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. 19, 2023
Filed:
Jul. 01, 2021
Optical Coatings Japan, Gotemba, JP;
OPTICAL COATINGS JAPAN, Gotemba, JP;
Abstract
Provide is an ultraviolet ray transmissive filter in which a crystal structure of a hafnium oxide layer is controlled to improve the light resistance of an optical interference film, and which can suppress reduction of the transmissivity in a transmission band even under long-term irradiation with ultraviolet rays. The optical interference film includes the hafnium oxide layer, and in the crystal structure of the hafnium oxide layer, spectral peak intensities from X-ray diffraction which are derived from the orthorhombic crystal structure and a tetragonal crystal structure are lower than a spectral peak intensity from X-ray diffraction which is derived from the monoclinic crystal structure.