JP6707973B2 - Method for fixing electrical component to printed circuit board, and printed circuit board, electrical component and auxiliary printed circuit board used for the method - Google Patents

Description

The present invention relates to a method of fixing an electric component having a connection terminal to a printed board.

Patent Document 1 discloses an electric component mounting structure for fixing electric components to a printed circuit board. In this electric component, a plurality of connection terminals each having a substantially circular cross section extend from the back surface. Further, a plurality of through holes corresponding to a plurality of connection terminals of the electric component are formed on the printed circuit board, and a pattern is wired between the through holes. The electrical component is fixed to the printed circuit board by inserting the connection terminals of the electrical component into the through holes of the printed circuit board and then soldering them together.

JP2012-134225A

In the electrical component mounting structure described in Patent Document 1, since the connection terminals of the electrical components are only inserted into the corresponding through holes of the printed circuit board and fixed by soldering, the electrical components may be vibrated during transportation or external force. A load is intensively applied to the solder fixing portion between the connection terminal and the printed circuit board, which may cause damage to the connection terminal of the electric component or separation of the electric component from the printed circuit board.

In addition, when fixing a relatively large and heavy electric component to a printed circuit board by soldering, the load applied to the solder fixing portion is further increased. , Will be more prominent.

According to the present invention, in a method of fixing an electric component having a connection terminal to a printed circuit board, an L-shaped fixing leg having a bent tip is provided on the same surface of the electric component as the surface having the connection terminal. An engagement hole into which the fixed leg can be inserted and a slit-shaped through hole extending along the bending direction of the tip portion are formed in the printed circuit board. Then, the connection terminal and the fixed leg are inserted into the through hole and the engagement hole, respectively, and the electric component is attached to the printed circuit board so that a tip end portion of the fixed leg engages with an opening edge of the engagement hole. Move along the plane of.

Therefore, in the fixing method of the present invention, the electric component is fixed to the printed board through both the connection terminal and the L-shaped fixing leg.

According to the present invention, the tip end of the L-shaped fixed leg is mechanically engaged with and supported by the opening edge of the engagement hole, and the fixing point between the printed circuit board and the electric component is fixed to the printed circuit board. Since the number of fixing portions between the legs increases, the fixing strength of the electric component to the printed circuit board increases.

(A) is a bottom view of the electric component of one example, and (b) is a side view of the electric component. FIG. 2 is an enlarged view of the periphery of a fixed leg on the lower side of the electric component of FIG. (A) is the figure which looked at the printed circuit board of one example from the back side, and (b) is a side view of the printed circuit board. The process of inserting the electric component in the fixing method of the embodiment is shown, (a) is a view seen from the back side of the printed board, and (b) is a side view. The movement process of the electric component in the fixing method of one Example is shown, (a) is the figure seen from the back surface side of a printed circuit board, (b) is a side view. The soldering process of the fixing method of one Example is shown, (a) is the figure seen from the back surface side of a printed circuit board, (b) is a side view. (A) is the figure seen from the back side of the printed circuit board of a 2nd example, (b) is a side view of the printed circuit board. (A) is the figure seen from the back surface side of the auxiliary printed circuit board of a 2nd example, and (b) is a side view of the auxiliary printed circuit board. It is a perspective view which shows the attachment process of the auxiliary printed circuit board in the fixing method of a 2nd Example. It is explanatory drawing which shows the arrangement|positioning of an electrical component after mounting an auxiliary printed circuit board, a printed circuit board, and an auxiliary printed circuit board, (a) is the figure seen from the back surface side of an auxiliary printed circuit board, (b) is a side view. Is. The soldering process of a 2nd Example is shown, (a) is the figure seen from the back surface side of an auxiliary printed circuit board, (b) is a side view.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electric component 1 used in the fixing method of the present invention. The electric component 1 is, for example, a pulse transformer or a capacitor. The electric component 1 has an upper wall surface 2, a lower wall surface 3 and four side wall surfaces 4, 4, 4, 4. As shown in FIG. 1B, a connector 5 for inserting a plug (not shown) is attached to the upper wall surface 2.

Further, four connection terminals 6, 6, 6, 6 made of metal are provided on the lower wall surface 3, and these connection terminals 6, 6, 6, 6 are as shown in FIG. , Are located near the four corners 7, 7, 7, 7 of the rectangular lower wall surface 3, respectively. Each connection terminal 6 has a columnar shape, and extends from the lower wall surface 3 so as to be substantially orthogonal to the lower wall surface 3, as shown in FIG.

Further, the lower wall surface 3 having the connection terminals 6 is provided with four metal fixing legs 8, 8, 8, 8. As shown in FIG. 1A, the four fixed legs 8, 8, 8, 8 are located at the four corners 7, 7, 7, 7 of the rectangular lower wall surface 3, respectively. The four fixed legs 8, 8, 8 and 8 are formed in substantially the same shape, and each fixed leg 8 has a substantially L-shape as a whole by bending the tip end portion of a member having a quadrangular prism shape. ing. Therefore, as shown in FIG. 2, each fixed leg 8 includes a base portion 9 extending substantially orthogonal to the lower wall surface 3 and a tip portion 10 bent downward so as to be substantially parallel to the lower wall surface 3. ing.

In the upper two fixed legs 8 and 8 of FIG. 1(a), as shown in FIG. 1(b), the upper side surface 9a of each base portion 9 is flush with the upper side wall surface 4, and each tip portion is 10 extends below the side wall surface 4. On the other hand, in the lower two fixed legs 8 and 8 of FIG. 1A, the lower side surface 9b of each base 9 is flush with the lower side wall surface 4 as shown in FIG. 1B. The respective tip portions 10 extend below the lower side wall surface 4. Therefore, when the electrical component 1 is viewed from the lower wall surface 3 side, as shown in FIG. 1A, the tip portions 10, 10 of the upper two fixing legs 8, 8 are the upper corner portions of the lower wall surface 3. 7 and 7, the tip portions 10, 10 of the lower fixed legs 8, 8 respectively project outside the lower corner portions 7, 7 of the lower wall surface 3.

Here, in FIG. 2, the length of the fixed leg 8 including the tip portion 10 along the vertical direction in FIG. 1 (hereinafter, referred to as “fixed leg vertical direction length”) is “L1”.

Further, as shown in FIG. 2, the distance between the lower wall surface 3 of the electric component 1 and the tip end portion 10 of the fixed leg 8 is defined as “D”. The distance D is set so as to correspond to the thickness T (see FIG. 3B) of the printed circuit board 11 described later.

Next, with reference to FIG. 3, the printed circuit board 11 to which the electric component 1 is attached will be described. The printed circuit board 11 is made of, for example, a synthetic resin substrate and is provided with an appropriate printed circuit. The printed circuit board 11 has a surface (a surface on the right side in FIG. 3(b)) 11a which is the lower wall surface 3 side of the electric component 1 when mounted, and a back surface (a surface on the left side in FIG. 3(b)) opposite to the surface 11a. ) 11b. On the printed circuit board 11, four slit-shaped engaging holes 12, 12, 12, 12 are formed at positions corresponding to the four fixing legs 8, 8, 8, 8 of the electric component 1. The engagement hole 12 has a substantially rectangular shape and extends along the vertical direction of FIG. The length L2 of the long side 13 of the engagement hole 12 is set to be slightly larger than the vertical length L1 of the fixed leg. The length L3 of the short side 14 of the engagement hole 12 corresponds to the width W of the fixed leg 8 (see FIG. 1A). Therefore, the distal end portion 10 of the fixed leg 8 can be inserted into each engagement hole 12.

Similarly, on the printed circuit board 11, four slit-shaped through holes 15, 15, 15, 15 are respectively provided at positions corresponding to the four columnar connection terminals 6, 6, 6, 6 of the electric component 1. Has been formed. Each through hole 15 has an oval shape and extends parallel to the engagement hole 12. In other words, the through hole 15 extends along the bending direction of the fixed leg 8 (the direction in which the tip portion 10 extends) when the fixed leg 8 is inserted into the engagement hole 12. The length L4 of the slit-shaped through hole 15 along the vertical direction in FIG. 3 is obtained by subtracting the length between the upper side surface 9a and the lower side surface 9b of the base from the length L2 of the long side 13 of the engagement hole 12. It is set to be slightly larger than the one you did. The length L5 of the through hole 15 along the left-right direction in FIG. 3A corresponds to the diameter of the connection terminal 6 having a substantially circular cross section.

Note that, in FIG. 3B, the engagement hole 12 is shown by a broken line, while the through hole 15 is shown by a chain line.

Next, a method of fixing the electric component 1 to the printed board 11 according to the embodiment of the present invention will be described.

First, as shown in FIG. 4B, the connection terminals 6 and the fixed legs 8 of the electric component 1 are inserted into the corresponding through holes 15 and engagement holes 12 of the printed circuit board 11, respectively. The connection terminals 6 and the fixed legs 8 are inserted by arranging the printed circuit board 11 so that the front surface 11a and the back surface 11b extend in a substantially vertical direction, and then moving from the right side to the left side in FIG. This is done by moving the electric component 1 to A). When the connection terminals 6 and the fixed legs 8 are inserted, the connection terminals 6 are located at the upper ends 15A of the oval through holes 15 as shown in FIG. The base 9 of 8 is located at the upper end 12A of the generally rectangular engagement hole 12. That is, the connection terminal 6 and the fixed leg 8 are loosely fitted in the through hole 15 and the engagement hole 12, respectively.

In the side view of FIG. 4B, the base portion 9 of the fixed leg 8 inside the engagement hole 12 and the connection terminal 6 inside the through hole 15 are actually hidden, but these base portions are shown for convenience of explanation. 9 and the connection terminal 6 are shown in solid lines.

Next, as shown in FIG. 5B, the electric component 1 is fixed so that the tip 10 of the fixed leg 8 is engaged with the opening edge 18 of the engaging hole 12 at the lower end 12B of the engaging hole 12. The component 1 is moved downward (moving direction B) along the surface 11a of the printed board 11. After the electric component 1 is moved, the printed circuit board 11 having the thickness T is provided between the lower wall surface 3 of the electric component 1 and the tip portion 10 of the fixed leg 8 which are separated from each other by the distance D corresponding to the thickness T. It will be sandwiched.

Then, as shown in FIG. 6A, the connection terminals 6 and the printed circuit board 11 are fixed to each other by soldering shown by dots from the back surface 11b side of the printed circuit board 11. As a result, the connection terminal 6 is electrically connected to the printed board 11.

Similarly, the fixing legs 8 and the printed circuit board 11 are fixed to each other by soldering, which is also shown by dots, from the back surface 11b side of the printed circuit board 11.

As described above, in the present embodiment, the electric component 1 is fixed to the printed circuit board 11 by soldering through the connection terminal 6 and the substantially L-shaped fixing leg 8, so that the tip 10 of the fixing leg 8 is engaged. Support by mechanical engagement with the opening edge 18 of the hole 12 is obtained, and a fixing point between the printed circuit board 11 and the electric component 1 is provided as an additional solder fixing portion between the printed circuit board 11 and the fixing leg 8. Can be increased by the amount of. As a result, the fixing strength of the electric component 1 to the printed circuit board 11 is increased, and the load applied to the solder fixing portion between the printed circuit board 11 and the connection terminal 6 is reduced. Therefore, a load is concentrated on the solder fixing portion between the printed circuit board 11 and the connection terminal 6 due to vibration during transportation or external force, the connection terminal 6 is damaged, and the electric component 1 is removed from the printed circuit board 11. It is possible to suppress the problem of detachment. It should be noted that the above-mentioned problem becomes more remarkable when, for example, a relatively large and heavy electric component such as a pulse transformer or a capacitor is fixed to the printed circuit board 11, but a book providing an additional fixing point is provided. The fixing method of the embodiment can handle such a case.

Next, the printed circuit board 11 used in the second embodiment of the present invention will be described. As shown in FIG. 7A, the printed circuit board 11 of the second embodiment is provided with a cylindrical auxiliary terminal 19 at a position laterally offset from the lower end portion 15B of each through hole 15. As shown in FIG. 7B, the auxiliary terminal 19 projects from the back surface 11b of the printed board 11 so as to be substantially orthogonal to the printed board 11. The auxiliary terminal 19 is connected to a pattern 20 that electrically connects with a circuit (not shown) in the printed board 11.

Further, as shown in FIG. 7A, the printed circuit board 11 has two substantially rectangular through-holes 21 and 21 for protrusions between the upper two engaging holes 12 and 12. The through hole 21 for the projecting portion extends so as to be substantially orthogonal to the longitudinal direction of each engagement hole 12.

Next, the auxiliary printed circuit board 23 that strengthens the fixation of the electric component 1 to the printed circuit board 11 will be described. The auxiliary printed circuit board 23 is formed of, for example, a synthetic resin substrate. In the present embodiment, the auxiliary printed circuit board 23 includes two engaging holes 12 and 12 on the upper side of the printed circuit board 11, two through holes 21 and 21 for projecting portions and four auxiliary holes from the back surface 11b side of the printed circuit board 11. It is formed in a size that can cover the terminals 19, 19, 19, 19. The auxiliary printed circuit board 23 has a front surface (a surface on the right side in FIG. 8B) 23a that is in contact with the rear surface 11b of the printed circuit board 11 when mounted, and a rear surface on the side opposite to the front surface 23a (a surface on the left side in FIG. 8B). 23b.

On the auxiliary printed board 23, four circular through-holes 24, 24, 24, 24 for connecting terminals are formed at positions corresponding to the four connecting terminals 6, 6, 6, 6 of the electric component 1, respectively. There is. Each through hole 24 for connection terminals has a diameter corresponding to the columnar connection terminal 6.

Further, on the auxiliary printed board 23, four circular through-holes 25, 25, 25, 25 for auxiliary terminals are formed at positions corresponding to the four auxiliary terminals 19, 19, 19, 19 of the printed board 11, respectively. Has been done. Each of the auxiliary terminal through holes 25 has a diameter corresponding to the cylindrical auxiliary terminal 19.

As shown in FIG. 8A, the connection terminal through hole 24 and the auxiliary terminal through hole 25 are connected to each other by a pattern 26.

The connection terminal through hole 24 and the auxiliary terminal through hole 25 correspond to the "second through hole" and the "third through hole" in the claims, respectively.

Furthermore, the auxiliary printed circuit board 23 is provided with two rectangular through holes 27 for fixing legs, respectively, so as to avoid interference with the tip portions 10, 10 of the upper two fixing legs 8, 8 of the electric component 1. There is.

Further, as shown in FIG. 8B, two plate-shaped projecting portions 28, 28 are provided on the surface 23a of the auxiliary printed board 23 so as to project in a direction substantially orthogonal to the auxiliary printed board 23. .. The two projecting portions 28, 28 are respectively inserted into the corresponding two projecting portion through holes 21, 21 of the printed circuit board 11. The protrusion length L6 of the protrusion 28 is set to be larger than the thickness T of the printed circuit board 11. The two through-holes 21 and 21 for protrusions correspond to the positions of the upper side wall surface 4 in the final mounting position of the electric component 1.

Next, the fixing method of the second embodiment will be described. The steps of inserting and moving the electric component 1 in the second embodiment are the same as those in the first embodiment. After the movement of the electric component 1, as shown in FIG. 9, the connection terminal 6 penetrating the elliptical through hole 15 of the printed circuit board 11 and the auxiliary terminal 19 of the printed circuit board 11 are arranged in the lateral direction of FIG. They are adjacent to each other and project from the back surface 11b of the printed circuit board 11.

In the step of mounting the auxiliary printed circuit board 23 shown in FIG. 9, the auxiliary printed circuit board 23 is mounted on the printed circuit board 11 from which the connection terminals 6 and the auxiliary terminals 19 project as described above. At this time, the connection terminal 6, the auxiliary terminal 19 and the tip portion 10 of the fixed leg 8 are inserted into the corresponding connection terminal through hole 24, auxiliary terminal through hole 25 and fixed leg through hole 27 of the auxiliary printed circuit board 23. Thus, the auxiliary printed circuit board 23 is moved in the direction indicated by the arrow C in FIG. At this time, the two projecting portions 28, 28 provided on the auxiliary printed circuit board 23 are inserted into the corresponding two projecting through holes 21, 21 of the printed circuit board 11, respectively.

In the state where the auxiliary printed circuit board 23 is attached to the printed circuit board 11, each projecting portion 28 projects from the surface 11a of the printed circuit board 11 toward the electric component 1 side as shown in FIG. The lower side surface 28a is in contact with the upper side wall surface 4 of the electric component 1.

Then, as shown in FIG. 11A, the connection terminals 6 and the auxiliary terminals 19 are fixed to the auxiliary printed board 23 by soldering from the back surface 23b side of the auxiliary printed board 23, respectively. As a result, the corresponding connection terminals 6 and auxiliary terminals 19 are electrically connected via the pattern 26. Further, since the auxiliary terminal 19 is electrically connected to a circuit (not shown) in the printed board 11, the connection terminal 6 electrically connected to the auxiliary terminal 19 is electrically connected to the circuit in the printed board 11.

As described above, in the second embodiment, the connection terminals 6 and the auxiliary terminals 19 are respectively inserted into the connection terminal through holes 24 and the auxiliary terminal through holes 25 provided in the auxiliary printed circuit board 23 and then soldered. Since this is done, the soldering can be performed stably.

Further, in the second embodiment, since the upward movement of the electric component 1 is restrained by the protruding portion 28 provided on the auxiliary printed circuit board 23, the electric component is prevented from vibrating during transportation or due to external force. It is possible to reduce the load applied to 1 and to more securely maintain the engagement of the fixed legs 8 to strengthen the fixation of the electric component 1 to the printed circuit board 11.

In addition, in each of the above-described embodiments, an example in which four connection terminals 6, through holes 15, fixed legs 8 and engagement holes 12 are used is disclosed, but the number of these constituent elements is arbitrary, and for example, connection The present invention can be applied to a configuration in which each of the terminal 6, the through hole 15, the fixed leg 8 and the engaging hole 12 is used.

DESCRIPTION OF SYMBOLS 1... Electrical component 6... Connection terminal 8... Fixed leg 9... Base 10... Tip 11... Printed circuit board 12... Engagement hole 15... Through hole 19... ..Auxiliary terminal 20...Pattern 21...Projection through hole 23...Auxiliary printed circuit board 24...Connecting terminal through hole 25...Auxiliary terminal through hole 26...Pattern 28... ..Protruding parts

Claims (6)

In a method of fixing an electric component having a connection terminal to a printed circuit board,
An L-shaped fixed leg whose tip is bent is provided on the same surface of the electric component as the surface having the connection terminal,
In the printed board, an engagement hole into which the fixed leg can be inserted, and a slit-shaped through hole extending along the bending direction of the tip portion are formed,
The connection terminal and the fixed leg are respectively inserted into the through hole and the engagement hole,
Moving the electric component along the surface of the printed circuit board so that the tip end of the fixed leg engages with the opening edge of the engagement hole ;
An auxiliary terminal is provided on the printed circuit board,
An auxiliary printed circuit board having a circular second through hole and a circular third through hole corresponding to the connection terminal and the auxiliary terminal and having a pattern for connecting both through holes is provided.
The connection terminal and the auxiliary terminal are respectively inserted into the second through hole and the third through hole,
A method of fixing an electric component to a printed circuit board, comprising fixing the connection terminal and the auxiliary terminal to the auxiliary printed circuit board by soldering . The auxiliary printed circuit board is provided with a protrusion that penetrates through the printed circuit board and protrudes toward the electric component, and the protrusion contacts the side surface of the electric component to constrain the electric component. The method for fixing an electric component to a printed circuit board according to claim 1, which is characterized in that. Printed substrate used in the fixing method according to claim 1 or 2. Electrical components used in the fixing method according to claim 1 or 2. The electric component according to claim 4 , wherein the electric component includes four connection terminals and four fixing legs. Auxiliary printed circuit board used in the fixing method according to claim 1 or 2.

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