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:
Oct. 21, 2025
Filed:
Jun. 24, 2020
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Hideharu Okami, Niihama, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
Provided is an optical film (a composite tungsten oxide film containing cesium, tungsten, and oxygen), a sputtering target, and a method of producing a film by which film formation conditions can be easily obtained. An optical film of the present invention has transmissivity in a visible wavelength band, has absorbance in a near-infrared wavelength band, and has radio wave transparency, and is characterized in that the optical film comprises cesium, tungsten, and oxygen, in which a refractive index n and an extinction coefficient k of the optical film at each of 300 nm and wavelengths [400 nm, 600 nm, . . . , 2400 nm] specified at 200 nm intervals in a wavelength region from 400 nm to 2400 nm are set within a range between 'n-max' and “n-min” made by graphing the maximum value and the minimum value of the refractive index in a wavelength dispersion graph of optical constants shown in FIG.and within a range between “k-max” and “k-min” made by graphing the maximum value and the minimum value of the extinction coefficient in the above wavelength dispersion graph of optical constants.