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Laser-detector-hologram unit for thin optical pick-up head of a CD player

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6 Author(s)
Yoshikawa, A. ; Electron. Res. Lab., Matsushita Electron. Corp., Osaka, Japan ; Nakanishi, H. ; Itoh, K. ; Yamazaki, T.
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A laser-detector-hologram (LDH) unit having the size of 4.8×8.2×1.3 mm for use as a thin optical pick-up head of a CD player has been successfully developed. The technology to make the LDH unit thin and small is based upon the following techniques: 1) an efficient optical combination of a low operating current laser diode and a 45° built-in micromirror which is formed on a Si photodetector substrate, 2) a thin plastic-molded flat package with good thermal dissipation, and 3) a plastic-molded holographic optical element (HOE) as a cap. The pick-up head with the LDH unit has shown good optical performance, which is sufficient for the application to CD players

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Components, Packaging, and Manufacturing Technology, Part B: Advanced Packaging, IEEE Transactions on  (Volume:18 ,  Issue: 2 )