OPTICAL READER

摘要

PURPOSE:To reduce the amount of noise component mixed into the reflection beam light by having the difference between a scan optical path reaching up to a surface to be scanned and a reflection optical path reaching up to a photoelectric transduser. CONSTITUTION:A beam condenser lens 8 is set between a scanning rotary polyhedral mirror 3 and a scan subject 5. The lens 8 has a function to focus the laser beam light onto a surface 5a to be scanned as well as a function to lead the laser beam light reflected on the surface 5a to a condenser rotary polyhedral mirror 4 approximately in the form of parallel luminous fluxes. Then both mirrors 3 and 4 are revolved by a motor 1 synchronously with each other. Thus the laser beam light reflected from the surface 5a illuminated by the laser beam can be condensed. Then the noise components due to a fact that no difference exists between the scan and reflection optical paths can be reduced since both optical paths are different from each other.