Patent ID: 7054259
Filing Date: 2006-05-30
Classification: B82Y,G11B,Y10T

Abstract:
1. An optical data storage system for writing and/or reading information with respect to an optical storage medium, the optical data storage system comprising: first and second optical pickups respectively including focusing optical systems generating near fields and emitting light beams to write and/or read the information; and the optical storage medium including a single optical storage medium including a first optical transmissive layer having a first surface opposing said first optical pickup, a second optical transmissive layer having a first surface opposing said second optical pickup, and first and second recording layers which are respectively positioned in second surfaces of said first and second optical transmissive layers which are opposite the corresponding first surfaces, wherein said first and second optical transmissive layers each have a thickness larger than one wavelength of the light beams and the distances between the first surfaces of said first and second optical transmissive layers and respective opposing surfaces of the focusing optical systems are smaller than the one wavelength of the light beams.