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:
Dec. 10, 2024
Filed:
Oct. 31, 2019
Hitachi High-tech Corporation, Tokyo, JP;
Takashi Ohshima, Tokyo, JP;
Hideo Morishita, Tokyo, JP;
Tatsuro Ide, Tokyo, JP;
Naohiro Kohmu, Tokyo, JP;
Momoyo Enyama, Tokyo, JP;
Yoichi Ose, Tokyo, JP;
Toshihide Agemura, Tokyo, JP;
Junichi Katane, Tokyo, JP;
HITACHI HIGH-TECH CORPORATION, Tokyo, JP;
Abstract
An electron beam emitted from a photoexcited electron gun is increased in luminance. An electron gunincludes: a photocathodeincluding a substrateand a photoelectric film; a light sourcethat emits pulsed excitation light; a condenser lensthat focuses the pulsed excitation light toward the photocathode; and an extractor electrodethat faces the photocathode and that accelerates an electron beam generated from the photoelectric film by focusing the pulsed excitation light by the condenser lens, transmitting the pulsed excitation light through the substrate of the photocathode, and causing the pulsed excitation light to be incident on the photocathode. The pulsed excitation light is condensed at different timings at different positions on the photoelectric film of the photocathode.