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Proceedings Paper

High-speed two-dimensional bar-code detection system with time-sharing laser light emission method
Author(s): Hiroo Wakaumi; Chikao Nagasawa
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Paper Abstract

A novel twodimensional bar-code detection system with time-sharing light emission laser diodes is proposed. A bias current allowing the laser diode to improve the light output rise time is optimized to slightly below the threshold of the diode, so that channel cross-talk among three-layer bar-code signals caused by the bias light can be kept small and a high-speed pulse modulation drive operation can be achieved. A prototype system for a three-layer bar code has achieved an effective scanning speed two and nine tenths times that of conventional scanners. It is estimated from the detection range that the number of time-sharing light emission laser diodes can be increased to at least four, when the current detection amplifier with a bandwidth of 6.4 MHz is used.

Paper Details

Date Published: 15 December 2000
PDF: 6 pages
Proc. SPIE 4087, Applications of Photonic Technology 4, (15 December 2000); doi: 10.1117/12.406387
Show Author Affiliations
Hiroo Wakaumi, Tokyo Metropolitan College of Technology (Japan)
Chikao Nagasawa, Tokyo Metropolitan Univ. (Japan)


Published in SPIE Proceedings Vol. 4087:
Applications of Photonic Technology 4
Roger A. Lessard; George A. Lampropoulos, Editor(s)

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