JPH10151556A - Holding tool for polishing optical material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of vibration of an optical element due to polishing resistance during polishing by providing a vibration absorbing body to absorb vibration of an optical material in linkage with some of an optical material or an optical support member or a drive means support member or through proper combination thereof. SOLUTION: A second lens surface S2 side reverse to a first lens surface S1 of a lens material L is inserted in the recessed part 11c for lens support of a lens support member 11 and held through an O-ring 17. Further, in a state that O-rings 14 and 15, a force receiving member 16, and a compression spring 13 are set, the shaft part 11b of the lens support member 11 is inserted in a recessed part 12a for containing a shaft part at the internal part of a hair pin-form support member 12. The upper end part 13b of the compression spring 13 is supported in a state to be fitted in a recessed part 12b for supporting a spring formed in the lower end surface of the hair pin-form support member 12A lens material L held at a lens holder 10 is placed on a rotating polishing disc 31 and braying movement by the hair pin-form member 32 and a drive mechanism is applied on the lens holder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to polishing of an optical material for holding an optical material when one of optically functional surfaces of an optical material such as optical glass is polished into a spherical shape to form an optical component. The present invention relates to a tool holder.

[0002]

2. Description of the Related Art Conventionally, when an optical component such as a lens is manufactured by processing an optical material, an optical material including an optical glass such as a crown-based glass, a flint-based glass, or the like, is subjected to material removal, lens surface processing, and lens processing. Processing is performed in the order of outer diameter processing.

[0003] The material removal processing is a step of roughly forming an optical material for one lens to obtain an optical material to be processed. The lens surface processing is performed in the order of rough processing, smoothing, and polishing (polishing).

[0004] Of the lens surface processing, the first rough processing is a step of improving the surface roughness by bringing the dimensions of the optical material from which the material has been removed close to the final value of the lens, and includes the steps of "roughing" and "curve generator". Grinding ". Subsequent smoothing processing is a step of making the surface roughness generated by the rough processing finer and adjusting the thickness dimension of the lens within the required accuracy, and is performed by "sanding" or "diamond smoothing". The final polishing is a step of finishing the lens surface into an optical mirror surface and adjusting its size and shape to within final accuracy, and is performed using a water-slurry abrasive or the like.

[0005] The lens outer diameter processing is called "centering",
After the above polishing process is completed, the optical material polished into a one-convex lens shape is mounted on a cylindrical grinder called "centering machine", and the center axis of the cylindrical grinding process in the centering machine and the optical axis of the lens This is a process for obtaining a lens having a predetermined diameter and an outer diameter by performing “centering” to make the center of the lens coincide with each other, and removing an unnecessary portion of the outer diameter portion of the centered lens with a grindstone or the like.

In the above-mentioned processing method, when an optical component is produced by polishing an optically functional surface of an optical material into a spherical shape,
For example, a method shown in FIG. 2 is known as a method for manufacturing a one-convex lens in which one surface is a convex spherical surface and the other surface is a flat surface by polishing. In FIG. 2, FIG. 2A shows the structure of a conventional lens polishing apparatus and a lens holder used for the apparatus.
The vicinity of the lens holder is a sectional view.

In this method, one lens material L, which has been subjected to rough processing such as roughing, is held by a lens holder 20, placed on a polishing dish 31 formed in a concave spherical shape, and then placed on the polishing dish 31. Is rotated, the first lens surface S1 of the optically functional surface of the lens material L is polished into a convex spherical shape with the surface to be polished, and "smoothing" and "polishing" are performed. The details of this method will be described below.

The lens holder 20 includes a substantially cylindrical lens holding screw receiving member 21 and a disk-shaped elastic sheet 22 made of an elastic material such as silicon rubber. At one end of the lens holding Kansashi receiving member 21, a shallow lens receiving concave portion 21a having a substantially cylindrical shape is formed, and the elastic sheet 22 is inserted and held in the lens receiving concave portion 21a. Next, in this state, the lens material L
Among them, the side of the second lens surface S2 opposite to the first lens surface S1 is inserted into the lens receiving recess 21a and is held via the elastic sheet 22.

The first lens surface S 1 of the lens material L is placed on a polishing surface 31 b which is the upper surface of the polishing plate 31. The polishing surface 31b is formed in a concave spherical shape, and an abrasive (not shown) is disposed on the surface. Polishing dish 31 is rotating shaft 3
1a. A rotary drive source (not shown) such as an electric motor is attached to the rotary shaft 31a, and the rotary drive source is configured to be started or stopped by a first control mechanism (not shown). Have been. With such a configuration, the polishing dish 31 is driven to rotate around the center line A1 or stopped under the control of the first control mechanism.

At the center of the other end of the lens holding wrench receiving member 21, a substantially hemispherical wrench receiving recess 21b is formed. The substantially spherical tip portion 32b of the kansashi 32, which is an elongated substantially columnar member, is inserted and held in the kansashi receiving recess 21b. As a result, the first lens surface S1 of the lens material L comes into close contact with the polished surface 31b.
In this case, the tip portion 32b of the kansashi 32 freely slides in the kanseki receiving concave portion 21a, thereby enabling universal joint-like three-dimensional movement.

On the other hand, the other end of the shaft portion 32a of the kansashi 32 is fixed to a mounting portion 33b of a substantially disk-shaped rotating body 33. At this time, an extension of the center line A2 of the shaft portion 32a of the kansashi 32 passes through the center of curvature O of the convex spherical surface of the first lens surface S1, and has an angle α with respect to the rotation center line A3 of the rotating body 33.
(Hereinafter, referred to as “inclination angle”).

The rotating body 33 has a rotating shaft 33a.
The rotating shaft 33 a is supported by a bearing 34. A belt wheel 35 is attached to the rotating shaft 33a. A belt 36 is wound around the belt wheel 35. On the other hand, a belt wheel 37 is attached to a drive shaft 38a of a rotary drive source 38 composed of an electric motor or the like, and a belt 36 is wound around the belt wheel 37. The rotation drive source 38 is configured to be started or stopped by a second control mechanism (not shown).

The above-mentioned rotating body 33 and belt wheels 35, 3
7, a belt 36, and a rotation drive source 38
Is composed.

When the first control mechanism (not shown) is controlled by the above configuration, the polishing plate 31 is driven to rotate around the center line A1. Next, when the rotation drive source 38 is started by the second control mechanism (not shown), the rotating body 3
3 is driven to rotate about the rotation center line A3. The movement of the rotating body 33 causes the screw 32 to rotate around the center line A3, and accordingly, the lens holding screw receiving member 21 is driven, and the lens material L slides on the polishing surface 31b.

As described above, the kansashi 32 is attached at an inclination angle α to the rotation center line A 3 of the rotating body 33, and the center line A 2 of the kansashi 32 is a convex spherical surface of the lens material L. It passes through the center of curvature O of the first lens surface S1. The center point of curvature of the polished surface 31b is a point O. For this reason, the lens holding kansashi receiving member 21 performs a so-called “sliding motion”. In this case, the center line A3 becomes the motion axis of the squirting motion, and the point O becomes the fixed point of the squirting motion. By such movement of the lens holder 20,
The first lens surface S1 of the lens material L is the rotating polishing surface 3
1b, the first lens surface S1 is polished into a highly accurate convex spherical surface.

For example, as shown in the sectional view of FIG. 2B, the radius of curvature of the first lens surface S1 (between the center of curvature O of the first lens surface S1 and the point P 'on the first lens surface S1) Is R. Also, the center point of the second lens surface S2 is Q
Assuming that the center point of the first lens surface S1 is P, the distance between PQ is the center thickness d of the lens material L. Further, let D be the outer diameter of the lens material L.

[0017]

However, in the conventional lens polishing method described above, if the curvature radius R of the lens material L is large, the center thickness d is large, and the outer diameter D is small, the lens material L is not polished during polishing. In some cases, vibration called "chatter" or "flapping" caused by polishing resistance with the polishing plate 31 was generated. If polishing is continued against this vibration, there is a problem that the spherical accuracy of the first lens surface S1, which is the surface to be polished, is reduced. Further, when the vibration is severe, the lens material L comes off from the lens holder 20, and the lens material L has to be set again in the polishing apparatus, which is troublesome and troublesome, and reduces the production efficiency and the polishing. There is also a problem that the tool may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a holder for polishing an optical material capable of preventing vibration of the optical material due to a polishing resistance during polishing. Is to provide.

[0019]

In order to solve the above-mentioned problems, a holder for polishing an optical material according to the present invention, when polishing the surface to be polished of the optical material by a rotating polishing surface, removes the optical material. An optical material polishing holder for holding,
An optical material receiving member for holding the optical material from a surface direction of the optical material opposite to the surface to be polished, and an optical material holding member configured to be interlocked therewith; the surface to be polished is in close contact with the polishing surface; A driving means receiving member engageable with a driving means for driving so as to slide while moving, and interlocked with the optical material or any one of the optical material receiving member or the driving means receiving member or an appropriate combination thereof. A vibration absorber that absorbs vibration of the optical material by elastic deformation.

In the holder for polishing an optical material described above, preferably, the vibration absorber is elastically deformed in a close direction in which the driving means makes the surface to be polished close to the polishing surface. It is configured to absorb the close-direction vibration generated in the optical material.

Further, in the above-mentioned holder for polishing an optical material, preferably, the driving means receiving member is configured to be movable in the close contact direction with respect to the optical material receiving member.

In the above-mentioned holder for polishing an optical material, preferably, the driving means receiving member is capable of interlocking with the optical material receiving member in a driving direction which is a direction perpendicular to the close direction. The vibration absorber is configured to elastically deform along the driving direction and to absorb the vibration in the driving direction generated in the optical material during the polishing.

In the holder for polishing an optical material, the vibration absorber is preferably a compression spring interposed between the optical material receiving member and the driving means receiving member.

In the holder for polishing an optical material, the vibration absorber is preferably an annular elastic member interposed between the optical material receiving member and the driving means receiving member.

In the holder for polishing an optical material, preferably, the vibration absorber is an annular elastic member interposed between the held surface of the optical material and the optical material receiving member. is there.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a lens holder which is an embodiment of a lens polishing holder according to the present invention. As shown in the figure,
The lens holder 10 includes a lens receiving member 11, a screw receiving member 12, a compression spring 13, and a force receiving member 16.
And O-rings 14, 15, 17.

The lens receiving member 11 is made of a material such as metal and has a large-diameter disk-shaped large-diameter portion 11a and a small-diameter cylindrical shaft portion 11b connected to the large-diameter portion 11a. On the end face of the large diameter portion 11a opposite to the shaft portion 11b, a shallow lens receiving concave portion 11c having a substantially cylindrical shape is formed. A substantially annular O-ring accommodating recess 1 for accommodating an O-ring 17 described later is provided near the outer periphery of the lens receiving recess 11c.
1d is formed. Also, the shaft portion 11 of the large diameter portion 11a
A substantially annular O-ring accommodating recess 11e for accommodating an O-ring 14, which will be described later, is formed on the end surface on the b side. A substantially annular O-ring accommodating recess 11f for accommodating an O-ring 15 to be described later is formed on an outer surface of a portion of the shaft portion 11b near the large-diameter portion 11a.

The O-ring 17 is an annular member made of an elastic material such as silicone rubber and has a circular cross section. The diameter of the ring of the O-ring 17 is
The diameter of the O-ring accommodating concave portion 11d formed in the lens receiving concave portion 11c is substantially the same as that of the O-ring accommodating concave portion 11d, and the O-ring 17 is held by being inserted into the O-ring accommodating concave portion 11d. In this state, of the lens material L, the first
The side of the second lens surface S2 opposite to the lens surface S1 is inserted into the lens receiving recess 11c of the lens receiving member 11, and
It is held via a ring 17.

The O-ring 14 is a member formed by forming an elastic material such as silicone rubber into an annular shape, and has a circular cross section. The diameter of the ring of the O-ring 14 is equal to the diameter of the lens receiving recess 11c in the large diameter portion 11a of the lens receiving member 11.
O-ring accommodating recess 1 formed on the end face opposite to
The diameter is almost the same as the diameter of 1e, and the O-ring 14 is held by being inserted into the O-ring accommodating recess 11e.

The O-ring 15 is a member formed by forming an elastic material such as silicon rubber into an annular shape, and has a circular cross section. The diameter of the ring of the O-ring 15 is substantially the same as the diameter of the O-ring housing recess 11f formed on the outer surface of the shaft portion 11b of the lens receiving member 11, and the O-ring 15 is It is held by inserting it into the concave portion 11f.

The force receiving member 16 is made of a material such as metal.
It has a substantially cylindrical portion 16a and a flange portion 16b that protrudes in a flange shape from the lower end of the cylindrical portion 16a. This cylindrical part 16
The inner diameter of “a” is larger than the outer diameter of the shaft portion 11 b of the lens receiving member 11 and has substantially the same value as the outer diameter of the O-ring 15.

With such a configuration, with the O-rings 14 and 15 set in the O-ring receiving recesses 11e and 11f of the lens receiving member 11 as described above, the inside of the cylindrical portion 16a of the force receiving member 16 is formed. Lens receiving member 1 in cavity
When the first shaft portion 11b is inserted, the flange portion 1
6b is supported by an O-ring 14, and the force receiving member 1
The inner wall surface of the cylindrical portion 16 a is supported by the O-ring 15.

The compression spring 13 is a coil spring formed in a substantially cylindrical shape by spirally winding a steel wire having a circular cross section. The inner diameter of the cylindrical portion of the compression spring 13 is larger than the outer diameter of the shaft portion 11b of the lens receiving member 11, slightly larger than the outer diameter of the cylindrical portion 16a of the force receiving member 16, and The value is almost the same as the outer diameter of the side wall of the spring receiving recess 12b. The compression spring 13 has a lower end 13a and an upper end 13b.
When a compressive force acts between them, they are elastically deformed so as to contract in the compression direction, and when the compressive force is released, they are elastically deformed so as to extend in the direction opposite to the compression direction and restored.

With such a configuration, with the O-rings 14, 15 and the force receiving member 16 set as described above, the lens receiving member 11 is inserted into the cavity inside the compression spring 13.
The lower end 13 of the compression spring 13 is
“a” is supported on an end surface of the flange 16 b of the force receiving member 16 opposite to the end surface supported by the O-ring 14.

The kansashi receiving member 12 is made of a material such as metal and is a substantially cylindrical member having one end closed, and has an inner diameter larger than the outer diameter of the shaft portion 11b of the lens receiving member 11. A shaft accommodation recess 12a, which is a substantially cylindrical recess, is formed. In addition, the kansashi receiving member 12
A spring receiving concave portion 12b which is a substantially annular concave portion having a substantially “L” cross section capable of accommodating the upper end 13b of the compression spring 13 is formed on an end face on the opening side of the compression spring 13. This spring receiving recess 12
The outer diameter of the upright side wall portion of b is substantially the same as the inner diameter of the cylindrical portion of the compression spring 13.

A substantially spherical tip portion 32b of the kansashi 32 is provided on the outer end surface of the kansashi receiving member 12 on the closed side.
A semi-spherical wrench receiving recess 12 that can be inserted and slid
c is formed. The tip 32b of the kansashi 32
It freely slides in the kansashi receiving recess 12c to enable universal joint-like three-dimensional movement. Further, an air vent hole 12 for communicating the vicinity of the bottom of the shaft portion accommodating recess 12a with the outside is provided in a side portion of the kansashi receiving member 12.
d is formed.

With such a configuration, with the O-rings 14 and 15, the force receiving member 16 and the compression spring 13 set as described above, the lens receiving portion 12 a in the shaft receiving portion 12 a inside the screw receiving member 12. When the shaft portion 11 b of the member 11 is inserted, the upper end 13 b of the compression spring 13 becomes a spring receiving recess 12 b formed on the lower end surface of the kansashi receiving member 12.
It fits inside and is supported.

In this state, the shaft portion 11b of the lens receiving member 11 is fitted into the shaft receiving recess 12a inside the screw receiving member 12, and the direction of the center line A2 of the screw 32, that is, the screw 32 is fixed to the lens holder 10a. Are slidable with each other along a direction in which the lens material L is brought into close contact with the polishing plate 31 (hereinafter, referred to as a "close direction"). Therefore, the Kansashi receiving member 12 is configured to be movable in the close contact direction with respect to the lens receiving member 11.

On the other hand, in this state, the Kansashi receiving member 1
The lens receiving member 11 is provided in the shaft accommodation recess 12a inside
Are fitted together, and can be interlocked with each other in a direction perpendicular to the close contact direction, that is, in a direction in which the kansashi 32 is driven by “sliding motion” (hereinafter, referred to as “driving direction”). I have. Therefore, the kansashi receiving member 12
Is configured to be interlocked with the lens receiving member 11 along the driving direction.

The lens material L held in the lens holder 10 as described above is placed on a rotating polishing plate 31 shown in FIG. 2A, and a kanshi 32 shown in FIG. When the "moving motion" by the drive mechanism 40 is applied to the lens holder 10, the first lens surface S1 of the lens material L is slid while being in close contact with the rotating polishing surface 31b, and the first lens surface S1 is raised. Polished to a convex spherical shape with high accuracy.

In this case, the lens holder 1 of the present embodiment
In the case of 0, even if the radius of curvature R of the lens material L is large, the center thickness d is large, and the outer diameter D is small, vibration called "chatter" or "flapping" as in the conventional case is generated during polishing. Does not occur.

This is because, in the conventional lens holder 20 shown in FIG.
Are arranged, but the tolerance of elastic deformation is insufficient to absorb the above-described vibration. On the other hand, in the lens holder 10 of the present embodiment, the compression spring 13 and the O-rings 14 and 15 are provided. , 17 are arranged, the tolerance of elastic deformation when holding the lens material L is increased, and the vibration of the lens material L is absorbed.

More specifically, the compression spring 13 is interposed between the lens receiving member 11 and the kanseki receiving member 12, and allows a considerable elastic deformation along the close contact direction.
Therefore, the compression spring 13 is effective in absorbing the vibration in the close direction among the vibrations generated in the lens material L.

When the compression spring 13 is elastically deformed in the contracting direction, the shaft 11b of the lens receiving member 11 enters the shaft receiving recess 12a inside the kansashi receiving member 12, and
Attempts to compress the air inside. In this case, if there is no air vent hole, the air inside becomes a kind of air spring and the shaft 1
1b, and acts in a direction to prevent elastic deformation of the compression spring 13. However, the air in the shaft housing recess 12a is discharged to the outside through the air vent hole 12d, and the compression spring 13 can be elastically deformed without resistance.

The O-ring 14 supports the compression spring 13 on the lens receiving member 11 via the force receiving member 16 and, among the vibrations generated in the lens material L by being elastically deformed in the close contact direction. It is effective for absorbing vibration in the close direction.

Similarly, the O-ring 17 is interposed between the lens material L and the lens receiving member 11, supports the lens material L on the lens receiving member 11, and elastically deforms in the close direction. Of the vibrations generated in the lens material L, it is effective in absorbing the vibration in the close direction.

Further, the O-ring 15 supports the compression spring 13 on the lens receiving member 11 via the force receiving member 16,
The elastic deformation along the driving direction is effective in absorbing the vibration in the driving direction among the vibrations generated in the lens material L.

With the above-described operation, in the lens holder 10 of the present embodiment, even when the radius of curvature R of the lens material L is large, the center thickness d is large, and the outer diameter D is small, polishing is performed during polishing. Since the vibration called "chatter" or "flutter" unlike the conventional case does not occur, the spherical accuracy of the first lens surface S1, which is the surface to be polished, does not decrease. Further, since the lens material L does not come off from the lens holder 10, the lens polishing can be stably performed, and the manufacturing efficiency is improved. Also,
The breakage of the polishing tool can be prevented.

In the above embodiment, the lens holder 10 corresponds to a holder for polishing an optical material. Also,
The lens material L corresponds to an optical material. The first lens surface S1 to be polished into a spherical shape corresponds to the surface to be polished, and the second lens surface S2 on the opposite side corresponds to the surface to be held. The first lens surface S1 and the second lens surface S2 correspond to optically functional surfaces. Further, the lens receiving member 11 corresponds to an optical material receiving member, and the kanseki receiving member 12 corresponds to a driving means receiving member. Kansashi 32 and drive mechanism 4
0 corresponds to the driving means. The compression spring 13 and the O-rings 14, 15, 17 correspond to a vibration absorber. The O-rings 14, 15, 17 correspond to annular elastic members.

The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

For example, in the above embodiment, a description has been given of an example in which the optical material (L) held by the optical material holder is a one-convex lens material, but the present invention is not limited to this. Instead, it is only necessary that one of the two lens surfaces serving as the optically functional surfaces is polished at least into a spherical shape, and a lens having another shape, for example, a one-concave lens, a biconvex lens, or a biconcave lens may be used. Further, the surface of these lenses on the side opposite to the spherical surface may be an aspheric surface instead of a flat surface. Further, the optical material may be not only a lens but also a mirror or a prism. In the case of a mirror, the reflection surface becomes an optically functional surface. In the case of a prism, the entrance surface and the exit surface are optically functional surfaces.

Further, in the above embodiment, the example in which the optical material receiving member (11) and the driving means receiving member (12) are formed of a metal material has been described. However, the present invention is not limited to this. Any material may be used as long as it has strength, and it may be formed of another material, for example, a ceramic material such as nitride or carbide, engineering plastics, or the like.

In the above embodiment, an example was described in which the optical material receiving member (11) was formed in a substantially cylindrical shape and the driving means receiving member (12) was formed in a substantially cylindrical shape. The configuration is not limited thereto, and any configuration may be used as long as the configuration is such that the drive means receiving member (12) is movable along the close direction and is interlocked along the drive direction. For example, the optical material receiving member (11) may be formed in a substantially cylindrical shape, and the driving means receiving member (12) may be formed in a substantially cylindrical shape capable of fitting and sliding thereon.

In the above embodiment, the compression spring 13 and the force receiving member 16 are provided between the optical material receiving member (11) and the driving means receiving member (12), and the force receiving member 16 and the optical material receiving member are provided. (11) and an annular elastic member (14,
15), the present invention is not limited to this, and the annular elastic members (14, 1) are arranged.
5) may be arranged at any position as long as it is interposed between the optical material receiving member (11) and the driving means receiving member (12), and may have another configuration such as an optical material receiving member ( 1
1) and the compression spring 13 between the driving means receiving member (12).
And the force receiving member 16 is not provided, and the distal end of the drive means receiving member (12) is formed in the same shape as the force receiving member, and between the distal end of the drive means receiving member (12) and the optical material receiving member (11). An annular elastic member (14, 15) may be arranged on the second member.

In the above embodiment, the compression spring (13) of the vibration absorber is made of steel, and the O-rings (14, 15, 17), which are annular elastic members, are made of silicon rubber. Although described, the present invention is not limited to this, may be any material as long as it has the required elasticity, other materials, for example,
The compression spring may be formed of a ceramic material such as nitride or carbide, engineering plastics, or the like, and the O-ring may be formed of natural rubber, synthetic rubber, plastics, or the like.

In the above embodiment, the compression spring (13) or the O-ring (14, 15, 1), which is a vibration absorber, is used.
Although an example in which the cross section of 7) is a circular cross section has been described, the present invention is not limited to this, and another cross section, for example, a square cross section may be used. Also, the form of the compression spring is not limited to the above-described embodiment, and may be a leaf spring, a bamboo spring, or the like, in addition to the coil spring. Also,
An air spring is formed using the shaft housing recess 12a and the like,
This may be used as a compression spring.

In the above embodiment, the compression spring (13), which is a vibration absorber, is connected to the optical material receiving member (11).
In the case where the compression spring is directly supported by the drive means receiving member (12), the annular elastic members (14, 15) are interposed in the close contact direction and the drive direction, respectively. The present invention is not limited to this, and the direction in which the compression spring is supported by the driving means receiving member (12) (for example, between the upper end 13b of the compression spring 13 and the spring receiving concave portion 12b of the kansetsu receiving member 12) is also in a close contact direction. You may comprise so that an annular elastic member may be interposed in a drive direction, respectively.

Further, in the above embodiment, the compression spring (13) and the annular elastic members (14, 15) are arranged in the direction of close contact between the optical material receiving member (11) and the driving means receiving member (12) and the driving direction. Although an example in which an annular elastic member (17) is interposed in the close direction between the optical material (L) and the optical material receiving member (11) has been described, the present invention is not limited to this. However, other configurations, for example, the compression spring (13) and the annular elastic members (14, 15, 1) among the vibration absorbers
Only one of 7) may be used independently in the close direction or the drive direction, or these may be used in an appropriate combination. The above embodiment is the most suitable example, because the vibration absorbers have a certain effect in preventing vibration even when used independently. In addition, the compression spring can be used as a vibration absorber in the driving direction by arranging the compression spring radially with respect to the center line in the close direction.

[0059]

As described above, according to the method of polishing an optical material according to the present invention, the holder for polishing an optical material, which is held when the surface to be polished of the optical material is polished into a spherical shape, has an optical material or Either the optical material receiving member or the driving means receiving member or an appropriate combination thereof is provided with a vibration absorber that elastically deforms, so that vibration of the optical material due to polishing resistance during polishing can be absorbed and prevented. it can. In addition, it is possible to prevent a decrease in spherical accuracy of the surface to be polished. Furthermore, since the optical material does not come off from the holder for polishing the optical material, the polishing of the optical material can be stably performed, the production efficiency is improved, and the polishing tool can be prevented from being damaged. There is.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a lens holder according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams illustrating a conventional lens polishing method. FIG. 2A is a conceptual diagram showing a configuration of a conventional lens polishing apparatus and a lens holder used therein, and FIG. Sectional views showing the relationship between the shape and dimensions are shown.

[Explanation of symbols]

 Reference Signs List 10 Lens holder 11 Lens receiving member 11a Large diameter portion 11b Shaft portion 11c Lens receiving concave portion 11d, 11e, 11f O-ring accommodating concave portion 12 Kankashi receiving member 12a Shaft accommodating concave portion 12b Spring receiving concave portion 12c Kankashi receiving concave portion 12d Air vent hole 13 Compression spring 13a Lower end 13b Upper end 14,15 O-ring 16 Force receiving member 16a Cylindrical portion 16b Flange 17 O-ring 20 Lens holder 21 Lens holding kanshi receiving member 21a Lens receiving concave portion 21b Kanji receiving concave portion 22 Elastic sheet 31 Polishing dish 31a Rotating shaft 31b Polishing surface 32 Kansashi 32a Shaft portion 32b Tip portion 33 Rotating body 33a Rotating shaft 33b Mounting portion 34 Bearing 35 Belt wheel 36 Belt 37 Belt wheel 38 Rotary drive source 38a Drive shaft 40 Drive mechanism A1 to A 3 Center line L Lens material D Outer diameter of lens material d Center thickness of lens material O Center of curvature of first lens surface P Center point of first lens surface P 'Point on first lens surface Q Center of second lens surface Point R Radius of curvature of first lens surface S1 First lens surface (surface to be polished) S2 Second lens surface α Tilt angle

Claims (7)

[Claims] An optical material holder for holding an optical material when the surface to be polished of the optical material is polished by a rotating polishing surface, wherein the holder is opposite to the surface to be polished of the optical material. An optical material receiving member that holds the optical material from the side surface direction, and a driving unit that is configured to be able to interlock with the optical material holding member and that drives the surface to be polished to slide while being in close contact with the polishing surface. A driving means receiving member capable of engaging with the optical material, or interlocking with any one of the optical material or the optical material receiving member or the driving means receiving member or an appropriate combination thereof, and absorbing vibration of the optical material by elastic deformation. A holder for polishing an optical material, comprising: 2. The holder for polishing an optical material according to claim 1, wherein the vibration absorber elastically deforms along a close direction in which the driving means makes the polished surface come into close contact with the polished surface. A holder for polishing an optical material, wherein the holder for polishing the optical material is configured to absorb the vibration in the close direction that sometimes occurs in the optical material. 3. The holder for polishing an optical material according to claim 2, wherein the driving means receiving member is configured to be movable in the close contact direction with respect to the optical material receiving member. Holder for material polishing. 4. The holder for polishing an optical material according to claim 1, wherein the driving means receiving member is capable of interlocking with the optical material receiving member in a driving direction which is a direction perpendicular to the close direction. Wherein the vibration absorber is elastically deformed along the driving direction, and is configured to absorb vibration in the driving direction generated in the optical material during the polishing. Holder. 5. The holder for polishing an optical material according to claim 3, wherein the vibration absorber is a compression spring interposed between the optical material receiving member and the driving means receiving member. Optical material polishing holder. 6. The holder for polishing an optical material according to claim 3 or 4, wherein the vibration absorber is an annular elastic member interposed between the optical material receiving member and the driving unit receiving member. A holder for polishing an optical material, which is a member. 7. The holder for polishing an optical material according to claim 2, wherein the vibration absorber is an annular elastic member interposed between the held surface of the optical material and the optical material receiving member. A holder for polishing an optical material, comprising: