METHOD AND APPARATUS FOR GENERATING FOCUS ERROR SIGNAL, OPTICAL HEAD AND OPTICAL DRIVING APPARATUSAANM KAWAMURA; TomotoAACI YokohamaAACO JPAAGP KAWAMURA; Tomoto Yokohama JPAANM Oishi; KotaroAACI FujisawaAACO JPAAGP Oishi; Kotaro Fujisawa JPAANM Nakamura; ToshiteruAACI YokohamaAACO JPAAGP Nakamura; Toshiteru Yokohama JP - diagram, schematic, and image 03
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