Decodable indicia reading terminal with combined illumination

摘要

A decodable indicia reading terminal can comprise a laser-based scanner, an imager-based scanner, a central processing unit (CPU), and an illumination assembly. The laser-based scanner can include a laser source, a photo-detector, and an analog-to-digital (A/D) converter. The laser source can be configured to emit a laser beam onto a substrate bearing decodable indicia. The photo-detector can be configured to receive a beam of a variable intensity reflected by the decodable indicia, and to output a first analog signal representative of the variable intensity. The A/D converter can be configured to convert the first analog signal into a first digital signal. The imager-based scanner can include a multiple pixel image sensor, an imaging lens, and an A/D converter. The imaging lens can be configured to focus an image of the decodable indicia on the image sensor. The A/D converter can be configured to convert into a second digital signal a second analog signal read out of the image sensor and representative of light incident on the image sensor. The CPU can be configured to output a decoded message data corresponding to the decodable indicia by processing the first digital signal and/or the second digital signal. The illumination assembly can include an indicator light bar and an illumination light bar. The ON/OFF state and color of the indicator light bar can reflect the state of the decodable indicia reading terminal. The illumination light bar can be configured to generate a high intensity illumination for illuminating the substrate bearing the decodable indicia. The wavelength of the light generated by the indicator light bar can be substantially equal to the wavelength of the light generated by the illumination light bar, and the light generated by the illumination light bar can have a very low perceived intensity.

主权项

1. A decodable indicia reading terminal comprising:
a laser-based scanner disposed within a housing, said decodable indicia reading terminal defining a horizontal surface, said laser-based scanner including a laser source configured to emit a laser beam onto a substrate bearing decodable indicia, a photo-detector configured to receive a second beam of a variable intensity reflected by said decodable indicia and to output a first analog signal representative of said variable intensity, and a first analog-to-digital (A/D) converter configured to convert said first analog signal into a first digital signal representative of said first analog signal; an imager-based scanner disposed within said housing, said imager-based scanner including a multiple pixel image sensor, an imaging lens configured to focus an image of said decodable indicia on said image sensor, and a second A/D converter configured to convert into a second digital signal a second analog signal read out of said image sensor, said second analog signal representative of light incident on said image sensor, said second digital signal representative of said second analog signal; a central processing unit (CPU) configured to output a decoded message data corresponding to said decodable indicia by processing at least one of: said first digital signal, said second digital signal; an illumination assembly including an indicator light bar configured to emit first light having a first wavelength, and an illumination light bar configured for illuminating said substrate, by emitting second light having a second wavelength; wherein the decodable indicia reading terminal is configured so that the indicator light bar is capable of being in an on state with the illumination bar being in an off state; wherein said first wavelength is substantially equal to said second wavelength; wherein the decodable indicia reading terminal includes optics for diffusing said first light; and wherein the indicator light bar is located spatially close to the illumination light bar such that the indicator light bar camouflages the illumination light bar.