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:
Jul. 08, 2025
Filed:
Nov. 20, 2018
Arcam Ab, Moelndal, SE;
Mattias Fager, Onsala, SE;
Arcam AB, Moelndal, SE;
Abstract
Provided is an electron beam source for generating an electron beam comprising a cathode, an anode and a grid for regulating an electron beam current. The cathode has a base and a protrusion with sidewalls and a top surface. The base surface and the top surface are essentially flat. The base surface and the top surface are arranged at a predetermined distance from each other. The base is larger than the protrusion. The electron beam source further comprising a control unit adapted for changing an applied voltage to the grid for switching a spot size of the electron beam on a target surface between at least a first a first spot size corresponding to emission from the top surface of the cathode only and to a second spot size corresponding to emission from the top surface and the base surface of the cathode.