Dam for lead encapsulation

Details Dam for lead encapsulation Dam for lead encapsulation

1988-04-15

1989-11-21

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Female mold type means

264263, 26427211, 26427217, 425125, 437207, 437209, H01L 2156

Patent

active

048818852

ABSTRACT:
An apparatus to encapsulate a device and joints coupled to conductive leads with an encapsulating material. A fixture has a recess to hold via a vacuum the device in place. Conduits in the fixture supply air around the device to form an air dam that flows outward around the device and the leads. A nozzle supplies a metered amount of material to the surface of the device. By controlling the temperature of the fixture and/or the air forming the air dam, the flow of material can be confined to the surface of the device and the joints as it cures. The method can also provide encapsulant edge capping to reduce device stresses.

REFERENCES:
patent: 3523360 (1970-08-01), Moose
patent: 4567006 (1986-01-01), Covington et al.
patent: 4641418 (1987-02-01), Meddles
patent: 4741507 (1988-05-01), Baird

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