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
Automatic parallelization using binary rewriting
Stimulation aid device
Electrophoretic display sheet and manufacturing method therefor
Data acquisition system
Sport trailer with deck
Active region patterning in double patterning processes
Scan test circuitry with delay defect bypass functionality
  Randomly Featured Patents
Transfer device and image forming apparatus
Methods and systems for selecting a low-cost internet base station (LCIB) for a macro-network-to-LCIB handoff of an active mobile station
Electrically heated catalytic converter for an engine
Conductivity modulated MOSFET
Method of detecting soot in engine oil using microwaves
Anamorphic prism for beam shaping
Production method of thermoelectric semiconductor alloy, thermoelectric conversion module and thermoelectric power generating device
Liquid crystal display
Secondary battery or cell with improved rechargeability