Registers – Coded record sensors – Particular sensor structure
Patent
1984-09-28
1987-11-10
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235436, 235462, 235474, 356385, 364563, G06K 710
Patent
active
047059397
ABSTRACT:
The absolute spatial distance of the widths of individual bars and spaces of a bar code are precisely measured by a bar code scanning apparatus having two photodetector circuit elements positioned a fixed and predetermined distance from each other for sensing light reflected from the bars and spaces of the bar code at a fixed differential time. The photodetectors are part of an integral unit and are parallel in independent circuits connected to a digital processing unit and storage memory for clocking the passage of the two photodetectors over the bars and spaces against an absolute time determined from a constant frequency pulse generator or digital clock. The precise measurement is compared with references and a readout is provided. A method for determining the precise width of each individual bar and space includes the determination of an average velocity determined from the velocity of the photodetectors over the leading edge of a bar or a space, and of the velocity over the trailing edge of the bar or space. From the average velocity and the time, an absolute spatial distance is determined.
REFERENCES:
patent: 3898689 (1975-08-01), D'Orazio et al.
patent: 4232216 (1980-11-01), Helle
patent: 4370724 (1983-01-01), Herbst et al.
RJS Enterprises, Inc.
Trafton David L.
Turner, Jr. Thomas A.
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