Automatic focusing and path tracking device and method for double photon three dimension disc type storage |
Title： |
| Automatic focusing and path tracking device and method for double photon three dimension disc type storage |
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Application Number： |
200510011853 |
Application Date： |
2005/06/03 |
Announcement Date： |
2006/01/04 |
Pub. Date： |
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Publication Number： |
1716394 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
G11B 7/0045, G11B 7/005, G11B 7/09, G11B 7/00 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Xu Duanyi, Yuan Haibo, Zhang Qicheng |
Key Words： |
double photon, three dimension, disc type storage, automatic focusing, path tracking |
Abstract： |
The present invention relates to automatic focusing and path tracking device and method in 3D double photon disc type storage and belongs to the field of 3D digital light storage. The device contains mainly disc type double photon storage, write-in laser, read-out laser, specially designed lens with inner ring focus length slightly smaller than the outer ring focus length, automatic focusing control system, automatic path tracking control system, and confocal read-out system. During reading out data, the outer ring of the lens focuses the reading-out light onto the read-out data layer for focusing, path tracking and reading out data. During writing in data, the outer ring of the lens focuses the reading-out light onto the uppermost record layer with recorded data for focusing and path tracking, while the inner ring of the lens focuses the writing-in light onto the upper layer for writing in data. The device of the present invention has high control precision, simple structure, low cost, easy integration and other advantages. |
Claim： |
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Priority： |
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PCT： |
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