Portable scanners capable of scanning both opaque and transparen

Details Portable scanners capable of scanning both opaque and transparen Portable scanners capable of scanning both opaque and transparen

1998-07-31

2000-04-25

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358475, H01J 314

Patent

active

060547073

ABSTRACT:
Scanners disclosed in the present invention uses a dual-illumination system comprising a front illumination source and a back illumination source. The front illumination source is controlled to illuminate a scanning object when the scanning object is opaque. The back illumination illuminates a scanning object when the scanning object is transparent. An optical system collects lights reflected from the opaque scanning object illuminate by the front illumination source or transmitted through the transparent scanning object illuminated by the back illumination source and focuses the lights upon an image sensor, thereby an image of either the opaque scanning object or the transparent scanning object can be obtained.

REFERENCES:
patent: 5705805 (1998-01-01), Han
patent: 5764493 (1998-06-01), Liao
patent: 5780829 (1998-07-01), Tsai et al.
patent: 5895914 (1999-04-01), Tsai

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