Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-11-13
1997-04-22
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
056234635
ABSTRACT:
A method for determining a focusing control position in an opto-magnetic disc recording/reproducing apparatus, shortens the focusing time required for determining the focusing control position of an objective lens. When a focusing detecting signal and a focus zero crossing signal are received into a control section as many as the prescribed times while the objective lens ascends to perform an operation for determining the focusing control position, the ascending operation of the objective lens in not further carried out in the current position, but a descending operation is performed to execute the focusing control operation with respect to a reflective layer included in the opto-magnetic disc. The time required for determining the focusing control position is reduced to improve the degradation of a characteristic of a focusing coil caused by a frequent supply of focusing control current.
REFERENCES:
patent: 4700056 (1987-10-01), Silvy et al.
patent: 5086420 (1992-02-01), Doi
patent: 5414682 (1995-05-01), Iida
patent: 5499231 (1996-03-01), Fennema et al.
Daewoo Electronics Co. Ltd.
Hindi Nabil
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