Improvement of dynamic characteristics for optical pickup actuator using sensitivity analysis

Lee, K.-T.; Lee, D.-J.; Park, N.-C.; Park, Y.-P.

doi:10.1007/s00542-002-0228-0

Cited by 13 publications

(10 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An optical pickup actuator is a core component in optical storage devices and used to write the information or read it by positioning precisely an objective lens (OL) on the disk as a track following device. To realize above-mentioned requirements, it is essential for the optical pickup actuator to have wide servo bandwidth and high sensitivity (Lee et al 2002;Song et al 2004;Lee et al 2005b). This servo bandwidth is controlled by flexible mode frequencies and flexible mode peaks which are caused by the flexibility of moving parts in the actuator.…”

Section: Introductionmentioning

confidence: 97%

“…To settle them as the index of the performance of actuators, the gain margin is defined as the absolute value of the difference between the gain at 1 kHz and the gain at the first flexible mode frequency. If an actuator did not have sufficient gain margins, total system becomes unstable for high-speed operations in high density reading and recording (Song et al 2001;Lee et al 2002;Song et al 2004). Therefore, the flexible mode frequencies and peaks of optical pickup actuators are the most important factors for high density reading and recording.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Design of hybrid type’s optical pickup actuator for system stability in high density reading and recording

et al. 2009

View full text Add to dashboard Cite

Recently, there has been a trend to have large capacity and high data transfer rate in optical disk drive. Pickup actuator also should have high performance for satisfying this trend. Since moving magnet type actuator has more simple and robust structure than moving coil type one, we designed moving magnet type to accomplish high flexible mode frequency. However, the driving sensitivity of moving magnet type actuator was low because of its characteristics as following. At first, moving parts including magnets are heavy and electromagnetic (EM) circuits are not closed-loop owing to yoke composed of paramagnetic materials. Therefore, in order to increase the driving sensitivity without the degradation of the other dynamic characteristics, EM circuits were redesigned by adding solenoid coils on existing mechanism. As a result, the hybrid type actuator composed of moving magnet type and moving coil type was suggested to obtain high sensitivities and high flexible mode frequency. Design variables of EM circuits and structure parts were decided through parametric study and design of experiments procedure. Optimization algorithm using variable metric method was used to improve performance. Based on these results, the final model was presented.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Design of hybrid type’s optical pickup actuator for system stability in high density reading and recording

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Adding for the comparison, the data transfer rate of BD 1x is defined as 36 Mbps and the one of DVD 1x is defined as 1.38 Mbps. To achieve high rotational speed of disc with maintaining the system stability, pickup actuator should have high resonance frequencies and low resonance peaks of flexible modes (Song et al 2001(Song et al , 2004Lee et al 2002). The frequencies are depend on the structural stiffness of the moving part of the actuator.…”

Section: Introductionmentioning

confidence: 98%

Design of moving magnet type pickup actuator using inserted coil

et al. 2009

View full text Add to dashboard Cite

Recently, the demand of the information storage devices with large storage capacity such as Blu-ray Disc and high-definition television is increased. In keeping with this trend, the optical storage devices are also required to have high data transfer rate and large storage capacity. To satisfy these requirements, the actuator for optical disc drive should have a high servo bandwidth to compensate the vibration of optical disc. The servo bandwidth is limited by some flexible modes of the actuator, thus it is essential to make these frequencies of flexible modes to high frequency region. The frequency of flexible mode depends on materials and shape. Stiff materials and simple shape is useful to increase the frequency of flexible mode. In this paper, we suggested a moving magnet type actuator having flexible modes which are happened at high frequency region. Generally, the moving magnet type actuator has an advantage to increase the frequency of flexible mode because the moving magnet type actuator has simple structure and the Young's modulus of magnet is high.However, large moving mass and inefficiency of Electromagnetic (EM) circuit cut down driving sensitivities of actuator. To improve driving sensitivities, we designed the model with the closed EM circuit for tracking actuation. The design of experiments (DOE) procedure is applied to get proper design parameters and the variable metric method (VMM) which is a technique of optimization is used to improve driving sensitivity. The lens holder is also improved based on the optimization result of EM circuit. And to make up for the low efficiency of EM circuit, the thermal stability is checked on condition that the input current is very high. At last, the final design of moving magnet type actuator is suggested and it is verified that the driving performance and the structural stiffness of the final design is sufficient.

show abstract

“…Lee et al (2003) changed the direction of magnetic flux to carry on the simulation experiment and finally shifted the flexible modes by applying the supplementary force with the supplementary side magnets. Lee et al (2002) applied the FEM with sensitivity analysis method in the rib-structure optimization of the lens holder to improve the stiffness of moving part in order to raise the flexible resonance frequency of the actuator. Lee et al (2007) proposed a novel slim actuator which combined the advantages of both symmetric and asymmetric actuators together used in the flexible disk system.…”

Section: Introductionmentioning

confidence: 99%

Integrated optimization design for high-speed three-axis actuator in optical pickup

Zhang

Pan

et al. 2008

Microsyst Technol

View full text Add to dashboard Cite

Super-multi DVD drives are assumed to have the largest market share in the near future because of their high compatibility with all kinds of DVD/CD formats and high recording-reading speed at low cost. In this paper, we present a three-axis actuator used in a super-multi drive with a special magnetic circuit, consisting of symmetric driving coils and permanent magnets with proper placement. At first, the lens holder is optimized with sensitivity method to improve the flexible vibration modes in structure parts. Then, electromagnetic circuits are designed and optimized by Taguchi method and response surface methodology (RSM). Consequently, the final model is fabricated and tested by laser vibrometer system. The results verify the proposed actuator and the integrated design methods.

show abstract

Improvement of dynamic characteristics for optical pickup actuator using sensitivity analysis

Cited by 13 publications

References 4 publications

Design of hybrid type’s optical pickup actuator for system stability in high density reading and recording

Design of hybrid type’s optical pickup actuator for system stability in high density reading and recording

Design of moving magnet type pickup actuator using inserted coil

Integrated optimization design for high-speed three-axis actuator in optical pickup

Contact Info

Product

Resources

About