JP2576003B2 - Tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal such as a PC
The present invention relates to a tape cassette suitable for recording an M signal.

[0002]

2. Description of the Related Art At present, a PCM recording / reproducing apparatus which converts an analog signal such as an acoustic signal into a digital signal, for example, a PCM signal, and records or reproduces the signal has been proposed. This P
In a CM recording / reproducing apparatus, a tape cassette loaded with a magnetic tape as a recording medium is generally used.

Generally, a standard type tape cassette is constructed as shown in FIG. That is, in FIG. 6, reference numeral 1 denotes a cassette housing, and the cassette housing 1 is formed by combining a pair of cassette housing halves 1a and 1b by screwing. Each of the cassette casing halves 1a and 1b is made of a resin, for example, an ABS resin. Reference numeral 2 denotes a magnetic tape stored in the cassette housing 1. Reference numeral 3 denotes a central opening on the front surface of the cassette housing 1, through which a recording / reproducing head is inserted during recording or reproduction. Reference numerals 4a, 4b and 5a, 5b denote small windows and openings arranged in symmetrical positions, respectively, and 6a, 6b and 7a, 7b.
Are capstan insertion holes and positioning holes, 8a and 8 respectively.
“b” indicates the left and right reel shaft insertion holes.

[0004]

However, in such a conventional tape cassette, the cassette casing 1
The central opening 3 and the openings 5a and 5b on the front surface of the main body are relatively large enough to allow a human finger to enter.
A human finger may touch the magnetic tape 2 in the cassette housing 1 via 5a and 5b, and there is a possibility that a fingerprint or the like may be attached to the magnetic tape 2. In particular, in PCM recording, a fingerprint or the like attached to the magnetic tape 2 has a disadvantage of causing a dropout of a reproduced signal.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a magnetic tape in a cassette housing which is free from a possibility that a human finger touches the magnetic tape and a fingerprint or the like is attached.

[0006]

The tape cassette of the present invention is provided on the front side of a cassette housing 1 as shown in FIGS. 1 to 4, for example, and an opening 3 in a front wall portion of the cassette housing 1 is provided. , 4a, 4b, 5a, and 5b, and slides between a first position for closing the openings 3, 4a, 4b, 5a, and 5b and a second position for opening. A tape cassette provided with a shutter member 9 capable of being mounted so as to slide within a range in the longitudinal direction on the front side of the cassette housing 1 and at a first position.
And / or the end of the shutter member 9 in the second position
The engaging part with which the part engages is formed on the cassette casing 1.
It is .

[0007]

According to the tape cassette of the present invention, the through holes corresponding to the openings 3, 4a, 4b, 5a and 5b in the front wall of the cassette housing 1 are provided on the front side of the cassette housing 1. A tape cassette having a shutter member 9 slidable between a first position for closing the openings 3, 4a, 4b, 5a and 5b and a second position for opening. The shutter member 9 is mounted so as to slide within a range in the longitudinal direction on the front side of the cassette housing 1 , and the first
And / or shutter member at the second position
By forming the engaging portion with which the end portion 9 engages in the cassette housing 1, the sliding range of the shutter can be narrowed, and the cassette housing can be downsized. In addition, the size of the recording / reproducing device can be reduced accordingly. Ma
In addition, the shutter 9 opens the central opening 3, the small windows 4a and 4b,
Locked at a position that does not cover the mouths 5a and 5b,
And / or shutter 9 has central opening 3, small window 4a,
Locked at a position covering the opening 4b and the openings 5a and 5b .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape cassette of the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. In FIGS. 1 to 4, the portions corresponding to FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a shutter 9 is provided on the front surface of a cassette housing 1 of a standard tape cassette as shown in FIG. The shutter 9 covers the front openings 3, 5a, 5b and the small windows 4a, 4b in accordance with sliding, and the shutter 9 is made of a non-magnetic metal or phosphor bronze as shown in FIGS. Saga openings 5a, 5
b, a plate having a thickness of 0.3 to 0.4 mm is formed, and through holes are provided at predetermined positions corresponding to the central opening 3, the small windows 4a and 4b, and the opening 5b. At the same time, the end on the opening 5b side is cut out to provide a narrow portion. The narrow end of the shutter 9 is bent into a semi-cylindrical shape to provide a locking projection 9a.
The handle 9b for sliding is provided by bending the handle 9b.

On the other hand, the cassette housing 1 is provided on its front surface with a housing for housing the shutter 9 slidably in the left-right direction. In this case, locking recesses 10 </ b> R and 10 </ b> L are provided in a storage portion for storing the narrow portion of the shutter 9. These recesses 10R and 10L are for engaging the projection 9a on the shutter 9 side to lock the shutter 9 at a predetermined position. In this example, when the convex portion 9a engages with the concave portion 10R, the shutter 9 opens the central opening 3, the small window 4a,
The shutter 9 is locked at a position that does not cover the opening 4b and the openings 5a and 5b, and when the projection 9b is engaged with the recess 10L, the shutter 9 is moved to the central opening 3, the small windows 4a and 4b and the opening 5b.
It is locked at a position covering a and 5b. The rest is configured in the same manner as in the prior art.

According to the tape cassette constructed as described above, when not used for recording and reproduction, that is, during so-called storage, the shutter 9 is slid to the left via the handle 9b, and the projection 9a of the shutter 9 is moved to the cassette housing. Engage with the recess 10L of the body 1 and lock it. In this case, as shown in FIG. 4, the central opening 3, the small windows 4a, 4b and the openings 5a, 5b on the front surface are covered by the shutter 9, and the finger is put on the central opening 3, the small windows 4a, 4
b or the openings 5a and 5b are prevented from contacting the magnetic tape 2.

When the recording / reproducing apparatus is used for recording or reproduction, the shutter 9 is slid to the right via the handle 9b, and the projection 9a of the shutter 9 is moved to the recess 10R of the cassette housing 1. And locked. In this case, as shown in FIG.
a, 4b and the openings 5a, 5b are not covered by the shutter 9, so that the magnetic head 2 and the pinch roller can be brought into contact with the magnetic tape 2 without any trouble.

As described above, according to the tape cassette of the present embodiment, the shutter 9 is provided so as to cover the front central opening 3, the small windows 4a and 4b and the openings 5a and 5b. Can be prevented from coming into contact with the magnetic tape 2 through the central opening 3, the small windows 4a, 4b or the openings 5a, 5b. Suitable for use in recording signals can be obtained.

Further, the sliding range of the shutter may be narrow,
It is possible to reduce the size of the cassette housing,
At the same time, the size of the recording / reproducing device can be reduced.

FIG. 5 shows another embodiment of the present invention.
5 is such that the shutter 9 covers the central opening 3 and the openings 5a and 5b in a symmetrical lattice shape during storage. In the embodiment shown in FIG. It can be easily understood that the same operation and effect as the embodiment shown in FIG. 4 can be obtained.

In the above embodiment, the central opening 3, the small windows 4a and 4b and the openings 5a and 5b are provided by the shutter 9.
However, it is needless to say that the same operation and effect as described above can be obtained even if the entirety is covered. In the above embodiment, the case where the shutter 9 is slid manually by the handle 9b has been described, but the recording and reproducing apparatus can be slid mechanically. Further, it goes without saying that the present invention is not limited to the above-described embodiment, and can adopt various other configurations without departing from the gist of the present invention.

[0017]

According to the tape cassette of the present invention, the shutter 9 is provided so as to cover the central opening 3, the small windows 4a, 4b, and the openings 5a, 5b on the front surface. Part 3, small windows 4a, 4b or openings 5a, 5
b, it is possible to prevent the magnetic tape 2 from coming into contact with the magnetic tape 2 and prevent the reproduced signal from dropping out due to hand marks such as fingerprint marks, and to obtain a signal suitable for recording a PCM signal. it can.

Further, the sliding range of the shutter may be narrow,
It is possible to reduce the size of the cassette housing,
At the same time, the size of the recording / reproducing apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a tape cassette of the present invention.

FIG. 2 is an enlarged plan view of a main part of FIG. 1 in which one half of a cassette casing is removed.

FIG. 3 is an enlarged front view showing a front surface of FIG. 1;

FIG. 4 is a perspective view showing one embodiment of the tape cassette of the present invention.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional standard type tape cassette.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cassette housing 2 Magnetic tape 3 Central opening 4a, 4b Small window 5a, 5b Opening 9 Shutter

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 56-68278 (JP, U) Japanese Utility Model Showa 47-6831 (JP, U) Japanese Utility Model Showa 50-41880 (JP, Y2)

Claims (1)

(57) [Claims] A first opening provided on a front side of the cassette housing, corresponding to an opening in a front wall of the cassette housing, and a first position for closing the opening and a first opening for opening the opening; A tape cassette provided with a shutter member slidable between positions 2 and 3, wherein the shutter member is mounted so as to slide within a range in the longitudinal direction on the front side of the cassette housing.
At the first position and / or the second position
The engaging portion with which the end of the shutter member is engaged is connected to the cassette
A tape cassette characterized by being formed in a housing.