CCD scanner having improved specular reflection discrimination

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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235462, G06K 500

Patent

active

059427620

ABSTRACT:
An optical scanner utilizes two linear CCD detectors and a bandpass means to improve the ability of the scanner to discriminate against specular reflection. A coded symbology is illuminated by a noncoherent light source and light reflected from the coded symbology along a first path strikes the front face of the bandpass means. The bandpass means, functioning as a notch filter, transmits a select bandwidth of light while reflecting all other light onto a first CCD detector. Simultaneously, light reflected from the bar code symbol travels along a second path, at a different angle with respect to the plane of the coded symbology than the first path, is reflected from a mirror onto the back face of the bandpass means. The bandpass means transmits the select bandwidth of light onto a second CCD detector and reflects all other light. The second CCD detector has a notch filter which permits the detection of only the select bandwidth. Since specular reflection is only experienced at a single angle, with respect to the plane of the coded symbology and each CCD detector detects an image at a different angle with respect to the plane of the coded symbology, a complete image can be reconstructed by combining information obtained from both CCD detectors.

REFERENCES:
patent: 3808447 (1974-04-01), Leavens
patent: 4782219 (1988-11-01), Crater
patent: 5149948 (1992-09-01), Chisholm
patent: 5239169 (1993-08-01), Thomas
patent: 5406060 (1995-04-01), Gitin
patent: 5442438 (1995-08-01), Batchelder et al.
patent: 5449892 (1995-09-01), Yamada
Patent Abstracts of Japan, JP 61 201381 A (Ricoh Co. Ltd.), 6 Sep. 1986, see abstract.

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