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:
Aug. 10, 1993
Filed:
Feb. 16, 1988
Ryuji Horiguchi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A circuit for detecting an end point of an arc in XY coordinate system comprises a first register storing an X coordinate value of a given end point, a second register storing an Y coordinate value Yse of the same given end point, a third register storing a Y coordinate value Y of a coordinate point of a calculated arc pattern, a fourth register storing a Y coordinate Y of the same coordinate point of the same calculated arc pattern. A first comparator is coupled to the first register and the third register to generate a first coincidence signal when a content of the first register is coincident with a content of the third register and when a tangential angle of the calculated coordinate point is within a first angular extent. A second comparator is coupled to the second register and the fourth register to generate a second coincidence signal when a content of the second register is coincident with a content of the fourth register and when the tangential angle of the calculated coordinate point is within a second angular extent.