Resources Contact Us Home
Absolute optical encoder system

Image Number 12 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
Methods and apparatus for performing multiple photoresist layer development and etching processes
Control method and allocation structure for flash memory device
Neurostimulation system
Switching apparatus and controlling method thereof
Stack and folding-typed electrode assembly and method for preparation of the same
Diaminocyclohexane compounds and uses thereof
  Randomly Featured Patents
Solid-state imaging device having transimpedance amplifier
Redundant control relay circuits
Fluorescent indicator dyes for alkali metal cations
Filter medium and filter element
Displaying and analyzing document flows
Clamp back spacer for conduit
Multi-layer integrated circuit package
Foamable coupling for lamp assembly and methods for using the coupling
Track count estimator for optical storage drives