JPH11273300A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely assemble an upper half and also to prevent a slider from dislocating when a magnetic tape cassette is assembled. SOLUTION: A cassette case 30 is constituted for housing a pair of take-up hubs winding a magnetic tape thereon, and this magnetic tape cassette is provided with the upper half 10 and lower half 12 coupled in the combined state with a cover so as to expose only the part of the magnetic tape put over between a pair of take-up hubs, and a slider 14 provided with the rectangular bottom face 14a and the side surfaces 14c erected on the bottom face 14a along both ends in the left/right longitudinal direction and mounted on the outside lower surface of the lower half 12 freely slidably in the back/forth direction along the bottom face of the lower half 12 so as to be capable of opening/ closing a guide inserting part of the front side of the cassette case 30 and a reel shaft inserting hole of the bottom face of the lower half 12. In the magnetic tape cassette, a slender band planar extending part 14d extending inside is provided along at least one part of the upper ends of the both left/right side surface 14c of the slider 14, and at least one of the upper surface 14f or lower surface of the extending part 14d is formed into a taper shaper more increasing the thickness of the extending part 14d inwardly.

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 particularly to an improvement in a slider mounted on a lower half for protecting a magnetic tape.

[0002]

2. Description of the Related Art As is well known, a magnetic tape cassette such as a DDS or a DAT has a pair of take-up hubs or a pair of winding hubs each having a long magnetic tape fixed at each end and wound around the magnetic tape. The take-up reel is housed in a cassette case (cassette body composed of an upper half and a lower half joined in a lid-like manner) exposing only a portion of the magnetic tape stretched between the two hubs. Is done.
Since high-density recording is performed on the magnetic tape, it is necessary to improve the hermeticity of the case, especially in order to prevent the fingers from contacting the magnetic tape and the attachment of dust. Therefore, a front lid is provided in the upper half to cover the front side where the magnetic tape is exposed, and a slider is provided in the lower half to cover the lower side.

FIG. 5 is a perspective exploded view showing a schematic configuration of a conventional magnetic tape cassette. The magnetic tape cassette
A magnetic tape 93 mainly composed of an upper half 90 and a lower half 91, wound between winding hubs 92, 92 therebetween.
Is accommodated. On the front side of the upper half 90, a front lid 94 for covering and protecting the magnetic tape 93 when the cassette is not used.
Are rotatably mounted around the support shaft 94a. Further, a slider 95 is provided on the outer lower surface of the lower half 91 to cover the open portion on the lower side of the case to enhance the sealing performance.
Are slidably mounted in the front-rear direction.

[0004] A brake member 96 is attached to the upper half 90 to prevent the magnetic tape 93 wound around the winding hub 92 from sagging when the cassette is not used. The brake member 96 has two braking pieces 96a, 96a,
By engaging the braking pieces 96a with the gears 92a provided above the winding hubs 92, the rotation of the winding hub 92 is prohibited and the slack of the magnetic tape 93 is prevented. The brake member 96 includes the brake spring 9.
7, the brake pieces 96a,
The gear 96a is biased to a position where it engages with the gears 92a, 92a, respectively. The brake spring 97 has an upper half 90
Is locked by a projection 90a provided on the front side.

The lower half 91 has a rectangular bottom surface 91a.
In addition, when the cassette is used, it has reel shaft insertion holes 91b, 91b for inserting the reel shaft into the cassette case, and extends forward from both right and left sides of the bottom surface 91a.
c, 91c. The space between the left and right overhang portions 91c, 91c is a space into which a so-called tape loading device provided on the recording / reproducing device (deck) side into which the magnetic tape cassette is loaded enters.

The slider 95 has a rectangular bottom surface 95a.
And a side surface 95c provided upright on both right and left ends thereof, and slides in the front-rear direction of the cassette by contacting the bottom surface 91a of the lower half 91 from below. A band-like member 95d is provided at the upper end of a part of the side surface 95c so that the side surface 90b of the upper half 90 engages in an intaglio shape during assembly. The slider 95
When it is located forward, the space between the left and right overhangs 91c of the lower half 91 and the reel shaft insertion hole 91c
The b and 91b are closed by the bottom surface 95a of the slider 95 for dust protection. When the slider 95 is located rearward, the space between the left and right overhang portions 91c, 91c is released, and the bottom surface 95 of the slider 95 is released.
The two holes 95b, 95b provided in a are aligned with the reel shaft insertion holes 91b, 91b.

When the cassette is mounted on the deck during use, the slider 95 is released from the engagement by the action of a device in the deck (not shown), is pressed by a member in the device, and is located rearward. Also, when the cassette is not used,
It is positioned forward by urging means (torsion coil spring 98) provided on lower half 91.

A rib 91d for attaching the torsion coil spring 98 is provided upright on the bottom surface 91a of the lower half 91. Further, a rib (spring receiving rib) 95e for receiving the torsion coil spring 98 and receiving the urging force thereof is provided upright on the bottom surface 95a on the front side of the slider 95.

FIG. 6 shows an upper half 90 and a lower half 9 of FIG.
1. A perspective view of a magnetic tape cassette 99 in which a slider 95 and the like are combined is shown, and FIG. 7 is a sectional view taken along line VII-VII in FIG. As shown in FIG. 7, a slider 95 is mounted on the outer lower surface of the lower half 91, and the upper half 90 is assembled from above. At this time, as described above, the side surface 90b of the upper half 90 is combined with the band-like member 95d provided at the upper end of the side surface 95c of the slider 95 in the shape of an intaglio. As a result, the belt-like member 95d
It works to prevent the coming off.

[0010]

However, in assembling the cassette, when the upper half 90 is assembled from above, the side surface 90b of the upper half 90 is
There is a problem that it may not be possible to assemble the belt-like member 95d provided on the member 5c.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. In assembling a magnetic tape cassette, it is possible to easily and surely assemble the upper half and to prevent the slider from coming off. It is an object to provide a tape cassette.

[0012]

According to the present invention, there is provided a cassette case for accommodating a pair of winding hubs each having a magnetic tape wound thereon, the cassette case being provided between the pair of winding hubs. Upper and lower halves joined together so that only the magnetic tape in the stretched portion is exposed, and a rectangular bottom surface and side surfaces erected perpendicular to the bottom surface along both left and right longitudinal directions. And a guide insertion portion provided on the front side of the cassette case and a reel shaft insertion hole on the bottom surface of the lower half, which can be opened and closed, and slidable in the front-rear direction along the bottom surface of the lower half. A slider mounted on the magnetic tape cassette, wherein at least a part of the upper end surface of each of the left and right side surfaces of the slider is provided with an elongated strip-shaped projection extending inward, Above the overhang Or at least one of the lower surface,
A magnetic tape cassette characterized in that the taper is formed so that the thickness of the overhang portion increases toward the inner side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic tape cassette of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is an exploded perspective view showing a schematic configuration of a magnetic tape cassette according to the present invention. The magnetic tape cassette is slidably mounted on the upper half 10, the lower half 12, and the lower outside of the lower half 12 slidably in the front-rear direction. 14 mainly. Basically, portions other than the slider 14 are the same as the conventional example shown in FIG.

A pair of take-up hubs 16 and 16 are accommodated in a cassette case composed of an upper half 10 and a lower half 12.
The magnetic tape 18 wound and stretched is accommodated. When the cassette is not used, the upper half 10 is provided with a brake member 20 so that the winding hub 16 rotates and the magnetic tape 18 does not slack. The brake member 20
It has two brake pieces 20a, 20a, and this brake piece 20a
Engages with a gear 16 a provided on the winding hub 16 to inhibit the rotation of the winding hub 16. When the cassette is not used, the brake member 20
Is biased by a brake spring 22 using a torsion coil spring so that the braking piece 20a is engaged with the gear 16a. The brake spring 22 is connected to the upper half 10
It is attached to a rib 10a provided inside. When the cassette is not used, the upper half 10 has a magnetic tape 18 stretched between the pair of winding hubs 16, 16.
A front cover 24 is provided on the front surface of the upper half 10 in order to protect the portion.

The lower half 12 has a rectangular bottom surface 12a.
And a reel shaft insertion hole 12b for inserting the reel shaft into the cassette case when the cassette is used, and a projecting portion 12 extending forward from both left and right ends of the bottom surface 12a.
c, 12c. The space between the left and right overhanging portions 12c, 12c is a space provided on the deck side in which the magnetic tape cassette is loaded, in which a so-called tape loading device enters.

The slider 14 has a rectangular bottom surface 14a.
The bottom half 12 has a side surface 14c vertically provided on the bottom surface 14a at the left and right ends thereof, and slides in the front-rear direction of the cassette in contact with the bottom surface 12a of the lower half 12 from below. When the slider 14 is located forward, the space between the left and right overhanging portions 12c of the lower half 12 and the reel shaft insertion hole 12b
Is closed by the bottom surface 14a of the slider 14 for dust prevention. When the slider 14 is located rearward, the space between the left and right overhangs 12c, 12c is released, and two holes 14b, 14b formed in the bottom surface 14a of the slider 14 are inserted into the reel shaft. Hole 12
b, 12b.

When the cassette is mounted on the deck, the slider 14 is automatically unlocked by the operation of the device in the deck and is positioned rearward. Also, slider 1
When the cassette is not used, 4 is biased by a slider spring 26 using a torsion coil spring, and is positioned forward. The slider spring 26 is attached to a rib 12d provided on the lower half 12. On the front side of the slider 14, a spring receiving rib 14e for hooking the slider spring 26 and receiving an urging force is provided upright.

According to the present invention, the side surface 14c of the slider 14 is provided.
And improvement of the shape of the upper end. As shown in FIG. 1, an elongated band-plate-like projection 14d is provided at an upper end of the side surface 14c at a part thereof (in the illustrated example, from the middle of the side surface 14c to the rear portion). ing. FIG. 2 shows the upper half 10 and the lower half 12 of FIG.
FIG. 3 is a perspective view of a magnetic tape cassette 30 in which the magnetic tape cassette 30 is combined with the slider 14 and the like. FIG.

As shown in FIG. 3, in this embodiment, the projecting portion 14d provided at the upper end of a part of the side surface 14c of the slider 14 has a tapered shape such that the thickness increases as the upper surface 14f becomes more inward. Side 10 of the upper half 10
The end face b is also formed in a tapered shape in accordance with this.

As a result, even when the upper half 10 is dropped from above during assembling, the assembling can be easily and reliably performed even if there is a slight displacement. Further, even after the assembling, the slider 14 is formed so that the thickness of the overhang portion 14d increases as the tapered shape becomes more inward.
It is hard to come off.

In addition, for example, FIG.
As shown in (5), the lower surface 14g of the overhang portion 14d may be formed in a tapered shape so that the thickness increases toward the inside. In this case, the upper end surface of the side surface 12e of the lower half 12 is also formed in a tapered shape in accordance with this. At this time,
As shown in the drawing, the upper surface 14f of the overhang portion 14d has a planar shape, and the upper half 10 can be simply dropped from above at the time of assembly, and the assembly is easy. As described above, even when the upper surface 14f is flat, the upper half 10 is fixed to the lower half 12 with screws or the like in other portions.
There is no problem in assembling the upper half 10. Alternatively, as shown in FIG. 4B, by combining the above examples, both the upper surface 14f and the lower surface 14g of the overhang portion 14d may be formed in a tapered shape.

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

[0024]

As described above, according to the present invention, an overhang is provided at the upper end of the side surface of the slider, and at least one of the upper surface and the lower surface is tapered so that the thickness increases toward the inside. As a result, the upper half can be easily and reliably assembled, and the slider can be prevented from coming off.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of a magnetic tape cassette according to the present invention.

FIG. 2 is a perspective view showing a magnetic tape cassette in which an upper half, a lower half, and a slider of FIG. 1 are combined.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

4A and 4B are cross-sectional views similar to FIG. 3, illustrating another example of the present embodiment.

FIG. 5 is an exploded perspective view showing a schematic configuration of a conventional magnetic tape cassette.

6 is a perspective view showing a magnetic tape cassette in which an upper half, a lower half, and a slider of FIG. 5 are combined.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

[Explanation of symbols]

 10 Upper half 12 Lower half 12a (Bottom of upper half) 12b Reel shaft insertion hole 12c Overhang 12d Tape guide 14 Slider 14a (Slider) bottom 14c Side 14d Overhang 14e Spring receiving rib 14f Upper surface 14g Lower surface 16 Winding Hub 18 Magnetic tape 20 Brake member 22 Brake spring 24 Front lid

Claims (1)

[Claims] 1. A cassette case accommodating a pair of winding hubs around which a magnetic tape is wound, and a lid-like shape so as to expose only a portion of the magnetic tape stretched between the pair of winding hubs. An upper half and a lower half, which are connected to a rectangular bottom surface and side surfaces vertically erected along the left and right longitudinal ends thereof, and a guide insertion portion and a lower portion provided on the front side of the cassette case. A magnetic tape cassette comprising a slider mounted on the outer lower surface of the lower half so as to be able to open and close the reel shaft insertion hole on the bottom surface of the half, and to be slidable in the front-rear direction along the bottom surface of the lower half. At least a part of an upper end surface of each of the left and right side surfaces of the slider is provided with an elongated strip-shaped projecting portion projecting inward, and at least one of an upper surface or a lower surface of the projecting portion faces inward. Within Magnetic tape cassette is characterized in that a tapered so as to increase the thickness of the extent overhang portions.