Supplemental lens positioning system for a fixed focus lens camera
US5189464A · kind A · utility
2Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Dec 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B19/07
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A simplifed open loop focus control system for a fixed focus lens camera that positions a supplemental lens into the optical path of a fixed focus lens, for relatively remote subjects, in response to a signal representative of subject reflectivity. Inserting such a lens in this manner substantially reduces focus control system complexity while at the same time minimizing the frequency of supplemental lens movement for most exposures which are typically of subjects that are relatively close to the fixed focus lens camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.