| 摘要 |
<p>A lens optical system is provided with, in order from the object side, a first convex lens group (20) comprising multiple planarly disposed first convex lens elements (21), a second convex lens group (22) comprising multiple planarly disposed second convex lens elements (23), and a third convex lens group (24) comprising multiple planarly disposed third convex lens elements (25). The lens diameter and lens pitch of the convex lenses increase in the order of first convex lens group (20), second convex lens group (22), and third convex lens group (24). Further, the distance between the second convex lens group and the third convex lens group is greater than the distance between the first convex lens group and the second convex lens group.</p> |
