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:
Nov. 24, 2020
Filed:
Jun. 11, 2019
Hitachi High-tech Corporation, Tokyo, JP;
Shinichi Murakami, Tokyo, JP;
Wen Li, Tokyo, JP;
Hiroyuki Takahashi, Tokyo, JP;
Masazumi Tone, Tokyo, JP;
HITACHI HIGH-TECH CORPORATION, Tokyo, JP;
Abstract
In a charged particle beam control device, irradiation accuracy of an electron beam can be prevented from deteriorating due to a variation in a ground potential. A current control circuit () includes a current conversion unit () that supplies a constant current (Id) by adjusting an amount of a current flowing through a current detection resistor (R) based on a control signal (V), a differential amplification unit () to which a voltage of a first ground side terminal (G) of the control signal and a voltage of a second ground side terminal (G) of the current detection resistor (R) are input, and that outputs an output signal (V) proportional to a voltage difference between the voltage of the first ground side terminal (G) and the voltage of the second ground side terminal (G), and a correction unit () to which the output signal (V) output from the differential amplification unit () and the control signal (V) are input, and that adds the output signal (V) to the control signal (V) at a predetermined ratio.