Browse Prior Art Database

Protective Coating for Devices on Encapsulated Modules

IP.com Disclosure Number: IPCOM000094030D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Farrell, JF: AUTHOR [+3]

Abstract

Active and passive devices 1 are protected on the surface of a dielectric substrate 2. This results from vacuum-forming a protective plastic film 3 over devices 1 and module 2 prior to molding protective plastic encapsulant 4 around the entire module. Film 3 is pulled down by the vacuum over the edges of substrate 2 to form a mechanical bond. Such holds film 3 in place until the final plastic encapsulating step is performed. Any thermoplastic film that can be vacuum molded and does not contain materials which adversely affect the devices is suitable for use as film 3. The presence of film 3 prevents lifting of devices 1 from the surface of substrate 2 during the plastic encapsulating step and further prevents the plastic material from working under the devices.

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Protective Coating for Devices on Encapsulated Modules

Active and passive devices 1 are protected on the surface of a dielectric substrate 2. This results from vacuum-forming a protective plastic film 3 over devices 1 and module 2 prior to molding protective plastic encapsulant 4 around the entire module. Film 3 is pulled down by the vacuum over the edges of substrate 2 to form a mechanical bond. Such holds film 3 in place until the final plastic encapsulating step is performed. Any thermoplastic film that can be vacuum molded and does not contain materials which adversely affect the devices is suitable for use as film 3. The presence of film 3 prevents lifting of devices 1 from the surface of substrate 2 during the plastic encapsulating step and further prevents the plastic material from working under the devices. Soft plastic material 5, such as a silicone gel, can be applied over the devices prior to the vacuum forming of film 3 to additionally protect the devices.

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