Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1973-11-07
1977-08-23
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
324 97, G01J 120, G01R 1338, G01R 1340
Patent
active
040442489
ABSTRACT:
Method and apparatus for linearizing the response of a mirror galvanometer or the like to a reference driving signal. An optical assembly transmits through a transmission grating a scanned light beam deflected from a reference signal driven galvanometer mirror. The beam passing through the grating is modulated thereby and received by a photocell. The transmission grating modulates the scanned beam in accordance with the velocity of scan of the light beam and the photocell produces an output signal having a freqency content corresponding to the velocity of the beam. An electrical circuit, in response to the frequency content of the photocell output signal, produces a control signal which is combined with the reference driving signal and applied to the galvanometer to deflect the galvanometer mirror in a manner linearly related to the reference driving signal.
REFERENCES:
patent: 2883649 (1959-04-01), King, Jr.
patent: 2896164 (1959-07-01), Bizouard et al.
patent: 3029387 (1962-04-01), Moe
Anonymous, "Method and Apparatus for Linearizing a Mirror Galvanometer," Research Disclosure, pp. 54-56, Oct. 1972.
Eastman Kodak Company
Grigsby T. N.
Husser John D.
Smith Alfred E.
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