Apparatus and method for reproducing a pattern in an annular area
US4933714A · kind A · utility
14Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Jun 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70366
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A master disk is positioned such that a radial portion thereof is within a restricted field having good imagery of an optical projection system. A second blank disk is positioned such that the image location extends along a radial portion thereof. As the two disks are rotated synchronously a pattern in an annular area is formed on the blank disk replicating the master. Good imagery of the pattern is obtained with a simple system having an image field less than the size of the object being reproduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.