| 摘要 |
<p>It is to provide an imaging lens that can sufficiently handle the demands for reduction in size and weight and further improvement in the optical performance, e.g. for mobile phones or the like. The imaging lens comprises, in order from the object towards the image side (7), a diaphragm (2), a first lens (3) which is a meniscus lens having positive power, the convex surface of which faces the object, and a second lens (4) which is a lens having positive power, the convex surface of which faces the image, wherein conditions expressed by each of following inequalities (1)-(6) are to be satisfied;
1.25‰¥L/fl‰¥0.8, 1‰¥f 1 /f 2 ‰¥0.2, 1.8‰¥f 1 /fl‰¥1, 0.5>d 2 /d 1 ‰¥0.2,
0.35‰¥d 1 /fl‰¥0.1, and 0.27‰¥d 3 /fl‰¥0.1 (where, L: entire length of the lens system, fl: focal distance of the entire lens system, f 1 : focal distance of the first lens, f 2 : focal distance of the second lens, d 1 : center thickness of the first lens, d 2 : space between the first lens and the second lens on the optical axis, and d 3 : center thickness of the second lens).</p> |
