JP2002144205A - Polishing device and manufacturing method for optical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polishing device with excellent polishing efficiency. SOLUTION: An object to be polished holding device 4 has an H type cross section. A first lens 3 and a second lens 5 are held on an object to be polished mounting part 4a and an object to be polished mounting part 4b on both sides, respectively. The surface of the first lens 3 is brought into contact with a polishing part of a first polishing plate 1. In a second polishing plate 6, a polishing surface is brought into contact with the surface of the second lens 5. A holding part 8 is provided on an opposite side (upper part) of the polishing surface of the second polishing plate 6 and a screw part formed at a tip part of pin 10 is fitted into a screw joint part 9 formed on the upper end face of the holding part 8. When the first grinding plate 1 is rotated in this state, the pin 10 is oscillated. Each relative motion occurs between the polishing part of the first grinding plate 1 and the lens 3 and the polishing part of the second polishing plate 6 and the lens 5, respectively. Polishing of the lens 3 and polishing of the lens 5 are simultaneously performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing apparatus used for polishing an object to be polished (such as a lens) and a method for manufacturing an optical member using the polishing apparatus.

[0002]

2. Description of the Related Art In the manufacture of optical members such as lenses, a polishing step of the surface is indispensable. For example, when manufacturing a lens, first, a cutting device called a curve generator is used to process the surface so as to have a predetermined curvature. In this state, the surface is very rough, and the surface is thereafter polished by a polishing process called diamond lapping to make it smooth.

FIG. 2 shows an example of such a polishing apparatus.
An abrasive 12 such as a diamond pellet is fixed to a curved surface of a polishing plate 11 having a curvature corresponding to the curvature of a lens 14 to be polished. The lens 14 is adhered to the lens holder 13 using an adhesive or the like that can be peeled off after rosin.

[0004] The lens holder 13 is provided with a holding portion 13a at a central portion thereof, and a spherical bearing portion 13b, which is a hemispherical concave portion, is provided on a flat upper end portion of the holding portion 13a. A hairpin 15 having a spherical portion at the tip is fitted into the spherical bearing portion 13b. In addition, FIG.
FIG. 4 is a longitudinal sectional view passing through a central axis, and each member is rotationally symmetric with respect to the central axis except for an abrasive 12.

In the state shown in FIG. 2, the polishing plate 11 is rotated around the central axis, and at the same time, the pin 15 is swung. Then, relative movement occurs between the polishing material 12 of the polishing plate 11 and the lens 14, and polishing is performed. During this time, by pressing the pin 15 downward,
Pressure is applied between the abrasive 12 and the lens 14.

[0006]

Generally, when polishing an optical member such as a lens, it is necessary to polish both surfaces thereof. In polishing by a conventional polishing apparatus as shown in FIG. 2,
Since only one side can be polished, two polishing steps were required to process both sides. Polishing requires rough polishing and precision polishing, but a conventional polishing apparatus can perform only one of them, so that two polishing steps are required. Therefore, there is a problem that a long time is required for the polishing process.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a polishing apparatus having high polishing efficiency and a method for manufacturing an optical member using the same.

[0008]

A first means for solving the above problems is a first polishing dish which rotates around a rotation axis, and a polishing object holding member capable of holding a polishing object on both surfaces. A polishing apparatus (claim 1), comprising: an apparatus; and a second polishing plate that is rocked by a rocking device.

In this means, first, the objects to be polished are fixed to both surfaces of the device for holding the object to be polished. Then, the surface of one of the objects to be polished is brought into contact with the polishing surface of the first polishing dish, which is located at the lowermost position and whose polishing surface is directed upward. Then, the polishing surface of the second polishing plate facing downward is brought into contact with the surface of the other polishing object facing upward. The second polishing plate is pressurized by a pressure source such as air, and sandwiches the two objects to be polished and the material to be polished between the first polishing plate and the first polishing plate.

In this state, the first polishing dish is rotated, and the second polishing dish is given a swinging motion and a rotating motion. Normally, the rotational motion given to the second polishing dish is given by transmitting the rotational motion of the first polishing dish to the workpiece holding device, but the second polishing dish is forced to rotate itself. A suitable mechanism may be provided. Then, relative movement occurs between the first polishing dish and the polishing object that comes into contact therewith, and between the second polishing dish and the polishing material that comes into contact therewith, and the two polishing objects are polished simultaneously.

As described above, according to the present means, since two objects to be polished can be polished simultaneously, the polishing time can be reduced to half of the conventional one and the polishing efficiency can be greatly improved. . Of course, a swinging motion may be given to the lower polishing dish, and the upper polishing dish may be rotated.

A second means for solving the above-mentioned problem is as follows.
The first means, wherein the first polishing dish is a polishing dish for precision polishing, and the second polishing dish is a polishing dish for coarse polishing (claim 2). is there.

In the first means, since the first polishing dish is directly rotated, the relative movement between the first polishing dish and the object to be polished is larger than that between the second polishing dish and the object to be polished. Speed is faster than the relative motion of In this means, by utilizing this property, the first polishing plate having a high relative movement speed is used for precision polishing, and the second polishing plate having a low relative movement speed is used for rough polishing. It is possible to carry out both types of polishing, and work efficiency is improved.

A third means for solving the above-mentioned problem is as follows.
The second means, wherein the first polishing dish is for performing precision polishing of a workpiece roughly polished by the second polishing dish (Claim 4). .

In this means, after the polishing is finished, the object to be polished is removed, and the object to be polished is attached instead. Then, the object-to-be-polished holding device is inverted so as to be sandwiched between the first polishing dish and the second polishing dish. By repeating this, it is possible to efficiently perform rough polishing and precision polishing of one object to be polished.

A fourth means for solving the above-mentioned problem is as follows.
A method of manufacturing an optical member, comprising a step of polishing a surface using any one of the first to third means.

This means is the same as the conventional method for manufacturing an optical member except that any one of the first to third means is used for polishing the surface. According to this means, since the optical member can be manufactured efficiently, an optical member having a short manufacturing time and a low manufacturing cost can be manufactured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a polishing apparatus as an example of an embodiment of the present invention. In FIG. 1, 1 is a first polishing dish, 2 is an abrasive (pellet), 3
Is a first lens, 4 is a work holding joint which is an object holding device, 4a and 4b are work sticking dishes, 5 is a second lens, 6 is a second polishing dish, 7 is an abrasive (pellet), 8 is a holding part, 9 is a screw joint part, and 10 is a pin. FIG. 1 is a cross-sectional view including a central axis, and abrasives 2 and 7 are shown.
All the elements except for have a shape rotationally symmetric with respect to the central axis.

The first polishing dish 1 is installed at the lowermost position, and is arranged with the polishing surface to which the polishing material 2 such as diamond pellets is attached facing upward. The first polishing dish 1 is adapted to be rotated about its central axis. The work holding joint 4 has an H-shaped cross section, and the first lens 3 and the second lens 5 are respectively provided on both sides of the work sticking dishes 4a and 4b, which are part of the H-shaped cross section. It is adhered and held by a peelable adhesive. First
The surface of the lens 3 is brought into contact with a polishing portion (a surface provided with an abrasive) of the first polishing dish 1.

The second polishing dish 6 is disposed with the polishing surface on which the abrasive 7 such as diamond pellets is attached facing downward, so that the polishing surface contacts the surface of the second lens 5. . A holding portion 8 is provided on the opposite side (upper part in the figure) of the second polishing plate 6 from the polishing portion, and a tip end of a pin 10 is screwed into a screw joint portion 9 formed on an upper end surface thereof. . The pin is rotatable together with the polishing plate 6 and the holding portion 8.

In this state, the first polishing dish 1 is rotated and the pin 10 is swung. Then, the distance between the polishing section of the first polishing dish 1 and the lens 3 and the second polishing dish 6
Relative movement occurs between the polishing part of the lens and the lens 5,
Polishing of the lens 3 and polishing of the lens 5 are performed simultaneously.

In this embodiment, the second polishing dish 6
It is particularly preferable that the first polishing dish 1 is used for precision polishing, and the lens roughly polished by the second polishing dish 6 is precision polished by the first polishing dish 1. . In this way, after the polishing is completed, the lens 3 is removed, a lens for performing rough polishing is attached instead, the work holding joint 4 is turned upside down, and the lens 5 is polished on the first polishing plate 1. Polishing is performed by abutting the portion. By repeating this, rough polishing and precision polishing of the lens can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a polishing apparatus as an example of an embodiment of the present invention.

FIG. 2 is a schematic view showing an example of a conventional polishing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st grinding plate 2 ... Abrasive material (pellet) 3 ... 1st lens 4 ... Work holding joint 4a, 4b ... Work attaching plate 5 ... 2nd lens 6 ... 2nd grinding plate 7 ... Abrasive material ( Pellet) 8 ... Holding part 9 ... Screw joint part 10 ... Kanzashi pin

Claims (4)

[Claims] A first polishing plate that rotates around a rotation axis, a polishing object holding device that can hold a polishing object on both surfaces, and a second polishing plate that is rocked by a rocking device. A polishing apparatus comprising: 2. The polishing apparatus according to claim 1, wherein said first polishing dish is a precision polishing polishing dish, and said second polishing dish is a coarse polishing polishing dish. Polishing equipment. 3. The polishing apparatus according to claim 2, wherein the first polishing dish performs precision polishing of a workpiece roughly polished by the second polishing dish. Polishing equipment. 4. One of claims 1 to 3
13. A method for producing an optical member, comprising a step of polishing a surface by using the polishing apparatus according to any one of the above items.