초록 ▼

An electro-optical triggerless reader reads indicia having parts of different light reflectivity within a limited working range of distances relative to the reader. A light beam is focused to have its minimum beam cross-section, as considered along a scan direction, or waist situated within a housin

An electro-optical triggerless reader reads indicia having parts of different light reflectivity within a limited working range of distances relative to the reader. A light beam is focused to have its minimum beam cross-section, as considered along a scan direction, or waist situated within a housing for the reader, thereby enabling the reader to read indicia located adjacent the reader housing.

대표청구항 ▼

[ We claim:] [1.] A triggerless reader for electro-optically reading coded indicia within a limited working range of distances relative to the reader, comprising:(a) a housing having an interior and an exit window;(b) a light source in the housing for emitting and directing a light beam along an opt

[ We claim:] [1.] A triggerless reader for electro-optically reading coded indicia within a limited working range of distances relative to the reader, comprising:(a) a housing having an interior and an exit window;(b) a light source in the housing for emitting and directing a light beam along an optical path through the window toward indicia to be read;(c) scanner means in the housing for scanning the light beam in a scan direction across the indicia; and(d) optical means in the housing for focusing the light beam to have a beam waist located within said interior of the housing, said beam waist having a minimum beam cross-section as considered along the scan direction, said beam waist being positioned in the optical path between the light source and the window to limit the working range by virtue of the distance traversed by the light beam within the housing.