Lens characterization apparatus and method
US4767215A · kind A · utility
10Cited by
4References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1986 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Jun 9, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/706
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A beam of light, such as a laser, is used to scan across a lens. The beam passing through the lens is modulated by an optical encoder which controls the amount of the beam passing through the encoder to a light receptor. The received light is quantified and processed to determine any distortion caused by the lens. The encoder is comprised of a set of transparent windows upon an opaque face, the windows having a certain pattern that a beam travelling across the windows casts a specific light intensity pattern. The encoder also allows determination of astigmatism of the lens and distortion inherent in the beam itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.