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1. (WO2018218856) IMAGING LENS SET

Pub. No.:    WO/2018/218856    International Application No.:    PCT/CN2017/107332
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Tue Oct 24 01:59:59 CEST 2017
IPC: G02B 13/00
Applicants: ZHEJIANG SUNNY OPTICAL CO., LTD
浙江舜宇光学有限公司
Inventors: LI, Ming
李明
ZHANG, Kaiyuan
张凯元
Title: IMAGING LENS SET
Abstract:
An imaging lens set, comprising in sequence from an object side to an imaging side along an optical axis a first lens group and a second lens group, wherein the first lens group has positive focal power and the second lens group has negative focal power. The first lens group comprises in sequence from the object side to the imaging side along the optical axis a first lens (E1), a second lens (E2) and a third lens (E3), wherein the first lens (E1) has positive focal power and the object side surface of the first lens (S1) is a convex surface; the second lens (E2) has negative focal power; and the third lens (E3) has positive focal power or negative focal power. The second lens group comprises in sequence from the object side to the imaging side along the optical axis a fourth lens (E4) and a fifth lens (E5), wherein the fourth lens (E4) has negative focal power and the fifth lens (E5) has positive focal power or negative focal power, and the object side surface of the fifth lens (S9) is a convex surface at a paraxial position. An effective focal length f of the imaging lens set and a combined focal length f45 of the fourth lens (E4) and the fifth lens (E5) satisfy: -1.0≤f/f45≤-0.5. With reasonable allocation of focal power and face type of various lens, and of an on-axis distance between every two lens, the imaging lens set can achieve good imaging quality on the premise of miniaturization.