Linear actuator based lens positioning system

摘要

The present invention relates to a scanner for reading barcode symbologies having a focusing illuminating source. The invention uses a coherent light source for illuminating the coded symbol during a scan and a detecting means for collecting the reflected light energy from the coded symbol. Both the illuminating and collecting means include lenses which are in variable spacial relationship with each other. The invention varies the relationship between the light source and associated focusing lens to provide the narrowest focused beam at the barcode location. <IMAGE>