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发明授权
CN1855254B 光拾取装置 失效 - 权利终止

光拾取装置
摘要：
本发明揭示一种光拾取装置，光路耦合构件(104)使最短波长的第1波长光和最长波长的第3波长光的向聚焦构件(105)方向的光轴一致，衍射元件(103)将第1波长光的±2级衍射光、以及第2波长光和第3波长光的±1级衍射光作为来自光信息记录媒体(106)的信号光，使第1波长光的+2级衍射光、以及第2波长光和第3波长光的+1级衍射光聚焦于第1光检测器(102A)，使第1波长光的-2级衍射光和第3波长光的-1级衍射光聚焦于第2光检测器(102BD)，使余下的第2波长光的-1级衍射光聚焦于光检测器(102C)。这样使整个装置小型化。
摘要（英）：

An optical path coupling member aligns an optical axis directed to a light condensing member of the first wavelength light having a shortest wavelength with that of the third wavelength light having alongest wavelength. A diffraction element condenses +2nd order diffracted light of the first wavelength light and +1st order diffracted light of the second wavelength light and third wavelength lightinto a first photodetector, the -2nd order diffracted light of the first wavelength light and -1st order diffracted light of the third wavelength light into a second photodetector, and -1st order diffracted light of the remaining second wavelength light into a photodetector, using +-2nd order diffracted light of the first wavelength light and +-1st order diffracted light of the second wavelengthlight and third wavelength light as signal light from an optical information recording medium. Consequently, the overall size of the optical pickup apparatus is reduced.

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