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
Bipolar transistor with diffused layer between deep trench sidewall and collector diffused layer
Resonant oscillator with start up and shut down circuitry
Actuators and moveable elements with position sensing
Bluetooth headset
Compounds for nonsense suppression and methods for their use
Method and apparatus for decoding/encoding a video signal with inter-view reference picture list construction
Method of measuring the flux of a soil gas
  Randomly Featured Patents
Circuit board device, wiring board interconnection method, and circuit board module device
Distance measuring apparatus and distance measuring method
Software process monitor
Ink ribbon cartridge
Positive displacement screw machine with separation wall attached to slide valve
Method, system and apparatus for automatic keyword extraction
Oxide material and sputtering target
Electronic component device with a Ni-Bi alloy sealing frame
Image forming apparatus with belt, plural sensitized bodies, and belt positioning mechanism
Device for improving the lubrication in a rotary coupling