JP2967232B2 - Anti-vibration structure for precision equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Object of the Invention><Industrial Application Field> The present invention relates to precision equipment such as a CD player.
The present invention relates to a connection structure between a mount on which a precision member is mounted and a fixed frame.

<Background of the Invention> For example, in a CD player, since subtle vibration causes sound skipping, it is necessary to interrupt transmission of mutual vibration between the fixed frame and the gantry. Therefore, conventionally, as shown in FIG. 7, a spring 11 'is provided between a chassis 4' as a fixed frame and a frame 3 ', and a holding member 9' provided on the frame 3 'and a fixed frame chassis 4'. The vibration absorber 21 'was provided between the support member 13' and the vibration absorber 21 '. However, when the vibration absorber 21 'is simply provided in a donut shape around the support portion 13' as shown in FIG. 7, the vibration absorbing effect is large for vertical vibration, but is large for horizontal vibration. Therefore, there is a problem that such a vibration absorption effect cannot be obtained.

<Technical Issues Attempted to be Developed> The present invention has been made in view of such a background, and is a novel technique which can obtain a sufficient vibration absorbing effect not only in the vertical direction but also in the horizontal direction. The present invention relates to an anti-vibration structure in precision equipment and the like.

<< Effects of the Invention >><Means for Achieving the Object> The vibration isolating structure in the precision equipment or the like according to the first invention according to the present application includes a support member provided on a fixed frame and a holding member provided on a mount for mounting the precision equipment and the like In the structure that supports the gantry with respect to the fixed frame while blocking the mutual transmission of vibration between the fixed frame and the gantry by providing a vibration absorber between them, the vibration absorber has a rugged shape made of a gel-like substance. The center is fixed to the side peripheral surface of the support cylinder provided in the fixed frame at the center, while the side edge is the inner periphery of the holding member integrated with the gantry at a position below the center fixed position. It is characterized by being fixed to a surface.

Further, in addition to the above requirements, the vibration isolating structure in the precision equipment or the like according to the second invention according to the present application is provided with a spring member formed of a coil spring between the fixed frame and the gantry so as to surround a holding member. It is characterized by the following.

The present invention aims to achieve the above object.

<Effect of the Invention> In the present invention, since the vibration absorber is provided in a lump shape, a sufficient vibration absorbing effect can be obtained not only in the horizontal direction but also in the vertical direction by the elongation of the gel material.

<Example> Hereinafter, the present invention will be specifically described based on an illustrated example. Reference numeral 1 denotes a mechanical unit of a CD player to which the anti-vibration structure is applied in precision equipment or the like according to the present invention, and the mechanism unit 1 is a mount 3 on which an optical system block 2 as precision equipment is mounted as a fixed frame. It is attached to the chassis 4. The present invention relates to a connection portion 5 between the gantry 3 and the chassis 4.
Is applied to prevent transmission of vibration between the gantry 3 and the chassis 4. Hereinafter, a specific structure of the connecting portion 5 will be described with reference to FIGS. First, connection holes 6 are formed at three places in the gantry 3, and each of the connection holes 6 is formed with a cylindrical cover 7 on the lower surface side, and inside the cover 7, the lower surface of the connection hole 6 is formed. The bearing surface 8 is formed so as to surround the periphery of. Inside the bearing surface 8, a cylindrical holding member 9 having an edge 10 formed on the upper portion so as to extend the connection hole 6 is provided. This holding member 9
A spring 11 is externally fitted on the outer peripheral surface of the holding member 9, and an upper end of the spring 11 abuts on an edge 10 of the holding member 9 and is fixed. On the other hand, chassis 4
A female screw hole 12 cut from a female screw is formed at a position corresponding to the connection hole 6. A support cylinder 13 as a support portion is provided above the female screw hole 12, and a washer is provided.
A fixing screw 15 is passed through the upper part of the support cylinder 13 through the screw 14 and screwed into the female screw hole 12, so that the support cylinder 13 is attached to the chassis 4.
Has been fixed. The support cylinder 13 is provided with a vibration absorber 21 as will be described later. The support cylinder 13 is composed of two upper and lower parts in consideration of the operation when the vibration absorber 21 is provided. 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. A holding member 1 is provided at the bottom of the lower support cylinder 13b.
6 are integrally provided, and two claw portions 18 formed on the holding member 16 are inserted and fixed into insertion holes 19 formed on the chassis 4. Further, an upper portion of the holding member 16 is formed with an edge-shaped annular portion 20 formed in a tapered shape inside, and the lower portion of the spring 11 is fitted and fixed to the annular portion 20. Next, an anti-vibration structure between the support cylinder 13 fixed to the chassis 4 and the holding member 9 provided on the gantry 3 will be described. Between the lowermost part of the upper support cylinder 13a and the lowermost part of the holding member 9, a vibration absorber 21 made of a gel-like substance is provided in a lump shape as shown in FIGS. Providing the vibration absorber 21 in a bulk shape in this manner is a characteristic component of the present invention, and thereby prevents transmission of vertical and horizontal vibrations between the gantry 3 and the chassis 4. You can. Here, the provision of the vibration absorber 21 in a bulk shape means that the cross-sectional shape of the vibration absorber 21 is a parallelogram as shown in FIG. 4, and the joining surface 13c between the vibration absorber 21 and the support cylinder 13 and the holding member By shifting the joining surface 9c of the vibration absorber 9 and the vibration absorber 21 vertically, when the vibration absorber 21 is deformed vertically or horizontally, the deformed portions of the vibration absorbers 21a and 21b can directly escape. This means that the vibration absorber 21 is provided to have the spaces S ₁ and S ₂ . In respect to the vibration in the vertical direction as shown in FIG. 4 (a) ie For example, the present embodiment, the vibration absorbing member 21a of the deformed portion able to escape into the space S _1, whereas the horizontal direction of the vibration is vibration absorbing member 21b of the deformed portion as shown in FIG. 4 (b) is the space S ₂
Can escape.

Here, the gel-like substance constituting the vibration absorber 21 will be described. The gel substance applied in this embodiment is specifically a silicone gel. The silicone gel is made of a dimethyl siloxane component units, a diorganopolysiloxane used by [1] (hereinafter referred to as component _{^{A): RR 1 2 SiO- (R}} 2 2 SiO) n SiR 1 2 R ... [1] [where R is an alkenyl group, R ¹ is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and R ² is a monovalent aliphatic hydrocarbon group (of R ² Of which at least 50 mol% is a methyl group, and if it has an alkenyl group, its content is 10 mol% or less), and n is such that the viscosity of this component at 25 ° C. becomes 100 to 100,000 cSt. Is a number]
And an organohydrogenpolysiloxane having a viscosity of not more than 5000 cSt at 25 ° C. and having at least three hydrogen atoms directly bonded to one Si atom in one molecule (component B)
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 Si atoms in component B is adjusted to 0.1 to 2.0. Is an addition reaction type silicone copolymer obtained by curing the obtained mixture. The component A has a linear molecular structure. The alkenyl group R at both ends of the molecule is added to a hydrogen atom directly bonded to a Si atom in the component B to form a crosslink. A compound capable of forming a structure. The alkenyl group present at the molecular terminal is preferably a lower alkenyl group, and a vinyl group is particularly preferable 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 alkyl groups such as a methyl group, a propyl group, and a hexyl group. , A phenyl group and a fluoroalkyl group. In the above formula [1], R ² is a monovalent aliphatic hydrocarbon, and specific examples of such a group include alkyl groups such as methyl group, propyl group and hexyl group, and vinyl groups. Lower alkenyl groups. However, at least 50 mol% of R ² is a methyl group, when R ² is an alkenyl group is preferably an alkenyl group is the amount of 10 mol% or less. When the amount of the alkenyl group exceeds 10 mol%, the crosslinking density becomes too high and the density tends to be high. N is a viscosity of the component A at 25 ° C. is usually 100 to 1;
It is set to be in the range of 00,000 cSt, preferably 200 to 20,000 cSt. The component B is a crosslinking agent for the component A, and the hydrogen atom directly bonded to the Si atom is added 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 B component, and this organic group is usually a lower alkyl group such as a methyl group. Further, the viscosity of the component B at 25 ° C. is usually 5,000 cSt or less,
Preferably it is 500 cSt or less. Examples of such a B component include an organohydrogensiloxane in which both molecular terminals are blocked with a triorganosiloxane group, a copolymer of a diorganosiloxane and an organohydrogensiloxane, tetraorganotetrahydrogencyclotetrasiloxane, Copolymer siloxane composed of HR ¹ ₂ SiO 1/2 units and SiO 4/2 units, and HR ¹ ₂ SiO 1/2 units and R ¹ ₃ Si
Copolymer siloxanes consisting of O 1/2 units and SiO 4/2 units can be mentioned. However, in the above formula, R ¹ has the same meaning as described above. The ratio of the total molar amount of the alkenyl groups in the component A to the total molar amount of the hydrogen atoms directly bonded to Si in the component B is usually 0.1 to 2.0, preferably 0.1 to 1.0. It is manufactured by mixing and hardening the A component and the B component so as to be as follows. The curing reaction in this case is usually performed using a catalyst. As the catalyst used here, a platinum-based catalyst is suitable,
Examples include finely divided elemental platinum, chloroplatinic acid, platinum oxide, complex salts of platinum and olefins, platinum alcoholates, and complex salts of chloroplatinic acid and vinylsiloxane acid. Such a complex salt is generally used in an amount of 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 are cured by heating to produce the silicone gel used in the present invention. The silicone gel thus obtained usually has a penetration of 5 to 250 degrees as measured by JIS K (K-2207-1980, 50 g load). With the hardness of such a silicone gel, the amount of the component A can form a crosslinked structure with hydrogen atoms directly bonded to Si in the component B. As another method, it can be adjusted by previously adding a silicone oil having methyl groups at both ends in an amount within the range of 5 to 75% by weight based on the obtained silicone gel. 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, TOUGH-4, TOUGH-5, TOUGH-6 (manufactured by Toray Dow Corning Silicone), X32-902 / cat1300 (manufactured by Shin-Etsu Chemical Co., Ltd.), F250-121 (manufactured by Nippon Yunika) be able to. In addition, the above-mentioned A component, B
In addition to components and catalysts, pigments, curing retarders, flame retardants, fillers, etc. can be blended within a range that does not impair the properties of the silicone gel. Such materials include, for example, Philite (registered trademark) manufactured by Nippon Philite Co., Ltd., and Expancel (registered trademark) sold by Nippon Philite Co., Ltd. In the examples, a needle whose penetration was adjusted to 220 was used.

As described above, the vibration isolating structure in the precision equipment or the like according to the present invention shifts the joining surface 13c between the vibration absorber 21 and the support cylinder 13 and the joining surface 9c between the holding member 9 and the vibration absorber 21 vertically. It is characterized in that both vertical and horizontal vibrations are attenuated.
The present invention is applied to existing specifications used for CD players, but in the absence of such restrictions, various forms can be adopted for other parts without changing the basic structure of the present invention. Things. For example, what is shown in FIG. 5 is a simplified version of the above embodiment, in which a supporting cylinder 13 as a supporting portion is formed on a chassis 4 and a cylindrical auxiliary cylinder is formed around the supporting cylinder 13 at a lower portion. 24, a connection hole 6 is formed in the gantry 3, and a cylindrical holding member 9 having an edge 10 formed on the connection hole 6 is provided on the top of the connection hole 6, and between the auxiliary cylinder 24 and the holding member 9 is provided. Absorber made of gel-like material
21 is provided in a lump shape. A spring 11 is provided around the holding member 9, and a lower portion thereof is supported in an edge 23 of the auxiliary cylinder 24. By the way, with such a structure, the support cylinder 13 is integrated with the chassis 4 so that the stability is good. Also, since the support cylinder 13 is provided on the auxiliary cylinder 24, the vibration absorber 21 is formed in a lump shape between the support cylinder 13 and the holding member 9. It is easy to do the work of providing. In this embodiment, a soundproof member 25 is provided between the gantry 3 and the support cylinder 13. Incidentally, the soundproof member 25 has a soundproofing function by absorbing vibration of sound from a sound source such as a motor provided on the gantry 3. In addition, as the material of such a soundproof member 25, the above-mentioned gel-like substance can be applied.

As still another embodiment, a structure in which springs are provided in a composite manner as shown in FIG. 6 can be employed. That is, a cylindrical holding member 9 is provided below the connection hole 6 formed in the gantry 3, and below the holding member 9, a cylindrical intermediate support member 26 with a bottom that is slightly larger in diameter than the holding member 9. Is provided.
A vibration absorber 21 made of a gel-like substance is provided between the holding member 9 and the support cylinder 13 which is a support portion formed at the center of the intermediate support member 26, and a rim formed on the upper portion of the holding member 9 is provided. The spring 11 is provided so that the upper end and the lower end thereof are supported in the part 10 and the inside of the intermediate support member 26, respectively.
Further, a spring 11a is provided between the edge 27 formed on the intermediate support member 26 and the chassis 4 as a fixed frame so that the upper end and the lower end thereof are supported. By the way, in such a structure, since the spring is provided in a complex manner, in combination with the vibration absorber 21, a more effective vibration absorbing action is achieved.

The vibration isolating structure in the precision equipment and the like according to the present invention has the above-described structure. For example, when vibration generated outside is transmitted to the chassis 4, the vibration is absorbed by the vibration absorber 21. Vibration of the gantry 3 on which precision equipment is mounted is prevented.

<< Effects of the Invention >> In the present invention, since the vibration absorber 21 is provided in a bulk shape,
Since the vertical vibration is attenuated by the elongation of the gel-like material as the vibration absorber, it has a sufficient vibration absorption action for both horizontal and vertical vibration.If such a structure is applied to precision equipment, For example, in a CD player, sound skipping due to vibration can be further reduced, and a failure due to vibration of precision equipment can be avoided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which the anti-vibration structure of the present invention is applied to a mechanical part of a CD player, FIG. 2 is an exploded perspective view showing an enlarged main part of the same, and FIG. FIG. 4 is an explanatory view showing the relationship between the direction of the force acting on the vibration absorber and the deformed state of the vibration absorber, FIG. 5 is a longitudinal sectional view showing another embodiment, and FIG.
FIG. 7 is a longitudinal sectional view showing still another embodiment of the present invention, and FIG. 7 is a longitudinal sectional view showing a conventional vibration damping structure. 1; mechanical part 2; optical system block 3; gantry 4; chassis (fixed frame) 5; connection part 6; connection hole 7; cover part 8; bearing surface 9; holding member 9c; bonding surface 10; 11a; spring 12; female screw holes 13, 13a, 13b; support cylinder 13c; joining surface 14; washer 15; fixing screw 16; holding member 18; claw portion 19; insertion hole 20; annular portion, 21, 21a, 21b; vibration absorbing body 23; edge 24: auxiliary cylinder 25; soundproof member 26; the intermediate support member 27; edge S _1, S _2; space

Claims (2)

(57) [Claims] 1. A vibration absorber is provided between a supporting portion provided on a fixed frame and a holding member provided on a mount on which a precision instrument or the like is mounted, so that mutual vibration transmission between the fixed frame and the mount is interrupted. In the structure supporting the gantry with respect to the fixed frame, the vibration absorber has a lumpy shape made of a gel-like substance,
At its center, it is fixed to the side peripheral surface of the support cylinder provided in the fixed frame, while its side edge is fixed to the inner peripheral surface of the holding member integral with the gantry at a position below the center fixing position. An anti-vibration structure for precision equipment, etc. 2. A vibration isolating structure according to claim 1, wherein a spring member comprising a coil spring is provided between said fixed frame and said gantry so as to surround a holding member.