JPH06251943A - Electromagnetic apparatus - Google Patents

Abstract

PURPOSE:To electrically and mechanically connect and fix a connection pin to a substrate completely by a method wherein the title electromagnetic apparatus is provided with a coil bobbin where a coil is wound, a mounting pin, a mounting hole, and a connection pin, which is inserted in the mounting hole almost in parallel with the mounting pin in a freely advancing or retreating manner, are provided. CONSTITUTION:A mounting pin 18 is protrudingly provided in the vicinity of the four corners of one of flange parts 17 formed on both sides of the cylindrical winding barrel part 16, on which a coil 15 is wound, along the axial direction of a coil bobbin 13. A mounting through hole 21 is provided along the axial direction of the coil bobbin 13 in the vicinity of the tip of a terminal base 20 which is protrudingly provided along the axial direction and the vertical direction of the coil bobbin 13. A connection pin 22 is inserted into the mounting hole 21 almost in parallel with an inserting part 24 in a freely advancing or retreating manner, and the lead-out wire 26 of the coil 15 is tied up to the base part. The mounting pin 18 of the electromagnetic apparatus main body 11 and the connection pin 22 are inserted into the inserting hole 29 of a circuit substrate 27 and soldered (31) to a circuit pattern. As a result, the force generated by the vibration and the like of the electromagnetic apparatus main body is not imposed on the connection pin, and poor electric connection can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device electrically and mechanically connected to a substrate.

[0002]

2. Description of the Related Art Conventionally, as this type of electromagnetic equipment, for example, the structures shown in FIGS. 4 and 5 have been adopted.

The electromagnetic device main body 40 such as a transformer or a choke coil shown in FIGS. 4 and 5 is formed of a plastic cylindrical tubular bobbin 41 having flange-shaped terminal blocks 42 at both axial ends thereof. One end of a cylindrical connecting pin 43 made of metal is embedded in the base 42, and a plurality of connecting pins 43 are attached so as to project substantially parallel to the same direction. Furthermore, the lead wires 46 at both ends of the coil 45 wound around the coil bobbin 41 are entwined and electrically connected to the base portion on the one end side where the connection pin 43 is embedded.

The electromagnetic device body 40 is attached from the surface of the circuit board 47, on which a circuit pattern (not shown) is printed, on which the circuit pattern is not formed, and the connection pins 43 are soldered to the circuit pattern on the front surface of the circuit board 47. 48 and circuit board
It is electrically and mechanically connected and fixed to 47.

[0005]

However, in the electromagnetic device main body 40 having the structure shown in FIGS. 4 and 5 described above,
As shown in FIG. 5, the bending of the connecting pin 43 and the coil bobbin 41
The main body 40 of the electromagnetic device is inclined and attached to the circuit board 47 due to the warp of the main body 40 or the lower end of the main body 40 of the electromagnetic device and the circuit board 47.
When the electromagnetic device body 40 is mounted so that it floats with a gap between it and the back surface of the 47, the weight of the electromagnetic device body 40 is applied to the connection pin 43 soldered to the circuit pattern 48 and vibration is transmitted. , Circuit pattern peeling and soldering
For example, the occurrence of cracks in the 48 parts caused the connection pin 43 and the circuit board.
There is a problem that causes a poor connection with 47.

Further, it is necessary to confirm the connection state of the electromagnetic equipment body 40 to the circuit board 47 and to manually correct the soldering 48 portion when the electromagnetic equipment body 40 is tilted and connected. Therefore, there is a problem that the manufacturability is reduced and the cost is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic device that can be electrically and mechanically securely connected and fixed to a substrate.

[0008]

An electromagnetic device according to the present invention includes a coil bobbin around which a coil is wound, a mounting pin projecting from the coil bobbin and fixed by soldering to a substrate, and the mounting pin protruding from the coil bobbin. A mounting hole formed along the direction; and a connection pin that is inserted into the mounting hole so as to be capable of advancing and retracting substantially parallel to the mounting pin and electrically connected to the end of the coil and fixed to the substrate by soldering. It was done.

[0009]

In the electromagnetic device of the present invention, the coil bobbin on which the coil is wound and the projecting mounting pin is provided with a mounting hole along the protruding direction of the mounting pin, and the mounting hole is advanced and retracted substantially parallel to the mounting pin. Insert one end of the connection pin that freely electrically connects the end of the coil to the base and solder the mounting pin and the connecting pin to the board, so the mounting pin is used to fix to the board, and the connecting pin Does not apply the force generated by the vibration of the main body of the electromagnetic equipment and prevents electrical connection failure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electromagnetic device of the present invention will be described below with reference to the drawings.

In FIG. 1 to FIG. 3, 11 is a main body of an electromagnetic device such as a transformer or a choke coil, and the main body 11 of the electromagnetic device is integrally molded between E-shaped laminated iron cores 12 which are weld-connected to each other. The coil bobbin 13 made of plastic is sandwiched and mounted.

The coil bobbin 13 has a tubular shape in which a central leg (not shown) of the laminated iron core is inserted into the central axis, and a winding drum portion 16 around which the coil 15 is wound is formed on the outer peripheral surface. Substantially square flanges 17, 17 are formed on both sides of the 16 so as to face each other. Further, one flange portion 17 has
Around the four corners, along the axial direction of the coil bobbin 13, a metal-made cylindrical mounting pin 18 is embedded and projected at one end. Further, a terminal block 20 is formed so as to project in a direction perpendicular to the axial direction of the coil bobbin 13, and a terminal block 20 is provided near the tip end thereof along the axial direction of the winding drum section 16 as shown in FIG. A mounting hole 21 is formed in a hole shape.

Further, 22 is a connecting pin, and this connecting pin 22
Is formed in a cylindrical shape made of metal, and a bulging portion 23 having a diameter larger than that of the mounting hole 21 is formed from one end side in the longitudinal direction.
The tip side of 23 is smaller than the mounting hole 21 of the terminal block 20
Are formed. And this connecting pin 22 is
24 is inserted into the mounting hole 21 so that it can move back and forth, and the lead wires 26 at both ends of the coil 15 wound around the coil bobbin 13 are entwined and electrically connected to the base of the bulging portion 23 on the center side. It is attached to the table 20.

Next, the operation of attaching the electromagnetic equipment body 11 to the circuit board 27, which is a board, will be described with reference to FIG.

The circuit board 27 includes a board body 28 made of synthetic resin or the like, a lead wire of an electric component (not shown), and a mounting pin 18.
Further, it has an insertion hole 29 through which the connection pin 22 and the like are inserted, and a conductive circuit pattern (not shown) is printed on the front surface.

Then, from the rear surface of the circuit board 27 on which the circuit pattern is not printed, the mounting pins of the electromagnetic device body 11 are attached.
The tip ends of the 18 and the connection pin 22 are inserted into a predetermined insertion hole 29, and the mounting pin 18 and the connection pin 22 protruding on the front surface of the circuit board 27 are soldered 31 to the circuit pattern. At the time of this connection, the connection pin 22 is mechanically attached to the circuit board 27, and the connection pin 22 is movable between the electromagnetic device body 11 and the connection pin 22 in the axial direction of the coil bobbin 13. Then, with this soldering 31, the electromagnetic device body 11
Are mechanically attached to the circuit board 27 via the attachment pins 18 and are electrically connected to the circuit board 27 via the connection pins 22.

Further, the connection pin 22 is mechanically and electrically connected to the circuit board 27, and the electromagnetic device main body 11 and the connection pin 22 can be moved back and forth in the axial direction of the coil bobbin 13. However, it is not mechanically fixed. Therefore, when the electromagnetic device body 11 is mounted at an angle due to twisting or distortion of the coil bobbin 13 and bending of the mounting pin 18, the weight of the electromagnetic device body 11 is
18 Solder 31 part, and connect pin 22 solder 31
It does not hang on the part. In addition, the coil 15 of the electromagnetic device body 11
When the electromagnetic device body 11 vibrates due to energization to the external power source or external vibration, the connecting pin 22 moves relative to the axial direction of the coil bobbin 13 through the mounting hole 21 of the terminal block 20. As a result, the electromagnetic device body 11 vibrates, and the soldering 31 portion of the connection pin 22 is not stressed by the vibration.

Therefore, the soldering 31 portion of the connecting pin 22 is not subjected to stress due to the weight or vibration of the electromagnetic equipment main body 11, so that it is possible to prevent the soldering 31 portion from being cracked and causing a connection failure. Further, the work of confirming the connection status of the electromagnetic device main body 11 to the circuit board 27 and the manual soldering 31 when the electromagnetic device main body 11 is inclined and connected 31
Since it is not necessary to perform the work of correcting the parts, the assembling work is simplified, the manufacturability is improved, and the cost increase is reduced.

In the above embodiment, the coil bobbin 13 around which the coil 15 is wound is attached to the E-shaped laminated iron core 12 for explanation, but a core integrally formed of ferrite or the like is used or a separate terminal is used. The same effect can be obtained by any shape of the electromagnetic device body 11, such as the E-shaped laminated iron core 12 having the table 20 attached and the coil 15 wound directly.

Further, the E-shaped laminated iron core 12 has a coil bobbin 13
Even if it is more protruding, it can be mounted comfortably with the mounting pin.

[0021]

According to the electromagnetic device of the present invention, a mounting hole is formed in a coil bobbin on which a coil is wound and a mounting pin is provided so as to project in the protruding direction of the mounting pin. The mounting pin is used for fixing to the board, because one end of the connecting pin that electrically connects the end of the coil to the base is inserted into the base in a substantially parallel manner and the mounting pin and the connecting pin are soldered to the board. Therefore, the connecting pin is not subjected to a force that causes the vibration of the electromagnetic device body or the like, so that the electrical connection failure can be prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view of the vicinity of a terminal block in a state of being soldered and connected to a circuit board showing an embodiment of an electromagnetic device of the present invention.

FIG. 2 is a side view with a part thereof cut away.

FIG. 3 is a plan view of the same electromagnetic device body.

FIG. 4 is a plan view showing an example of a conventional electromagnetic device.

FIG. 5 is a partially cutaway side view showing a state in which the electromagnetic device body is soldered and connected to a circuit board.

[Explanation of symbols]

 11 Electromagnetic device main body 13 Coil bobbin 15 Coil 18 Mounting pin 21 Mounting hole 22 Connection pin 27 Circuit board which is the substrate 31 Soldering

Claims (1)

[Claims] 1. A coil bobbin around which a coil is wound, a mounting pin projecting from the coil bobbin and fixed by soldering to a substrate, and a mounting hole formed in the coil bobbin along a protruding direction of the mounting pin. An electromagnetic device comprising: a mounting pin which is inserted into the mounting hole so as to be capable of advancing and retracting substantially parallel to the mounting pin, electrically connected to an end of the coil, and fixed to the substrate by soldering.