JP2715380B2 - Abrasive work holder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polishing work holder for holding a lens to be polished used in a lens polishing machine.

[Prior Art] As a technique relating to this kind of work holder for polishing, there are techniques disclosed in Japanese Patent Application Laid-Open Nos. 61-11862 and 62-37627.

In the former, as shown in FIG. 7, the polishing plate 30 is rotated and swung, and a polishing holder 33 rotatably mounted on a housing 31 via a bearing 32 is vertically fixed from the spherical center of the polishing plate 30. When the lens 34 is polished by applying pressure and pressure, an elastic machine 35 is attached to the tip of the polishing holder 33 so that the lens 34 between the polishing plate 30 and the polishing holder 33 is elastically pressed.

As shown in FIG. 8, the latter has a lens polishing rod having a lens driving rod 37 which moves in the horizontal direction while pressing the surface while always turning vertically against the surface of the polishing dish 36 which rotates vertically. A lens holding device used in the machine, and an inverted cup-shaped body 38 rotatably attached to a distal end portion of a lens driving rod 37, and detachably fitted into the inverted cup-shaped body 38, A lens holder 40 which is in contact with the inverted cup-shaped body 38 via an elastic ring 39 so as to be tilted by a small angle, and a concave portion formed to fit and hold a lens 41 on the lower surface of the lens holder 40 42 and a suction hole for sucking the lens 41 in the lens holder 40 by vacuum.

[Problems to be solved by the invention]

However, the former technique (Japanese Patent Application Laid-Open No. 61-11862) does not have a mechanism for restricting the movement of the lens 34 in the radial direction. As a result, the lens 34 is pulled in the radial direction, so that there is a problem that the axis is largely shifted.

In this regard, in the technique disclosed in the latter (Japanese Patent Laid-Open No. 62-37627), the movement of the lens 41 in the radial direction is restricted by the lens holder 40, but the lens holder 40 is made of rubber or the like. Since it is vacuum-adsorbed to the inverted cup-shaped body 38 through the elastic material 39, the entire lens holder is diametrically moved due to the polishing resistance during the polishing as in the technique of JP-A-61-121862. And the axis of the lens 41 is displaced. When grinding is performed during such a phenomenon, the elastic material 39 is compressed by the inverted cup-shaped body 38 and the lens holder 40, so that the movement of the lens,
That is, the horizontal movement of the lens receiver and the vertical minute displacement cannot be absorbed. As a result, the lens flaps during the processing, making it impossible to process or extremely degrading the processing surface accuracy, which is a major cause of frequent occurrence of defective products.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and eliminates flapping of a lens during polishing, and provides a polishing work holder capable of efficiently obtaining a high-quality lens with excellent processing surface accuracy. The purpose is to provide.

[Means and actions for solving the problem]

The work holder for polishing according to the present invention is rotatably supported by the housing, has a concave portion formed on one end face on the rotation axis, and has a suction hole opened on the end face, and a coaxial body with the holder main body. A fixing ring which is fixed and which is loosely fitted to the outer peripheral surface of the lens or the outer peripheral surface of the lens receiver such that the inner diameter portion of the end restricts the movement of the lens in the radial direction, and one end surface of which faces the concave portion of the holder body. A lens receiver having a concave portion and having a suction hole communicating with the suction hole so as to adsorb and support one of the lens surfaces of the lens at the other end surface, between the concave portion of the holder body and the concave portion of the lens receiver; A spherical body that is disposed and is capable of tilting the lens receiver and moving in the radial direction by point contact with the bottom surface of each recess, and is disposed between the holder body and the lens receiver and outside the suction hole. And a seal material for sealing.

Therefore, when performing polishing while adsorbing and supporting the lens on the work holder for polishing, the lens that holds the lens by suction due to the rolling of the sphere that is in point contact with the concave part of the holder body and the concave part of the lens receiver The movement in the diameter (lateral) direction of the receiver becomes smooth, and the deviation from the axis of the lens due to the abrasive resistance is absorbed with good followability. In addition, due to the inclination of the lens receiver centered on the sphere, the minute vibration displacement caused by the inclination and rotation of the lens due to the polishing resistance is absorbed with good followability. Therefore, no flapping occurs during processing.

Also, in the polishing work holder, a sphere disposed between the holder main body and the lens receiver is brought into point contact within a recess formed by the axis of the lens receiver,
Since the outer peripheral edge of the lens surface to be polished (the surface to be processed) is close to the spherical center of the sphere, the contact angle in the polishing is reduced, and more stable polishing is performed.

Furthermore, by making the O-ring having elasticity fit into the sphere while making the bottom surface of the sphere point-contact with the sphere in the concave portion of the holder main body or the concave portion of the lens receiver in which the sphere is disposed, The axis center of the lens receiver can be easily adjusted.

The rubber hardness of the O-ring in this configuration is desirably not more than 70 ° and up to about 30 ° from the viewpoint of easiness of deformation and resilience of the O-ring.

〔Example〕

Hereinafter, the present invention used in a lens polisher will be described based on examples. In the following description, the first
The same components as those shown in the drawings are denoted by the same reference numerals, and description thereof will be omitted.

(First Embodiment) FIG. 1 shows a first embodiment of a polishing work holder 1 according to the present invention.
It is sectional drawing which shows an Example.

In FIG. 1, a polishing work holder 1 has a holder body 3 rotatably supported in a housing 2 attached to a lens polishing machine (not shown). That is, a pair of upper and lower bearings (radial bearings) 5 are attached to the holder main body 3 on the outer periphery of the main body shaft via the collar 4 by the fixing screws 6, and the bearings (thrust bearings) are provided by the fixing screws and the steps in the housing 2. 7), the holder body 3 is tightened so that the V ring 8 for sealing is pressed and fixed, and the ring 9 is supported on the housing 2 by screwing. In addition, a suction hole 10 communicating with a suction pump (not shown) is provided in an axis portion of the housing 2, and V is connected to a suction hole 11 in an axis portion of the holder main body 3.
Suction holes are also provided in the axis portions of the ring 8 and the fixing screw 6, respectively, and the suction holes 11 are branched in four directions and opened in a large diameter portion (lower portion of the main shaft portion) of the holder body 3. ing.

A concave portion 12 having the same diameter is formed in the axial center portion of the lower surface of the large diameter portion of the holder body 3, and the outside of the suction hole 11 opened in the lower surface is cut out in a ring shape. Screw portion 13 provided on the outer peripheral surface of the large diameter portion of holder body 3
The threaded portion of the fixing ring 14 is screwed into. The diameter of the central portion inside the fixing ring 14 is larger than the inner diameter of the lower end 14a of the fixing ring.

On the lower side of the holder body 3, a flange portion 17a of a lens receiver 17 for supporting a lens 16 as a member to be polished is provided.
Are formed so as to be locked at the lower end portion 14a of the fixing ring 14. The upper surface of the lens receiver 17 (the upper surface on the flange side in the figure) is a flat surface, and the lower surface has a convex portion for receiving a lens for adsorbing and supporting the lens (a convex portion having a receiving surface corresponding to the curvature of the supporting lens surface). 18) is formed,
The outer peripheral surface has a step portion and the flange portion of the step portion
17a is locked at the lower end 14a of the fixing ring 14, the small-diameter portion 17b of the step is loosely fitted to the lower end 14a of the fixing ring, and the lens 16 held by suction is set to an appropriate gap. In the example, a range in which the holder can be tilted by 3.5 ° via the lens receiver 17 with respect to the axis of the holder body 3 is set.
(In the figure, the outer peripheral surface of the lens is in contact with the inner wall surface of the lower end of the fixing ring, but may be in contact with the small diameter portion of the lens receiver.) (Corresponding to the axis of the holder body), a concave portion 19 having the same diameter, and a suction hole 20 communicating with the upper and lower surfaces of the lens receiver.
Is provided.

Between the concave portion 19 of the lens receiver 17 and the concave portion 12 of the holder main body 3, a steel that is in point contact with the bottom surface of each of the concave portions 19, 12 so as to tiltably support the lens receiver 17 with respect to the holder main body. The ball 21 is provided, and the elastic hardness
60 O-rings 22 and 23 are disposed so as to be in contact with the steel ball 21 and the inner wall surfaces of the recesses 19 and 12, and a sealing V-ring 24 is disposed in the annular cutout of the holder body. I have.

Therefore, the suction hole 1 of the housing 2 and the holder body 3
When the lens 16 is attracted to the lens receiver 17 through the holes 0 and 11, the flange portion 17a of the lens receiver is separated from the lower end portion 14a of the fixing ring 14 due to the negative pressure. Is tiltable and movable in the radial direction (lateral direction).

When the lens 16 is polished using the polishing work holder 1 having the above configuration, the lens 16 to be polished is mounted on the lens receiving projection 18 of the lens receiver 17 and the holder body 3 is polished. Via a suction hole 11 of the lens receiver 17 and a suction hole 20 of the lens receiver 17, the suction pump (not shown) is driven to suck and hold.

At this time, as described above, the flange portion 17 of the lens
Since a is separated from the lower end 14a of the fixing ring 14, the lens receiver can be freely tilted with respect to the axis of the holder main body and can easily move in the radial direction.

Next, the lens 16 sucked and held by the polishing work holder is pressed against a polishing grindstone (not shown) of a lens polishing machine disposed below the lens 16 to perform polishing.

According to the configuration of the present embodiment, even if the lens 16 is to be displaced in the radial direction during the polishing process, the lens holder 17 is smoothly moved by the rolling of the steel ball and the bottom surface of each concave portion of the holder body and the lens 16 receiver. The whole can be moved in the radial direction.

At this time, the amount of movement of the lens receiver in the radial direction is regulated along with the regulation of the tilt angle of the lens receiver and the lower end 14
Performed at a.

Even if the lens 16 is displaced by the minute vibration due to the tilt and rotation within the restricted (limited) range, the concave portion 12 of the holder body 3 and the concave portion 19 of the lens receiver 17 are interposed between them. Due to the point contact with the steel ball 21, it can be absorbed with good followability.

As a result, flapping of the lens 16 during polishing is reliably prevented, and a high-quality lens having an excellent degree of processing area can be obtained.

Further, even if the lens receiver is inclined or moved in the radial direction with respect to the holder main body, the elasticity of the O-ring disposed around the steel ball causes a restoring action, and it is possible to prepare for a later-mentioned lens displacement or the like. .

Furthermore, after the polishing of one lens is completed, the axis of the lens receiver and the axis of the holder body match, so
The position of the convex portion for receiving the lens is fixed, and the work of mounting and taking out the lens is stabilized.

Second Embodiment FIG. 2 is a sectional view showing a second embodiment of the polishing work holder 1 according to the present invention. The feature of this embodiment is as follows.
In the concave portion 12 formed at the axis of the holder body 3 in the first embodiment shown in the drawing, the bottom surface of the concave portion 12 is
Spherical surface concentric with the center of curvature of the surface to be polished (the surface to be polished)
25. Then, the bottom surface (flat surface) of the concave portion 19 formed in the lens receiver 17, the spherical surface 25 of the concave portion 12 of the holder body 3 and the steel ball 21 are arranged, and the O-rings 22 and 23 are brought into contact with the steel ball 21. ing.

The other configuration is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof will be omitted.

Although the same effect as that of the first embodiment can be obtained in the above configuration, according to the polishing work holder of the present embodiment, the movement of the lens receiver 17 includes tilting around the steel ball 21 and radial movement. In addition, the lens 16 can be moved along the surface to be polished, and the convex spherical surface 2 in the concave portion 12 of the holder body is provided.
5. Due to the contact with the spherical surface of the steel ball 21, the absorbability of the displacement of the lens 16 during the polishing is further improved, and the precision of the machined surface is further improved.

In this embodiment, the bottom surface of the concave portion 12 of the holder body 3 is formed into a spherical surface 25 concentric with the surface to be polished of the lens, and
The bottom surface of the concave portion 19 of the holder body is flat,
The same effect can be obtained by making the bottom surface of 12 a flat surface and making the bottom surface of the concave portion 19 of the lens receiver 17 a spherical surface (concave spherical surface) concentric with the surface to be polished of the lens. O-ring 22 in recess 19 can be removed due to the centering action.

Further, if the bottom surface of the concave portion 12 of the holder body is a convex spherical surface and the bottom surface of the concave portion 19 of the lens receiver is a concave spherical surface, the absorbability of the lens displacement during polishing is further improved, and the processing surface accuracy is further improved. be able to.

In the above embodiment, the polished surface of the lens to be polished is convex, but the same can be said for a polished surface which is concave.

That is, as shown in FIG. 3, both the bottom surface of the concave surface 12 of the holder body 3 and the bottom surface of the concave portion 19 of the lens receiver 17
The lens 16 has a spherical surface concentric with the center of curvature of the surface to be processed. Also in this case, the tilting of the lens receiver 17 is promoted by point contact with the steel ball 21, and the movement of the lens receiver 17 along the processing surface of the lens 16 is caused by the sliding of the steel ball 21 and the recesses 12 and 19 and the steel ball 21. Facilitated by ball rolling.

Therefore, the same effect as described above can be obtained. 2, the O-ring in the recess 12 of the holder body 3 can be removed in the same manner as described above.

Further, if the bottom surface of the concave portion 12 of the holder body 3 is formed as a convex spherical surface 25 centered on the axis as shown in FIG. 4, the movement of the lens receiver 17 is further promoted, and the displacement of the lens 16 during polishing is further improved. The absorptivity is improved, and the polished surface of the lens is not restricted to a concave surface or a convex surface.

Third Embodiment FIG. 5 is a sectional view showing a third embodiment of the polishing holder according to the present invention.

The present embodiment is characterized in that both the concave portion 12 of the holder main body 3 and the concave portion 19 of the lens receiver 17 are constituted by concave spherical surfaces 27 and 28 having centers on the rotation axis of the holder main body 3. The concave spherical surface 27 of the holder body 3 is a lens
It is concentric with 16 work surfaces.

Also in the present embodiment, the tilting of the lens is promoted by the point contact between the steel ball 21 and the concave spherical surfaces 27 and 28, and the radial movement is promoted by the rolling of the steel ball.
Can be absorbed with good followability, and high-precision lens polishing is performed.

Since the concave spherical surface has a centering action similarly to the above embodiment, an O-ring is not required.

Fourth Embodiment FIG. 6 is a sectional view of a polishing work holder showing a fourth embodiment according to the present invention. In this embodiment, a first concave portion 29 is formed on the upper surface of the lens receiver 17 by spot facing, and a steel ball 21 similar to that of the first embodiment is formed on the bottom surface of the first concave portion 29.
A concave portion 12 that is in point contact with the concave portion 12 is formed. For this reason, the concave portion 12 of the holder body 3 is made to protrude and correspond. In the above configuration, since the position of the steel ball 21 approaches the polished surface of the lens 16, a straight line OP connecting the center O of the steel ball 21 and a point P on the outer peripheral edge of the polished surface of the lens 16 and the polished surface The angle formed by the tangent at point P, the so-called contact angle θ
Becomes smaller with respect to the polished surface. Therefore, the same effect as that of the first embodiment can be obtained, and the contact angle θ is reduced, so that the lens holding performance of the lens receiver with respect to the polishing resistance generated during the polishing is improved, and the processing surface precision is improved. , It is possible to stably produce higher quality lenses.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to the work holder for grinding | polishing by this invention, while being able to restrict the radial displacement of a lens within the minimum required range, the inclination of a lens, ie, the grinding plate (polishing grindstone) during grinding processing of a lens, is carried out. The displacement of the minute vibration caused by the displacement or rotation of the lens due to the polishing resistance can be absorbed with good followability within the above-mentioned restricted range.

As a result, the lens can be polished without generating flapping during processing, and a high-quality lens with excellent processing surface accuracy can be stably obtained.

Further, by bringing the position of the sphere closer to the surface to be processed of the lens, the contact angle in the polishing becomes small, and stable polishing can be performed.

Further, by fitting the O-ring to the sphere in the concave portion, even if the sphere moves in the concave portion due to grinding resistance or the like, the member can be easily returned to the axial center, and the followability can be improved. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a polishing work holder according to the present invention, FIG. 2 is a sectional view showing a second embodiment, and FIGS. 3 and 4 are modifications of the second embodiment. , FIG. 5 is a sectional view showing a third embodiment, FIG. 6 is a sectional view showing a fourth embodiment, and FIGS. 7 and 8 are explanatory views of the prior art. 1 ... polishing work holder 2 ... housing 3 ... holder body 8 ... V-ring 9 ... fastening ring 10,11,20 ... suction hole 12,19 ... recess 14 ... fixing ring 16 ... lens 17 Lens receiver 21 Steel ball 22, 23 O-ring 24 V-ring 29 First concave portion

Continuation of the front page (56) References JP-A-63-260751 (JP, A) JP-A-63-86987 (JP, U) JP-A-61-39350 (JP, U) JP-A-50-115893 (JP, U.S.A.) , U) JP-B-63-2739 (JP, B2)

Claims (3)

(57) [Claims] 1. A holder body rotatably supported by a housing and having a concave portion formed on one end surface on the rotation axis and a suction hole opened on the end surface, and a holder coaxially fixed to the holder body. A fixing ring that loosely fits the outer peripheral surface of the lens or the outer peripheral surface of the lens receiver such that the inner diameter of the portion restricts the movement of the lens in the radial direction, and a concave portion that is opposed to the concave portion of the holder body on one end surface. A lens receiver having a suction hole communicating with the suction hole so as to adsorb and support one of the lens surfaces of the lens at an end face; and a recess provided between the recess of the holder body and the recess of the lens receiver. A spherical body that is capable of tilting the lens receiver and moving in the radial direction in point contact with the bottom surface, and a sealing material disposed between the holder body and the lens receiver and outside the suction hole. Having Polishing a work holder which is characterized. 2. A sphere, which is provided between the concave portion of the holder body and the concave portion of the lens receiver and is in contact with the bottom surface of each concave portion, is disposed in a large-diameter concave portion formed on the axis of the lens receiver. The polishing work holder according to claim 1, wherein: 3. The sphere is contacted with a bottom surface of the sphere and an O-ring having elasticity is fitted into the sphere of the holder body or the sphere of the lens receiver. 2. The polishing work holder according to 2.