| 摘要 |
<p>An optical communication lens (20) for condensing light flux emitted from an optical element or an optical fiber is a single lens formed from a plastic material, and has an optical-fiber-side optical surface (S2 surface) having a diffraction structure (D) for correcting focus-position fluctuations caused by temperature changes, and an opposite-optical-fiber-side optical surface (S1 surface) which is convex. The optical communication lens (20) is characterized by satisfying these formulas:φSF>φSL (1);│SgFmax-SgFmin│<0.05 (2). Additionally,φSF: effective diameter (mm) of optical-fiber-side optical surface;φSL: effective diameter (mm) of opposite-optical-fiber-side optical surface; SgFmax: maximum sag (mm) of optical-fiber-side optical surface; SgFmin: minimum sag (mm) of optical-fiber-side optical surface.</p> |
