High-speed two-dimensional bar-code detection system with time-sharing laser light emission method

Hiroo Wakaumi; Chikao Nagasawa

doi:10.1117/12.406387

15 December 2000 High-speed two-dimensional bar-code detection system with time-sharing laser light emission method

Hiroo Wakaumi, Chikao Nagasawa

Proceedings Volume 4087, Applications of Photonic Technology 4; (2000) https://doi.org/10.1117/12.406387
Event: 2000 International Conference on Application of Photonic Technology (ICAPT 2000), 2000, Quebec City, Canada

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.

Citation Download Citation

Hiroo Wakaumi and Chikao Nagasawa "High-speed two-dimensional bar-code detection system with time-sharing laser light emission method", Proc. SPIE 4087, Applications of Photonic Technology 4, (15 December 2000); https://doi.org/10.1117/12.406387

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