公开(公告)号：EP0178116A3

公开(公告)日：1987-08-19

申请号：EP85307022

申请日：1985-10-01

申请人： SHARP KABUSHIKI KAISHA

发明人： Ohta, Kneji ,  Inui, Tetuya ,  Fujii, Yoshikazu ,  Deguchi, Toshihisa Daiya Haitsu Gakuenmae C-722 ,  Maeda, Shigemi

IPC分类号： G11B07/013 ,  G11B13/04 ,  G11B11/10 ,  G11B07/24

CPC分类号： G11B11/10597 ,  G11B7/007 ,  G11B7/0938 ,  G11B7/24 ,  G11B7/24085 ,  G11B11/10563 ,  G11B11/10565 ,  G11B11/10578 ,  G11B11/10582 ,  G11B11/10584

摘要： An optical memory element includes a guide track groove portion (12) and address signal pit portion (13) for indicating the address of the guide track groove. The address signal pit portion has a pit width (t 1 ) narrower than the groove width (t 2 ) of the guide track groove portion.

公开(公告)号：EP0141679A3

公开(公告)日：1986-06-04

申请号：EP84307685

申请日：1984-11-07

申请人： SHARP KABUSHIKI KAISHA

发明人： Deguchi, Toshihisa Daiya Haitsu Gakuenmae C-722 ,  Inui, Tetsuya ,  Fujii, Yoshikazu ,  Yamaoka, Hideyoshi

IPC分类号： G11B11/10

CPC分类号： G11B11/10532

摘要： A magneto-optical memory device includes a recording medium having a magnetic anisotrophy in a direction perpendicular to the main surface thereof. A semiconductor laser is employed in an optical system of the magneto-optical memory device for reproduction purposes. A beam splitted is disposed in the optical system. A multi coated dielectric thin-film is deposited on the reflection surface of the beam splitter in order to establish a desired relationship between the reflection of the P-polarisation and the S-polarisation. A smaller proportion of the P-polarisation is reflected than the S-polarisation, so that the beam acquires a rotation angle greater than the Kerr rotation angle a applied to it by the recording medium.