Albada finder

Details Albada finder Albada finder

1994-10-31

1995-12-12

Hayes, Monroe H.

354224, 354225, G03B 1302

Patent

active

054754585

ABSTRACT:
An Albada finder has a negative objective lens and a positive eyepiece lens. A frame is formed inside the area of the object-side surface of the positive eyepiece lens and a partial reflection area is formed on the eyepiece-side surface of the negative objective lens. The partial reflection area reflects an image of the frame. The frame is formed to enclose a small area of the object-side surface of the eyepiece lens while the partial reflection area is formed to enclose a small area of the eyepiece-side surface of the objective lens. Substantially all of the remaining area of the eyepiece-side surface of the negative objective lens not enclosed by the partial reflection area fully transmits all light incident on the surface.

REFERENCES:
patent: 1678493 (1928-07-01), Van Albada
patent: 2217930 (1940-10-01), Zimmermann
patent: 2487773 (1949-11-01), Schwartz et al.
patent: 3041919 (1962-07-01), Baur et al.
patent: 3149547 (1964-09-01), Jurenz
patent: 3575082 (1971-04-01), McClune
patent: 5218393 (1993-06-01), Nakamura et al.
patent: 5218396 (1993-06-01), Morisawa
patent: 5309201 (1994-05-01), Lyon

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