| 摘要 |
PURPOSE:To secure an optical path length and to miniaturize and lighten a device in an optical pickup used for an optical information recorder. CONSTITUTION:This pickup is constituted of a glass element 14 where a hologram optical element 15 being a first reflection surface and a condensing grating lens 16 they are arranged on the same surface are formed integrally so as to oppose to a second reflection surface 17 and a semiconductor laser 1 and a multidivision photodetector 20 sticking and fixing a grating 19 by a LiNbO3 substrate 18 made by proton exchange and resin 21 integrally. Then, by reciprocating an outgoing beam from the semiconductor laser 1 and a reflection beam from a disk 7 between two reflection surfaces opposing to each other, the optical path length is secured and all components are constituted integrally and the device is miniaturized and lightened. |
