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
Access control method, information display device using the same, and information display system
Bio-pesticide and method for pest control
Refuelable battery-powered electric vehicle
Haloalky -substituted amides as insecticides and acaricides
Audio conversation apparatus
System, method, and computer readable medium for a force-based wheelchair joystick
Managing breakpoints in a multi-threaded environment
  Randomly Featured Patents
Three-dimensional word construction game of SCRABBLE
Ceiling dome
Child safety straw
Compressor and compressor housing
Components feeding apparatus
Semi-frozen food product carbonator
Bench press
Bag dispenser
Fuel injection device for an internal combustion engine
Apparatus for determining the position of a piston in a fluidic actuator