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:
Aug. 22, 2023
Filed:
Jun. 20, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Koji Embutsu, Musashino, JP;
Nobutatsu Koshobu, Musashino, JP;
Ryoichi Kasahara, Musashino, JP;
Takeshi Umeki, Musashino, JP;
Osamu Tadanaga, Musashino, JP;
Takushi Kazama, Musashino, JP;
Takahiro Kashiwazaki, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
A wavelength conversion device that restrains output power of light when a temperature of a wavelength conversion element, including a ferroelectric substrate, is changed. The wavelength conversion device includes, in a casing, the wavelength conversion element, a temperature control element that controls a temperature of the wavelength conversion element, a static elimination mechanism, and a surface potential measurement mechanism, and eliminates static electricity by driving the static elimination mechanism when the surface potential measurement mechanism detects a change in surface potential of the wavelength conversion element.