JP2002170354A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cassette which prevents the deformation of an elastic locking piece and improves the sureness of a slider lock by improving the shape in the peripheral part of an engaging through-hole which is pierced at a slider and with which an engaging head of the elastic locking piece engages. SOLUTION: The magnetic tape cassette which has the slider sprung and energized in a direction of closing an aperture and a reel shaft slot and includes a slider locking mechanism of detaining the movement of the slider by fitting of a detaining pin arranged at the front end of the elastic locking piece disposed at a lower half into a detaining hole disposed at the slider is provided with a relief section of the detaining pin in an intermediate position of the two detaining holes disposed at the slider.

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, and more specifically, to a magnetic tape cassette,
The present invention relates to a magnetic tape cassette having improved lock reliability by improving the shape of an engagement through hole with which an engagement head of an elastic lock piece engages to prevent deformation of the elastic lock piece. .

[0002]

2. Description of the Related Art Conventionally, a magnetic tape cassette employs a structure for preventing a finger from contacting a magnetic tape and adhering dust since high-density recording is performed. . That is, if a finger touches the magnetic tape or dust adheres to it, the reproduced signal is likely to drop out.Therefore, in order to prevent this, it is necessary to seal the magnetic tape in the cassette case as much as possible when storing the magnetic tape cassette. is there. In addition, as this type of magnetic tape cassette, for example, JISX6
127 (1992), JISX6129 (1993),
A type having an opening, whose structure and dimensions are specified in JIS X 6130 (1996) or the like, may be mentioned.

On the other hand, when a magnetic tape cassette is used, it is natural that an insertion hole for a reel shaft and a space for inserting guides at the time of recording / reproduction are required in the cassette case. As a structure adopted from such a necessity, a lid (front cover) for opening and closing the front portion of the magnetic tape cassette and a slider that slides in the front-rear direction in contact with the bottom surface of the magnetic tape cassette are attached.

When such a magnetic tape cassette is loaded into the recording / reproducing apparatus, the slider is moved backward and the lid is moved to the open position in conjunction with the operation of loading the magnetic tape cassette into the recording / reproducing apparatus. The magnetic tape is moved and the overhanging portion of the magnetic tape is brought into contact with the magnetic head by the tape loading mechanism of the recording / reproducing apparatus, and the magnetic tape is arranged at a position where recording or reproduction is possible. When the reel shaft of the recording / reproducing apparatus inserted from the bottom into the take-up hub of the magnetic tape cassette rotates and winds the magnetic tape on one hub, the magnetic tape fed from the other hub hits the magnetic head. The recording or reproduction described above is performed.

FIG. 3 is an exploded perspective view showing a schematic configuration of a magnetic tape cassette to which the present invention is applied. As shown in the figure, the main body case of the magnetic tape cassette 40 includes:
An upper half 46 and a lower half 48 are connected to each other in a lid-like manner.
A magnetic tape 42 wound between the magnetic tapes 44 is accommodated.

A front lid (lid) 52 for covering and protecting the magnetic tape 42 when the magnetic tape cassette 40 is not used is rotatably mounted around the pin 50 on the front surface of the upper half 46. A slider 62 is slidably mounted on the outer lower surface of the lower half 48 so as to be slidable in the front-rear direction in order to close an open portion on the lower side of the main body case of the magnetic tape cassette 40 to enhance the sealing performance.

When the magnetic tape cassette 40 is not used, the brake member 80 is moved upward to prevent the magnetic tape 42 wound between the supply side and the take-up side hubs 44, 44 from sagging. It is attached to the half 46. The brake member 80 has two braking pieces 82, 82, and these braking pieces 82, 82 are connected to the hub 4 on the supply side and the winding side.
By engaging the gears 78, 78 provided on the upper portions of the hubs 4, 44, the hubs 44, 44 are prevented from rotating, and the magnetic tape 42 is prevented from sagging.

The lower half 48 has a rectangular bottom plate 54. The bottom plate 54 rotatably supports a pair of hubs 44, 44 around which a magnetic tape 42 is wound. When a reel is inserted into the recording / reproducing apparatus, a reel shaft (not shown) is inserted from the recording / reproducing apparatus into the hubs 44, 44, and has reel shaft insertion holes 56, 56 for driving the hubs 44, 44 to rotate. are doing.

Further, the bottom plate 54 has overhang portions 58, 58 extending forward from both left and right ends, and the left and right overhang portions 58, 58 are stretched between the hubs 44, 44 described above. Columnar tape guides 60, 60 for guiding the set magnetic tape 42 to the front of the cassette case through a predetermined path.
Are vertically erected from the bottom plate 54. The overhang 5
A space between the lower and upper halves 48 and 58 does not include the bottom plate 54 and forms an opening of the cassette case.

The slider 62 has a thin flat bottom plate 64 provided in contact with the bottom plate 54 of the lower half 48 from below.
With the bottom plate 64, the opening of the cassette case and the reel shaft insertion hole 5 provided in the lower half 48 are provided.
6 and 56 are closed for dust prevention, and are guided by the side walls 66 of the lower half 48 so as to be slidable in the front-rear direction.

The opening of the cassette case and the reel shaft insertion holes 56, 56 are closed by moving the slider 62 forward, and the opening of the cassette case is opened by moving the slider 62 backward. The positions of the reel shaft insertion holes 56, 56 of the lower half 48 and the reel shaft insertion holes 68, 68 of the slider 62 match, so that the reel shaft of the recording / reproducing apparatus can be inserted.

The bottom plate 54 of the lower half 48 has hubs 44,
An intermediate wall 70 curved in an arc shape is provided along the magnetic tape 42 wound between the intermediate walls 44.
A leaf spring mounting portion 72 is erected in front of a concave portion formed at the center connecting portion of the slider 62, and a slider spring 74 made of a leaf spring is inserted between the concave portion and the leaf spring mounting portion 72. Is pressed forward (in a direction in which the slider 62 closes) by pressing a rib 76 provided on the front side.

When the magnetic tape cassette 40 is not used,
The slider 62 is urged forward by a slider spring 74, and the space (opening) between the left and right protrusions 58, 58 of the lower half 48 and the reel shaft insertion holes 56, 56 are closed by the bottom plate 64 of the slider 62. ing. At this time, locking pins (not shown) provided at the tips of locking pieces (elastic locking pieces) 84, 84 provided on the bottom plate 54 of the lower half 48 will be described later. 62 bottom plate 64
The slider 6 is fitted into the locking holes 86 provided in the slider 6.
2 is blocked (locked).

The locking pieces (elastic locking pieces) 84, 84 provided on the bottom plate 54 of the lower half 48 are used when the magnetic tape cassette 40 is used (that is, when the magnetic tape cassette 40 is loaded into the recording / reproducing apparatus). In conjunction with this loading operation, the locking pieces (elastic locking pieces) 84, 84 are pushed out from locking holes 86, 86 provided in the slider 62 to release the lock, and the slider 62 moves rearward. Thus, the opening between the left and right overhang portions 58, 58 of the lower half 48 is opened.

At the same time, the brake pieces 82, 82 of the brake member 80 are connected to the hubs 44, 4 on the supply side and the winding side.
When the engagement with the gears 78 provided on the upper part of the lower half 48 is released, the reel shaft insertion holes 56,
The position of the reel shaft insertion hole 68 of the slider 62 coincides with the position of the reel shaft insertion hole 68 of the slider 62, so that the reel shaft of the recording / reproducing apparatus can be inserted, and recording or reproduction of the magnetic tape 42a after loading of the magnetic tape cassette becomes possible. Become.

FIG. 4 shows a lower half 48 according to the prior art.
FIG. 5 is a cross-sectional view showing an example of the above-mentioned locking piece (hereinafter referred to as an elastic locking piece) 84 provided on the bottom plate 54 of FIG.
FIG. 7 is a cross-sectional view showing a state where the lock mechanism of the magnetic tape cassette is released and the slider 62 moves and stops in the middle of the bottom plate 54. The elastic lock piece 84 is separated from the bottom plate 54 of the lower half 48 by a gap at the periphery thereof, and
The three sides except 4a are formed in a thin plate shape surrounded by the gap.

At the tip of the elastic locking piece 84, a locking hole 86 provided in the bottom plate 64 of the slider 62,
A pin 84b that fits into the projection 88 is provided as a tapered projection. The elastic lock piece 84 is formed thinner than the bottom plate 54 of the lower half 48 so as to have appropriate elasticity, and near the base end portion 84a of the elastic lock piece 84,
A thin portion 84c that is bent as a hinge portion when the pin 84b is attached to and detached from the locking hole 86 of the slider 62 is formed.

[0018]

Incidentally, the elastic lock piece 84 is provided with a magnetic tape during the operation of loading / unloading the cassette into / from the recording / reproducing apparatus or during the transportation of the cassette after being loaded into a specific case. If a load is applied to the elastic locking piece 84 for a long time while the slider of the cassette is stopped in the middle of the two locking positions, the vicinity of the continuous portion with the lower half 48 is caused by a material fatigue phenomenon. However, there is a problem that the elasticity of the elastic locking piece 84 is lost due to the loss of the spring property, the slider locking function becomes unstable, and in some cases, the locking becomes impossible.

The above-mentioned deformation of the elastic locking piece 84 means that the elastic locking piece 84 is in contact with the locking holes 86 and 88 formed in the bottom plate 64 of the slider 62. Of the elastic locking piece 84 may be disengaged from the locking holes 86 and 88 of the slider 62 in the event of vibration or impact. Get higher.

When the magnetic tape cassette is used, that is, when it is loaded into the recording / reproducing apparatus, it is necessary that the lid and the slider are in an open state. When the holding of the open position is released, the magnetic tape cassette is caught in this state and cannot be taken out of the recording / reproducing apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to solve the problems in the prior art, in which the engaging head of the elastic locking piece formed in the slider is provided. Improve the shape of the engaging through hole periphery to engage,
An object of the present invention is to provide a magnetic tape cassette having improved lock reliability by preventing deformation of the elastic lock pieces.

[0022]

In order to achieve the above object, a magnetic tape cassette according to the present invention is provided in a cassette case so as to be slidable in the front-rear direction, and opens and closes a guide insertion portion and a reel shaft insertion hole. The cassette case is provided with a through hole, and is inserted into and engaged with the engaging through hole at least at a position corresponding to the engaging through hole on the slider sliding surface of the cassette case in a closed state, and locked. What is claimed is: 1. A magnetic tape cassette comprising: an elastic locking piece having an engaging head formed in a cut shape, wherein said elastic tape is formed between said two engaging through-holes formed in said slider and corresponding to a slider open position and a closed position. Is formed in a shape in which the engaging head of the elastic lock piece can enter.

Here, the slider is formed in the slider,
When the portion between the two engaging through holes corresponding to the slider open position and the closed position is formed into a shape in which the engaging head of the elastic lock piece can enter, the portion corresponding to the slider open position and the closed position A configuration in which the portion between the two engagement through holes is also a through hole, or a configuration in which the portion between the two engagement through holes corresponding to the slider open position and the closed position of the slider is formed in a concave shape. .

[0024]

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

FIG. 1 is a sectional view showing the shape of the elastic locking piece 12 of the lower half 10 of the magnetic tape cassette according to one embodiment of the present invention.

As in the case of the above-described prior art, the elastic lock piece 12 is separated from the bottom plate 14 of the lower half 10 by a gap around the bottom, and is surrounded by a gap around three sides except for the base end 12a. As shown in FIG. 1, a locking pin 12 b that fits into locking holes 24 and 26 provided in the bottom plate 22 of the slider 20 at the distal end thereof is provided at the distal end of the elastic lock piece 12 as shown in FIG. It is provided in a projection shape.

The elastic lock piece 12 is formed to be thinner than the bottom plate 14 of the lower half 10 so as to have appropriate elasticity. A thin portion 12c that is bent as a hinge portion when the locking pin 12b is detached from the locking holes 24 and 26 is formed.

The bottom plate 2 of the slider 20 is located at an intermediate position between the locking holes 24 and 26 in the bottom plate 22 of the slider 20.
A concave portion 28 is provided on the upper surface of the second member 2. The width of the recess 28 is a width having an appropriate gap with respect to the width of the locking pin 12 b of the elastic lock piece 12, and the bottom plate 22
It is preferable that the length is sufficiently long as long as the strength of the locking holes 24 and 26 provided in the hole is allowed. Note that both ends of the concave portion 28
It is preferable to use an inclined surface so that the slider 20 can easily get over when moving.

Further, by making the bottom plate 30 of the recess 28 sufficiently thin, when the locking pin 12b of the elastic lock piece 12 is fitted into the recess 28, the elastic lock piece 12 moves the bottom plate 30 of the recess 28. The amount of deformation of the elastic lock piece 12 can be further reduced by deforming the bottom plate 30 downward by the pressing load. In this case, a through groove (not shown) may be provided around the bottom plate 30 to further facilitate the deformation of the bottom plate 30.

According to the present embodiment, by providing the concave portion 28 in the bottom plate 22 of the slider 20, even if the slider 20 is unlocked due to vibration or the like, and the slider 20 moves and stops halfway, FIG. As shown, the locking pin 12b provided in a protruding shape at the tip of the elastic lock piece 12 is
The elastic locking piece 12 fits into the concave portion 28 provided in the bottom plate 22 of the slider 20 and stops without being bent at all or depending on the height of the locking pin 12b and the depth of the concave portion 28.

Further, the bottom plate 30 of the concave portion 28 of the bottom plate 22 of the slider 20 is made sufficiently thin, and the load when the elastic lock piece 12 is fitted into the concave portion 28 causes the bottom plate 30 to become thin.
Is deformed, the amount of deformation of the elastic lock piece 12 can be further reduced. Therefore, even if this state is left for a long time, no deformation occurs in the locking pin 12b.

FIG. 2 relates to another embodiment of the present invention. As shown in the drawing, a through-groove 32 is formed instead of the recess 28 of the bottom plate 22 described above. Here, the lateral width of the through groove 32 is a width having an appropriate gap with respect to the width of the locking pin 12b.
It is preferable that the length be sufficiently long as long as the strength of 4,26 is allowed.

According to this embodiment, even when the slider 20 is unlocked and the slider 20 moves and stops halfway, as shown in FIG. 2, the locking pin 12b at the tip of the elastic locking piece 12 The elastic locking piece 12 is fitted into the through groove 32 provided in the bottom plate 22 of the slider 20 and stops without being bent at all. As in the first embodiment, it is preferable to provide inclined surfaces at both ends of the through groove 32 so that the slider 20 can easily get over when the slider 20 moves.

Comparing the two embodiments described above, the second embodiment is superior to the first embodiment in that the elastic lock piece 12 stops without being bent at all. The second embodiment has advantages and disadvantages in that the first embodiment is superior in that dust may enter the magnetic tape cassette from the through groove 32.

As described above, the magnetic tape cassette according to the present invention has been described in detail. However, the present invention is not limited to the above embodiment, and various improvements and modifications can be made without departing from the gist of the present invention. Of course, changes may be made.

[0036]

As described above in detail, according to the present invention, the shape of the engaging through-hole of the engaging head of the elastic lock piece formed in the slider is improved to improve the elastic lock. By preventing the piece from being deformed, an effect is obtained that a magnetic tape cassette with improved locking reliability can be realized.

More specifically, in a magnetic tape cassette having a slider lock mechanism, even if the lock is released due to vibration or the like and the slider moves and stops halfway, the locking pin of the elastic lock piece is locked by the slider. Even if the elastic lock piece does not ride on the bottom plate, or the locking pin of the elastic lock piece rides on the bottom plate of the slider, the amount of deformation of the elastic lock piece is reduced, and even if it is left for a long time in this state In addition, it is possible to prevent a situation in which the elastic locking piece is deformed and the locking pin cannot be sufficiently fitted into the locking hole and the locking mechanism does not operate sufficiently.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a shape of an elastic lock piece 12 of a lower half 10 of a magnetic tape cassette according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a shape of the elastic lock piece 12 of a lower half 10 of a magnetic tape cassette according to another embodiment.

FIG. 3 is an exploded perspective view showing a schematic configuration of a magnetic tape cassette to which the present invention is applied.

FIG. 4 shows a bottom plate 54 of a lower half 48 according to the prior art.
FIG. 10 is a cross-sectional view showing an example of the elastic lock piece 84 provided in the above.

FIG. 5 is a cross-sectional view showing a state where the lock mechanism of the magnetic tape cassette is released and the slider 62 moves, and stops in the middle of the bottom plate 54;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower half 12 Elastic lock piece 12a Base end of elastic lock piece 12b Lock pin of elastic lock piece 12 14 Bottom plate 20 Slider 22 Bottom plate 24, 26 Lock hole 28 Recess 30 Bottom plate of recess 28 32 Through groove of recess 28

Claims (1)

[Claims] An engaging through-hole is provided in a slider which is slidably provided in a cassette case in the front-rear direction, and which opens and closes a guide insertion portion and a reel shaft insertion hole. A magnetic tape cassette in which an elastic locking piece having an engaging head that is inserted into and engaged with and locked in the engagement through hole at least in a state where the slider is closed at a position corresponding to the engagement through hole is formed in a cut shape. Wherein a portion formed between the two engagement through-holes formed in the slider and corresponding to the slider open position and the closed position has a shape in which the engagement head of the elastic lock piece can enter. A magnetic tape cassette comprising: