| 摘要 |
<p>The recognition of human and machine readable characters of a family of type of which each character comprises one or more constrained segments is enhanced by a single element shutter and light conducting and optical image rotating component in an opto-mechanical subassembly for precisely scanning short straight line segments in seriatim. The movable shutter is arranged with apertures in two parallel tracks moving past the field of scan and preferably the apertures are arranged for scanning a multiple of characters for each full movement of the shutter. The apertures for each character are divided into slits and slots with a slit in one track cooperating by way of the image rotating component with a slot in the other track moving in the direction of an image line segment under consideration. Drum, belt and disk shutters are contemplated, and plural image rotating elements and associated sets of aperture tracks are feasible with optical fiber bundles. A moving mirror illuminating and scanning system is also disclosed. Opto-electronic circuitry produces electric representations in response to the presence and absence of character line segments in the image. The basic opto-electronic circuitry comprises a photosensitive diode arranged to receive light from the scanning field of a document and suitable logical circuitry.</p> |
