this hole (31)
A slider (32) is provided inside to be slidable in the vertical direction. Click protrusions (33) and (34) are provided on a part of the inner surface of this hole (31) and on the side surface of the slider (32) facing thereto, respectively.
) is provided with a stopper protrusion (35) on a side other than that on which the protrusion (34) is provided, and a stopper that is engaged with the protrusion (35) on the inner surface of the hole (31) opposite thereto. A recess (36) is provided for the purpose. Note that (37) is a protrusion (3
This is a space for giving a predetermined elasticity to the side surface of the slider (32) such as 3).

Therefore, in this device, when the slider (32) is slid toward the lower shell (3) as shown, the protrusion (34) is brought into contact with the lower side of the protrusion (33), and the protrusion ( 35) abuts against the lower end of the recess (36), and the slider (32) is locked in the illustrated position. On the other hand, when the slider (32) is sliding toward the upper shell (2), the protrusion (34) is brought into contact with the upper side of the protrusion (33), and the protrusion (35) is brought into contact with the recess ( The slider (32) is locked by abutting against the upper end of the slider (36).

In this case, the locking position of the slider (32) is determined in consideration of the detection mechanism on the tape recorder main body, and especially when the shape of the tape cassette is extremely small as described above, both The step distance between the upper and lower surfaces of the shells (2) and (3) and the end surface of the slider (32) is extremely strictly defined.

However, in the above-mentioned device, the protrusion (33) is attached to one of the shells (2) and (3), for example, the lower shell (
3) Formed on the side. Therefore, when the slider (32) is sliding toward the lower shell (3), the slider (32)
32) is a protrusion (3) formed on the same lower shell (3).
3) and the lower end of the recess (36), and the positioning of the lock is performed with extremely high precision determined by the molding accuracy of the lower shell (3). However, when the slider (32) is slid toward the upper shell (2), the slider (32)
2) is to be locked to the upper end of the protrusion (33) formed in the lower shell (3) and the recess (36) formed in the lower shell (2), and both shells ( The assembly accuracy of 2) and (3) will have an influence.

That is, in the above-mentioned apparatus, the quality of the product is determined by the assembly accuracy. For this reason, extremely high assembly precision is required during manufacturing, which may pose a problem in mass production, for example, and may not be able to maintain sufficient precision due to aging or the like.

This application was made in view of these points, and the object is to provide a device that has a simple configuration and can always perform highly accurate locking positioning.

[Means for Solving the Problems] A first means according to the present invention is a cassette casing (1) formed by combining an upper shell (2) and a lower shell (3).
) in a tape cassette that uses a slider (32) that is inserted and slid in the thickness direction to prevent erroneous erasure of signals recorded on a tape-shaped recording medium housed inside, The shape of the slider is point symmetrical, and the positioning click stopper means (protrusions) are provided between the slider and each of the upper shell and lower shell.
33a) (33b), (34a) (34b), (3
5a) (35b), stepped portion (36a) (36b))
This is a tape cassette characterized by being provided with.

A second means is the positioning click stopper means (protrusion) in the tape cassette described in the first means.
33a) (33b), (34a) (34b)) are tape cassettes characterized by having surfaces having asymmetrical arcs along the sliding direction.

[Effect]

According to this, the shape of the slider for preventing erroneous erasing is point symmetrical, and the positioning click collar means is provided between the slider and each of the upper shell and the lower shell. The slider can be precisely positioned with respect to both shells, and since the positioning click stopper means has a surface having an asymmetrical arc, positioning clicks can be performed satisfactorily.

〔Example〕

FIGS. 1 to 3 each show an embodiment, and these figures only show the structure of the main parts centering on the erroneous erasure prevention mechanism. Also, in these figures, only one side is shown, similar to the description of the conventional example.

In these figures, a slider (32) is provided in a hole (31) formed in communication with both shells (2) and (3) so as to be slidable in the vertical direction. Then, first and second click protrusions (33a) are provided on the inner surface of the hole (31).
b), and first and second click protrusions (34a) (34
b) are provided, and these protrusions (34a) (
The stopper protrusion (35a) (35
b), and on the inner surface of the hole (31) opposite to this step part (36a) (36b) for a stopper is provided which is engaged with the protrusion (35a) (35b).

Note that (37) is a space for imparting a predetermined elasticity to the side surface of the slider (32) such as the protrusions (33a) and (33b).

That is, in this device, the protrusion (3) of the slider (32)
4a) (34b), protrusions (35a) (35b), protrusions (33a) (33b) on the inner surface of the hole (31), and step portions (36a) (36b) are formed point-symmetrically in pairs on the upper and lower sides.

In this device, when the slider (32) is slid toward the lower shell (3) as shown, the protrusion (34a) is brought into contact with the lower side of the protrusion (33a), and the protrusion (34a) is in contact with the lower side of the protrusion (33a). 35a) abuts against the step (36a), and the slider (32) is locked in the illustrated position. Also, the slider (3
2) is slid toward the amber shell (2), the protrusion (34b) is brought into contact with the upper side of the protrusion (33b), and the protrusion (35b) is abutted against the stepped portion (36b). , the slider (32) is locked.

Therefore, in this device, when the slider (32) is slid toward the upper shell (2), the slider (32) also moves between the protrusion (33b) formed on the upper shell (2) and the stepped portion (36b).
), and when it is sliding toward the lower shell (3), it is locked by the protrusion (33a) and step (36a) formed on the same lower shell (3), and in either case, the shell ( The positioning of the locking is performed with extremely high accuracy determined by the molding accuracy of 2) and (3).

By the way, in this device, the click protrusion (33a
) (33b), (34a) (34b), and if these click positions are shifted, a dead point will be formed between these click points as shown in Figure 4. If such a dead point is formed, the user may misunderstand that the sliding has been completed at this position.

Therefore, in the above-mentioned device, the protrusion (33a) (33
The shape of b) is vertically asymmetrical as shown in FIG. 5, for example. Note that the illustrated example shows a protrusion (33a) and a protrusion (33b).
) are formed upside down.

Therefore, when the shapes of the protrusions (33a) (33b) are formed vertically asymmetrically, the click points can be brought closer together as shown in FIG. 6, thereby avoiding the formation of the dead point described above. can do.

Thus, according to the above-mentioned device, the slider (
The shape of the slider (32) is point symmetrical, and a positioning click stopper means (protrusion (33) is provided between the slider (32) and each of the upper shell (2) and the lower shell (3).
a) (33b), (34a) (34b), (35a
) (35b) and step portions (36a) (36b)), the slider can be precisely positioned with respect to both shells, and the click stopper means for positioning (protrusions (33a) (33b)) can be positioned precisely. Since the surface has an asymmetrical arc, positioning clicks can be performed satisfactorily.

In addition, in the above-mentioned device, the hole (31) and the slider (32
) is not limited to the shapes of the first to third embodiments described above, and various other shapes are possible, but
If the shape of the slider (32) is point symmetrical, the above-mentioned effect can be obtained. In reality, the shape is determined in consideration of clinking during use, stability of the device, etc.

Furthermore, in the above-mentioned device, the asymmetric shape of the click stomper means is not limited to being provided on the protrusion (33a) (33b) side, but may be provided on the protrusion (34a) (34b) side or both of these. .

〔Effect of the invention〕

According to this invention, the shape of the slider for preventing erroneous erasing is point symmetrical, and click stopper means for positioning is provided between the slider and each of the upper shell and the lower shell. The mover can be precisely positioned with respect to both shells, and the click stopper means for positioning is formed into a surface having an asymmetrical arc, so that clicks for positioning can be performed satisfactorily.

[Brief explanation of the drawing]

FIGS. 1 to 3 are configuration diagrams of essential parts of an example of a tape cassette according to the present invention, FIGS. 4 to 6 are diagrams for explaining clicks, and FIGS. 7 and 8 are diagrams of a tape cassette according to the present invention. FIG. 9 is a diagram for explaining the overall configuration of the main parts of a conventional tape cassette. (2) is the upper shell, (3) is the lower shell, (3
1) is the hole, (32) is the slider, (33a) (33b)
, (34a) and (34b) are the first and second
(35a) and (35b) are projections for a stopper, (36a) and (36b) are stepped portions for a stopper, and (37) is a space for providing a predetermined elasticity. Agent Hidemori Matsukuma's 1st generation Figure 8 Promotion amendment 1990 1 February 13 1, Incident display + 4i 2000 patent application No. 278751 2, Name of the invention Arp cassette 3, ? Relationship with cases of people who commit i-correction

Claims (1)

[Scope of Claims] 1. Recording is performed on a tape-shaped recording medium housed inside using a slider that is inserted and slid in the thickness direction of a cassette case formed by combining an upper shell and a lower shell. In the tape cassette, the shape of the slider is configured to be point symmetrical, and click stopper means for positioning is provided between the slider and each of the upper shell and the lower shell. A tape cassette characterized by being provided with. 2. The tape cassette according to claim 1, wherein the positioning click stopper means has a surface having an asymmetrical arc along the sliding direction.