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
Drinking glass with ball embedded in base
Electronic device and recording medium
System and method for multi-threaded MIMO OFDM channel equalizer
Developing device
Automotive lighting system
Utility knife
  Randomly Featured Patents
Coolant flow control apparatus for rotating heat exchangers with supercritical fluids
Metrics calculations utilizing pre-stored values
Substituted beta-ketoamide ACAT inhibitors
Method for recording/reproduction by recording/reproducing system for visual inspection device
Hair trimmer
Concrete beams and connecting means therefor
Method of metathesis of alkanes and catalyst
Sim card connector
Human GABA receptor proteins and polynucleotides encoding the same
Sensor module, method of correction therefor, and mobile object including the sensor module