Pentagonal roof prism for viewfinder

Details Pentagonal roof prism for viewfinder Pentagonal roof prism for viewfinder

1980-03-26

1981-09-29

Evans, F. L.

350413, 354155, 354225, G02B 504

Patent

active

042919452

ABSTRACT:
A pentagonal roof prism for a viewfinder has a portion adjacent to its surface of incidence which has a non-homogeneous distribution of refractive indices, whereby said portion serves as a convex lens.

REFERENCES:
patent: 3182576 (1965-05-01), Papke
patent: 3486808 (1969-12-01), Hamblen
patent: 4206991 (1980-06-01), Kobori et al.

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