An optical disk (10) includes several tracks (21-23, 121-125) that each include a series of optical data elements (29, 39). Each optical data element includes several reflective surfaces (31-34, 41-44) with respective different orientations that represent stored information. A detection system (210) directs a beam from a laser (217) onto successive optical data elements. The multiple reflective surfaces of each optical data element produce multiple reflected sub-beams that are imaged onto respective portions of a detector (219, 501, 541). The position of each sub-beam on the corresponding portion of the detector is determined, to thereby identify the orientation of the corresponding reflective surface and thus the stored information represented by that surface.

Title
Mehod and apparatus for optical data storage
Application Number
10/076016
Publication Number
20030151998
Application Date
February 12, 2002
Publication Date
August 14, 2003
Inventor
Fred C Thomas
Ogden
UT, US
Agent
Baker Botts
TX, US
Agent
Jerry W Mills Esq
TX, US
IPC
G11B 07/05
View Original Source