JPS6323201A - Damper structure for audio cartridge - Google Patents

Abstract

PURPOSE:To faithfully transmit the oscillation, which a stylus tip acquires, to the rear by loading a plate-shaped damper with the stylus pressure. CONSTITUTION:Holding parts 6 whose part just above the stylus tip is joined to the upper rear face of a cantilever 2 and other part is separated from the cantilever 2 and rear part is joined to a case 5 are formed with materials having a spring property like a steel or a carbon material, and the function as a damper is given to these parts 6. The cantilever 2 is supported at two points like fulcrums 7 on the section so that the cantilever 2 can be freely moved. Since the load applied to a stylus tip 1 is supported by the plate-shaped damper 6, the oscillation from the stylus tip 1 is transmitted to the rear without distorting the cantilever 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Problems with the Prior Art) In audio cartridges, a rubber material has conventionally been used as a damper that functions to return force/tilt vibration to the center.

However, rubber had the disadvantage of slow recovery speed, the problem of natural deterioration of rubber due to long-term storage, and the disadvantage of hardening in cold weather, all of which had a negative effect on the characteristics of the cartridge.

In addition, in the past, the rubber damper itself was the fulcrum for the force/tile lever and was designed to grip and fix the force/tilever, so the load applied to the needle tip caused the force/tilever to swing out. This had a great effect on the distortion and sound characteristics.

Various studies have been conducted on the material of the cantilever as a measure against this strain. Some materials were used, such as beryllium steel pipes and full diamond, in order to create lightweight and unyielding materials, but these were difficult to avoid due to the problem of distortion.

No matter how high-quality and high-quality amplifiers and speakers are used, satisfactory playback will not be possible unless the vital vibrations from the needle tip are faithfully transmitted, and this has been the focus of research in the industry. .

(The shortcomings that the present invention attempts to solve) In order to solve the above problems, the present invention eliminates the use of rubber dampers, improves the shape and material of the damper, and the structure of the cantilever. The idea is to faithfully transmit the vibrations captured by the tip of the stylus from the sound groove of the record to the rear without any distortion of the cantilever.

(Example) Next, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a diagram showing the relationship between a conventional rubber damper (3) and a cantilever 2).
was made into a plate-shaped damper (6) as shown in FIG.

In the embodiment shown in FIG. 2, only the part directly above the tip of the needle is connected to the cantilever (2) at the upper rear position of the cantilever (2), and the rest is provided apart from the cantilever (C2),
At the rear part, the holding part (6) connected to the case (5) is made of a material with spring properties such as a hook or carbon material, and is given the function of a damper. Further, in the cross-sectional shape, the cantilever (2) is supported at two points, such as the fulcrum V) in FIG. 2, so that the cantilever (2) can move freely.

As a result, the load applied to the needle tip (1) is supported by the plate damper (6), so that vibrations from the needle tip (1) are transmitted to the rear without distortion of the cantilever Q).

In addition, by making the shape of this plate-shaped damper (6) into a plate-shaped one that becomes wider from the needle tip to the base as shown in Figure 3, tracking errors in the sound groove near the center of the record can be prevented. be able to.

In addition, as shown in FIG. 4, by providing a fine adjustment screw for adjusting the tension of this plate-shaped damper (6), the tension strength can be adjusted.

(Effects of the Invention) As a result of the above, the problems caused by natural deterioration of rubber and the problems of cold hardening compared to cartridges using conventional rubber dampers have been solved, and the characteristics of the cartridge can be maintained semi-permanently. I am now able to perform.

In addition, conventional cantilevers were made of highly rigid materials to prevent distortion, so they could be used to detect the faintest parts of the unevenness in the sound grooves of records, such as the whisper of a human voice.

It was difficult to faithfully reproduce sounds such as those in which the lingering sound gradually faded away.

However, in the present invention, the stylus pressure is applied to the plate-shaped damper (6), so the elasticity of this damper allows the stylus tip to closely trace the sound groove of the record. As a result, even the slightest unevenness carved into the sound groove can now be picked up faithfully by the stylus tip. And cantilever (2)
Since the needle can move and vibrate freely without distortion, it is now possible to faithfully transmit the vibrations captured by the tip of the needle to the rear.

As a result, listeners can now listen to a more realistic sound quality that gives them the feeling that they are listening to the playback of a record.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the shape and structure of the damper and cantilever of a conventional cartridge, where (1) is the needle tip, (
2) is a cantilever, (3) is a rubber damper, (4)
represents a magnet or coil, and (5) represents a cantilever case. FIG. 2 shows a sectional view of the principle of the present invention, and (6) is a plate-shaped damper. V) is the cantilever 12
) is supported at two points, upper and lower, in the cross-sectional view, and the cantilever c is shown to be able to move freely. FIG. 3 is a diagram showing that the width of the plate-shaped damper (6) becomes wider toward the base, and the plate-shaped damper (6) is positioned directly above the needle tip, and FIG. 6 is a diagram showing how the rear case (5) is joined at two places. FIG. 4 is a sectional view for explaining the adjustment screw (8) f for finely adjusting the tension of the plate damper (6) in the embodiment. Patent applicant: Muramatsu Metal Industry Co., Ltd. (and one other person) Engraving on page 1 (no changes to the content) 4th whistle diagram procedural amendment August 3, 1986

Claims (1)

[Claims] A cartridge damper that allows the cantilever to move freely by supporting the stylus pressure on a plate-shaped damper installed on the upper back surface of the cantilever, and supporting the vibration fulcrum of the cantilever at two points in cross-section. and cantilever structure.