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:
Apr. 22, 1980
Filed:
Dec. 19, 1978
Applicant:
Inventor:
Tadahiro Takigawa, Inagi, JP;
Assignee:
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2504 / ; 250358 ; 2191 / ;
Abstract
The diameter of an electron beam at a crossover point can be set to a predetermined value by adjusting a heater current through a heater of an electron gun and a voltage between an emitter of the electron gun and wehnelt electrode. The diameter of the electron beam incident onto an object to be exposed can be varied by varying the diameter of the electron beam at the crossover point. This can be done without adjusting an electron beam lens and deflection electrode of an electron beam exposing apparatus. The diameter of the electron beam incident onto an object to be exposed can be set to a predetermined value dependent upon a pattern to be described.