Optical system with improved field mask

Details Optical system with improved field mask Optical system with improved field mask

1991-05-13

1992-10-13

Hix, L. T.

354225, G03B 1300

Patent

active

051555174

ABSTRACT:
A real image zooming viewfinder has an internal real image that drifts between two optical components. The field mask is placed at the internal image location and is of a thickness equal to or greater than the drift distance.

REFERENCES:
patent: 4545655 (1985-10-01), Fantone et al.
patent: 4707103 (1987-11-01), Ikemori et al.
patent: 4838668 (1989-06-01), Betensky et al.
patent: 4887109 (1989-12-01), Fujita et al.
patent: 4972216 (1990-11-01), Ueda et al.
patent: 5014078 (1991-05-01), Kudo et al.
patent: 5052787 (1991-10-01), Sugawara

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