Mark reader

摘要

An optical scanning device comprising: a housing; a scanner, disposed in the housing, selectively producing a first scan pattern, and a second scan pattern different from the first scan pattern; a sensor detecting whether the housing is positioned on a surface; and a controller disposed in the housing to control the scanner to produce the first scan pattern when the sensor detects that the housing is positioned on the surface and to produce the second scan pattern when the sensor detects that the housing is not positioned on the surface. <IMAGE>