Method of noncontact dispensing of viscous material
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A viscous material, non-contact technology, used in devices for applying liquid to surfaces, coatings, printed circuit manufacturing, etc., can solve problems such as excessive thermal pressure, erosion, etc., to reduce production costs and product costs, reduce size , the effect of reducing the number of allocation cycles
Inactive Publication Date: 2005-05-04
NORDSON CORP
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Second, adjacent devices must be placed on the PC board outside of the wetted area
Too little epoxy leads to erosion and too much heat stress
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[0021] figure 1 is a schematic diagram of a computer controlled non-contact viscous material injection system 10, for example, the commercially available "AXIOM" X-20 series from Asymtek of Carlsbad, California. A droplet generator 12 is mounted on a Z-axis drive suspended from an X,Y positioner 14 in a known manner. The X,Y positioner 14 is mounted on the frame 11 and defines first and second non-parallel axes of motion. The X, Y positioner comprises a cable drive connected in known manner to a pair of independently controllable stepper motors (not shown). A video camera and LED aperture assembly 16 is connected to the droplet generator 12 for movement along the X, Y and Z axes to check points and locate reference fiducials. The video camera and aperture assembly 16 may be of the type described in U.S. Pat. No. 5,052,338 "APPARATUS FOR DISPENSING VISCOUS MATERIALS ACONSTANT HEIGHT ABOVE A WORKPIECE SURFACE," the entire disclosure of which is incorporated herein by referenc...
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Abstract
A method of noncontact dispensing a viscous material onto a surface of a substrate, which uses a jetting valve having a nozzle directing the viscous material flow in a jetting direction nonperpendicular to the surface of the substrate. The nonperpendicular jetting direction results in the droplet producing a reduced wetted area on the substrate.
Description
technical field [0001] The present invention relates generally to dispensing of viscous materials, and more particularly, to methods of non-contact dispensing of droplets of viscous materials. Background technique [0002] In the manufacture of substrates, such as printed circuit boards ("PC"), it is often desirable to apply very small amounts of viscous materials, ie, those with viscosities greater than 50 centipoise. Such materials include, by way of example but not limitation, general purpose adhesives, solder pastes, fluxes, solder masks, greases, oils, sealants, potting compounds, epoxies, die attach pastes, silicones , RTV and cyanoacrylate adhesives. [0003] In the quest for ever-increasing miniaturization of circuits, a fabrication process known as flip-chip has developed that has multiple processes that require dispensing of viscous fluids. For example, if Figure 8 As shown, a device 39, eg, a semiconductor wafer or chip, is attached to a substrate, such as a PC...
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