Bar code reader with enhanced sensitivity

Details Bar code reader with enhanced sensitivity Bar code reader with enhanced sensitivity

1986-09-10

1989-11-21

Pellinen, A. D.

Registers

Coded record sensors

Particular sensor structure

235465, 235469, G01J 334

Patent

active

048824763

ABSTRACT:
In laser bar code scanners bright sunlight tends to overpower the reflected laser light, drastically reducing the difference between bar code and background signals. In the present bar code reader, a plurality of light detectors are utilized with different spectral response characteristics at the wavelength of the incident laser beam, such that the differential response of the detectors tends to minimize the effect of background illumination. Narrowband optical filters with offset passbands may be used with conventional light sensors. As another example, filters with long wavelength transmission characteristics and offset cutoff wavelengths may be employed if necessary with a neutral density filter to provide balanced responses under broadband illumination.

REFERENCES:
patent: 3643066 (1972-02-01), Coliz et al.
patent: 3784832 (1974-01-01), Sewell

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