Panoramic viewfinder mask
US5404189A · kind A · utility
8Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Nov 30, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The viewfinder of a camera include one or more lens elements that zoom in coordination with the camera's taking lens, and normal/panoramic masking plates that pivot about horizontal axis in coordination, with moving masking plates for the camera's back frame opening or with signaling elements. Since the panoramic masking plates are not in the image plane, the aperture in a provided aperture plate is a horizontal slit opening, which provides a great depth of focus, to maintain image sharpness, when the masking plates are in the panoramic position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.