JPH06119747A - Pad for magnetic tape cassette - Google Patents

Abstract

PURPOSE:To obtain a pad which suppresses the increase of an error rate in connection with the pad to be provided on a tape cassette in which tapes capable of recording and reproducing digital information, such as music, are housed. CONSTITUTION:The pad 5 is constituted by impregnating a non-woven fabric of synthetic fiber having a density of >=0.5X10<3>kg/m<3> into synthetic resin. The material of synthetic fiber is rayon, nylon, polyester or teflon, while synthetic resin is urethane or teflon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cassette pad for accommodating a magnetic tape capable of recording and reproducing information such as music.

[0002]

2. Description of the Related Art FIG. 2 shows a sectional view of a conventional magnetic tape cassette in the vicinity of a pad. When the magnetic head 3 (hereinafter abbreviated as head) is inserted in the tape cassette,
A magnetic tape 4 (hereinafter abbreviated as tape) is pressed against the head 3 from the diamagnetic surface side with a pad 1 attached to a metal leaf spring 2 to stabilize the head touch of the tape 4 on the head 3 and record a signal. Makes the reproduction reliable and stable. The conventional pad 1 is composed of felt made of wool such as rabbit or sheep.

[0003]

As one means of digital recording / reproducing of music or the like, there is recording / reproducing of a digital signal by a fixed magnetic head (hereinafter abbreviated as head).
In such a digital recording / reproducing system, it is very important to secure a small error rate in the tape cassette in the sense that the original sound is faithfully reproduced. The tape cassette is equipped with a tape guide that slides on a magnetic tape (hereinafter abbreviated as tape). When the tape slides, shavings are generated from the tape guide, which adhere to the tape surface and cause an error rate. To increase. Since the density of the conventional pad is 0.4 × 10 ³ Kg / m ³ or less, it is difficult to supplement the shavings.
Further, when the conventional pad slides on the tape, the bristles of the pad are scraped on the diamagnetic surface side of the tape, and shavings are generated from the pad itself, or the bristles fall off from the pad.
When digital recording / reproduction is performed with a tape cassette using such a conventional pad, the error rate is 5 × 10 ^−3.
It became a big value, which was a fatal defect in product quality in digital recording and reproduction.

An object of the present invention is to provide a pad for a magnetic tape cassette which can catch and remove the shavings attached to the tape and which is not easily scraped by the pad itself sliding on the tape.

[0005]

In order to solve the above-mentioned problems, the magnetic tape cassette pad of the present invention has a density of 0.
Constructed by impregnating a synthetic resin non-woven fabric of 5 × 10 ³ Kg / m ³ or more with synthetic resin, and the synthetic fiber material is any one selected from rayon, nylon, polyester, and Teflon. It is characterized by that.

[0006]

With the structure of the present invention, since the synthetic fiber has good slidability with the tape, shavings will not be generated from the pad when sliding with the tape. Further, by impregnating the synthetic fiber non-woven fabric with the resin, the synthetic fiber does not drop from the pad by sliding with the tape. Moreover, since the density of the synthetic fiber is higher than that of the conventional pad, it becomes possible to supplement the shavings attached to the tape.

[0007]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view of the pad in this embodiment. The pad 5 is a layer in which a synthetic resin is impregnated with a synthetic fiber non-woven fabric, and is attached to the metal leaf spring 6 with an adhesive. The material of the synthetic fiber is rayon, nylon, polyester or Teflon, unlike the hair of sheep or rabbit, which is used for conventional pads.
Good slidability with tape. Therefore, the error rate is not increased because the tape is less likely to be scraped.

By using urethane as the synthetic resin to be impregnated, the pad itself can be made to have appropriate elasticity. Also, by using Teflon as the synthetic resin, it is possible to obtain appropriate elasticity and excellent slidability. As a result, when the pad comes into contact with the head, the pad can be freely deformed in accordance with the shape of the head to stabilize the head touch. Silicon may be attached to the pad surface to improve the slidability with the tape. The density of the synthetic fibers in the non-woven fabric layer is 0.5 × 10 ³ K
g / m ³ or more. The inventors of the present invention have found that if the density is lower than this, the effect of suppressing the increase of the error rate due to the pad is lost because there is no ability to capture the shavings.

After the pad of this embodiment was attached to a magnetic tape cassette and recording was performed at a recording signal frequency of 48 KHz,
As a result of measuring the error rate, in the tape cassette using the pad according to the present embodiment, the error rate is 2 × 1.
The value was 0 ^-5 , which was a very small value as compared with the error rate of the tape cassette using the conventional pad, and was at a level where there was no problem in product quality. based on the above results,
It can be seen that the pad of the present invention is less likely to be scraped by the tape and is less likely to generate shavings from the pad itself, so that an increase in error rate can be suppressed.

[0010]

As described above, according to the present invention, since it is difficult for the pad to be scraped by the tape and shavings from the pad itself are less likely to occur, it is possible to suppress an increase in the error rate, and as a result, the fixed head digital We were able to significantly improve the product quality of tape cassettes for recording and playback.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a tape cassette showing the vicinity of a conventional pad.

[Explanation of symbols]

 1, 5 Pads 2, 6 Metal leaf spring 3 Magnetic head 4 Magnetic tape

Claims (4)

[Claims] 1. A pad for a magnetic tape cassette, comprising a synthetic resin impregnated with a nonwoven fabric of synthetic fibers having a density of 0.5 × 10 ³ Kg / m ³ or more. 2. The magnetic tape cassette pad according to claim 1, wherein the synthetic fiber is any one selected from rayon, nylon, polyester and Teflon. 3. The magnetic tape cassette pad according to claim 1, wherein the synthetic resin is urethane. 4. The magnetic tape cassette pad according to claim 1, wherein the synthetic resin is Teflon.