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Method of conformal coating using noncontact dispensing

A non-contact, conformal coating technology, applied in the direction of coating non-metallic protective layer, coating, printed circuit coating, etc., can solve the problem that the auxiliary droplet is outside the target area and is difficult to control, so as to save materials and reduce Maintenance cost, pollution reduction effect

Inactive Publication Date: 2006-12-06
NORDSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is difficult to control and often results in a large number of satellite gobs outside the target area

Method used

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  • Method of conformal coating using noncontact dispensing
  • Method of conformal coating using noncontact dispensing
  • Method of conformal coating using noncontact dispensing

Examples

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Embodiment Construction

[0016] figure 1 It is a schematic diagram of a computer-controlled non-contact adhesive material injection system 10, such as the "AXIOM" X-1020 series available from Asymtek of Carlsbad, California, USA. The gob generator 12 is mounted on a Z-axis drive which is suspended from the X, Y positioning device 14 in a known manner. The X and Y positioning devices 14 are mounted on the frame 11 and define the first and second non-parallel axes of movement. The X, Y positioning device includes a cable driver combined with a pair of independent controllable stepping motors (not shown) in a known manner. A camera and a light-emitting diode (LED) light ring assembly 16 is connected to the gob generator 12 for movement along the X, Y, and Z axes to detect points and locate reference points. The type of camera and light ring assembly 16 may be as described in US Patent No. 5,052,338 entitled "APPARATUS FOR DISPENSING VISCOUS MATERIALS ACONSTANT HEIGHT ABOVE A WORKPIECE SURFACE", and the ent...

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Abstract

A method of noncontact dispensing is provided for conformal coating applications by jetting a viscous material (100) onto a substrate (36). Dispensing by a jetting process results in small wetted areas thus providing highly discrete and selective conformal coating capabilities. Enhanced selectivity permits the coating of small areas (100) and geometries and provides excellent edge definition between coated areas (100) and uncoated areas of the substrate (36).

Description

Technical field [0001] The present invention relates generally to the dispensing of viscous materials, and more particularly to a method of dispensing small amounts of viscous materials for applying conformal coatings to electronic components. Background technique [0002] Conformal coating is a process of applying insulating materials to electronic components, such as printed circuit (PC) boards or devices mounted on them, to protect them from moisture, mold, dust, corrosion, and abrasion And the influence of other external environmental factors. Common conformal coatings include (by way of example but not limited to) silicone, acrylic, polyurethane, epoxy synthetic resin, and various polymers. When used on a PC board, as the flux evaporates or the flux-free material solidifies, an insulating resin film with a substantially uniform thickness is formed. Several different processes for applying conformal coating are known, including dip coating, brushing, atomized air spray, and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K3/00H05K3/28H01L21/56H01L23/31
CPCH05K2203/013H05K3/0091H05K3/284H01L23/3121H01L21/56H01L2924/0002H01L2924/00B05D1/02H05K3/28H01L23/31
Inventor 方良伟霍雷肖·基尼奥内斯
Owner NORDSON CORP
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