公开(公告)号：EP0222183A2

公开(公告)日：1987-05-20

申请号：EP86114142.2

申请日：1986-10-13

申请人： HITACHI, LTD.

发明人： Yamada, Masamichi ,  Kurebayashi, Masaaki ,  Saito, Masakatsu ,  Yanagihara, Hitoshi ,  Konishi, Katsuo ,  Tsuchiya, Toshio

IPC分类号： G11B5/31 ,  G11B5/187

CPC分类号： G11B5/3116 ,  G11B5/31 ,  G11B5/3143

摘要： In a thin film magnetic head consisting of a non-magnetic substrate (I), and a multilayer structure superposed thereon and including a lower core (2), a gap material layer (II), a thin film coil (13) and an upper core (6), etc., the head sliding surface of the lower core (2) and that of the upper core (6) are so formed that they become wider with increasing distance from the surface of the gap material layer (II).

公开(公告)号：EP0222183B1

公开(公告)日：1994-01-12

申请号：EP86114142.2

申请日：1986-10-13

申请人： HITACHI, LTD.

发明人： Yamada, Masamichi ,  Kurebayashi, Masaaki ,  Saito, Masakatsu ,  Yanagihara, Hitoshi ,  Konishi, Katsuo ,  Tsuchiya, Toshio

IPC分类号： G11B5/31 ,  G11B5/187

CPC分类号： G11B5/3116 ,  G11B5/31 ,  G11B5/3143

公开(公告)号：EP0280028B1

公开(公告)日：1993-08-04

申请号：EP88100697.7

申请日：1988-01-19

申请人： HITACHI, LTD.

发明人： Tokushuku, Nobuhiro ,  Yanagihara, Hitoshi ,  Hazama, Katashi ,  Yoshii, Masaki ,  Ebinuma, Naotake

IPC分类号： G11B7/24

CPC分类号： G11B7/26 ,  G11B7/0938 ,  G11B7/24

公开(公告)号：EP0280028A3

公开(公告)日：1990-09-05

申请号：EP88100697.7

申请日：1988-01-19

申请人： HITACHI, LTD.

发明人： Tokushuku, Nobuhiro ,  Yanagihara, Hitoshi ,  Hazama, Katashi ,  Yoshii, Masaki ,  Ebinuma, Naotake

IPC分类号： G11B7/24

CPC分类号： G11B7/26 ,  G11B7/0938 ,  G11B7/24

摘要： An optical disc consists of a base plate, a reflective thin layer, and a protective thin layer. The optical disc has sample mark area (32) having two sample marks (10, 11), one (10) of which is off-set one side of a track, another (11) of which is off-set another side of a track. These sample marks are produced by an injection molding with replica technique. At the time of the injection molding, additional pressure moves soft injected plastic resin, which causes double transcription (10a, 11a) of the sample marks (10, 11). For preventing the double transcription, groove areas (35, 36) are provided both sides of the sample mark area (32). The groove areas (35, 36) has an anchor effect at the time of injection molding.

公开(公告)号：EP0280028A2

公开(公告)日：1988-08-31

申请号：EP88100697.7

申请日：1988-01-19

申请人： HITACHI, LTD.

发明人： Tokushuku, Nobuhiro ,  Yanagihara, Hitoshi ,  Hazama, Katashi ,  Yoshii, Masaki ,  Ebinuma, Naotake

IPC分类号： G11B7/24

CPC分类号： G11B7/26 ,  G11B7/0938 ,  G11B7/24

摘要： An optical disc consists of a base plate, a reflective thin layer, and a protective thin layer. The optical disc has sample mark area (32) having two sample marks (10, 11), one (10) of which is off-set one side of a track, another (11) of which is off-set another side of a track. These sample marks are produced by an injection molding with replica technique. At the time of the injection molding, additional pressure moves soft injected plastic resin, which causes double transcription (10a, 11a) of the sample marks (10, 11). For preventing the double transcription, groove areas (35, 36) are provided both sides of the sample mark area (32). The groove areas (35, 36) has an anchor effect at the time of injection molding.

摘要翻译： 光盘由基板，反射薄层和保护薄层组成。 光盘具有样品标记区域（32），其具有两个采样标记（10,11），其中一个（10）偏离轨迹的一侧，另一个（11）偏离了一个轨迹的另一侧 跟踪。 这些样品标记通过具有复制技术的注射成型制备。 在注射成型时，另外的压力移动软注射的塑料树脂，这导致样品标记（10,11）的双重转录（10a，11a）。 为了防止双重转录，在样品标记区域（32）的两侧设置有凹槽区域（35,36）。 槽区域（35,36）在注射成型时具有锚固效果。