| 摘要 |
<p>An objective lens capable of recording or reproducing informations of HD, DVD and CD is provided. <??>A reference lens 2a and a close-contact lens 2b are closely in contact and bonded, the material of the close-contact lens 2b is different from the material of the reference lens 2a, a lens surface of the reference lens and a lens surface of the close-contact lens have aspherical shapes, the reference lens has a light-converging function, and the close-contact lens has a region providing a positive refractive power and a region providing a negative refractive power to construct an objective lens for optical information recording media. <IMAGE></p> |
