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Hand-held dataform reader having multiple target area illumination sources for independent reading of superimposed dataforms

  • US 6,669,093 B1
  • Filed: 12/19/1997
  • Issued: 12/30/2003
  • Est. Priority Date: 12/19/1997
  • Status: Expired due to Term
First Claim
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1. A dataform reader for a portable data collection device, the dataform reader utilizing a single two dimensional imaging assembly adapted to independently image and decode first and second overlying dataforms, the first dataform being imaged when illuminated by illumination having a first wavelength and the second dataform being imaged when illuminated by illumination having a second wavelength, the first and second wavelengths being different, the dataform reader comprising:

  • a) the single two dimensional imaging assembly including a two dimensional photosensor array, the imaging assembly actuatable to generate a signal representative of an image of a target area of the imaging assembly, the target area image resulting from an illumination pattern received from the target area;

    b) the imaging assembly including signal and image processing circuitry for processing and decoding an image of a dataform positioned in the target area;

    c) an optic assembly positioned with respect to the imaging assembly to focus the reflected illumination from the target area onto the photosensor array;

    d) an illumination assembly including a first illumination source energizable to generate illumination having a first range of wavelengths and a second illumination source energizable to generate illumination having a second range of wavelengths, the first range of wavelengths including the first wavelength and not including the second wavelength and the second range of wavelengths including the second wavelength and not including the first wavelength, the first and second illumination sources being positioned to illuminate the target area when actuated;

    e) control and selection circuitry electrically coupled to the imaging assembly and the illumination assembly to actuate the imaging assembly and selectively energize the first illumination source to image and decode the first dataform and to actuate the imaging assembly and selectively energize the second illumination source to image and decode the second dataform;

    f) wherein the first illumination source illuminates the target area with illumination having a spectral output centered about a wavelength in the visible spectrum; and

    g) wherein the control and selection circuitry deenergizes the second illumination source while the first illumination source is energized and deenergizes the first illumination source while the second illumination source is energized.

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