JPH04170779A - Tape cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape cassette applied to a so-called compact cassette or the like.

[Summary of the invention]

The present invention relates to a tape cassette, and tape-shaped recording.

The pad used to press the media onto the magnetic head is made of highly rigid,
By using a three-layer structure with low rigidity and high rigidity, or by using a stretchable member and supporting both sides with ribs provided on the cassette case, deformation of the pad can be prevented with a simple structure, and good recording can be achieved. This enables playback.

[Conventional technology]

For so-called compact cassettes, the following configuration is known, for example. That is, FIG. 7 is a perspective view, and FIG. 8 is an exploded view.
1) shows the cassette case as a whole, and this cassette case (1) is formed by combining an upper half (2) and a lower half (3). A pair of reel hubs (4a
) (4b) is stored. This tape-shaped recording medium T is then passed through guide posts (5a) (5b) and guide rollers (6a) (6b) to reel hubs (4a) (4).
b) This guide roller (6a)
(6b) so as to be exposed at the front opening (7) of the cassette case (1).

Furthermore, openings (7a) on both sides of the front side opening (7)
In the vicinity of (7b), there is a hole (8a) through which the tape-shaped recording medium T is transferred between the pinch rollers into which the capstan is inserted and thrust into the openings (7a) and (7b) during recording and reproduction. (8b), and inside the central opening (7c), a leaf spring (9 ) supported by a pad (1
0) is provided.

Also, inside the front side opening (7), there is the above-mentioned hole (8a).
Tape guide (lla) (Ilb) (Ilc) (lid) to prevent the tape-shaped recording medium T from becoming an obstacle when inserting a capstan into (8b), etc.
(lie) (llf) is provided. Although the tape guides (lle) (llf) are not shown, they are formed on the inner surface of the upper half (2).

In addition, S is a reel hub (4a) (4
These are friction sheets arranged above and below the winding surface of the tape-shaped recording medium T around b).

[Problem to be solved by the invention]

By the way, in the tape cassette mentioned above, the pad (10
) is made of felt, for example. In this case, the pad made of felt has poor flexibility and cannot sufficiently follow the arcuate surface of the magnetic head H when the magnetic head H is crimped as shown in FIG.
Non-uniformity such as A>B, C occurs in the pressure bonding force at each point.

Further, in the above-mentioned leaf spring (9), in order to allow the leaf spring (9) to flex, it is necessary to provide a margin at the fixing portions at both ends of the spring (9). In that case, while the tape-shaped recording medium T is running, the spring (9) and the pad (10) are moved against the tape-shaped recording medium T by the friction between the pad (10) and the tape-shaped recording medium T as shown in FIG. This may cause deviation in the running direction of the magnetic head H, resulting in an uneven pressure force on the magnetic head H.

If the pressing force is uneven in this manner, spacing loss and the like are likely to occur, and characteristics such as dropouts and output fluctuations are deteriorated.

This application was made in view of these points, and aims to prevent deformation of the pad with a simple structure and to perform good recording and reproduction.

[Means to solve the problem]

A first means according to the present invention is a pair of reel hubs (4a
) (4b) is housed in the tape cassette, and the tape-shaped recording medium to be transferred between these reel hubs is run through the front opening (7) of the cassette case. A pad (22) for pressing the tape-shaped recording medium, which is provided at a position where the magnetic head H enters during recording and reproduction of the front side opening, has high rigidity, low rigidity, and high rigidity in the running direction of the tape-shaped recording medium. This tape cassette is characterized by having a high three-layer structure (members (23a) to (23c)).

The second means includes a pair of reel hubs (4a) (4b) around which a tape-shaped recording medium T is wound in a cassette case (1).
The tape-shaped recording medium that is stored and transferred between these reel hubs is stored in the front opening (7) of the cassette case.
), a pad (22) for pressing the tape-shaped recording medium provided at a position into which the magnetic head H enters during recording and reproduction of the front opening of the cassette case; is a member (24) having elasticity in the direction of entry of the magnetic head, and
The tape cassette is characterized in that both sides of the pad in the running direction of the tape-shaped recording medium are supported by ribs (21) provided on the cassette case.

The third means includes a pair of reel hubs (4a) (4b) around which a tape-shaped recording medium T is wound in a cassette case (1).
The tape-shaped recording medium that is stored and transferred between these reel hubs is stored in the front opening (7) of the cassette case.
), a pad (22) for pressing the tape-shaped recording medium provided at a position into which the magnetic head H enters during recording and reproduction of the front opening of the cassette case; This tape cassette is characterized in that the pad is attached to a rib (21) provided on the cassette case, and a protrusion (21b) for preventing the pad from falling off is provided on the inner surface of the rib.

[Effect]

According to this, the pad for pressure-bonding the tape-shaped recording medium to the magnetic head has a three-layer structure of high rigidity, low rigidity, and high rigidity, or is made of an elastic member with both sides attached to the cassette case. By being supported by ribs provided on the body, deformation of the pad can be prevented with a simple structure, and good recording and reproduction can be performed.

[Embodiment] FIG. 1 shows the configuration of the main parts of a tape cassette according to the present application. In this figure, a square box-shaped rib (21) is formed on the cassette case (1) in place of the conventional leaf spring (9) and pad (lO), and this rib (21)
A rectangular parallelepiped pad (22) is fixed to.

That is, the rib (21) is formed, for example, in the shape of a square box with the front and top sides open, as shown in FIG. 2A. The lower part (21a) of this rib (21) is the pad (22).
) is formed thick so that it is arranged at a predetermined height, and a predetermined wave-shaped protrusion (21b) is provided on the inner surface of the rib (21) to prevent the pad (22) from falling off. It is being

In addition, an example of the pad (22) is shown in FIG.
Here, the pad (22) has a first layer made of a highly rigid member (23a), a second layer made of a less rigid member (23b), and a third layer made of a highly rigid member (23c). layer 3
It has a layered structure. As shown in FIG. 3C, the pads (22) are fixed to the ribs (21) so that three layers are lined up in the running direction of the tape-shaped recording medium T.

As a result, when the magnetic head H enters as shown in FIG. 3 during recording and reproduction, the pad (22) is compressed, and the tape-shaped recording medium T is pressed against the magnetic head H by the reaction of this compression. And in this case, pad (22)
Since the first layer and the third layer on both sides of the tape-shaped recording medium T in the running direction are made of highly rigid members (22a) (22c), this pad (22) is compatible with the tape-shaped recording medium T. The magnetic head H is not deformed by friction, and can always be properly pressed against the magnetic head H.

In this example, for example, the tip of the pad (22) is 5. Osm or less, and the tip of the rib (21) is within 3,35:::Hta-, which is the plunge limit of the magnetic head H.

Thus, according to the above-described device, the pad (22) for pressing the tape-shaped recording medium T onto the magnetic head H has a three-layer structure (members (23a) to (23) having high rigidity, low rigidity, and high rigidity).
c) With the above configuration, deformation of the pad can be prevented with a simple configuration, and good recording and reproduction can be performed.

Furthermore, FIG. 4 shows another example. In this figure, the pad (22) is formed of a stretchable member (24). In addition, the rear part (21c) of the rib (21) that fixes this pad (22) is extended to the reference plane (-dotted chain line) to fully utilize the elasticity of the member (24), and the rib (21) ) is set to a value as close as possible to the plunge limit of the magnetic head H, 3,35:::011 m.

Note that FIG. 5 shows a specific example of the pad (22) in this example,
The unit of numerical values in the figure is l. Further, in this example, the depth (5.0 mm) of the pad (22) is changed depending on the elasticity of the member (24).

Therefore, in this example, when the magnetic head H enters as shown in FIG. 6 during recording and reproduction, the pad (22) is compressed, and the tape-shaped recording medium T is pressed against the magnetic head H by the reaction of this compression. . In this case, the pad (22) is supported by ribs (21) on both sides in the running direction of the tape-shaped recording medium T.
22) is not deformed by friction with the tape-shaped recording medium T, and can always be properly pressed against the magnetic head H.

Thus, in this example as well, the pad (22) for pressing the tape-shaped recording medium T onto the magnetic head H is made of a stretchable member (24), and both sides of the pad (22) are provided with ribs (21) provided on the cassette case. ), the deformation of the band can be prevented with a simple configuration and good recording and reproduction can be performed.

Therefore, according to the configuration of the present application, since the leaf spring (9) is not required, parts and assembly processes can be reduced, manufacturing costs can be reduced, and the appearance of the cassette case can also be changed, improving marketability. It is possible to improve the

Furthermore, since the pressure force between the tape-shaped recording medium T and the magnetic head H is uniform, spacing loss and the like do not occur, and the possibility of deterioration of characteristics such as dropouts and output fluctuations can be eliminated.

Furthermore, since it is no longer necessary to use natural materials for the felt of the pad, manufacturing costs can also be reduced.

〔Effect of the invention〕

According to this invention, the pad for pressing the tape-shaped recording medium onto the magnetic head has high rigidity and low rigidity.

By having a highly rigid three-layer structure or by using a stretchable member and supporting both sides with ribs provided on the cassette case, deformation of the pad can be prevented with a simple structure and a good performance can be achieved. Recording and playback can now be performed.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the main parts of an example of a tape cassette according to the present invention, Fig. 2 is a diagram for explaining pads and ribs, Fig. 3 is a diagram for explaining the operation, and Fig. 4 is a diagram for explaining the operation. FIG. 5 is a line diagram for explaining the pad, FIG. 6 is a line diagram for explaining the operation, FIG. 7 is a perspective view of the tape cassette, and FIG. FIG. 8 is an exploded view thereof, FIG. 9 is an explanatory diagram of the relationship between the magnetic head and pads, and FIG. 10 is an explanatory diagram of the relationship between the magnetic head, pads, and leaf springs. (1) is the cassette case, (2) is the upper half, (3) is the lower half, (4a) (4b) is the reel hub, (5a)
(5b) is a guide post, (6a) (6b) is a guide roller, (7) is a front opening, (7a) to (7c)
are openings, (8a) (8b) are holes, (9) are leaf springs, (10) are pads, (lla) to (llf
) is the tape guide, (21) is the rib, (21a) is the lower part of the rib, (21b) is the protrusion, (21c) is the rear part, (22
) is a pad, (23a) to (23c) (24) is a member, T is a tape-shaped recording medium, S is a friction sheet, H
is a magnetic head.

Claims (1)

[Scope of Claims] 1. A pair of reel hubs on which a tape-shaped recording medium is wound are housed in a cassette case, and the tape-shaped recording medium transferred between these reel hubs is arranged in a front opening of the cassette case. In the tape cassette, the pad for pressing the tape-shaped recording medium is provided in the front opening of the cassette case at a position into which a magnetic head enters during recording and reproduction. A tape cassette characterized by having a three-layer structure of high rigidity, low rigidity, and high rigidity in the running direction of the recording medium. 2. A pair of reel hubs on which a tape-shaped recording medium is wound are housed in a cassette case, and the tape-shaped recording medium transferred between these reel hubs runs through a front opening of the cassette case. In the tape cassette made of A tape cassette, characterized in that both sides of the pad in the running direction of the tape-shaped recording medium are supported by ribs provided on the cassette cassette. 3. A pair of reel hubs on which a tape-shaped recording medium is wound are housed in the cassette case, and the tape-shaped recording medium transferred between these reel hubs runs through the front opening of the cassette case. In the tape cassette, a rib provided on the cassette housing is provided with a pad for pressing the tape-shaped recording medium, which is provided at a position into which a magnetic head enters during recording and reproduction of the front opening of the cassette housing. A tape cassette characterized in that the rib is attached to the tape cassette, and a protrusion is provided on the inner surface of the rib to prevent the pad from falling off.