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
Computer systems and methods for the query and visualization of multidimensional databases
Imaging device
Device for accurately measuring concentration of component in blood and control method of the device
Methods of reverse link power control
Soybean cultivar CL0911610
Dot templates for object detection in images
Ion implantation method and ion implantation apparatus
  Randomly Featured Patents
Restricted multimedia episode distribution with synthetically generated random outcomes to players with intra-episode biometric image based authentication
Collision monitoring system
Electronic camera
Headrest armature for seats
Combination double screw rotor assembly
Optimal wiring configuration for magnetic recording elements
Spark plug
Coating method of amorphous type titanium peroxide
Substrate cooling system and method
Variable force solenoid hydraulic control valve