Bar code scanner with diffusion filter and plural linear light s

Details Bar code scanner with diffusion filter and plural linear light s Bar code scanner with diffusion filter and plural linear light s

1985-08-21

1988-05-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, G06K 710

Patent

active

047437731

ABSTRACT:
The present invention provides a bar code scanner applicable for use to scan various bar codes of different standards and sizes. Any malfunction due to nonuniform illumination of the bar code or maloperation can be prevented, and also the light source may not be normally turned on. This bar code scanner is usable as held by hand or fixed as desired.
The opening of the scan head of the inventive bar code scanner is formed polygonal, and high light-transmission diffusion filter is provided between the light source and the opening. The light source consists of spot light sources disposed in plural linear arrays including the ones which are normally on for sensing the proximity to a bar code and the others which are turned on and off depending on whether the scan head is near or far from a bar code.
Furthermore, the scan head enclosure consists of a gripping portion for the operation of the scanner as held by hand and a flat bottom portion for use in operating the scanner as fixed; both portions are integrally formed to be the enclosure in which a light source, photodetector, decoder and interface.

REFERENCES:
patent: 4182956 (1980-01-01), Funk, Jr. et al.
patent: 4251798 (1981-02-01), Swartz et al.
patent: 4409470 (1983-10-01), Shepard
patent: 4496831 (1985-01-01), Swartz
patent: 4538060 (1985-08-01), Sakai
patent: 4570057 (1986-02-01), Chadima
patent: 4603262 (1986-07-01), Eastman

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