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:
Feb. 12, 2019
Filed:
Nov. 25, 2014
Bolymedia Holdings Co. Ltd., Santa Clara, CA (US);
Xiaoping Hu, Shenzhen, CN;
BOLYMEDIA HOLDINGS CO. LTD., Santa Clara, CA (US);
Abstract
A Fresnel lens system, comprising at least two tooth faces located on the same light path; each of the tooth faces comprises at least one Fresnel unit, each Fresnel unit being a Fresnel refraction surface formed by an original curved surface; at least one of the two tooth faces is a complex Fresnel refraction surface or a filled Fresnel refraction surface, or the two tooth faces are at a same physical interface and an element located thereon has a reflective back surface. The Fresnel lens system can adequately utilize the advantage of thinness of Fresnel lens, thus better adjusting the light path without a significant increase in the thickness of the system.