JP2981628B2 - Insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Object of the invention]

The present invention relates to electrical, mechanical or
Audio-visual works by optical methods, etc.
The present invention relates to shock-absorbing parts which are incorporated and used in precision equipment used in various fields such as office work, control of various automatic machines, measurement, etc., and which absorbs external vibration which adversely affects the operation of the precision equipment. And an insulator for converging the vibration in a short time.

[0002]

2. Description of the Related Art Conventionally, various types of precision equipment such as audio equipment, optical equipment, and measurement equipment have been used to absorb external vibrations to prevent adverse effects on their characteristics and to prevent transmission of the vibrations to the precision equipment. Insulators are widely used. For example, in the case of compact disk players that have recently become very popular as audio equipment, it is important to make various adjustments of focus and tracking in units of several microns (microns) and read optical signals recorded on the disk. If external vibrations are directly transmitted to the optical pickup, various adjustments of focus / tracking become difficult, and malfunctions such as sound skipping occur frequently.

For this reason, recently, in addition to being provided at the bottom of the housing of the compact disk player, an insulator is also provided inside the housing to suppress external vibrations that adversely affect the optical pickup and the like. Among them, an insulator provided inside the housing is required to be particularly excellent in vibration absorption characteristics with high damping, and in recent years, an insulator made of silicone gel has been widely used. However, even if a silicone gel is used, there is still much room for improvement by developing materials with even higher damping properties with high damping properties, and changing the direction of action of the vibration absorber made of this silicone gel and changing the mechanism. Is left.

For example, a handy type compact disc player is inevitably reduced in size and weight and needs to have a simplified mechanism. There is a problem that vibrations are easily transmitted due to the environment, and an insulator that satisfies both the simplification of these mechanisms and the high damping vibration absorption characteristics has not been developed yet.

[0005]

[Technical Issues Attempted to Be Developed] The present invention has been made in view of such a background, and focuses on a linking relationship between a projecting piece provided on an outer casing and a shaft inserted into the outer casing. Another object of the present invention is to propose a novel insulator that can realize high damping vibration absorption characteristics with a mechanism as simple as possible and can cope with impact vibration.

[0006]

Configuration of the Invention

An insulator according to a first aspect of the present invention is provided between two members to which vibrations are transmitted to each other, and absorbs the vibrations and attenuates the vibrations. An external casing that absorbs vibration generated in an axial direction or a direction perpendicular to the axis by compressing or shearing its own shape, and a compression spring that is compressed and contracted inside the external casing. The casing has a substantially cylindrical shape and has a constricted portion near the center of the outer periphery in the axial direction, and a projection protrudes toward the center inside the outer casing. The projection is inserted into the outer casing during assembly. And an auxiliary vibration absorbing structure in combination with the shaft portion.

[0007] In addition to the above requirements, the insulator according to the second invention of the present application is such that the projections are combined with a shaft, so that the auxiliary cushion chamber is formed in the outer casing on both sides of the projections. It is characterized by the following.

[0008] Further, in the insulator according to the third invention of the present application, in addition to the requirements described in the first and second aspects, an auxiliary cushion chamber formed by sandwiching a protruding piece inside the outer casing is always or constantly operated. , And communicate with each other in an orifice shape.

Further, in addition to the above requirements, the insulator according to the fourth invention of the present application is such that the tip of the projection piece abuts on the shaft portion, and the projection piece bends to form an auxiliary vibration absorbing structure. It is characterized by the following.

Further, in the insulator according to a fifth aspect of the present invention, in addition to the features described in the first, second, or third aspect, the projection is provided with a slight gap with respect to the shaft portion. It is characterized in that the gap is used as an orifice.

[0011] Furthermore, an insulator according to a sixth aspect of the present invention, in addition to the requirements described in claim 1 or 2,
The action portion of the shaft with the projection piece is formed by changing its cross-sectional area in the entire range or a partial range.

Further, in the insulator according to a seventh aspect of the present invention, in addition to the features described in the first, second, or sixth aspect, the action portion of the shaft portion with the projecting piece is formed by traversing an arbitrary point in the axial direction. The cross-sectional area is configured so as to minimize the area and gradually increase in one direction or in the opposite direction to each other, and at the position where the cross-sectional area is minimum, at least the protrusion has a slight gap with respect to the shaft. It is characterized in that the projection piece is provided so as to be able to abut against the shaft part in the middle of the action part where the cross-sectional area gradually increases.

According to an eighth aspect of the present invention, there is provided an insulator according to the present invention. In addition to the requirements described in the first, second, third, or fourth aspect, the projection piece is in a state in which a tip thereof is engaged with a working portion of a shaft portion. It is characterized by being supported by.

Further, the insulator according to the ninth invention of the present application is characterized in that, in addition to the above requirements, the outer casing is made of silicone gel.

Furthermore, an insulator according to a tenth aspect of the present invention is characterized in that, in addition to the above requirements, the compression springs are provided one by one in both directions with the projection piece interposed therebetween. With these, the above-mentioned object is to be achieved.

[0016]

When an external vibration is transmitted to the insulator of the present invention, an auxiliary vibration absorbing member formed by linking a projecting piece provided inside the outer casing and a shaft portion inserted into the outer casing to cope with minute vibration. Vibration absorption is performed by the structure. In addition, with respect to vibration having a large vibration amplitude, in addition to the above, compression or shear deformation of the outer casing itself is performed, and a vibration absorbing action is performed. For even larger shock vibration, the effect accompanying the compression deformation of the compression spring acts. .

When the inside of the outer casing on both sides of the projecting piece is used as an auxiliary cushion chamber, the cushioning action of air in the auxiliary cushion chamber also acts on vibration absorption.

When the auxiliary cushion chambers formed on both sides of the projecting piece are connected to each other in an orifice shape, a pressure change occurs in both the auxiliary cushion chambers, and a vibration absorption action is performed by an air cushion effect accompanying the pressure change.

In the case where the auxiliary vibration absorbing structure is constituted by abutting the tip of the protruding piece to the shaft, the protruding piece is bent and deformed with the contact portion with the shaft and the mounting portion with the outer casing as a fulcrum. Then, a vibration absorbing action is performed by the flexural deformation.

When a slight gap is provided between the projection piece and the shaft, the gap acts as an orifice,
In addition to the vibration absorption effect by the air cushion effect, the resistance to vibration in the direction perpendicular to the axis is increased.

[0021] Further, the action portion of the shaft with the protruding piece is formed so that the cross-sectional area gradually changes, and at the position where the cross-sectional area is minimum, the protruding piece has a slight gap with respect to the shank. In the middle of the action portion where the cross-sectional area gradually increases, if the projection piece is configured to abut on the shaft portion, the gap is reduced due to a change in the relative position between the action portion and the projection piece in the shaft portion. Acting as an orifice, an air cushion action is performed, and at other positions, the projection abuts against the shaft portion, so that a vibration absorbing action accompanying the bending deformation of the projection is performed.

In the case where the tip of the projecting piece is locked to the operating portion of the shaft portion, the contact of the projecting piece with the operating portion becomes more reliable, and the projecting piece can be applied to a relatively large external vibration. The vibration absorbing action due to the bending deformation of the projection piece is performed in a wider range without shifting the contact position.

Further, when silicone gel is used as the material of the outer casing, higher damping characteristics with higher damping can be obtained, and the resilience of the compression spring due to an impact load is suppressed.

Further, in the case where one compression spring is provided in each of the two directions with the protruding piece interposed therebetween, it is possible to suppress the excessive amplitude in the axial direction from both directions. Disappears.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An insulator according to the present invention will be specifically described below with reference to the drawings. In the description, the basic structure of the insulator of the present invention is classified into three types, and the structure and the operating state of the insulator of each structure are sequentially changed while mixing other embodiments having different partial structures as appropriate. explain.

[0026]

First Embodiment That is, the first embodiment is shown in FIGS. In the figure, reference numeral 1 denotes an insulator of the present invention, which is applied to, for example, a handy-sized compact disc player 2 (hereinafter abbreviated as CD player) as shown in FIG. Specifically, a body or a frame of the CD player 2 is used as a support frame 3, and the support frame 3 and a drive unit housing 5 supported by the support frame 3.
The insulator 1 of the present invention is provided between the first and second embodiments. Incidentally, the drive unit housing 5 includes an optical pickup 6 for reading information recorded on the compact disc A, a sliding mechanism 7 for moving the optical pickup 6 in the radial direction of the compact disc A, and a disc motor M.
And so on. Reference numeral 9 in the drawing denotes an upper cover that opens and closes when the compact disc A is attached or detached.

As shown in FIGS. 1 to 3, the structure of the insulator 1 according to the first embodiment of the present invention is such that its shape is compressed or sheared so as to be axial or perpendicular to the axis. An outer casing 10 for absorbing the generated vibration, and a compression coil spring 20, which is an example of a compression spring which is contracted inside the outer casing 10 and mainly contributes to an increase in the axial drag, are provided. The outer casing 10 has a substantially cylindrical shape, and is formed as if two tire-like members were overlapped in the axial direction, joined together, and formed into a vertically symmetrical shape with a central constriction as a boundary. It is an integral member of the tube. The upper and lower end surfaces of the outer casing 10 having such a shape are denoted by reference numeral 11, the peripheral body portion is denoted by reference numeral 12, and the central constricted portion is denoted by reference numeral 13. The end face 11 is provided with an insertion port 11a serving as a receiving port for a mounting screw 26 described later, and the constricted portion 13 is formed by forming a groove for coupling with the drive unit housing 5 over the entire circumference of the peripheral body portion 12. It has become.

A protruding piece 14 is provided inside the central constricted portion 13 so as to protrude toward the center, and the tip of the protruding piece 14 is brought into contact with a working portion 30 of a shaft portion 27 of a mounting screw 26 described later. . In the embodiment shown in FIGS. 1 to 3, the projecting pieces 14 are provided on the inner peripheral surface of the outer casing 5 in a peripheral shape. However, for example, as shown in FIG.
4 or a protruding piece 14 formed in a tooth shape as shown in FIG. 4 (b).

In the embodiment shown in FIGS. 1 to 3, only one projection piece 14 is provided inside the constricted portion 13.
As shown in FIG. 5A, a plurality of projecting pieces 14 may be provided in multiple stages in the axial direction of the mounting screw 26. 5 (b) and 5 (c).
As shown in (1), a depression 14a or a bent portion 14b may be provided in the middle to change the bending characteristic of the projection piece 14. Further, as shown in FIG. 5D, a structure in which the projecting piece 14 is made thick and its working length is shortened, so that the vibration absorption accompanying the shearing deformation is increased more than the vibration absorption accompanying the bending deformation. It can also be. In FIG. 5D, reference numeral 26b denotes a spacer. In this embodiment, instead of forming the groove 28 in the mounting screw 26, the spacer 26b is divided into three members, and upper and lower spacers are formed. The element is provided with a flange, and the other spacer element is interposed therebetween, thereby forming the groove 28 substantially and engaging with the projection 14. And the projection piece 14 and the shaft part 2
The combination with 7 constitutes an auxiliary vibration absorbing structure.

As a material of the outer casing 10, a silicone gel is used as an example. Specifically, a stock solution serving diorganopolysiloxane silicone gel represented by Examples of the silicone gel used in the present invention for example the following formula [1] (hereinafter referred to as component _{^{A): RR 1 2 SiO- (R}} 2 2 SiO) n _{^{SiR 1 2 R ··· [1]}} [ wherein, R is an alkenyl group, R ¹ is a monovalent hydrocarbon group having no aliphatic unsaturated bond, R ² is a monovalent aliphatic hydrocarbon Group (at least 50 mol% of R ² )
Is a methyl group, and when it has an alkenyl group, its content is 10 mol% or less), and n is a number such that the viscosity of this component at 25 ° C. becomes 100 to 100,000 cSt.] 5000 cS viscosity at 25 ° C
t or less, consisting of an organohydrogenpolysiloxane (component B) which is a stock solution of a silicone gel having hydrogen atoms directly bonded to at least two Si atoms in one molecule, and the Si atoms in the component B It is obtained by curing a mixture adjusted such that the ratio (molar ratio) of the total amount of alkenyl groups contained in the component A to the total amount of hydrogen atoms directly bonded is 0.1 to 0.2. JIS K (K-
The cured product has a penetration of 5 to 250 as measured at 2207-1980 (50 g load) and a loss factor (tan δ) of 0.1 to 2 at a shear frequency of 0.01 to 10 Hz. .

The silicone gel will be described in more detail. The component A has a linear molecular structure, and alkenyl groups R at both ends of the molecule are added to hydrogen atoms directly bonded to Si atoms in the component B. Is a compound capable of forming a cross-linked structure. The alkenyl group present at the molecular terminal is preferably a lower alkenyl group,
A vinyl group is particularly preferred in consideration of reactivity.

R ¹ present at the molecular terminal is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and specific examples of such a group include methyl, propyl and hexyl. Alkyl group, phenyl group and fluoroalkyl group.

In the above formula [1], R ² is a monovalent aliphatic hydrocarbon, and specific examples of such a group include:
Examples include alkyl groups such as methyl group, propyl group and hexyl group, and lower alkenyl groups such as vinyl group. However, at least 50 mol% of R ²
Is a methyl group, and when R ² is an alkenyl group, the amount of the alkenyl group is preferably 10 mol% or less. If the amount of the alkenyl group exceeds 10 mol%, the crosslinking density becomes too high and the viscosity tends to be high. And n is
The viscosity of the component A at 25 ° C. is usually 100 to 10
0000 cSt, preferably in the range of 200 to 20,000 cSt.

The component B is a crosslinking agent for the component A, and
The hydrogen atom directly bonded to the atom adds to the alkenyl group in the component A to cure the component A. The B component may have any of the above-mentioned effects, and may have various molecular structures such as a linear, branched chain, cyclic or network structure.

In addition, a hydrogen atom and an organic group are bonded to the Si atom in the component B, and the organic group is usually a lower alkyl group such as a methyl group. Further, 25 of the B component
The viscosity at ℃ is usually less than 5000 cSt, preferably less than 500 cSt. Examples of such a component B include organohydrogenpolysiloxanes whose molecular ends are blocked with triorganosiloxy groups, copolymers of diorganosiloxanes and organohydrogensiloxanes, and tetraorganotetrahydrogencyclotetrasiloxanes. copolymerization siloxane consisting of HR ¹ ₂ SiO 1/2 units and SiO 4/2 units, and HR ¹ ₂ SiO 1/2 units and R
Can be mentioned copolymers polysiloxane consisting of ¹ ₃ SiO 1/2 units and SiO 4/2 units. However, in the above formula, R ¹ has the same meaning as described above.

The ratio of the total molar amount of alkenyl groups in component A to the total molar amount of hydrogen atoms directly bonded to Si in component B is generally 0.1 to 2.0, preferably It is manufactured by mixing and curing the A component and the B component so as to be in the range of 0.1 to 1.0.

The curing reaction in this case is usually performed using a catalyst. As the catalyst used herein, a platinum-based catalyst is preferable. Examples of the catalyst include finely pulverized elemental platinum, chloroplatinic acid, platinum oxide, a complex salt of platinum and olefin, platinum alcoholate, and chloroplatinic acid and vinylsiloxane acid. And complex salts thereof. Such a complex salt is used in an amount of usually 0.1 ppm or more, preferably 0.5 ppm or more, based on the total weight of the component A and the component B. The upper limit of the amount of such a catalyst is not particularly limited. For example, when the catalyst is in a liquid state or can be used as a solution, an amount of 200 ppm or less is sufficient.

The above-mentioned component A, component B and the catalyst are mixed and left to stand at room temperature or cured by heating to form the silicone gel used in the present invention. The silicone gel thus obtained is JIS K
(K-2207-1980 50g load), the penetration is usually 5
250. The hardness of such a silicone gel varies depending on the crosslinked structure formed by the above-mentioned component A and component B.

The viscosity of the silicone gel before curing and the penetration after the curing are determined by using a silicone oil having methyl groups at both ends in 5 to 75% by weight based on the obtained silicone gel.
Can be adjusted by adding in advance in an amount within the range described above. As described above, the silicone gel can be adjusted as described above, or a commercially available silicone gel can be used.

Examples of commercially available products that can be used in the present invention include CF5027, TOUGH-3 and TOUGH-3.
-4, TOUGH-5, TOUGH-6, TOUGH-
7, X3 (made by Tore Dow Corning Silicone)
2-902 / cat 1300 (manufactured by Shin-Etsu Chemical Co., Ltd.), F250-121 (manufactured by Nippon Yunika Co., Ltd.) and the like.

Incidentally, in addition to the above components A, B and the catalyst,
Thixotropic agent, pigment, curing retarder, flame retardant,
Fillers and the like can be blended within the range that does not impair the properties of the silicone gel, and silicone gels mixed with fine hollow sphere fillers may be used. Philite (registered trademark) and Expancel (registered trademark) sold by the company
Etc. can be exemplified.

As a more preferable silicone gel, there is a silicone gel produced by using a diorganopolysiloxane having a reduced low molecular weight as a stock solution of the silicone gel. That is, a cyclic diorganopolysiloxane containing 2 or more silicon-bonded alkenyl groups in one molecule as the component A, having a viscosity at 25 ° C. of 50 to 100,000 centipoise, and from 4 to 20 parts by weight. Is a diorganopolysiloxane having a content of 0.5% by weight or less. By using the silicone gel having the above characteristics, even when the spacer 1 of the present invention is combined with the electronic substrate 8, it is possible to prevent the conductive failure of the electrical switching contact caused by the organopolysiloxane gas. Further, in addition to this, it is preferable to further add a thixotropic agent to these compositions.
0 m ² / g or more of silica fine powder. Examples of commercially available silicone gels include EMX-00.
8 (Toray Dow Corning Silicone), VP7
612 (manufactured by Wacker Chemicals East Asia).

Next, the compression spring will be described. As the compression spring, the compression coil spring 20 shown in the embodiment is the most common, but any other type such as a so-called bamboo shoot spring may be applied if possible. In the embodiment shown in FIGS. 1 to 3, two compression coil springs 20 are provided, one each above and below the projection piece 14, the ends of which are held by the holding portion 15, and compressed in the outer casing 10. Become composed. As the material of the compression coil spring 20, a material made of a metal such as a piano wire or spring steel or a material made of a reinforced plastic can be used.

In setting the insulator 1 of the present invention thus constructed between the support frame 3 and the drive unit housing 5 as a supported member, first, the elasticity of the outer casing 10 is used to make the drive unit housing 5 Is fitted so that the constricted portion 13 of the outer casing 10 is engaged with the mounting opening 8 at. Next, it is fixed to the support frame 3 by mounting screws 26 from above through a washer 25 and a sub-frame 4 provided in the support frame 3.

When the insulator 1 is mounted between the support frame 3 and the drive unit housing 5 in this manner, the tip of the projection piece 14 comes into contact with the operating portion 30 of the shaft 27 in the mounting screw 26. . Incidentally, with such a configuration, the inside of the outer casing 10 is divided into two parts on both sides with the projection piece 14 interposed therebetween. In many cases, the shaft portion 27 is used upright, so that these two chambers are used. As an example, the upper chamber 10a and the lower chamber 10b are defined as auxiliary cushion chambers because they also have a so-called air cushion function. In this case, the increase and decrease of the pressure in the auxiliary cushion chamber can be dealt with by the elastic deformation by the outer casing 10,
For example, as shown in FIG. 9, one or a plurality of pores H are provided on the projecting piece 14, and by using the pores H as orifices, an air cushioning function can be performed.

In addition to the circular shape shown in FIG. 9, the shape of the pores H is not limited to a circular shape as shown in FIG. The opening / closing control of the pore H may be performed accordingly. In addition, by making the cross-sectional shape of the protruding piece 14 on the shaft portion side or the entire cross-sectional shape asymmetrical up and down, the protruding piece 14 itself can perform a check valve-like operation, so that the space between the upper chamber 10a and the lower chamber 10b is reduced. It is also possible to give a characteristic to the buffering action in the above.

In the embodiment shown in FIGS. 1 to 3, a part of the shaft portion of the mounting screw 26 is cut off to form a groove portion 28 in order to further secure the locking state. Are combined. In addition to the shaft portion 27 of the mounting screw 26 as shown in the embodiment shown in FIGS. 1 to 3, the working portion 30 is provided in a stud bolt shape on the support frame 3 as shown in FIG. The pin 26a is raised, and the pin 26a is used as the shaft portion 27, and the action portion 30 can be provided in a part thereof. Also, as shown in FIG.
b can be separately attached, and this can be used as the shaft portion 27 and a part thereof can be used as the action portion 30.

The first embodiment of the insulator 1 according to the present invention further has a variation as shown in FIG. That is, in the embodiment shown in FIG. 8, only two compression coil springs 20 provided in the embodiment shown in FIGS. 1 to 3 are used, and the position where the projection piece 14 is provided is slightly higher than the constricted portion 13 in the outer casing 10. It is what it was. Specifically, the compression coil spring 20 is provided only below the projecting piece 14, and the projecting piece 14 provided above the projecting piece 14 is configured to be slightly inclined. The reason for providing the projecting piece 14 at an inclination in this manner is to compensate for the lack of resistance to external vibration due to the absence of the compression coil spring 20. Further, the compression coil spring 20 is provided on the lower side because the drive unit housing 5 is always supported and the external vibration transmitted to the support frame 3 is directly transmitted, and it is necessary to take a relatively large drag. It is.

Next, the operation of the first embodiment of the insulator 1 according to the present invention will be described with reference to the operation principle diagram shown in FIG. First, among the external vibrations transmitted to the support frame 3, small vibrations having a small vibration amplitude, as shown in FIG.
The protruding piece 14 which is in contact with its tip is bent and deformed with the contact portion as a fulcrum, thereby absorbing vibration. As shown in FIG. 6B, a compression coil spring 20 acts on external vibration having a larger vibration amplitude, and the compression coil spring 20 compresses and deforms, thereby absorbing vibration and buffering shock loads. . At this time, the vibration is also absorbed by compression or shear deformation of the outer casing 10 itself. In this case, when the compression coil spring 20 is compressed and deformed, a repulsive force associated with the compression deformation becomes a problem. However, the repulsive force is absorbed by the extension of the peripheral body portion 12 of the outer casing 10, so that the repulsive force adversely affects the vibration absorption characteristics. No worries.

[0050]

Second Embodiment That is, the second embodiment is shown in FIGS. The general configuration of the insulator 1 is the same as that of the first embodiment shown in the above-described first to third embodiments. However, the configuration of the projection piece 14 that performs the vibration absorbing action and the configuration of the shaft portion 27 are slightly different. That is, FIGS.
In the first embodiment shown in FIG. 10, the tip of the projecting piece 14 abuts on the shaft 27.
In the case of the embodiment shown in (1), the projection piece 14 is not in contact with the shaft portion 27 in a state where no vibration is generated.

More specifically, the working portion 30 of the shaft portion 27 of the mounting screw 26 is formed to have a slightly smaller diameter than the other shaft portions 27, and this working portion 30 is formed inside the outer casing 10. The projected piece 14 faces with a slight gap. Specifically, in this embodiment, the shaft portion 27 having a shaft diameter of 2 mm is provided at the action portion 30 at a shaft diameter of 1.9 mm.
The gap between the projecting pieces 14 facing this was set to 0.5 mm. The dimensions of these members vary depending on the size of the insulator 1 itself, and are not strictly limited to these numerical values. Therefore, the operation shown in the operation state described later is possible, and various dimensions can be set as long as a predetermined vibration absorbing effect can be expected.

In this embodiment, various modifications in which the structure of a part of the members described in the first embodiment is different can be adopted. Specifically, as shown in FIG. 5 (a), a plurality of protrusions 14 are provided, or as shown in FIGS. 5 (b) and 5 (c), a recess 14a or a bent portion 14b is provided in a part of the protrusions 14. It is also possible to form the protruding piece 14 in a shape as shown in FIG. 5D in which the vibration absorbing effect caused by the shearing deformation is increased more than the vibration absorbing effect caused by the bending deformation. 7A, a pin 26a raised from the support frame 3 is used as the shaft 27, and a spacer 26b is used as shown in FIG. 7B. You can also. In addition, as shown in FIG. 8, a modified example in which the installation position of the projection piece 14 is changed can be adopted.

Next, the operation of the second embodiment of the insulator according to the present invention will be described with reference to the operation principle diagram shown in FIG. First, with respect to an extremely small vibration transmitted to the support frame 3 with very small external vibration, the vibration is absorbed mainly by compression or shear deformation of the outer casing 10 itself. And as the external vibration increases,
Vibration absorption is performed by the action of the projection piece 14 and the shaft portion 27. That is, the horizontal direction component of the external vibration causes the protruding piece 14 to come into contact with the action portion 30 in the shaft portion 27. If external vibration in the axial direction occurs in this state, the first portion shown in FIGS. Projection piece 1 as in the embodiment
4 deforms flexibly, thereby absorbing vibration.

Also, with respect to the external vibration in the axial direction, the gap between the projecting piece 14 and the operating portion 30 of the shaft portion 27 acts as an orifice. Piece 1
Since the air in the upper chamber 10a and the lower chamber 10b, which are auxiliary cushion chambers formed on both sides of the air cushion 4, functions as an air cushion, vibration is also absorbed by the air cushion.

Further, against a larger external vibration, the compression coil spring 20 is used as in the first embodiment shown in FIGS.
The compression coil spring 20 is compressed and deformed, thereby absorbing vibration and buffering against an impact load.

[0056]

Third Embodiment That is, the third embodiment is shown in FIGS. The general configuration of the insulator 1 is the same as that of the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIGS. However, the configuration of the protrusion 14 that performs the suction action and the configuration of the shaft 27 are slightly different. That is, in the third embodiment shown in FIGS. 12 and 13, the vibration absorbing action due to the bending deformation of the projecting piece 14 in the first embodiment shown in FIGS.
According to the second embodiment, the vibration absorbing action by the orifice effect due to the gap formed between the projecting piece 14 and the shaft portion 27 can be selectively used depending on the position of the action portion 30 in the shaft portion 27. is there.

More specifically, the action portion 30 in the shaft portion 27
With the center being the minimum diameter, the shaft diameter is gradually increased toward the upper and lower ends to form a curved concave shape. But with a slight gap. In the middle of the action portion of the shaft portion 27 that gradually increases the shaft diameter, the dimension is set such that the projection piece 14 contacts the concave surface of the action portion 30.

In addition to the curved concave shape as shown in FIG. 12, the cross section area of the shaft portion 27 is gradually increased from the small diameter portion 30a to the tapered shape as shown in FIG. As shown in FIG.
a may be provided not at the center of the action portion 30 but at one side, and a curved concave surface or a tapered surface may be formed only in one direction from the small diameter portion 30a. In the case where the action portion 30 whose cross-sectional area gradually increases is applied to only one side as shown in FIG. 14B, the load of the drive unit housing 5 and the like is always applied to the outer casing 10. The small-diameter portion 30a is provided above the action portion 30, and is arranged so that the cross-sectional area of the shaft portion 27 gradually increases as it goes downward, and is used mainly to increase the resistance to the load applied downward. It is desirable.

Also in the present embodiment, various modifications in which the structure of a part of the members is different as described in the section of the first embodiment can be adopted. Specifically, as shown in FIG. 5 (a), a plurality of projections 14 are provided, or as shown in FIGS. 5 (b) and 5 (c),
4b can be provided, and the projection piece 14 can be formed in a shape as shown in FIG. 5D in which the vibration absorbing effect caused by the shearing deformation is increased more than the vibration absorbing effect caused by the bending deformation. In addition to using the mounting screw 26 as the shaft 27, a pin 26a raised from the support frame 3 is used as shown in FIG. 7A, or a spacer 26b is used as shown in FIG. 7B. You can also. In addition, FIG.
As shown in (1), a modified example in which the location of the projection piece 14 is changed can be adopted.

Next, the operation of the third embodiment of the insulator according to the present invention will be described with reference to the operation principle diagram shown in FIG. First, with respect to an extremely small vibration transmitted to the support frame 3 with very small external vibration, the vibration is absorbed mainly by compression or shear deformation of the outer casing 10 itself. Then, as the external vibration increases, the vibration is absorbed by the action of the projection 14 and the shaft 27. That is, the horizontal direction component of the external vibration causes the protruding piece 14 to come into contact with the action portion 30 in the shaft portion 27. If external vibration in the axial direction occurs in this state, the first portion shown in FIGS. Projection piece 1 as in the embodiment
4 deforms flexibly, thereby absorbing vibration.

Also, with respect to the external vibration in the axial direction, the gap between the projecting piece 14 and the operating portion 30 of the shaft portion 27 acts as an orifice, and is formed inside the outer casing 10 together with the compressive deformation of the outer casing 10. Since the air in the upper chamber 10a and the air in the lower chamber 10b work as an air cushion, the vibration is also absorbed by the air cushion.

When the external vibration further increases in the axial direction, the relative position between the projecting piece 14 and the operating portion 30 in the shaft portion 27 fluctuates, and the projecting piece 14 gradually increases the axial diameter of the operating portion 30 in a curved concave surface. , And the abutting portion serves as a fulcrum to perform a vibration absorbing action mainly due to the bending deformation by the projecting piece 14.

The compression coil spring 20 acts on even larger external vibrations as in the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIGS. The compression deformation of the spring 20 absorbs vibration and buffers shock loads.

[0064]

The insulator 1 of the present invention has the above-described configuration, and the following effects are exhibited by having such a configuration. First, the insulator 1 of the present invention is composed of only two articles consisting of the outer casing 10 and the compression coil spring 20, and has a relatively simple structure in which mounting screws 26 used for mounting are used for performing a vibration absorbing action. Therefore, it can contribute to miniaturization and weight reduction, and is most suitable as an insulator for a handy type CD player 2 as shown in FIG. In addition to absorbing vibration due to compression or shear deformation of the outer casing 10 itself,
The vibration absorption associated with the correlation between the shaft portion 27 and the shaft portion 27 is also combined, so that the vibration absorption characteristics can be improved.

In the case of the first embodiment shown in FIGS. 1 to 3, the projection 1 is formed by contacting the shaft 27.
Vibration is absorbed by the flexural deformation of No. 4 and the air cushion action in the auxiliary cushion chamber, so that the vibration absorbing characteristics can be improved as described above, and the assembly cost can be reduced because the members can be easily attached. It also helps to increase the resistance to the horizontal vibration component acting on the insulator 1, whereby it can be installed not only in the horizontal direction but also in the vertical direction, and the installation range is expanded. Furthermore, as compared with the case where the outer casing 10 is simply subjected to compression or shear deformation, the resonance magnification is slightly higher, but the vibration conductivity in a high frequency range is low, so that it is suitable for use mainly for absorbing vibration in a high frequency range.

In the case of the second embodiment shown in FIGS. 10 and 11, the gap between the projecting piece 14 and the operating portion 30 of the shaft portion 27 acts as an orifice, and the upper chamber 10a and the lower chamber 1
The air cushion in Ob acts to improve the vibration absorption characteristics. The attenuation characteristic shows a relatively gentle characteristic over the entire frequency range, and can be used in a wide range over almost the entire frequency range.

Further, in the case of the third embodiment shown in FIGS. 12 and 13, the vibration-absorbing action accompanying the bending deformation of the projection 14 in the first embodiment shown in FIGS. In the second embodiment shown, the vibration absorbing effect due to the air cushion effect is selected in accordance with the change in the relative position between the projection piece 14 and the operating portion 30, and the secondary vibration absorbing effect is performed.

In addition, when the projecting piece 14 is locked to the action portion 30, the pressure contact of the projecting piece 14 to the action portion 30 becomes more reliable, and the projecting piece 14 can be protruded against external vibration having a large vibration amplitude. The displacement of the contact portion of the tip of the piece 14 with the operating portion 30 can be prevented, and the projection piece 14 can be prevented from larger external vibration.
Vibration can be absorbed by the flexural deformation of the substrate.

Further, if the material of the outer casing 10 is constituted by a silicone gel composed of the above-mentioned components,
Higher damping vibration absorption characteristics are obtained, and the repulsive force of the compression coil spring 20 can be further suppressed.

Further, in the case where the compression coil springs 20 are provided one by one above and below the projection piece 14, not only the excessive amplitude acting downward but also the excessive amplitude acting upward can be suppressed. Since the structure is vertically symmetrical, assembly becomes easy. These effects act synergistically, so that an insulator having a simple structure, small size and light weight, and excellent vibration absorption characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a use state of a first embodiment of an insulator of the present invention.

FIG. 2 is an exploded perspective view showing the insulator in an enlarged manner;

FIG. 3 is a half longitudinal sectional view of the same.

FIG. 4 is a cross-sectional plan view showing another two examples in which the cross-sectional shapes of the projection pieces are different.

FIG. 5 is a longitudinal sectional side view showing other various embodiments in which the longitudinal sectional shapes of the projection pieces are different.

FIG. 6 is an operation principle diagram showing an operation state of the first embodiment of the insulator of the present invention.

FIG. 7 is a longitudinal sectional side view showing two types of embodiments in which a shaft portion is provided at different positions.

FIG. 8 is a semi-longitudinal sectional view showing another embodiment in which the positions at which the projection pieces are provided are different.

FIG. 9 is a longitudinal sectional view showing an embodiment in which a fine hole is provided in a projection piece.

FIG. 10 is a longitudinal sectional view showing a second embodiment of the insulator of the present invention.

FIG. 11 is an operation principle diagram of the same.

FIG. 12 is a longitudinal sectional view showing a third embodiment of the insulator of the present invention.

FIG. 13 is an operation principle diagram of the same.

FIG. 14 is a longitudinal sectional view showing two examples in which the shape of the action portion in the shaft portion is different.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 2 Compact disk player (CD player) 3 Support frame 4 Sub-frame 5 Driving part housing 6 Optical pickup 7 Sliding mechanism 8 Mounting port 9 Top cover 10 External casing 10a Upper chamber 10b Lower chamber 11 End face 11a Insertion port 12 Peripheral body 13 Neck Part 14 Projection piece 14a Depressed part 14b Bent part 15 Holding part 15a Holding part 15b Holding part 20 Compression coil spring 25 Washer 26 Mounting screw 26a Pin 26b Spacer 27 Shaft part 28 Groove part 30 Working part 30a Small diameter part M Disk motor A Compact disk H pore

Claims (10)

(57) [Claims] 1. A vibration absorbing member which is provided between two members to which vibration is transmitted to each other, absorbs the vibration, and attenuates the vibration. The vibration absorbing member compresses or shears its own shape to form a shaft. An outer casing that absorbs vibration generated in a direction or a direction perpendicular to the axis, and a compression spring that is compressed and contracted inside the outer casing. The outer casing has a substantially cylindrical shape and has an outer periphery in the axial direction. It has a constriction near the middle, and a projection protrudes toward the center inside the outer casing, and this projection cooperates with a shaft inserted into the outer casing during assembly to constitute an auxiliary vibration absorbing structure. An insulator, characterized in that: 2. The auxiliary cushion chamber, wherein the projection piece is combined with a shaft portion, so that the inside of the outer casing on both sides of the projection piece sandwiches the projection piece.
The insulator as described. 3. The insulator according to claim 2, wherein the auxiliary cushion chambers formed by sandwiching the projecting pieces inside the outer casing communicate with each other in an orifice shape at all times or during a constant operation. 4. The tip of the projection piece abuts on the shaft,
The insulator according to claim 1, 2 or 3, wherein the projection piece forms an auxiliary vibration absorbing structure by being bent and deformed. 5. The insulator according to claim 3, wherein the projection is provided with a slight gap with respect to the shaft, and the gap is used as an orifice. 6. The insulator according to claim 1, wherein an action portion of the shaft portion with the projection piece is formed by changing a cross-sectional area thereof in an entire range or a partial range thereof. . 7. The operation portion of the shaft portion with the projection piece is configured such that the cross-sectional area at any one point in the axial direction is minimized, and the cross-sectional area gradually increases in one direction or in the opposite direction to each other. In addition, at the position where the cross-sectional area is the minimum, at least the projection piece is provided with a slight gap with respect to the shaft part, and in the middle of the action part where the cross-sectional area gradually increases, the projection piece is at least The insulator according to claim 6, wherein the insulator is provided so as to be in contact with the insulator. 8. The insulator according to claim 4, wherein a tip end of the projection piece is supported in a locked state with respect to an action portion of the shaft portion. 9. The method according to claim 1, wherein the outer casing is made of silicone gel.
The shooter according to 3, 4, 5, 6, 7 or 8. 10. The compression spring according to claim 1, wherein one of said compression springs is provided in both directions with said projection piece interposed therebetween.
The insulator according to 2, 3, 4, 5, 6, 7, 8 or 9.