DATAKENNARANORDNING FOR ETT UPPTECKNINGSMEDIUM SOM UPPBER DATA I FORM AV KODADE OMRADEN MED OLIKA STRALNINGSREFLEKTERANDE EGENSKAPER

• Main Authors: CHRISTIE J B, RUNQUIST JR R C, ROBISON G W
• Format: Patent
• Language: Swedish
• Published: 24.05.1976
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

A color bar code reader used for detecting and reading recorded indicia having different and distinct light reflective characteristics; i.e., being manifested in the form of colored bars. The reader utilizes a photosensor and two light-emitting diodes, each having a particular output wavelength. The particular embodiment disclosed utilizes a gallium arsenide diode which emits infrared light at 9,000 Angstroms and a gallium arsenide phosphide diode which emits red light at 6,600 Angstroms. In operation, the two light-emitting diodes are alternately pulsed, with the outputs of each being directed an the recorded indicia. A lens system focuses the light-emitting diode radiation onto the recorded indicia. Depending upon the particular colored indicia being utilized, a certain amount of light is reflected, or not reflected, by the colored indicia back to the color bar code reader, where the radiation is concentrated by the lens system for transmission to the solid state photosensor. The photosensor generates a signal proportional to the reflected light which is related to the original light source. Circuitry determines the particular color which reflected the returned light. The generated photosensor signals, which are analog in nature, are processed and digitized by circuitry for a determination of the color represented and are then transmitted to some record keeper. The particular colors utilized with the present invention are white, green, and black, which are recorded on a record medium in the form of bars.