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
Using encapsulation to enable 802.1 bridging across 802.11 links
LED backlight driving circuit, liquid crystal display device and driving circuit
SIMD integer addition including mathematical operation on masks
Clock signal generation apparatus for use in semiconductor memory device and its method
Nucleating agent for lithium nitrate trihydrate thermal energy storage medium
Interworking function for communication networks
Multiple upstream channel descriptor messages pointing to single upstream channel ID for more efficient operation of a DOCSIS system
  Randomly Featured Patents
Right angle transfer apparatus with enabling and disabling means
Slider window frame component
Air bag apparatus
Non-soft tissue repair
2,6-methano-1,3-benzodiazocine compounds which have useful pharmaceutical utility
Method of and apparatus for the testing of warning systems
Methods and systems for preparing extensible markup language (XML) documents and for responding to XML requests
Method and apparatus for detecting microorganisms
Suspended luminaire
Frequency agile electrically small tactical AM broadcast band antenna system