Active-type auto-focusing mechanism
US4814810A · kind A · utility
12Cited by
6References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Oct 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An active-type autofocusing mechanism includes a light projector for projecting a light beam from a light source toward an object. A photo detector arrangement includes separate position-sensitive photo detectors disposed with equal spacing in opposite direction with respect to the light projector. A processor is connected to the photodetector arrangement for calculating the distance to the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.