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:
Nov. 12, 2019
Filed:
Nov. 17, 2017
Facebook Technologies, Llc, Menlo Park, CA (US);
Kurt Jenkins, Sammamish, WA (US);
Shizhe Shen, Foster City, CA (US);
Facebook Technologies, LLC, Menlo Park, CA (US);
Abstract
A method for preparing a die for molding of a Fresnel lens includes obtaining a first die block that defines at least one or more portions of a Fresnel lens. The one or more portions defined in the first die block correspond to a plurality of slope facets and a plurality of draft facets. The method also includes adding textures to one or more portions of the first die block that correspond to at least a portion of the plurality of draft facets. A method of making a Fresnel lens includes obtaining the first die block, obtaining a second die block, and coupling the first and the second die blocks. The method also includes providing a molding material into a space defined between the first and the second die blocks, curing the molding material, and removing the Fresnel lens from the first and/or the second die block.