Resources Contact Us Home
Focusing control method for reading/writing optical disc

Image Number 6 for United States Patent #7847812.

A label pattern can be created on a label side of an optical disc under well focus control. An optical disc is first loaded in an optical disc drive with the label side thereof facing to an optical head of the optical disc drive. Then, the optical head is actuated along a focusing direction. Meanwhile, a light intensity addition signal is generated in response to optical signals reflected from the optical disc and received by the optical head. A closed-loop control operation of the optical head is performed according to the light intensity addition signal after the light intensity addition signal up-crosses a threshold. Then, a label pattern can be defined on the label side of the optical disc with the closed-loop control operation.

  Recently Added Patents
Vehicle grille
System for and method of providing single sign-on (SSO) capability in an application publishing environment
Multi-user remote health monitoring system with biometrics support
Lacrosse head
Method for cutting C--Mn steel with a fiber laser
Low power voltage controlled oscillator (VCO)
Solid-state imaging device, method for manufacturing solid-state imaging device, and electronic apparatus
  Randomly Featured Patents
Power-driven electrical hand tool
Apparatus for reading optical data from a motion picture film and a light source therefor
Oxoalkyl esters
Method for determining the power of a test specimen and power test bench for the test specimen
System and method for secure peer-to-peer communication between downloaded programs
Method of manufacturing a semiconductor device with a fast bipolar transistor
Separating contaminants from continuous from surface cleansing solution during continuous strip steel processing
System for enhancing cornering performance of a vehicle equipped with a stability control system
Thermal air flowmeter
Pseudo-random sequence generator arrangement