JPH0439438A - Vibration isolating structure in precision equipment or the like - Google Patents

Abstract

PURPOSE:To sufficiently absorb vibration in horizontal and vertical directions by providing an umbrella-shaped vibration absorber between a supporting part provided in a fixed frame and a holding member provided in a mounting bed. CONSTITUTION:A connection hole 6 is provided in a mounting bed 3 on which an accurate equipment is loaded, and a holding member 9 is provided by forming a supporting surface 8 in an internal surface of a cover part 7. A fixing screw 15 is screwed by forming an internal thread hole 12 corresponding to the connection hole 6 in a chassis 4 which is a fixed frame. A vibration absorber 21 is provided between the fixed frame and the holding member 9 and connected by providing a support cylinder 13 which is a supporting member. The vibration absorber 21 is formed in an umbrella shape. Accordingly, the vibration absorber escapes to a space S1 relating to vibration in the vertical direction and to a space S2 relating to vibration in the horizontal direction. Thus, sufficient vibration absorbing action is displayed in both the horizontal and vertical directions.

Description

[Detailed Description of the Invention] (Object of the Invention) <Industrial Application Field> The present invention is applicable to precision equipment such as CD players, etc.
The present invention relates to a connection structure between a pedestal on which a precision member is mounted and a fixed frame.

<Background of the Invention> For example, in a CD player, subtle vibrations cause sound skipping, so it is necessary to block mutual transmission of vibrations between the fixed frame and the mount. Therefore, conventionally, as shown in Fig. 8, in addition to providing a spring 11° between the fixed frame chassis 4° and the pedestal 3", a spring 11° was provided between the holding member 9° provided on the pedestal 3" and the fixed frame chassis 4". A vibration absorber 21'' was provided between the support part 13'. However, if the vibration absorber 21' is simply provided in a donut shape around the support part 13° as shown in Figure 8, the vibration absorption effect is large against vertical vibrations, but it is not effective against horizontal vibrations. However, there was a problem in that the vibration absorption effect could not be obtained as much.

<Technical matters attempted to be developed> The present invention was made in view of the above background, and
The present invention relates to a vibration isolation structure for a new precision instrument, etc., which is able to obtain a sufficient vibration absorption effect not only in the vertical direction but also in the horizontal direction.

(Structure of the Invention) <Means for Achieving the Object> The vibration isolation structure for a precision instrument, etc., which is the first invention of this application, consists of a support part provided on a fixed frame and a holding member provided on a pedestal on which the precision instrument, etc. is mounted. A structure in which the pedestal is supported with respect to the fixed frame while blocking mutual vibration transmission between the fixed frame and the pedestal by providing a vibration absorber between them, characterized in that the vibration absorber is provided in the shape of an umbrella. It is something.

Further, the second invention of the present application, which is a vibration isolation structure for a precision instrument, is characterized in that, in addition to the above-mentioned requirements, the vibration absorber is a gel-like substance.

Further, the third invention of the present application, which is a vibration isolation structure for a precision instrument, is characterized in that, in addition to the above-mentioned requirements, a spring member is provided between the fixed frame and the pedestal.

These inventions attempt to achieve the above object.

<Action of the Invention> In the present invention, since the vibration absorber is provided in the shape of an umbrella, a sufficient vibration absorption effect can be obtained not only for vibrations in the horizontal direction but also in the vertical direction.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 indicates a mechanical part of a CD player to which the anti-vibration structure of precision equipment, etc., according to the present invention is applied, and in this mechanical part 1, a mount 3 on which an optical system block 2, which is a precision equipment, is mounted serves as a fixed frame. It is attached to the chassis 4. The present invention provides a connecting portion 5 between the frame 3 and the chassis 4.
This prevents transmission of vibration between the frame 3 and the chassis 4. The specific structure of this connecting portion 5 will be explained below based on FIGS. 1 to 3. First, connection holes 6 are formed in three places in the pedestal 3, and a cylindrical cover 7 is formed on the bottom side of each of these connection holes 6. A bearing surface 8 is formed so as to surround the periphery.

A cylindrical holding member 9 having an edge 10 formed on its upper part is provided below the support surface 8 so as to extend the connection hole 6 . A spring 11 is fitted onto the outer peripheral surface of the holding member 9, and the upper end of the spring 11 abuts against and is fixed to the edge 10 of the holding member 9. On the other hand, a female threaded hole 12 is formed in the chassis 4 at a position corresponding to the connection hole 6. At the top of this female threaded hole 12 is a support cylinder 1 which is a support part.
3 is provided, and the support cylinder 13 is fixed to the chassis 4 by passing a fixing screw 15 through the upper part of the support cylinder 13 through a washer 14 and screwing it into the female screw hole 12. The support cylinder 13 is provided with a vibration absorber as described later, but in consideration of the work required to provide the vibration absorber, the support cylinder 13 consists of two parts, an upper and a lower part. Hereinafter, when it is necessary to distinguish between the upper and lower support cylinders 13, the upper side is defined as the support cylinder 13a, and the lower side is defined as the support cylinder 13b.

Further, a holding member 16 is integrally provided at the bottom of the lower support cylinder 13b, and two claws 18 formed on this holding member 16 are inserted into insertion holes 19 formed in the chassis 4 and fixed. It is now possible to do so. Furthermore, an edge-shaped annular part 20 tapered inward is formed on the upper part of this holding member 16, and the lower part of the spring 11 is fitted into and fixed to this annular part 20. Next, a vibration isolation structure between the support cylinder 13 fixed to the chassis 4 in this manner and the holding member 9 provided on the pedestal 3 will be explained. Between the lowest part of the upper support cylinder 13a and the lowest part of the holding member 9,
As shown in FIGS. 1 to 3, a vibration absorber 21 made of a gel-like substance
is provided in the form of an umbrella. Providing the vibration absorber 21 in an umbrella shape as described above is a characteristic component of the present invention, and thereby prevents the transmission of vibrations in the vertical and horizontal directions between the pedestal 3 and the chassis 4. It can be done. Here, providing the vibration absorber 21 in an umbrella shape means that the joint surface 13c between the vibration absorber 21 and the support cylinder 13, as shown in FIG.
By vertically shifting the joint surfaces 9C between the holding member 9 and the vibration absorber 21.

When the vibration absorber 21 is deformed in the vertical or horizontal direction,
This means that the vibration absorber 21 is provided so that it has spaces S1 and S2 through which the deformed portions of the vibration absorber 21a and 21b can directly escape. That is, for example, in this embodiment, for vibrations in the vertical direction, the vibration absorber 21a can escape into the space S, and for vibrations in the horizontal direction, the vibration absorber 21a can escape into the space S.
The portion 1b can escape to the space S2.

Further, as another embodiment in which the vibration absorber 21 is provided in an umbrella shape,
As shown in FIG. 5, the joint surface 13c between the vibration absorber 21 and the support cylinder 13 may be shifted downward from the joint surface 9C between the holding member 9 and the vibration absorber 21. In such a configuration, Vertical vibrations are attenuated by the compression of the gel material in the vibration absorber 2, so it is not necessarily expected to attenuate vertical vibrations like the vibration absorber 21 shown in Figures 1 to 3 above. Regarding vibrations, it has a sufficient vibration damping effect. The gel-like material constituting the vibration absorber 21 will now be explained. Specifically, the gel-like material used in this embodiment is silicone gel. This silicone gel is composed of dimethylsiloxane component units and has the linear formula H
Diorganopolysiloxane used in (hereinafter referred to as component A): RR'2S IO (R22S IO) nS i R
'zR-...[1] [However, R is an alkenyl group, R1 is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and R2 is a monovalent aliphatic hydrocarbon group (R2 at least 50 mol% of
is a methyl group, and if it has an alkenyl group, its content is 10 mol% or less), and n is the viscosity of this component at 25°C of 100-100.000 cS.
t], the viscosity at 25°C is 5000 cSt or less, and there are at least 3
organohydrodiene polysiloxane (component B) having a hydrogen atom directly bonded to six Si atoms,
And the ratio (molar ratio) of the total amount of alkenyl groups contained in component A to the total amount of hydrogen atoms directly bonded to the 81 atoms in component B is adjusted to be 0.1 to 2.0. This is an addition reaction type silicone copolymer obtained by curing a mixture of To explain this silicone gel in more detail, component A has a linear molecular structure, and alkenyl groups R at both ends of the molecule.
is a compound that can form a crosslinked structure by adding with the hydrogen atom directly bonded to the 81 atom in component B. The alkenyl group present at the end of the molecule is preferably a lower alkenyl group, and a vinyl group is particularly preferred in consideration of reactivity. It is a hydrocarbon group, and specific examples of such groups include alkyl groups such as methyl, propyl, and hexyl groups, phenyl groups, and fluoroalkyl groups. In the above [Formula 11], R2 is a monovalent aliphatic hydrocarbon, and specific examples of such groups include alkyl groups such as methyl, propyl, and hexyl groups, and lower alkenyl groups such as vinyl groups. The following groups can be mentioned. However, at least 50 mol% of R2 is a methyl group, and when R2 is an alkenyl group, the amount of the alkenyl group is preferably 10 mol% or less, and the amount of the alkenyl group is 10 mol% or less.
If it exceeds mol%, the crosslinking density becomes too high and the viscosity tends to become high. Further, D is set so that the viscosity of this component A at 25°C is usually in the range of 100 to 100.000 cSt, preferably 200 to 20,000cSt. The above component B is a crosslinking agent for component A, and hydrogen atoms directly bonded to Si atoms add to the alkenyl group in component A to harden component A. It is sufficient that the B component has the above-mentioned effect, and the B component can have various molecular structures such as a linear bibranched chain, a ring, or a network. Further, in addition to a hydrogen atom, an organic group is bonded to the Si atom in component B, and this organic group is usually a lower alkyl group such as a methyl group. Furthermore, the viscosity of component B at 25°C is usually 5000
c8 or less, preferably 500 cSt or less.

Examples of the above-mentioned components include organohydrodienesiloxane in which both molecular ends are capped with triorganosiloxane groups, copolymers of diorganosiloxane and organohydrogensiloxane, tetraorganotetrahydrodienecyclotetrasiloxane, HR '2s
A copolymer siloxane consisting of l 0 1/2 units and 5i04/2 units, and HR".5i01/2 units and R'
A copolymer siloxane consisting of 3Si01/2 and 3Si04/2 units can be mentioned. However, in the above formula, R1 has the same meaning as 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 usually 0.1 to 2.0, preferably 0. It is manufactured by mixing and curing component A and component B so that the ratio falls within the range of 1 to 1.0. The curing reaction in this case is usually carried out using a catalyst. The catalyst used here is preferably a platinum-based catalyst, examples of which include finely ground elemental platinum, chloroplatinic acid, platinum oxide, complex salts of platinum and olefins, platinum alcoholade, and chloroplatinic acid and vinylsiloxic acid. Examples include complex salts with. Such complex salts usually have O8i based on the total weight of component A and component B.
ppm (in terms of platinum, the same applies hereinafter) or more, preferably 0.
It is used in an amount of 5 ppm or more. There is no particular restriction on the upper limit of the amount of such catalyst, but for example, when the catalyst is in liquid form or can be used as a solution, an amount of 200 ppm or less is sufficient.

Component A, component B, and catalyst as described above are mixed and allowed to stand at room temperature or are cured by heating to produce the silicone gel used in the present invention. The silicone gel thus obtained is JIS K (K-2
The penetration, measured at 207-198050g load), usually has a range of 5 to 250 degrees. Such a hardness of the silicone gel allows the amount of the above-mentioned A component to form a crosslinked structure with the hydrogen atoms directly bonded to Si in the B component. In another method, silicone oil having methyl groups at both ends is added in an amount of 5 to 75% by weight based on the resulting silicone gel.
It can be adjusted by adding in advance an amount within the range of . The silicone gel can be prepared as described above, or a commercially available silicone gel can also be used. Examples of commercially available products that can be used in the present invention include CF3027, TOUGH-3, TOU
GH-4, TOUGH-5, T.

UGH-6 ()-manufactured by Dow Corning Silicone Company)
, X32-902/cat 1300 (manufactured by Shin-Etsu Chemical Co., Ltd.), F25O-121 (manufactured by Nippon Unica Co., Ltd.), and the like. In addition to the above A component, B component and catalyst, pigments, curing retardants, flame retardants, fillers, etc. can also be blended within a range that does not impair the properties of the dinocone gel. A silicone gel formed by mixing may also be used, and in such a material, Phyllite (registered trademark) manufactured by Nippon Phyllite Co., Ltd.
Examples include Expancel (registered trademark) sold by the same company. In addition, in the examples, one whose penetration was adjusted to 220 was used.

As described above, the vibration isolation structure for precision instruments and the like according to the present invention is constructed by vertically shifting the joint surface 13c between the vibration absorber 21 and the support cylinder 13 and the joint surface 9c between the holding member 9 and the vibration absorber 21. It is characterized by damping vibrations in both the vertical and horizontal directions, and the embodiment described above is an application of the present invention to the existing specifications conventionally used in this type of CD player. In the case where there are no restrictions, other parts of the present invention may take various forms without changing the basic structure of the present invention.
The one shown in the figure is a simpler version of the embodiment described above, in which a support cylinder 13 serving as a support part is formed on the chassis 4,
A cylindrical auxiliary cylinder 24 with an edge 23 formed on the lower part is provided around it, and a connecting hole 6 is formed in the pedestal 3, and a cylindrical auxiliary cylinder 24 with an edge 10 formed on the upper part of the connecting hole 6 is provided around it. A holding member 9 is provided, and a vibration absorber 21 made of a gel-like substance is provided between the auxiliary cylinder 24 and the holding member 9 in the form of an umbrella. Further, a spring 11 is provided around the holding member 9, and a lower portion of the spring 11 is supported within the edge 23 of the auxiliary cylinder 24. Incidentally, if such a structure is used, the support cylinder 13
Since it is integrated with the chassis 4, stability is good, and since the support cylinder 13 is provided with an auxiliary cylinder 24, it is easy to install the vibration absorber 21 in an umbrella shape between the support cylinder 13 and the holding member 9. Further, in this embodiment, a soundproof member 2 is provided between the pedestal 3 and the support cylinder 13.
5 will be provided. Incidentally, this soundproofing member 25 has a soundproofing effect by absorbing sound vibrations from a sound source such as a motor provided on the pedestal 3. Note that the above-mentioned gel-like substance can be used as a material for such a soundproofing member 25.

Furthermore, as another embodiment, a structure in which multiple springs are provided as shown in FIG. 7 can be adopted.

That is, a cylindrical holding member 9 is provided below the connection hole 6 formed in the pedestal 3, while a holding member 9 is provided below this holding member 9.
An intermediate support member 26 having a bottomed cylindrical shape and having a slightly larger diameter is provided.

A vibration absorber 21 made of a gel-like substance is provided in an umbrella shape between the support cylinder 13 which is a support portion formed at the center of the intermediate support member 26 and the holding member 9, and an edge formed on the upper part of the holding member 9 is provided. A spring 11 is provided inside the portion 10 and the intermediate support member 26 so that its upper and lower ends are supported, respectively, and an edge portion 2 formed on the intermediate support member 26 is provided.
A spring lla is provided between the spring 7 and the chassis 4, which is a fixed frame, so that its upper end and lower end are respectively supported. Incidentally, although such a structure has multiple springs,
In combination with the vibration absorber 21, this provides an even more effective vibration absorbing effect.

The vibration isolation structure for precision instruments and the like according to the present invention has the above structure. For example, when vibrations generated externally are transmitted to the chassis 4, the vibrations are absorbed by the vibration absorber 21. To prevent vibration of the pedestal 3 on which precision equipment is mounted.

(Effect of the invention) In the present invention, since the vibration absorber 21 is provided in an umbrella shape,
It has a sufficient vibration absorbing effect against both horizontal and vertical vibrations, and if this type of structure is applied to precision equipment, for example, CD players can further reduce sound skipping due to vibrations. Failures caused by equipment vibration can be avoided.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment in which the vibration isolation structure of the present invention is applied to the mechanical part of a CD player, Fig. 2 is an exploded perspective view showing the main parts of the same on an enlarged scale, and Fig. 3 is a longitudinal sectional view of the same. , FIG. 4 is an explanatory diagram showing the relationship between the direction of the force acting on the vibration absorber and the deformation state of the vibration absorber, and FIG. 5 is a longitudinal sectional view showing another embodiment in which the vibration absorber is installed in a different manner. FIG. 6 is a vertical sectional view showing another embodiment of the same as the above. FIG. 7 is a longitudinal sectional view of another embodiment of the same. FIG. 8 is a longitudinal sectional view of a conventional vibration isolation structure. 1; mechanism part 2; optical system block 3; pedestal 4; chassis (fixed frame) 5; connection part 6; connection hole 7; cover part 8; support surface 9; holding member 9C; joint surface 0; edge 1; lla; Spring 2; Female screw holes 3.13a, 13b; Support cylinder 3C; Joint surface 4; Washer 5; Fixing screw 6; Holding member 8; Claw portion 9: Insertion hole O, annular portion 1, vibration absorber 3, edge Part 4, auxiliary cylinder 5, soundproofing member 6, intermediate support member 7, edge 1, S2;

Claims (3)

[Claims] (1) By providing a vibration absorber between the support part provided on the fixed frame and the holding member provided on the pedestal on which precision equipment is mounted, the fixed frame can be fixed while blocking mutual vibration transmission between the fixed frame and the pedestal. A vibration isolation structure for a precision instrument, etc., characterized in that the vibration absorber is provided in the shape of an umbrella in a structure for supporting a frame against a frame. (2) The vibration isolation structure for a precision instrument or the like according to claim 1, wherein the vibration absorber is a gel-like substance. (3) The vibration isolation structure for a precision instrument or the like according to claim 1 or 2, characterized in that a spring member is provided between the fixed frame and the pedestal.