发明授权
- 专利标题: Optical pickup using objective lens compatible with a plurality of optical disks
- 专利标题(中): 使用与多个光盘兼容的物镜的光学拾取器
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申请号: US09198451申请日: 1998-11-24
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公开(公告)号: US06285646B1公开(公告)日: 2001-09-04
- 发明人: Jang-Hoon Yoo , Yong-Jae Lee , Pyong-Yong Seong , Chul-Woo Lee
- 申请人: Jang-Hoon Yoo , Yong-Jae Lee , Pyong-Yong Seong , Chul-Woo Lee
- 优先权: KR97-66390 19971205
- 主分类号: G11B700
- IPC分类号: G11B700
摘要:
An optical pickup device including an objective lens which is compatible with a plurality of optical disks of respectively different specifications, such as a digital versatile disk (DVD), a compact disk-recordable (CD-R) medium, a compact disk (CD) and a laser disk (LD). The optical pickup device includes a laser source to emit light, an objective lens to focus the light emitted from the laser source on respective information recording surfaces of a plurality of optical recording media as an optimal optical spot, and an optical detector to detect light reflected from the information recording surface of the optical recording medium on which the optical spot has been focused and transmitted through the objective lens. The objective lens includes a first lens area, a second lens area, and a third lens area to focus the light emitted from the laser source. The first lens area has an aspherical surface corresponding to a first optical recording medium and a second optical recording medium, the second lens area has an aspherical surface corresponding to the second optical recording medium, and the third lens area has an aspherical surface corresponding to the first optical recording medium. As a result, the optical pickup can be compatible with a plurality of the optical disks of a respectively different specification irrespective of the thickness of the disk.
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