Patent ID: 6026201
Filing Date: 2000-02-15
Classification: G06K,H04N

Abstract:
An optical scanner having plural light receiving means to receive light reflected from an object to be read, of a light beam emitted from a light source that is deflected and radiated on the object to be read, to obtain image information corresponding to the information on the read object, wherein the plural light receiving means, comprise:detecting means for detecting the image information of the reflected light; andimaging means structured so that the beam diameter in the detecting means of the reflected light is larger than a beam diameter w.sub.0 expressed by the following expression:w.sub.0 =1.22.times.2l.sub.2 .lambda.)/W,.lambda.:Wavelength,W:Exit pupil diameter of imaging means,l.sub.2 :Image point position; andthe imaging means is an optical element having a principal plane, wherein the principal plane is substantially adjacent a surface of the optical element away from the read object.