Registers – Coded record sensors – Particular sensor structure
Patent
1995-05-11
1997-05-06
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235472, G06K 710
Patent
active
056273592
ABSTRACT:
A laser bar code symbol scanner embodying a narrow band-pass optical filtering system of novel construction. A first optical filter element is installed over the light transmission aperture of the scanner housing, and has wavelength selective properties which transmit only light having wavelengths from slightly below a predetermined wavelength in the visible band of the electromagnetic spectrum (e.g., greater than slightly below 670 nanometers). A second optical filter element is installed within the housing, along the focused laser return light path between the light focusing element and the light detecting element, and transmits only light having wavelengths from slightly above the predetermined wavelength (e.g., less than slightly above 670 nanometers). Collectively, the first and second optical filter elements cooperate to form a narrow wavelength band-pass filtering system centered about the predetermined wavelength, providing improved signal-to-noise ratio. As a result of the present invention, aesthetically unappealing electro-optical components mounted within the scanner housing are hidden from plain view, while the optical filtering elements of the system can be easily and inexpensively manufactures and used without compromising the signal-to-noise ratio performance of the laser scanner.
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Amundsen Thomas
Blake Robert
Knowles Carl H.
Rockstein George
Wilz, Sr. David
Hajec Donald T.
Metrologic Instruments Inc.
Minh Le Thien
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