Resources Contact Us Home
Optical information processing apparatus in which the output of an optical sensor is replaced by a reference signal during the occurrence of malfunction

Image Number 3 for United States Patent #5151888.

An optical information processing apparatus effects recording and/or reproduction of information by scanning information tracks of an optical recording medium by at least one condensed light beam while effecting tracking and/or focusing control. The apparatus comprises at least two groups of optical sensors for receiving the light of the light beam reflected. By the medium, a circuit for producing a signal for effecting the control from the output of each of the groups of optical sensors, a reference signal generating source, and a switching circuit for causing, when at least one of the outputs of the groups of optical sensors exhibits an abnormal value, the reference signal, instead of the at least one output, to be input to the control signal producing circuit.

  Recently Added Patents
Semiconductor film, method for manufacturing the same, and power storage device
Systems and methods for location sensitive alerts in a mobile communication network
Automatic club setting and ball flight optimization
Brake booster having atmosphere chamber void of springs
Transfer tray
System and method for dynamic channel management of a television based on media center set-top box tuner availability
  Randomly Featured Patents
Asbestos abatement knife
System and method for power distribution
Sound attentuator
Apparatus and method for collecting blood from an umbilical cord
Process for the sulfonation of an elastomeric polymer
Child's rocker
Multivesicular liposomes with controlled release of encapsulated biologically active substances
Automatic squeezee pressing device
Succinamic acid compound, production method thereof and use thereof
System and method for extended enterprise planning across a supply chain