Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Transferring a document
Power-saving receiver
Method and apparatus for increasing query traffic to a web site
High productivity single pass scanning system
Multi charged particle beam writing apparatus and multi charged particle beam writing method
Lens driving device
Maize variety X00C175
  Randomly Featured Patents
Process for the synthesis of 1,3-diols
Lens and associatable flow cell
Control apparatus for operation panel and electronic apparatus
Extended precision accumulator
Modified oligonucleotides and applications thereof
Lower plate of PDP and method for manufacturing the same
Methods of forming integrated circuitry and integrated circuitry
Interface accessory for use with an aerosol inhalation system
Cutting template for cutting meat pieces
Image forming apparatus and paper feeding method used with the same