The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 2021
Filed:
Apr. 02, 2018
Jiangxi Lianyi Optics Co., Ltd., Nanchang, CN;
Xuming Liu, Nanchang, CN;
Haojie Zeng, Nanchang, CN;
Yumin Bao, Nanchang, CN;
Weijian Chen, Nanchang, CN;
Jiyong Zeng, Nanchang, CN;
JIANGXI LIANYI OPTICE CO., LTD., Nanching, CN;
Abstract
The disclosure provides a collimating lens. In order from a laser transmitter side to a to-be-measured object side, the collimating lens includes a first lens, a second lens, a third lens, a fourth lens and an aperture stop. The aperture stop is on the to-be-measured object side, and optical centers of each lens being on a same line. The collimating lens satisfying the following conditions: (dn/dt)1<−50×10/° C., (dn/dt)2<−50×10/° C., (dn/dt)3<−50×10/° C., (dn/dt)4>−10×10/° C. A refractive index of each lens is usually distributed reasonably with temperature, the focal length can be stabilized and applied to different temperature occasion. Under the same size laser emitter, the focal length of the system is larger, and the field of view angle is smaller.