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:
Oct. 26, 1999
Filed:
Feb. 24, 1997
George Michael Berkin, Yardley, PA (US);
Quad Systems Corporation, Willow Grove, PA (US);
Abstract
The present invention relates to controls for a multi-zone reflow oven. In the present invention a plurality of infra red thermal scanners are located at critical points along the path which a substrate passes in a reflow oven so as to generate an actual solder paste time/temperature profile as a substrate passes through the zones of the reflow oven. The actual temperature of the solder paste is determined at critical zones for generating feedback control signals. The time/temperature profile is stored for transfer to a different reflow oven so as to effect the identical solder paste time/temperature curve on the same or a different oven. Temperature deviations from the points on the solder paste time/temperature curve are calculated and control signals are generated for producing feedback signals that are applied to the controllers of the belt drive motor, the convection fan motors as well as the heating elements in the heating blocks of the vertical zone heaters to control and effect an actual and desired optimum solder paste time/temperature profile.