Encoded shutter blade apparatus

Details Encoded shutter blade apparatus Encoded shutter blade apparatus

1982-12-28

1984-05-01

Adams, Russell E.

354458, 354480, G03B 714

Patent

active

044457626

ABSTRACT:
An encoding system for a shutter blade arrangement of the scanning type comprising a plurality of spaced apart slits in each of the shutter blade elements arranged to sequentially overlap each other between a source of illumination and a photoresponsive element during displacement of the shutter blade elements to provide an output waveform indicative of the instantaneous position of the shutter blade elements with double the resolution or accuracy heretofore provided by shutter blade encoding systems having identically sized and spaced slits.

REFERENCES:
patent: 3942183 (1976-03-01), Whiteside
patent: 4009866 (1977-03-01), Iwata et al.
patent: 4040072 (1977-08-01), Johnson et al.
patent: 4053907 (1977-10-01), Iwata et al.
patent: 4075641 (1978-02-01), Uno et al.
patent: 4317624 (1982-03-01), Shenk
patent: 4345828 (1982-08-01), Johnson

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