Title: Mirror angle measurement and servo control apparatus for holographic digital data storage system
Application Number: 200410097930 Application Date: 2004.12.06
Publication Number: 1697037 Publication Date: 2005.11.16
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G11B7/0065;G03H1/04
Applicant(s) Name: Daewoo Electronics Corp. Address:
Inventor(s) Name: Jung Kyu-il
Attorney & Agent: wang yang
Abstract:
    A mirror angle measurement and a servo control apparatus for a Holographic Digital Data Storage (HDDS) system is disclosed. The mirror angle measurement apparatus includes a first mirror (110) having a first reflecting surface by which the reference beam is reflected toward the holographic medium (116), and a second reflecting surface (114) by which a control beam is reflected to adjust the incident angle of the reference beam; a transmission unit (122,124,126) for providing the control beam to the second reflecting surface; a second mirror (128) for returning the control beam to the second reflecting surface; and a photo detector (132) unit for detecting the amounts of the control beam. The angle of the first mirror is adjusted based on a comparison result between the amounts of the control beam detected by the photo detector unit.
Time: 6
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