Resources Contact Us Home
Eccentricity control device

Image Number 3 for United States Patent #4365324.

Eccentricity control apparatus is provided in a system for optically recording and reading information on a rotating disc medium. The information may be recorded on concentric or spiral tracks. The eccentricity control apparatus includes a detector for detecting track crossings as an optical scanning head scans the disc surface. The detector provides pulses representative of track crossings. The number of pulses in a once-around is representative of the amplitude of an eccentricity control signal. The angle measured between a once-around pulse and a minimum pulse rate of the track crossings indicates the phase of the error. An eccentricity error signal which is generated by suitable circuitry is applied to affect the manner in which the optical scanning head scans the disc surface such that number of track crossings is reduced.

  Recently Added Patents
Hair care composition
Method and apparatus for allocating erasure coded data to disk storage
System for collecting computer application usage data of targeted application programs executed on a plurality of client devices
Method for detecting motion of an electrical device or apparatus
Channel marking for chip mark overflow and calibration errors
Seat post having a non-uniform cross-section
  Randomly Featured Patents
Method and device for length measurement of packaging webs
Method of restoring normal moisture level to hair with severe moisture deficiency
Supply voltage regulation system for transmission lines
Monitoring concept in a control device
Adhesive composition for electrical PTC heating device
Needle guard and capped needle guard and guarded winged needle assembly
Carrying system, substrate treating device, and carrying method
Attachment plate for top-tightening clamp assembly in a spinal fixation system