Conformal coating using multiple applicators

Details Conformal coating using multiple applicators Conformal coating using multiple applicators

2000-09-05

2002-09-10

Beck, Shrive P. (Department: 1762)

Coating processes

Spraying

C118S313000, C118S315000, C118S679000, C901S043000

Reexamination Certificate

active

06447847

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical Field
The present invention generally relates to conformal coating of objects. More particularly, the present invention relates to a method and system for conformally coating objects, such as circuit boards.
2. Background Information
Conformal coating, such as, for example, acrylic, urethane or silicone, is used to, for example, protect the components on a circuit board from moisture, chemicals, dust, and shock. Conformal coating on circuit boards also acts as an insulator for electricity and heat. Because of this insulating property, some areas of a circuit board usually cannot be conformally coated, in order to preserve the electrical and/or heat conduction. Thus, conformal coating for circuit boards is performed selectively.
To accomplish selective conformal coating, requiring very precise applications, robotic dispensing systems have been employed. Such systems heretofore have provided relatively precise dispensing of conformal coating on small circuit board components, as well as the ability to spray conformal coating across larger areas of a circuit board.
However, existing robotic conformal coating systems employ a single valve. The use of a single valve is limiting in a number of ways. For example, a single type of head cannot generally provide multiple spray options tailored to the object or portion of the object that needs to be coated, e.g., wide spray versus thin stream. As another example, a single valve restricts the timing efficiency of the system.
Thus, a need exists for an improved way to apply conformal coating.
SUMMARY OF THE INVENTION
Briefly, the present invention satisfies the need for improved conformal coating by employing multiple coating applicators for multiple dispensing options and/or to improve coating efficiency.
In accordance with the above, it is an object of the present invention to provide improved conformal coating.
The present invention provides, in a first aspect, a conformal coating system. The system comprises at least one end effector, and a plurality of coating applicators coupled to the at least one end effector for applying conformal coating.
The present invention provides, in a second aspect, a method of conformally coating an object with a conformal coating system including at least one end effector capable of X, Y and Z axis movement and rotational movement about at least one axis, and a plurality of tiltable coating applicators coupled to the at least one end effector for conformal coating. The method comprises causing the at least one end effector to traverse a path along a perimeter of the object by movement along one or more axis and/or rotational movement; and dispensing conformal coating about the object through one or more of the tiltable coating applicators, the one or more applicators being tilted during the dispensing.
These, and other objects, features and advantages of this invention will become apparent from the following detailed description of the various aspects of the invention taken in conjunction with the accompanying drawings.


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