A novel type of 3-axis lens actuator with tilt compensation for high-density optical disc system

He, Nanying; Jia, Weipu; Yu, Dingwen; Huang, Lei; Gong, Mali

doi:10.1016/j.sna.2004.04.008

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…3 Design and evaluation of performance of tilt 3.1 Compensation mechanism Figure 2a schematically depicts conventional seesaw actuation for a seesaw arm actuator; the shortcomings of optical axis tilting have been described in more detail (Hong et al 2005;He et al 2004). The same principle holds applies to small skew focusing.…”

Section: Sensor Validation and Tilt Detectionmentioning

confidence: 99%

Enhancement of PZT embedded swing arm actuator using integrated read/write performance and actuation

2012

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The current technological challenges associated with the rotary-type seesaw arm actuator for small-formfactor (SFF) disk drives are the small skew focusing, which causes off-axis aberrations and reduces optical quality. This article develops a novel design for a seesaw arm actuator and suspension assembly that is based on a micro-PZT actuator to position pickup head. Dual-stage actuation relaxes the dynamic requirement on the focusing stroke. The proposed actuator with a tilt-compensation mechanism uses a PZT bender to drive pickup head focusing. This combined system, optical module and dual stage actuator, is effectively self-aligned the optical axis for read/write performance in both experiment and simulation result. Finite element modeling and dynamic measurements reveal significant improvements in the actuator bandwidth with and without micro-PZT actuator compensation.

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Section: Sensor Validation and Tilt Detectionmentioning

confidence: 99%

Enhancement of PZT embedded swing arm actuator using integrated read/write performance and actuation

2012

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“…There are several studies on actuators satisfying this requirement. Motegi [13,14]. These actuators have two wire-suspensions to get high flexibility in the radial tilt direction or/and tangential tilt direction.…”

Section: Research Motivationmentioning

confidence: 99%

Vibration of two cantilever beams clamped at one end and connected by a rigid body at the other

Lee

2009

J Mech Sci Technol

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This study presents the pure bending and coupled bending-torsional vibration characteristics of a beam structure which consists of two cantilever beams and a rigid body at their free ends. This structure is available in many mechanical structures such as robots, space constructions, and optical pickup actuators in optical disc drives (ODDs). In order to depict the vibration of the beam structure originating from the deflection and torsion of two beams, the motion equations and continuity conditions are analytically induced by using energy conservation. In the process that the free vibration problem is solved, two independent characteristic equations are obtained. The former is an equation for the pure bending vibration of two beams, and the latter is for their coupled bending-torsional vibration. It is proved that these characteristic equations are exact by comparing natural frequencies obtained from FEM. As natural frequencies are described in many dimensional variations, the relation between vibration characteristics and the dimensions of the given system is also investigated. Finally, resonant frequencies from test results are presented to confirm the validation of this study for a new type optical pickup actuator.

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“…The second factor is the unavoidable small un-parallelism in practice between the lens and the optical disc in high-speed rotations or the surface to profile. To restrain the bobbin tilting to a small level for a more accurate, faster data-reading, some research works (Choi et al 2001;Kang and Yoon 1998;Rosmalen 1987;Yamada et al 2000;Chao et al 2003;He et al 2004) have successfully developed the tilt servo systems for the bobbin, in addition to original focusing and tacking ones. The tilt servo makes possible the capability of suppressing the unavoidable bobbin tiltings.…”

Section: Introductionmentioning

confidence: 99%

Precision positioning of a three-axis optical pickup via a double phase-lead compensator equipped with auto-tuned parameters

2009

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The objective of this study is to design an intelligent control servo scheme for the three-axis optical pickups employed in the next-generation optical disc drives. The three-axis pickup owns the capability to move the lens holder in three directions of focusing, tracking and tilting, which is required particularly for higher datadensity optical disks and precision measuring instruments to annihilate non-zero lens tilting. The intelligent controller utilizes a commercially often-used double phase-lead compensator equipped with the capability of auto-tuning on control parameters. In this way, the model uncertainty of the pickups caused by manufacturing tolerance and the coupling between three different DOFs of the three-axis pickup can be overcome to render desired precision datareading. In the initial stage of the study, Lagrange's equations are employed to derive equations of motion for the lens holder. A double-lead controller equipped with a fuzzy logic parameter tuning algorithm is then designed to perform dynamic decoupling and forge control efforts toward the goals of precision tracking, focusing and zero tilting simultaneously. Along with the controller, a genetic algorithm is developed to search the optimal designed parameters of previously designed auto-tuning algorithm. Finally, the experiments are conducted to show the effectiveness of the controller. With validated performance, the designed intelligent controller is ready to be employed for the next-generation optical disc drives.

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A novel type of 3-axis lens actuator with tilt compensation for high-density optical disc system

Cited by 8 publications

References 1 publication

Enhancement of PZT embedded swing arm actuator using integrated read/write performance and actuation

Enhancement of PZT embedded swing arm actuator using integrated read/write performance and actuation

Vibration of two cantilever beams clamped at one end and connected by a rigid body at the other

Precision positioning of a three-axis optical pickup via a double phase-lead compensator equipped with auto-tuned parameters

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