Hand-mounted optical scanner system
First Claim
1. 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, anda polarizer positioned to filter said light beam returning from said code symbol and transmitted through said window.
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Accused Products
Abstract
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.
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Citations
10 Claims
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1. A portable code symbol scanner comprising:
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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.
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- 2. The system according to claim one further including a housing having said window mounted in the front thereof and spring finger means inside groove means in said housing to slidably retain an optical assembly printed circuit board therein.
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5. A portable hand-mounted scanner unit for scanning an optical beam across a symbol when pointed toward the symbol for reading data represented by the symbol in response to light returned to said unit which comprises:
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optical assembly means including a polarized light source for producing the optical beam and means for scanning the beam along a path across the symbol, a photodetector illuminated by said return light, a polarizer positioned in front of said photodetector, and a window which is disposed at Brewster'"'"'s angle as measured from an optical axis of said optical assembly means, said optical beam being substantially totally transmitted without substantial decrease in intensity at said window, such that the scanning beam going out is effectively totally transmitted out said window.
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Specification