Device detecting focus of a taking lens without decrease in focus detection accuracy when the auto focus area is disposed at an inclination relative to the photographic field
US6686577B2 · kind B2 · utility
0Cited by
9References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 9, 2001 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Mar 9, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical element disposed behind a main mirror and inclined relative to the optical axis is arranged at a position to correct aberration in the luminous flux generated by transmission through the main mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.