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
Method and system for establishing enhanced key when terminal moves to enhanced universal terminal radio access network (UTRAN)
Sporting goal practice screen
Financial transaction cards
Reference circuit with curvature correction using additional complementary to temperature component
Polishing composition
Method and system for implementing power detection
Crystalline form of zofenopril calcium
  Randomly Featured Patents
Device for the melting and measured discharge of a thermoplastic adhesive material
Ion source assembly for ion implantation apparatus and a method of generating ions therein
Caulking guide and reinforcing tip
Method of removing volatile matters from vent arrangement
Method for measuring and determining a rotation angle of a rotating object
Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining
Active piezoelectric damper for a snow ski or snowboard
Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner
GPS gyro calibration
Method for controlling access to data by redirecting modifications of the data