Picture blur-alarm device for a camera
US4492452A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1983 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Apr 6, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A picture blur-alarm device for a camera includes a photo-electric converter for time-sequentially sending brightness data including analog signal components which correspond to the brightness of the plurality of regions of an optical image of a foreground object, a comparator for comparing two successive brightness data time-sequentially issued from the photo-electric converter, and producing an output signal corresponding to the number of those of the analog signal components of a preceding brightness data which have different levels from corresponding analog signal components of a succeeding brightness data; and an alarm circuit which issues an alarm signal when an output signal from the comparator has a higher level than prescribed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.