| 摘要 |
PURPOSE:To obtain a multibeam optical head in which optical path length can be reduced and is equipped with a beam string rotating mechanism with superior responsiveness and high definition. CONSTITUTION:An optical recording medium 7 is irradiated with a beam string consisting of multibeams by a multibeam semiconductor laser 1, a collimator lens 2, a polarizating beam splitter 3, a wavelength plate 4, a 45 deg. rectangular prism 5, and an objective lens 6. In the multibeam optical head, the 45 deg. rectangular prism 5 which reflects the multibeam and bends its optical path is placed on a rocking mechanism 11, and the 45 deg. rectangular prism 5 is rocked around the optical axis O1 of the objective lens 6, and the beam string is rotated. |
