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
Lighting elements
Panel for decoration
Document-related representative information
System and method of verification of analog circuits
Optical scanner and image-forming device
Difference detecting apparatus, difference output apparatus, and medium
Predicting popularity of electronic publications
  Randomly Featured Patents
Method and apparatus for measuring heat flow
Bandpass filter
Configuring a capacitor with enhanced pulse reliability
Apparatus for heating or cooling drinks
Electric-powered vehicle, method for estimating state of charge, and computer-readable storage medium having program stored therein for causing computer to execute method for estimating state
Laser system with phase-conjugator-enhanced output
Selectable diode bias for power amplifier control in a wireless telephone handset
Mooring whip base
Method and instrument for microscopy
Organic EL display device