Imaging lens unit

摘要

Disclosed herein is an imaging lens unit, including: a first lens having a positive (+) power; a second lens having a negative (−) power; a third lens having power; a fourth lens having a negative (−) power; and a fifth lens having a negative (−) power, wherein the first lens, the second lens, the third lens, the fourth lens, and fifth lens are arranged in order from an object to be formed as an image, and the fourth lens is convex toward an image side.

主权项

1. An imaging lens unit, comprising:
a first lens having positive (+) power; a second lens having negative (−) power of which an object-side surface is concave; a third lens having positive (+) or negative (−) power; a fourth lens having negative (−) power; and a fifth lens having negative (−) power, wherein the first lens, the second lens, the third lens, the fourth lens, and fifth lens are arranged in order from an object to be formed as an image, the fourth lens is a meniscus-shaped lens having a concave object-side surface in a proximity of an optical axis of the fourth lens and a convex image-side surface in a proximity of the optical axis of the fourth lens, and a distance tt from a vertex of the first lens at the object side to the image side and an image height (a diagonal length of an effective image surface) 2Y satisfy the following conditional expression:
0.68