Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1974-07-31
1976-06-01
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, 250233, 353101, G01J 136
Patent
active
039611779
ABSTRACT:
Disclosed is a device for automatically focusing optical images wherein a rotating transparent disk having at least two sections of different focus delay characteristics is operative to pass a portion of an image carrying beam therethrough and onto a photoconductor. Output signals from the photoconductor are indicative of the degree of image clarity of the light incident thereto and these signals are passed to signal detector circuits wherein the signal resulting from light passing through the first section of the disk are compared with those signals resulting from light passing through the second section. The comparison of these signals is indicative of the degree of focus of the light beam and an error signal corresponding thereto is created from the outputs of the signal detector circuit.
REFERENCES:
patent: 2838600 (1958-06-01), Salinger
patent: 2999436 (1961-09-01), Faulhaber
patent: 3783269 (1974-01-01), McConnell
patent: 3856407 (1974-12-01), Takeda et al.
Goodyear Aerospace Corporation
La Roche Eugene
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