| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing optical system using blue laser light, in which a minor shape change occurring on an optical surface of an optical element with an antireflection film disposed at a high temperature is prevented and rim strength is improved. <P>SOLUTION: In an optical information recording/reproducing optical system having an optical element made from a resin and an object lens, the optical element and the object lens are made from materials having high temperature durability and, with regard to functional films disposed on optical surfaces of the optical element and the object lens, a certain level of restriction is applied to introduction of a thin film layer containing any element that relates to photocatalytic action. Furthermore, a functional film having prescribed reflection characteristics is given on a surface of the object lens opposite to an optical disk for the purpose of improving rim strength. <P>COPYRIGHT: (C)2012,JPO&INPIT |
