公开(公告)号：EP1469462B1

公开(公告)日：2008-08-27

申请号：EP04017651.3

申请日：1997-08-14

Applicant: Hitachi, Ltd. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko,c/o Hitachi Ltd, Int.Prop. Group ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro c/o Hitachi Ltd, Int.Prop. Group

IPC: G11B7/09 ,  G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

公开(公告)号：EP1469462A3

公开(公告)日：2004-12-22

申请号：EP04017651.3

申请日：1997-08-14

Applicant: Hitachi, Ltd. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro

IPC: G11B7/09 ,  G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam (8) is passed through a space surrounded by a tracking coil (4) and a focusing coil (5) which are adjacent to each other and fixed in a holder (3). Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances (12-1) to (12-(4) which are radially extended with the sliding shaft (6) at the center are provided in the lens holder (3), and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC. To achieve this object, a first objective lens (7-1) and a second objective lens (7-2) are arranged so that the objective lens arrangement angle (20) at which the first and second objective lenses are arranged with respect to the shaft center of the sliding shaft (6) is displaced, by a predetermined amount, from the magnetic circuit arrangement angle (13) at which the magnetic substances (12) and the magnets (2) are arranged with respect to the shaft center of the sliding shaft (6).

Abstract translation: 本发明的目的是实现物镜驱动装置的薄型紧凑设计。 为了实现上述目的，光束（8）通过由跟踪线圈（4）围绕的空间和聚焦线圈（5），彼此相邻并固定在保持器（3）中。 此外，另一目的是将物镜高精度地定位在用于根据光盘的类型切换多个物镜的物镜驱动装置中。 为了实现该目的，在透镜保持架（3）上设置有在中心处与滑动轴（6）径向延伸的磁性物质（12-1）至（12-（4）），并且磁性物质 位于与构成磁隙的平面垂直的平面内，位于磁隙的外侧。另外，在物镜驱动装置中，另一个目的是防止物镜的位置偏移由于 为了实现这个目的，第一物镜（7-1）和第二物镜（7-2）被布置成使得第一和第二物镜（7-1）和第二物镜 透镜相对于滑动轴（6）的轴心从磁性物质（12）和磁体（2）的磁路配置角度（13）位移一定量， 相对于轴心o f滑动轴（6）。

公开(公告)号：EP0825594B1

公开(公告)日：2004-11-03

申请号：EP97114111.4

申请日：1997-08-14

Applicant: Hitachi, Ltd. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro

IPC: G11B7/09 ,  G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

公开(公告)号：EP0825594A2

公开(公告)日：1998-02-25

申请号：EP97114111.4

申请日：1997-08-14

Applicant: HITACHI, LTD. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro

IPC: G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam (8) is passed through a space surrounded by a tracking coil (4) and a focusing coil (5) which are adjacent to each other and fixed in a holder (3). Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances (12-1) to (12-(4) which are radially extended with the sliding shaft (6) at the center are provided in the lens holder (3), and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC. To achieve this object, a first objective lens (7-1) and a second objective lens (7-2) are arranged so that the objective lens arrangement angle (20) at which the first and second objective lenses are arranged with respect to the shaft center of the sliding shaft (6) is displaced, by a predetermined amount, from the magnetic circuit arrangement angle (13) at which the magnetic substances (12) and the magnets (2) are arranged with respect to the shaft center of the sliding shaft (6).

Abstract translation: 目的是实现物镜驱动装置的薄且紧凑的设计。 为了实现上述目的，光束（8）穿过彼此相邻并固定在支架（3）中的由跟踪线圈（4）和聚焦线圈（5）围绕的空间。 此外，另一个目的是将物镜高精度地定位在用于根据光盘的类型切换多个物镜的物镜驱动装置中。 为了实现该目的，在透镜保持器（3）中设置有以滑动轴（6）为中心在径向延伸的磁性体（12-1）〜（12-（4）），磁性体 位于与构成磁隙的平面垂直的平面内和磁隙的外侧，而且，在物镜驱动装置中，还有另一目的是防止物镜的阻力产生位置偏移 为了实现这个目的，第一物镜（7-1）和第二物镜（7-2）这样排列，使得物镜配置角（20）在第一和第二物镜 相对于滑动轴（6）的轴心布置的透镜从布置磁性体（12）和磁体（2）的磁路布置角度（13）移位预定量 尊重轴心o f滑动轴（6）。

公开(公告)号：EP1469462A2

公开(公告)日：2004-10-20

申请号：EP04017651.3

申请日：1997-08-14

Applicant: Hitachi, Ltd. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro

IPC: G11B7/09

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam (8) is passed through a space surrounded by a tracking coil (4) and a focusing coil (5) which are adjacent to each other and fixed in a holder (3). Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances (12-1) to (12-(4) which are radially extended with the sliding shaft (6) at the center are provided in the lens holder (3), and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC. To achieve this object, a first objective lens (7-1) and a second objective lens (7-2) are arranged so that the objective lens arrangement angle (20) at which the first and second objective lenses are arranged with respect to the shaft center of the sliding shaft (6) is displaced, by a predetermined amount, from the magnetic circuit arrangement angle (13) at which the magnetic substances (12) and the magnets (2) are arranged with respect to the shaft center of the sliding shaft (6).

公开(公告)号：EP0825594A3

公开(公告)日：1998-11-25

申请号：EP97114111.4

申请日：1997-08-14

Applicant: HITACHI, LTD. ,  Hitachi Media Electronics Co., Ltd.

Inventor： Inui, Shinro ,  Otoshi, Naohiko ,  Izumi, Katsuhiko ,  Miura, Michio ,  Kuroda, Naomitsu ,  Mizuno, Ryuichiro

IPC: G11B7/135

CPC classification number: G11B7/1374 ,  G11B7/093 ,  G11B7/0933 ,  G11B7/0935 ,  G11B2007/0006

Abstract: It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam (8) is passed through a space surrounded by a tracking coil (4) and a focusing coil (5) which are adjacent to each other and fixed in a holder (3). Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances (12-1) to (12-(4) which are radially extended with the sliding shaft (6) at the center are provided in the lens holder (3), and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC. To achieve this object, a first objective lens (7-1) and a second objective lens (7-2) are arranged so that the objective lens arrangement angle (20) at which the first and second objective lenses are arranged with respect to the shaft center of the sliding shaft (6) is displaced, by a predetermined amount, from the magnetic circuit arrangement angle (13) at which the magnetic substances (12) and the magnets (2) are arranged with respect to the shaft center of the sliding shaft (6).

Abstract translation: 本发明的目的是实现物镜驱动装置的薄型紧凑设计。 为了实现上述目的，光束（8）通过由跟踪线圈（4）围绕的空间和聚焦线圈（5），彼此相邻并固定在保持器（3）中。 此外，另一目的是将物镜高精度地定位在用于根据光盘的类型切换多个物镜的物镜驱动装置中。 为了实现该目的，在透镜保持架（3）上设置有在中心处与滑动轴（6）径向延伸的磁性物质（12-1）至（12-（4）），并且磁性物质 位于与构成磁隙的平面垂直的平面内，位于磁隙的外侧。另外，在物镜驱动装置中，另一个目的是防止物镜的位置偏移由于 为了实现这个目的，第一物镜（7-1）和第二物镜（7-2）被布置成使得第一和第二物镜（7-1）和第二物镜 透镜相对于滑动轴（6）的轴心从磁性物质（12）和磁体（2）的磁路配置角度（13）位移一定量， 相对于轴心o f滑动轴（6）。