樹脂筐体を採用した薄型光学ヘッドの耐環境実装構造

概要

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Servo signals, such the focusing or tracking error signals of an optical head, are generated from the position or the intensity distribution of the beam spot on the detector. If the beam spot position on the detector deviates as ambient temperatures change, the servo signals fluctuate. Therefore, reducing the position deviation is necessary in order to obtain highly reliable reading or writing operations. We derived a formula where the position deviation of the beam spot on the detector with temperature is approximately expressed as a linear combination of the factors of the position deviations caused by displacement and tilt of each optical part. To reduce the position deviation of the beam spot, we developed a method where effect of one optical part on the position deviation offsets that of another optical part. Using this method, we developed a jisso structure of a slim optical head utilizing a resin housing. The measured position deviation on the detector is 6.2% of the diameter of the beam spot or less at ambient temperatures between 0 and 65℃.
社団法人日本機械学会の論文
2008-04-25