Resources Contact Us Home
Absolute optical encoder system

Image Number 13 for United States Patent #4445110.

An optical code disc includes a fine track which provides a high resolution signal, at least one V scan natural binary track synchronized to the fine track by lead and lag detectors, and Gray code tracks which provide the most significant bits of the digital output of the encoder system. The number of circuit elements in the multiplier circuitry associated with the fine track are reduced by means of a quadrant switching technique whereby the sinusoidal inputs to the multiplier are repeated through each quadrant of the fine track cycle. The V scan and Gray code tracks are optically multiplexed to reduce the number of leads from the optical detector. The use of both V scan and Gray code tracks minimizes the number of detectors required in the system while maintaining large detector signals from each track. The V scan and Gray code outputs are synchronized by the use of an overlapping bit.

  Recently Added Patents
Method and system for automatically identifying wireless signal quality of a region
Method and apparatus for performing real time anomaly detection
Vehicle grille
Preserving privacy of digital communication information
Categorization of design rule errors
Active pulse blood constituent monitoring
Methods and compositions for improving photodynamic therapy through administration of lipids
  Randomly Featured Patents
Bottom anode for a metallurgical vessel
Cleaning appliance
Lamp unit
Fire extinguisher
Electrical connector system with power and command connectors
Liquid ejection head and liquid ejection apparatus
Coexistence mechanism for collocated WLAN and WWAN communication devices
Diffractive optical element and an optical system having a diffractive optical element
Tablet conveying apparatus and tablet cutting apparatus
Method, system and router providing active queue management in packet transmission systems