Patent ID: 6854655

Claim:
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.