Invention Grant
- Patent Title: Wire bond encapsulant application control
- Patent Title (中): 电线键合密封剂应用控制
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Application No.: US11860541Application Date: 2007-09-25
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Publication No.: US07659141B2Publication Date: 2010-02-09
- Inventor: Laval Chung-Long-Shan , Kiangkai Tankongchumruskul , Kia Silverbrook
- Applicant: Laval Chung-Long-Shan , Kiangkai Tankongchumruskul , Kia Silverbrook
- Applicant Address: AU Balmain, New South Wales
- Assignee: Silverbrook Research Pty Ltd
- Current Assignee: Silverbrook Research Pty Ltd
- Current Assignee Address: AU Balmain, New South Wales
- Main IPC: H01L21/00
- IPC: H01L21/00

Abstract:
A method of applying encapsulant to a die mounted to a support structure by providing a die mounted to the support structure, the die having a back surface in contact with the support structure and an active surface opposing the back surface, the active surface having electrical contact pads, positioning a barrier proximate the electrical contact pads and spaced from the active surface to define a gap and, depositing a bead of encapsulant onto the electrical contact pads such that one side of the bead contacts the barrier and a portion of the bead extends into the gap and onto the active surface. Placing a barrier over the active surface so that it defines a narrow gap allows the geometry of the encapsulant front (the line of contact between the encapsulant and the active surface) can be more closely controlled. Any variation in the flowrate of encapsulant from the needle tends to cause bulges or valleys in the height of the bead and or the PCB side of the bead. The fluidic resistance generated by the gap between the barrier and the active surface means that the amount of encapsulant that flows into the gap and onto the active surface is almost constant. The reduced flow variations make the encapsulant front closely correspond to the shape of the barrier. Greater control of the encapsulant front allows the functional elements of the active surface of the die to be closer to the contact pads.
Public/Granted literature
- US20090081833A1 WIRE BOND ENCAPSULANT APPLICATION CONTROL Public/Granted day:2009-03-26
Information query
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