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
Flame-protected impact-modified polycarbonate compositions
Load balancing in shortest-path-bridging networks
Data encoding and decoding apparatus and method thereof for verifying data integrity
Highly stable electrolytic water with reduced NMR half line width
Computer-implemented method of constructing a stock index using index rotation
Method and apparatus for organizing segments of media assets and determining relevance of segments to a query
Large carrying case
  Randomly Featured Patents
Method of analysis of a mixture of biological and/or chemical components with the use magnetic particles and apparatus for its embodiment
Carbon--carbon composites containing poorly graphitizing pitch as a binder and/or impregnant
Tetrahedral windmill
Levelling device for producing a smooth surface
Method and apparatus for DMA window display
Method and apparatus for providing a uniform coating thickness along an axial direction within a substrate tube
Treatment of spent cracking catalysts
Process for screening substances having a modulating effect on an interleukin-5 receptor mediated cellular signal transmission pathway
Pipetting aid
Cyclonic distillation tower for waste oil rerefining process