Apparatus and method for modulating light to generate an index p

Details Apparatus and method for modulating light to generate an index p Apparatus and method for modulating light to generate an index p

1981-08-10

1984-05-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 538

Patent

active

044517319

ABSTRACT:
An apparatus and method are provided to obtain a sharp index pulse with minium side lobes for an optical shaft encoder. By nonuniformly aligned multiple transmissive sections in the encoder wheel and phase plate of the shaft encoder, the transmissive sections become nonprogressively coincident in the light modulation process to provide the desired index pulse. In another preferred embodiment, secondary tracks having nonuniformly positioned multiple transmissive sections provide a parallel modulated light to enhance the index pulse and further reduce side lobes.

REFERENCES:
patent: 3187187 (1965-06-01), Wingate
patent: 4266125 (1981-05-01), Epstein et al.

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