Effect of thermal deformations of an optical pick-up base on the optical properties of DVD optical system

Kim, Hongmin; Cho, Sunghoon; Kang, Shinill

doi:10.1007/s00542-005-0520-x

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…To check the thermal stability, thermal analysis is performed. The material of yoke is zinc and the convection coefficient is settled at 10 W/m 2 K (Kim et al 2004b(Kim et al , 2005Park et al 2006). The bottom area of yoke has 323 K because we assumed that the temperature of pickup base is about 318 K. And the room temperature is 298 K. Heat generated in coils was calculated by resistance and current of coils.…”

Section: Thermal Stability Of the Final Modelmentioning

confidence: 99%

Design of moving magnet type pickup actuator using inserted coil

et al. 2009

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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.

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Section: Thermal Stability Of the Final Modelmentioning

confidence: 99%

Design of moving magnet type pickup actuator using inserted coil

et al. 2009

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Micro thermal design of swing arm type small form factor optical pick-up system

Lee

Kim

et al. 2006

Microsyst Technol

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New multimedia information environment requires smaller optical data storage systems. However, one of the difficulties in the design of small form factor (SFF) optical pick-up is to emit the heat which is usually generated from laser diode (LD). The generated heat may reduce the optical performance of the system as well as the lifetime of LD. Therefore, it is important to include the thermal consideration in the development of SFF optical pick-up system for the high performance and longer lifetime of LD. It is also necessary to analyze the thermal characteristics of LD by the micro heat transfer analysis. In this study, micro heat transfer analysis was performed using the finite element method for the 28 · 11 · 2 mm 3 super slim swing-arm type actuator of the optical pick-up in the Blu-ray disk (BD) format. Two different materials were used for a swing-arm; a double layer structure of polycarbonate/steel and a single layer structure of aluminum.The heat generated from LD (80 · 400 · 600 lm 3 ) ranges from 100 to 250 mW. The maximum temperature at the LD is 78.9°C for the case of polycarbonate/steel swing-arm optical pickup when the heat generation and the convection coefficient are 250 mW and 25 W/m 2 K, respectively. On the other hand, it is 52.87°C for the case of aluminum swing-arm under the same conditions. The result of simulation indicates that the single layer structure of aluminum actuator is more suitable for the for the SFF optical pick-up in the viewpoint of heat release.

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Publications on Thermal Stresses

Zhou¹

2006

Journal of Thermal Stresses

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Effect of thermal deformations of an optical pick-up base on the optical properties of DVD optical system

Cited by 3 publications

References 10 publications

Design of moving magnet type pickup actuator using inserted coil

Design of moving magnet type pickup actuator using inserted coil

Micro thermal design of swing arm type small form factor optical pick-up system

Publications on Thermal Stresses

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