Real-image variable magnification finder including a light shiel

Details Real-image variable magnification finder including a light shiel Real-image variable magnification finder including a light shiel

1992-09-28

1994-05-03

Henry, Jon W.

Optical: systems and elements

Compound lens system

Variable magnification

359740, 359685, 359680, 359691, G03B 1306, G02B 1310, G02B 2314, G02B 15163

Patent

active

053092783

ABSTRACT:
A real-image variable magnification finder is capable of blocking deleterious rays of light without increasing the lens diameter or the size of the erecting prism even of the view angle is large. The improved finder includes, in order from the object side, objective lens system II, condenser lens III with which the image of the object formed by the objective lens system II is directed to eyepiece lens system V, erecting prism system IV for inverting the image of the object, and eyepiece lens system V, and the objective lens system II comprises at least two zooming groups IIA and IIB that will move along the optical axis and light shielding means A that is provided between the zooming groups for blocking deleterious rays of light.

REFERENCES:
patent: 4367927 (1983-01-01), Fujii
patent: 4637690 (1987-01-01), Miyamae et al.
patent: 4779969 (1988-10-01), Sato et al.
patent: 4842395 (1989-06-01), Sato et al.
patent: 4909615 (1990-03-01), Ueda
patent: 4963005 (1990-10-01), Tsuji

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