| 摘要 |
<p>An objective optical system for use in an optical pickup apparatus for converging first and second parallel light fluxes includes: a first lens group (L1) having a phase structure; and a second lens group (L2), wherein the first lens group and the second lens group are arranged in the objective optical system in this order from a longer conjugate distance side of the objective optical system, and a wavefront aberration of the first lens group W L1»1 , a wavefront aberration of the second lens group W L2»1 , a magnification of the second lens group M, a wavefront aberration of the second lens group W L2»2 , a wavefront aberration of the objective optical system W OBJ»2 are satisfy predescribed expressions.</p> |
