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
Washing machine
Method for accessing wireless network
Implantable defibrillator systems and methods with mitigations for saturation avoidance and accommodation
Pipette device
Wireless monitoring in process applications
Transmitting a synchronizing signal in a packet network
Semiconductor device and method of forming interconnect structure with conductive pads having expanded interconnect surface area for enhanced interconnection properties
  Randomly Featured Patents
Ball throwing machine
Printing process using a plurality of drive signal types
Insecticidally-active water-in oil-out emulsions and insecticidally active compositions derived therefrom
Hand pump
Synthetic corn hybrid P67
Apparatus for applying a resin layer of varying width to a metal member of varying width
Nozzle for emitting nitrous oxide for fuel to engines
Disc cleaning machinery, disc cleaning device thereof and rotary brush thereof
Robot cleaner
Chimeric adenoviruses for use in cancer treatment