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Optical pickup, optical element, and information reproducing apparatus configured for use with any of plural types of recording media
Optical pickup, optical element, and information reproducing apparatus configured for use with any of plural types of recording media
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机译:配置成与多种类型的记录介质中的任何一种一起使用的光学头,光学元件和信息再现设备
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摘要
An optical pickup has a light source for emitting a plurality of laser beams with different wavelengths; and an objective lens for focusing the laser beams emitted from the light source on recording surfaces of plural types of information recording media. A diffractive lens structure is provided in a light path of the laser beam, the structure including ring zone areas divided by a plurality of phase steps for correcting a wavefront aberration of the laser beam, a diameter of an outermost phase step of the diffractive lens structure is smaller than a second largest effective diameter of effective diameters required for reproduction of the plural types of information recording media.
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