| 摘要 |
Provided is a lens unit which can be manufactured by precise alignment by using a simple method, even if there is some dimensional difference in a plurality of optical elements. Pairs of contact parts (protruding parts (11a) and groove parts (11b, 12b, 13b) which are provided respectively to three positioning parts (11, 12, 13) regulate the relative movement of a plurality of single lenses (21, 22) in relation to: the direction of the optical axis (AX); and specific limited directions (P1, P2, P3) around the central axis that are on a plane which is orthogonal to the optical axis (AX). The three positioning parts (11, 12, 13) are formed such that the specific limited directions (P1, P2, P3) differ from one another. Therefore, precise positioning is possible, not only in relation to the direction of the optical axis (AX) and the direction of the plane which is orthogonal to the optical axis (AX), but also in relation to rotation around the central axis. |
