Objective lens system for an endscope
US4674844A · kind A · utility
81Cited by
3References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Jul 24, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An objective lens system for an endoscope comprises a first lens component having a negative refracting power, a second lens component having a positive refracting power, a third lens component having a positive refracting power and a fourth lens component involving a meniscus lens having its concave surface facing the object side, with the lens system being such that the total length is short, the outside diameter is small, the angle of view is wide, and the illuminance in the peripheral portion of the image field is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.