| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system information recording/reproducing device miniaturized by an integrated optical system capable of high speed tracking. SOLUTION: A beam from a laser diode 1 is reflected successively by beam splitter 3, member 4, vibration mirror 6 provided on a transparent substrate 2 to be converged on an optical disk 8 by an objective lens 7. The vibration mirror 6 is supported vibratably for a semiconductor substrate 5 by a torsion bar 15, and a change of a direction of its surface moves a spot formed on the optical disk 8 in the direction traversing a track. The beam containing information from the optical disk 8 transmits through the objective lens 7, vibration mirror 6, member 4 and beam splitter 3, and is reflected by the bottom surface of the transparent substrate 2, and astigmatism is imparted to the beam by a cylindrical reflection mirror 9, and the beam is separated to S polarization and P polarization by a polarizing beam splitter 10, and respective polarization are made incident on photodiode units 12, 13. |
