INTERCHANGEABLE OPTICAL PICKUP FOR DIGITAL VIDEO DISK AND CD-R von SEI HEIYO

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OPTICAL RECORDING/REPRODUCING APPARATUS AND METHOD FOR DETECTING TRACKING ERROR SIGNAL von HWANG IN-WOOK, SEI HEIYO, KIM KUN-SOO

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OPTICAL OUTPUT MODULE AND INTERCHANGEABLE OPTICAL PICKUP DEVICE USING THE SAME von SEI HEIYO, SON RYUKI, RYU HEIRETSU, RI YOSAI

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OPTICAL OUTPUT MODULE AND INTERCHANGEABLE OPTICAL PICKUP DEVICE EMPLOYING THIS MODULE von SEI HEIYO, SON RYUKI, RYU HEIRETSU, RI YOSAI

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JP2873800B von HAYASHI YOSHIKAZU, TEI SHOZO, SEI HEIYO, RI TETSU

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OPTICAL SYSTEM FOR BEAM SHAPING AND OPTICAL PICKUP ADOPTING IT von KIN TAIKEI, SEI HEIYO, RI TETSUU

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OPTICAL PICKUP DEVICE von SHIN TOKO, SEI HEIYO, RI TETSUU

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OPTICAL PICKUP DEVICE von KIN TAIKEI, SEI HEIYO, RI TETSUU

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OBJECTIVE LENS DEVICE AND OPTICAL PICKUP DEVICE ADOPTING THE SAME von SEONG PYONG-YONG, SEI HEIYO, RI TETSUU

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INTERCHANGEABLE OPTICAL PICKUP DEVICE von KIM JONG-RYULL, SEI HEIYO, LEE JOO-HYOUNG, KWAK NO-JUN, KIM KUN-SOO

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OPTICAL PICKUP APPARATUS, AND OPTIMAL LIGHT SPOT FOCUSING METHOD von BA HEIIN, LEE JONG-KOOG, SEI HEIYO, YANG CHANG-JIN, GO SUNG-RO, RI YOSAI, SONG GI-BONG

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OPTICAL PICKUP ASSEMBLY ADJUSTABLE IN INCLINATION von KIN TAIKEI, SEI HEIYO, SON RYUKI, YOO JANG-HOON, KIN SEKICHU, RYU HEIRETSU, RI YOSAI

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OPTICAL PICKUP USING OPTICAL PHASE PLATE von RYU CHOKUN, CHO KENKO, KIN TAIKEI, TEI SHOZO, RI YOKUN, SEI HEIYO, SAI KENSHO, BOKU ROKYO, RI TETSUU

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COMPATIBLE TYPE OPTICAL PICKUP DEVICE von KIM JONG-RYULL, YU JONG-HWA, SEI HEIYO, YOO JANG-HOON, LEE CHUL-WOO, OH HYUNG-TAEK, KIM KUN-SOO, CHOI MYOUNG-SOO, CHO KUN-HO

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