Manufacturing method of surface-mount inductor
AssigneeMurata Manufacturing Co., Ltd.
InventorKeita Muneuchi
Life of this patent
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Abstract
A surface-mount inductor comprises a molded body containing a metal magnetic powder; at least one coil buried in the molded body such that lead-out end parts at both ends of the coil are at least partially exposed on a surface of the molded body; and an external terminal formed over an exposed surface of each of the lead-out end parts. A metal magnetic powder exposed portion is formed at least around the exposed surface. The external terminal at least includes a first plating layer formed over the metal magnetic powder exposed portion and the exposed surface of the lead-out end part, and a conductive paste layer formed on the first plating layer and made of a solidified conductive paste. Consequently, the surface mount inductor comprises an external terminal having high connection reliability.
Claims12
A manufacturing method of a surface-mount inductor having at least one coil buried in a molded body containing a metal magnetic powder, the method comprising:
- molding by placing the at least one coil in a molding die and filling a material for a molded body into the molding die to obtain the molded body, wherein the coil is buried in the molded body such that lead-out end parts at both ends of the coil are at least partially exposed on a surface of the molded body;
- forming an external terminal over an exposed surface of each of the lead-out end parts and a metal magnetic powder exposed portion formed at least around the exposed surface, the forming the external terminal at least including forming a first plating layer over the metal magnetic powder exposed portion and the exposed surface of the lead-out end part;
- and
- forming a conductive layer on the first plating layer by applying a conductive paste on the first plating layer and performing a heat treatment to dry and solidify the conductive paste,
- wherein the forming the external terminal includes forming a second plating layer on the conductive layer, and wherein one or more conductive layer non-formation regions are formed in the conductive layer to directly bond the first plating layer and the second plating layer in the one or more conductive layer non-formation regions.
A manufacturing method of a surface-mount inductor having at least one coil buried in a molded body containing a metal magnetic powder, the method comprising:
- molding by placing the at least one coil in a molding die and filling a material for a molded body into the molding die to obtain the molded body, wherein the coil is buried in the molded body such that lead-out end parts at both ends of the coil are at least partially exposed on a surface of the molded body;
- forming an external terminal over an exposed surface of each of the lead-out end parts and a metal magnetic powder exposed portion formed at least around the exposed surface, the forming the external terminal at least including forming a first plating layer over the metal magnetic powder exposed portion and the exposed surface of the lead-out end part;
- and
- forming a conductive paste layer made of a solidified conductive paste on the first plating layer,
- wherein the forming the external terminal includes forming a second plating layer on the conductive paste layer, and wherein one or more conductive-paste-layer non-formation regions are formed in the conductive paste layer to directly bond the first plating layer and the second plating layer in the one or more conductive-paste-layer non-formation regions.
Dependencies are inferred from the claim text.