Observation optical system and optical apparatus having the same

Details Observation optical system and optical apparatus having the same Observation optical system and optical apparatus having the same

1998-09-01

2000-04-25

Perkey, W. B.

Photography

Eye tracking

396373, 396382, 396544, 359507, 359643, 351210, G03B 1306, G03B 1756, A61B 310, G02B 2500

Patent

active

060553766

ABSTRACT:
An observation optical system whose eye relief is below 25 mm includes an eyepiece lens having a water absorptive antifogging coating applied on one surface thereof, and a member holding the eyepiece lens. Further, an eyeball-characteristic detecting system includes a light source for illuminating the eyeball of an observer, a light receiving element arranged on detection of the reflected light from the eyeball through the eyepiece to produce a signal, an optical member positioned in the path of the light from the light source to the light receiving element and having an antifogging coating on one surface thereof, and a circuit receptive of the signal for detecting the characteristic of the eyeball.

REFERENCES:
patent: 5453809 (1995-09-01), Miyano
patent: 5570156 (1996-10-01), Arai et al.
Patent Abstracts of Japan, vol. 6, No. 229 (P-155) (JP 57-130022, Aug. 12, 1982), Nov. 16, 1982.
Patent Abstracts of Japan, vol. 96, No. 1 (JP 07-248401, Sep. 26, 1995), Jan. 31, 1996.

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