Optical: systems and elements – Lens – With variable magnification
Patent
1991-02-08
1992-12-22
Hannaher, Constantine
Optical: systems and elements
Lens
With variable magnification
359686, G02B 1514
Patent
active
051738066
ABSTRACT:
A variable magnification viewfinder comprising, in the order from the object side, an objective lens system having a positive refractive power, a field lens component having a positive refractive power and an eyepiece lens system having a positive refractive power; said objective lens system comprising a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power, and said variable magnification lens system being designed in such a manner that it performs variation of magnification and correction of diopter by moving said second lens unit and said third lens unit along the optical axis so as to vary the airspace reserved between these lens units with said first lens unit kept fixed on the optical axis.
The variable magnification viewfinder has a variable magnification ratio on the order of 2, a compact design and favorably corrected aberrations, and can be manufactured at a low cost in practice.
REFERENCES:
patent: 4054371 (1977-10-01), Yasukuni
patent: 4527867 (1985-07-01), Fujioka et al.
patent: 4653873 (1987-03-01), Kawamura
patent: 4757336 (1988-07-01), Nakayama et al.
patent: 4846562 (1989-07-01), Tokumaru et al.
patent: 5062695 (1991-11-01), Iwasaki
Hanig Richard
Hannaher Constantine
Olympus Optical Co,. Ltd.
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