发明名称 |
Optical pickup apparatus, objective lens, apparatus for reproducing and/or recording optical information recording medium |
摘要 |
An optical pickup apparatus for at least two kinds of optical information recording media, comprises a first light source; a second light source; an optical converging system; and a photo detector. An optical element of the optical converging system comprises a first region including an optical axis and a second region adjoining the first region and locating at the outside of the first region, the first region is a refractive surface and the second region is a diffractive surface. When a first light flux passes through the second region, the light amount of n-th order diffracted ray of the first light flux is larger than that of any other order diffracted ray of the first light flux, and when a second light flux passes through the second region of the optical element, the light amount of n-th order diffracted ray of the second light flux is larger than that of any other order diffracted ray of the second light flux, where n is an integer except 0. <IMAGE> |
申请公布号 |
EP1158503(A3) |
申请公布日期 |
2004.04.14 |
申请号 |
EP20010304393 |
申请日期 |
2001.05.17 |
申请人 |
KONICA CORPORATION |
发明人 |
OTA, KOHEI;ARAI, NORIKAZU |
分类号 |
G02B3/08;G11B7/00;G11B7/125;G11B7/135 |
主分类号 |
G02B3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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