公开(公告)号：US5903536A

公开(公告)日：1999-05-11

申请号：US800395

申请日：1997-02-14

Applicant: Chul-Woo Lee ,  Jang-Hoon Yoo

Inventor： Chul-Woo Lee ,  Jang-Hoon Yoo

IPC: G11B7/08 ,  G01S19/14 ,  G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  G11B19/12

CPC classification number: G11B7/1353 ,  G11B19/12 ,  G11B7/0945 ,  G11B7/131 ,  G11B7/1365 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B7/0909

Abstract: An objective lens for reproducing/recording information from/onto discs having different thicknesses and an optical pickup device adopting the same. The objective lens device includes an objective lens provided along a light path facing a plane of a disc and having a predetermined effective diameter, and a light controller provided along the light path for controlling the light of an incident light beam between near and far axes of the objective lens, wherein the central portion of the objective lens corresponding to the near-axis region of the incident light beam has the optimum curvature and aspherical coefficient for both thick and thin discs. Therefore, the objective lens device is simplified and inexpensive. Also, the objective lens device can be used for discs of different thicknesses in a single disc drive, by reducing the spherical aberration effect.

Abstract translation: 用于从具有不同厚度的光盘/光盘上再现/记录信息的物镜和采用该物镜的光学拾取装置。 物镜装置包括：物镜，沿着与盘的平面相对的光路设置并具有预定的有效直径;以及沿着光路设置的光控制器，用于控制入射光束的近轴和远轴之间的光线 物镜，其中对应于入射光束的近轴区域的物镜的中心部分对于厚盘和薄盘具有最佳曲率和非球面系数。 因此，物镜装置被简化和便宜。 而且，通过减小球面像差效应，物镜装置可以用于单个盘驱动器中不同厚度的盘。

公开(公告)号：US5822135A

公开(公告)日：1998-10-13

申请号：US640474

申请日：1996-05-01

Applicant: Chul-woo Lee ,  Dong-ho Shin ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Pyong-yong Seong ,  Jang-hoon Yoo ,  Yong-hoon Lee

Inventor： Chul-woo Lee ,  Dong-ho Shin ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Pyong-yong Seong ,  Jang-hoon Yoo ,  Yong-hoon Lee

IPC: B29D11/00 ,  G02B3/10 ,  G02B27/58 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G02B9/00

CPC classification number: G11B7/1353 ,  B29D11/00009 ,  G02B27/58 ,  G02B3/10 ,  G11B7/0909 ,  G11B7/133 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/1381 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727 ,  G11B7/0045 ,  G11B7/005 ,  Y10S425/808

Abstract: A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

公开(公告)号：US5737299A

公开(公告)日：1998-04-07

申请号：US733970

申请日：1996-10-18

Applicant: Jang-hoon Yoo ,  Chul-woo Lee

Inventor： Jang-hoon Yoo ,  Chul-woo Lee

IPC: G02B5/30 ,  G02B27/58 ,  G11B7/135 ,  G11B7/00

CPC classification number: G11B7/1367 ,  G02B27/58 ,  G02B5/3083

Abstract: An optical pickup apparatus which can reduce effective size of an optical spot focused on an optical recording medium is provided. The optical pickup apparatus, in which a light beam emitted from a light source is focused on an optical medium for recording a signal on the optical medium and reproducing the signal from the optical medium, includes an objective lens for focusing the light beam on the surface of the optical medium and focusing a beam reflected from the surface of the optical medium, and two or more wave plates each having a different optical axis direction and located on an optical path between the light source and the objective lens. As a result, the spot size and the intensity of a first side lobe can be decreased, and the spot size can be adjusted according to the recording and reproducing modes.

Abstract translation: 提供一种可以减少聚焦在光记录介质上的光点的有效尺寸的光拾取装置。 其中从光源发射的光束聚焦在用于在光学介质上记录信号并从光学介质再现信号的光学介质上的光学拾取装置包括用于将光束聚焦在表面上的物镜 并且聚焦从光学介质的表面反射的光束，以及两个或更多个波片，每个波片具有不同的光轴方向并且位于光源和物镜之间的光路上。 结果，可以减小第一旁瓣的光斑尺寸和强度，并且可以根据记录和再现模式来调整光斑尺寸。

公开(公告)号：US5557597A

公开(公告)日：1996-09-17

申请号：US357240

申请日：1994-12-13

Applicant: Chul-woo Lee ,  Jang-hoon Yoo

Inventor： Chul-woo Lee ,  Jang-hoon Yoo

IPC: G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC classification number: G11B7/131 ,  G11B7/0912 ,  G11B7/1372 ,  G11B7/0943

Abstract: A focus error detector for detecting a signal representing a degree of a focus error of an objective lens with respect to an optical disk includes two focusing lenses each for focusing the reflected light of the optical disk by splitting the reflected light into two beams with respect to the optical axis and two photo-detectors for receiving the respectively focused beams, which simplifies necessary components for a beam size method. The two focusing lenses whose focal lengths are different from each other does not necessitate use of a beam splitter, thereby contributing to reduction of necessary components and optimizing the arrangement of the components. Also, the operational stability is secured by removing the sensitivity to the tilt and shift of an optical axis.

Abstract translation: 用于检测表示物镜相对于光盘的聚焦误差程度的信号的聚焦误差检测器包括两个聚焦透镜，每个聚焦透镜用于通过将反射光分成两束相对于 光轴和两个用于接收分别聚焦的光束的光电检测器，这简化了用于光束尺寸方法的必要部件。 焦距彼此不同的两个聚焦透镜不需要使用分束器，从而有助于减少必要的部件并优化部件的布置。 此外，通过消除对光轴的倾斜和偏移的灵敏度来确保操作稳定性。