Tri-power periscope head assembly
US4017148A · kind A · utility
7Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Jul 16, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A tri-power periscope head assembly utilizing three modular optical assemblies comprised of a highly corrected Petzval type objective lens and first and second Galilean telescope assemblies, each of which is adapted to be simply and readily reversible. In one preferred embodiment, the Galilean telescope assemblies have respective powers of 1.4X and 2X. Manually operable reversing means are provided to alter overall visual system magnification at discrete values of 1.5X, 6X and 12X respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.