Distance measuring device
US6470148B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Feb 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention is an inexpensive distance measuring device having short lag time, configured so as to have a pair of light receiving regions at positions of focal points of a pair of image forming optical systems, comprising functions for dividing the light receiving regions and for monitoring the integration control for each divided light receiving region, also comprising an AF area sensor capable of performing pre-integration operations while causing strobe light to be emitted, and a microcomputer that, according to object field luminance distributions obtained from pre-integration results of the AF area sensor and to the focal length value of the photographic lens, divides the light receiving regions of the AF area sensor into respective pluralities, causes final integration operations to be performed while monitoring the integration control in each of the divided light receiving regions, and performs ranging computations based on data obtained for each light receiving region, capable of performing appropriate integration control over the entirety of a wide-range ranging region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.