Optical path design for scanning assembly in compact bar code readers

摘要

A retroreflective optical scan module, for example in a bar code reader having a window, including a light source for directing a light beam to a symbol to be read, and an optical assembly including a light collecting portion which collects and redirects the light along an optical path to a sensor, wherein the optical axis of the light collecting portion is displaced from that of the emitted light beam so that emitted light partially reflected by the window of the reader does not illuminate the sensor.