公开(公告)号：US12019255B2

公开(公告)日：2024-06-25

申请号：US17202297

申请日：2021-03-15

Applicant: OTO PHOTONICS INC.

Inventor： Chien-Hsiang Hung ,  Sheng Wang Lin

IPC: G01J3/26 ,  G02B1/115 ,  G02B5/28

CPC classification number: G02B5/285 ,  G01J3/26 ,  G02B1/115

Abstract: An optical filtering assembly comprises a first interference film and a second interference film. The first interference film comprises multiple first film layers and multiple second film layers. The first film layers and the second film layers are alternately stacked. The second interference film comprises multiple third film layers and multiple fourth film layers. The third film layers and the fourth film layers are alternately stacked. An optical constant of the first film layers is same as an optical constant of the third film layers, and an optical constant of the second film layers is same as an optical constant of the fourth film layers, and an Optical Path Difference (OPD) produced in the first interference film is different from an OPD produced in the second interference film.