JPH11141605A - Suspension structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a spring property other than a coil spring to improve aseismatic performance, by providing the integrated structure of the coil spring and silicone gel. SOLUTION: A suspension structure for imparting a spring property and damping effectiveness together, is to have structure including a spring damper 1 integrating a coil spring 11 with viscoelastic body material such as silicone gel. In this case, the damping factor of the spring damper 1 can be made adjustable by using at least one side of the shape and used quantity of viscous material, also providing a cavity portion in the spiral inside of the coil spring 11. Plural coil springs can be constituted as a damper row, by integrating plural coil springs by the viscoelastic body material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk device,
The present invention relates to a suspension structure for vibration and shock resistance of other precision equipment.

[0002]

2. Description of the Related Art Conventionally, a suspension structure (vibration insulating structure) in an optical disk device relates to driving of an objective lens of an optical head and removal of resonance. Its purpose is different from that of vibration isolation.

For example, Japanese Patent Application Laid-Open No. 58-205935 discloses that a viscous body and a pair of circular spiral springs arranged in a direction perpendicular to the optical axis of an objective lens are formed. Technologies are introduced.
However, since this structure acts only in the same direction as the optical axis of the objective lens due to its structure, there is a problem that vibration isolation in a direction perpendicular to the optical axis of the objective lens can hardly be achieved.

As another example of using gel, there are techniques described in Japanese Patent Application Laid-Open Nos. 5-166208 and 8-335326. This is to fill the gap with the gel so that the vibration of the suspension wire is not transmitted to other members, and is different from the present invention in both structure and purpose.

[0005] As a chassis-type suspension structure generally used conventionally, there is a structure shown in FIGS. 9, 10 and 11. This is because a coil spring 11 such as a coil spring for vibrationally insulating between an internal structure 2 such as a mechanical deck and a housing exterior 3 and a viscous fluid such as silicon oil in a hollow elastomer container. A viscous fluid-filled damper 100 having a sealed elastomer portion 101 and a shaft 102 is disposed, and a viscous resistance generated when the viscous fluid is stirred by the shaft 102 is used as a damper.

[0006]

The first problem is that a viscous fluid-filled damper 10 is required to increase the damping coefficient.
Increasing the number of zeros increases the apparent spring constant. For this reason, a phenomenon occurs in which the resonance frequency of the suspension system increases, which causes deterioration of the seismic and shock resistance performance due to a decrease in vibration insulation. The reason is that the elastic component of the elastomer portion 101 of the viscous fluid-filled damper 100 is added to the spring constant of the coil spring.

The second problem is that it is difficult to finely adjust the damper coefficient even when it is desired to adjust the coefficient. The reason is that it can be adjusted only in units of the viscous fluid-filled damper.

A third problem is that if excessive vibration or impact is applied, silicon oil may leak into the device. The reason is that the shaft 102 that transmits the phase difference between the internal structure 2 and the housing exterior 3 due to vibration to the damper may break through the elastomer film enclosing silicone oil.

An object of the present invention is to improve the seismic performance by eliminating a spring property other than a coil spring by forming a structure in which a coil spring and silicon gel are integrated.

[0010]

According to the present invention, there is provided a suspension structure having both a spring property and a damping effect, wherein a coil spring and a viscoelastic material are integrated. The structure includes a damper. In this case, the damping coefficient of the spring damper can be adjusted according to at least one of the shape and the usage amount of the viscous substance. Further, by providing a hollow portion inside the spiral of the coil spring, the damping coefficient can be adjusted. Also, a plurality of coil springs may be integrated with a viscoelastic material to form a spring damper row. Further, a structure in which the coil spring and the viscoelastic substance are integrated by integral molding may be employed. Further, as the viscoelastic substance, silicon gel is preferable. Further, the coil spring may have a double spring structure. On the other hand, in the present invention, a spring damper is disposed between an internal structure such as a mechanical deck and a housing exterior, and a suspension structure for attenuating vibration of the internal structure, wherein the spring damper includes a coil spring and a silicon gel. May be integrally formed. In that case, a plurality of coil springs may be included, and each coil spring may be integrated with silicone gel to form a spring damper row. Further, the coil spring may have a double spring structure.

According to the present invention, it is possible to eliminate a spring property other than the coil spring by using a silicone gel integrally formed with the coil spring as a damping material against the vibration in the compression direction of the coil spring. Become. In addition, since the constituent materials are only the coil spring and the silicon gel, it is possible to insulate the coil spring against vibration in the shear direction. Furthermore,
By adjusting the amount of silicon gel, fine adjustment of the damping amount becomes possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged schematic view showing a structure of a spring damper according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a suspension structure incorporating the spring damper.

In the suspension structure according to the present embodiment, the coil spring 11 and a viscoelastic body 12 made of silicon gel or the like are integrally formed, thereby eliminating the spring properties other than the coil spring 11 and improving the vibration resistance of the device. It is to let.

In FIG. 1 and FIG. 2, the mechanical deck 2 is
The housing 3 is vibration-insulated by a plurality of spring dampers 1. The spring damper 1 itself has a structure in which a coil spring 11 and a silicon gel 12 are integrated as shown in FIG. Thereby, the vibration (or shock) applied to the housing 3 is configured to attenuate the vibration transmitted to the mechanical deck 2 by the damping effect of each spring damper 1.

In the present embodiment, the vibration (or impact) applied to the housing 3 causes the vibration transmitted to the mechanical deck 2 by the damping effect of the spring damper 1 to be about 1.4 times the resonance frequency of the spring damper 1. It is configured to attenuate at a frequency equal to or more than (square root of 2).

At this time, the setting of the resonance frequency and the resonance magnification under the operating conditions of the device is an important point that affects the performance of the device. In particular, if the damping coefficient is too large, attenuation in a high frequency range cannot be expected.On the other hand, if the damping coefficient is too small, the resonance magnification at the resonance point increases, so it is important to be able to finely adjust the damper coefficient. is there.

Therefore, in the present invention, when it is desired to increase the damper coefficient from the state shown in FIG. 2, as shown in FIG. , The spring damper row 4 is constituted, whereby the damper coefficient can be increased without changing the mounting shape, the supporting shape, and the apparent spring constant.

Conversely, when it is desired to reduce the damper coefficient, the hollow spring damper 5 can be formed by making the inside of the coil spring 11 hollow as shown in FIG. FIGS. 5 and 6 show enlarged views of the gel damper at this time.

By the way, conventionally, there is a method of using a double spring as a method of eliminating (or making it less noticeable) a resonance point of a spring system. In this case, it is necessary to reverse the winding directions of the respective coil springs so that the inner coil springs and the outer coil springs do not sandwich each other.

In this regard, as shown in FIGS. 7 and 8, a silicon gel 12 is filled between the coil spring 111 inside the double spring and the coil spring 11 outside the double spring, and the double spring spring damper 6 is integrated. Can be configured. In such a case, the silicon gel 12 serves as a protector, and has a new effect that the coil springs can be prevented from being stuck without worrying about the winding directions of the two coil springs. In addition, when integrally formed, the two coil springs can be simultaneously integrated with the silicon gel 12, thereby improving the productivity.

[0021]

The first effect is that the spring constant does not change much even if the damper capacity is increased or decreased. For this reason, it is possible to lower the resonance frequency of the suspension system. The reason is that no elastomer is used in the suspension system.

The second effect is that fine adjustment of the damper capacity is possible. Therefore, the vibration isolation effect can be optimized more than before. The reason is that the restriction by the damper container has been removed.

A third effect is that there is no contamination inside the device due to damage to the damper. Therefore, the reliability of the device can be improved. The reason is that the damper material is not silicon oil sealed in the elastomer.

A fourth effect is that the number of parts can be reduced. Therefore, the number of assembling steps of the apparatus can be reduced. The reason is that the spring and the damper are integrated.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view of a spring damper according to an embodiment of the present invention.

FIG. 2 is a schematic view when an embodiment of the present invention is incorporated in an apparatus.

FIG. 3 is a schematic view of a case where a damper coefficient according to another embodiment of the present invention is increased.

FIG. 4 is a schematic view showing a case where a damper coefficient according to another embodiment of the present invention is reduced.

FIG. 5 is an enlarged schematic view when a damper coefficient according to another embodiment of the present invention is reduced.

FIG. 6 is an enlarged schematic view when applied to a double spring according to another embodiment of the present invention.

FIG. 7 is an external view showing an example of a conventional suspension structure.

FIG. 8 is an external view showing a conventional suspension structure example.

FIG. 9 is an external view showing a conventional suspension structure example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spring damper 2 Mechanical deck 3 Case 4 Spring damper example 5 Hollow spring damper 6 Double spring spring damper 11 Coil spring 12 Silicon gel (viscous substance) 100 Viscous fluid sealing damper 101 Elastomer section 102 Shaft

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[Procedure amendment]

[Submission date] February 13, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Added

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view of a spring damper according to an embodiment of the present invention.

FIG. 2 is a schematic view when an embodiment of the present invention is incorporated in an apparatus.

FIG. 3 is a schematic view of a case where a damper coefficient according to another embodiment of the present invention is increased.

FIG. 4 is a schematic view showing a case where a damper coefficient according to another embodiment of the present invention is reduced.

FIG. 5 is an enlarged schematic view when a damper coefficient according to another embodiment of the present invention is reduced.

FIG. 6 is an enlarged plan view when a damper coefficient according to another embodiment of the present invention is reduced.

FIG. 7 is an enlarged schematic view when applied to a double spring according to another embodiment of the present invention.

FIG. 8 is an enlarged plan view when applied to a double spring according to another embodiment of the present invention.

FIG. 9 is a schematic view showing a viscous fluid-filled damper in a conventional suspension structure example.

FIG. 10 is a schematic view showing an example of a conventional suspension structure.

FIG. 11 is a schematic view showing an example of a conventional suspension structure.

[Description of Signs] 1 Spring Damper 2 Mechanical Deck 3 Case 4 Spring Damper Example 5 Hollow Spring Damper 6 Double Spring Spring Damper 11 Coil Spring 12 Silicon Gel (Viscous Material) 100 Viscous Fluid Filled Damper 101 Elastomer 102 Shaft

Claims (10)

[Claims] 1. A suspension structure for providing both a spring property and a damping effect, the suspension structure comprising a spring damper in which a coil spring and a viscoelastic substance are integrated. 2. The suspension structure according to claim 1, wherein a damping coefficient of a spring damper can be adjusted by at least one of a shape and a usage amount of the viscous substance. 3. The suspension structure according to claim 1, wherein a damping coefficient is adjustable by providing a hollow portion inside the spiral of the coil spring. 4. A plurality of coil springs are integrated with a viscoelastic substance to form a spring damper row.
The suspension structure according to claim 1. 5. The suspension structure according to claim 1, wherein the coil spring and the viscoelastic substance are integrally formed by integral molding. 6. The suspension structure according to claim 1, wherein the viscoelastic substance is silicon gel. 7. The suspension structure according to claim 1, wherein the coil spring has a double spring structure. 8. A suspension structure for disposing a spring damper between an internal structure such as a mechanical deck and a housing exterior to attenuate vibrations of the internal structure, wherein the spring damper includes a coil spring, a silicone gel, A suspension structure characterized by being integrally molded. 9. The suspension structure according to claim 7, comprising a plurality of coil springs, wherein each of the coil springs is integrated with silicone gel to form a spring damper row. 10. The suspension structure according to claim 8, wherein the coil spring has a double spring structure.