Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Optical pickup using an optical phase plate
 A recording/reproducing apparatus includes an optical pickup device having an optical phase plate which is compatible with optical recording mediums having different thicknesses, and an optical signal processing device processes information read from the optical recording mediums and processes information to be recorded thereon using the optical pickup device. 
Samsung Electronic Co., Ltd.
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Jang Hoon No Kyong Yong Hoon Tae Kyung Hyun Seob Chong Sam Kun Ho Pyong Yong Chul Woo
Yoo Park Lee Kim Choi Chung Cho Seong Lee