JPS605402A - Vibration absorber - Google Patents

Abstract

PURPOSE:To absorb the vibration energy by a tension wire by providing a magnetic member which forms a magnetic field parallel to the conductive tension wire connected to the vibration system of a pickup cartridge and therefore damping the vibration of the tension wire with said parallel magnetic field. CONSTITUTION:A stylus 2 is attached to the tip of a cantilever 3 to trace the groove of a disk record. A magnet or a pickup coil 4 is attached to an end of the lever 3 and then supported with free vibrations by a damper 5. A tension wire 1 is provided between the lever 3 and a sleeve 6, and a parallel magnetic field is produced by magnets 7a and 7b for the wire 1. Thus the wire is damped by the parallel magnetic field since the wire 1 is conductive. Then the overall natural vibration mode of a vibration system including the wire 1 is controlled electromagnetically to absorb the vibration energy of the vibration system together with the damper 5. Thus the vibration energy which is transmitted to the sleeve 6 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration absorbing device for sound absorbing equipment and precision equipment.

Conventionally, methods using mechanical loss are well known for absorbing vibrations.

When using mechanical loss, it is mainly composed of a vibrating part, a loss generating part, and a support part, and the vibration energy of the vibrating part is converted into thermal energy in the loss generating part, and the rest is transmitted to the support part. When converting into thermal energy, it is difficult to use a material that has uniform vibration damping characteristics from low to high frequencies in the mechanical loss generating part, so the vibration energy is also transmitted to the support part, and the vibration of the support part is Even if the vibration energy of the supporting part is small due to propagation through the large area of the casing, the vibrations radiated from the large area can be heard as noise. Furthermore, in the case of mechanically absorbing vibrations, it is difficult to maintain loss by applying tension beyond a certain level using a viscoelastic material, as this causes deformation of the viscoelastic material. Furthermore, when a viscoelastic material is used, it has the disadvantage that its loss characteristics change when it is compressed and expanded by vibration energy.

The present invention was made in order to solve the drawbacks of the mechanical loss addition method described above, and the tension wire of the vibration system support device of the pickup cartridge is made conductive, and the tension wire is made magnetic to form a magnetic field parallel to the conductor. When the member is set up, the vibration of the vibrating part caused by the stylus, cantilever, pickup coil, etc. is transmitted to the conductor, causing the conductor to vibrate.As the conductor vibrates in a parallel magnetic field, the conductor cuts the magnetic flux and generates an eddy current in the conductor. The currents and eddy currents are damped by a magnetic field in a direction that cancels the vibrations of the conductor, providing a device that absorbs vibrations.

This will be explained in detail below using the drawings.

Fig. 1 shows an example of a structure in which a tension wire 1 of a vibration system support device for a pickup cartridge is used as a conductive part to perform electromagnetic control.A stylus 2 is attached to the tip of a cantilever 3, and this part is a groove in a disc record. trace.

A magnet or pickup coil 4 is attached to one end of the cantilever 3.
is installed and the damper 5 is connected to the magnet or pickup coil 4.
cantilever 3 and the IJ-Flo
A tension wire 1 is provided between them.

The tension wire 1 is provided with a parallel magnetic field by magnets 7a and 7b, and since the tension wire 1 is conductive, it is braked by the magnetic field. A magnetic fluid or a rubber magnet is placed around the tension wire 1 in a parallel magnetic field.
may be placed. Since the natural vibration mode of the entire vibration system including the tension wire 1 is electromagnetically controlled and the vibration energy of the vibration system is absorbed together with the damper, the vibration energy transmitted to the professional can be reduced. In addition, reflection of vibrations at the ends can be reduced, and by providing a rod-shaped tension/wire plate-shaped portion, the area parallel to the magnetic field may be increased.

As mentioned above, when a conductor is provided in a parallel magnetic field, it absorbs vibrations and reduces the vibrations transmitted to the sleeve, and even when connected to the vibrating part, the vibration absorbing device can be used without significantly increasing the weight of the vibrating part. Can be configured.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention, l is a tension wire, 2 is a stylus, 3 is a cantilever,
4 is a pickup coil, 5 is a damper, 6 is a sleeve, and 7 is a magnet.

Claims (1)

[Claims] A magnetic member forming a parallel magnetic field to a tension wire connected to the vibration system of the pickup cartridge is provided so that the vibration of the vibration system is transmitted to the tension wire and the vibration of the tension wire is damped by the parallel magnetic field. A vibration absorbing device characterized in that vibration energy is absorbed by the tension wire.