Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Optical information recording and/or reproducing apparatus, optical information recording and/or reproducing method, optical information recording medium, and solid immersion lens










Image Number 4 for United States Patent #8130623.

An optical information recording and/or reproducing apparatus comprises: a focusing unit (11) which collects generated near-field light on an optical disc (1); a first detector (17) which receives light reflected by the optical disc (1) and outputs an electric signal according to the quantity of the received light; and a distance control circuit (22) which controls the distance between the focusing unit (11) and a light entrance surface of the optical disc (1), using the electric signal that is output from the first detector (17), and the optical disc (1) has at least N (N is an integer of 2 or greater) number of information layers, and a distance d0 from the light entrance surface to a first information layer which is most distant from the light entrance surface and a distance dn from the light entrance surface to an Nth information layer which is closest to the light entrance surface satisfy the relationship of dn.gtoreq.d0.times.(1/25). As a result, servo control can be accurately performed regardless which information layer, out of a plurality of information layers of an optical disc, information is recorded to or reproduced from.








 
 
  Recently Added Patents
Earphone
Wireless device with extendable antenna
Methods and devices for detecting and measuring environmental conditions in high performance device packages
Defect inspection method and device therefor
Portable stand
Luggage
Architectural panel with natural fossil spade leaf embossed surface
  Randomly Featured Patents
Display device and method for manufacturing the same
Methods of constructing buildings and building appurtenances
Method of controlling wireless communication system and wireless communication system
Method for highlighting selected tasks in a program code listing
Bleeder ball check valves in an automatic transmission
Tool
Method and apparatus for set associative cache tag error detection
Bar code scanner stand
Adapter for dry cell batteries
Length adjustable trigger assembly for nailer