Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-06-26
2000-11-21
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
06151280&
ABSTRACT:
A focus jump control apparatus of a player for playing a multilayer recording disc surely achieves a focus jump. This apparatus includes: a focusing servo loop for allowing a focal point to trace a recording surface in accordance with a focusing error signal by using a focusing actuator to displace the focal point of read light to a disc in the optical axial direction; and a tracking servo loop for allowing the focal point to trace disc tracks. A loop opening/closing control unit opens/closes focusing/tracking servo loops in response to an instruction and closes the focusing servo loop when the movement of the focal point from one of the recording surfaces to the other. During the movement of the read light focal point, the closing state of the tracking servo loop is maintained. Jump driving means generates a drive signal of the actuator to move the focal point from one of the recording surfaces to the other based on the error signal under the opening/closing control of the focusing/tracking servo loops.
REFERENCES:
patent: 5740136 (1998-04-01), Tsutsui et al.
patent: 5754507 (1998-05-01), Nishikata
patent: 5835460 (1998-11-01), Nishikata
patent: 5903530 (1999-05-01), Tateishi et al.
patent: 5966355 (1999-10-01), Kamiyama
Bradshaw Alex
Kawana Kazushige
Kimura Motoi
Matsuda Norio
Naohara Shinichi
Pioneer Electronic Corporation
Psitos Aristotelis M.
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