Albada finder with display within the field of view

Details Albada finder with display within the field of view Albada finder with display within the field of view

1984-09-24

1986-04-15

Mathews, A. A.

3542891, G03B 1308, G03B 1720

Patent

active

045824096

ABSTRACT:
An Albada finder is constructed of an objective lens, a reflection layer, a field-of-view defining frame, and an eyepiece arranged in sequence to provide a mirror image of the frame from the reflection layer to the eyepiece. An optical device of positive power is arranged outside an optical path of the finder. An information source with an information display plate and an illuminator for illuminating the display plate are arranged so that light from the display plate comes through the optical device into the eyepiece as an oblique beam. This shortens the distance from the reflection layer to the eyepiece while achieving a sharp information display.

REFERENCES:
patent: 3575082 (1971-04-01), McClure
patent: 4217050 (1980-08-01), Sato et al.
patent: 4429978 (1984-02-01), Ikari
patent: 4441802 (1984-04-01), Iizuka
patent: 4530583 (1985-07-01), Yamada

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