Picture image observation system
US4444462A · kind A · utility
16Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1981 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Aug 28, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A protective lid is provided in front of an image-forming lens mounted on the forward end of a picture image transmission line which comprises plural optical fibers bundled in alignment to be remotely controlled from the back end of the transmission line for opening/closing so that the image-forming lens may be protected from particles, vapor or poisonous gas when the transmission line is used in such atmosphere, thereby preventing deterioration of the quality of picture images to be formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.