| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a liquid crystal optical element surely functioning as a diffraction element, and an optical pickup device using such a liquid crystal optical element. <P>SOLUTION: The liquid crystal optical element 45 includes a transparent electrode 100 arranged on one of a pair of transparent substrates 31 and 36 and having a diffraction pattern, a liquid crystal panel 30 having a transparent counter electrode 32 arranged on the other of the pair of transparent substrates, and a driving part 40 for generating a phase difference distribution in a liquid crystal layer 37 by generating a potential difference between the transparent electrode and the transparent counter electrode and causing the liquid crystal panel to function as a diffraction element for diffracting a transmitted return optical beam, wherein the driving part adjusts a potential difference in each area by dividing the diffraction pattern into a plurality of areas. The optical pickup device 10 has such a liquid crystal element. <P>COPYRIGHT: (C)2010,JPO&INPIT |
