Adjustable diopter type finder optical system
US4437750A · kind A · utility
17Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1982 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Jun 1, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B19/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An adjustable diopter type finder optical system comprising an eyepiece comprising a first lens component having negative refractive power and a second lens component having positive refractive power, the finder optical system being arranged to make diopter adjustment by moving both of the first and second lens components in the same direction along the optical axis by varying the distance between those lens components and arranged so that variation of magnification and fluctuation of aberrations are small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.