| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical system and an optical element in which a refraction power in a diffraction plane of a diffraction optical part is alleviated so as to suppress a flare due to unnecessary diffraction light by making other optical elements in a diffraction optical element share an effect of reducing chromatic aberration contained in the diffraction optical element itself and an aspheric lens effect, as a further improvement of a conventional technology. <P>SOLUTION: The optical element is formed by joining the diffraction optical section formed by laminating a plurality of diffraction gratings, and a refraction optical section comprising a solid material having an abnormal partial dispersion characteristic. The refraction optical section includes an optical plane which is not joined to the diffraction optical section, exposed to the air, and has an aspherical shape. <P>COPYRIGHT: (C)2013,JPO&INPIT |
