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US 6,143,157 AGranted
Plating permeable cores
AssigneeVLT, Inc.
InventorsLance L. Andrus, Cruz R. Calderon, Craig R. Davidson, Patrizio Vinciarelli
Life of this patent
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Abstract
A shield is applied to a permeable core in a predetermined pattern, where the predetermined pattern covers less than the entire surface area of the permeable core.
Claims75
A method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core from alteration by a subsequent plating process, and
- then plating a conductive shield to the core by depositing a seed layer in a predetermined pattern defined by a mask;
- and
- plating an outer layer on the seed layer.
1 more element
The method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core from alteration by a subsequent plating process,
- then plating a conductive shield to the core, and
- patterning the shield to achieve a controlled leakage inductance.
A method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core from alteration by a subsequent plating process, and
- then plating a conductive shield to the core,
- wherein the barrier coating is applied to only a portion of the surface area of the core.
The method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core from alteration by a subsequent plating process, and
- then plating a conductive shield to the core, wherein the plating includes
- removing a portion of the barrier coating to expose the surface of the permeable core.
A method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core from alteration by a subsequent plating process, and
- then plating a conductive shield to the core,
- the plating comprising pad-printing a seed layer.
A method comprising:
- coating a magnetically permeable core with Parylene to protect a magentic property of the core from alteration by a subsequent plating process;
- pad-printing a seed layer of iron, cobalt, and nickel-free silver ink on top of the Parylene coating;
- rack plating a copper layer on top of the seed layer using an acid bath, and
- ablating a portion of the shield with a laser to expose the surface of the permeable core.
1 more element
A method comprising:
- covering a magnetically permeable core with a barrier coating to protect a magnetic property of the core form alteration by a subsequent plating process, wherein the covering comprises coating the permeable core with photodefinable epoxy and curing the epoxy to the core before the plating;
- then plating a conductive shield to the core, wherein the plating leaves the shield in a predetermined pattern that covers less than the entire surface area of the permeable core and the shield is plated to the portions of the core not covered with epoxy.
A method comprising:
- barrel plating a conductive shield to a magnetically permeable core in a predetermined pattern, wherein the barrel plating comprises an alkaline bath to deter changing a magnetic property of the permeable core.
A method comprising:
- pad-printing a seed layer on a magnetically permeable core in a predetermined pattern.
A method comprising:
- coating a magnetically permeable core with photodefinable epoxy to protect a magnetic property of the core from alteration by a subsequent plating process;
- curing the epoxy to the core;
- and
- plating a conductive shield to the portions of the core not covered with epoxy.
1 more element
A method comprising:
- coating a magnetically permeable core with photodefinable epoxy;
- curing the epoxy to the core with an ultraviolet laser;
- washing off the uncured portions of epoxy in an alcohol bath;
- further curing the epoxy in an ultraviolet oven;
- and
- barrel plating a copper layer on the exposed portion of the core using an alkaline bath to deter changing a magnetic property of the permeable core.
3 more elements
A method comprising:
- coating a magnetically permeable core with Parylene to protect a magnetic property of the core from alteration by a subsequent plating process;
- pad-printing a seed layer of iron, cobalt, and nickel-free silver ink on top of the Parylene coating;
- and
- rack plating a copper layer on top of the seed layer using an acid bath.
1 more element
A method comprising:
- coating a magnetically permeable core with Parylene;
- ablating a predetermined pattern of the Parylene coating with a laser;
- and
- barrel plating a copper layer on top of the exposed portions of the permeable core using an alkaline bath to deter changing a magnetic property of the permeable core.
1 more element
Dependencies are inferred from the claim text.