| 摘要 |
An optical disk device, for use with an optical disk, may include a laser light source, a photo-detector, and an optical system for structuring a forward path in which a laser beam is guided to the optical disk and a return path in which a return light beam is guided to the photo-detector. The optical system may further include a sensor lens which gives astigmatism to the return light beam to generate a focusing error signal by an astigmatism method. The optical disk device may be provided with an angular position adjusting mechanism for adjusting an angular position of the sensor lens around the optical axis of the sensor lens.
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