A handheld reader for reading optical information such as a bar code contains a reading sensor. An image of the optical information is imaged by light reflected from the optical information, via a reflecting mirror, a lens and a diaphram member, onto the reading sensor so that the image is converted...http://www.google.fr/patents/US4900907?utm_source=gb-gplus-shareBrevet US4900907 - Optical information reading apparatus
