Registers – Coded record sensors – Particular sensor structure
Patent
1993-09-23
1995-06-20
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
235455, 235470, G06K 710
Patent
active
054262887
ABSTRACT:
An optical information reading method and device which prevents the generation of erroneous reading by specifying a reliable reading range for a bar code or like information. A microcomputer calculates the distance between the position of reflection of laser light from the bar code and a position at which the same laser light enters the scanning unit based on a time difference between the emission of the laser light and the reception of the reflected laser light. The microcomputer determines, through the calculation process, that the bar code is present within the suitable reading range only when the calculated distance is determined to be within the set reading range, and permits the scanning of the bar code.
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patent: 4877949 (1989-10-01), Danielson et al.
patent: 4920255 (1990-04-01), Gabeler
patent: 5177343 (1993-01-01), Takenaka
patent: 5179286 (1993-01-01), Akasu
patent: 5216230 (1993-06-01), Nakazawa
patent: 5248871 (1993-09-01), Takenaka
patent: 5260554 (1993-11-01), Grodevant
Goto Katsunori
Obata Kenzo
Frech Karl D.
Hajec Donald
Nippondenso Co. Ltd.
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