COOLING FAN AND ELECTRONIC DEVICE HAVING THE SAME
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United States of America Patent
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Mar 27, 2017
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Nov 14, 2016
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Abstract
A cooling fan includes a base plate and a central tube connected to a center of the base plate. The central tube is made of metal by injection molding, and is a hollow cylinder with both ends open. An outer circumferential surface of one end adjacent to the base plate is connected to the base plate by laser welding, thereby forming a melted layer at a connecting portion between the outer circumferential surface of the end and the base plate.
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