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
Digital display
Method of analyzing cell structures and their components
Idle stop and go system and method for controlling thereof
Temporary protective cover for an exposed junction box
Method for cutting C--Mn steel with a fiber laser
Radiation-emitting semiconductor chip and method for producing a radiation-emitting semiconductor chip
Resonant conversion system with over-current protection processes
  Randomly Featured Patents
Anti-theft method for detecting the unauthorized opening of containers and baggage
Golf ball
Method of seismic exploration for penetrating diffraction barriers and/or surveying beneath obstacles
Process for the preparation of detergent dispersants of high alkalinity for lubricating oils and the product obtained therefrom
Process cartridge, electrophotographic photosensitive drum, electrophotographic image forming apparatus and color electrophotographic image forming apparatus
Tube shield
Two row buffer image compression (TROBIC)
Polybenzimidazole compounds, polymeric media, and methods of post-polymerization modifications
Apparatus and method for repairing a pipeline
Method and apparatus for installing a sensor array