Optical apparatus having visual axis detector and determining wh

Details Optical apparatus having visual axis detector and determining wh Optical apparatus having visual axis detector and determining wh

1991-09-30

1993-01-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250221, 250561, 354 62, 354400, 354219, G03B 1302, G03B 2900, G01V 904

Patent

active

051824434

ABSTRACT:
An optical apparatus includes a view finder through which a subject is observed, a visual axis detection device for detecting a direction of a visual axis of an observer who is looking into the view finder, and a determination device for determining whether or not the observer is wearing eyeglasses.

REFERENCES:
patent: 3804496 (1974-04-01), Crane et al.
patent: 4075657 (1978-02-01), Weinblatt
patent: 4287410 (1981-09-01), Crane et al.
patent: 4574314 (1986-03-01), Weinblatt
patent: 4755045 (1988-07-01), Borgh et al.
patent: 4812033 (1989-03-01), Ishikawa
patent: 4828381 (1989-05-01), Shindo
patent: 5036347 (1991-07-01), Tsunekawa et al.

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