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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.:

US 12297528 B1

PDFFull Text
Date of Patent:
May. 13, 2025

Filed:

Jun. 24, 2020

Optical film, sputtering target, and method of producing optical film

Applicant:

Sumitomo Metal Mining Co., Ltd, Tokyo, JP;

Inventor:

Hideharu Okami, Niihama, JP;

Assignee:

SUMITOMO METAL MINING CO., LTD., Tokyo, JP;

Attorney:

Kratz, Quintos & Hanson, LLP

Primary Examiner:

Thong Q Nguyen

Int. Cl.
CPC ...
G02B 5/20 (2006.01); C03C 17/245 (2006.01); C03C 17/34 (2006.01); C23C 14/00 (2006.01); C23C 14/08 (2006.01); C23C 14/34 (2006.01); C23C 14/35 (2006.01); C23C 14/54 (2006.01); H01J 37/34 (2006.01); C23C 4/08 (2016.01); C23C 4/134 (2016.01);
U.S. Cl.
CPC ...
C23C 14/3414 (2013.01); C03C 17/245 (2013.01); C03C 17/3417 (2013.01); C23C 14/0042 (2013.01); C23C 14/0094 (2013.01); C23C 14/083 (2013.01); C23C 14/352 (2013.01); C23C 14/548 (2013.01); G02B 5/208 (2013.01); H01J 37/3423 (2013.01); H01J 37/3429 (2013.01); H01J 37/3464 (2013.01); C03C 2217/228 (2013.01); C03C 2218/155 (2013.01); C03C 2218/156 (2013.01); C23C 4/08 (2013.01); C23C 4/134 (2016.01); H01J 2237/332 (2013.01);
Abstract

Provided is an optical film (composite tungsten oxide film containing cesium, tungsten, and oxygen), a sputtering target, and a method of producing an optical 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, characterized in that the optical film comprises cesium, tungsten, and oxygen, and a refractive index n and an extinction coefficient k of the optical film at each of wavelengths [300 nm, 350 nm, 400 nm, 450 nm, . . . , 1700 nm] specified at 50 nm intervals in a wavelength region from 300 nm to 1700 nm are set respectively within specified numerical ranges.

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