JP2001202742A - Magnetic tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the right and left play of a lid for protecting a magnetic tape of the front side of a magnetic tape cassette. SOLUTION: With respect to a pair of columnar tape guides which are provided vertically in the right and left ends of the bottom surface of a lower half in order to guide the magnetic tape of a part spread between a pair of winding hubs to a cassette front side, a front lid whose both ends are supported by an upper half so as to turn between a position for covering the front side of the magnetic tape exposed in the cassette front side and a position for opening it, has an engagement structure for engaging the front lid with the tape guides and regulating the movement of the lid in the right and left direction.

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 a magnetic tape in which a lid (front cover) provided in front of an upper half is improved to protect the magnetic tape exposed on the front side of the cassette. Regarding cassettes.

[0002]

2. Description of the Related Art Heretofore, small and lightweight magnetic tape cassettes capable of recording digital signals at high density have been used. For example, as a small magnetic tape cassette for recording data from a personal computer or the like, a DD is used.
S (Digital Data Storage) is known, and DAT (Digital Audio Tape) is known as a music tape.

As is well known, a magnetic tape cassette such as a DDS or DAT has a pair of take-up hubs or take-ups around which the magnetic tape is wound after fixing each end of a long magnetic tape. A case (cassette body) formed by combining a reel with an upper half and a lower half joined together with a lid
In addition, only the portion of the magnetic tape stretched between the pair of winding hubs or the like is housed so as to be exposed. Also, since high-density recording is performed on magnetic tape,
In particular, it is necessary to improve the hermeticity of the case in order to prevent the fingers from contacting the magnetic tape and to prevent dust from adhering. Therefore, the upper half is provided with a front lid (lid) for covering the front side where the magnetic tape is exposed, and the lower half is provided with a slider for closing the opening on the lower side when the magnetic tape cassette is not used. Have been.

FIG. 6 is a perspective exploded view showing a schematic configuration of a conventional magnetic tape cassette. The magnetic tape cassette is connected in the form of a lid, and the cassette case (cassette body)
Upper half 110 and lower half 112 constituting a housing to be
And a slider 114 mounted on the lower outside of the lower half 112 so as to be slidable in the front-rear direction. A magnetic tape 132 wound around a take-up hub 130 is accommodated in a case constituted by the upper half 110 and the lower half 112. On the front side of the upper half 110, a front lid (lid) 120 that covers and protects the magnetic tape 132 when the cassette is not used is rotatably mounted around the support shaft 120a. Also, on the outer lower surface of the lower half 112,
In order to cover the open part on the lower side of the case and improve the sealing performance,
A slider 114 is mounted slidably in the front-rear direction.

In order to prevent the magnetic tape 132 wound around the winding hub 130 from being loosened when the cassette is not used,
A brake member 116 is attached to the upper half 110. The brake member 116 prevents the rotation of the winding hub 130 and prevents the magnetic tape 132 from loosening by engaging the braking piece 116 a with the gear 130 a provided on the upper portion of the winding hub 130. The brake member 116 is urged by a brake spring 118 to a position where the brake piece 116a is engaged with the gear 130a when the cassette is not used. The brake spring 118 is locked on a projection 110 a provided on the upper half 110.

The lower half 112 has a rectangular bottom surface 112.
a, reel shaft insertion holes 112b and 112 for inserting a reel shaft into a cassette case when a cassette is used.
b, and has projecting portions 112c, 112c extending forward from both left and right ends of the bottom surface 112a. The left and right overhanging portions 112c, 112c have cylindrical tape guides 112d for guiding the portion of the magnetic tape 132 stretched between the pair of winding hubs so as to be exposed to the front of the case when using the cassette. , 112d project vertically from the bottom surface. The left and right overhang portions 112c, 112
The space between "c" and "c" is a space where a so-called tape loading device provided on the deck side in which the magnetic tape cassette is loaded enters.

The slider 114 slides in the front-rear direction of the cassette while being in contact with the bottom surface 112a of the lower half 112 from below. When the slider 114 is located forward, the slider 114 is located between the left and right overhanging portions 112c, 112c of the lower half 112. Space and the reel shaft insertion hole 112b are formed by the bottom surface 114a of the slider 114.
It is covered to prevent dust. Also, slider 1
14 is located at the rear, the left and right overhanging portions 112
c, 112c, and a reel shaft insertion hole 11 provided in the bottom surface 114a of the slider 114.
4b, 114b are aligned with the reel shaft insertion holes 112b, 112b of the lower half 112. When the cassette 114 is mounted on the deck when the cassette is used, the slider 114 is automatically positioned rearward by the action of the device in the deck. When the cassette is not used, the slider 114 is positioned forward by the leaf spring 122 provided on the lower half 112. Is done.

[0008] Two split-tube-type ribs are formed continuously on the bottom surface 112a of the lower half 112 perpendicularly to the side facing the space between the left and right overhangs 112c, 112c (the side exposing the magnetic tape). A vertical wall-shaped member (reel area front wall) 112e is provided upright. The wall-shaped member 112e curved in the shape of a letter "C" is shaped to follow the magnetic tape wound around the winding hub 130 when the wound ball is placed thereon, and the reel area is provided in the case. Has formed. Then, a columnar rib 124 is erected vertically at substantially the center of a bottom portion 112f divided into a triangular shape by the wall-shaped member 112e. This columnar rib 124
A C-shaped apex portion 122a of the leaf spring 122 is assembled between the leaf spring 122 and the wall-shaped member 112e. Slider 1
14 is urged by a leaf spring 122 so as to be fixed at a front position when the cassette is not used, but receives a biasing force from a distal end portion 122b of the leaf spring 22, so that a wall perpendicular to the front of the bottom surface 114a is provided. Rib 114c is provided.

FIG. 7 shows the inside of the upper half 110 turned upside down. In FIG. 7, the other side of the lid 120 is the front. The lid 120 is connected to the side plate 12.
A pivot pin 120c provided inside the upper half 110b is rotatably supported by pin support holes 110c provided in left and right flange portions 110b of the upper half 110.

FIG. 8 shows a magnetic tape cassette constructed by combining the upper half 110, the lower half 112, the slider 114 and the like in FIG. FIG. 9 is a sectional view of the magnetic tape cassette taken along line IX-IX. FIG.
This shows a state when the magnetic tape cassette is not used. When not in use, the slider 114 is located in front of the cassette, and the lid 120 also covers the front surface of the cassette to protect the magnetic tape. At this time, as shown in FIG. 9, the magnetic tape 132 guided to the cassette front side by the tape guide 112d is sandwiched and protected by the lid 120 and the wall-shaped rib 114c of the slider 114.

[0011]

However, in the above-described conventional magnetic tape cassette, the lid 120 has a flat plate inside as shown in FIG. 9, and the lid 120 has a flat shape as shown in FIG. The left and right support pins 120c
It is only supported by the pin supporting hole 110c of the upper half 110 by only. As a result, for example, when the magnetic tape cassette is not used, when a shock is applied due to carrying or the like, there is a problem that the lid 120 shifts in the horizontal direction (left-right direction), that is, there is a problem that a so-called play occurs. Lid 1
If the 20 is displaced in the left-right direction, as shown in FIG. 9, the gap between the lid 120 and the tape guide 112d is very narrow, and there is a possibility that the magnetic tape 132 may be scraped at this portion.

On the other hand, for example, the support pin 12
It is conceivable that the play is regulated by 0c and the size of the pin support hole 110c. However, in this case, the more restrictive, the worse the slidability when opening and closing the lid 120, and the problem of powder falling when the lid 120 slides, there are problems, such as an effective countermeasure against rattling of the lid. Could not be realized. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to provide a magnetic tape cassette in which the lid for protecting the magnetic tape on the front side of the magnetic tape cassette is prevented from rattling.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a cassette body for accommodating a pair of take-up hubs around which a magnetic tape is wound, wherein a cassette body is provided between the pair of take-up hubs. An upper half and a lower half which are joined together so as to expose the stretched portion of the magnetic tape to the front side of the cassette, and a cassette along the outer lower surface of the lower half so that the opening of the cassette body can be opened and closed; A slider mounted slidably in the front-rear direction and a magnetic tape of a portion stretched between the pair of winding hubs are vertically provided on left and right ends of the bottom surface of the lower half so as to guide the magnetic tape to the front side of the cassette. Front lid whose both ends are supported by the upper half so as to be rotatable between a pair of columnar tape guides provided and a position for covering the front side of the magnetic tape exposed to the front side of the cassette and a position for opening the tape. And A magnetic tape cassette, the front lid, said tape guides and engaged, to restrict the movement of the left and right of the front cover, to provide a magnetic tape cassette characterized by having an engagement structure.

Further, as the engagement structure of the front lid,
It is preferable that at least one of the positions of the front lid corresponding to the pair of tape guides, a meat stealing portion be provided inside the front lid.

Further, as the engagement structure of the front lid,
It is preferable that a rib parallel to the tape guide is provided inside the front cover at at least one of positions of the front cover corresponding to the pair of tape guides.

Further, as the engagement structure of the front cover, a meat steal portion is provided inside the front cover at least at one of positions of the front cover corresponding to the pair of tape guides, and the tape is provided. Preferably, a rib parallel to the guide is provided.

[0017]

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

FIG. 1 is a perspective view showing a first embodiment of a magnetic tape cassette according to the present invention. FIG. 1 shows a combination of an upper half 10, a lower half 12, a slider 14, and the like.
FIG. 8 shows a magnetic tape cassette main body configured to house a magnetic tape wound around a pair of take-up hubs therein, and shows a state in which respective members shown in an exploded perspective view in FIG. 6 are combined. It corresponds to. The members constituting the magnetic tape cassette are the same as those shown in FIG. 6, and a detailed description thereof will be omitted.

In FIG. 8, the slider 114 is in the closed position in front of the cassette, and the lid 120 is also in the closed position covering the magnetic tape in front of the cassette. In FIG. 1, the slider 14 is in the open position behind the cassette. In this position, the lid 20 also rotates around the support shaft 20a and is in the open position where the front surface of the cassette is opened. When the lid 20 is in the open position,
The magnetic tape 32 guided by the tape guides 12d provided on the overhang portions 12c at the front left and right ends of the lower half 12 is exposed on the front surface of the cassette.

FIG. 2 is a perspective view showing a state where the magnetic tape cassette shown in FIG. 1 is turned upside down. As shown in FIG. 2, when the slider 14 is in the open position behind the cassette,
The reel shaft insertion hole 14b of the slider 14 and the reel shaft insertion hole 12b of the lower half 12 coincide with each other, and a reel shaft (not shown) on the deck side can be inserted to drive the winding hub 30. Also, overhanging portions 12c at the front left and right ends of the lower half 12;
The space between the tapes 12c is opened for entry of a tape loading device (not shown) on the deck side, and the inside of the cassette in which the magnetic tape wound around the take-up hub 30 is stored to protect the magnetic tape from dust. Is shielded by a wall-shaped rib 14c in front of the slider 14.

In the present embodiment, a structure is provided in which a lid 20d is provided inside the lid 20 at a position corresponding to the tape guide 12d so as to engage with the tape guide 12d. The play in the direction is regulated. For easier understanding, FIG. 3 shows the magnetic tape cassette of this embodiment in FIG.
FIG. As shown in FIG.
0 is formed in a shape corresponding to the circumference of the cylindrical tape guide 12d. As a result, the meat stealing portion 20d is engaged with the tape guide 12d, and backlash to the left and right is prevented. At this time, since the magnetic tape 32 hits the edge 20e of the meat stealing portion 20d, the edge 20e is preferably rounded. Note that FIG.
As shown in FIG. 5, in the present embodiment, the meat steal portions 20d, 20d are provided at positions of the lid 20 corresponding to the pair of tape guides 12d, 12d, respectively. Good.

Next, a second embodiment of the present invention will be described. FIG. 4 is a perspective view of the magnetic tape cassette according to the present embodiment. FIG. 4 shows a state in which the slider 14 is in the open position behind the cassette and the lid 20 is also in the open position in which the front of the cassette is opened, as in FIG. 2, with the magnetic tape cassette upside down. In the first embodiment, as the engagement structure between the lid 20 and the tape guide 12d, a concave portion (thickening portion 20d) is provided on the lid 20 side. As the convex portion (ribs 22a, 22b, 22c,
d) is provided.

The ribs 22a and 22b and the ribs 22c and 22d are provided inside the lid 20 at positions sandwiching the tape guide 12d. FIG. 5 shows a sectional view corresponding to FIG. The tape guide 12d is sandwiched between the ribs 22a and 22b, which prevents the lid 20 from rattling in the left-right direction. Further, the shape of the rib is preferably rounded so that the magnetic tape 32 does not damage the magnetic tape 32.

In this embodiment, a pair of tape guides 12
Although the ribs are provided for both d and 12d, only one of the sets of the ribs 22a and 22b or the set of the ribs 22c and 22d may be provided. Alternatively, only one of the combination of the ribs 22a and 22d or the combination of the ribs 22b and 22c may be provided.

Further, the first embodiment and the second embodiment may be implemented not only independently but also simultaneously. That is, both the stolen portion 20d and the ribs 22a and 22b may be provided inside the lid 20 at a position corresponding to the tape guide 12d. As described above, according to the present embodiment, by providing the engagement structure between the lid and the tape guide, it is possible to prevent the lid from rattling in the left-right direction.

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

[0027]

As described above, according to the present invention, by providing the engagement structure between the lid and the tape guide,
It has become possible to prevent back and forth play of the lid.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a magnetic tape cassette according to the present invention.

FIG. 2 is a perspective view showing a state where the magnetic tape cassette of FIG. 1 is turned upside down.

FIG. 3 is a cross-sectional view corresponding to FIG. 9 and showing a steal portion provided on a lid;

FIG. 4 is a perspective view corresponding to FIG. 2, showing a second embodiment of the magnetic tape cassette according to the present invention.

FIG. 5 is a cross-sectional view corresponding to FIG. 3, showing a rib provided on the lid.

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

FIG. 7 is a perspective view showing the upper half of FIG. 6 upside down.

FIG. 8 is a perspective view showing a cassette main body formed by combining respective members of the magnetic tape cassette of FIG. 6;

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;

[Explanation of symbols]

Reference Signs List 10 Upper half 12 Lower half 12b Reel shaft insertion hole 12c Overhanging portion 12d Tape guide 14 Slider 14b Reel shaft insertion hole 14c Wall-shaped rib 20 Lid 20d Lightening portion 20e Edge 22a, 22b, 22c (of lightening portion) 22d Rib (provided on lid) 30 Take-up hub 32 Magnetic tape

Claims (1)

[Claims] 1. A cassette body accommodating a pair of winding hubs wound with a magnetic tape, wherein a portion of the magnetic tape stretched between the pair of winding hubs is exposed to the front side of the cassette. An upper half and a lower half coupled in a lid-like manner; a slider mounted to be slidable in the front-rear direction of the cassette along an outer lower surface of the lower half so that the opening of the cassette body can be opened and closed; A pair of columnar tape guides provided vertically on the left and right ends of the bottom surface of the lower half so as to guide the magnetic tape stretched between the take-up hubs to the front side of the cassette; A front lid whose both ends are supported by the upper half so as to be rotatable between a position covering the front side of the magnetic tape and an opening position, wherein the front lid is , The table A magnetic tape cassette having an engagement structure for engaging with the guide and restricting the front cover from moving left and right.