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Design and evaluation of a Blu-ray pickup head system for determining the tilt angle and displacement of the test plane |
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| Authors: | Wen-Shing SunChuen-Lin Tien Te-Yuan ChungYan-Nan Lin Ju-Yi LeeDung-Yi Hsieh Tsai-Wei Lin |
| Affiliation: | a Department of Optics and Photonics, National Central University, 32001 Chung-Li, Taiwan b Department of Electrical Engineering, Feng-Chia University, 40724 Taichung, Taiwan c Institute of Opto-Mechatronics Engineering, National Central University, 32001 Chung-Li, Taiwan |
| Abstract: | We present an optical system design for determining the tilt angle and displacement of the test plane. The proposed optical system consists of a Blu-ray pickup head and a pigtailed laser diode with a uniform Gaussian beam. The optical system is evaluated by two optical design software packages, Code V and LightTools. A quadrant detector is used to detect the relative relationship of the VA, VB, VC and VD output signals, which can be used to measure the tilt angle and displacement on the test plane. Both the tilt angle and displacement on the test plane can be determined from the change in the beam shape on the quadrant detector. The proposed system can generate a circular uniform beam shape to reduce the misjudgment and to enhance the measurement accuracy. Various simulation cases are presented in detail to show the feasibility of the proposed system. |
| Keywords: | Blu-ray pickup head Optical system design Pigtailed laser diode Normalized focus error signal |
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