High-performance optical pick-up actuator with singlet objective lens for BD/DVD/CD compatible drive

Song, Byung Youn; Lee, Young Bin; Jang, Dae Jong; Lee, Jong Kook; Lee, Junghoon

doi:10.1007/s00542-006-0333-6

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…The lens is often positioned by a rough tracking servo to the vicinity of the depth of focus, and, subsequently, fine-positioned by a fine tracking servo within the range of the depth of focus in an optical pickup system [32]. This focus range corresponds to roughly 10% of the total required range for coarse tracking, but is about 23 times the focal depth of BD-RE (±0.22 μm) [33], so that this actuator will function as a fine tracking servo.…”

Section: Resultsmentioning

confidence: 99%

Compact Three-Axis Actuator for Positioning a Polymer Microlens in an Optical Pickup

Pan

Zappe

2014

J. Microelectromech. Syst.

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We describe a microelectromechanical systemsbased actuator for three-dimensional (3D) positioning of a polymer microlens implemented using silicon-on-glass technology. The actuator combines comb drives for lateral tracking with electrostatic parallel plates for out-of-plane focusing as well as tilting of a polymer microlens, yielding fully 3D actuation. The complete actuator is fabricated using wafer bonding of silicon and pyrex wafers; the lens is integrated using polymer dispensing techniques. The 3 DOF positioning of the lens for focusing, tracking, and tilting are experimentally characterized, furthermore, the layout and symmetry would allow 4 DOF movement, demonstrating how this actuation system combined with an integrated lens may be particularly useful for new generations of optical pickups.[2013-0036]

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Section: Resultsmentioning

confidence: 99%

Compact Three-Axis Actuator for Positioning a Polymer Microlens in an Optical Pickup

Pan

Zappe

2014

J. Microelectromech. Syst.

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“…3a with suspensions and a moving mass which can be generally assumed as simple second order system with a mass, a spring and a damping element (Song 2007). And we can predict the thrust force on each effective coil by calculation of Lorentz's force which is derived by magneto static field.…”

Section: Theoretical Analysismentioning

confidence: 99%

Auto-focusing actuator and camera module including flexible diaphragm for mobile phone camera and wireless capsule endoscope

Song

Nam²,

Kim³

et al. 2009

Microsyst Technol

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Recent cellular phones have high-resolution, compact digital camera modules that have several millions of pixels. Although being small, such several mega-pixel camera modules definitely need to be able to execute autofocusing and/or optical zooming in order to obtain precise images. Hence, image photographing devices having driving mechanisms that can move a lens group in the direction parallel to an optical axis have appeared such as piezoelectric type, linier motor type, and voice coil motor type. Although these technologies are already popular in existing digital cameras, driving mechanism for camera modules in cellular phones needs to be extremely improved because their requirements are totally different from usual digital cameras. Compact image photographing devices, which are installed in mobile apparatuses, should improve portability by reducing their sizes and weights and increase use-time of a battery by reducing power consumption. Weakened suspension (e.g. thickness is 0.02 mm or less) in order to minimize an elastic coefficient for drastic decrease of driving current frequently occurs permanent step-out of a lens group by plastic deformation of the metal suspensions when it comes to getting shocks from accidental drops of a handset. The proposed auto-focusing actuator using conductive polyimide as a flexible diaphragm satisfies these requirements of ultra slim cell phones. This polyimide suspension shows ultimate toughness when it comes to drop-test of cell phones. This actuator also shows high performance quite enough for several mega-pixel camera modules for ultra slim cellular phones; the moving range is up to 0.35 mm, the DC sensitivity is 0.2 mm/140 mA, and the resistance at the terminal is 22 Ohm, whereas the aperture is 6.8 mm, and the overall size is 10 9 10 9 3.95 mm. Most of all, the robustness against drop and shock has been dramatically increased, with no change of reliability under high temperature and high humidity condition, because of the flexibility of the conductive polyimide suspension.

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“…Kim et al (2005) proposed the twin objective lens actuator which is compatible with CD/DVD and BD. Song et al (2007) showed the high-performance optical pickup actuator with singlet objective lens for BD/DVD/CD compatible drive.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Pan

et al. 2008

Microsyst Technol

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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.

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High-performance optical pick-up actuator with singlet objective lens for BD/DVD/CD compatible drive

Cited by 10 publications

References 2 publications

Compact Three-Axis Actuator for Positioning a Polymer Microlens in an Optical Pickup

Compact Three-Axis Actuator for Positioning a Polymer Microlens in an Optical Pickup

Auto-focusing actuator and camera module including flexible diaphragm for mobile phone camera and wireless capsule endoscope

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

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