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:
May. 11, 2021
Filed:
May. 17, 2017
Zhejiang Sunny Optical Co., Ltd, Ningbo, CN;
Zhejiang Sunny Optical Co., Ltd, Zhejiang, CN;
Abstract
The present disclosure provides an ocular assembly. The ocular assembly including sequentially along an optical axis from an object side to an image side: a first lens with a positive refractive power has a convex object-side surface, and a second lens has a concave image-side surface, wherein at least one of the object-side surface of the first lens, an image-side surface of the first lens, an object-side surface of the second lens, and an image-side surface of the second lens is a Fresnel structure surface, wherein half of a maximal field-of-view HFOV of the ocular assembly satisfies: HFOV>40°, an axial distance TTL of the object-side surface of the first lens to the image plane and a total effective focal length f of the ocular assembly satisfy 1<TTL/f<1.5.