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:
Feb. 05, 1991
Filed:
May. 16, 1989
Applicant:
Inventors:
Thomas L Guthrie, Huntington Beach, CA (US);
Paul K Stephenson, Anaheim, CA (US);
Assignee:
Excellon Industries, Inc., Torrance, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
364520 ; 364200 ;
Abstract
A method for generating mask transparencies for the mass production of printed circuit boards using a laser photoplotting system includes an algorithm for mapping geometric entities from the continuous plane such as is used in vector photoplotting to a pixel graphic representation of the geometric entities. The method reduces offset errors between rectangular entities and circular entities in phototool primitives constructed in the discrete pixel graphic system by selecting a pixel to represent the corner of the rectangular entity that is closest to the circumference of the circular entity.