JPH07164298A - Lens holding device - Google Patents

Abstract

PURPOSE:To provide a lens holding device in which a lens can be efficiently attached and detached, the device can be applied also to a work performed while controlling the rotating speeds of the lens and a tool, and the lens can be precisely worked in a short time. CONSTITUTION:A holding body 2 has a reversed cup-like recessed part for holding a lens 1 on the lower end. The lower surface of the holding body 2 is formed substantially equal to the curvature radius of the reverse surface of the lens 1. A receiving part 3 consisting of an elastic material is fixed to the lower end recessed part of the holding body 2. A plurality of suction cups 3a are formed on the receiving part 3. The reverse surface of the lens 1 to be worked is pressed onto the receiving part 3 of the holding body 2 recessed part. The suction cups 3a of the receiving part 3 are closely adhered to the reverse surface of the lens 1, and the lens 1 is fixed to and held by the holding body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holding device for holding a lens when grinding or polishing the lens.

[0002]

2. Description of the Related Art Conventional lens holding devices include those disclosed in Japanese Utility Model Publication No. 54-15351 and Japanese Patent Application Laid-Open No. 60-71158. First, the polishing lens holding device described in Japanese Utility Model Publication No. 54-15351 will be described with reference to FIGS. 6 and 7. This holding device includes a polishing plate 120 having a drive shaft 121 and a lens holding device 101.
The polishing lens 119 is pressed through the center of the lens holding device 101 and the center 122 causes the lens holding device 101 to traverse left and right in the figure. The lens holding device 101 has a front surface portion 103 having the same curvature as a finished outer peripheral surface (abrasive surface, which is the surface opposite to the processing surface) 119a of the polishing lens 119, and is provided on a backing plate 102 made of a metal material. A rubber thin plate 105 is attached to form a positioning surface 106.

A receiving member 107 for the center 122 is embedded in the center of the back surface 104 of the backing plate 102. Further, a holding member 108 made of synthetic resin such as Bakelite is fixed to the backing plate 102 with screws 112. The gripping member 108 has a cylindrical shape, and a protrusion 110 protruding outward is provided at the tip of the cylindrical portion 109, and a large number of split grooves 11 are provided in the axial direction.
A large number of grip claws 109a are formed by engraving 1. The grip claws 109a are adapted to hang on the edge portion 119c of the polishing lens 119. Further, a thumbscrew 117 is screwed into the female screw 118 drilled in the backing plate 102 so as to penetrate the holding member 108, and the frame 113 made of aluminum or the like is attached to the projection 110 of the holding member 108.
It is configured to be able to abut.

According to the apparatus having the above structure, the polishing lens 11
With 9 attached to the thin rubber plate 105, the thumbscrew 1
When turning 17, the gripping member 108 and the frame body 113 are tightened, and the tip end engaging portion 114a of the frame body 113 is fixed to the gripping member 1.
The protrusion 110 of No. 08 is abutted. Thereby, the grip claw 10
The tip of 9a is bent inward, and the edge 119c of the polishing lens 119 is pressed and held by the grip claw 109a.

Next, the device disclosed in Japanese Patent Laid-Open No. 60-71158 will be described with reference to FIG. The chamber 139 of the lens holder device 136 for the optical lens 131 to be faced
Is applied to the working surface 134 of the chamfering tool 130 to supply the pressurized hydraulic fluid to the chamber 139. Thus,
A hydraulic cushion 135 is formed between the optical lens 131 and the end wall 137 of the chamber 139 and acts on the facing surface 133 of the optical lens 131. At the same time, a hydraulic film is formed around the optical lens 131 between the peripheral edge 144 of the optical lens 131 and the side wall 142 of the chamber 139. In this way, the optical lens 131 to be chamfered is not in direct contact with the lens holder device 136, so that the optical lens 131 can rotate about its own axis.

[0006]

However, the conventional lens holding device has the following drawbacks. In the polishing lens holding device described in Japanese Utility Model Publication No. 54-15351, when processing the polishing lens 119, it is necessary to manually tighten the thumbscrew 117 for each lens to be processed. Therefore, it is necessary to perform this work every time one polishing lens 119 is processed, and the workability is poor. Further, in processing performed while controlling the number of rotations of the polishing lens 119 and the tool (polishing disk 120), the polishing lens 119 and the tool do not rotate in the lens holding device 101 because the processing resistance of the tool increases. In order to do so, it is necessary to hold the outer circumference of the lens with a larger force. In that case, in the case of a thin lens, the lens is particularly deformed, so that it cannot be processed with high precision.

On the other hand, in the lens holder device 136 described in Japanese Patent Application Laid-Open No. 30-71158, the back surface of the optical lens 131 is supported by a fluid, and the side surface of the optical lens 131 is supported by a hydraulic film. Therefore, even if processing is performed while controlling the rotation speeds of the optical lens 131 and the tool 130, the optical lens 131 rotates in the lens holder device 136, and the desired rotation speed cannot be given to the optical lens 131. It was

The present invention has been made in view of the above-mentioned problems of the prior art, and the lens can be efficiently attached and detached, and it can be applied to processing performed while controlling the rotational speeds of the lens and the tool. An object is to provide a lens holding device that can be processed in a short time.

[0009]

In order to solve the above problems, the present invention relates to a lens holding device used for lens grinding and polishing, wherein a lower end of a shaft portion has an inverted cup shape. The inverted cup-shaped portion has a receiving portion fixed to the lower surface and having a plurality of suction cups formed on the surface.

FIG. 1 is a conceptual view of the main part of the lens holding device of the present invention. Reference numeral 2 is a holding body having an inverted cup-shaped recess for holding the lens 1 at the lower end. The lower surface of the holding body 2 is
The radius of curvature of the back surface of the lens 1 is formed to be substantially the same. Further, a receiving portion 3 made of an elastic material is fixed to the lower end concave portion of the holding body 2. The receiving portion 3 is formed with a plurality of suction cups 3a.

[0011]

In the lens holding device shown in FIG. 1, the back surface of the lens 1 to be processed is pressed against the receiving portion 3 of the concave portion of the holding body 2. Then, the suction cup 3a of the receiving portion 3 comes into close contact with the back surface of the lens 1,
The lens 1 is fixed and held by the holder 2.

[0012]

Embodiment 1 FIGS. 2, 3 and 4 show a front view, a side view and a perspective view of a lens holding device of this embodiment, respectively. Reference numeral 11 is an upper shaft of a polishing shaft which has a pressurizing mechanism (not shown) and can be moved up and down. A mounting tool 13 is mounted on the upper shaft 11 with a screw 12, and a staying tool is provided through the mounting tool 13. 14 is fixed. Also, stay 14
At the lower end portion of the bearing 16, a U-shaped first swing member 15 is provided with a bearing 16 so that the first swing member 15 can swing A about its center axis.
It is supported by the support shaft 17 via. The spindle 17 is
The stay 18 is attached to the stay 14 by being screwed into a receiver 18 fitted in the stay 14 and tightened by a nut 19 from the opposite side of the first swing member 15 to the stay 14.

Both ends of the second swinging member 20 having a U-shape are attached to both ends of the first swinging member 15 by a support shaft 21, and the second swinging member 20 swings the support shaft 21. It is possible to swing B as a center of motion. The axes of the support shafts 17 and 21 are configured to intersect at a point O, and the first swing member 15 and the second swing member 20 swing A and B around the point O, respectively. ing. Second swing member 2
At the center of 0, a holder 2 that holds the lens 1 to be polished at the lower end is rotatably mounted via a bearing 24 so that its axis intersects at point O. A recess is formed at the lower end of the holding body 2 and a rubber receiving portion 3 is fixed thereto. The lower surface of the holder 2 is formed so as to have a radius of curvature substantially equal to that of the back surface of the lens 1.
On the other hand, a large number of suction cups 3a are formed on the lower surface of the receiving portion 3.

A pulley shaft 30 is screwed to the attachment 13 to connect the pulley shaft 30 and the upper shaft 11. A seal 31 is mounted between the fixture 13 and the pulley shaft 30. A pulley 33 is rotatably attached to the pulley shaft 30 via a bearing 32, and a seal 34 is provided between the two.
Is installed. The lower end of the pulley 33 and the holder 2
The upper end of the pulley 33 is connected by a joint 35 having flexibility and airtightness to a fluid so that the rotation of the pulley 33 can be transmitted to the holding body 2. Pulley 33
Is connected to a motor 38 via a belt 36 and a pulley 37, and by rotating the motor 38, the lens 1 can be rotated together with the holding body 2. The pulley 37 on the motor 38 side is formed to be wide in the axial direction, and the belt 36 can be moved in the vertical direction with the vertical movement of the upper shaft 11, that is, the vertical movement of the pulley 33.

When processing the lens 1 according to this embodiment, first, the back surface of the lens 1 is sucked by the suction cup 3 of the receiving portion 3 of the holder 2.
Press on a and fix. Next, lower the upper shaft 11,
The processed surface of the lens 1 is brought into contact with the polishing tool 29. Then, a machining liquid is supplied (not shown), and the motor 38 rotates the lens 1 via the pulley 37, the belt 36, the pulley 33, the joint 35, and the holding body 2 while rotating the polishing tool 29 (polishing). A motor for rotating the tool 29 gives a swinging motion (not shown) to start the processing of the lens 1. At this time, the rotation numbers of the lens 1 and the polishing tool 29 were set to 250 rpm and 1600 rpm, respectively.

When the processing is finished, the upper shaft 11 is raised to separate the lens 1 from the polishing tool 29. At the same time, the rotation of the holder 2, the rotation and swing of the polishing tool 29, and the supply of the working liquid are stopped. After that, the lens 1 is taken out from the holder 2.

According to the above-described embodiment, the lens 1 can be efficiently attached and detached, the lens 1 can be prevented from slipping in the holding body 2, and the rotation speed of the lens 1 can be controlled by the rotation speed of the holding body 2. Therefore, it can be applied to processing performed while controlling the number of rotations of the lens 1 and the polishing tool 29. Therefore, since the rubbing speed of the lens 1 and the polishing tool 29 can be set so that the polishing speed becomes the highest, the lens 1 can be processed with high accuracy and in a short time.

[0018]

[Embodiment 2] FIG. 5 is a vertical cross-sectional view of the lens holding device according to the present embodiment. The difference from the first embodiment is that a hollow hole and a vent hole are provided in the holding body 2 and the receiving portion 3, respectively, so that vacuum suction can be performed. Therefore, in FIG. 5, only main parts are shown, the same members are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the holder 2 is provided with the hollow hole 2a and the communication hole 2b. Further, the suction hole 3a of the receiving portion 3 is provided with the ventilation hole 3b so as to communicate with the communication hole 2b. On the other hand, although not shown in FIG. 5, the pulley shaft 30, the pulley 33, and the joint 35 shown in FIG. 2 are hollow. Therefore, a pneumatic device (not shown) communicates with the upper shaft 11 so that air can be sucked and discharged from the tip of the suction cup 3a of the receiving portion 3.

According to this embodiment, when processing the lens 1, the back surface of the lens 1 is sucked by the suction cup 3 of the receiving portion 3 of the holder 2.
Contact a. Next, the lens 1 is fixed to the holder 2 by suction with a pneumatic device (not shown). After that, the upper shaft 11
Is lowered to bring the processed surface of the lens 1 into contact with the polishing tool 29. After that, a working liquid is supplied (not shown), and the motor 38 rotates the lens 1 via the pulley 37, the belt 36, the pulley 33, the joint 35, and the holding body 2, and swings while rotating the polishing tool 29. A motion (not shown) is given to start processing of the lens 1. When finishing the processing, the upper shaft 11 is raised and the lens 1 is moved to the polishing tool 2
Move away from 9. At the same time, rotation of the holder 2 and polishing tool 2
The rotation and rocking of 9 and the supply of machining liquid are stopped. After that, air is discharged by a pneumatic device, and the lens 1 is held by the holder 2
Take out from.

According to the present embodiment described above, the same effects as in Embodiment 1 are obtained, and since air suction and discharge can be performed, the lens 1 can be attached and detached more efficiently.

[0021]

As described above, according to the lens holding device of the present invention, the lower end of the shaft portion has an inverted cup shape, and the lower surface of the inverted cup-shaped portion is fixed to the holding body and a plurality of surfaces are provided on the surface. Since the lens holding device is configured with the receiving part formed with the suction cup of, the lens can be attached and detached efficiently, and it can be applied to the processing performed while controlling the rotation speed of the lens and the tool.
The lens can be processed with high accuracy and in a short time.

[Brief description of drawings]

FIG. 1 conceptually shows a lens holding device of the present invention (a).
FIG. 6 is a front view of a vertical section of a half section, (b) a bottom view, and (c) a front view of a vertical section of the section which holds a lens.

FIG. 2 is a half-vertical longitudinal sectional front view showing the lens holding device of Embodiment 1 of the present invention.

FIG. 3 is a side view showing the lens holding device of the first embodiment.

FIG. 4 is a perspective view showing the lens holding device of the first embodiment.

FIG. 5 is a half-vertical longitudinal sectional view showing a main part of a lens holding device according to a second embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a conventional lens holding device.

7 is a plan view showing a main part of the apparatus shown in FIG.

FIG. 8 is a partially cutaway front view showing another conventional lens holding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 lens 2 holding body 3 receiving part 3a sucker 15 first swing member 20 second swing member

Claims (1)

[Claims] 1. A lens holding device used for grinding and polishing a lens, wherein a lower end of a shaft portion has an inverted cup shape, and a plurality of suction cups fixed to a lower surface of the inverted cup shaped portion and on the surface. A lens holding device having a receiving portion formed with.