Objective optical system for endoscopes
US5547457A · kind A · utility
166Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B1/00174
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An objective optical system for endoscopes comprising a plurality of lens components and an aperture stop, and configured so as to permit adjusting a distance to an object to be observed simply by exchanging a lens component disposed in the vicinity of the aperture stop with another lens component having a focal length different from that of the lens component disposed in the vicinity of the aperture stop. This objective optical system for endoscopes can have an optimum depth of field by changing a diameter of the aperture stop along with the exchange of the lens component disposed in the vicinity of the aperture stop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.