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
Passive translational velocity measurement from optical information
Reoccuring keying system
Stability control system with body-force-disturbance heading correction
People engine optimization
Data distribution unit for vehicle entertainment system
Converter and measuring apparatus
Method of manufacturing touch panel
  Randomly Featured Patents
Child holding device and joint therefor
Writing implement with carabiner
Internal roller tool for bending a strip into a tube
Liquid crystal display
Automatic switch for controlling electric appliances
Security lock and method for locking a laundry appliance
Water-resistant extrudable aqueous gel blasting agent and simplified method of manufacture
Apparatus for plugging a blast hole in an in situ oil shale retort or the like
Telescreen operating method
Method of calculating an optical system according to a given spectacle frame