Laser code symbol scanner employing optical filtering system hav

Details Laser code symbol scanner employing optical filtering system hav Laser code symbol scanner employing optical filtering system hav

1997-04-24

1998-08-04

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235462, G06K 710

Patent

active

057897310

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.

REFERENCES:
patent: 5340973 (1994-08-01), Knowles et al.
patent: 5468948 (1995-11-01), Knowles et al.
patent: 5468949 (1995-11-01), Swartz et al.
patent: 5468951 (1995-11-01), Knowles et al.
patent: 5484992 (1996-01-01), Wilz et al.
patent: 5525789 (1996-06-01), Rockstein et al.
patent: 5528024 (1996-06-01), Rockstein et al.
patent: 5616908 (1997-04-01), Wilz et al.
patent: 5627359 (1997-05-01), Amundsen et al.
patent: 5661292 (1997-08-01), Knowles et al.

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