Registers – Coded record sensors – Particular sensor structure
Patent
1982-09-13
1985-08-27
Pitts, Harold I.
Registers
Coded record sensors
Particular sensor structure
235466, 235462, 235487, 235494, G06K 710
Patent
active
045380597
ABSTRACT:
An instruction or identification card or badge for use in a time recording system, to authorize admission to restricted locations or for use in credit transactions comprises layers of material that is opaque to visible light but transparent to infra-red radiation. A code that is readable by an optoelectronic reader but is invisible in ordinary light is provided by transparent windows alternating with infra-red opaque regions arranged along a line parallel to one edge of the card, one binary digit being represented by wide rectangular windows and the other binary digit being represented by narrower windows that when read in a badge reader give different peak heights. The code is self-clocking and need occupy only a small portion of the card area.
REFERENCES:
patent: 3534166 (1970-10-01), Korpel
patent: 3752963 (1973-08-01), Herrin
patent: 3783245 (1974-01-01), Howell
patent: 3949233 (1976-04-01), Gluck
patent: 4044231 (1977-08-01), Beck
patent: 4096992 (1978-06-01), Notiri
patent: 4237376 (1980-12-01), Giacomotti
patent: 4359633 (1982-11-01), Bianco
ITR International Time Limited
Pitts Harold I.
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