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, 1997
Filed:
Apr. 24, 1995
Stuart Erickson, Marblehead, MA (US);
Drew Erickson, Newburyport, MA (US);
Ultrasonic Systems, Inc., Amesbury, MA (US);
Abstract
A printed circuit board ('PCB') is moved on a conveyor towards an ultrasonic spray head ('head') that is mounted below the PCB on a guide rail. The guide rail and the direction of motion of the PCB define an acute angle. When the PCB reaches a predetermined position, the head begins a motion across the PCB, spraying a rectangular swatch of soldering flux. The velocity of the head is controlled such that the swatch of flux is substantially perpendicular to the direction of motion of the PCB. After spraying, the head deactivates and reciprocates back across the PCB such that no flux is sprayed. The cycle repeats after a predetermined delay whereby adjacent swatches of flux do not substantially overlap.