Mark indicating device for optical apparatus

Details Mark indicating device for optical apparatus Mark indicating device for optical apparatus

1981-07-13

1983-02-22

Griffin, Donald A.

354289, G03B 1720, G03B 1302

Patent

active

043746128

ABSTRACT:
An optical apparatus includes a transparent body arranged in an optical path of the optical apparatus and incorporating a relief hologram completely embedded therein and recording information of the mark, and an illuminator arranged outside the optical path to illuminate the hologram for providing a reconstructed image of the mark, the illumination being achieved in such a direction that the light passing through the hologram does not enter the optical path.

REFERENCES:
patent: 3560921 (1971-02-01), Lopez
patent: 3633988 (1972-01-01), Farrar
patent: 4165930 (1979-08-01), Matsumoto et al.
patent: 4200380 (1980-04-01), Sato et al.
patent: 4255032 (1981-03-01), Matsumoto et al.
patent: 4294529 (1981-10-01), Sato et al.

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