JPH0531751Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to an insulator.

BACKGROUND ART In order to protect audio equipment from external vibrations, insulators having a vibration absorption effect are often used.

FIG. 9 shows a conventional insulator. As shown in the figure, the insulator includes a hollow body 1, which is filled with a viscous fluid 2 such as silicone or oil. The hollow body 1 is mounted on a support base 3. Also,
The insulator has a braking member 4 inserted into the viscous fluid 2 from the upper part of the hollow body 1. The upper end of the hollow body 1 is made of bellows rubber 5, which makes the braking member 4 movable. The braking member 4 is attached to a support plate 6 on which audio equipment (not shown) is mounted. Note that the weight of the audio equipment and the support plate 6 is the weight of the support plate 6 and the support base 3.
It is supported by a coil spring 7 provided between the two.

In the above insulator, the support base 3
The vibration transmitted to the hollow body 1 through the damping member 4 causes the viscous fluid 2 to be stirred, thereby absorbing the vibration. However, when the temperature of the viscous fluid 2 increases due to this stirring or the increase in ambient temperature, the viscosity of the viscous fluid decreases, resulting in a disadvantage that the vibration absorbing ability decreases.

Summary of the invention The present invention has been made in view of the above points, and its purpose is to provide an insulator that can always exhibit an appropriate vibration absorption effect regardless of temperature changes.

The insulator according to the present invention includes a hollow body, a viscous fluid filled in the hollow body, and a braking member partially inserted into the viscous fluid, wherein the variable volume hollow member filled with gas It is characterized in that it is coupled to the braking member in fluid.

By adopting such a configuration, the present invention has the following effects.
In other words, even if the temperature of the viscous fluid increases and its viscosity decreases, and the vibration absorption ability due to the viscous resistance of the fluid decreases, the gas in the variable volume hollow member installed in the fluid absorbs the heat of the fluid. As the fluid expands and the area where the fluid exists narrows,
The decrease in vibration absorbing ability due to the decrease in viscosity is offset.

Therefore, a stable vibration absorption effect can always be ensured without being affected by changes in ambient temperature.

In the present invention, the variable volume hollow member is not simply disposed in the viscous fluid, but is coupled to the braking member, thereby making it possible to efficiently suppress vibrations of the braking member.

Embodiments Hereinafter, an optical disc playback device equipped with an insulator as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a carriage 12 is provided which carries optical pickup means for reading information recorded on the disk 11. As shown in FIGS. As also shown in FIG. 3, the carriage 12 has a guide shaft 13 on one side thereof.
It is attached so that it can rotate freely. Further, on the other side of the carriage 12, a block 14 which forms a part of the carriage and is made of resin or the like is fixed, and this block is brought into sliding contact with a mechanical chassis 15 which is a plate-shaped support member. . The guide shaft 13 is mounted on the mechanical chassis 15 at both ends thereof.

The mechanical chassis 15 has a turntable 16 for supporting the disk 11 and rotating it.
Then, the turntable is attached to the belt 17 (as shown in the first diagram).
A motor 18 is attached to the motor 18 for rotational driving. Note that the clamper 20 shown in FIG.
The disc 11 is clamped to the turntable 16 by. Vertical chassis 21 and 22 are fixed to both sides of the mechanical chassis 15 by a plurality of screws 23, and both vertical chassis, the mechanical chassis 15, and their mounted parts are suspended by the main chassis 25 via four coil springs 24. ing. Furthermore, four insulators 27 are interposed between both longitudinal chassis 21, 22 and the main chassis 25, and transmission of external vibrations to each component mounted on the mechanical chassis 15 is prevented.

A worm 29 is provided on the mechanical chassis 15 in parallel with the guide shaft 13 and rotatably. This worm 29 is rotationally driven by a motor 34 via a gear 30 fitted to the worm, a pulley 31 integrally formed with a gear portion 31a meshing with the gear, a belt 32, and a small pulley 33. .

As also shown in FIG. 4, a leaf spring 36 is attached to the carriage 12 at its proximal end with a screw 37, and a half nut is attached to the free end of the leaf spring to be screwed into the worm 29. 38 is fixedly installed. That is, by rotating the worm 29 in the forward and reverse directions, the carriage 12 is moved on the guide shaft 13 via the leaf spring 36 and the half nut 38.

A sliding contact member 40 made of resin or the like is also provided at the free end of the leaf spring 36 so as to come into sliding contact with the guide shaft 13. As shown in FIG. 4, the sliding member 40 has a pin portion 40a, and is in sliding contact with the guide shaft 13 at a tapered surface 40b formed at the tip of the pin portion. With this configuration,
Radial play between the guide shaft 13 and the bearing 41 of the carriage 12 into which it fits is absorbed. As is particularly clear from FIG.
A slit 36a is formed between the half nut 38 and the sliding member 40. This results in
The half nut 38 and the sliding member 40 can each move independently, so that the carriage 12 can be moved with high precision.

Here, the block 14 provided on the other side of the carriage 12 and its surrounding members will be described in detail.

FIG. 5 shows a cross-section with respect to FIG. 3, and as is clear from the figure, block 1
4 is brought into sliding contact with the mechanical chassis 15 so as to sandwich the mechanical chassis in its thickness direction. As also shown in Figure 6, block 1
In order to make the block 14 slide smoothly on the mechanical chassis 15, protrusions 14a and 14b are formed on the block 14 so as to contact the front and back surfaces of the mechanical chassis 15 with curved surfaces.

As shown in FIG. 5, the block 14 is fixed to the main body of the carriage 12 via a plate 12a. However, the plate 12a is the fifth
Shown in the figure only. The plate 12a has a distal end that engages with a flexible portion of the block 14 to flex the flexible portion, thereby allowing the carriage 1
An adjustment screw 42 for adjusting the inclination angle of 2 is screwed together. Further, plate springs 43 and 44, which act as reaction force receiving means or urging means, respectively, are attached to the plate 12a by screws 43a and 44a. FIG. 7 shows a cross section taken from FIG. 5, and only the leaf spring 43 and the mechanical chassis 15 with which it comes into sliding contact are shown.

Next, each of the above-mentioned insulators 27 will be explained in detail.

As shown in FIGS. 8a and 8b, the insulator 27 has a hollow body consisting of a housing part 46 and a lid body 47, and the hollow body is filled with a viscous fluid 48 such as silicone or oil. . A portion of the housing portion 46 is sunk into the viscous fluid 48,
A protrusion 15a formed on the mechanical chassis 15 is fitted into the recessed portion 46a. This protrusion 15a acts as a braking member for stirring the viscous fluid 48. Note that the protrusion 15a may be provided separately from the mechanical chassis 15.

A variable volume hollow member 50 made of rubber or the like and filled with gas is provided in the viscous fluid 48, and is connected to the recessed portion 46a and therefore to the protrusion 15a. That is, viscous fluid 4
By utilizing the fact that the variable volume hollow member expands or contracts with the gas enclosed therein due to a change in the temperature of the brake member 8, the movement resistance of the protrusion 15a serving as a braking member in the viscous fluid 48 is increased or decreased. be.

Effects of the Invention As detailed above, in the insulator according to the present invention, a variable volume hollow member filled with gas is coupled to a braking member inserted into a viscous fluid.

Therefore, even if the viscosity of the viscous fluid changes with temperature changes, the gas in the variable volume hollow member expands or contracts in response to this change, so the braking effect remains constant regardless of temperature changes and always A stable and appropriate vibration absorption effect can be obtained.

Furthermore, in the present invention, the variable volume hollow member is not simply disposed in the viscous fluid, but is coupled to the braking member, thereby making it possible to efficiently suppress vibrations of the braking member.

[Brief explanation of the drawing]

FIG. 1 is a front view of the main parts of the optical disc playback device according to the present invention, and FIG. 2 is related to FIG. 1.
3 is a partially detailed view of the optical disc reproducing device, FIGS. 4 and 5 are a view in the direction of the arrows and sectional view, respectively, of FIG. 3, and FIGS. FIG. 8A is a detailed sectional view of the insulator, FIG. 8B is a bb-b sectional view of FIG. 8A, and FIG. 9 is a conventional example. This is a diagram for Explanation of symbols of main parts, 11...Disk, 1
2...Carriage, 13...Guide shaft, 1
4...Block, 15...Mechashashi, 16...
...Turntable, 24...Coil spring,
25... Main chassis, 27... Insulator, 29... Worm, 34... Motor, 36...
... Leaf spring, 38 ... Half nut, 40 ... Sliding member, 48 ... Viscous fluid, 50 ... Volume variable hollow member.

Claims (1)

[Scope of utility model registration request] A hollow body, a viscous fluid filled in the hollow body, and a braking member partially inserted into the viscous fluid, wherein the variable volume hollow member filled with gas is in contact with the braking member in the viscous fluid. An insulator characterized by being coupled to.