Decodable indicia reading terminal with optical filter
AssigneeHand Held Products, Inc.
InventorsYiwu Ding, Chen Feng, Ynjiun Paul Wang
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Abstract
A decodable indicia reading terminal can comprise a housing including a housing window, a multiple pixel image sensor disposed within the housing, an imaging lens configured to focus an image of decodable indicia on the image sensor, an optical bandpass filter disposed in an optical path of light incident on the image sensor, an analog-to-digital (A/D) converter configured to convert an analog signal read out of the image sensor into a digital signal representative of the analog signal, and processor configured to output a decoded message data corresponding to the decodable indicia by processing the digital signal.
Claims25
A decodable indicia reading terminal comprising:
- a housing including a housing window;
- a multiple pixel image sensor disposed within said housing;
- an imaging lens configured to focus an image of decodable indicia on said image sensor;
- an optical bandpass filter disposed in an optical path of light incident on said multiple pixel image sensor, said optical bandpass filter configured so that light incident on each pixel of said multiple pixel image sensor passes through said optical bandpass filter and is subject to bandpass filtering by said optical bandpass filter in common wavelength ranges, said optical bandpass filter configured to pass light of two or more selected ranges of wavelengths and to attenuate light of wavelengths outside of said two or more selected ranges of wavelengths;
- an analog-to-digital (ND) converter configured to convert an analog signal read out of said image sensor into a digital signal representative of said analog signal, said analog signal representative of light incident on said image sensor;
- and
- a processor configured to output a decoded message data corresponding to said decodable indicia by processing said digital signal.
The optical indicia reading terminal of claim, 1 further comprising one or more illumination LEDs having different spectral characteristics, said one or more illumination LEDs configured to illuminate a substrate bearing decodable indicia.
Dependencies are inferred from the claim text.