JPH0514494Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an inductor for a circuit board in which a winding is wound around a magnetic material, suitable for mounting on a printed circuit board, for example.

(Prior Art) The present applicant previously proposed an inductor as shown in Figure 3, which is suitable for mounting on a printed circuit board.

The inductor has a winding b around a toroidal magnetic core a.
It consists of an inductor body c wound with an inductor body c, and an insulator d that holds the inductor body c, and the insulator d is formed into a rectangular parallelepiped with a housing part e opening on the top surface, and the longitudinal side of the housing part e is Terminal pins f, f are embedded in the thick side walls in the direction, one end of which slightly protrudes on the top surface to form a connection part h that connects the terminal g of the winding b, and the other end is perpendicular to the bottom surface. This is a lead portion i which is led out in parallel and connected to the wiring of the circuit board. In addition, the two side walls of the insulator d that face each other in the direction perpendicular to the longitudinal direction are both thin.
A tongue-shaped protrusion j that is the same as or protrudes outward from the connecting portion h is integrally formed on its upper edge.

The width, length, and depth of the accommodating part e correspond to the thickness and diameter of the inductor body c, and after accommodating the inductor body c in the accommodating part e, the ends g of the windings b are connected to each other. It is attached to the connecting portion h of the terminal pin f, and is soldered by dipping the connecting portion h into molten solder.

To mount such an inductor on a circuit board, etc., the inductor is supplied to an automatic mounting device, moved onto the circuit board by the holder, and the lead portion i of the terminal pin f is inserted into the through hole of the circuit board. The upper surface of the tongue-shaped protrusion j is pressed by the pusher of the automatic mounting device, and the lead portion i is inserted up to the base thereof, and is fixed on the back surface of the circuit board by flow soldering.

(Problem to be Solved by the Invention) In the above-mentioned inductor, when the inductor body c is stored in the housing part of the insulator d, the winding b is not stored until the inductor body c reaches the bottom of the housing part e.
Terminal g may be connected to connection h. In such a case, if the connection part h is immersed in molten solder and soldered, the inductor body c will be exposed to the molten solder liquid level.
There was a problem in that the solder was immersed in the wire, solidified while remaining stuck between the windings, and a solder bridge was formed between the connecting portions h and h, causing the solder to shoot out. In addition, when the inductor main body c is correctly stored in the housing part e and the inductor is mounted on the circuit board, the inductor is tilted and held in the holder of the automatic mounting device, and is supplied to the circuit board in the tilted state, and the inductor is automatically mounted. When the pusher of the device applies a pressing force to one of the tongue protrusions j and pushes it in, the protrusion j breaks because the pressing force is applied diagonally to the protrusion j, and as a result, the pusher breaks the edge of the insulator d. There was a problem in that the connection part h of the terminal pin f and the inductor body c could be damaged by pressing.

The present invention aims to solve these conventional problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention consists of an inductor body in which a winding is wound around a ring-shaped magnetic body, and a substantially rectangular parallelepiped insulator that holds the inductor body. , a terminal pin fixed to the insulator, one end protruding from the top surface of the insulator, conductively connected to the terminal of the winding outside the insulator, and the other end leading out from the bottom surface of the insulator as a lead; In an inductor for a circuit board having an inductor pressing protrusion that protrudes beyond the length of a connection portion to which an end of a winding of a terminal pin is connected, the protrusion is formed on the upper surface of the insulator, and the protrusion is formed on the side surface of the insulator. The present invention is characterized in that a recessed portion is formed in which the inductor main body is moved and accommodated in its thickness direction.

(Function) Since the inductor main body having an annular magnetic body is moved and stored in the recess formed on the side surface of the insulator in the thickness direction thereof, it is easy to insert the inductor main body to the bottom of the recess. In addition, since the inductor body is not exposed on the top surface of the insulator where one end of the terminal pin protrudes as a connection part, when flow soldering the connection part of the terminal pin that wraps around the end of the winding, the inductor body is exposed to the molten solder. Therefore, there is no risk of electrical shorting between the terminal pin connections. In addition, the pressing protrusion protects the connection between the end of the winding and the terminal pin, or the inductor is held in an inclined state by an automatic mounting device and is supplied diagonally onto the circuit board. Even if the pusher presses the pressing protrusion diagonally, the protrusion will not bend and be damaged, and therefore the terminal pin connection portion and the inductor body will not be damaged.

(Example) Examples of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. In the drawings, 1 is an inductor body in which a winding 3 is applied to a toroidal core 2 made of ferrite, and 4 is a substantially rectangular parallelepiped insulator made of a synthetic resin such as polyethylene terephthalate that holds the inductor body 1. 4 has terminal pins 8, 8 on both sides thereof, one end of which protrudes from the upper surface of the insulator 4 as a connecting portion 6 for connecting the terminal 5 of the winding 3, and the other end of which is led out from the lower surface as a lead portion 7. buried,
A recess 9 for accommodating the inductor body 1 is formed on its front side.

The recess 9 is slightly larger than the inductor body 1,
Its depth is approximately equal to the thickness of the inductor body 1. Further, grooves 10, 10 are formed in the insulator 4 to connect the terminal 5 of the winding 3 to the connection part 6 of the terminal pin 8, and the grooves 10, 10 communicate with the recess 9 to the upper surface. An inductor pressing protrusion 11 is formed which protrudes beyond the length of the connecting portion 6 of the terminal pin 8 and has a relatively large area.

Incidentally, in the embodiment described above, the recess 9 is formed in a circular shape, but it may be formed in a polygonal shape.

(Effects of the invention) As explained above, according to the invention, it is easy to insert the inductor main body into the recess of the insulator and hold it in the insulator, and it is possible to easily insert the inductor main body into the recess of the insulator and hold it in the insulator. Even if the inductor body is not securely housed in the recess when the inductor is fixed by flow soldering, there is no chance of shortening between the terminal pin connections due to solder adhering between the windings. Moreover, the recess has the effect of easily storing and holding the inductor body around which the winding is wound, and protecting the inductor body during flow soldering. Furthermore, when pressing the inductor with the pusher of the automatic mounting device and inserting the lead part of the terminal pin into the through hole of the printed circuit board up to the base,
The pressing protrusion protects the terminal of the winding and the connection part of the terminal pin, and the pressing protrusion does not break even if pressed diagonally, so there is no possibility of damaging the terminal pin connection part or the inductor body. The effect is that there is no

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view of an inductor previously proposed by the applicant. DESCRIPTION OF SYMBOLS 1... Inductor main body, 3... Winding wire, 4... Insulator, 5... Terminal, 6... Connection part, 8... Terminal pin, 9... Recessed part, 11... Inductor pressing protrusion.

Claims (1)

[Scope of utility model registration request] The inductor body consists of an inductor body in which a winding is wound around a ring-shaped magnetic body, and a substantially rectangular parallelepiped insulator that holds the inductor body. a terminal pin that is electrically conductively connected to the end of the winding and whose other end is a lead portion led out from the lower surface of the insulator; and an inductor press that protrudes beyond the length of the connecting part to which the end of the winding of the terminal pin is connected. In the inductor for a circuit board, the protrusion is formed on the upper surface of the insulator, and a recess is formed in the side surface of the insulator to accommodate the inductor body by moving it in the thickness direction. Inductor for circuit boards.