Registers – Coded record sensors – Particular sensor structure
Patent
1984-10-04
1987-07-07
Pitts, Harold I.
Registers
Coded record sensors
Particular sensor structure
235462, 235466, 235487, 235464, G06K 710
Patent
active
046788980
ABSTRACT:
A concealed code of a card or badge arranged along a line parallel to one edge is read by advancing the card or badge along a slot defined between two internal chambers of a sensor housing that accomodate an infra-red light-emitting diode and a phototransistor respectively. The two chambers are provided with holes disposed on opposite sides of the slot to facilitate a beam of infra-red radiation passing through the holes and across the slot to read the code embodied in the card or badge. The surface at the bottom of the slot slopes upwardly from the peripery of the housing to a point of maximum height midway through the slot that is immediately below the point at which the infra-red beam passes across the slot so that the beam reads the code even when the edge of the card 1 is slightly misaligned. The code is recorded with successive binary digits represented by transparent windows alternating with regions opaque to infra-red radiation, the said windows and opaque regions being arranged along a line parallel to one edge of the card, each window representing a binary digit of the code with one binary digit being represented by first generally rectangular windows of higher transmissivity and the other binary digit being represented by windows of substantially the same dimensions as the first windows but of lower transmissivity.
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Pitts Harold I.
Time and Data Systems International Limited
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