Two window optical scanner
AssigneeSymbol Technologies, Inc.
InventorEdward Barkan
Life of this patent
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Abstract
The invention relates to a scanning device for reading bar code symbols, wherein the scanning device comprises a housing having a substantially horizontal surface and a substantially vertical surface. A motor rotates a polygon mirror, which reflects a light beam from a light source and redirects it toward a mirror array and out a window in the substantially horizontal window. Another motor rotates another polygon mirror, which reflects a light beam from a second light source and redirects it toward a second mirror array and out a window in the substantially vertical surface. A plurality of sensors detects light reflected back from a bar code and generates a plurality of electrical signals proportional to the intensity of the reflected light.
Claims16
A scanning device for reading bar code symbols comprising:
- a housing having a substantially horizontal surface with a substantially horizontal window and a substantially vertical surface having a substantially vertical window;
- a first rotatable polygon mirror and a first stationary mirror array;
- a first light source for generating a first light beam that reflects off said first polygon mirror to project a first plurality of scan lines through said substantially horizontal window;
- a rotatable second polygon mirror and a second stationary mirror array;
- a second light source for generating a second light beam that reflects off said second polygon mirror to project a second plurality of scan lines through said substantially vertical window;
- a plurality of sensors for detecting the intensity of light from the first and second plurality of scan lines reflected by a bar code symbol and for generating electrical signals proportional to the intensity of said reflected light;
- and
- an indicator for indicating that said substantially vertical window is to be used when a component related to said first light source fails and for indicating that said substantially horizontal window is to be used when a component related to said second light source fails.
A scanning device for reading bar code symbols comprising:
- a housing having a first surface with a first window and a second surface with a second window;
- first and second mirror assemblies respectively associated with the first and second windows;
- a first light source generating a first light beam that reflects off said first mirror assembly to project a first plurality of scan lines through said first window;
- a second light source generating a second light beam that reflects off said second mirror assembly to project a second plurality of scan lines through said second window;
- a plurality of sensors for detecting the intensity of light from the first and second plurality of scan lines reflected by a bar code symbol and for generating electrical signals proportional to the intensity of said reflected light;
- and
- an indicator for indicating that said second window is to be used when a component related to said first light source fails and for indicating that said first window is to be used when a component related to said second light source fails.
Dependencies are inferred from the claim text.