Kepler-type erect image viewfinder and erecting prism

Details Kepler-type erect image viewfinder and erecting prism Kepler-type erect image viewfinder and erecting prism

1991-02-01

1992-03-10

Adams, Russell E.

Optical: systems and elements

Prism

With reflecting surface

354225, 359366, 359831, 359496, 359669, 359678, G03B 1310, G03B 1308, G02B 504, G02B 1500

Patent

active

050953265

ABSTRACT:
A Kepler-type erect image viewfinder includes a first prism having an emergent surface being formed of a spherical or an aspherical surface and having a positive power. A second prism has an incident surface being formed of a spherical or aspherical surface and also having a positive power. The emergent surface of the first prism is spaced apart from the incident surface of the second prism, with an image-forming plane being positioned closer to the incident surface of the second prism than the emergent surface of the first prism. This arrangement enhances image magnification and compensates for field curvature, while simultaneously allowing for the viewfinder to have a reduced overall length.

REFERENCES:
patent: 3807842 (1974-04-01), Baker
patent: 4941012 (1990-07-01), Inabata
patent: 4945372 (1990-07-01), Higuchi et al.
patent: 4969723 (1990-11-01), Kato et al.
patent: 4992809 (1991-02-01), Nozaki et al.
patent: 5034764 (1991-07-01), Inabata

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