Device for producing a signal indicating the directional movemen

Details Device for producing a signal indicating the directional movemen Device for producing a signal indicating the directional movemen

1975-04-18

1977-03-08

McGraw, Vincent P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237G, 353101, 356126, G01J 120, G01B 300

Patent

active

040114465

ABSTRACT:
A light focus sensor having first and second grids comprised of interlaced light transmissive and light reflective portions and a rotating optical modulator comprised of a plurality of alternate light transparent and light opaque portions. The modulator portions are half the size of the reflective portions of the grids and the modulator is positioned in relation to the grids such that the phase relationship between the portions of one grid and the portions of the modulator is 180.degree. different than the phase relationship between the portions of the other grid and the portions of the modulator such that the composite signal passing through the modulator is indicative of the directional movement required to achieve focus.

REFERENCES:
patent: 3421815 (1969-01-01), Donitz
patent: 3783270 (1974-01-01), Kamachi
patent: 3798449 (1974-03-01), Reinheimer

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