Camera finder employing holographic view field frames

Details Camera finder employing holographic view field frames Camera finder employing holographic view field frames

1984-04-02

1986-03-18

Mathews, A. A.

354221, 354222, 354466, 350 373, G03B 1312, G03B 1314

Patent

active

045764581

ABSTRACT:
A camera finder capable of indicating a view field frame for determining the range of photographing and a target mark for showing a desired focus adjusting portion. Interposed between an objective lens and an eye lens in this finder are holograms having recorded thereon view field frames and a target mark. The hologram is irradiated by a reference beam or beams, whereby the view field frame and the target mark are regenerated. In the hologram, there are recorded a first view field frame in which a parallax is corrected in the long-medium distance and a second view field frame in which a parallex is corrected in the short distance. A beam source for regenerating each view field frame is selected in accordance with an object distance, whereby a view field frame corresponding to the object distance is regenerated. The parallax can be corrected as described above.

REFERENCES:
patent: 3641900 (1972-02-01), Ataka et al.
patent: 4165930 (1979-08-01), Matsumoto et al.
patent: 4294529 (1981-10-01), Sato et al.
patent: 4374612 (1983-02-01), Matsumura et al.
patent: 4478493 (1984-10-01), Yokota

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