OBJECTIVE LENS AND OPTICAL PICKUP APPARATUS

摘要

The present invention provides an objective lens for use in an optical pickup apparatus for recording and/or reproducing information on an optical information recording medium using holography. The objective lens includes: a plurality of lens groups including three or more lens groups. In the objective lens, a first lens group closest to a light source of the optical pickup apparatus, includes an optical surface closest to the light source which is convex to a light source side.