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:
Sep. 26, 2017
Filed:
Apr. 16, 2014
Hangzhou Great Star Tools Co., Ltd. and Hangzhou Great Star Industrial Co., Ltd., Hangzhou, Zhejiang, CN;
Wentian Yu, Hangzhou, CN;
Abstract
A lens has a front surface, a rear surface, a side surface extending between the front surface and the rear surface. The rear surface defines a rear-facing chamber. The front surface has a central surface and an edge surface connected in a surrounding manner with the central surface, and the edge surface extends between the central surface and the side surface. The lens is an axisymmetric body and defines a central axis. The lens cooperates with the LED light source or similar light source which are located at the central axis and can move within the chamber, to form a lens system, so as to achieve a high capacity factor of the emergent light emitted from the light source, and functions of collimating and focusing for the incident light. This lens system can be applied to a flashlight with the function of variable focus.