Electronic component and method for fixing the same

• US 7,973,634 B2
• Filed: 05/05/2006
• Issued: 07/05/2011
• Est. Priority Date: 05/13/2005
• Status: Active Grant

• Current Assignee: Wurth elektronik eisos gmbh & co. kg
• Original Assignee: Wurth elektronik eisos gmbh & co. kg
• Inventors: Aumueller, Rupert
• Primary Examiner(s): Mai; Anh T
• Assistant Examiner(s): Lian; Mangtin
• Application Number:
  US11/920,340
• Publication Number:
  US 20090058590A1
• Time in Patent Office: 1,887 Days
• Field of Search: None
• US Class Current: 336/205
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core
• CPC Class Codes: H05K 2203/0195 Tool for a process not provided for in H05K3/00, e.g. tool for handling objects using suction, for deforming objects, for applying local pressure
• CPC Class Codes: H05K 2203/082 Suction, e.g. for holding solder balls or components
• CPC Class Codes: H05K 3/303 Surface mounted components, e.g. affixing before soldering, aligning means, spacing means H05K3/32 takes precedence
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.
• CPC Class Codes: Y10T 29/4922 with molding of insulation

Abstract

Disclosed is an electronic component, especially a coil with a coil core, in which the turns of the coil winding are spaced apart from each other at least at one point in the longitudinal direction of the coil. A plastic retaining element which overlaps both the coil core and at least the two adjacent turns of the coil winding in a longitudinal direction is sprayed on in the area of said point, whereby a connection between the coil core and the coil winding is created at the same time. The retaining element can be sprayed around a closed circumference of the coil while covering only a portion of the coil in the longitudinal direction thereof. Preferably, the retaining element is placed approximately in the center relative to the longitudinal extension of the coil.

Claims

1. An electronic component which is formed for automatic mounting and comprises a holding element (8, 18, 28) which is made of plastic and which is injection molded on the electronic component and which is formed as a holding point for a grasper;

wherein the electronic component is formed as a coil with a coil core (1) and with a coil winding (3) that surrounds the coil core (1) and includes a plurality of individual coils (4) extending between at least two connection ends (5, 6);

wherein the coil core 1) is provided without end flanges for preventing the coil core (1) from sliding within the coil winding (3);

wherein a gap (7) is provided between two spaced apart adjacent coils among the plurality of individual coils (4) of the coil winding (3) in the longitudinal direction of the coil winding (3), and wherein the holding element (8, 18) is attached as an injection molded body that contacts the coil core (1) and bridges the gap (7) between the two spaced apart adjacent coils (4), and

wherein the holding element (8, 18, 28) grips both the coil core (1) and the two spaced apart adjacent coils (4) in the gap and intermediate opposite ends of the coil winding (3) to prevent longitudinal movement of the core relative to the coil winding; and

wherein the gap between the two spaced apart adjacent coils is provided at only one location along the length of the coil core, with the other coils being adjacent to one another and providing no additional gap.

2. A component according to claim 1, wherein the holding element (8, 18) is located on a side of the coil turned away from the assembly side of the coil.

3. A component according to claim 1, wherein the holding element (8, 18) extends over at least one part of the circumference of the component.

4. A component according to claim 1, wherein the holding element (8, 18) extends over at least one part of the circumference of the component.

5. A component according to claim 1, wherein the holding element (18) extends over the entire circumference of the component.

6. A component according to claim 1, wherein the holding element (8, 18) features a plane surface (9) on the side of the component turned away from the assembly side.

7. A component according to claim 1, wherein the holding element (8, 18) is injection molded from plastic that develops an adhesive effect at soldering temperatures.

8. A component according to claim 1, wherein the plurality of individual coils has an increased pitch in the area of the gap in relation to a pitch of the adjacent coils on opposite sides of the gap.

9. A component according to claim 8, wherein the holder extends over only a portion of the coil winding to allow heat dissipation from the coils.

10. A component according to claim 1, wherein the holder extends over only a portion of the coil winding to allow heat dissipation from the coils.

11. A method for making an electronic component, the method comprising:

molding a holding element on the electronic component by injection molding, wherein on the holding element a contact surface for a grasper is formed; and

moving the electronic component to an assembly point by using a grasper acting on the contact surface of the holding element; and

wherein the electronic component has a coil winding and a coil core and wherein a gap is provided between two pluralities of individual coils in the coil winding,

wherein the coil core is provided without end flanges for preventing the coil core from sliding out of the coil winding; and

wherein the coil winding is positioned during the injection molding such that when plastic is injected, the holding element is formed across the gap and is formed in contact with the coil core in the gap and in contact with the two pluralities of individual coils on opposite sides of the gap to prevent the coil core from sliding out of the coil winding.

12. A method according to claim 11, wherein the holding element (8, 18) is injection molded on the side of the component turned away from the assembly side of the component.

13. A method according to claim 11, wherein the holding element (8, 18) is injection molded over at least one part of the circumference of the component.

14. A method according to claim 11, wherein the holding element (8, 18) is injection molded over only one part of the length of the component.

15. A method according to claim 11, wherein the holding element (18) is injection molded around the entire circumference of the component.

16. A method according to claim 11, wherein the holding element (8, 18) is provided with a plane surface (9) on the side turned away from the assembly side of the component.

17. A method according to claim 11, wherein the holding element is injection molded from plastic that develops an adhesive effect at a temperature corresponding to the soldering temperature.

18. A method according to claim 11, wherein the plurality of individual coils is provided with an increased pitch in the area of the gap in relation to a pitch of the adjacent coils on opposite sides of the gap.

19. A method according to claim 18, wherein the holder is molded to extend over only a portion of the coil winding to allow heat dissipation from the coils.

20. A method according to claim 11, wherein the gap between the coils is provided at only one location along the length of the coil core, the other coils being adjacent to one another and providing no additional gap.

21. A method according to claim 20, wherein the holder is molded to extend over only a portion of the coil winding to allow heat dissipation from the coils.