Patent
1988-02-05
1989-05-23
Corbin, John K.
350422, 35419512, 354222, G02B 1502, G02B 1310, G02B 118
Patent
active
048324701
ABSTRACT:
A viewfinder system capable of changing over the magnification includes an objective lens unit having at least two negative lens elements replaceable with each other for magnification change-over, and an eyepiece unit having a positive refractive power and constituting an inverted Galilean telescope type viewfinder with the objective lens unit. When the radius of curvature of that surface of one negative lens element for low magnification which is adjacent to the object side is rw.sub.1 and the radius of curvature of that surface of said one negative lens element which is adjacent to the eyepiece side is rw.sub.2 and the radius of curvature of that surface of the other negative lens element for high magnification which is adjacent to the object side is rT1 and the radius of curvature of that surface of said other negative lens element which is adjacent to the eyepiece side is rT2 and Q.sub.W and Q.sub.T are defined as
REFERENCES:
patent: 2755701 (1956-01-01), Altman
patent: 3141921 (1964-07-01), Linke
patent: 4256396 (1981-03-01), Kawaguchi et al.
patent: 4653887 (1987-03-01), Wakamiya
patent: 4715692 (1987-12-01), Yamada et al.
Corbin John K.
Nikon Corporation
Sugarman Scott J.
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