초록 ▼

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

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.

대표청구항 ▼

A portable code symbol scanner comprising: a light source for producing a light beam, means for scanning said light beam along a path transverse to an optical axis of said scanner, a window, mounted at Brewster\s angle with respect to said optical axis, for transmitting therethrough said light beam

A portable code symbol scanner comprising: a light source for producing a light beam, means for scanning said light beam along a path transverse to an optical axis of said scanner, a window, mounted at Brewster\s angle with respect to said optical axis, for transmitting therethrough said light beam to and from said code symbol, and a polarizer positioned to filter said light beam returning from said code symbol and transmitted through said window.