Surface-mount inductor

• US 9,734,941 B2
• Filed: 10/29/2015
• Issued: 08/15/2017
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kitamura, Kazuhisa
• Primary Examiner(s): Lian, Mangtin
• Application Number:
  US14/926,020
• Publication Number:
  US 20160126005A1
• Time in Patent Office: 656 Days
• Field of Search: 336212, 336221, 336222, 336192, 336 83, 336233
• CPC Class Codes: H01F 17/043 with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
• CPC Class Codes: H01F 27/2852 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/061 Winding flat conductive wires or sheets
• CPC Class Codes: H01F 41/098 Mandrels; Formers

Abstract

A surface-mount inductor having a molded body which includes a coil formed by winding a rectangular wire and sealed by sealant having resin and filler, a surface of the molded body being a mounting face, the coil includes: first rolls wound in two-roll arrangement along the winding axis, the ends of the wire being placed at the outermost turn; and second rolls wound in positions adjacent to the first rolls and oppositely shifted along the winding axis, the inner diameter being equal to or larger than the outer diameter of the first rolls, the ends of the wire are brought out from the outermost turn of the second rolls as lead ends which are sealed in a manner that the winding axis is parallel with the mounting face and the lead ends are partially exposed at the mounting face, as well as a method for manufacturing the same.

Claims

1. A surface-mount inductor being provided with a molded body which includes a coil formed by winding a rectangular wire which is sealed using sealant containing resin and filler, at least a surface of the molded body being a mounting face, wherein

the coil comprises:

two first rolls wound in a two-roll arrangement along the winding axis, the ends of the wire being brought out to their outermost turn; and

two second rolls wound in positions adjacent to and each on opposite sides of the first rolls along the winding axis, the diameter of the innermost turn being equal to or larger than the diameter of the outermost turn of the first rolls, the outermost turns of the first rolls being at least partially not in contact with the innermost turns of the second rolls,

the ends of the wire are brought out from the outermost turn of the second rolls as lead ends which are coated in a manner that the winding axis is parallel with the mounting face and that the lead ends are at least partially exposed on the side of the mounting face.

2. A surface-mount inductor claimed in claim 1, wherein

the lead ends are brought out in the opposite directions from the outermost turn of the coil, and are bent to be U-shaped.

3. A surface-mount inductor claimed in claim 1, comprising

third rolls wound at different positions along the winding axis, and the diameter of the innermost turn being equal to or larger than that of the second rolls, wherein

the lead ends are brought out from the outermost turn of the third rolls.

4. A surface-mount inductor claimed in claim 1, comprising

a pair of metal bodies provided on the upper and bottom surfaces of the molded body with vacant areas, for covering the upper, bottom and side surfaces of the molded body and the lower ends of the metal bodies reaching the surface of the lead ends.