Focus detection condition display device for camera
US4812912A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | May 18, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/635
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus detection condition display device suitable for use in a camera provided with an electronic viewfinder. The pattern signal corresponding to a focus detection zone on which focus detection is conducted by a focus detecting system is superimposed on the video signal of the object field and said signal is output to an electronic viewfinder. When the focus detection has become impracticable for such reason as lack of contrast of the object field, or focusing has become impracticable because of the object coming too close to the camera, an alarm is issued by the pattern corresponding to a focus detection zone displayed on the electronic viewfinder displaying in a manner different from that ordinarily used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.