Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-06-22
2000-07-18
Huber, Paul W.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4427, 369 94, G11B 700
Patent
active
06091680&
ABSTRACT:
Disclosed is a focus control apparatus of the present invention capable of successfully performing an accurate focus jump operation without an erroneous operation of a focus actuator. The apparatus irradiates a light beam onto a recording medium, and generates a focus actuator drive signal for moving an optimized light convergence point of the light beam from one recording surface to the other, based on a focus error signal generated based on a returned light from the recording medium. The focus control apparatus comprises a detector for detecting that the focus error signal crosses a predetermined level as a specified level crossing; instruction means for generating a focus jump instruction; a drive signal generating means for generating the drive signal in response to the focus jump instruction and receiving a detection output from the detection circuit to recognize a timing of a specified level crossing of the focus error signal upon receipt of the detection output, thereby extinguishing the drive signal at the timing of the specified level crossing detection timing; and inhibiting means for inhibiting the recognition of the specified level crossing by the drive signal generating section for a predetermined period in response to the focus jump instruction.
REFERENCES:
patent: 5263011 (1993-11-01), Maeda et al.
patent: 5740136 (1998-04-01), Tsutsui et al.
patent: 5781516 (1998-07-01), Yamada
patent: 5999503 (1999-12-01), Tateishi et al.
Kawana Kazushige
Kimikawa Yuichi
Matsuda Norio
Suzuki Takashi
Takahashi Ken'ichi
Huber Paul W.
Pioneer Electronic Corporation
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