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
Organic light-emitting display and method of manufacturing the same
Semiconductor thin film, thin film transistor, method for manufacturing same, and manufacturing equipment of semiconductor thin film
Lubricating oil compositions
Probe for ultrasound diagnostic apparatus
Integrated circuit testing with power collapsed
Radiation-curable ink composition, ink jet recording method, and recorded matter
(Meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding them
  Randomly Featured Patents
Tire tread
Positioning apparatus, exposure apparatus, and device manufacturing method
Indazole compounds
Optical fiber closure with sealed cable entry ports
Electronic typewriter including right margin adjusting means
Brassica INDEHISCENT1 sequences
Adjustable lateral thoracic support for a solid back of a wheelchair
Method for updating encryption key information in communication units
Massage chair
Communication method and apparatus therefor