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:
Sep. 24, 1985
Filed:
May. 03, 1984
Enso-Gutzeit Oy, Helsinki, FI;
Abstract
The invention concerns a procedure and a means for creating an electron curtain (5) intended to be used in irradiating a surface (8) and adjustable as to its intensity distribution. The electron curtain is elicited by producing with an elongated filament (2) placed in a chamber (1), free electrons in a space (6) surrounding the filament, by accelerating the electrons by means of an electrode structure (3) confining the space and by directing the electron curtain formed by the accelerated electrons out from the chamber through a window (4) permeable to electrons in its wall. It is a substantial novelty in the invention that regulation of the intensity distribution of the electron curtain (5) takes place by use of an elongated body (9) of magnetically soft material and of a row of magnets constituted by magnets (10) placed side by side, one of the two being disposed substantially parallelling the filament (2) behind the filament as seen from the direction of the window (4) of the chamber (1) and the other being disposed outside the window of the chamber before the electron curtain, the basis for the regulation achievable with the magnets being the absorption, dependent on the strength of the magnetic field, of electrons in the electrode structure (3). The magnets (10) being functionally independent of each other, the intensity of the electron curtain can be adjusted to be uniform or to vary as desired at different points of the curtain.