JP2001304319A - Air damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper, capable of coping with weight reduction, thinning, shortening and miniaturization of an optical disc device. SOLUTION: This air damper formed of a hollow molding damps vibration, obtaining air resistance by allowing air in the molding to go in and out of an air hole, when the molding is deformed. In this case, the molding comprises a cylindrical part formed of an integrated rigid material, and a flexible part formed of a rubber elastic body having a fitting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air damper used for a vibration damping device for attenuating external vibrations in audio equipment or information equipment using an optical disk or the like.

[0002]

2. Description of the Related Art When an optical disk device such as a compact disk and a mini disk is mounted on a vehicle or the like, if the vibration of the vehicle caused during traveling is transmitted to the optical disk device as it is, sound skipping is likely to occur. . Therefore, vibration isolation is performed by supporting the damper through a viscous fluid-filled damper.

In general, an optical disk device includes an optical pickup lens that moves forward and backward and a disk table that is driven by a spindle motor. An optical disk is mounted on this disk cable and rotated, and the optical pickup lens is optically driven. It is known as a disk device that travels in the radial direction of the disk, irradiates a beam from the optical pickup lens vertically to the optical disk from below, performs recording tracking operation, and reads and reproduces a predetermined information signal recorded on the recording track. ing.

A conventional viscous fluid-filled damper has a flexible portion 3 made of a rubber-like elastic body, as shown in FIG.
Viscosity generated by the movement of the stirring section 7 into which the shaft 6 attached to the supported member 11 is inserted moves in the viscous fluid 8 filled in the container formed by the cylindrical section 1 and the bottom section 9. The vibration transmitted from the outside to the supported member 11 is attenuated by the flow resistance. There are various types of vibrations from the outside, such as small and large vibrations and accelerations, and there are cases where an impact action also works. Such various vibrations can be prevented by changing the viscosity of the viscous fluid of the viscous fluid-filled damper and the hardness of the flexible portion made of a rubber-like elastic body in consideration of the weight and balance of the supported body. The vibration effect has been adjusted.

[0005]

However, in recent years, the optical disk device has been further reduced in size and weight, and furthermore, there is a demand for a further miniaturization while at the same time performing the above-mentioned anti-vibration characteristics. Conventional viscous fluid filled dampers are
The purpose is to allow the supported body 11 to move a predetermined distance in each direction within a certain space, and when the viscous fluid-filled damper 12 is miniaturized, the stirrer 7 moves when the supported body moves. Collides with the cylindrical portion 1 or the bottom portion 9 and the stirring portion 7
Is damaged by being pinched between the rigid shaft 6 and the cylindrical portion 1 or the bottom portion 9, causing leakage of the filled viscous fluid 8, and the viscous fluid 8 also being caused by friction or abrasion of the flexible portion or external damage. Leakage occurred. If the viscous fluid leaks,
There is a problem that the vibration-proof characteristics are remarkably deteriorated and a viscous fluid adheres to the optical disk device.

Further, the viscous fluid-filled damper is supported from the outside by viscous flow resistance generated by the movement of the stirring section 7 into which the shaft 6 is inserted in the viscous fluid 8 filled in the container. Since the vibration transmitted to the body 11 is attenuated, the stirrer needs to have a certain size, and the distance between the bottom and bottom of the stirrer also needs to have a certain distance. Must maintain a certain size, and there is a limit to miniaturization. Therefore, there is a need for a damper that does not cause leakage of a viscous fluid and that has a vibration damping effect in order to cope with light and thin and short optical disk devices.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and performs vibration-damping attenuation without enclosing a viscous fluid. It is intended to provide a damper capable of responding to the lightness and shortness of the above. That is, a hollow molded body,
In an air damper in which air in a molded body enters and exits through a vent hole when the molded body is deformed to obtain air resistance and is attenuated in vibration, the molded body is formed of an integrated rigid material and a tubular portion, and a mounting portion. An air damper comprising a flexible portion made of a rubber-like elastic body having the following.

[0008] Further, the air damper has a vent hole which is a hole or a cutout provided in a cylindrical portion. further,
The tubular portion is an air damper having a fixed portion. Further, the rigid material is a thermoplastic resin, and the rubber-like elastic body is an air damper made of a thermoplastic elastomer. Also, in an air damper which is a hollow molded body and which obtains air resistance and vibrates and attenuates when air in the molded body enters and exits from the air holes when the molded body is deformed, the molded body has an integrated rigidity. The air damper includes a cylindrical portion made of a material, a bottom portion made of a rigid material, and a flexible portion made of a rubber-like elastic body having a mounting portion.

Further, the air damper has a ventilation hole which is a hole or a cutout provided in a cylindrical portion and / or a bottom portion. Further, the cylindrical portion or the bottom is an air damper having a fixed portion. Further, the rigid material is a thermoplastic resin, and the rubber-like elastic body is an air damper made of a thermoplastic elastomer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a damper according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the air damper of the present invention is a hollow molded body, and the molded body may be a rubber-like elastic body having a cylindrical portion 1 made of a rigid material and a mounting portion 2. This is a configuration that includes a flexible portion 3 and is integrated with both. Furthermore, the hole 4 or the notch 5 is an air damper provided in the cylindrical portion.

[0011] When the molded body is deformed, air in the molded body enters and exits through the hole or the notch, thereby obtaining air resistance and damping the vibration. The notch has a hole formed by contact between the lower end of the cylindrical portion and the bottom or the device. In the form used for the disk device, for example, as shown in FIG. 2, the shaft 6 protruding from the supported body 11 is inserted into the mounting portion 2,
The cylindrical portion 1 is fixed to a support such as the housing 14, and when the external vibration is generated, the flexible portion 3 is deformed, and the air in the molded body is discharged into the hole 4.
Alternatively, it is possible to obtain an air resistance by entering and exiting the notch 5 to attenuate the vibration and to provide a vibration-proof effect.

The cross-sectional shape of the flexible portion of the present invention may be a single curve, a bellows, a step, a straight line, or a combination thereof in consideration of the moving distance of the supported member and the size of the damper. But it doesn't matter. Further, as a method for fixing the air damper of the present invention to the supported member, a method of inserting the shaft 6 protruding from the supported member 11 into the mounting portion 2 as shown in FIG. 2 or a method as shown in FIG. In addition to the method of engaging the mounting portion 12 protruding above the air damper with the support, the shaft extending from the supported body is inserted into the mounting portion and fixed as a shape in which the shaft and the inside of the mounting portion are engaged together. And the like.

Hereinafter, each member of the present invention will be described. As the rigid material of the present invention, a known metal, a hard thermoplastic resin, a hard thermosetting resin, or the like can be used in consideration of the workability of assembling with the housing or the support. For example, metals include iron, aluminum, copper, or alloys containing them, and hard thermoplastic resins include polyester, polypropylene, polystyrene, polyvinyl chloride, ABS, AS, polycarbonate, methacrylic resin, polyacetal, PET, PBT, polyamide, fluororesin, PEEK and the like can be mentioned, and hard thermosetting resins include phenol resin, melamine resin, acrylic resin, epoxy resin, unsaturated polyester resin and the like.

As the rubber-like elastic body of the present invention, known synthetic rubbers, thermoplastic elastomers and the like can be used. For example, synthetic rubber includes styrene butadiene rubber, butadiene rubber, chloroprene rubber, nitrile butadiene rubber, butyl rubber, halogenated butyl rubber, ethylene propylene rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, and the like, and thermoplastic elastomers. Examples include styrene, olefin, urethane, ester, and vinyl chloride. A known reinforcing material, a softening agent and the like may be blended in the rubber-like elastic body, and a blended material containing these rubber-like elastic bodies can also be used. In the present invention, when a hard thermoplastic resin is used for the cylindrical portion and a thermoplastic elastomer is used for the flexible portion, two-color molding by heat fusion becomes possible.

Hereinafter, the vibration damping effect and the vibration durability of the viscous fluid-filled dampers obtained in Examples and Comparative Examples were evaluated by the following test methods, and the results are shown in Table 2.

[Table 2]

As shown in FIG. 10, the test arrangement includes four rigid shafts 6 projecting from the lower surface of the supported member 11.
Are inserted into and supported by four air dampers or viscous fluid-filled dampers 10, or the shafts 6 protruding from the air dampers 10 on the lower surface of the supported member 11 are inserted into and supported by the mounting portion 2. ing. In addition, 4
The supported body 11 is suspended from the housing 14 and supported by the tension coil springs 13.
Fixed on top.

The vibration-proof effect is evaluated by moving the vibration table vertically or horizontally at a constant acceleration at a frequency of 8-20.
Vibration is performed in the range of 0 Hz, and the vibration transmission rate to the supported body is measured. At this time, the resonance frequency and the resonance magnification of the vibration transmitted to the supported body are determined by the vibration input acceleration a from the vibration table. ₁ to measure the vibration output acceleration _{a 2} from the supported body, it was determined in terms relational expression of _{20log (a 1 / a 2)} . The vibration durability was evaluated by continuously vibrating the vibrating table vertically or horizontally under the vibration test conditions shown in Table 1, and then abrading the flexible parts of the air damper and viscous fluid-filled damper. It was checked whether there was any damage due to.

[0018]

[Table 1]

[0019]

Embodiment 1 The air damper of Embodiment 1 has a bellows-like shape in which the cross section of the flexible portion 3 is axisymmetric with respect to the mounting portion 2 as shown in FIG. It is fixed to the upper end. An attachment portion 16 is formed in the tubular portion 1. Further, three notches 5 are formed at the lower end of the cylindrical portion 1. An air damper comprising a flexible portion 3 and a mounting portion 2 made of a styrene-based thermoplastic elastomer having a hardness of 20 (JIS K6253 type A), and a cylindrical portion 1 made of a polypropylene resin. The vibration damping effect was obtained without using a viscous fluid, and the air damper could be made smaller and thinner by forming the fixing portion on the side surface of the cylindrical portion.

[0020]

Embodiment 2 In the air damper of Embodiment 2, as shown in FIG. 4, the cross section of the flexible portion 3 is stepped. A fixing part 16 is formed on the bottom part 9. Further, four holes 4 are formed in the bottom portion 9. Hardness 20 (JIS K6253
An air damper comprising a flexible portion 3 and a mounting portion 2 made of a type A) styrene-based thermoplastic elastomer, and a tubular portion 1 and a bottom portion 9 made of a polypropylene resin. Vibration isolation effect is obtained without using viscous fluid,
The shape of the air damper was reduced in size and thickness by reducing the size of the cylindrical portion and the mounting portion.

[0021]

Embodiment 3 In the air damper of Embodiment 3, as shown in FIG. 5, a fixing portion 16 is formed on a tubular portion 1. Further, four holes 4 are formed in the cylindrical portion 1. Hardness 2
0 (JIS K6253 type A) styrene thermoplastic elastomer flexible part 3 and mounting part 2
And an air damper composed of a cylindrical portion 1 made of polypropylene resin. Further, the flexible portion 4 is attached to the mounting portion 2.
, So that the contact between the flexible portion and the supported member is avoided. An anti-vibration effect was obtained without using a viscous fluid, and the air damper could be made smaller and thinner by reducing the size of the cylindrical portion and the mounting portion.

[0022]

Fourth Embodiment In an air damper according to a fourth embodiment, as shown in FIG. It is fixed to the upper end of the cylindrical portion 1. A fixed portion 16 is formed in the tubular portion 1. Further, three concave portions 5 are formed at the lower end of the cylindrical portion 1. Hardness 20
A flexible portion 3 and a mounting portion 2 made of a styrene-based thermoplastic elastomer (JIS K6253 type A);
This is an air damper composed of a cylindrical portion 1 made of a polypropylene resin. Further, since the flexible portion 3 is formed from the side surface of the mounting portion 2, the configuration is such that contact between the flexible portion and the supported member is avoided. An anti-vibration effect was obtained without using a viscous fluid, and the air damper could be made smaller and thinner by reducing the size of the cylindrical portion and the mounting portion.

[0023]

Fifth Embodiment In an air damper of a fifth embodiment, as shown in FIG. 7, the cross section of the flexible portion 3 has a stepped shape and is fixed to the upper end of the cylindrical portion 1. A fixing portion 16 is formed in the tubular portion 1. Further, one hole 4 is formed in the cylindrical portion 1. An air damper comprising a flexible portion 3 and a mounting portion 12 made of a styrene-based thermoplastic elastomer having a hardness of 20 (JISK6253 type A), and a cylindrical portion 1 made of a polypropylene resin. Since the anti-vibration effect is obtained without using a viscous fluid, and the mounting portion 12 is formed to protrude above the flexible portion 3, the moving distance in the vertical direction can be further increased.

[0024]

Sixth Embodiment In an air damper of a sixth embodiment, as shown in FIG. 8, the cross section of the flexible portion 3 is stepped, and is fixed between the mounting portion 12 and the upper end of the cylindrical portion 1. I have. Tubular part 1
Are formed with three fixing portions 16. Further, three concave portions 5 are formed at the lower end of the cylindrical portion 1. Hardness 2
0 (JIS K6253 type A) is an air damper including a flexible portion 3 made of a styrene-based thermoplastic elastomer, a tubular portion 1 made of a polypropylene resin, and a mounting portion 12. Mounting part 12 and fixing part 1
6 is made of a rigid material, and can be mounted to the supported member and the housing in a form-fitting manner. The vibration damping effect was obtained without using a viscous fluid, and the air damper could be made smaller and thinner.

[0025]

Comparative Example 1 The viscous fluid-filled damper of Comparative Example 1 has a bellows-like shape in which the cross-sectional shape of the flexible portion 3 is axisymmetric with respect to the stirring portion 7 as shown in FIG. It is fixed to the upper end of the part 1. A viscous fluid 8 was filled in a container composed of the flexible portion 3, the stirring portion 7, and the cylindrical portion 1, and sealed at the bottom 9. In a container composed of a flexible portion 3 and a stirring portion 7 made of a styrene-based thermoplastic elastomer having a hardness of 20 (JIS K6253 type A), and a cylindrical portion 1 and a bottom portion 9 made of a polypropylene resin, a rotational viscosity of 0. This is a viscous fluid-filled damper having a sealed structure filled with a viscous fluid 8 made of silicone-based grease of 3 m ² / s. To obtain a viscous flow resistance by stirring viscous fluid,
The stirrer and the cylindrical part need to have a certain size, and furthermore, a distance from the stirrer to the bottom is necessary, so that it has been difficult to reduce the size and thickness.

In Examples 1 to 6, as compared with Comparative Example 1, although there is a difference in the resonance frequency depending on the shape, a satisfactory vibration damping effect can be obtained as far as the resonance magnification is observed, and the evaluation of the vibration durability is performed. Was also good. In particular, in the evaluation of the vibration durability, no scraping was observed at the mounting portion 2, which was sufficiently good for the moving distance of the supported member and was good.

[0027]

The air damper of the present invention maintains the same vibration characteristics as the conventional viscous fluid-filled damper,
Since the viscous fluid is not used, the vibration damping characteristics do not deteriorate due to the leakage, and the mounting part and the cylindrical part can be made smaller and thinner, so that the damper can be made even smaller. Thus, a design corresponding to the moving distance of the supported member is made possible. Further, in the production of the damper, the conventional step of sealing the viscous fluid can be omitted, thereby enabling a large cost reduction. Also, compared to the conventional viscous fluid-filled damper, the degree of freedom in the vertical, front, rear, left and right movement distance of the supported body can be obtained, the space saving as the damper is possible, and the cost in the production process is reduced. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a layout diagram of a disk device according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of the embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a conventional viscous fluid-filled damper.

FIG. 10 is a layout diagram of a damper of the disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Mounting part 3 Flexible part 4 Hole 5 Depression 6 Shaft 7 Stir part 8 Viscous fluid 9 Bottom part 10 Air damper 11 Supported body 12 Mounting part 13 Coil spring 14 Housing 15 Vibration table 16 Fixed part

Claims (8)

[Claims] 1. An air damper, which is a hollow molded body, wherein when the molded body is deformed, air inside the molded body enters and exits through a ventilation hole to obtain air resistance and to attenuate vibrations. A tubular portion made of a rigid material;
An air damper comprising: a flexible portion formed of a rubber-like elastic body having a mounting portion. 2. The air damper according to claim 1, wherein the ventilation hole is a hole or a notch provided in the cylindrical portion. 3. The air damper according to claim 1, wherein the tubular portion has a fixing portion. 4. The air damper according to claim 1, wherein the rigid material is a thermoplastic resin, and the rubber-like elastic body is a thermoplastic elastomer. 5. An air damper, which is a hollow molded body, wherein when the molded body is deformed, air inside the molded body enters and exits through a vent hole to obtain air resistance and attenuate vibration, and the molded body is integrated. A tubular portion made of a rigid material;
An air damper comprising: a bottom portion made of a rigid material; and a flexible portion made of a rubber-like elastic body having a mounting portion. 6. The air damper according to claim 5, wherein the ventilation hole is a hole or a notch provided in the cylindrical portion and / or the bottom. 7. The air damper according to claim 5, wherein the cylindrical portion or the bottom has a fixing portion. 8. The air damper according to claim 5, wherein the rigid material is a thermoplastic resin, and the rubber-like elastic body is a thermoplastic elastomer.