Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-07-25
2009-11-03
Edun, Muhammad N. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044250, C369S044280, C369S053190
Reexamination Certificate
active
07613083
ABSTRACT:
An optical scanning device for scanning a record carrier (22), the record carrier has an outer face (24) and the optical scanning device comprises a radiation source system (2) arranged to generate a radiation beam; an objective system (20) having an exit face (76) and which is arranged between the radiation source system and the record carrier and provides for evanescent coupling of the radiation across a gap between the exit face of the objective system and the outer face of the record carrier; and a radiation detector arrangement for detecting radiation after interaction with the record carrier. The radiation detector arrangement is arranged to produce a tilt error signals (α, β) representing a tilt misalignment between the exit face of the objective system and the outer face of the record carrier. The radiation detector arrangement is arranged to produce the tilt error signal by detecting information in the radiation which is indicative of a variation in efficiency off the evanescent coupling across the exit face.
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T. Ishimoto et al; “High Density Near Field Readout Over 50GB Capacity Using a Solid Immersion Lens With High Refractive Index”, Optical Disc Development Div. AV/IT Development Group, Sony Corp., Shinagawa-Ku, Tokyo, Japan, 2001.
Verschuren Coen Adrianus
Zijp Ferry
Edun Muhammad N.
Koninklijke Philips Electronics , N.V.
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