| 摘要 |
PURPOSE:To miniaturize an optical head by transmitting laser light to a light converging means packaged on a slider floating on a recording, and reproducing surface by means of optical fiber. CONSTITUTION:An optical head part is divided into a fixed optical part 5 and a movable optical part 7. The optical part 7 is shifted to the direction of the diameter of an optical disk 1 which rotates the optical part 7 at high speed so as to execute track retrieval. The collimator light 6 of a laser 8, which is collimated by a collimator lens 11 is converged on the recording and reproducing surface 4 of the disk 1 through a converging lens 15 installed on the optical fiber 14. Reflected light from the disk 1 is totally reflected on a deflection beam splitter 9 by the operation of a lambda/4 board 10, and is made incident to a photodetector 13 through a cylindrical lens 12. The detector 13 detects a focus error signal by the astigmatism of the lens 12. Since the slider 16 floats at a floating height decided by the peripheral speed of the disk 1, the form of the slider 16 and the mass of the optical part 7 through the reproduction surface 4 and an air layer, out-of-focus occurs and a driving element 17 corrects the floating height. |
