# US 7,070,474 B2 · Aspheric-surface processing method and aspheric-surface forming method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,070,474 B2
- Document ID: US7070474B2
- Status: Granted
- Kind: B2
- Application number: 10/779,867
- Filed: 2004-02-18
- Published: 2004-12-16
- Granted: 2006-07-04
- Earliest claimed: 2003-02-21
- Assignees: Seiko Epson Corporation
- Inventors: Makoto Miyazawa
- Web page: https://patentgrep.com/patent/US7070474B2

## CPC

- B24B 13/046: {using a pointed tool or scraper-like tool (B24B13/015 and B24B13/065 take precedence)}
- B24B 13/06: grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
- Y10T 82/10: Process of turning
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An aspheric-surface processing method according to the present invention, uses a cutting apparatus including at least one turning tool movable in the same direction as the rotating axis of the work and is also movable in a direction perpendicular to the rotating axis of the work. This method includes moving the turning tool at a predetermined feed pitch in a fixed direction over at least a part of the work region extending from the center of the rotating axis of the work to a peripheral portion of the work and also moving the turning tool in another direction perpendicular to the rotating axis of the work in order to process the work for forming an axis-asymmetric aspheric surface.

## Claims

### Claim 1

An aspheric-surface processing method using a cutting apparatus comprising at least one turning tool movable in the same direction as a rotating axis of a work and in a direction perpendicular to the rotating axis of the work, the method comprising:
moving the turning tool at a predetermined feed pitch in a fixed direction over at least a part of a region of the work extending from a peripheral portion of the work to a center of the rotating axis of the work; and
moving the turning tool in another direction perpendicular to the rotating axis of the work in order to process the work for forming an axis-asymmetric aspheric surfaces
wherein, while forming the axis-asymmetric aspheric surface, the turning tool moves in the fixed direction without performing a reciprocating motion in an opposite direction.

### Claim 2 (depends on 1)

The aspheric-surface processing method according to claim 1, further comprising moving the turning tool at a different predetermined feed pitch in the fixed direction over another part of a region of the work.

### Claim 3 (depends on 2)

The aspheric-surface processing method according to claim 2, further comprising moving the turning tool at a lower predetermined feed pitch in the fixed direction over a peripheral region of the work.

### Claim 4 (depends on 1)

The aspheric-surface processing method according to claim 1, wherein, with respect to a direction parallel to the rotating axis of the work, the turning tool only moves in one fixed direction from the peripheral portion of the work to the center of the rotating axis of the work.

### Claim 5 (depends on 1)

The aspheric-surface processing method according to claim 1, wherein the turning tool cuts the work in a helical path in a non-zigzag manner on X-axis.

### Claim 6 (depends on 1)

The aspheric-surface processing method according to claim 1, wherein the fixed direction is on X-axis.

### Claim 7 (depends on 1)

The aspheric-surface processing method according to claim 1, wherein the work is rotated in a range of 100 to 3,000 rpm for roughing and finishing operations, wherein the predetermined feed pitch is in a range of 0.005 to 1.0 mm/rev. for the roughing operation and in a range of 0.005 to 0.2 mm/rev. for the finishing operation, and wherein an amount of incision is in a range of 0.1 to 10.00 mm/pass for the roughing operation and 0.05 to 3.0 mm/pass for the finishing operation.

### Claim 8 (depends on 7)

The aspheric-surface processing method according to claim 7, wherein when performing both the roughing and finishing operations, the turning tool moves in the fixed direction on X-axis without performing reciprocating motions.