Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1981-12-16
1983-11-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 136
Patent
active
044171390
ABSTRACT:
This specification discloses an apparatus disposed in the light beam from an object passed through an imaging lens for producing an output variable with movement of the image of the object by the imaging lens in the direction of the optical axis. The apparatus produces, when the image of the object is formed on a predetermined imaging plane, an output corresponding to a critical value representative of the in-focus of the imaging lens to the object and produces, when the image of the object is formed at a position deviated from the predetermined imaging plane, an output corresponding to the amount of said deviation. The apparatus includes detector means disposed at a position biased in the direction of the optical axis from the predetermined imaging plane so as to produce an output corresponding to the critical value when the image of the object is formed on a plane biased by a predetermined amount in the direction of the optical axis from the predetermined imaging plane and to produce an output corresponding to the predetermined amount of bias when the image of the object is formed on the predetermined imaging plane, memory means in which a data representative of the predetermined amount of bias is prerecorded, and means for correcting the output of the detector means on the basis of the prerecorded data.
REFERENCES:
patent: 4264810 (1981-04-01), Utagawa et al.
Hostetter Darwin R.
Nelms David C.
Nippon Kogaku K.K.
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