JPH082863Y2 - Pad for magnetic tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pad for a magnetic tape cassette.

[Conventional technology]

The conventional magnetic tape cassette pad has a single-layered structure, and as its material, rabbit hair or wool called fur having a fiber thickness of about 15 to 20 μm is used.

[Problems to be solved by the device]

However, fibers such as fur and wool have non-uniform fiber surfaces when viewed macroscopically. When this is used as a pad and, for example, a stereo-recorded magnetic tape is played, the R channel (right channel) and L channel (left channel) are used. ), There is a high possibility that an output difference will occur. In addition, since the fiber is relatively thick, there is a drawback that the range of level fluctuation becomes large.

Further, as a result of the non-uniform fiber surface, the pad surface also becomes non-uniform, and a pressure difference may occur on the magnetic head surface that abuts via the tape.

Therefore, there is a drawback in that the magnetic head surface becomes uneven due to friction with the magnetic tape, and satisfactory performance as a magnetic head cannot be obtained.

Therefore, the pad has a thickness of 1.
It may be possible to use only ultrafine fibers of about 6 μm, but such fibers have poor flexibility, and so-called necessary head touch cannot be secured.

Therefore, an object of the present invention is to solve the above problems and provide a magnetic tape cassette pad in which the level fluctuation during recording / reproduction on a magnetic tape is reduced.

[Means and Actions for Solving the Problems]

In order to achieve the above object, the pad for magnetic tape cassette of the present invention is composed of two or more layers, and the flexibility of the material of the base layer closest to the pad supporting spring is higher than that of the surface layer made of ultrafine fibers. It is configured to be large.

Therefore, due to the action of the surface layer where the fiber surface is relatively uniform and the base layer that covers the lack of flexibility of the surface layer, a stable head touch (adhesion of the magnetic tape to the magnetic head) during recording and reproduction of the magnetic tape is achieved. Is obtained.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a pad spring having a pad according to an embodiment of the present invention.

In the figure, the pad spring 1 is basically composed of a pad spring 2 for supporting the pad and pads 3 attached to both ends thereof. The leaf spring 2 is bent in a substantially dogleg shape, and a pair of tip abutting portions 2a abutting against a stopper of a cassette half (not shown) and a leaf spring 2 protruding toward the side opposite to the side where the pad 3 is provided. A pair of protrusions 2b which serve as a pivot point,
It has a central support portion 2C supported by a cassette half (not shown).

Although not shown, when the magnetic head moves toward the pad 3 during recording or reproduction by the tape recorder, the magnetic head and the pad come into contact with each other via the magnetic tape, and the elastic force of the leaf spring 2 causes the magnetic tape to move to the magnetic head and the pad. Sandwiched between.

Here, the pad 3 has a two-layer structure. That is, the first layer, which is located on the leaf spring 2 side and is made of a relatively flexible material such as maltoprene or hard felt, forms the base layer 3a.
And a second layer that forms a surface layer 3b that is made of ultrafine synthetic fibers having a diameter of about 1.6 μm, such as polyester fibers.

The base layer 3a and the surface layer 3b are joined by a double-sided adhesive tape having a thickness of about 0.1 mm. Similarly, the base layer 3a and the leaf spring 2 are also joined by a double-sided adhesive tape.

Further, in this embodiment, the thickness of the base layer 3a is 1.2 mm, the surface layer 3
The thickness of b is about 0.8 mm.
Is thicker than the surface layer 3b. Further, the surface has a quadrangular shape, and the dimension along the longitudinal direction of the leaf spring 2 is set to 3 mm and the dimension in the direction perpendicular thereto is set to 5.3 mm.

FIG. 2 (a) shows a conventional pad in FIG. 2 (b).
FIG. 3 is a diagram showing the measurement result of the level fluctuation in the pad of the embodiment of the present invention, FIG. 3 (a) is a conventional pad, and FIG. 3 (b) is the measurement result of the phase fluctuation in the embodiment of the present invention. It is a figure which respectively shows. In these figures, the horizontal axis represents the time axis and one scale represents one minute.

To obtain these measurement results, a reproducing magnetic tape on which a 3 KHz reference signal was recorded was used, and the parts other than the pad, such as leaf springs, were the same.

As is apparent from FIGS. 2 and 3, the conventional tape (fur pad) and the pad (polyester fiber pad) of the embodiment of the present invention were used to reproduce the magnetic tape on which the reference signal of 3 KHz was recorded. The table below shows a comparison of the results of the cases.

In the above table, the level output indicates a value when 3 KHz and -10 dB are converted to a reference, that is, 0, and the phase fluctuation indicates a phase difference between the R channel and the L channel.

As is clear from the above results, according to the pad of the embodiment of the present invention, the surface layer in which the fiber surface is relatively uniform,
A stable head touch can be obtained at the time of recording / reproducing of the magnetic tape by the action of the base layer that covers the lack of flexibility of the surface layer, so that not only the level fluctuation but also the phase fluctuation becomes smaller than the conventional one.

Further, since the pad has a structure of two or more layers, the amount of relatively expensive ultrafine fiber material used can be saved, leading to cost reduction.

In the present embodiment, the pad having a two-layer structure has been described as an example, but an intermediate layer may be provided between the base layer and the surface layer to have a structure of three or more layers.

[Effect of device]

As described above, according to the magnetic tape cassette pad of the present invention, the head touch is improved, so that level fluctuations and phase fluctuations during signal recording / reproduction on the magnetic tape can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a pad spring having a pad according to an embodiment of the present invention, FIG. 2 (a) is a conventional pad, and FIG. 2 (b) is a level fluctuation in the pad of the embodiment of the present invention. FIG. 3 (a) is a diagram showing the phase variation in the conventional pad, and FIG. 3 (b) is a diagram showing the phase variation in the embodiment of the present invention. 3 ... Pad, 3a ... Base layer 3b ... Surface layer

Claims (1)

[Scope of utility model registration request] 1. A pad attached to a pad supporting spring arranged in a magnetic tape cassette, the pad being composed of two or more layers, and the flexibility of the material of the base layer closest to the pad supporting spring. Is a magnetic tape cassette pad characterized by being larger than the flexibility of the surface layer made of ultrafine fibers.