JPH0313917Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape cassette suitable for use in recording digital signals, such as PCM signals.

BACKGROUND TECHNOLOGY AND PROBLEMS Currently, a PCM recording and reproducing apparatus has been proposed that converts an analog signal such as an audio signal into a digital signal, such as a PCM signal, and records or reproduces the same.

This PCM recording and reproducing apparatus usually uses a magnetic tape as a recording medium. A first tape cassette is used to load this magnetic tape.
Something like the one shown in the figure is being considered. That is, in FIG. 1, reference numeral 1 indicates a cassette case, and this cassette case 1 is composed of a pair of cassette case halves 1a and 1b which are joined together by screws.
Reference numeral 2 denotes a lid opening/closing lid rotatably provided on the front side of the cassette of the cassette case 1. As shown in FIG.
3 is a magnetic tape loaded into the cassette case 1.

In such a tape cassette, during recording or reproduction, the lid 2 is rotated as shown in FIG. 2 to expose the magnetic tape 2, and recording or reproduction is performed through this exposed portion. Furthermore, during storage other than during recording or playback, the magnetic tape 3 is sealed with the cassette case 1 and lid 2 as shown in Fig. 1, and scratches, dirt, and dust that cause playback signal dropout are removed from the magnetic tape. This is done so that it does not stick to tape 3.

Incidentally, there is a demand for such tape cassettes to be compact, and with this demand for miniaturization, the cassette cassettes 1a, 1b and the lid 2 are becoming smaller.
Since the magnetic tape 3 is molded thinly, the lid 2 that protects the magnetic tape 3 has the disadvantage that it comes off from the cassette case 1 when subjected to a sharp impact or when rotated. In order to eliminate this inconvenience, as shown in FIG. 3, a rotating shaft 2b, which is provided on the arm 2a of the lid 2 and rotatably supports the lid 2 on the cassette case 1, has a tapered end. What you bring is considered. In the case where the rotating shaft 2b is tapered in this manner, the lid 2 can be prevented from coming off from the cassette case 1. However, since the rotating shaft 2b is tapered inward, it is difficult to mold it with a mold.

Purpose of the invention In view of the above, the object of the present invention is to provide a tape cassette that can be easily molded using a metal mold, has a simple structure, and has a lid that does not easily come off.

Summary of the invention The present invention provides a tape cassette in which a lid is rotatably provided in the cassette cassette, in which a groove is provided in the cassette cassette so that the end of the lid is located within the groove. This is a tape cassette in which the lid is difficult to come off. According to the tape cassette of the present invention, it can be easily molded with a mold, and the lid is difficult to come off with a simple structure.

Embodiment Hereinafter, an embodiment of the tape cassette of the present invention will be described with reference to FIGS. 4 and 5.
In FIGS. 4 and 5, parts corresponding to those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, as shown in FIGS. 4 and 5, grooves 4 are provided in the step portions of the side walls of the cassette case halves 1a, 1b in the vicinity where the lids 2 are pivotally supported. At the outer edge of the opening of the groove 4, a sloped surface portion 4T that slopes outwardly is formed.

On the other hand, the end of the arm portion 2a of the lid 2 is extended so as to be always located within the groove 4. Furthermore, an inclined surface portion 5 facing the inclined surface portion 4T of the groove 4 is formed at the end edge portion of the arm portion 2a. Note that 6 is a return coil spring inserted through the rotation shaft 2b of the lid 2, and 6a and 6b are support pieces that support the coil spring 6, respectively. The rest of the structure is the same as that of the tape cassette shown in FIG. 1 above.

According to this configuration, when the lid 2 is rotated during recording or reproduction, the magnetic tape 3 is
is exposed, and recording or reproduction is performed via the exposed magnetic tape 3. When the lid 2 is rotated, the end of the arm portion 2a is attached to the cassette case 1.
When the lid 2 is about to come off from the cassette case 1, the end of the arm part 2a is pressed against the side wall of the cassette case 1 forming the groove 4, and the lid 2 is removed from the cassette. It is prevented from coming off from the case 1.

Also, even if the lid 2 is about to come off from the cassette cassette 1 due to a slight shock being applied to it during storage, the end of the arm 2a will not touch the side wall of the cassette cassette 1 as described above. This prevents the lid 2 from coming off the cassette case 1.

As described above, according to the tape cassette of this example, the lid 2 that protects the magnetic tape 3 protects the cassette cassette 1 when it receives a sharp impact or rotates.
Since it is possible to prevent the lid 2 from coming off, it is possible to obtain a tape cassette with a simple structure in which the lid 2 is difficult to come off. In addition, in this example, grooves 4 are provided in the side walls of the cassette case halves 1a and 1b, and the ends of the arm portions 2a of the lid 2 are extended, so that the cassette case halves 1a and 1b and the lid are extended. 2 can be easily molded using a mold. Furthermore,
Since the sloped surface portion 4T is provided on the side wall of the cassette case 1 constituting the groove 4, and the sloped surface portion 5 is provided at the end of the arm portion 2a of the lid 2, the end of the lid 2 can be positioned within the groove 4. This has the advantage that the tape cassette can be made smaller even if the tape cassette is made smaller.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

Effects of the Invention According to the tape cassette of the present invention, the lid 2 that protects the magnetic tape 3 can be prevented from coming off from the cassette cassette 1 when subjected to a sharp impact or rotated with a simple structure, and This makes it possible to obtain a tape cassette that can be easily molded.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a tape cassette equipped with a rotatable lid, FIG. 2 is a perspective view for explaining FIG. 1, and FIG. 3 is a sectional view of the main part of FIG. FIG. 4 is a perspective view showing a main part of an embodiment of the tape cassette of the present invention, and FIG. 5 is a sectional view of a portion corresponding to FIG. 4. 1 is a cassette case, 1a and 1b are each half of the cassette case, 2 is a lid, 2a is an arm part, 2b
is the rotation axis, 3 is the magnetic tape, 4 is the groove, 4T and 5
are respectively inclined surface parts.

Claims (1)

[Scope of Claim for Utility Model Registration] A tape cassette in which a lid 2 is provided on the front surface of a cassette cassette 1 so as to be rotatable in the vertical direction at arm portions 2a formed on both sides thereof, the cassette cassette A groove 4 is provided in a stepped portion corresponding to the arm portion 2a of the lid 2 in No. 1, and an inclined surface portion 4T that widens outward is formed at the outer edge of the opening, and the arm portion 2a of the lid 2 is A tape cassette characterized in that the tape cassette extends so as to be located within the groove 4, and has an inclined surface portion 5 formed at an end thereof to face the inclined surface portion 4T of the groove 4.