发明授权
- 专利标题: Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens
- 专利标题(中): 光拾取器兼容数字通用光盘和使用全息环形透镜的可刻录光盘
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申请号: US49988申请日: 1998-03-30
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公开(公告)号: US6043912A公开(公告)日: 2000-03-28
- 发明人: Jang-Hoon Yoo , Chul-Woo Lee
- 申请人: Jang-Hoon Yoo , Chul-Woo Lee
- 申请人地址: KRX Suwon-city
- 专利权人: Samsung Electronics Co., Ltd.
- 当前专利权人: Samsung Electronics Co., Ltd.
- 当前专利权人地址: KRX Suwon-city
- 优先权: KRX97-11297 19970328
- 主分类号: G11B7/08
- IPC分类号: G11B7/08 ; G02B5/32 ; G11B7/00 ; G11B7/125 ; G11B7/135 ; G11B7/20
摘要:
An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the optical pickup apparatus including two laser light sources to emit light beams having the different wavelengths, respectively, a holographic lens, including a holographic ring, to transmittal of the light beams emitted from the laser light sources in an inner region of the holographic ring, and diffracting a specific light beam among the light beams emitted from the laser light sources in an outer region relative to the inner region, an objective lens to focus the light beams passed through the holographic ring lens on the respective information recording surfaces of the two types of the optical recording media, optical elements to alter optical paths of the light beams reflected from the information recording surfaces of the optical recording media; and two photodetectors to individually detect optical information from the light beams incident from the optical elements. The optical pickup apparatus is used compatibly with optical recording media by using the holographic lens to eliminate spherical aberration generated when an optical recording medium is changed to another medium having a different thickness, thereby providing advantages which include ease in construction of the holographic lens and good mass-production capabilities.
公开/授权文献
- USD385796S Sidewall for a bottle 公开/授权日:1997-11-04
信息查询
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