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
Dual work function recessed access device and methods of forming
Image forming apparatus
Generating agricultural information products using remote sensing
Techniques for determining optimized local repair paths
Method of allocating IP address of image forming apparatus using DHCP, image forming apparatus and system of allocating IP address using DHCP
Method of sheet alignment and method of post-processing comprising the same and method of image formation
Estimating optical characteristics of a camera component using sharpness sweep data
  Randomly Featured Patents
Press felt for paper making and a method of manufacturing such a felt
Multi-channel radiometer imaging system and MMIC chips for use thereof
Grain distributor
Method for blow molding containers
Device for female intermittent self-catheterization
Method for treating conditions related to the glutamate receptor using carboxylic acid amide derivatives
Exchangeable gun arm welding gun and gun arm exchange apparatus
Combined keyboard and mouse employing conventional typing keys
Wireless access point
Systems and methods for production of high pressure oxygen