Resources Contact Us Home
Hand held optical scanner for omni-font character recognition

Image Number 3 for United States Patent #4793812.

A high resolution hand held scanner is disclosed for use with a character recognizing and voice synthesizing reading machine for the blind or print handicapped people. The components for scanning swaths of printed text from single sheets or bound pages of bound volumes are housed in an elongated, dust-tight carriage. A broad roller is rotatably mounted on one edge of the carriage and a split roller is rotatably mounted on an opposite edge. The roller axes are coplanar and parallel with each other, so that when the carriage is manually moved across a page to be scanned, a window in the carriage floor is maintained a predetermined distance therefrom and the rollers guide the carriage in a substantially straight line without need of guide rails. A strobed LED array provides the illumination for a 1728 element per inch CCD array via a Selfoc.RTM. lens. Each four CCD elements are summed to synthesize over 400 pixels per inch resolution scanning, with each synthesized pixel having increased light gathering ability. A rotary encoder is belt coupled to the split roller to provide speed and scanning direction signals. Circuitry is provided for processing the CCD array output signals in accordance with the rotary encoder signals.

  Recently Added Patents
Storage apparatus and method including page discard processing for primary and secondary volumes configured as a copy pair
Reverse mapping method and apparatus for form filling
Detecting patterns of abuse in a virtual environment
Systems and methods for electronic verification of vehicle insurance coverage
Spectral measurement device
Artificial engine sound control unit, approaching vehicle audible system, and electric vehicle having them
Curable inks comprising surfactant-coated magnetic nanoparticles
  Randomly Featured Patents
Laser oscillation apparatus
Siloxane block copolymers having linked siloxane blocks
Picture quality improvement device and picture quality improvement method
Fire resistant conduit insert for optical fiber cable
Stator having selectively applied thermal conductivity coating
High energy-density N.sub.2 O.sub.2 compound
Macroreticular itaconic acid ion exchange resin and process for its preparation
System and method for coordinating access to data for a distributed application
High bandwidth data transport system
Bank building structure