Collimator lens system

US10705314B2 · kind B2 · utility

Assignee

• JIANGXI LIANCHUANG ELECTRONIC CO., LTD · CN

Inventors

• Xuming Liu · Beijing, CN
• Kemin Wang · Nanchang, CN
• Jiyong Zeng · Nanchang, CN
• Haojie Zeng · Nanchang, CN
• Yumin Bao · Nanchang, CN
• Weijian Chen · Nanchang, CN

Key dates

• Filing date: Apr 2, 2018
• Grant date: Jul 7, 2020
• Expiry date: Jun 30, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/0025
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A collimator lens system includes a first lens, a second lens, a third lens and a diaphragm from an object side to an image side of the system in turn along an optical axis, in which the first lens is of a positive focal power, and an object side surface thereof is convex; the second lens is of a negative focal power; the third lens is of a positive focal power, and an image side surface thereof is convex; optical centers of all the lenses are arranged along a same straight line, the system meets following formulas: f12>f3; (dn/dt)1<−50×10−6/° C.; (dn/dt)2<−50×10−6/° C.; (dn/dt)3>−10×10−6/° C., where f12 represents a combined focal length of the first and second lenses, f3 represents a focal length of the third lens, and (dn/dt)1, (dn/dt)2, and (dn/dt)3 represent change rates of refractive indices of the first lens, the second lens and the third lens with temperature, respectively.