• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.58 no.8
• /
• pp.1595-1604
• /
• 2009

An Optical disk driver is used in many electronic products besides the computers. In particular, the demands are recently increased as an optical disk player/recorder in the mobile products such as camcorder, portable player or in the home theater appliances, etc. However, the more the mobility is emphasized, the more the optical disk player is exposed to the disturbance inputs. For reducing the possibility of malfunction of the optical disk, we propose a nonlinear controller using the disturbance detecting algorithm based on the Kalman filter. Actual experiments were executed to verify the performance of the proposed method. The proposed method controls the tracking error signal within ${\pm}0.1{\mu}m$.

• Proceedings of the KIEE Conference
• /
• 2003.07d
• /
• pp.2146-2148
• /
• 2003

This paper present a modified repetitive control scheme for an optical storage system to track a periodic reference signal with dynamic change in period. Periodic disturbances can be adequately attenuated using the concept of repetitive control, provided the period is know. An optical storage system supports various speeds. To deal with time varying periodic disturbances, an proposed repetitive controller is turned based on repetitive control to change sampling frequency to follow the change of reference Period. A modified repetitive control scheme is proposed and implement on experimental set up of a optical disk driver.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1517-1518
• /
• 2008

Optical disk driver is being used in many electronic products besides computer. In particular, the demands are recently increased as an optical disk player in the mobile products such as camcorder or in the home theater appliances, or etc. However, under these circumstances, the disturbance inputs to the optical disk player increase gradually. In this paper, for reducing the possibility of malfunction of the optical disk player, we propose the method of detecting and controling the non-periodic external shock of the disturbances. Also, we execute some simulations and actual experiments and discuss the results.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2012.04a
• /
• pp.76-81
• /
• 2012

In-process evaluation equipment for the prominent discrete tone (PDT) emitted by small motors or actuators such as HDD(Hard Disk Driver), ODD(Optical Disk Driver) or linear motors has been developed and estimated on the basis of Prominence Ratio (PR) method in ECMA 74. Correlation of the evaluation equipment was performed in comparison with the method by ECMA 74 in anechoic chamber. Coherent function between two systems was applied in order to compensate traceability of ECMA 74 in anechoic chamber. Usability of the developed system with estimated Gage R&R shall be approved with real samples in the mass production line.

• Journal of the Korean Society for Precision Engineering
• /
• v.18 no.4
• /
• pp.203-208
• /
• 2001

In this paper, a novel dual-type positioning mechanism using a voice coil motor(VCM) and a piezoelectric actuator is proposed for optical disk drive or near-field recording type drive. The VCM is used for a coarse motion actuator and the piezoelectric actuator, "S" configuration deflection motion when voltage applied, is used for a fine motion actuator with self-sensing technique, which allows it to sense and actuate simultaneously in a closed loop frame work. When the VCM rotates and stops, a position feedback control algorithm is adopted to further control residu vibration. The performance of the control scheme is confirmed through simulations and experiments.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1994.10a
• /
• pp.444-448
• /
• 1994

광 fiber를 이용한 새로운 구조의 초고속 광디스크 드라이버를 제안하였다. 기존의 광 픽 업 모듈을 레리져 다이오드, 광검출기, 렌즈 및 각종 광학계등의 무거운 부분과 GRIN렌즈 및 초경량의 PD로만 구성되는 광 헤드의 가벼운 부분으로 분리하였다. 무거운 부분은 Fixed part로 고정시키고 가벼운 부분만을 Moving part로 함으로써 광 헤드의 tracking 속도를 증가 시켰다. 또한 컴퓨터의 하드디스크 드라이버에서와 같은 초고속의 Pivot-arm tracking방식 을 채용하기 위해 Fixed part와 Moving part를 광 fiber를 이용해 접속하였으며 이 새로운 구 조에서 데이타 신호, tracking 및 focusing 에러 신호를 검출하는 메커니즘에 대해 설명하였다.