Optical disc apparatus and method of driving the same

Details Optical disc apparatus and method of driving the same Optical disc apparatus and method of driving the same

2011-08-02

2011-08-02

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112240

Reexamination Certificate

active

07990815

ABSTRACT:
An optical disc apparatus, and a method of driving the same, includes a light focusing element disposed to focus light emitted from a light source onto a disc; an actuator to move the light focusing element toward or away from the disc according to a voltage applied to the actuator; a light intensity detection unit to detect the intensity of light reflected from the disc; a servo unit to generate a gap error signal and a third voltage, the third voltage being the sum of a first voltage and a second voltage, and to apply the generated third voltage to the actuator; and a control unit to control the servo unit to perform a gap pull-in operation when the light focusing element is moved toward the disc according to the gap error signal and the third voltage.

REFERENCES:
patent: 2002/0048236 (2002-04-01), Tada et al.
patent: 2003/0067850 (2003-04-01), Takahashi et al.
patent: 2005/0180283 (2005-08-01), Ishimoto et al.
patent: 2006/0187773 (2006-08-01), Ishimoto
patent: 2004-220743 (2004-08-01), None
patent: WO 2005/101391 (2005-10-01), None
International Search Report dated Jun. 11, 2008 of the PCT Application No. PCT/KR2008/001177.

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