JPS6013101Y2 - Record player insulator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an insulator for a record player that blocks external vibrations and prevents howling.

Conventionally, this type of insulator has a cutoff frequency set around 5 to 10 Hz, and the foot (
Some insulators have a structure in which an insulator shaft (an insulator shaft) is fixed to a panel to support the panel, and an underboard on which a motor and tone arm are mounted is floated from the floor from the panel by damper rubber and a coil spring.

Shi, Kaji 1. With this structure, vibrations transmitted from the floor to the foot are directly transmitted to the panel, so when vibrations that match the natural vibration of the panel are transmitted to the foot, the panel resonates.

Another drawback is that when the panel resonates due to the propagation of sound waves in the room, vibrations that cannot be absorbed by the float structure made of damper rubber and coil springs are transmitted to the underboard that supports the motor, tone arm, etc.

Furthermore, when the cavity resonance frequency matches or is an integral multiple of the panel's natural frequency, the cavity resonance may excite the suspended underboard, worsening howling performance. .

Therefore, the present invention aims to alleviate the above-mentioned drawbacks, especially the vibration of the underboard that occurs due to the direct transmission of vibration from the foot and panel to the float structure. Accordingly, the present invention provides an insulator for a record player that blocks vibrations transmitted to the float structure by the foot itself and also blocks vibrations transmitted from the panel to the float structure. To elaborate on the illustrated embodiment, the first
The figure is a cross-sectional view showing one embodiment of the insulator according to the present invention. In the figure, 1 is a foot (insulator shaft);
The hood 1 is made of damper rubber with a large internal loss, and its cutoff frequency is set to 30 to 100 H2, which is lower than the natural frequency of the panel 2.

The foot 1 is fixed to the panel 2 with screws 3 to support the panel 2, and 4 is a protruding collar part integral with the foot 1, which is a support part for a coil spring 6 to be described later.

Reference numeral 5 denotes a second insulator, and this insulator 5 is composed of a coil spring 6 with a cutoff frequency of about 5 to 10H2 and a bell-shaped damper rubber 7.

The second insulator 5 is suspended by locking its upper end to the collar 4 of the foot 1, and locks an underboard 8 to its lower end to float the board 8 from the floor 9.

Note that a turntable motor, tone arm, etc. are mounted on the underboard 8, and a large number of holes 8a are formed in the underboard 8 for reasons to be described later.

FIG. 2 shows another embodiment of the present invention, in which the entire foot 1 is not made of damper rubber, but different types of damper rubber la and lb are interposed near the panel 2 of the foot 1.
The same reference numbers as in FIG. 1 indicate the same parts.

Therefore, the vibration transmitted from the floor 9 to the foot 1 is transmitted to the panel 2.
The vibrations are damped at the foot 1, which is set to a cutoff frequency lower than the natural frequency of the vibration, and the vibrations transmitted to the panel 2 are significantly reduced.

Now, if the vibration that matches the unique frequency of the panel is the foot 1
Even if the excitation level of the panel 2 is attenuated by the cutoff characteristic of the foot 1, the excitation level is attenuated by the value multiplied by the cutoff characteristic.

In other words, the level of occurrence of cavity resonance is reduced.

Further, since the underboard 8 has a large number of holes 8a, the amplitude Q of the cavity resonance is suppressed, but forming the holes 8a in the panel 2 is also effective.

As a result, howling performance caused by cavity resonance transmitted through the floor 9 is improved, and even if the panel 2 is directly exposed to sound pressure and vibrates, causing cavity resonance, the underboard Since the sound pressure is damped by the hole 8a formed in the hole 8a, the sound pressure disturbance characteristics are also greatly improved.

If you simply want to improve the performance, you can simply make holes in the panel 2 and reduce the surface area that receives sound pressure.

As mentioned above, in the present invention, the panel 2 is supported by the foot 1, and the coil spring 6 is connected to the foot 1 or the panel 2.
A second insulator 5 consisting of a damper rubber 7 and a damper rubber 7 is suspended, and an underboard 8 that connects the motor and tone arm is attached to the floor 9 by the second insulator 5.
In the insulator for a record player which is floated from above, the foot 1 is made of a damper rubber with a large internal loss, so the foot 1 blocks vibrations directly transmitted from the foot 1 to the panel 2, and the vibration of the panel 2 is Reduce excitation.

Moreover, as a result, cavity resonance caused by excitation of the panel 2 is also reduced, so that the howling margin can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of an insulator for a record player according to the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment.

Claims (1)

[Scope of utility model registration request] A record player in which a panel is supported by a foot, a second insulator consisting of a coil spring and a damper rubber is suspended from the foot, and an underboard on which a motor, tone arm, etc. are mounted is floated from the floor by the second insulator. A record player insulator in which the above-mentioned foot is formed by a damper comb with large internal loss.