Multistage storage CD read and write system based on phase changing material
Title:
Multistage storage CD read and write system based on phase changing material
Application Number:
01139829
Application Date:
2001/11/30
Announcement Date:
2002/06/05
Pub. Date:
Publication Number:
1352454
Announcement Number:
1142546
Grant Date:
Granted Pub. Date:
2004-3-17
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
G11B 7/00, G11B 7/09
Applicant(s):
Qinghua Univ.
Inventor(s):
Xu Duanyi, She Peng, Liu Rong
Key Words:
Multistage, storage CD, read and write system, phase changing material
Abstract:
The invention relates to a reading/wriing system for multi-stage optical storage disc. It includes writing light path along longitudinal direction, reading path along transverse direction, a set for detecting phase directly located above spectroscope, and multi-stages optical disc. The writing light path is from writing laser, collimating lens, spectroscope to converging lens. The reading light path is from reading laser, collimating lens, spectroscope, WoIastoh prism, to spectroscope and converging lens in the writing light path. The writing and reading lasers are located on the flocal point of relevant spectroscopes. The direct phase detecting set consists of spectroscope, then in I optical path: 1/4 wae plate, half-wave plate, polarized spectroscope; and in II optical path; middle density filter of reflector, half-wave plate, polarized spectroscope. The end of optical path is a photoelectric detector that receives a beams of light. The invented system provides capacities to realize high density of storage and high data transferring rate with simple structure.
Claim:
Priority:
PCT:
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