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:
Mar. 01, 1988
Filed:
Dec. 19, 1986
Applicant:
Inventors:
Mineo Gotou, Kawasaki, JP;
Hideo Kusakabe, Chiba, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
2504922 ; 364490 ;
Abstract
The data in a counter in which a tolerable displacement of a table during the drawing in a sub-field and a movement of the table are compared in comparator. When the table movement exceeds a predetermined tolerable displacement preset in circuit for table movement correction, a signal for interrupting the pattern drawing is transferred to a control section. The main deflection position and the correction data for minor deflection distortion are set anew by a computer. Then, drawing of the remaining patterns is restarted.