JPS60106087A - Tape cassette - Google Patents

Abstract

PURPOSE:To seal satisfactory a magnetic in repeated use with simple constitution without using another member by providing a connection piece at the cassette case side of an opening/closing cover, and a step controlling the operation of the connection piece on the front part of cassette case. CONSTITUTION:In storing a tape, an opening/closing cover 6 is rotated so that an opening 1a will be closed, and a magnetic tape 5 is sealed in a cassette case 1. At this time, a play end of connection pieces 12a and 12b abut to steps 14a and 14b in the reverse direction. As a result, shifting of the opening/closing cover 6 in the vertical direction is controlled, the cover is securely connected, and a dowel of the cover 6 is connected to a concave part 17. The cover 6 is stably connected so that it will not rotate carelessly at the position where the opening 1a is closed. In usage, the connection piece 12a is deflected to the side of the cover 6 by the 1st operation lever, and its play end is removed from the step 14a. Then by the 2nd operation lever the opening/closing cover 6 is rotated upward and brought into the opened condition.

Description

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

BACKGROUND ART AND PROBLEMS Currently, a PCM recording and reproducing apparatus has been proposed which converts an analog signal such as an acoustic signal into a digital signal, for example, a PCM signal, and records or reproduces the same. This PCM recording and reproducing apparatus 6 normally uses a tape cassette loaded with magnetic tape as a recording medium.

In PCM recording, when oil components such as fingerprints or dust adhere to the magnetic tape, there is a problem in that these oil components and dust cause dropouts of endogenous signals.

For this reason, a rotatable opening/closing lid is provided on the cassette case, and the opening on the front side of the cassette is closed by this opening/closing lid.
A device as shown in FIG. 1 has been proposed in which the magnetic tape exposed through this opening is sealed to prevent oil and fat components such as fingerprints and dust from adhering to the magnetic tape. That is, in FIG. 1, (1) indicates a cassette case, and this cassette case (1) is composed of a pair of cassette case halves (2) and (3) joined together by screws. (4a) and (4b) show the cassette case (winding frame part 1, which is rotatably fitted loosely in 11).
4b) is wrapped with magnetic tape (5+).(6)
The opening/closing lid (6) is provided so as to be rotatable toward the front side of the cassette, and this opening/closing lid (6) covers the front side of the cassette and closes the opening to seal the magnetic tape (5). The opening/closing lid (6) is made of elastic synthetic resin and has a substantially central portion curved toward the cassette case (1). (6a) and (6b) are arm portions that pivotally support the opening/closing lid (6) on the cassette case (1), respectively.

When this tape cassette is stored, the central part of the opening/closing lid (6) on the front side of the cassette is stretched by the cassette case (1), and due to the biasing force, it is accidentally rotated to a position that covers the front side of the cassette. It is fixed stably so that it does not move. During recording or reproduction, as shown in FIG.
6) is pushed and stretched by the upper surface of the cassette case (1) on the front side of the cassette, and the biasing force prevents it from inadvertently rotating at a position facing the upper surface of the cassette case (1). The magnetic tape (5) is exposed through the opening (1a) on the front side of the cassette. and,
When recording or reproduction is performed on the exposed magnetic tape (5) and the tape is stored, the operation is reversed to that described above.

Generally, tape cassettes are used repeatedly, but as shown in this tape cassette shown in Fig. 1, the opening/closing lid (6) itself is curved to give it elasticity.
Since the opening/closing lid (6) of the device that maintains its state in two rotational positions is made of synthetic resin, the biasing force when it is elastically deformed gradually weakens with repeated use, so it can be stored carelessly. There was an inconvenience that it rotated.

In view of this, the devices shown in FIGS. 3 to 8 have previously been proposed as devices that can seal magnetic tapes well even after repeated use.

That is, in the example proposed above, as shown in FIGS. 3 and 4, there are two locations near the left and right arm portions (6a) and (6b) of the opening/closing lid (6) on the cassette case (1) side. Elastic table b consisting of two plates (7a) and (7b) each
(7) shall be provided. In this case, the two plates (7a),
The longitudinal direction of the husband (7b) is parallel to the vertical direction of the front surface of the cassette, and these two leaf springs (7a), (7b)
) are arranged in a straight line parallel to the vertical direction of the front of the cassette with an interval large enough to allow insertion of the dowel of the cassette case (1), which will be described later.
The upper ends of the plate springs (7a) of 0 are each fitted into the opening/closing lid (6), for example, and attached, and the other ends of each are curved toward the cassette case (1).

On the other hand, as shown in FIGS. 3 and 5, the upper and lower corners of the cassette front side of the cassette case (1) corresponding to the elastic portion (7) of the opening/closing lid (6) have curved surfaces. The curved part of (
8).

In addition, (9) indicates four circular parts provided at the vertical center of the front surface of the cassette corresponding to the elastic part (7) of the opening/closing lid (6) on the front side of the cassette. When the lid (6) closes the opening (1a) on the front surface of the cassette, the elastic portion (7) of the opening/closing lid (6) engages. In addition, 00) is a cylindrical dowel provided at the center of the recess (9), and this dowel (00) is a cylindrical dowel provided at the center of the recess (9). The elastic part (engages between the two leaf springs (7a) and (7b) that constitute the force. Furthermore, α
D is an elastic part (the upper surface of the cassette case (1) corresponding to the position of force and a circular recess provided on the lower surface.Other structures are the same as those shown in FIGS. 1 and 2.

The operation of the tape cassette constructed in this way will be explained.

First, during storage, σ11<open/close lid (shown in Figure 6).
6) closes the opening (la) in the front of the cassette and seals the magnetic tape (5) inside the cassette case (1).

In this case, the ends of the two plates (7a) and (7b) on the cassette case (1) side are located in the recess (9), and the dowel 00) is engaged between these ends. For this reason, even if the opening/closing lid (6) attempts to rotate upward or upward, the two leaf springs (
7a).

(7b) is in abutment with die l-' (101), so that the opening/closing lid (6) cannot be rotated. Part (1
a) is stably locked in the closed position to prevent accidental rotation.

During recording or playback, as shown in FIG. 7b)
is bent toward the opening/closing lid (6), and the lower plate springs out (7b2).
Ga-da, 3? (10). The lid rotating member S rotates the opening/closing lid (6) upward as shown by the dashed line in FIG.
bends along the curved surface portion (8). In this case, the leaf spring (7a), (
7b) produces the largest biasing force, and beyond this intermediate position, the opening/closing lid (6) itself attempts to rotate in the direction beyond which the biasing force becomes smaller. As it is further rotated, the plate springs out (7a) as shown by the actual # in FIG.

(7b) is the position where it engages with the recess (Ill), that is, the opening/closing lid (
6) is located on the upper surface of the cassette case (1),
The magnetic chip f (5) is exposed at the opening (1a) on the front side of the cassette. In this case, the biasing force of the leaf springs (7a), (7b) is smaller when the leaf springs (7a), (7b) engage with the recess (Ill) than when they contact the curved surface part (8). Therefore, when the plate springs (7a) and (7b) engage with the recess (former), they engage with a click feeling.

If the exposed magnetic chip f(5) is to be put into a storage state after being recorded or reproduced, the operation opposite to the above is performed. In addition, in the above, the opening/closing lid (
Although only the case where 6) is rotated upward has been described, the same operation as described above can also be performed when it is rotated downward.

As described above, according to this example, the biasing force due to the deflection of the two plates (7a) and (7b) made of phosphor bronze, for example,
Due to the engagement by the two leaf springs (7a), (7b) and the dove (10), the opening/closing lid (6) keeps the opening (la) in the front of the cassette closed. The opening (1a) in the front part of the cover set does not hold the opening/closing lid (6) even after repeated use, compared to the case where the opening/closing lid (6) is made of resin and maintains a predetermined rotational position due to its own elasticity. The simple structure allows the magnetic tube (5) to be sealed well even after repeated use, and the opening/closing lid (6) does not rotate inadvertently even when a relatively large force is applied. You can get what you never had.

However, in the examples shown in FIGS. 3 to 8, the opening/closing lid (6) is equipped with other members such as plate plates (7a) and (7b).
, the structure is relatively complicated and expensive, and the shape is relatively large.

OBJECTS OF THE INVENTION In view of the above, an object of the present invention is to provide a magnetic tape that can be sealed well even after repeated use with a simple structure without using any other parts.

SUMMARY OF THE INVENTION The present invention provides a cheats cassette equipped with a rotatable opening/closing lid that opens and closes an opening provided on the front face of the cassette cassette. A stepped portion for regulating the movement of the cassette case is provided on the front surface of the cassette case, and according to the present invention, the opening/closing lid can be moved by the holding piece of the opening/closing lid and the stepped portion of the cassette cassette. It is possible to obtain a magnetic tape that can be locked and can be sealed well even after repeated use with a simple structure without using any other parts.

EXAMPLE Hereinafter, an example of the cheats cassette of the present invention will be described with reference to FIGS. 9 to 14. This figure 9 to 14
In the figures, parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals &i, and detailed explanation thereof will be omitted.

In this example, Figures 9, 10, 11 and 12 are used.
As shown in the figure, a retaining piece (1
2a) and (12b) are provided. In this case, the binding piece (12
a) and (12b) are provided 180 degrees symmetrically on the left and right as shown in FIGS. 9, 10, and 11. That is, this holding piece (
12a) and (12b) are shown in Figures 10, 11, and 12.
As shown in the figure, it is constructed by integral molding with the opening/closing lid (6) made of synthetic resin, and has a tongue shape that is erected diagonally above and diagonally below the lower and upper sides of the opening/closing lid (6). Its length is such that its free end comes into contact with the joint of the cassette case halves (2) and (3) when the opening/closing lid (6) is closed.

On the other hand, the force set box (11 includes figures 9, 10 and 1)
As shown in Fig. 1, the retaining pieces (12a) and (12b) move in response to the rotation of the opening/closing lid (6). ) are formed with guide grooves (13a) and (13b).
Steps (14a) and (14b) are provided at the joints of the cassette case halves (2) and (3) of 13a) and (13b), respectively. In this case, the stepped portions (14a) and (14b) are oriented in opposite directions, that is, the stepped portion (14a) is oriented downward so that the free end of the engagement piece (12a) comes into contact with it, as shown in FIG. 14b) is oriented upward so that the free end of the engagement piece (12b) comes into contact with it, as shown in FIG.

In addition, in this example, as shown in FIGS.
) A cylindrical dowel (I51) is provided at the center slightly inside of each.

On the other hand, as shown in FIGS. 9, 13, and 14, the front surface of the cassette case (1) is A substantially cylindrical curved surface portion (161) is provided on each of the surfaces.

In Figs. 9, 13, and 14, (171 indicates a circular recess provided in the vertical center of the curved part (161) on the front side, and the recess (17) has an opening/closing function. lid(
6) closes the opening (1a), the dowel (151) of the opening/closing difference (6) engages. There are four circular parts for retaining the dowels provided on the top and bottom parts of the cassette case (1) corresponding to the position of the date when rotated. (1 bell is the curved part (161) Recess (171 and recess 0
It shows the grooves between the barrels. The depth of this groove 11 is set so that the end of the dowel (151) does not come into sliding contact when the opening/closing lid (6) is rotated. Configure in the same way as .

``According to Karuchikaset, the first
As shown in Figure 0, Figure 11 and Figure 13, the opening/closing lid (6) is rotated to close the opening (1a), and the magnetic tape (
5) is sealed within the cassette case (1). At this time, the free ends of the retaining pieces (12a) and (12b) abut against the steps (14a) and (14b), respectively, in opposite directions as shown in FIGS. 10 and 11, thereby opening and closing the The vertical movement of the lid (6) is regulated, the opening/closing lid (6) is securely locked, and at this time, the dowel (151) of the opening/closing lid (6) is inserted into the recess (
171, and the opening/closing lid (6) is stably locked in the position where the opening (1a) is closed so that it will not rotate inadvertently.

During use, as shown in FIGS. 10 and 14, in the recording/reproducing device, the first operating rod (20a) provided at a predetermined position of the cassette case (1) is connected to the engagement piece (12a).
Flex it toward the opening/closing lid (6) side, remove the free end of this engaging piece (12a) from the stepped part (14a), and then turn the second actuating rod (2
0b) Rotate the opening/closing lid (6) upward to open it. In this case, the free end of the retaining piece (12b) can be easily rotated upward as shown in FIG. Also, at this time, the dowel 05) of the opening/closing lid (6) is attached to the cassette case (1).
The opening/closing lid (6) is engaged with the Q mark on the top side of the four parts, and the opening/closing lid (6) is stably locked in this position so that it does not rotate unexpectedly. Also, when opening the opening/closing lid (6) in the opposite direction, use the engaging piece (12).
b) The free end and the stepped portion (14b) are released in the same manner as described above, and the opening/closing lid (6) is rotated with ease. Recording and reproduction, etc. are performed in this state.

Other effects in this example are the same as those in FIGS. 1 and 2.

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

Effects of the Invention According to the tape cassette of the present invention, the tape cassette is equipped with a rotatable opening/closing lid (6) for opening/closing the opening (la) provided in the front part of the cassette case (1). Since the opening/closing lid (6) is locked by the retaining piece provided integrally with the lid (6) and the step provided on the cassette case, the opening/closing lid (6) remains secure even after repeated use. Can be stopped. Further, according to the present invention, since other parts such as leaf springs are not used, the structure is simplified and the cost is reduced accordingly, and since no separate members are used, the shape does not become large.

[Brief explanation of the drawing]

1 and 3 are perspective views showing examples of tape cassettes each having a rotatable opening/closing lid, FIG. 2 is a perspective view for explaining the operation of FIG. 1, and FIGS. 4 and 5 are FIG. 3 is a route map for explaining the operation, FIG. 6, FIG. 7 and FIG. 8 are cutaway sectional views for explaining the operation of FIG. Diagram for explanation, 1st
0, 11, 13, and 14 are enlarged cutaway sectional views showing examples of the main parts of Fig. 9, respectively, and Fig. 12 is a cutaway perspective view showing an example of the main parts of Fig. 9. . (1) is the cassette case, (1a) is the opening, (5) is the magnetic tape, (6) is the opening/closing lid, (12a) and (12b)
(14a) and (14b) are respective step portions. 111□h. Agent Im Kai・-1゛1・. Figure 4 M ftl Figure 11 Missing 1 Figure B

Claims (1)

[Claims] In a tape cassette provided with a rotatable opening/closing lid that opens and closes an opening provided on the front part of the cassette case,
A tape cassette characterized in that an engaging piece is provided on the side of the cassette case of the opening/closing lid, and a stepped portion on the front face of the cassette case that restricts the operation of the engaging piece.