JPH02283934A - Vibration isolating device - Google Patents

Abstract

PURPOSE:To prevent the relative position between a frame and a vibrating body from a neutral position even when the direction of action by the gravitation varies so as to enhance the vibration isolating function by resiliently supporting the vibrating body to the frame in the gravitational direction, and by providing an urging means for resiliently supporting the vibrating body in at least one of two directions orthogonal to the gravitational direction. CONSTITUTION:A vibrating body 12 is resiliently supported to a frame by means of coil springs 13a, 13b and vibration damping bodies 14 in a floating condition. The dead weight of the vibrating body 12 is supported to the spring 13a and accordingly, it does not acts substantially to the damping bodies 14 so that the springs 13b urge the vibration body 12 in a horizontal direction with a constant tension. When an external vibration 11 is applied to the frame 11, the damping bodies 14 deform so as to contribute to absorption of the vibration or damping thereof with exhibiting substantially no spring force. Further, the springs 13a, 13b resiliently deform so as to effectively bear the load, thereby vibration transmitted from the frame may be isolated from the vibrating body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibration isolating device used in a precision instrument device subject to external disturbance vibrations, such as a portable optical disc player or a vehicle-mounted optical disc player.

BACKGROUND OF THE INVENTION FIG. 3 is a schematic diagram of a vibration isolating device used in a conventional vehicle-mounted optical disc player. 1 is a frame, 2 is a vibrating body in which an optical pickup, a turntable, etc. are provided, 3 is a coil spring that elastically supports the vibrating body 2 as an elastic support force means, and 4 is a container made of an elastic material. This is a vibration damping body with a viscous fluid sealed inside and outside.

The operation of the vibration isolating device configured as described above will be explained below. The vibrating body 2 is supported by the frame 1 in a 70-ring state via a coil spring 3 and a vibration damping body 4. The weight of the vibrating body 2 is supported by the coil spring 3 and does not act on the vibration damping body 4. When external vibrations are input to the frame 1, the vibration damping body 4 exerts almost no spring force, but absorbs vibration energy through its deformation, in other words, contributes to vibration damping, and the coil spring 3 Since the elastic deformation effectively supports the load, vibrations transmitted from the frame 1 are insulated from the vibrating body 2. Also, depending on the vibration frequency, the phase of the vibration frequencies of the frame 1 and the vibrating body 2 will shift, and the relative displacement between them will change, and the displacement will be maximum near the resonance frequency, so that both will reach the seismic limit of the device. They are placed at a certain distance from the neutral position to prevent collisions.

Problem to be Solved by the Invention However, with the above configuration, when the device or car to which the vibration isolating device is fixed is tilted from a horizontal plane, the direction in which gravity acts will change as shown in Figure 4. As a result, the relative positional relationship between the frame 1 and the vibrating body 2 deviates from the neutral position, and the frame 1 and the vibrating body 2 come into contact with each other.
If external vibration is applied in this state, frame 1
A problem occurred in that the vibrating body 2 collided with the vibrating body 2, and the vibration insulation effect was not exhibited at all, resulting in a significant deterioration of the seismic performance.

The present invention has been developed in view of the above problems, and even if the device or car to which the vibration isolating device is fixed is tilted from a horizontal plane and the direction in which gravity acts changes, the relative positional relationship between the frame 1 and the vibrating body 2 will be kept from the neutral position. The purpose of the present invention is to provide a vibration isolating device that prevents displacement, exhibits a sufficient vibration insulating effect, and ensures good seismic performance.

Means for Solving the Problems In order to solve the above problems, the vibration isolating device of the present invention includes a frame, a vibrating body housed inside the frame, and a vibration damping body interposed between the vibrating body and the frame. , while elastically supporting the vibrating body in the direction of gravity with respect to the frame,
It consists of an elastic support biasing means that elastically supports at least one of the two directions perpendicular to the direction of gravity.

Effect: With the above configuration, even if the device or car to which the vibration isolating device is fixed is tilted from the horizontal plane and the direction in which gravity acts changes, it will elastically support at least one of the two directions orthogonal to the direction of gravity. The elastic support biasing means alleviates the effect of gravity, prevents the relative positional relationship between the frame and the vibrating body from shifting from the neutral position, provides sufficient vibration insulation effect, and ensures good seismic performance. It is.

EXAMPLE Hereinafter, a vibration isolating device according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a vibration isolating device in one embodiment of the present invention.

11 is a frame, 12 is a vibrating body in which an optical pickup, a turntable, etc. are provided, 13IL is a coil spring that elastically supports the vibrating body 12 in the direction of gravity as an elastic support force means, and 13b is an elastic support. A coil spring 14 that elastically supports the vibrating body 12 in a direction perpendicular to the direction of gravity as a biasing means is a vibration damping body having a container portion made of an elastic material and a viscous fluid sealed inside.

The operation of the vibration isolating device configured as described above will be explained below. The vibrating body 12 is a coil spring 13a
, 13b and the vibration damping body 14 to the frame 11 70
- supported in a tilting state. The dead weight of the vibrating body 2 is supported by the coil spring 13&, and the vibration damping body 14
It's not working. The coil spring 13b urges the vibrating body 12 in the horizontal direction with a constant tension. When external vibration is input to the frame 11, the vibration damping body 1
4 contributes to the absorption of vibration energy, in other words, vibration damping, through its deformation without exerting almost any spring force, and the coil springs 131L and 13b effectively support the load through their elastic deformation, so that the frame 1
The vibrations transmitted from the vibrating body 12 are insulated from the vibrating body 12.

In addition, due to the vibration frequency, the phase of the vibration frequencies of the frame 11 and the vibrating body 12 is shifted, and the relative displacement amount between the two changes.
In particular, the amount of displacement is maximum near the resonance frequency, so they are placed at a constant distance from the neutral position to prevent them from colliding to the seismic limit of the device.

Next, FIG. 2 shows a state in which a device, a car, etc. to which the vibration isolating device is fixed is tilted from a horizontal plane. Although the direction in which gravity acts changes, the tension of the coil spring 13b prevents the relative positional relationship between the frame 11 and the vibrating body 12 from deviating much from the neutral position, and the frame 11 and the vibrating body 12 are kept at a constant distance from the neutral position. It is arranged to maintain the

If external vibration is applied in this state, frame 1
1 and the vibrating body 12 are placed at a constant distance from the neutral position, and even if the relative displacement between the two changes and reaches its maximum especially near the resonance frequency, it will not reach the seismic limit of the device. It is possible to prevent the two from colliding, to exert sufficient vibration insulation effect, and to ensure good seismic performance. The spring constant of the coil spring 13b is the same as that of frame 1 at the maximum inclination.
It is only necessary to set an appropriate value so that even if the relative displacement between the vibrating body 1 and the vibrating body 12 reaches a maximum, a certain distance is maintained so that the two do not collide.

In the above embodiment, the vibrating body is elastically supported with respect to the frame in only one direction perpendicular to the direction of gravity, but if the device is likely to tilt in all directions, the vibrating body is supported in the remaining direction as well. By supporting it, it becomes possible to correct all inclinations. Furthermore, by attaching the coil spring at an angle, it is possible to simultaneously support two or three different directions with one coil spring.

In the above example, a tension spring was used, but the same effect can be obtained with a compression spring, and the same effect can also be obtained with an elastic material other than a coil spring that has a small spring constant. be.

Effects of the Invention As described above, according to the present invention, the vibrating body is elastically supported with respect to the frame in the direction of gravity, and elastic support is provided that elastically supports the vibrating body in at least one of two directions perpendicular to the direction of gravity. With the extremely simple and low-cost structure of providing an energizing means, even if the device or vehicle to which the vibration isolating device is fixed is tilted from a horizontal plane and the direction in which gravity acts changes, the vibration isolation device remains perpendicular to the direction of gravity. The elastic support biasing means that elastically supports at least one of the two directions alleviates the effect of gravity, prevents the relative positional relationship between the frame and the vibrating body from shifting from the neutral position, and provides sufficient vibration insulation effect. This is to ensure good LIT seismic properties.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a vibration isolating device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the positional relationship between a vibrating body and a frame when the vibration isolating device according to an embodiment of the present invention is tilted, and FIG.
The figure is a schematic diagram of a conventionally used vibration isolator, and FIG. 4 is a schematic diagram showing the positional relationship between the vibrating body and the frame when the conventionally used vibration isolator is tilted. 11...Frame, 12.Mountain...Vibrating body, 13a
113b... Coil spring, 14...
・Vibration damping body. Name of agent: Patent attorney Shigetaka Awano and one other personjj
---Frame Figure 2

Claims (1)

[Claims] a frame, a vibrating body housed inside the frame,
A vibration damping body is interposed between the vibrating body and the frame, and the vibration damping body is elastically supported in the direction of gravity with respect to the frame, and the vibration damping body is elastically supported in the direction of gravity, and the vibration damping body is supported in at least one of two directions perpendicular to the direction of gravity. A vibration isolating device characterized by comprising an elastic support biasing means that elastically supports the direction.