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.
Claims20
An apparatus comprising:
- an image sensor configured to output a signal representative of incident on the image sensor via an optical path;
- an optical bandpass filter disposed in the image sensor's optical path so that light incident on the image sensor passes through the optical bandpass filter and is subject to bandpass filtering by the optical bandpass filter in common wavelength ranges, the optical bandpass filter configured for passing of two or more selected wavelength ranges and for attenuating light having a wavelength outside the two or more selected wavelength ranges.
An apparatus comprising:
- an image sensor configured to output a signal representative of light incident on the image sensor via an optical path;
- a housing window disposed in the image sensor's optical path;
- an imaging lens for focusing light onto the image sensor, the imaging lens being disposed in the image sensor's optical path between the housing window and the image sensor;
- an optical bandpass filter disposed in the image sensor's optical path so that light incident on the image sensor passes through the optical bandpass filter and is subject to bandpass filtering by the optical bandpass filter in common wavelength ranges, the optical bandpass filter configured for passing light of two or more selected wavelength ranges and for attenuating light having a wavelength outside the two or more selected wavelength ranges.
The apparatus of claim ii, wherein the optical bandpass filter is disposed between the imaging lens and the image sensor.
The apparatus of claim wherein the optical bandpass filter is built into the imaging lens.
An apparatus comprising:
- an image sensor having afield of view, the image sensor being configured to output a signal representative of light incident on the image sensor via an optical path;
- an optical bandpass filter disposed in the image sensor's optical path so that light incident on the image sensor passes through the optical bandpass filter and is subject to bandpass filtering by the optical bandpass filter in common wavelength ranges, the optical bandpass filter configured for passing light of two or more selected wavelength ranges and for attenuating light having a wavelength outside the two or more selected wavelength ranges;
- an illumination assembly for generating an illumination pattern substantially corresponding to the field of view of the image sensor.
Dependencies are inferred from the claim text.