| 摘要 |
An optical pickup objective lens system for collecting a laser beam emitted from a light source onto a recording surface of an optical recording medium includes three lenses having negative, positive and negative powers sequentially, or positive, negative and positive powers sequentially in the order from the side of the light source toward the optical recording medium. The three lenses are bonded to one another through two joint faces, and each of the two joint faces is formed into an aspherical shape. Thus, the chromatic aberration can be corrected satisfactorily. Especially, even when a laser beam having a short wavelength is used, the recording and replaying of information can be carried out reliably and stably.
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