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. 06, 2021
Filed:
Feb. 12, 2019
Zhejiang Sunny Optical Co., Ltd, Ningbo, CN;
Xinquan Wang, Ningbo, CN;
Lin Huang, Ningbo, CN;
ZHEJIANG SUNNY OPTICAL CO., LTD, Ningbo, CN;
Abstract
The present disclosure discloses an optical imaging system. The optical imaging system includes, sequentially along an optical axis from an object side to an image side: a first lens to a fourth lens. The first lens, the third lens, and the fourth lens each has a positive refractive power or a negative refractive power. The second lens has a positive refractive power, and an image-side surface of the second lens is a concave surface. An image-side surface of the fourth lens is a concave surface. An effective half-diameter DT11 of an object-side surface of the first lens, an effective half-diameter DT21 of an object-side surface of the second lens, an effective half-diameter DT32 of an image-side surface of the third lens, an effective half-diameter DT42 of the image-side surface of the fourth lens and an entrance pupil diameter EPD of the optical imaging system satisfy: (DT11+DT21+DT32+DT42)/EPD≤2.4.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile