Photosensor apparatus with light integration control
US4547676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1983 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Jan 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photosensor apparatus for detecting focal position or the like, which uses a plurality of light-receiving elements arranged in a matrix array, is disclosed. Simultaneous light integration is started with respect to all the light-receiving elements, while all the outputs of the light-receiving elements are progressively scanned immediately after the start of the simultaneous light integration. When at least one of the outputs reaches a first reference level, all the outputs are held. If at least one of the held outputs is above a second reference level of a different level, check as to whether all the outputs are below the second reference level is repeatedly done for progressively reducing light integration periods until all the outputs of the light-receiving elements are at a fixed level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.