Patent ID: 6435411
Filing Date: 2002-08-20
Classification: G06K

Abstract:
An optoelectronic device for acquisition of images of objects, comprising:a case having a reading window; an electronic scanning sensor received within the case; lighting means received within the case; and optical means including at least a lens received within the case which permit the formation of images on the sensor, wherein the sensor and the optical means define an optical axis, relative to which the reading window is centred; the sensor, reading window and the optical means delimit a useful optical reading field, which is subtended by an optical angle; the lighting means being positioned between the optical means and the reading window, and disposed such that an axis of a light beam from the lighting means intersects the optical axis; and reflection means allowing an image beam to pass through, and reflecting the light beam, being disposed such as to intercept the light beam; the reflection means being inclined relative to the optical axis, by an angle which is such that, after reflection, the light beam is centred on the optical axis; the reflection means, lighting means and lens being disposed such that the distance between the object and the lens is substantially identical to the distance between the object and the lighting means, wherein, in the optoelectronic device: the lighting means comprise a lighting source which is designed to light the useful optical field throughout the entire depth of the field; an angle a from which the lighting source is seen from an object plane, is such that Î±&leq;Arc&it;â€ƒ&it;tg&it;L5&it;P,in which L=width of the object plane, and P=the distance between the object and the lighting source.