| 摘要 |
<p>Disclosed are an objective lens capable of suppressing defects at formation time in a lens with high NA and an optical pickup device. The lens uses a resin (PL) with an MFR of greater than or equal to 10 (g/10 min) and less than or equal to 70 (g/10 min), and therefore, from the initial state shown in FIG. 2(a) to the final state shown in FIG. 2(b), curing of the resin (PL) in the vicinity of a gate portion (GT) is suppressed, pressure of a runner (LN) side is conveyed to the resin (PL) within a cavity, and as a result, the resin (PL) is molded to a vicinity of a maximum thickening of a transfer plane (10a) of a first mold (10) having a small radius of curvature. Therefore, it is possible to acquire a high-precision optical surface.</p> |
