- 专利标题： Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
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申请号： US11976062申请日： 2007-10-19
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公开(公告)号： US07924681B2公开(公告)日： 2011-04-12
- 发明人: Norikazu Arai , Toshiyuki Kojima , Toshihiko Kiriki , Kohei Ota , Shinichiro Saito
- 申请人： Norikazu Arai , Toshiyuki Kojima , Toshihiko Kiriki , Kohei Ota , Shinichiro Saito
- 申请人地址： JP Tokyo
- 专利权人： Konica Corporation
- 当前专利权人： Konica Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- 优先权： JP11015010 19990122; JP11041925 19990219; JP11095347 19990401; JP11097480 19990405; JP11257466 19990910; JP11312701 19991102
- 主分类号： G11B7/135
- IPC分类号： G11B7/135 ; G02B3/10
摘要：
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source for emitting first light flux having a first wavelength; a second light source for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system having an optical axis and a diffractive portion, and a photo detector; wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted ray of the second light flux, where n stands for an integer other than zero.
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