| 摘要 |
PURPOSE:To make one package or an optical system to miniaturize the optical system by using a glass polarizing plate as the analyzer in an optical element to miniaturize the analyzer very much. CONSTITUTION:A heat sink 15 is arranged in the center of a pedestal 16 of the optical element, and a semiconductor laser 14 is bonded to it by die bonding. Substrates 13A and 13B on which four photodetectors are formed are mounted on both sides of the pedestal 16, and glass polarizing plates 11A and 11B are adhered by a resin 12 hardened by ultraviolet rays so that light reception faces of photodetectors are covered with them. The light of the semiconductor laser 14 is reflected by a magnetic storage medium, and diffracted light due to diffracting means 17A and 17B is received by photodetectors, and information is reproduced from difference signals. Since glass polarizing plates are used in this manner, warp or distortion does not occur at the time of working, and the analyzer whose length and width are 1mm or shorter is formed to miniaturize the optical system. |
