JPH0247032B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape cassette used in recording and reproducing apparatuses such as video tape recorders and various other information processing apparatuses.

Construction of a conventional example and its problems As a conventional example, a magnetic tape cassette of the VHS magnetic recording and reproducing system will be explained with reference to FIGS. 1 to 5.

As is well known, a magnetic tape cassette for a video tape recorder has an upper case 2a and a lower case 2b fitted together to form a cassette case 2 in which a tape reel 1 is housed. An opening 3 is formed on the front side of the cassette case 2, and a magnetic tape 4 wound on the tape reel 1 is stretched along the opening 3. 5
is an openable/closable lid provided in the opening 3 to cover the front surface of the magnetic tape 4 located along the opening 3; By the way, the case where the above-mentioned magnetic tape cassette is to be installed in a magnetic recording/reproducing apparatus (hereinafter referred to as a VTR) such as a front loading device will be explained. For front-loading VTRs, as shown in Figure 10, VTR1
A carriage 13 for transporting a magnetic tape cassette 12 to a predetermined position and a lid opening/closing fitting 7 are provided inside the magnetic tape 1.

First, place the magnetic tape cassette 12 into the carriage 1.
3, a detection switch (not shown) provided at the tip of the carriage 13 is activated, and the carriage 13 is moved horizontally from position A to position B, and then vertically from position B to position C. While moving from position B to position C, the second
As shown in the figure, the opening/closing lid 5 and the lid opening/closing metal fitting 7 are in contact with each other, and the opening/closing lid 5 is rotated around the fulcrum 8 by the lid opening/closing metal fitting 7, and the front surface of the cassette case 2 is opened to enable recording and playback. become. In this case, the magnetic tape cassette 12 must be moved downward by the stroke a, and in front loading VTRs, etc., there is a problem in that the thickness L of the VTR 11 is largely influenced by the size of this stroke a. .

As a method of shortening the stroke a, as shown in FIG. 3, by bringing the lid opening/closing fitting 7 into direct contact with the side plate of the opening/closing lid 5, the lid opening/closing fitting 7 and the opening/closing lid 5 can be moved from the fulcrum 8 of the opening/closing lid 5. However, as shown in FIG. The carriage 13 is provided with a gap g, which is slightly smaller than the inner dimension D, so that the magnetic tape cassette 12 can be easily inserted therein. In addition, the front longitudinal dimension of the cassette case 2 is made slightly smaller than the longitudinal inner dimension of the opening/closing lid 5.
Since the gap h is provided so that the opening/closing lid 5 can rotate smoothly, the magnetic tape cassette 12 is shifted to the right side in the figure as shown in FIG.
Further, when the opening/closing lid 5 is similarly inserted biased to the right side, the side plate of the opening/closing lid 5 and the lid opening/closing fitting 7 do not come into contact with each other, and the opening/closing lid 5 is attached to the VTR 11 in the closed state. Here, the tape loading post formed on the VTR 11 is inserted into the opening 3,
An attempt is made to pull the magnetic tape 4 out of the magnetic tape cassette. However, since the opening/closing lid 5 is in a closed state, in the worst case, the magnetic tape cassette 1
2. Also, there was a risk of damaging the tape loading post of the VTR body. Also, on the inside of the side plate of the cassette case 2 covered by the opening/closing lid 5, there is a lock plate 9 for locking the opening/closing lid 5 on one side, and a magnetic tape 4 on the other side. There was a problem that it could not be made thicker.

In order to lock the opening/closing lid 5, as shown in FIGS. 4 and 5, an engaging recess 5a is provided on the inner surface of the opening/closing lid 5, and the cassette case 2 is covered with the opening/closing lid 5 when the opening/closing lid 5 is in the closed state. A lock plate 9 is rotatably provided inside the side plate 2c, and an elastic body 10 is attached to the lock plate 9.
0 to the frame of the cassette case 2,
Then attach the lock plate 9 to the cassette case 2.
It is urged to rotate so that it always comes close to the side plate 2c. The lock plate 9 passes through the through hole 2d provided in the side plate 2c, and the protrusion 9a engages with the engagement recess 5a, thereby locking the opening/closing lid 5.
However, as mentioned above, there is a gap between the longitudinal inner dimension of the opening/closing lid 5 and the front longitudinal dimension of the cassette case 2.
If vibration or impact is applied to the magnetic tape cassette, the entire gap will shift to the side where the lock plate 9 is installed, and the amount of engagement between the engagement recess 5a of the opening/closing lid 5 and the protrusion 9a of the lock plate 9 will decrease. decreases and the opening/closing lid 5 opens, and the magnetic tape 4 loosened by the impact protrudes to the front of the cassette case 2, and when the opening/closing lid 5 attempts to close due to the restoring force of the elastic body, the magnetic tape 4 is opened. Tape damage caused by pinching occurred.

OBJECTS OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks of the prior art, and has an object to provide a tape cassette that can reduce the thickness of a VTR body, particularly for front loading or the like.

Composition of the Invention In order to achieve the above object, the tape cassette of the present invention has an opening formed in the front surface of a cassette case for storing tape reels, a lid supported in the opening so as to be openable and closable, and a lid A notch for inserting an opening member is provided in the opening, and a protrusion that engages with the notch when closed is provided inside the lid.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be explained in the drawings (6th
This will be explained based on FIGS. In the drawings, the same reference numerals as those in the conventional example indicate the same members, and detailed explanation thereof will be omitted.

The magnetic tape cassette of this embodiment has the structure of the conventional example described above, but is further characterized in that a protrusion 5b that engages with the front notch 6 of the cassette case 2 when closed is provided inside the opening/closing lid 5. be.

By the way, the magnetic tape cassette of the example
When attempting to attach the VTR to a VTR, there is a hole below the front notch 6 of the cassette case 2 shown in
When the lid opening/closing fitting 7 installed on the side is positioned and the magnetic tape cassette moves downward, as shown in FIG. Then, the lid opening/closing fitting 7 contacts the outer circumference of the protrusion 5b and rotates the opening/closing lid 5 about the fulcrum 8, thereby opening the front surface of the cassette case 2 and making it possible to record and reproduce. The amount of movement in this case is that the distance from the center of rotation of the opening/closing lid 5 to the point where the lid opening/closing fitting 7 and the protrusion 5b come into contact is shorter than in the conventional example, so that the stroke c shown in FIG. Stroke a of the conventional example shown in Fig. 2
It will be shorter. Therefore, in front-loading VTRs, etc., there is an effect that the thickness of the VTR becomes thinner by the amount of reduction in the amount of movement.

As shown in FIG. 9, the protrusion 5b has a width d at the tip.
is formed to be smaller than the width e of the root portion. This is because when the opening/closing lid 5 performs a closing operation centered on the fulcrum 8 from the open state, the width d of the tip of the protrusion 5b is smaller than the width f of the front notch 6 of the magnetic tape cassette. 5b easily engages with the front notch 6. As the closing operation progresses further, the protrusion 5
The ridge of the taper part b and the edge 6a of the front notch part 6
While in contact with the protrusion 5b, the width f of the front notch 6
is engaged with the center of the

At this time, since the width e of the base of the protrusion 5b and the width f of the front notch 6 are approximately the same width, the opening/closing lid 5
The amount of play in the longitudinal direction is reduced. Therefore, when installing a magnetic tape cassette, the lid opening/closing fitting 7 installed on the VTR side and the protrusion 5b of the opening/closing lid 5 always come into contact with each other in any condition, and the opening/closing lid 5 rotates, which is different from conventional methods. It is possible to prevent damage to the magnetic tape cassette and VTR as in the example, and the amount of engagement between the inner surface engagement recess 5a of the opening/closing lid 5 and the protrusion 9a of the lock plate 9 is always appropriate and constant. This also has the effect of preventing the opening/closing lid 5 from becoming unlocked and damage to the tape that would otherwise occur due to vibration or impact.

Effects of the Invention As described above, according to the present invention, a notch for inserting a member to form an opening/closing lid is provided at the opening of a magnetic tape cassette, and a protrusion that engages with the notch when closed is inserted into the opening/closing lid. Since the stroke required to open the opening/closing lid is shortened by providing the opening/closing cover on the inside, the thickness of the front-loading VTR can be reduced. Incidentally, if the protrusion is tapered, the gap between the protrusion and the notch that engages with the protrusion becomes smaller, thereby preventing the opening/closing lid from becoming unlocked and damage to the tape.

[Brief explanation of drawings]

1 to 5 and 10 to 12 show conventional examples, in which FIG. 1 is a perspective view of a magnetic tape cassette, FIG. 2 is a longitudinal sectional view of the front notch of the magnetic tape cassette, and FIG. Figure 4 is a front side view of the magnetic tape cassette, Figure 4 is a perspective view of the lock plate section, and Figure 5 is a perspective view of the lock plate section.
10 is a side sectional view of a magnetic recording/reproducing device, FIGS. 11 and 12 are lateral sectional views of a magnetic tape cassette, and FIGS. 6 to 9 are cross-sectional views of the magnetic tape cassette. An example of
FIG. 6 is a perspective view of the magnetic tape cassette, FIG. 7 is a vertical sectional view of the front notch of the magnetic tape cassette, FIG. 8 is a bottom view of the main parts of the magnetic tape cassette, and FIG.
The figure is an enlarged view of the main part of FIG. 2...Cassette case, 3...Opening, 4...
Magnetic tape, 5...opening/closing lid, 5a...engaging recess,
5b...Protrusion, 6...Front notch, 6a...Edge, 7...Lid opening/closing fitting, 8...Fully point, 9...Lock plate, 9a...Protrusion.

Claims (1)

[Scope of Claims] 1. An opening is formed in the front surface of a cassette case that stores a tape reel, and a lid supported in an openable and closable manner is provided in the opening, and a notch for inserting a lid opening member is inserted into the opening. The tape cassette is provided with a protrusion on the inside of the lid that engages with the notch when the lid is closed. 2. The tape cassette according to claim 1, wherein the protrusions are tapered.