Focal length varying device for camera
US4870439A · kind A · utility
16Cited by
1References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1989 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Jan 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focal length varying device for a camera comprises a photo taking optical system having a variable focal length; a discriminating device for discriminating whether or not adequate photographing is possible; and a system for automatically changing the focal length of the photo taking optical system on the basis of the result of discrimination made by the discriminating device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.