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. 19, 2003
Filed:
Apr. 30, 2001
Applicant:
Inventors:
Chi Wah Cheng, Kwai Chung, HK;
Ping Kong Joseph Choy, Kwai Chung, HK;
Ping Chun Benson Chong, Kwai Chung, HK;
Ka Kin Wong, Kwai Chung, HK;
Chi Fung Chan, Kwai Chung, HK;
Assignee:
ASM Assembly Automation Limited, Kwai Chung, HK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K 1/06 ;
U.S. Cl.
CPC ...
B23K 1/06 ;
Abstract
There is disclosed a method and apparatus for ensuring release of objects such as solder balls from a pick head in a transfer and placement apparatus, comprising causing said pick head to vibrate by applying a vibration signal to said pick head over a range of frequencies. The range of frequencies is chosen such that it bounds the resonant frequencies of the pick head which may be calculated by computer simulation.