Resources Contact Us Home
Absolute optical encoder system

Image Number 2 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 parallelizing data copy in a distributed file system
Perception-based artifact quantification for volume rendering
Software self-checking systems and methods
Semiconductor memory device, method of controlling read preamble signal thereof, and data transmission method
Switching apparatus and controlling method thereof
Telephone line seizure module
Data distribution apparatus, data distribution method, and distribution control program
  Randomly Featured Patents
Clutch arrangement
Auger handle bar
Depth filter media
Potent thymopentin analogs
Expandable spinal spacer
Automated software updating and distribution
Method and device for controlling the broadcasting of audio contents by two loudspeakers
X-ray CT scanner capable of performing improved log conversion
Fuel injection device for internal combustion engines
Two degree-of-freedom spherical orienting device