JPS5932004Y2 - record player - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a record player, and its purpose is to increase the anti-vibration effect with a simple configuration.

Howling is generally cited as a problem that hinders the performance of record players.

In recent record players, we have not seen anything extremely malicious, such as howling, which is a sustained sound that starts at a certain point when the volume of the playback speaker is increased, but it does not lead to howling! However, it seems that there are quite a few that are having the problem of unstable playback sound quality due to deterioration of the frequency characteristics of the record playback signal or deterioration of the S/N ratio.

This problem can be solved by completely vibrationally isolating the space between the record player case and the floor to which external vibrations are transmitted, increasing the vibration isolation properties of the player case. Efforts have been made to improve the anti-vibration properties of record players, so-called housing margins.

There are various types of these conventional vibration isolators, such as those that combine a rubber cushion with air-metal sealing inside and a felt plate, and those that combine a coil spring and a rubber body. Although it has been improved, there are many things that still have room for improvement.

In particular, when increasing the vibration-proof properties of record players, one problem that arises is that the player case is placed vertically to the floor due to the structure in which the vibration-proof device is interposed between the player case and the floor. At the same time, it becomes easier to move horizontally and in the rotational direction.

In other words, the vibration isolator is movable in any of the vertical, horizontal and rotational directions.

The fact that the vibration isolator can easily move in the vertical direction is an essential condition in order to ensure that external vibration noise transmitted through the floor metal is absorbed by the vibration isolator and not transmitted to the player case. If the shaking device moves easily in the horizontal direction, the player case will swing greatly in the direction of rotation of the turntable when starting the turntable, causing a temporary S/N problem.
Various problems arise, such as deterioration of the ratio and the phenomenon of needle skipping of the pickup cartridge.

Particularly for record players in which the turntable's starting torque is increased so that the rotational speed of the turntable does not change depending on the magnitude of the stylus pressure, etc., the above problem must be solved in order to improve the quality of the player. be.

The present invention takes into consideration the various problems encountered in the prior art, and provides a new record player that has a simple structure and can be used to improve howling machines at low cost.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the external appearance of a record player according to an embodiment of the present invention, in which a bottom case 4 is attached to a player base 3 that supports a turntable 11, a pick amplifier 2, etc.
In order to support the overall sound, vibration isolators 5 are attached to the four corners of the lower surface of the base body 3 through penetrating metal provided in the bottom case 4.

To put it simply, the vibration isolator 5 is constructed by combining a metal bellows, an elastic body such as rubber, and metal.

Due to its shape, the elasticity of metal bellows can be controlled as desired, just like a conventional coil spring.Moreover, its load resistance and reliability are equal to or better than springs, and what's more, it has a pure enclosed space metal inside. It has the property of being able to form.

Furthermore, the metal bellows has a directional characteristic in its expansion and contraction, and has the property of being easy to move in one direction, but difficult to move in a direction perpendicular to the above direction.

The vibration isolating device 5, which is a combination of such a metal bellows and an elastic body such as rubber, efficiently absorbs external vibration sound due to the elasticity of the metal bellows and the elasticity of rubber, etc. This prevents the vibration of the player case when starting the turntable by using the hard-to-move sound, and provides a high-quality record player with a high howling machine as a whole.

A specific example of the structure of the vibration isolator 5 will be explained with reference to FIG. 2 and subsequent drawings.

In the case shown in FIG. 2, a plate 7 made of an elastic material such as rubber is attached to the lower end opening of a bottomed cylindrical metal bellows 6 having a covering part 6ae on the outer periphery by integral molding of metal. The mounting screw is screwed into the lower surface of the 8-karat gold base 3 from the center hole 7a through the transparent key provided on the upper surface 6b of the bellows 6.
It was done.

The bellows 6 is formed by press molding using an extremely thin metal sheet metal mold with a thickness of several microns.

Note that gold such as felt may be further pasted on the lower surface of the plate 7.

Next, the one shown in FIG. 3 is attached to the upper and lower end openings of a cylindrical metal bellows 6 by integral molding to a plate 7' made of rubber or the like, so that the base 3 and the floor on which the player is placed are connected. It has improved vibration isolation characteristics and sound.

The one shown in Fig. 4 is a cylindrical metal bellows 6 whose lower surface has a pure transparent gold hermetic structure, and a coating layer of 9 gold is provided on the outer surface of the bellows 6, which is attached by integral molding or bonding with an elastic metal such as rubber. It is designed so that the elasticity of the metal bellows 6 and the elasticity of the covering layer 9 can be fully utilized for vibration absorption.

The one shown in FIG. 5 is a modified version of the one shown in FIG.
In addition to the mold shape, the air sealed within the space 10 was also actively utilized for vibration absorption.

Furthermore, the one shown in FIG. 6 has the above-mentioned plate 7' on the upper and lower surfaces of the metal bellows 6, which has a pure hermetic structure with minute holes made of 11 gold metal on the lower surface.
Further, the bellows 6 is attached to the plate 7' on the upper surface side to the base body 3 four times, and an air permeable felt plate 12 is attached to the lower surface of the plate T on the lower surface side.

According to this, when the air sealed in the bellows 6 passes through the hole 11, a large resistance is generated, and by changing the size of the hole 11, the resistance can be arbitrarily controlled. Any amount of braking sound can be applied to the elastic force.

Fig. 7 is made with the same purpose as Fig. 6, in which viscous oil such as silicone oil is injected into an oil pot 13 fixed to the outer circumference of the lower end of the bellows 6. The oil 14 is in the through hole 1 of the bellows 6.
This is used to dampen the resistance 4 elastic force when passing a gold coin.

The frequency characteristics of the record player using the vibration isolator sound shown in Figures 2 to 7 are as shown by curve a in Figure 8, and the response frequency of the button to the resonance is higher than the characteristic curve of a general record player. It can be made significantly smaller.

Therefore, it is advantageous in terms of the needle skipping phenomenon and deterioration of the S/N ratio.

By the way, in each of the above embodiments, the main purpose is to block the vibration transmitted sound between the player and the floor on which the player is placed, but in order to increase the howling margin 4, it is important to prevent the sound from being transmitted directly to the atmosphere. Sufficient measures must also be taken against external vibrations applied to the pickup and the like.

A fourth embodiment based on this viewpoint is shown in FIG. 9.

In the case shown in FIG. 9, the player base 3 and the bottom case 4 are separated and independent, and the base 3 is placed on the screen 15 through the first vibration isolator 5, and the bottom case 4 is mounted on the first vibration isolator 5. It is supported by a second vibration isolator 5' placed on top of the vibration isolator 5'.

A turntable drive motor 16 is mounted on the bottom case 4 with a second metal pickup, and these motors 16
The pickup 2 and the like are configured so as not to come into contact with the base 3.

Therefore, even if not only vibrations transmitted from the floor but also external vibrations are applied to the base 3, the pickup 2 is vibrationally suspended from the base 3 by the vibration isolator 5', so the above vibrations are effectively suppressed. Absorbed.

The structure of the above-mentioned vibration isolator part is as shown in Fig. 10.
A metal bellows 6 is attached above and below a plate 7 attached to the lower end of the bellows 5, and a plate 7 is further attached to the end of the bellows so that the bellows can be placed on the floor or supported by the bottom case 4. .

The frequency characteristics of the player with such a configuration are as shown by the curve a in Fig. 8, and the vibration transmission characteristics are greatly improved compared to the conventional player. Since the case 4 is separated from the base 3, its influence on frequency characteristics is greatly reduced.

As explained above, the record player of the present invention uses a vibration isolating device that combines metal bellows and four elastic bodies such as rubber, so it has elasticity in the vertical direction and movement in the horizontal nine rotation directions. The synergistic effect of the properties of the metal bellows, which are free of vibrations, and the properties of elastic materials such as rubber, makes it possible to effectively absorb vibration sounds in all directions, thus reducing not only external vibrations but also the vibrations that are applied to the player itself when the turntable is started. It also reliably absorbs vibrations in the rotational direction and prevents needle skipping and S/H deterioration.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a record player according to an embodiment of the present invention, FIGS. 2 to 7 are side sectional views showing the structure 4 of the vibration isolating device of the player, and FIG. 8 is a frequency characteristic diagram of the player.
FIG. 9 is a schematic configuration diagram of a record player according to another embodiment of the present invention, and FIG. 10 is a sectional side view of the configuration of a vibration isolating device of the same player. 3...Player base, 4...Bottom case, 5...Vibration isolator, 6...Metal bellows, 7...Rubber Plate body.

Claims (1)

[Scope of utility model registration request] A metal bellows having an elastic body such as rubber attached to at least one of the upper and lower surfaces is attached to the lower surface of the player body, and the player body is placed through the metal bellows and the elastic body 4. record player