JPS63271785A - Magnetic tape cassette - Google Patents

Abstract

PURPOSE:To improve the low vibration performance, running performance and durability of a magnetic tape cassette, by using a multi-layer structure containing an outer layer made of a material of high rigidity and an inner layer made of a vibration absorbing material of low resonance sharpness. CONSTITUTION:An outer layer 1 of a shell uses a material of high rigidity to secure mechanical strength and an inner layer 2 uses a vibration absorbing material of low resonance sharpness to absorb or attenuate the vibration transmitted from the outside of a magnetic tape cassette. Thus the undesired vibrations of a motor, an incorporated speaker, etc., are absorbed by said vibration absorbing material of low resonance sharpness. Then the mechanical strength is secured by a material of high rigidity of the layer 1. Thus the desired low vibration performance, running performance, durability, etc., are satisfied for a magnetic tape cassette.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape cassette, and more particularly to a magnetic tape cassette in which the shell of the magnetic tape cassette has a multilayer structure.

[Summary of the invention]

The present invention provides a magnetic tape cassette with an outer layer 1 of a shell.
and inner layer 7!2 are each made of a high-rigidity material and a vibration-proofing material with low resonance sharpness, and furthermore, the shell outer layer 1 is made of an outermost layer 4 made of a wear-resistant material, and the shell inner layer is A magnetic tape cassette consisting of a multilayered shell with an innermost layer 3 made of a material having a low coefficient of friction added to the shell, which improves the performance of the magnetic tape cassette, such as low vibration, running properties, and durability. It is.

[Conventional technology]

In conventional magnetic tape cassettes, for example, as shown in Figure 4, the shell is often made of a single material, and even in cases where multiple materials are used, the shell is divided into a window and main part, or the shell surface is It was common to rely on a combination of two materials, such as coating with another material, such as a coating or printing ink. Therefore, there has been no effective improvement in the performance of the magnetic tape cassent from the shell structure perspective, such as low vibration.

[Problems to be solved by the present invention]

Therefore, in order to faithfully record and reproduce audio using a magnetic tape center, it is necessary to improve characteristics such as level fluctuations and wow and flutter. The magnetic tape characteristics are also influenced by the performance of the magnetic tape cassette. Examples of this performance include low vibration, running performance, and durability. The performance of the magnetic tape cassette is also affected by the shell material and the cassette shape. Therefore, it is desired to improve the material and shape of the shell, but there are dimensional restrictions on the cross-sectional thickness of the shell of the magnetic tape cassette, making it difficult to improve the shape. Focusing on the material, it was found that it was extremely difficult to satisfy all the performance requirements of a cassette with a shell made of a single material, such as the shell of a conventional cassette.

[Means for solving problems]

Therefore, the present invention makes the main structure of the shell a multilayer structure, further adds the innermost layer 3 and the outermost layer N4 of the shell, and uses materials with optimal characteristics for each layer, thereby improving the characteristics of the magnetic tape cassette. [Operation] According to the present invention, the physical properties of the materials constituting each layer have the low vibration and vibration properties required for magnetic tape cassettes. Satisfies performance such as running performance and durability. That is, by configuring the inner N2 with a vibration isolating material with a low resonance sharpness, undesired vibrations transmitted from the outside of the magnetic tape cassette, such as motor vibrations and vibrations of the built-in speaker, can be prevented. The vibration is absorbed by the vibration isolating material, the high rigidity material provided on the outer layer N1 provides mechanical strength, and the low friction material placed on the innermost layer 3 improves the running properties of the tape, and the outermost layer 4 Durability is improved due to the wear-resistant material placed on the surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are examples of multilayer shells according to the invention. The outer layer 1 of the shell is made of a high-rigidity material to maintain mechanical strength, and the inner layer 2 is made of a vibration-proofing material with low resonance sharpness to absorb or attenuate vibrations transmitted from the outside of the magnetic tape cassette. . Table 1 shows examples of combinations of materials for outer layer 1 and inner layer N2.

However, PP means polypropylene]-gold.

Figure 3 shows the outermost layer 4 in the shell of the basic configuration shown in Figure 2.
It is a multilayer shell having a wear-resistant layer formed by electroless nickel plating, for example, and a low-wear material layer coated with Teflon or a Teflon sheet as the innermost layer 3.

〔effect〕

According to the present invention, vibration is prevented by the high-rigidity, low-resonance-sharp vibration-proofing layers provided on the outer layer I and the inner layer 2 of the shell, and stable running is achieved by the low-friction layer provided on the innermost shell N3. The low-wear, high-hardness layer provided on the outermost layer 4 allows protection of the outer layer. Therefore, level fluctuations, wah
By improving the characteristics such as flutter, it is possible to improve the sound quality.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view including a partially cutaway shell sectional view of a magnetic tape cassette according to the present invention, and FIG. 2 is a sectional view of a shell of a two-layer structure of a magnetic tape force center according to the present invention. FIG. 3 is a sectional view of the basic structure of FIG. 2 provided with an outermost layer and an innermost layer. FIG. 4 is a sectional view of a shell in a conventional magnetic tape assembly. 1------1 outer layer 2--1--Inner layer 3------1 Innermost layer 4-----1 Outermost layer Sterilization diagram Figure 2 Part 3 Figure 4

Claims (2)

[Claims] (1) A magnetic tape cassette that stores a magnetic tape in a pair of upper and lower shells, which has a multilayer structure in which the outer layer of the shell is made of a highly rigid material and the inner layer of the shell is made of a vibration-proofing material with low resonance sharpness. A magnetic tape cassette consisting of (2) The magnetic tape cassette according to claim 1, further comprising a layer made of an abrasion-resistant material on the outermost layer of the shell;
A magnetic tape cassette consisting of a multilayer shell with a layer made of a material with a low coefficient of friction formed on the innermost layer of the shell.