JPH0955063A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly turn a lid by surely preventing the contact between a corner part of the inner lid adjacent to the inside surface of a tape drawing out part and an inside edge part of the tape drawing out part adjacent to the corner part. SOLUTION: This tape cassette is furnished with a main body 10 of cassette which is composed of an upper half 2 and lower half 3 and also provided with a pair of tape drawing out parts 4 projected forward, and the freely opening/ closing lid for covering the magnetic tape exposed outside over the space between the tape drawing out parts 4. The lid 5 consists of a front lid 50, inner lid 51 and top lid, by which the magnetic tape is covered from the surface side, rear side and upper side. At this time, notched parts 6, 7 for preventing the contact are provided on the corner part 51a of the inner lid 51 adjacent to the inside surface 40 of the tape drawing out part 4 and on the inside edge part 41 of the tape drawing out part 4 adjacent to the corner part 51a.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tape cassette,
Particularly, the present invention relates to a tape cassette suitable for use in a DVC (digital video cassette) and an 8 mm video cassette.

[0002]

2. Description of the Related Art A cassette body having an upper half and a lower half and having a pair of tape pull-out portions projecting forward, and an openable lid for covering a magnetic tape exposed to the outside between the tape pull-out portions. And the lid is
In a tape cassette composed of a front lid, an inner lid, and a top lid, when the tape cassette is not used, by covering the magnetic tape with the lids from the front surface side, the back surface side, and from above,
It is possible to prevent dust from adhering to the magnetic tape and to rotate the respective lids so as to retract the respective lids from the magnetic tape when loading the deck so that the loading can be performed.

[0003]

By the way, in the above-mentioned tape cassette, as shown in FIG. 9, when the lid 5'is rotated, the inner side surface 40 'of the tape pull-out portion 4'is.
Adjacent to the corner portion 51a 'of the inner lid 51',
The inner edge 41 ′ of the tape pull-out portion 4 adjacent to the corner portion 51 a ′ may come into contact, which may hinder the smooth rotation of the lid 5.

Therefore, an object of the present invention is to surely prevent contact between a corner portion of the inner lid adjacent to the inner side surface of the tape pull-out portion and an inner edge portion of the tape pull-out portion adjacent to the corner portion. And to provide a tape cassette capable of smoothly rotating the lid.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cassette body having an upper half and a lower half and having a pair of tape pull-out portions projecting forward, and a magnetic field exposed to the outside between the tape pull-out portions. An openable lid that covers the tape, wherein the lid covers the magnetic tape from the front side, the back side, and from above, in a tape cassette consisting of a front lid, an inner lid, and a top lid, One or both of a corner portion of the inner lid adjacent to the inner side surface and an inner edge portion of the tape drawer portion adjacent to the corner portion are provided with a contact preventing cutout portion. The above object is achieved by providing a tape cassette having the following.

In the tape cassette of the present invention, one or both of the corner portion of the inner lid adjacent to the inner side surface of the tape pull-out portion and the inner edge portion of the tape pull-out portion adjacent to the corner portion are provided. Since the notch for contact prevention is provided, these contacts are avoided during the operation of the inner lid, and the lid is smoothly rotated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 8 show an embodiment of a tape cassette according to the present invention. In these figures, reference numeral 1 indicates a tape cassette, and T indicates a magnetic tape.

In the tape cassette 1, a magnetic tape T (see FIG. 2) having a predetermined length whose both ends are fixed to a pair of reels R (see FIG. 2) is housed in the cassette body 10 to keep the reel R constant. By rotating the magnetic tape T in the longitudinal direction, the magnetic tape T is rotated in the longitudinal direction for recording / reproducing.

As shown in FIGS. 1 and 2, the tape cassette 1 is composed of an upper half 2 and a lower half 3, and a cassette body 10 having a pair of tape pull-out portions 4 and 4 projecting forward, and the tape main body 10 described above. An openable lid 5 for covering the magnetic tape T exposed to the outside is provided between the tape pull-out portions 4 and 4.

The lid 5 covers the magnetic tape T from the front surface side, the back surface side, and the upper side, and a front lid 50,
It is composed of an inner lid 51 and a top lid 52.

A notch 6 for preventing contact is provided at a corner 51a of the inner lid 51 adjacent to the inner side surface 40 of the tape pull-out portion 4, and this corner 51a is also provided.
Adjacent to the inner edge portion 41 of the tape pull-out portion 4,
A notch 7 for contact prevention is provided (see FIG. 5).

The tape cassette 1 will be described in more detail. As shown in FIGS. 3 and 4, the inner side surface 40 (see FIG. 5) of the tape pull-out portion 4 is the top plate portion 20 of the upper half 2 (see FIG. 5). (See FIG. 3).
And the inner end portion 31a of the guide wall portion 31 that is erected from the bottom plate portion 30 of the lower half 3 (see FIG. 4). As shown in FIG. 4, the guide wall portion 31 is provided with a smoothly curved corner portion 32 (see FIG. 4) so that the magnetic tape T can be pulled out smoothly. In the tape cassette of the present invention, the inner edge portion of the tape pull-out portion is the edge portion of the inner end portion of the wall portion 31 in the tape cassette 1 of the present embodiment,
The notch 7 is provided at this edge.

As shown in FIG. 5, a J-shaped (or inverted J-shaped) guide slit 4 is formed on the inner side surface 40 of the protruding portion 4.
2 is formed, and a protrusion 51b (see FIG. 6) of an inner lid 51 described later is moved along the guide slit 42 so that the inner lid 51 can be smoothly rotated. .

As shown in FIG. 3, the front lid 50 has a U shape in plan view, and a protrusion 50b is formed on an inner side surface 50a thereof. The front lid 50 is rotatably pivoted on the outer side of the cassette body 10 via the protrusion 50b. In addition,
The front lid 50 is biased in the closing direction by a spring S inserted in the protrusion 50b.

As shown in FIG. 6, the top lid 52 has a projection 52a formed on the inner surface of the front portion thereof.
The front lid 50 is rotatably pivoted on both sides of the front portion of the front lid 50. A guide protrusion 52b is formed on the inner surface of the rear portion of the top lid 52, and the guide protrusion 52b is moved along a guide groove 11 of the cassette body 10 to be described later to move the top lid 52. It is provided so that it can be opened and closed by sliding along the upper surface of the cassette body 10.

The upper end of the inner lid 51 is rotatably mounted on the lower surface of the top lid 52 via a protrusion 52a. Further, a protrusion 51b that moves in the guide slit 42 is formed behind the lower end portion of the inner lid 51.
When the projection is opened, the projection 51b
By moving the inside, the inner lid 51
However, the magnetic tape T is retracted from the back side.

A lock member 12 is rotatably mounted on one outer side of the cassette body 10. The lock member 12 is provided with a locking claw 12a. By locking the locking claw 12a to the locking portion 50c of the front lid 50, the front side of the tape cassette 1 is not used. The lid 50 is designed so as not to be opened carelessly.

Further, guide grooves 11 for smoothly sliding a top lid 52, which will be described later, are formed on both outer side portions of the cassette body 10. The guide groove 11 includes an inclined portion 11a and a flat portion 11b that is continuous with the inclined portion 11a and extends rearward. The inclination angle α of the inclined portion 11a in the guide groove 11 is 45.
It is said to be °. The inclination angle α of the inclined portion 11a is 3
5 ° to 55 °, particularly 40 ° to 50 ° are preferable. When the inclination angle α exceeds 55 °, the angle of the inclined portion when the guide protrusion 52b of the top lid 52 comes into contact with the lid 5 at the time of opening operation of the lid 5 described later is formed to be closer to the vertical direction, and the lid 5 and the cassette body 10 are formed. The resistance between the lid and the lid will not be able to open smoothly, and
When the inclination angle α is less than 35 °, the inclination angle α is
Is 35 ° or more, the inner lid 51 falls more quickly in the initial opening operation of the lid 5, and the lower end of the inner lid 51 buffers the magnetic tape T.

When the tape cassette 1 is loaded on a deck (not shown), a mechanism on the deck side causes the locking claws 11a of the lock member 11 to move as shown in FIGS.
The lock state by is released. Then, the front lid 50 is rotated upward by the mechanism on the deck side so that the surface of the magnetic tape T is exposed, and
The top lid 52 is interlocked with the rotation of the front lid 50 and guided by the guide groove 11 of the cassette body 10 to slide rearward. In addition, the inner lid 51
Also, interlocking with the rotation of each of these lids, it slides upward so as to be retracted from the back surface of the magnetic tape T by being guided by the guide slit 42 provided on the inner side surface 40 of the tape pull-out portion 4.

At this time, the corner portions 51a and 51a of the inner lid 51, which are adjacent to the inner side surface 40 of the tape pull-out portion 4, are formed.
to the inner edge portion 41 of the tape pull-out portion 4 adjacent to a,
Since the notches 6 and 7 for contact prevention are provided, these contacts are avoided during the operation of the inner lid 51, and the lid 5 is smoothly rotated.

As described above, according to the tape cassette 1 of the present embodiment, the corner portion 51a of the inner lid 51 adjacent to the inner side surface 40 of the tape drawer portion 4 and the tape drawer portion adjacent to the corner portion 51a. Since the contact with the inner edge portion 41 of 4 is reliably prevented, the lid 5 can be smoothly rotated.

The tape cassette according to the present invention is not limited to the tape cassette 1 of the above-mentioned embodiment, and its size, shape and the like can be appropriately changed without departing from the object of the present invention.

For example, in the tape cassette 1 of the present invention, as in the tape cassette 1 of the above embodiment, the corner portion 51a of the inner lid 51 and the corner portion 51a which are adjacent to the inner side surface 40 of the tape pull-out portion 4 are provided. It is particularly preferable to provide the notches 6 and 7 both on the inside edge 41a of the tape pull-out portion 4 adjacent to the above, but only on either the corner or the inside edge. You may do it.

[0025]

According to the tape cassette of the present invention,
The corner of the inner lid, which is adjacent to the inner side surface of the tape drawer, and the inner edge of the tape drawer, which is adjacent to the corner, are securely prevented from contacting, and the lid is rotated smoothly. Can be made.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outer appearance of an upper portion of an embodiment of a tape cassette according to the present invention.

FIG. 2 is a perspective view showing an outer appearance of a lower portion of the tape cassette of the same embodiment.

FIG. 3 is a bottom view of a main part of the tape cassette of the same embodiment.

FIG. 4 is a plan view showing a form of a lower half of the tape cassette of the same embodiment.

FIG. 5 is a side view of essential parts showing the inner side surface of the tape pull-out portion in the tape cassette of the embodiment.

FIG. 6 is a side view of essential parts showing a closed state of a lid in the tape cassette of the same embodiment.

FIG. 7 is a side view of the essential parts showing the state of rotation of the lid in the tape cassette of the same embodiment.

FIG. 8 is a perspective view of the state of FIG. 7 viewed from the lower side of the tape cassette.

FIG. 9 is a perspective view of a main part showing a rotating state of a lid in a conventional tape cassette.

[Explanation of symbols]

 1 Tape Cassette 10 Cassette Body 2 Upper Half 3 Lower Half 4 Tape Drawout 40 Inner Side 41 Inner Edge 5 Lid 50 Front Lid 51 Inner Lid 51a Corner 52 Top Lid 6, 7 Notch

Claims (1)

[Claims] 1. A cassette body 10 having a pair of tape pull-out portions 4 each of which is composed of an upper half 2 and a lower half 3 and protrudes forward, and a magnetic tape T exposed to the outside between the tape pull-out portions 4. And a lid 5 that is openable and closable, and the lid 5 covers the magnetic tape T from the front surface side, the back surface side, and the upper side, and includes a front lid 50, an inner lid 51, and a top lid 52. Contact with either or both of a corner portion 51a of the inner lid 51 adjacent to the inner side surface 40 of the tape pulling-out portion 4 and an inner edge portion 41 of the tape pulling-out portion 4 adjacent to the corner portion 51a. A tape cassette having a notch for prevention.