JPH10184753A - Damper device - Google Patents

Abstract

(57) [Problem] An object of the present invention is to provide a sufficient damping effect even in a narrow installation place where displacement is limited. A damper device includes an upper damper unit.
, A lower damper part 13 and a coupling part 15. The upper damper portion 12 and the lower damper portion 13 are formed on a first elastically deforming portion 17 formed in a plate shape on the upper surface of the disc-shaped contact portion 16.
(17a to 17c) and the second elastically deformable portion 18 (18a to 18c) which is lower than the first elastically deformable portion 17 by the dimension h.
c) project radially. First elastic deformation portion 17
Is provided higher than the second elastic deformation portion 18,
When the vibration is small, the first elastic deformation portion 17 is elastically deformed. When the vibration is large, the first elastic deformation portion 17 and the second elastic deformation portion 17 are deformed.
The elastically deformable portion 18 is elastically deformed. Therefore, the input vibration can be efficiently attenuated without softening the rubber hardness and increasing the displacement amount, or reducing the displacement amount and hardening the rubber hardness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a damper device,
In particular, the present invention relates to a damper device configured to effectively reduce the influence of external vibration.

[0002]

2. Description of the Related Art As a storage medium for storing information such as a database and software, a disk-shaped storage medium reproduced by a laser pickup of an optical disk apparatus is used. In this type of optical disc device, when external vibrations are propagated, the position of the laser beam emitted from the precisely controlled pickup is shifted and off-track occurs, so that information recorded on the disc surface cannot be read. Would.

Therefore, in an optical disk device, a damper device made of an elastic material such as rubber is attached between a base supporting a pickup or a turntable and a frame supporting the base. As a conventional damper device, for example, there is one as shown in FIG.

The damper device 1 includes a first damper which is compressed between a through hole 4 through which a mounting screw 3 screwed into a frame 2 is inserted, and a base 5 supporting the frame 2 and a pickup or a turntable. A portion 6 and a second damper portion 7 compressed between the base 5 and the head 3a of the mounting screw 3 are provided. The insides of the first damper section 6 and the second damper section 7 are annular air chambers 6a, 7a. When a load is applied, the first damper section 6 and the second damper section 7 are deformed and the air chamber 6
The air of a and 7a is sucked and exhausted.

[0005] Between the first damper part 6 and the second damper part 7, a constricted part 8 for fitting into the mounting hole 5a of the base 5 is provided. When the external vibration in the X direction or the Y direction propagates to the frame 2, the first damper unit 6 and the second damper unit 7 elastically deform and the air in the air chambers 6 a, 7 a. Are absorbed and exhausted to attenuate the vibration and prevent the propagation of the vibration to the base 5.

[0006]

In the above-described damper device, it is difficult to absorb both a vibration having a relatively large amplitude and a low frequency and a vibration having a relatively small amplitude and a high frequency. For example, when there is a sufficient mounting space between the frame 2 and the base 5, the strokes of the first damper portion 6 and the second damper portion 7 can be sufficiently taken, so that the damper device 1 is made of a soft rubber material. It is possible to absorb vibrations of large amplitude and small amplitude.

However, when a sufficient space for mounting the damper device 1 cannot be obtained due to a reduction in size and thickness of the disk device, the damper device 1 is formed of a hard rubber material. Therefore, when vibration having a large amplitude is input to the frame 2, the first damper portion 6 or the second damper portion 7 can be elastically deformed to absorb the vibration, but when vibration having a small amplitude is input to the frame 2. Are the first damper part 6 and the second damper part.
The vibration propagates to the base 5 without the elastic deformation of the damper part 7.

Therefore, when the damper device 1 is mounted in a narrow place, external vibration cannot be sufficiently attenuated, and the vibration is transmitted to the base 5 supporting the pickup and the turntable, thereby causing a problem that off-track occurs. there were. Therefore, an object of the present invention is to provide a damper device that solves the above problem.

[0009]

In order to solve the above problems, the present invention has the following features. Claim 1
The present invention provides a damper device interposed between a first base and a second base to absorb external vibration transmitted to the first base or the second base. An abutting surface, a first elastically deformable portion extending from the abutting surface to abut on one of the first base or the second base, and a first or second base from the abutting surface. Extending to be close to one and the first
And a second elastically deformable portion that receives a compressive load after the elastically deformable portion is compressed by external vibration.

Therefore, according to the first aspect of the present invention, the first elastically deformable portion extending so as to contact one of the first base and the second base, and the first elastically deformable portion are compressed by external vibration. And a second elastically deforming portion that receives a compressive load.
When the elastically deforming portion elastically deforms and absorbs vibration, and the vibration having a relatively large amplitude is inputted, the first elastically deforming portion and the second
The elastic deformation portion can elastically deform and absorb vibration.

According to a second aspect of the present invention, in the disk device according to the first aspect, the contact surface is formed in a disk shape, and the first elastic deformation portion and the first elastic deformation portion are formed on the surface of the contact surface. 2
The elastic deformation portion is formed so as to protrude radially. Therefore, according to the second aspect of the present invention, since the first elastically deformable portion and the second elastically deformable portion are radially formed on the circular contact surface, vibrations from any directions can be attenuated. .

According to a third aspect of the present invention, in the damper device according to the first or second aspect, the first elastically deformable portions and the second elastically deformable portions are alternately arranged. It is. Therefore, according to the third aspect of the present invention, since the first elastically deformable portions and the second elastically deformable portions are alternately arranged, the vibration can be attenuated in a well-balanced manner regardless of the magnitude and direction of the vibration. it can.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a damper device according to the present invention, FIG. 2 is a side view of the damper device, FIG. 3 is a bottom view of the damper device, FIG. 4 is a side view of the damper device shown in FIG. FIG. 5 is a transverse sectional view taken along line AA in FIG. 4.

The damper device 11 is integrally formed of a rubber material having elasticity, is vertically symmetrical when viewed from the side, and has the same planar shape as viewed from above and the same bottom shape as viewed from below. The damper device 11 is generally
An upper damper portion 12, a lower damper portion 13, and a groove 14 formed between the upper damper portion 12 and the lower damper portion 13.
And a connecting portion 15 for connecting the upper damper portion 12 and the lower damper portion 13 in the groove 14.

Since the upper damper section 12 and the lower damper section 13 have the same shape, the configuration of the upper damper section 12 will be described. The upper damper portion 12 has a first elastically deforming portion 17 (17a) formed in a plate shape on the upper surface of the disc-shaped contact portion 16.
17c) and second elastically deformable portions 18 (18a to 18c) formed in the same shape as the first elastically deformable portion 17 project radially. In this embodiment, the first elastic deformation portions 17a to 17c and the second elastic deformation portions 18a to 18c
And are alternately arranged at equal intervals of 60 °.

Therefore, even if vibrations are input from any radial direction, the first elastic deformation portions 17a to 17c and the second
Any of the elastically deforming portions 18a to 18c can be elastically deformed to effectively attenuate the vibration. First elastic deformation portion 17 (17a to 17c) and second elastic deformation portion 18
The side surfaces of (18a to 18c) are formed in a trapezoidal shape, and the width of the upper end portion is smaller than the width of the root portion. Further, the first elastic deformation portion 17 is moved from the contact portion 16 to the first elastic deformation portion 17.
The height Ha to the upper end of (17a-17c) is the contact portion 1
6 to the upper end of the second elastically deforming portions 18 (18a to 18c), and is larger than the height Hb. In this embodiment, the first elastically deforming portions 17 (17a to 17c) and the second The difference h from the deformed portion 18 (18a to 18c) is h = Ha−H
b is set to about 0.2 to 0.6 mm.

Since the first elastic deformation portion 17 is provided higher than the second elastic deformation portion 18 as described above, the first elastic deformation portion 17 exerts a force in the Y direction when the vibration has a relatively small amplitude. The first elastically deforming portion 17 and the second elastically deforming portion 18 elastically deform by receiving a force in the Y direction when the vibration is relatively large in amplitude. Therefore, the inputted vibration can be efficiently attenuated without softening the rubber hardness to increase the displacement amount or reducing the displacement amount to increase the rubber hardness.

The number of the first elastic deformation portions 17 and the second elastic deformation portions 18 is not limited to three, but may be four or more. Also, the coupling portion 15 provided in the groove 14
Is a cylindrical portion 20 connecting the upper damper portion 12 and the lower damper portion 13, wide ribs 21 (21 a to 21 c) provided on the outer periphery of the cylindrical portion 20 so as to protrude in the radial direction, It comprises narrow ribs 22 (22a to 22c) provided on the outer periphery so as to protrude in the radial direction.

As shown in FIG. 5, the wide ribs 21 (21a
21c) and the narrow ribs 22 (22a to 22c) have different protruding lengths in the radial direction, and the wide ribs 21 and the narrow ribs 22 are radially arranged at equal intervals of 60 °. I have. The wide ribs 21 and the narrow ribs 22 are arranged alternately. When a force in the horizontal direction (X direction) acts, the wide ribs 21 (21a to 21c) and the narrow ribs 22 are arranged. (22a to 22c) can be elastically deformed to attenuate the vibration in the X direction.

The number of wide ribs 21 and narrow ribs 22 is not limited to three, but may be four or more.
As described above, since the wide ribs 21 (21a to 21c) protrude more in the radial direction than the narrow ribs 22 (22a to 22c), the wide ribs 21 (21a to 21c) are used when the vibration has a relatively small amplitude. It is elastically deformed by receiving a force in the X direction, and when the vibration has a relatively large amplitude, the wide rib 21 (2
1a to 21c) and the narrow ribs 22 (22a to 22c) are elastically deformed by receiving a force in the X direction. Therefore, regardless of the magnitude and direction of the vibration, the input vibration can be efficiently attenuated.

Therefore, even when the damper device 11 is mounted in a narrow installation place where the displacement amount cannot be sufficiently secured, external vibration can be satisfactorily attenuated regardless of the magnitude of the amplitude, and the vibration resistance of the device is improved. Can be enhanced.
At the center of the damper device 11, a through-hole 23 that penetrates the cylindrical portion 20 in the up-down direction is provided. Further, the groove width of the groove 14 formed between the upper damper portion 12 and the lower damper portion 13 is formed to an arbitrary size according to the thickness of the portion to be mounted.

FIG. 6 is an exploded perspective view for explaining a case where the damper device is mounted on the disk device. Reference numeral 25 denotes a frame of the disk device, and a base 26 is mounted on a bottom plate 25a by mounting screws 27. Shafts 28a protruding from both sides of a traverse 28 on which a pickup and a turntable (both not shown) are mounted are rotatably inserted into the support portion 26a of the base 26. To be rotatable.

The damper device 11 is mounted on mounting portions 26b provided at four places on the lower surface side of the base 26 and interposed between the frame 25 and the base 26. The mounting screw 27 is inserted. FIG.
7 is an enlarged plan view showing an attached state of the damper device 11, and FIG. 8 is a longitudinal sectional view taken along line BB in FIG.

The damper device 11 includes a mounting portion 2 for the base 26.
6b is mounted with the groove 14 fitted in the mounting hole 26c provided in the mounting hole 6c. The mounting screw 27 has a screw portion 27a screwed into a screw hole 25b of the frame 25 and tightened. The head portion 27b abuts on the first elastically deforming portion 17 of the upper damper portion 12 of the damper device 11, and Elastic deformation part 18 of 2
Are mounted at positions separated by a gap h. Therefore, in the lower damper portion 13 of the damper device 11, the lower end of the first elastically deformable portion 17 is in contact with the frame 25, and the second elastically deformable portion 18 is separated by the gap h.

Therefore, when an external vibration having a relatively small amplitude is input to the frame 25, the damper device 11 causes the first elastically deforming portions 17 of the upper damper portion 12 and the lower damper portion 13 to be moved.
The frame 2 is elastically deformed to attenuate the vibration and
5 is prevented. Further, when external vibration having a relatively large amplitude is input to the frame 25, the damper device 11 causes the first damper unit 12 and the lower damper unit 13
The elastic deformation portion 17 and the second elastic deformation portion 18 are elastically deformed to attenuate the vibration and prevent the vibration from being propagated to the frame 25. As a result, the external vibration input to the frame 25 does not propagate to the pickup or the turntable, thereby preventing off-track.

The upper damper section 12 of the damper device 11
As shown in FIG. 9, the lower damper portion 13 has the first elastic deforming portion 17 and the second elastic deforming portion 18 which project in a plate shape and radially project at equal intervals as described above. The vibrations G1 to G8 can also be attenuated.

Further, in this embodiment, since the first elastic deformation portion 17 and the second elastic deformation portion 18 are formed in a trapezoidal shape when viewed from the side, the applied load is small and the amount of deformation is small. When it is small, the narrow portions of the first elastic deformation portion 17 and the second elastic deformation portion 18 are compressed, and the first elastic deformation portion 17 and the second elastic deformation portion become larger as the load increases and the deformation amount increases. The wide portion 18 is compressed, and the damping force changes according to the magnitude of the load. Therefore, the damper device 11 can effectively attenuate the vibration regardless of the magnitude of the applied load and prevent the propagation of the vibration.

FIG. 10 is a graph for comparing the vibration absorption energy characteristics of the conventional one and the damper device 11 of the present invention. Graph I shows the characteristics of a conventional damper device having a higher rubber hardness. Graph II shows the characteristics of a conventional damper device having a soft rubber hardness. Graph III shows the characteristics of the damper device 11.

In the conventional damper device, when the rubber hardness is set to be higher (see graph I), in the NG region where the vibration having a small amplitude is inputted, the vibration cannot be absorbed and the vibration is propagated to the pickup or the turntable. I will. Also,
When the rubber hardness is softened (see graph II), when a vibration having a large amplitude is input, the vibration is compressed to a preset full stroke and becomes a bottomed state (NG), and the damper device is compressed to the limit. Cannot absorb vibration.

On the other hand, according to the damper device 11 of the present invention, when vibrations having a small amplitude are inputted even if the rubber hardness is high, the upper damper portion 12 and the lower damper portion 13 are provided.
Only the first elastic deformation portion 17 elastically deforms to absorb vibration. Further, in the damper device 11, even if the rubber hardness is softened, a vibration having a large amplitude is input, and when the deformation amount reaches the inflection point in the graph III, the first elastic deformation portion 17 and the second elastic deformation portion It is possible to prevent the vibration from being propagated to the pickup or the turntable by absorbing the vibration due to the elastic deformation of the pickup 18.

Therefore, the damper device 11 can efficiently attenuate the input vibration without softening the rubber hardness to increase the displacement amount or reducing the displacement amount to harden the rubber hardness. . In the above-described embodiment, the case where the damper device 1 is mounted on the vibration preventing portion of the disk device is described as an example. However, the present invention is not limited to this.
Of course, 1 can be applied.

In the damper device 11, the first
Distance between the elastically deformable portion 17 and the second elastically deformable portion 18,
The width, thickness, height, and number of installations are selectively set as appropriate according to each mounting location.

[0033]

As described above, according to the first aspect of the present invention, according to the first aspect of the present invention, the first elastic deformation portion extending so as to contact one of the first base and the second base. When,
Since the first elastically deformable portion is compressed by external vibration and has a second elastically deformable portion which receives a compressive load, the first elastically deformable portion is elastically deformed when relatively small amplitude vibration is input. When the vibration is absorbed and the vibration having a relatively large amplitude is input, the first elastic deformation portion and the second elastic deformation portion are elastically deformed and can absorb the vibration. Therefore, even in the case of being installed in a narrow installation place where the amount of displacement cannot be sufficiently secured, external vibration can be favorably attenuated regardless of the magnitude of the amplitude, and the earthquake resistance of the device can be improved.

According to the second aspect of the present invention, since the first elastically deformable portion and the second elastically deformable portion are radially projected on the circular contact surface, vibrations from any direction are attenuated. be able to. According to the third aspect of the present invention, since the first elastically deformable portions and the second elastically deformable portions are alternately arranged, the vibration can be attenuated in a well-balanced manner regardless of the magnitude and direction of the vibration. it can.

[Brief description of the drawings]

FIG. 1 is a plan view of a damper device according to the present invention.

FIG. 2 is a side view of the damper device.

FIG. 3 is a bottom view of the damper device.

FIG. 4 is a side view of the damper device shown in FIG. 2 as viewed from the left side.

FIG. 5 is a transverse sectional view taken along line AA in FIG.

FIG. 6 is an exploded perspective view for explaining a case where the damper device is mounted on the disk device.

FIG. 7 is an enlarged plan view showing an attached state of the damper device.

8 is a vertical sectional view taken along line BB in FIG.

FIG. 9 is a side view showing the direction of vibration acting on the damper device.

FIG. 10 is a graph for comparing vibration absorption energy characteristics of a conventional damper device and a damper device of the present invention.

FIG. 11 is a longitudinal sectional view for explaining a conventional damper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Damper apparatus 12 Upper damper part 13 Lower damper part 14 Groove 15 Coupling part 16 Contact part 17 (17a-17c) 1st elastic deformation part 18 (18a-18c) 2nd elastic deformation part 20 cylindrical part 21 (21a) ~ 21c) Wide rib 22 (22a ~ 22c) Narrow rib 25 Frame 26 Base 27 Mounting screw 28 Traverse

Claims (3)

[Claims] 1. A damper device interposed between a first base and a second base for absorbing external vibration transmitted to the first base or the second base, wherein one of the first base and the second base is provided. A first elastically deformable portion extending from the contact surface to contact one of the first base or the second base; and a first or second base from the contact surface. And a second elastically deforming portion that extends close to one of the first and second elastically deformable portions and receives a compressive load after the first elastically deformable portion is compressed by external vibration. 2. The damper device according to claim 1, wherein the contact surface is formed in a disk shape, and the first elastic deformation portion and the second elastic deformation portion are radially formed on the surface of the contact surface. A damper device formed so as to protrude from the damper device. 3. The damper device according to claim 1, wherein the first elastically deformable portions and the second elastically deformable portions are alternately arranged.