27 September 2008 Dynamic focus control of the Blu-ray optical pickup unit
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The collimator in BD/DVD/CD compatible optical pickup unit has been designed to motivate and translate along the optical axis by the motor, for multi kinds of disc compatibilities of spherical aberration compensation incurred when reading and writing. The driving motor is huge and not easy to activate. Another technical obstacle to be handled is the alignment so that the reflective mirror should be adjusted and rotated along two axes. In this paper, this kind of optical pickup unit might be minimized, and realize dynamic focus control by micro machined deformable mirror. The optimal sensitivity should be achieved when the focusing spot size is equal to the diffraction limited diameter of the focal spot of the reflected beam.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xuemin Cheng, Jianshe Ma, Qun Hao, "Dynamic focus control of the Blu-ray optical pickup unit", Proc. SPIE 7100, Optical Design and Engineering III, 71000V (27 September 2008); doi: 10.1117/12.797692; https://doi.org/10.1117/12.797692


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