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. 15, 1986
Filed:
Sep. 27, 1983
Hiroshi Yasuda, Yokohama, JP;
Haruo Tsuchikawa, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a D/A converter in a deflection system of an electron beam exposure device, the most significant bits (m bits) of input digital data consisting of n bits are input into a decoder circuit, and 2.sup.m D/A converters which correspond to the m bits are provided. The data consisting of the least significant bits (n-m bits) is input into the 2.sup.m D/A converters via 2.sup.m gates, respectively. The decoder circuit is constructed so as to control the 2.sup.m gates so that when the content of the data of the m bits is S, the first to S-th data of the 2.sup.m D/A converters is all rendered to be '1', the data of the (S+1)-th D/A converter remains the same as the data of the n-m bits, and the data of the (S+2)-th and subsequent D/A converters is all rendered to be '0', the sum of the outputs of the 2.sup.m D/A converters being applied to a coil which deflects the electron beam.