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. 18, 1994
Filed:
Feb. 22, 1993
Applicant:
Inventors:
James M Weaver, Ambler, PA (US);
Michael J Sowers, Lansdale, PA (US);
Assignee:
Kulicke and Soffa Investments, Inc., , DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ; H01L / ;
U.S. Cl.
CPC ...
364148 ; 318116 ; 310316 ; 364477 ; 364481 ; 2281101 ; 228-11 ;
Abstract
Apparatus and a method for controlling the power output of an ultrasonic generator to a transducer includes a variable impedance network circuit which is interposed between the generator and the transducer. Sensing circuits and a microprocessor are coupled to the input of the transducer so that the total impedance Z.sub.T, the transducer impedance in free air Z.sub.FA and the load impedance Z.sub.L may be calculated and the network impedance Z.sub.NW may be set for a bonding operation to maintain the power level P.sub.L or the impedance Z.sub.L at a desired predetermined level.
Published as:
US5357423A; JPH0768220A;