| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a shape-variable element capable of favorably correcting color aberration and various aberrations. <P>SOLUTION: This shape-variable element comprises a plurality of optical materials and can change the shape of at least one surface. At least one of the plurality of optical materials constituting the shape-variable element satisfies the following expression, ¾θgF-(1.665×10<SP POS="POST">-7</SP>×νd<SP POS="POST">3</SP>+5.213×10<SP POS="POST">-5</SP>×νd<SP POS="POST">2</SP>-5.656×10<SP POS="POST">-3</SP>×νd+0.7278)¾>0.0272. Where νd represents an Abbe number related to d line, θgF represents a partial dispersion ratio related to g line and F line, and assuming that ng, nF, nd, and nC are defined as indices of refraction related to g line, F line, d line and C line, νd=(nd-1)/(nF-nC) and θgF=(ng-nF)/(nF-nC). <P>COPYRIGHT: (C)2012,JPO&INPIT |
