Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-11-24
1994-03-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 1, G01N 2186
Patent
active
052948021
ABSTRACT:
In the first aspect, light reflected by an object upon projection of a beam on the object is received by a light-receiving section. A photocurrent corresponding to the irradiated position is detected by a photocurrent detection section and is compared with a predetermined level by a comparison/determination section. An ordinary photocurrent output from the photocurrent detection section prior to projection of the beam is digitally converted by a set/clear section of each bit of a digital value. The converted value is stored in a memory section. In projection of the beam, the ordinary photocurrent corresponding to the output from the memory section is extracted from the photocurrent output from the photocurrent detection section by an ordinary photocurrent extraction section without using a hold capacitor. In the second aspect, light is repeatedly projected from a projecting section on an object, and light reflected by the object is repeatedly received by a light-receiving section. After an object distance is calculated by an analog distance measurement arithmetic section in the light-receiving section, it is A/D-converted into digital data. This digital data representing the object distance is digitally accumulated in an adder section, thereby obtaining an object distance from a plurality of distance measurement arithmetic values without using an integral capacitor.
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Davenport T.
Nelms David C.
Olympus Optical Co,. Ltd.
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