JPH0253876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vibration isolating device for a record player, which is composed of rubber legs and a coil spring.

Conventional structure and its problems Traditionally, record players have been
As shown in the figure, a turntable 3 on which a record disc 2 is mounted on the top side of the record player main body 1;
A pickup arm device 4 is provided for tracing the sound groove of the record 2, and a vibration isolator 5 is provided on the bottom of the record player body 1.
is provided. As shown in FIG. 3, the vibration isolator 5 is composed of a coil spring 6 for preventing vertical vibration and a rubber leg 7 for preventing lateral vibration. However, in the above-mentioned vibration isolator,
Vertical vibrations can be prevented to some extent by selecting the installation location of the record player body 1, but lateral vibrations are generated by the record player body 1 itself and are transmitted to the tone arm 8 and damping weight 9 that constitute the pick-up arm device 4. As a result, the cartridge 10 at the tip of the tone arm 8 vibrates, generating a reproduction signal that is not in the sound groove of the record 2.
It had the disadvantage of deteriorating the S/N and wow/flatter characteristics.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks, and to provide a vibration isolating device for a record player that can improve S/N characteristics and wow and flutter characteristics.

Structure of the Invention In order to achieve the above object, the present invention provides a spiral protrusion in the same direction as the winding direction of the coil spring on the circumferential surface of a rubber leg combined with the coil spring, and The feature is that a spiral protrusion is provided in the opposite direction. According to this configuration, it is possible to damp the repulsive force of the rotational torque generated by the drive motor provided in the record player main body, and the reaction force received by the repulsive force can be further damped. This has the advantage that unnecessary cogging components specific to the drive motor can also be removed, thereby improving S/N and wow/flutter characteristics.

DESCRIPTION OF THE EMBODIMENT FIGS. 4 to 6 show an embodiment of the present invention, in which numeral 11 is a record player main body;
A turntable 12 and a pick-up arm device 13 for tracing the sound grooves of a record (not shown) mounted on the turntable 12 are provided on its upper surface. This pick-up arm device 13 has a damping weight 16 attached to the rear end of a tone arm 15 which is rotatably attached to a rotary stand 14 provided on the record player main body 11.
A cartridge 17 is provided at the tip of the tone arm 15. Further, a vibration isolating device 20 composed of rubber legs 18 and a coil spring 19 is provided on the bottom surface of the record player main body 11. The vibration isolating device 20 is disposed at each of the four corners of the bottom surface of the record player main body 11. The rubber leg 18 constituting the vibration isolator 20 has a spiral protrusion 21 on its outer peripheral surface in the same winding direction as the coil spring 19, and a spiral protrusion 21 in the opposite direction to the winding direction of the coil spring 19. It has a protrusion 22 having a shape. In this configuration, the turntable 12 rotates in the clockwise direction a by the rotational torque of the drive motor provided in the record player main body 11, and the reaction force acts in the counterclockwise direction b. Since there is no escape route, the signal is transmitted to the cabinet that constitutes the record player main body 11. This is the third force
explained by laws. When the force generated by the reaction of the rotational torque is transmitted to the cabinet constituting the record player main body 11, the tone arm 15 and damping weight 16 constituting the pick-up arm device 13 vibrate, causing the movement of the cartridge 17. The output is generated as a signal that is not in the sound groove of the record. In this embodiment, assuming that the winding direction of the coil spring 19 is counterclockwise, the reaction force generated by the rotational torque is absorbed by the spiral protrusion 21 provided on the rubber leg 18. . The reaction force is then absorbed by the spiral protrusion 22 provided on the same rubber leg 18. By absorbing the reaction force generated by the rotational torque by the spiral protrusions 21 and 22 provided in the two directions on the rubber leg 18 in this manner, the reaction force is absorbed by the cabinet constituting the record player main body 11. It is possible to prevent vibrations from being transmitted to the damping weight 16 of the tone arm 15 constituting the pickup arm device 13. In addition, in this embodiment, the diamond-shaped portion 23 surrounded by the counterclockwise protrusion 21 and the clockwise protrusion 22 is left as a portion that acts on vertical vibration, and the rubber leg 18
This is done so as not to impair its own effect.

Effects of the Invention As described above, according to the present invention, even if a damping weight is attached as a weight to the tone arm in order to suppress the low-frequency resonance of the cartridge, the drive motor does not vibrate due to the reaction force of the rotational torque. The unique cogging component can also be suppressed. Therefore, the S/N and wow/flatter characteristics are not impaired, and there is an advantage that a record player with good performance can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional record player, FIG. 2 is a front view thereof, FIG. 3 is an enlarged view of the vibration isolating device of the record player, FIG. 4 is a plan view of the record player of the present invention, and FIG. The figure is an enlarged view of the vibration isolator of the same record player, and FIG. 6 is a perspective view of the rubber legs constituting the same vibration isolator. 11... Record player body, 18... Rubber legs, 19... Coil spring, 21, 22...
protrusion.

Claims (1)

[Claims] 1. It is equipped with a rubber leg provided on the bottom surface of the record player body, and a coil spring fitted on the outer periphery of the rubber leg, and a spiral protrusion on the circumferential surface of the rubber leg in the same direction as the winding direction of the coil spring. A vibration isolating device for a record player, characterized in that a spiral protrusion is provided in a direction opposite to the winding direction of the coil spring.