Built-in flash camera
US5687400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Apr 5, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photometry part measures a brightness within a shot visual field. A focusing part measures a distance up to a main subject. A focal length measuring part measures a focal length of a taking lens. A strobe light control part directs a strobe to flash regularly and decreases a strobe exposure gradually from a standard exposure in accordance with the measured parameters. The measured distance at which the exposure of the strobe is decreased, is defined as the strobe changeover distance. The strobe light control part sets the strobe changeover distance to be long as the focal length at photographing becomes long, so that the exposure of the main subject on the image surface can be kept proper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.