Surface mount inductor and manufacturing method thereof
A technology of surface mounting and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, inductors, fixed inductors, etc., can solve the problem of area wire superimposed current value resistance value Rdc deterioration, unable to increase the shape of the coil, and the shape of thin parts Complicated and other issues, to improve the superimposed current value, easy to manufacture, and simplify the structure
Active Publication Date: 2018-10-26
MURATA MFG CO LTD
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Problems solved by technology
[0005] However, in such conventional surface mount inductors, coils are formed by resin molding or compact powder molding in a state where the lead-out end of the coil is sandwiched between the columnar convex portion of the sheet member and the inner wall surface of the molding die. Built-in molded body, therefore, the shape of sheet parts becomes complicated, and the shape of the coil cannot be enlarged, so the area of the winding shaft part of the coil and the cross-sectional area of the lead are reduced, resulting in deterioration of the superimposed current value Idc and resistance value Rdc
Method used
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[0021] One or more embodiments of the present invention include: a coil formed by winding a conductive wire; and a molded body formed using a sealing material containing a resin and a magnetic material and incorporating the coil. The coil has: a winding portion that winds a conducting wire so that both ends of the conducting wire are located on the outer periphery; and a lead-out end portion that is drawn out from the outer periphery of the winding portion. The molded body is formed in such a way that part of the surface of the coil is exposed on four side surfaces of the molded body parallel to the winding axis of the coil, and the area of the part outside the outer circumference of the coil winding part is the same as the inner circumference of the coil winding part. The area of the inner portion is substantially the same or smaller than that. Therefore, in one or more embodiments of the present invention, the size of the outer shape of the coil can be increased to the l...
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A molded body with a built-in coil is formed by resin molding or powder molding in a state where the lead-out end of the coil is sandwiched between the columnar convex portion of the sheet member and the inner wall surface of the molding die. Therefore, the sheet member The shape becomes complicated, and the shape of the coil cannot be enlarged, so the area of the winding shaft portion of the coil and the cross-sectional area of the lead wire are reduced, and the superimposed current value and the resistance value are deteriorated. The present invention includes: a coil formed by winding a conductive wire; and a molded body using a sealing material containing a resin and a magnetic material and incorporating the coil. The coil is formed by winding a conductive wire so that the lead-out end portion is located on the outer periphery of the winding portion. The molded body is formed in such a way that part of the surface of the coil is exposed on four side surfaces of the molded body parallel to the winding axis of the coil, and the area of the part outside the outer circumference of the coil winding part is the same as the inner circumference of the coil winding part. The area of the inner portion is substantially the same or smaller than that.
Description
technical field [0001] The present invention relates to a surface mount inductor comprising: a coil formed by winding a wire; and a molded body formed using a sealing material containing a resin and a magnetic material, and a method for manufacturing the same. The coil is built in. Background technique [0002] Such as Figure 8 As shown, among conventional surface mount inductors, there is a surface mount inductor in which a coil 21 is formed by winding a lead wire, and the coil 21 is embedded in a molded body 27 formed of a sealing material containing magnetic powder and resin. The coil 21 is connected to the external terminal 28 formed on the surface of the molded body 27 (for example, refer to JP-A-2010-245473). For this surface mount inductor, as Figure 9 As shown, a coil 21 formed by winding a conductive wire is mounted on a tablet 22, as shown in Figure 10 As shown, the coil and the sheet member are arranged so that the lead-out end portion 21b of the coil 21 is ...
Claims
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IPC IPC(8): H01F17/04H01F27/28H01F27/29H01F27/32H01F41/02H01F41/04H01F41/12
CPCH01F17/04H01F2017/048H01F41/076H01F27/2828H01F27/292H01F41/0246H01F27/08H01F27/28H01F27/29H01F27/32H01F41/02H01F41/04Y10T29/4902
Inventor 正田佳利佐藤晃三村上诚佐佐森邦夫高桥直人
Owner MURATA MFG CO LTD