Illuminating window type bright frame finder

Details Illuminating window type bright frame finder Illuminating window type bright frame finder

1995-04-12

1996-12-03

Gellner, Michael L.

Photography

With viewfinder

Electronic

396378, 396385, G03B 1302

Patent

active

055813194

ABSTRACT:
An illuminating window type bright frame finder is provided which comprises an objective lens with a negative focal length, an eyepiece with a positive focal length, a liquid crystal frame, and a half mirror. An optical path from the liquid frame to the eyepiece is formed by positioning the half mirror between the objective lens and the eyepiece. It is possible to observe a visual field image superimposed upon a frame image formed through only the eyepiece. On the condition that an incident angle of light upon the half mirror is 45.degree. and the wavelength of the light belongs to a visible light range, an average reflectance R.sub.p with respect to p-polarized light is R.sub.p <0.35 and an average reflectance R.sub.s with respect to s-polarized light is R.sub.s >0.65.

REFERENCES:
patent: 3053136 (1962-09-01), Ito et al.
patent: 4139278 (1979-02-01), Matsumoto et al.
patent: 4140378 (1979-02-01), Suzuki et al.
patent: 4348091 (1982-09-01), Iizuka
patent: 4478493 (1984-10-01), Yokota
patent: 4750014 (1988-06-01), Frank
patent: 4952956 (1990-08-01), Kikuchi
patent: 4957356 (1990-09-01), Oizuni et al.

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