Patent ID: 6752315
Filing Date: 2004-06-22
Classification: G06K,H01L

Abstract:
A detector assembly for creating a scanner signal in response to light reflected from a scan pattern by a bar code, the scan pattern consisting of light having a defined wavelength, comprising:a light sensitive detector operative to generate a signal in response to light striking the detector; a capsule surrounding the detector, the capsule being formed of a material providing an optical filtering effect so as to admit light having a wavelength in a range bounded by a predetermined value, with the predetermined value being based on the wavelength of the light making up the scan pattern and chosen to allow admission of light within a range including the wavelength of the light making up the scan pattern; and a coating on a portion of the capsule, the coating being formed of a material providing an optical filtering effect so as to admit light having a wavelength within a range bounded by a predetermined value, with the predetermined value being based on the wavelength of the light making up the scan pattern and chosen to admit light within a range including the wavelength of the light making up the scan pattern, the filtering effect of the coating being complementary to that provided by the material forming the capsule such that the combined filtering effects of the coating and the material provided by the capsule create a bandpass filtering effect admitting light within a range of wavelengths bounded by the predetermined values defining wavelengths of light admitted by the coating material and the material forming the capsule.