Patent ID: 7173235
Filing Date: 2007-02-06
Classification: G06K

Abstract:
1. An apparatus for optically reading a target based on light reflected from the target, said apparatus comprising: a light source having a first optical axis and configured to emit light; an imaging optical system having a second optical axis and arranged so that the reflected light enters into the imaging optical system; a photodetector having an active area, said imaging optical system focusing the reflected light on the active area of the photodetector; a light guide member arranged between the target and the imaging optical system and disposed on the first and second optical axes, the light guide member being configured to guide the light emitted from the light source to irradiate the guided light to the target while preventing the guided light from leaking out from the light guide member; and an output plane arranged on the second optical axis and opposite the target, said output plane being inclined with respect to a direction orthogonal to the second optical axis at angle of θ