Hideyuki Nakanishi

LDH (laser/detector/hologram) unit for thin optical pick-up head of CD player

The LDH unit with the size of 4.8/spl times/8.2/spl times/4.3 mm for a thin optical pickup head of a CD player has been successfully developed. The technology to make the LDH unit thin and small is based upon (1) the most efficient optical combination of the low operation current laser diode with the 45/spl deg/ built-in micro-mirror which is formed on the Si photodetector substrate, (2) the thin plastic-molded flat package with good thermal dissipation, and (3) the plastic-molded holographic optical element (HOE) as a cap. The pick-up head using the LDH unit has shown good optical performance sufficient for the application to CD players.<<ETX>>

LDH (Laser-Detector-Hologram) Unit for Extremely Thin Optical Pick-up

Akio YOSHIKAWA*, Hideyuki NAKANISHI*, Akira UENO*, Hideo NAGAI*, Nobuyuki IWAMOTO** and Kunio ITOH* *松 下電 子工業株式会社電子総合研 究所(〒569大 阪府高槻市幸 町1-1) **松 下電子工業株式 会社デ ィスク リー ト事業 部(〒617京 都府 長岡京市神足焼町1) *Electronics Research Laboratory, Matsushita Electronics Corporation(1-1 Saiwaicho, Takatsuki-shi, Osaka 569) **Discrete Division , Matsushita Electronics Corporation(1 Kotariyaki-machi, Nagaokakyo-shi, Kyoto 617)