| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens unit and an imaging device capable of taking effective measures against ghosts while ensuring moldability and reliability.SOLUTION: In addition to a first tapered groove L2c provided in an image side surface of a flange portion L2a, a second tapered groove L2d is provided in an object side surface of the flange portion L2a, so that a function of capturing unnecessary light LB incident into a second lens L2 enhances and ghosts can be suppressed. On the other hand, the first tapered groove L2c and the second tapered groove L2d disposed at different positions in a direction orthogonal to an optical axis are relatively shallow, so that it is possible to set relatively large the distance between each of the tapered grooves L2c and L2d and the object side surface of the flange portion L2a. As a result, a local thickness difference of the second lens L2 is reduced, so that it is possible to prevent a flow of resin from being narrowed by a metal mold at a time of injection molding of the lens L2, suppress the generation of welds or the like, suppress degradation of releasability by averaging a transfer surface of the metal mold, and improve moldability. |
