A bar-code reader is easy to use and has an optical system that is easy to position and replace. The bar-code reader is used for a POS system. The bar code reader has a laser source for emitting a laser beam, a scan unit for scanning a bar code with the laser beam according to a predetermined scanning...http://www.google.es/patents/US6142378?utm_source=gb-gplus-sharePatente US6142378 - Replaceable emission-condensing unit for a bar code reader
Replaceable emission-condensing unit for a bar code reader
