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. 11, 2003
Filed:
Oct. 23, 2001
Akira Takeishi, Tokyo, JP;
Noriyuki Kubota, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
To remove the turbulence affecting the positioning control of a bonding head along the Z axis when a stage is moved in the XY direction, and to exercise accurate wire loop control, a feed forward compensator is provided for a control unit. The feed forward compensator calculates a reaction force, which is applied to a bonding head due to the acceleration generated during horizontal movement along the XY axes, based on the distance between the center of a rotary shaft and the center of gravity of the bonding arm, the mass of the bonding arm, and the acceleration generated when the XY stage is moved along the XY axes. The obtained reaction force is transmitted as a feed forward value to a controller, in order to offset the reaction force.