JP2000208336A - Electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic component, wherein the mounting space on both front and rear surfaces of a circuit board is effectively used for preventing the occurrence of connection failure or falling of an electronic component from the circuit board. SOLUTION: In an electronic part 1, wherein a plurality of connection terminals 14 to be connected to a conductor pattern 33 formed at a circuit board P1 are fixed to a part main body, while being attachable to the circuit board P1 that a part of the part main body is positioned within a part main body insert hole 31 formed at the circuit board P1, an engagement means 16 is formed which allows temporary fitting of the part main body to a specified position of the circuit board P1, by engaging with an engagement means Pa on the side of circuit board 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component which can be mounted so that a part of a component main body is located in a component main body insertion hole formed in a circuit board.

[0002]

2. Description of the Related Art A transformer 51 shown in FIG. 11 is conventionally known as an electronic component which can be mounted on a circuit board. As shown in FIG.
Winding frame 52 configured to be able to wind windings W1 and W2
And cores 3 formed of, for example, a ferrite material. In this case, terminal fixing portions 53, 53 are respectively formed at both ends in the winding width direction of the winding frame 52, and a plurality of lead-like connection terminals 54, 53 are formed on the lower surface thereof.
, Are fixed respectively. On the other hand, the mounting circuit board P11 has a plurality of through holes 32, 32,... At positions corresponding to the formation positions of the connection terminals 54, 54,.
・ Is formed. In this case, as shown in FIG.
Through hole 32 on back surface Pb side of circuit board P11
Are formed around the lands 33 for soldering the connection terminals 54, 54,.

When the transformer 51 is mounted on the circuit board P11, first, the connection terminals 54, 54,... Are connected in the direction of the arrow A shown in FIG.
.., and as shown in FIG.
The bottom surface of 53 is brought into contact with the surface Pa. As a result, each connection terminal 54 has its tip protruding toward the back surface Pb by the height R1. Next, the circuit board P11 is turned upside down while holding down the transformer 51 so as not to fall off, and the connection terminals 54, 54,... Protruding toward the back surface Pb are soldered to the lands 33, 33,. As a result, the transformer 51 is fixed at a predetermined position on the front surface Pa side of the circuit board P1.

A surface-mounting transformer 61 shown in FIG. 13 includes a winding frame 62 configured to wind the windings W1 and W2, and cores 3 and 3. In this case, the terminal fixing portions 6 are provided at both ends of the winding frame 62 in the winding width direction.
3, 63 are formed, and a plurality of surface-mounting connection terminals 64, 64,. On the other hand, as shown in FIGS. 13 and 14, the connection terminals 6 are provided on the surface Pa of the mounting circuit board P12.
A plurality of lands 36 are formed at positions corresponding to the formation positions of 4, 64,.

When the transformer 61 is mounted on the circuit board P12, first, as shown in FIG. 14, the connection terminals 64, 64,... Contact the lands 36, 36,. Transformer 61 to circuit board P12
Position. Next, the connection terminals 64, 64,... Are soldered to the lands 36, 36,. Thereby, the transformer 61 is fixed at a predetermined position on the surface Pa side of the circuit board P12.

In these transformers 51 and 61, FIG.
As shown in FIGS. 2 and 14, the body of the transformer 51 excluding the projecting portion of the connection terminal 54 on the back surface Pb side, and the transformer 6
1 is located on the surface Pa side of the circuit boards P11 and P12 (hereinafter, referred to as “circuit board P” unless otherwise specified). In this case, in the circuit board P, the maximum mounting height of the mounted electronic components is defined as the height H1 on the front surface Pa side and the height H2 on the rear surface Pb side. For this reason, the transformers 51 and 61 are formed at the same height L1 as the height H1 which is the maximum mounting height on the surface Pa side.

Therefore, the windings W of the transformers 51, 61
To increase the number of turns of W1, W2, the transformer 51,
Since 61 is formed at the maximum mounting height, the winding frames 52, 6
The winding width of No. 2 must be increased. In such a case, the occupied area of the transformer on the circuit board P becomes large. For this reason, a transformer 71 shown in FIG. 15 has been devised as a transformer capable of winding a larger number of windings without effectively increasing the occupied area by effectively utilizing the dead space on the back surface Pb side.

The transformer 71 includes a winding frame 72 configured to be able to wind the windings W1 and W2, and cores 3 and 3. In this case, terminal fixing portions 73 are formed at both ends in the winding width direction of the winding frame 72, and a plurality of surface mounting connection terminals 24, 24,. Fixed. On the other hand, an insertion hole 31 having substantially the same shape as the outer shape of the transformer 71 is formed in the mounting circuit board P13 as shown in FIG. On the back surface Pb side of the circuit board P13, as shown in FIG. 16, a plurality of lands 36, 36,... Are formed at positions corresponding to the formation positions of the connection terminals 24, 24,. .

In mounting the transformer 71 on the circuit board P13, first, the transformer 71 is inserted into the insertion hole 31 in the direction of arrow B shown in FIG. 15 with the back surface Pb side of the circuit board P13 facing upward. And each connection terminal 2
Are positioned on the lands 36, 36,.... Next, in this state, the connection terminals 24, 24,... Are soldered to the lands 36, 36,. Thus, the transformer 71 is fixed at a predetermined position on the circuit board P13.

In the transformer 71, as shown in FIG. 16, a part of the main body is located in the insertion hole 31, and the terminal fixing portion 73 is a high mounting height on the rear surface Pb side of the circuit board P13. The height H2 is defined as the same height L1b.
Therefore, the component height is equal to the height L1 of the transformers 51 and 61.
Despite this, the maximum mounting height on the surface Pa side of the circuit board P13 is the height L1a obtained by subtracting the height L1b of the terminal fixing portion 73 and the thickness T of the circuit board P13 from the height L1. It is suppressed. Therefore, there is a margin with respect to the maximum mounting height H1 on the surface Pa side by the height L1b and the thickness T. Therefore, by increasing the height of the winding frame 72, the number of windings of the windings W1 and W2 can be increased without increasing the area occupied by the circuit board P13.

[0011]

However, the conventional transformer 71 has the following problems. That is, when the windings W1 and W2 generate abnormal heat while mounted on the circuit board P13, the solder fixing the connection terminals 24 and the lands 36 may be melted. For this reason, the conventional transformer 71 has a connection terminal 2
4 may be incompletely connected to the connection terminal 24 and the land 36 due to the floating or displacement from the land 36, or in the worst case, the transformer 71 may be connected to the circuit board P1.
There is a problem that it is dropped off from No. 3.

Further, in the conventional transformer 71, when the solder is mounted in a displaced state at the time of mounting,
The electrical connection between the connection terminals 24, 24,... And the lands 36, 36,. For this reason, the conventional transformer 71 has a problem that soldering must be performed while pressing the transformer 71 in order to prevent displacement during mounting, and sufficient attention must be paid to the soldering work. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is possible to effectively use a mounting space on both front and rear surfaces of a circuit board, and to prevent a connection failure and an electronic component from dropping off the circuit board. The main purpose is to provide electronic components that can be obtained. Another object of the present invention is to provide an electronic component that can be easily mounted on a circuit board with high positioning accuracy.

[0014]

According to a first aspect of the present invention, there is provided an electronic component, wherein a plurality of connection terminals for connecting to a conductor pattern formed on the circuit board are fixed to the component body. In an electronic component configured to be attachable to a circuit board so that a part of the component body is located in the component body insertion hole formed in the electronic component, a predetermined portion of the circuit board is engaged by engaging a locking means on the circuit board side. An engaging means capable of temporarily fixing the component body is formed at the position.

According to a second aspect of the present invention, there is provided the electronic component according to the first aspect, wherein the engagement means is configured to be insertable into an insertion hole formed in the circuit board. Characterized in that it is configured to be able to prevent detachment from the insertion hole due to the above.

According to a third aspect of the present invention, in the electronic component according to the second aspect, the engaging means is formed in a rivet shape having a resiliently deformable head, and is locked when inserted into the insertion hole. The head is engaged with the board surface of the circuit board as the means.

According to a fourth aspect of the present invention, in the electronic component according to the second aspect, the connection terminal has a lead shape.
A lead is formed on the lead to prevent detachment,
In the insertion state of the insertion hole, the barb is engaged with the board surface of the circuit board as the locking means.

An electronic component according to a fifth aspect is the electronic component according to any one of the first to fourth aspects, wherein the electronic component is a winding component.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which an electronic component according to the present invention is applied to a transformer will be described below with reference to the accompanying drawings. The conventional transformers 51, 61, 71
The same components as those described above are denoted by the same reference numerals, and redundant description will be omitted.

First, the configuration of the transformer 1 will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the transformer 1 has a winding frame 2 around which windings W1 and W2 are wound, and cores 3 and 3. The winding frame 2 has a winding W as shown in FIGS.
1 and W2 are formed so as to be wound, and a cylindrical portion 11 in which an insertion hole 11a into which the cores 3 and 3 can be inserted is formed therein, and flange portions formed at both ends of the cylindrical portion 11, respectively. 12, 12 and terminal fixing portions 13, 13 formed on the side surfaces of the flange portion 12, respectively, are integrally formed of an insulating resin. In this case, a plurality of lead-type connection terminals 14, 14,... Are fixed to both terminal fixing portions 13, respectively. Further, as shown in FIG. 4, windings W <b> 1 and W <b> 2
A plurality of grooves 15 for drawing out the connection terminal 14 side.

The connection terminal 14 is formed in an L-shape as shown in FIG.
3 buried. Each connection terminal 14 is provided with a return 16 for temporarily fixing the transformer 1 to the circuit board P1.
Are formed one by one. As shown in FIG. 3, the cores 3, 3 are formed in an E-shape that can be joined to each other using, for example, a ferrite material. When assembling the transformer 1, both ends of the insertion hole 11a are sandwiched so as to sandwich the winding frame 2. From each other, they are integrated in a state of being in planar contact with each other. On the other hand, as shown in FIG. 1, the mounting circuit board P1 has an insertion hole 31 corresponding to the component body insertion hole in the present invention, and a plurality of through holes 32, 32,.
And are formed. In this case, each through hole 32
Is formed at a position where the connection terminal 14 can be inserted in a state where the transformer 1 is inserted through the insertion hole 31, and its surface P
A land 33 is formed on the side a.

When the transformer 1 is mounted, first, with the back surface Pb of the circuit board P1 facing upward, as shown in FIG. 5A, the through terminals corresponding to the tips of the connection terminals 14, 14,. To face the holes 32, 32, ...
The transformer 1 is located above the insertion hole 31 of the circuit board P1. Next, the main body of the transformer 1 is inserted into the insertion hole 31 in the direction of the arrow B shown in FIG.
2, 32, etc. At this time, the barbs 16, 16 of the connection terminals 14 are brought into contact with the edge on the back surface Pb side of the circuit board P1 in which the through holes 32 are formed.
When it is pushed toward the connection terminal 14 in the directions of arrows E1 and E2 shown in FIG.
In the directions of arrows F1 and F2 shown in FIG. As a result, the transformer 1 is in a state where the surface Pa of the circuit board P1 faces upward, as shown in FIG.
Are engaged with the front surface Pa, and the terminal fixing portions 13, 13 are temporarily fixed to the circuit board P1 in a state where the upper surfaces of the terminal fixing portions 13, 13 are in contact with the back surface Pb of the circuit board P1.

Next, the connection terminals 14 protruding from the surface Pa are soldered to the lands 33. At this time, in the transformer 1, the transformer 1 is temporarily fixed to the mounting position with high accuracy by the return 16, so that the connection terminal 14 is prevented from falling off in the direction of the arrow G shown in FIG. I have. Therefore, unlike the conventional transformers 51, 61, and 71, the pressing of the transformer 1 is not required, so that the soldering can be easily performed.

In the mounted state, as shown in FIG. 2, a part of the main body of the transformer 1 is located in the insertion hole 31, so that the height L1b of the terminal fixing portion 13 is The thickness T of the circuit board P1 and the height L of the transformer 1
The height L1a subtracted from 1 is the surface P of the circuit board P1.
It protrudes to the a side. Therefore, rather than the maximum mounting height H1,
The mounting height can be reduced by the height L1b and the thickness T. In this state, even if the solder fixing the connection terminal 14 is melted due to abnormal heat generation of the windings W1 and W2, the transformer 1 is temporarily fixed by the barb 16, so that the circuit board P1 Is prevented from dropping out of the transformer 1.

Next, a transformer 21 according to another embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the transformer 1 and the conventional transformers 51, 61, and 71 are denoted by the same reference numerals, and redundant description will be omitted.

First, the configuration of the transformer 21 will be described with reference to the drawings.

The transformer 21 includes a winding frame 22 and cores 3 and 3 as shown in FIG. As shown in FIG.
As shown in FIG. 1, the cylindrical portion 11, the flange portions 12, 12, and the terminal fixing portions 23, 23 formed on the side surfaces of the flange portion 12 are integrally formed of an insulating resin. In this case, the plurality of connection terminals 2 of the surface mounting type are
Are fixed respectively. Further, the terminal fixing portion 23 is formed with projections 25, 25 corresponding to the engagement means in the present invention, respectively, facing upward. As shown in FIGS. 9 (a) and 9 (b), the projection 25 is formed as a stud which can be elastically deformed as a whole.
The engaging pawls 26, 26,...

On the other hand, as shown in FIG. 6, the mounting circuit board P2 has an insertion hole 31 and insertion holes 35 into which the projections 25 can be inserted.
On the side, as shown in FIG.
Are formed at positions that can face the connection terminals 14 in a state where they are inserted.

At the time of mounting, first, with the back surface Pb of the circuit board P2 facing upward, the transformer 21 is inserted into the insertion hole 31 in the direction of arrow B shown in FIG.
., Are inserted through the respective insertion holes 35, 35,. At this time, the projections 25 are elastically deformed in the directions of the arrows E1 and E2 shown in FIG. 10A by contacting the edge on the back surface Pb side of the circuit board P2 forming the insertion hole 35,
When projecting to the surface Pa, the arrow F shown in FIG.
By returning in the direction of 1, F2 and returning to the original state,
It engages with the surface Pa of the circuit board P2. Thereby, the transformer 21 is connected to the back surface P of the circuit board P2 as shown in FIG.
The terminal fixing portions 23 are temporarily fixed to the circuit board P2 while the upper surfaces of the terminal fixing portions 23 are in contact with b. Next, each connection terminal 24 is soldered to each land 36. At this time, this transformer 2
Even 1 is temporarily fixed in a state where it is positioned at a mounting position with high accuracy by the projection 25. Therefore, the transformer 2
Since the pressing of 1 is unnecessary, soldering can be performed extremely easily.

In the mounted state, as shown in FIG. 7, since a part of the main body of the transformer 21 is located in the insertion hole 31,
Similarly to the transformer 1, the height L1b of the terminal fixing portion 23
And the thickness T of the circuit board P2 are subtracted from the height L1 of the transformer 21, and the height L1a projects toward the surface Pa of the circuit board P2. Therefore, the mounting height can be made lower than the maximum mounting height H1 by the height L1b and the thickness T. Further, in this state, even if the solder fixing the connection terminal 24 is melted due to abnormal heat generation of the windings W1 and W2, the transformer 21 is temporarily fixed by the projection 25, so that the transformer 21 from the circuit board P2 is not fixed. 21 is prevented from falling off.

The present invention is not limited to the configuration shown in the above-described embodiment of the present invention. For example, in the embodiments of the present invention, an example in which the electronic component according to the present invention is applied to a transformer has been described. However, the electronic component according to the present invention is not limited to this, and may be applied to, for example, inductors, relays, resistors, capacitors, and the like. can do. Also, in the transformer 1, all connection terminals 14 return 1
Are formed, for example, the terminal fixing portion 1
Four connection terminals 1 arranged on both end sides of 3, 13
The barbs 16 and 16 may be formed only on the layers 4 and 14, respectively. Further, the projection 25 can be formed on a transformer having the lead type connection terminal 14.

The number of barbs 16 formed per connection terminal 14 can be arbitrarily defined.
Further, the head of the projection 25 can be divided into an arbitrary number. Further, the shape and formation position of the engagement means and the number of formations per electronic component in the present invention are not limited to the examples shown in the embodiments of the present invention.

[0034]

As described above, according to the electronic component of the first aspect, the engaging means for engaging the engaging means of the circuit board is formed, and the electronic means is provided at a predetermined position on the circuit board by the engaging means. By temporarily fixing the component body of the component, it is possible to effectively use the mounting space on both the front and back surfaces of the circuit board, and to prevent the occurrence of a connection failure and the detachment of the electronic component from the circuit board. Further, by providing the locking means at a predetermined position on the circuit board side, the locking means and the engaging means function as the positioning means, so that the electronic components can be easily mounted on the circuit board with high positioning accuracy. it can.

According to the electronic component of the second aspect,
The engagement means is configured to be able to be inserted through the insertion hole formed in the circuit board and to prevent the electronic component from being detached from the insertion hole due to its own weight. It is possible to prevent generation and dropping of electronic components.

Further, according to the electronic component of the third aspect, since the engaging means is formed in the form of a stud having an elastically deformable head, the occurrence of connection failure and the electronic component can be achieved with a simple configuration. Can surely be prevented from falling off.

According to the electronic component of the fourth aspect,
Since the connection terminal is formed with a bar for preventing disengagement, no other component is required as an engagement means, so that it is possible to reliably prevent the occurrence of a connection failure and dropping out at low cost.

Further, according to the electronic component of the fifth aspect,
By forming the engagement means on the winding component, it is possible to surely prevent the occurrence of connection failure of the connection terminal in the winding component, which may cause abnormal heat generation, and dropping from the circuit board.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a transformer 1 and a circuit board P1 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the transformer 1 mounted on a circuit board P1.

FIG. 3 is an exploded perspective view of the transformer 1 according to the embodiment of the present invention.

FIG. 4 is an external perspective view showing a bottom surface side of a winding frame 2 in the transformer 1 according to the embodiment of the present invention.

5A and 5B are enlarged views of the vicinity of the connection terminal 14 and the through hole 32, wherein FIG. 5A is a cross-sectional view immediately before the connection terminal 14 is inserted into the through hole 32, and FIG. 16 is a cross-sectional view of a state where
(C) is a sectional view showing a state in which the return bar 16 is engaged with the surface Pa of the circuit board P1.

FIG. 6 is an external perspective view of a transformer 21 and a circuit board P2 according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of the transformer 21 mounted on the circuit board P2.

FIG. 8 is an external perspective view of a winding frame 22 in a transformer 21 according to another embodiment of the present invention.

9A is a top view of the protrusion 25, and FIG.
It is NN line sectional drawing in (a).

10A is a cross-sectional view showing a state in which the engagement claw portion 26 of the projection 25 is elastically deformed in the insertion hole 35, and FIG.
FIG. 7 is a cross-sectional view showing a state where the engaging claw portion 26 is engaged with the surface Pa of the circuit board P2.

FIG. 11 is an external perspective view of a conventional transformer 51 and a circuit board P11.

FIG. 12 shows a transformer 5 mounted on a circuit board P11.
1 is a sectional view of FIG.

FIG. 13 is an external perspective view of a conventional transformer 61 and a circuit board P12.

FIG. 14 shows a transformer 6 mounted on a circuit board P12.
1 is a sectional view of FIG.

FIG. 15 is an external perspective view of a conventional transformer 71 and a circuit board P13.

FIG. 16 shows a transformer 7 mounted on a circuit board P13.
1 is a sectional view of FIG.

[Explanation of symbols]

 1 Transformer 14 Connection Terminal 16 Return 21 Transformer 24 Connection Terminal 25 Projection 26 Engaging Claw 31 Insertion Hole 32 Through Hole 33 Land 35 Insertion Hole 36 Land P1 Circuit Board P2 Circuit Board Pa Surface Pb Back Side

Continued on the front page (72) Inventor Taku Tanaka 1-20-23, Kamiikedai, Ota-ku, Tokyo F-term in Eiwa Co., Ltd. 5E043 AA02 AB01 EB01 EB03 EB06 5E059 AA10 LL17 5E070 AA11 AB10 BA08 CA12 DB02 EA08 EA10 EB02

Claims (5)

[Claims] A plurality of connection terminals for connecting to a conductor pattern formed on a circuit board are fixed to a component body, and a part of the component body is located in a component body insertion hole formed on the circuit board. In the electronic component configured to be attachable to the circuit board, an engaging means capable of temporarily fixing the component main body at a predetermined position on the circuit board by engaging with a locking means on the circuit board side is provided. An electronic component characterized by being formed. 2. The engaging means is configured to be able to be inserted into an insertion hole formed in the circuit board, and is configured to prevent the electronic component from being detached from the insertion hole due to its own weight in an engaged state. The electronic component according to claim 1, wherein: 3. The engaging means is formed in a rivet shape having an elastically deformable head, and when the engaging means is inserted into the insertion hole,
The electronic component according to claim 2, wherein the head is engaged with a board surface of the circuit board serving as the locking unit. 4. The connection terminal is in the form of a lead, and the lead is formed with a bar for preventing detachment. When the connection terminal is inserted into the insertion hole, the connection terminal of the circuit board as the locking means is provided. 3. The electronic component according to claim 2, wherein the barb engages with a substrate surface. 5. The electronic component according to claim 1, wherein the electronic component is a wound component.