Samsung Electronics Co., Ltd.

Yonsei University

Noh-cheol Park

Hyun-seok Yang

Joong-gon Kim

Kyung-geun Lee

Chong-sam Chung

Jin-Kyung Lee

Jong-hyun Shin

An-sik Jeong

Joon Seon Jeong

Young-jae Park

A gap servo control method and apparatus for increasing a disturbance cancellation capability and decreasing the occurrence of an overshoot in a near-field optical disc drive include: generating an actuator driving signal of a transient response process by using a signal obtained by removing a disturbance contained in the gap error signal using a first band when a level of a gap error signal reaches a first level; and generating the actuator driving signal of the transient response process by using a signal obtained by removing the disturbance contained in the gap error signal using a second band when the level of the gap error signal reaches a second level.

Gap servo control method and apparatus in near-field optical disc drive

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.

Optical disc apparatus and method of driving the same

Growing community of inventors

Seoul, South Korea

Noh-cheol Park