JPH08216007A - Aspherical surface processing device - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention mass-produces high-precision aspherical lenses in a short time from lenses such as lens molded products, rough-ground products, fine-ground products, approximate aspherical shapes, and approximate R-shaped lenses. Provided is an aspherical surface processing device. An aspherical surface processing tool 5 having a grinding or polishing portion 4 in which center cross-sectional shapes of a desired aspherical surface that rotate are continuously connected, a holder 2 for holding a lens 1, and the holder 2 are mounted. A plurality of work spindles 3 that rotate about the center axis of the lens 1 are provided, and the center axes of the lenses 1 are evenly arranged so as to coincide with the center line of the grinding or polishing section 4 of the processing tool 5.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for processing a lens into an aspherical shape.

2. Description of the Related Art Conventionally, processing methods for processing an aspherical surface can be roughly classified into grinding and polishing, glass molding, plastic molding, and composite molding. Among them, in the aspherical surface processing method by grinding and polishing, the lens is rotated about its central axis, and a cutting tool, which is a grinding tool, is reciprocally moved to a desired aspherical shape on the center line of the lens, and the lens is moved to a desired non-spherical shape. It was processed into a spherical shape. Further, a method of processing a polishing tool into a desired aspherical shape, arranging the polishing target and the polishing tool so that their axes coincide with each other, and rotating by polishing while pressing both of them is disclosed in JP-A-2-95557. Was proposed.

There is no grinding and polishing method such as when aspherical surface processing is performed on a lens having a large effective diameter, when a high quality aspherical lens is desired, or when processing is performed in a special shape. There are times when it is impossible to process. At this time, in the conventional processing device by grinding and polishing,
Only one lens can be processed at a time by one processing device. Therefore, the production cost per piece is very high, and it is not suitable for mass production.
Products using the aspherical lens produced by such a conventional grinding and polishing method will be distributed in the market at a high price. An object of the present invention is to mass-produce high-precision aspherical lenses in a short time from lenses such as lens molded products, rough-ground products, fine-ground products, approximate aspherical shapes, and approximate R shapes.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a non-grinding or polishing part having a continuous center cross-sectional shape of a desired aspherical surface which makes a rotary motion or a linear motion. A spherical processing tool, a holder for holding the lens, and a plurality of work spindles mounted with the holder and rotating about the central axis of the lens, the central axis of the lens being on the center line of the grinding or polishing portion of the processing tool. Place it to match.

In the aspherical surface processing device configured as described above, the aspherical surface processing tool having the grinding or polishing portion in which the desired central cross-sectional shape of the aspherical surface is continuously connected, and the holder for holding the lens are mounted. By pressing the aspherical surface processing tool while the plurality of work spindles are rotating, desired aspherical surface processing can be performed on a plurality of lenses at one time.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an aspherical surface processing device according to the present invention will be described below with reference to the drawings in the case of processing an aspherical surface on a convex surface of a lens. FIG. 1 is a sectional view of an essential part of an aspherical surface processing device in an aspherical surface processing tool that makes a rotary motion. Figure 2
[FIG. 3] is a plan view of an aspherical surface processing tool that makes a rotational motion. FIG. 3 is a cross-sectional view of a main part of an aspherical surface processing device in an aspherical surface processing tool that moves linearly. FIG. 4 is a plan view of an aspherical surface processing tool that moves linearly. 1 to 4,
1 and 1'is a lens, 2 and 2'is a holder for holding the lens, and 3 and 3'is a work spindle mounted with the holder 2 or 2'and rotating about the central axis of the lens 1 or 1 '. Reference numeral 4 denotes a circular groove-shaped grinding or polishing portion in which desired aspherical shapes are continuously connected, 4a denotes a grinding portion in which desired aspherical surface shapes are continuously connected, and 4b denotes a desired aspherical surface shape continuous. The connected polishing section 5 is an aspherical surface processing tool having the grinding or polishing section 4 that makes a rotary motion, and 6 is an aspherical surface processing tool having the grinding section 4a and the polishing section 4b that make a linear motion. When performing aspherical surface processing with the aspherical surface processing tool 5 that rotates, in the case of grinding processing, electrodeposition, metal bond,
A diamond layer, which is a diamond tool such as a resin bond, is attached, and in the case of polishing, a polishing member such as a polisher is attached to the grinding or polishing section 4. Further, when performing aspherical surface processing with the aspherical surface processing tool 6 that moves linearly, a grinding part 4a to which a diamond layer, which is a diamond tool such as electrodeposition, metal bond, or resin bond, is attached, and a polishing member such as polisher. The polishing parts 4b attached with are alternately arranged. First, when aspherical surface processing is performed by the aspherical surface processing tool 5 that rotates, the lenses 1 and 1 ′ mounted on the holders 2 and 2 ′ are attached to the work spindles 3 and 3 ′, and the lenses 1 and 1 are mounted. The work spindles 3 and 3'are arranged at equal intervals so that the axis center of the'is aligned with the center line of the circular groove of the grinding or polishing section 4 to which the diamond layer is attached. The aspherical surface processing tool 5 is rotated and pressed with an appropriate force to perform grinding, and then the grinding or polishing section 4 having a diamond layer attached.
Is replaced with the grinding or polishing unit 4 having a polisher attached thereto, and the pressure is applied again as described above, whereby aspherical surface processing can be performed on a plurality of lenses in one aspherical surface processing step. Next, when performing aspherical surface processing with the aspherical surface processing tool 6 that moves linearly, the lenses 1 and 1 ′ mounted on the holders 2 and 2 ′ are attached to the work spindles 3 and 3 ′, and The work spindles 3 and 3 ′ are arranged so that the axial centers of the lenses 1 and 1 ′ are aligned with the center line of the grinding portion 4a, and the work spindles 3 and 3 ′ are rotated, and the aspherical surface machining tool 6 is moved. The work spindles 3 and 3 ′ are moved linearly and pressed with an appropriate force to grind the lens, and then the axial centers of the lenses 1 and 1 ′ are aligned with the center line of the polishing section 4 b. By moving and pressing again as described above, a plurality of lenses can be aspherical processed in one aspherical surface processing step.

As described above, according to the present invention, it is possible to perform aspherical surface processing on a plurality of lenses at the same time with one processing apparatus, so that it is possible to mass-produce the aspherical lens. The production cost per piece can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an aspherical surface processing device in an aspherical surface processing tool that makes a rotational motion.

FIG. 2 is a plan view of an aspherical surface processing tool that makes a rotational motion.

FIG. 3 is a cross-sectional view of a main part of an aspherical surface processing device in an aspherical surface processing tool that moves linearly.

FIG. 4 is a plan view of an aspherical surface processing tool that moves linearly.

[Explanation of symbols]

 1 Lens 2 Holder 3 Work Spindle 4 Grinding or Polishing Part 5 Aspherical Surface Processing Tool 6 Aspherical Surface Processing Tool

Claims (2)

[Claims] 1. An aspherical surface processing tool for processing a lens into an aspherical surface shape, comprising an aspherical surface processing tool having a grinding or polishing portion in which central cross-sectional shapes of a desired aspherical surface that makes rotational movement are continuously connected. A holder for holding a work piece and a plurality of work spindles mounted with the holder and rotating about the central axis of the work piece are provided, and the plurality of work spindles press the aspherical surface processing tool while rotating. An aspherical surface processing apparatus, which obtains a desired aspherical surface shape on a workpiece. 2. A desired aspherical surface shape is obtained for a workpiece with an aspherical surface processing tool which has a grinding portion and a polishing portion in which central cross-sectional shapes of a desired aspherical surface are continuously connected, and which has a linear motion. The aspherical surface processing device according to claim 1.