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:
Dec. 23, 2025
Filed:
Feb. 23, 2023
Coretronic Corporation, Hsin-Chu, TW;
Chi-Fu Liu, Hsin-chu, TW;
Tsung-Hsin Liao, Hsin-Chu, TW;
Kun-Liang Jao, Hsinchu, TW;
Hung-Yu Lin, Hsin-chu, TW;
Coretronic Corporation, Hsin-Chu, TW;
Abstract
A filter element and a projection device are provided. The filter element is configured on the transmission path of at least one light beam, and includes a substrate and a film. The film is located on a surface of the substrate, and includes a first area and a second area. The first area includes a center, corresponding to the central axis of the at least one light beam. The distance between the second area and the center of the first area is greater than the distance between any point in the first area and the center. The average thickness of the second area of the film is greater than the average thickness of the first area of the film. The filter element of the disclosure may still have a similar filter effect when the incident angle is relatively large.