Automatic focusing device with frequency weighted amplification
US4510384A · kind A · utility
10Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1982 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Aug 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system is automatically focussed by deriving an electrical signal which has a frequency distribution corresponding to the spatial frequency distribution of an image received from a focussing lens; applying to the electrical signal an amplification which is greater at high frequencies than at low frequencies; and adjusting the optical system to maximize the amplified signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.