Water-resistant camera with automatic internal air-pressure adjustment
US4763145A · kind A · utility
20Cited by
2References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Mar 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A water-resistant camera has a lens barrel movable toward and away from a fluid-tight camera body for selecting the position of the lens barrel between wide-angle and telephoto positions. The camera has or can be combined with an automatic air-pressure adjusting mechanism for automatically keeping the air pressure in the inner space of the camera at a substantially constant level irrespective of the position of the lens barrel between the wide-angle position and the telephoto position. Therefore, the lens barrel can smoothly be moved with respect to the camera body upon switching between the wide-angle and telephoto positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.