Development of a Three-Dimensional Actuator for Compensating Disc Tilt in Slim Optical Disc Drives

Kimura, Katsuhiko; Ogasawara, Hiroshi; Satake, Mitsuo; Ito, Tetsuo

doi:10.1299/kikaic.71.597

Cited by 4 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is necessary for objective lens actuators in highdensity and high-speed optical disc drives to have high driving sensitivity and high frequency of elastic vibration modes of a moving part in the actuators [1][2][3][4], and also to reduce the inclination of the objective lens when it is moved in the direction of focus or tracking [5][6][7][8]. When the resonance frequency of the rolling mode of the moving part is especially close to the rotational frequency of the disc, the rolling tilt amplitude of the objective lens tends to increase.…”

Section: Introductionmentioning

confidence: 99%

Reduction in Rolling Tilt of Objective Lens Actuators for Optical Disc Drives

Kimura

Saito

Sugiura

2015

Journal of the Japan Society of Applied Electromagnetics and Me

Self Cite

View full text Add to dashboard Cite

It is necessary to reduce the inclination of the objective lens in high-density optical disc drives to improve recording and reading characteristics. We have developed a new objective lens actuator that is equipped with an optical disc drive and that moves the objective lens electromagnetically. This actuator has a configuration in which the tracking coils and magnets on one side of the actuator are arranged in reverse to those on the other side to reduce the rolling tilt of the objective lens. The rolling moments generated in the tracking coils on both sides of the actuator occur opposite to each other, and the resulting rolling moment is reduced. We confirmed through numerical analysis and experiments that the rolling tilt amplitude at the rolling resonance of the developed actuator was 90% less than that of the value for a conventional actuator.

show abstract

Section: Introductionmentioning

confidence: 99%

Reduction in Rolling Tilt of Objective Lens Actuators for Optical Disc Drives

Kimura

Saito

Sugiura

2015

Journal of the Japan Society of Applied Electromagnetics and Me

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, the thickness of these devices is also required to be reduced due to the demands of miniaturization. Kimura et al (2005) developed an actuator using electromagnetic forces that could drive an objective lens within a tilt angle of ±6 min that had a height of 6 mm.…”

Section: Introductionmentioning

confidence: 99%

A circular arc slider with a high flying height supported by parallel flat springs for optical disc devices

2006

View full text Add to dashboard Cite

We have investigated a circular arc slider with a high flying height that is suitable for optical disc devices to reduce the thickness of the device and to achieve a higher recording density over a wider recording area. Our proposed slider was supported by parallel flat springs to reduce the tilting motions of the slider in the pitching and rolling directions. Two types of slider were examined: (1) a positive pressure slider with a single shallow pocket on the slider surface, and (2) a negative pressure slider with two shallow pockets. The static and dynamic characteristics of our proposed slider were investigated both theoretically and experimentally. It was found that our proposed sliders followed a disc surface with the amplitude of axial runout of 100 lm with a focusing error of 30 lm p-v in the focusing direction and a tilt angle of <6 min p-v in the pitching and rolling directions.

show abstract

Frequency response characteristics of objective lens actuators for optical disc drives using viscoelastic damping material

Kimura¹,

Ochi²,

Mizuno³

et al. 2015

Transactions of the JSME (In Japanese)

View full text Add to dashboard Cite

Objective lens actuators are mechanical devices for positioning the objective lens in optical disc drives. The moving part in the objective lens actuator, which is comprised of the objective lens, a holder holding the objective lens, and coils attached to the holder, is supported movably relative to the fixed part by suspension wires and moved electromagnetically in the focusing and tracking directions. The resonance of the supporting system with suspension wires occurs as a main resonance in the frequency response characteristics of an objective lens actuator. It influences the driving sensitivity and settling time of the servo system. Therefore, it is necessary to design the frequency and damping of the main resonance appropriately. The frequency response characteristic of a supporting system with suspension wires is different from the general response of a spring-mass-dashpot system due to the viscoelasticity of the silicone gel added to the suspension wires for damping. In this paper, silicone gel is considered as a spring, the elastic modulus of which is expressed in a function of the frequency so that the vibration model of the supporting system of suspension wires is described easily. Simulated results with this model showed good agreement with experimental results, and it was confirmed that this model is effective for analyzing the frequency response characteristics of objective lens actuators.

show abstract

Development of a Three-Dimensional Actuator for Compensating Disc Tilt in Slim Optical Disc Drives

Cited by 4 publications

References 0 publications

Reduction in Rolling Tilt of Objective Lens Actuators for Optical Disc Drives

Reduction in Rolling Tilt of Objective Lens Actuators for Optical Disc Drives

A circular arc slider with a high flying height supported by parallel flat springs for optical disc devices

Frequency response characteristics of objective lens actuators for optical disc drives using viscoelastic damping material

Contact Info

Product

Resources

About