Finder optical system

Details Finder optical system Finder optical system

1989-06-05

1990-05-15

Hix, L. T.

350432, G03B 1302

Patent

active

049262017

ABSTRACT:
A finder optical system comprises from the object side an objective lens having a positive refractive power as a whole, a condenser lens arranged in the vicinity of an image plane of the objective lens, an eyepiece consisting of a single lens element and having a positive refractive power, and further comprises a prism installed between the condenser lens and the eyepiece to introduce light fluxes having been passed through the condenser lens into the eyepiece, and wherein the finder optical system fulfills the following conditions; .nu.<50, 15 mm<fe<50 mm, 0.7<L/fe <1, wherein, .nu. represents an Abbe number of the prism, fe represents a focal length of the eyepiece, and L represents an optical path length of the prism defined as a ratio of thickness of the prism to the refractive index thereof. Thereby, axial chromatic aberration can be corrected well, and additionally, a finder image with high mangification is obtainable. Furthermore, compactness and cost reduction can be attained owing to the simple constitution.

REFERENCES:
patent: 4437750 (1984-03-01), Ikari
patent: 4593984 (1986-06-01), Kimura et al.
patent: 4707103 (1987-11-01), Ikemori et al.
patent: 4765725 (1988-08-01), Suda

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