BREWSTER WINDOW BAR CODE SCANNER

An optical scanner unit has a window which transmits light from inside the scanner to a target, for example, a bar code, and receives light from a target into the scanner. The window is tilted at Brewster's angle to permit light from inside the scanner to exit the scanner without "exit ref...

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Bibliographic Details
Main Authors BENTLEY, DANIEL, COLEMAN, EDWARD, PAUL, LAMANNA, VINCENT, T
Format Patent
LanguageEnglish
French
German
Published 28.02.1996
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:An optical scanner unit has a window which transmits light from inside the scanner to a target, for example, a bar code, and receives light from a target into the scanner. The window is tilted at Brewster's angle to permit light from inside the scanner to exit the scanner without "exit reflection" of light off the interior of the window. The window also permits light returned from the scanned target to enter the scanner and be sensed by a photodetector therein. The same window may be used for light transmitted to the photodetector and from the light source. The window is disposed at Brewster's angle relative to the scanning beam at the center of scan, and is close to Brewster's angle over the entire scan.
Bibliography:Application Number: EP19940917932