Aperture member for photo plotting apparatus

Details Aperture member for photo plotting apparatus Aperture member for photo plotting apparatus

1987-02-19

1988-08-02

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350319, 356310, G02B 2602, G01J 304

Patent

active

047610573

ABSTRACT:
Photo plotter aperture members each have a beam forming trasnsparent ring and a central transparent cross in communication with the ring. The rings of the different members are of different diameters but of the same thickness as the lines of the respective crosses to provide uniform exposure during half diameter strokes of the aperture members.

REFERENCES:
patent: 2725781 (1955-12-01), Banker
patent: 3729252 (1973-04-01), Nelson
patent: 4299443 (1981-11-01), Minami et al.
patent: 4664516 (1987-05-01), Coppa et al.

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