Resources Contact Us Home
Optical disc and manufacturing method for the same

Image Number 13 for United States Patent #6700862.

The width and/or depth of guide grooves on the disc substrate surface are changed in each data recording layer and the guide groove depth of the recording film layer is appropriately shaped in each data recording layer to provide a high density, high recording capacity optical disc. The optical disc has plural substrate layers each having plural guide grooves; plural data recording layers laminated on the substrate layers, each of the plural data recording layers having a recording film for recording data over the guide grooves; and an intermediate layer between the plural data recording layers. The guide groove width is different on each substrate layer. The guide grooves of the data recording layers formed according to the guide grooves of the substrate layer have the same pitch in each data recording layer.

  Recently Added Patents
Techniques for determining optimized local repair paths
Generating a representation of an object of interest
Determination method for a reinitialization of a temporal sequence of fluoroscopic images of an examination region of an examination object
File management apparatus and file management apparatus controlling method
Semiconductor device including insulating layer of cubic system or tetragonal system
Pickup device and method for manufacturing the same
  Randomly Featured Patents
Process for the stabilization of sodium percarbonate
Antifuse structures, methods, and applications
Apparatus and method for cooling nozzles
Methods for manufacturing a golf ball
Device and methods for inspecting soldered connections
Rose plant
Bundles of fibers useful for moving liquids at high fluxes and acquisition/distribution structures that use the bundles
Method and apparatus for positioning workpiece to pallet in working line
Method of manufacturing semiconductor device
Method of making a high gasoline permeation resistant plastic container