Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-02-05
1993-02-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354403, G01J 120
Patent
active
051855178
ABSTRACT:
For use with an automatic focusing device, a semiconductor integrated circuit is provided for measuring distance having a light-detecting element for receiving light from an object, the distance to the subject is to be measured, and outputting a signal according to the distance from the object. The semiconductor integrated circuit is formed in one chip and includes a distance measurement arithmetic unit for forming digital distance measurement data inversely proportional to the distance to the object from the signal from the light-detecting element; a memory unit for writing therein two items of distance measurement data output from the distance measurement arithmetic unit with regard to two known distances in a calibration mode, and a data arithmeteic unit for computing an automatic focusing device control signal from the two items of distances measurement data stored in the memory unit and distance measurement data output from the distance measurement arithmetic unit in a distance measuring mode.
REFERENCES:
patent: 4620089 (1986-10-01), Schlichting et al.
patent: 4943157 (1990-07-01), Reding
Inamori Masanori
Miyake Toshihide
Nelms David C.
Shami K.
Sharp Kabushiki Kaisha
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