Apparatus and a method for position detection of an object stepp

Details Apparatus and a method for position detection of an object stepp Apparatus and a method for position detection of an object stepp

1984-08-21

1987-02-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356400, G01N 2186, G01V 904

Patent

active

046410350

ABSTRACT:
An apparatus and method for position detection for an object having a detection pattern formed by a concavity or convexity. The position detecting apparatus includes a scanning system for scanning the object with a light beam, a photoelectric transducer for receiving the information light reflected from the detection pattern to produce an electric signal, and a processing unit for computing, on the basis of the electric signal, the position of the detection pattern. Unwanted components included in the information light are prevented from being received by the photoelectric transducer, or electric signals corresponding to the unwanted components are excluded, so that the accuracy of signal processing and the accuracy of position detection are improved.

REFERENCES:
patent: 3739247 (1973-06-01), Yamaguchi et al.
patent: 3885877 (1975-05-01), Horwath et al.
patent: 4092068 (1978-05-01), Lucas et al.
patent: 4112309 (1978-09-01), Nakazawa et al.
patent: 4406546 (1983-09-01), Suzuki et al.
patent: 4553845 (1985-11-01), Kuroki et al.

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