Optical mark sense detector

Details Optical mark sense detector Optical mark sense detector

1977-10-17

1979-07-24

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35 48B, 3401463AG, G06K 710

Patent

active

041624084

ABSTRACT:
Apparatus for detecting marks or other objects by comparing a decrease in reflected light while the mark or object is moving across optics, to the light reflected before the mark or object was encountered by the optics. A threshold reference voltage level is derived directly from the conductance level of a phototransistor prior to the introduction of the mark or object to be detected. This reference level is developed in such a manner as to cause it to be a dynamic voltage, varying percentage-wise as the conductance of the photo-transistor. The dynamic reference level so determined is thus always directly a portion of the level present before the mark or object to be sensed was introduced.

REFERENCES:
patent: 3675201 (1972-07-01), McKissick
patent: 3692982 (1972-09-01), McMillin
patent: 3692983 (1972-09-01), Cucciati
patent: 3944977 (1976-03-01), Holmes
patent: 3983364 (1976-09-01), Firehammer

Affiliated with

Also associated with

Rating

Optical mark sense detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical mark sense detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical mark sense detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1288808