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:
Aug. 19, 2025
Filed:
Jun. 16, 2022
Guangzhou Tyrafos Semiconductor Technologies Co., Ltd., Guangzhou, CN;
Guangzhou Tyrafos Semiconductor Technologies Co., Ltd., Guangzhou, CN;
Abstract
A surface light source projection device with improved zero-order diffraction includes a light exit module and a diffractive optical module. The diffractive optical module has two micron diffraction layers, the micron diffraction layers include a plurality of microstructures. Each of the microstructures has a circular perimeter and is provided with a recess having an opening inside the circular perimeter. The outer diameter of each of the microstructures is between 5 times and 200 times the incident wavelength of an incident light beam, and the outer diameter of the recess is between 0.3 and 0.7 times the outer diameter of each microstructure.