Collimator lens

US10488674B2 · 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: Nov 26, 2019
• Expiry date: Jun 21, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B11/25
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A collimator lens includes a first lens, a second lens and a diaphragm from an object side to an image side of the assembly 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 positive focal power, and an image side surface thereof is convex; optical centers of the first lens and the second lens are arranged along a same straight line, the system meets following formulas: f1>f2; (dn/dt)1<−50×10−6/° C.; (dn/dt)2>−10×10−6/° C., where f1 represents a focal length of the first lens, f2 represents a focal length of the second lens, (dn/dt)1 represents a change rate of a refractive index of the first lens with temperature, and (dn/dt)2 represents a change rate of a refractive index of the second lens with temperature.