JPH054145Y2 - - Google Patents

Description

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

[Conventional technology]

BACKGROUND ART Currently, a PCM recording and reproducing apparatus has been proposed that converts an analog signal such as an acoustic signal into a digital signal, such as a PCM signal, and records (or reproduces) the converted signal on a magnetic tape. Some PCM recording and reproducing apparatuses use a rotating head to achieve a relatively high recording density. Using this rotating head
In a PCM recording/reproducing apparatus, recording or reproduction is performed while the magnetic tape is pulled out from a cassette and wound around a rotating drum provided with a rotating head.

By the way, in the magnetic tape cassettes used in such PCM recording and reproducing devices, if fingerprints or dust get on the magnetic tape, dropouts will occur in the playback signal. Must be sealed within the tape cassette. In addition, the magnetic tape can be pulled out during recording or playback.
The cassette case requires space for inserting guides.

For this reason, conventional cassette cases are difficult to assemble and manufacture.
It consists of a combination of upper and lower cases, and is arranged on the outside of the lower half, and slides in the front and back directions of the cassette to open and close the space. Accordingly, magnetic tape cassettes have been proposed that have a rotatable front cover that covers the front surface of the cassette. When such a magnetic tape cassette is inserted into a recording/playback device, a slider that covers the bottom and part of the side surfaces of the cassette case slides backward, and then the front cover is rotated from the front of the cassette to open the cassette. The magnetic tape is exposed on the front side, and a space for inserting guides is provided on the back side of the magnetic tape. Furthermore, during storage, the magnetic tape is normally sealed with a closed slider, front cover, and cassette case.

[Problems that the idea solves]

In the conventional cassette case, as shown in FIG. 4, the upper half of the rear side of the cassette is formed by an upper case 11, and the lower half is formed by a slider 13 and a lower case 12, and this slider 13 has a concave surface for sliding. The lower case 12 has a stepped portion 12 ₁ at the rear of the lower case 12 on which the lower case 16 slides and whose surface is approximately the same height as the lower surface of the slider 13 .

However, when grabbing a cassette from a recording/reproducing device, if the deck is designed so that the slider closes, the user will often hold the cassette near the slider sliding concave portion 16, and the slider 13 will slide. This poses a problem in that the slider cannot operate smoothly. Furthermore, when trying to pull out a cassette from a recording/playback device, if the top and bottom surfaces of the cassette are grabbed, the slider is often grabbed and pulled out along with the stepped section at the rear, and the slider 13 is taken out without being closed and may be left as is. If dust gets inside,
Further, there is a problem in that it causes dust and fingerprints to adhere to the tape, which may cause signal dropout.

The present invention aims to eliminate these conventional problems, and when a user inserts and takes out a cassette into a recording/reproducing device, the user does not have to hold the slider or the slider sliding part, and can hold the upper case. It is an object of the present invention to provide a magnetic tape cassette which can be configured to hold the magnetic tape cassette so as to safely and reliably open and close the slider.

[Means for solving problems]

In the present invention, a cassette case 1 consists of an upper and lower case, and a slider 2 is slidably attached to cover a part of the bottom and side surfaces of the lower case.
In a magnetic tape cassette, a sliding surface part 3 that allows movement of the slider 2 and a stepped part 4 that stops the movement of the slider 2 on the sliding surface part 3 are formed at the rear of the bottom surface of the cassette case. A magnetic tape cassette characterized in that a finger hook 5 extends at the same height as the attaching portion 4, and an engagement notch 6 into which the finger hook 5 can be fitted is provided corresponding to the slider 2. be.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. The cassette case 1 is constructed such that an upper case 1 ₁ and a lower case 1 ₂ can be combined by screwing them together. ₁ has a transparent window (not shown) for checking the remaining amount of tape, and a slider 2 is attached to the lower case ₁₂ so that it can be opened and closed. (Fig. 1) A pair of reel hubs wrapped with magnetic tape are rotatably mounted inside the cassette case 1, and a front cover 7 can be opened and closed by rotating the front opening of the cassette case. It is pivoted to. The slider 2, which is slidably mounted so as to cover part of the bottom and side surfaces of the cassette case 1, is slidable by cutting off a part of the outer side of the rear part of the side wall ₂₁ , as shown in FIG. A recess 2 ₂ is formed, and this sliding recess 2 ₂ comes into sliding contact with the inner surface of a clamping wall 1 ₃ formed by extending a portion of the rear portion of the side wall of the upper case 1 ₁ downward.

The slider 2 is adapted to move onto a sliding surface portion 3 formed on the bottom surface of the lower case 1 ₂ , and has a stepped portion 4 formed at the rear of the lower case 1 ₂ at approximately the same height as the lower surface of the slider 2 . It's starting to get stopped. In this case, a finger hook 5 is extended from the stepped portion 4, and an engagement notch 6 into which the finger hook 5 can be fitted is formed in the slider 2 to correspond to the finger hook 5. The finger hook portion 5 is provided in the center position of the stepped portion 4 in the shape of a tongue protruding from the rear of the cassette toward the front.
It is preferable to form it in substantially the same or similar shape corresponding to the shape, and if necessary, a finger-holding part such as a recess ₅₁ or a circular hole is provided in the center. Note that the surface of the holding wall portion ₁₃ is preferably provided with a jagged surface to prevent slipping as a finger operation portion. In the figure, 20 is a hub regulating rib serving as a reel hub receiver, 21 and 31 are reel shaft insertion holes, 22 is a tape guide, 23 is a screwing projection, and 25 is an opening on the bottom of the case that is opened and closed by the slider 2.

During storage, the slide 2 at the bottom of the case is closed, and the front cover 7 is also closed, thereby stably sealing the magnetic tape inside the cassette case. When this cassette is loaded into the cassette deck, the slider 2 is moved back and opened, allowing the front cover 7 to be opened, and the side wall ₂₁ of the slider 2 is guided to move along the inside of the clamping wall ₁₃ , and is overlapped. The notch 6 of the slider 2 is fitted into the finger hook 5 extending to the stepped part 4 of the lower case ₁₂ , and the slider 2 is grasped when the top and bottom surfaces of the cassette are grasped. It is in a state where it can be pulled out by holding the finger hook 5 without any trouble.

[Effect of the invention] The present invention extends the finger hook part 5 to the stepped part 4,
By providing the slider 2 with an engagement notch 6 into which the finger hook 5 can be inserted, even if the top and bottom of the cassette case are grabbed when pulling it out from the cassette deck, the slider can be grabbed by grasping the finger hook and operating. The cassette can be pulled out without any problems, the tape can be protected from external dust without leaving the slider open, and the opening and closing operations of the slider can be performed stably and accurately.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the entire embodiment of the present invention as seen from the bottom side, Fig. 2 is a perspective view of the case in a separated state;
FIG. 3 is a bottom view, and FIG. 4 is a conventional oblique view seen from the bottom side. 1...Cassette case, 1 ₁ ...Upper case, 1 ₂
... lower case, 2 ... slider, 3 ... sliding surface section, 4 ... stepped section, 5 ... finger hook section, 6 ... notch section, 7 ... front cover.

Claims (1)

[Claims for Utility Model Registration] (1) A slider 2 is slidably attached to cover a part of the bottom and side surfaces of the cassette case 1;
In a magnetic tape cassette in which a sliding surface portion 3 that allows the slider 2 to move and a stepped portion 4 that stops the sliding of the slider 2 on the sliding surface portion 3 are formed at the rear of the bottom surface of the cassette case, the stepped portion 4
A magnetic tape cassette characterized in that the slider 2 is provided with a finger hook 5 extending therethrough and an engaging notch 6 into which the finger hook 5 can be fitted. (2) The finger hook portion 5 is provided in the center of the stepped portion 4 in the shape of a tongue, and has a recessed portion 5 ₁ in the center.
1. A magnetic tape cassette according to claim 1, which is equipped with the following. (3) The cassette case 1 has upper and lower cases 1 ₁ ,
1 ₂ , and a clamping wall 1 ₃ is extended on both rear side surfaces of the upper case to block the outer surface of the slider 2, and a part of the side wall of the slider 2 is overlapped with the inner side of the clamping wall 1 ₃ . A magnetic tape cassette according to claim 1 or 2 of the utility model registration claim, which is inserted into the magnetic tape cassette.