JP2015082589A - Crimping metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably bring conductor circuits on both sides of a flexible circuit board into conduction.SOLUTION: A crimping metal fitting 1 comprises: a lower plate part 10 having a first connection protrusion 11 which comes into contact with a conductor 92 formed on one side of a flexible circuit board 90; an upper plate part 20 having a second connection protrusion 21 which faces the first connection protrusion 11, and which comes into contact with a conductor 93 formed on the other side; and a plurality of barrel parts 16 and 17 which are provided to stand on at least one of a pair of lateral parts on the shorter side of at least one of the lower plate part 10 and the upper plate part 20. By folding, with the flexible circuit board 90 sandwiched between the lower plate part 10 and the upper plate part 20, the barrel parts 16 and 17 so that their tips 16a and 17a comes closer to the lateral part on the side opposite, in the shorter-side direction, to the side provided with the barrel parts, the crimping metal fitting 1 is crimped to the flexible circuit board 90 while bringing the conductors 92 and 93 into conduction via the lower plate part 10 and the upper plate part 20.

Description

  The present invention relates to a crimping fitting for conducting conductor circuits formed on both surfaces of a flexible circuit board.

  Conventionally, in a flexible circuit board in which conductor circuits are formed on the front and back surfaces of a flexible board body, for example, a conductive ink is printed and filled in a through hole formed in the board body. The ink is electrically connected to the front and back conductor circuits (see, for example, Patent Document 1 below).

JP 2007-214239 A

  However, in the above-described prior art, in recent ultra-thin flexible circuit boards, when conductive ink is printed in the through hole, the conductive ink does not enter the through hole or the entire surface of the through hole is not filled. There has been no denying the possibility of poor conduction due to the lack of conductive ink.

  An object of the present invention is to provide a crimping fitting capable of solving the above-described problems caused by the prior art and reliably connecting the conductive circuits on both sides of a flexible circuit board.

  A crimping fitting according to the present invention is formed on a first plate portion having a first protrusion that contacts a first conductor circuit formed on one surface side of a flexible circuit board, and on the other surface side of the flexible circuit board. A second plate portion having a second protrusion portion that contacts the formed second conductor circuit and faces the first protrusion portion, and a pair of lateral portions in at least one of the first and second protrusion portions. The flexible circuit board by bending the barrel part inward with the flexible circuit board sandwiched between the first plate part and the second plate part. The first and second conductor circuits are electrically connected by the first and second plate portions while being crimped to the substrate.

  According to the crimping fitting according to the present invention, the first and second plate parts are crimped to the board by the bent barrel part with the flexible circuit board sandwiched therebetween, and are formed on both surfaces of the flexible circuit board. Since the conducted first and second conductor circuits are conducted, the conductor circuits can be reliably conducted as compared with the case where the conductive ink is printed in the through hole.

  In one embodiment of the present invention, the first and second plate portions are connected at one side in the longitudinal direction by a connecting portion.

  According to the present invention, the conductive circuits on both sides of the flexible circuit board can be reliably conducted.

It is a perspective view which shows the crimping fitting which concerns on the 1st Embodiment of this invention. It is a perspective view which shows a mode that the crimping | compression-bonding metal fitting was crimped | bonded to the flexible circuit board. It is A-A 'sectional drawing of FIG. FIG. 3 is a B-B ′ sectional view of FIG. 2. It is a perspective view which shows the crimping fitting which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows a mode that the crimping | compression-bonding metal fitting was crimped | bonded to the flexible circuit board. It is C-C 'sectional drawing of FIG. It is a perspective view which shows the crimping fitting which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows a mode that the crimping | compression-bonding metal fitting was crimped | bonded to the flexible circuit board. FIG. 10 is a cross-sectional view taken along the line D-D ′ of FIG. 9.

  Hereinafter, a crimp fitting according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a perspective view showing a crimping fitting according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a state where the crimping fitting is crimped to the flexible circuit board. 3 is a cross-sectional view taken along the line AA ′ in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB ′ in FIG. As shown in FIGS. 1 to 4, the crimping fitting 1 according to the first embodiment is a fitting that is crimped to a flexible circuit board 90 (see FIG. 2) such as a membrane circuit or a flexible printed circuit. The conductive circuits formed on the front and back surfaces of the 90 substrate bodies 91 (see FIGS. 3 and 4) are electrically and mechanically connected to each other.

  The crimp fitting 1 is disposed on the back surface side of the flexible circuit board 90, for example, and a first connection protrusion 11 that contacts the conductor 92 (see FIGS. 3 and 4) of the back circuit formed on the back surface side. The lower plate part 10 which has the 1st and 2nd crimping | compression-bonding projection parts 12 and 13 for assisting the contact of the 1 connection projection part 11 is provided.

  The crimp fitting 1 is disposed on the surface side of the flexible circuit board 90, for example, and contacts the surface circuit conductor 93 (see FIGS. 3 and 4) formed on the surface side. A second connection protrusion 21 formed at a position facing the connection protrusion 11 and the flexible circuit board 90, and third and fourth crimp protrusions 22 for assisting the contact of the second connection protrusion 21. , 23.

  Further, the crimp fitting 1 includes, for example, a plurality of barrel portions 16 and 17 erected in a plate thickness direction on a pair of side portions 14 and 15 in a short direction intersecting with a longitudinal direction of the lower plate portion 10, and a lower plate portion. 10 and the connection piece 29 which connects one edge parts of the longitudinal direction of the upper board part 20 are provided. The crimp fitting 1 is formed by punching / bending a plate-shaped metal base material having conductivity such as copper or brass into a predetermined shape, for example. The lower plate portion 10 and the upper plate portion 20 are For example, it is formed to have a rectangular strip-shaped outer shape.

  The lower plate portion 10 and the upper plate portion 20 are provided to sandwich the flexible circuit board 90 therebetween. The lower plate portion 10 and the upper plate portion 20 have first and second connection protrusions 11 and 21 near the center in the longitudinal direction, respectively. Further, the lower plate portion 10 and the upper plate portion 20 are respectively adjacent to the first and second connection projection portions 11 and 21 in the longitudinal direction, respectively, and the first and second crimping projection portions 12 and 13 and the third and fourth crimping portions. Protrusions 22 and 23 are provided.

  The first crimping projection 12 and the third crimping projection 22, and the second crimping projection 13 and the fourth crimping projection 23 are formed at positions facing each other across the flexible circuit board 90. Yes. The first connecting projection 11, the first and second crimping projections 12 and 13 of the lower plate portion 10 are formed so as to protrude toward the upper surface 10 a of the lower plate portion 10. Further, the second connection projection 21, the third and fourth crimping projections 22 and 23 of the upper plate portion 20 are formed so as to protrude toward the lower surface 20 a side of the upper plate portion 20.

  Of the pair of side portions 14 and 15 of the lower plate portion 10, the side portion 14 is one side portion along the longitudinal direction of the lower plate portion 10, and faces the upper surface 10 a with the connecting piece 29 facing upward. It is located on the left side. Moreover, the side part 15 is the other side part along the longitudinal direction of the lower board part 10, and is located in the right side seeing toward the upper surface 10a in the state which made the connection piece 29 upward.

  The side portion 14 is erected so that the barrel portion 16 protrudes toward the upper surface 10 a at a position closer to the coupling piece 29 than the first connection projection portion 11. Further, the side portion 15 is erected so that the barrel portion 17 protrudes toward the upper surface 10 a at a position farther from the coupling piece 29 than the first connection projection portion 11.

  The first connection protrusion 11 is a portion that mainly serves as an electrical contact with the conductor 92 of the flexible circuit board 90, and is formed so as to protrude toward the upper plate portion 20 as shown in FIG. Yes. The first connecting projection 11 has a central portion in the short direction between the side portions 14 and 15 of the lower plate 10 and the longitudinal direction so that the longitudinal direction thereof substantially coincides with the longitudinal direction of the lower plate 10. It is located in the center part between the barrel parts 16 and 17.

  The first and second crimping protrusions 12 and 13 are formed so as to protrude toward the upper plate part 20, similarly to the first connection protrusion 11. These first and second crimping projections 12 and 13 are mainly used for mechanically crimping and fixing the flexible circuit board 90 between the third and fourth crimping projections 22 and 23 of the upper plate portion 20. Is provided.

  The first crimping protrusion 12 has a barrel at the center portion in the short direction between the side portions 14 and 15 of the lower plate portion 10 so that the longitudinal direction thereof substantially coincides with the short direction of the lower plate portion 10. It is located at a location closer to the connecting piece 29 than the first connection projection 11 so that the formation position of the portion 16 corresponds to the position in the longitudinal direction of the lower plate portion 10.

  The second crimping protrusion 13 has a barrel at the center portion in the short direction between the side portions 14 and 15 of the lower plate portion 10 so that the longitudinal direction thereof substantially coincides with the short direction of the lower plate portion 10. It is located at a location farther from the connecting piece 29 than the first connection projection 11 so that the formation position of the portion 17 corresponds to the position in the longitudinal direction of the lower plate portion 10.

  The barrel parts 16 and 17 are made of plate-like members, and as shown in FIG. 4, the front end parts 16a and 17a in the standing direction approach the side parts 15 and 14 opposite to the barrel part forming side in the short direction. The upper plate part 20 is fixed by bending in this manner. In addition, the barrel parts 16 and 17 may have the formation position in the side parts 14 and 15 reverse to the above.

  On the other hand, the second connection protrusion 21 is a portion that mainly serves as an electrical contact with the conductor 93 of the flexible circuit board 90 and is formed so as to protrude toward the lower plate 10 as shown in FIG. Has been. The second connection projection 21 is located at the center of the short direction and the long direction of the upper plate part 20 so that the long direction thereof substantially coincides with the short direction of the upper plate part 20. It faces the first connection protrusion 11 of the portion 10. The longitudinal direction of the second connection protrusion 21 and the longitudinal direction of the first connection protrusion 11 are orthogonal to each other when seen in a plan view.

  The third and fourth crimping protrusions 22 and 23 are formed so as to protrude toward the lower plate part 10, similarly to the second connection protrusion 21. These third and fourth crimping protrusions 22 and 23 are mainly used for mechanically crimping and fixing the flexible circuit board 90 between the first and second crimping protrusions 12 and 13 of the lower plate part 10. Is provided.

  The third crimping protrusion 22 is a first crimping protrusion of the lower plate portion 10 at the center portion in the short direction of the upper plate portion 20 so that the longitudinal direction thereof substantially coincides with the longitudinal direction of the upper plate portion 20. It is located at a location closer to the coupling piece 29 than the second connection projection 21 in the longitudinal direction of the upper plate portion 20 so as to face the portion 12.

  The fourth crimping protrusion 23 is the second crimping protrusion of the lower plate part 10 at the central portion in the short direction of the upper plate part 20 so that the longitudinal direction thereof substantially coincides with the longitudinal direction of the upper plate part 20. It is located at a location farther from the connecting piece 29 than the second connection projection 21 in the longitudinal direction of the upper plate portion 20 so as to face the portion 13.

  The longitudinal direction of the third and fourth crimping projections 22 and 23 and the longitudinal direction of the first and second crimping projections 12 and 13 are orthogonal to each other when seen in a plan view. The value obtained by adding the heights from the upper surface 10a and the lower surface 20a of the first and second connection projections 11 and 21 is, for example, the upper surface 10a of the first crimping projection 12 and the third crimping projection 22 and It is set to be larger than the value obtained by adding the height from the lower surface 20a.

  The value obtained by adding the heights from the upper surface 10a and the lower surface 20a of the first and second connection projections 11 and 21 is, for example, the upper surface 10a of the second crimping projection 13 and the fourth crimping projection 23, and It is set to be larger than the value obtained by adding the height from the lower surface 20a. As a result, when the flexible circuit board 90 is sandwiched and pressure-bonded between the lower plate portion 10 and the upper plate portion 20, the upper plate portion 20 is slightly in the opposite direction to the lower plate portion 10 as shown in FIG. It is comprised so that it may bend.

Next, the operation of the crimping fitting 1 according to the first embodiment will be described.
When the crimping fitting 1 is crimped to the flexible circuit board 90, first, the barrel portions 16 and 17 of the lower plate portion 10 of the lower plate portion 10 and the upper plate portion 20 in the unfolded state in which the connecting piece 29 is extended, The flexible circuit board 90 is placed on the upper surface 10 a of the lower plate portion 10 so that the first connection protrusion 11 is in contact with the conductor 92 through the through hole 99 formed in the flexible circuit board 90 as shown in FIG. To do.

  The conductors 92 and 93 of the flexible circuit board 90 may be exposed at least at locations corresponding to the first and second connection projections 11 and 21, but the first and second connection projections 11 and 21 and It is preferable that not only the corresponding portions but also the portions corresponding to the first to fourth crimping protrusions 12, 13, 22, and 23 are exposed. In the illustrated example, a cover lay 94 is provided in addition to the crimping location of the crimping fitting 1.

  Next, the connecting piece 29 is bent toward the flexible circuit board 90 side on the lower plate portion 10, and the upper plate portion 20 is disposed on the lower plate portion 10 with the lower surface 20a on the lower side. 21 is brought into contact with the flexible circuit board 90 so as to be positioned on the first connection protrusion 11 while being in contact with the conductor 93.

  Finally, the front end portions 16a and 17a of the barrel portions 16 and 17 are bent as described above, and the upper surface side of the upper plate portion 20 is pressed. In the upper plate part 20 pressed in this way, the pressing force by the barrel parts 16 and 17 is transmitted to the third and fourth crimping protrusions 22 and 23, so that these third and fourth crimping protrusions 22 and 23 are transmitted. Strongly presses the flexible circuit board 90.

  On the other hand, as described above, the first and second crimping projections 12 and 13 are formed on the lower plate 10 so as to face the third and fourth crimping projections 22 and 23 of the upper plate 20. Therefore, the flexible circuit board 90 is sandwiched and crimped between the first and third crimping projections 12 and 22 and the second and fourth crimping projections 13 and 23, respectively.

  In the crimping fitting 1 according to the first embodiment, the pressing force of the barrel portions 16 and 17 is thus between the first and third crimping projections 12 and 22 and the second and fourth crimping projections 13 and 23. Therefore, the crimp fitting 1 is crimped to the flexible circuit board 90 with a very strong crimp strength.

  Further, as described above, the first and third crimping protrusions 12 and 22 are orthogonal to each other and the second and fourth crimping protrusions 13 and 23 are orthogonal to each other in plan view. The flexible circuit board 90 can be securely sandwiched between the first and third pressure-bonding protrusions 12 and 22 and the second and fourth pressure-bonding protrusions 13 and 23 even if they are slightly displaced from the plate portion 10. .

  As described above, when the barrel portions 16 and 17 press the upper plate portion 20, the pressing force is transmitted to the second connection projection portion 21 located between the third and fourth crimping projection portions 22 and 23. Then, the second connection protrusion 21 also presses the flexible circuit board 90. The straight line connecting the centers of the first and second crimping projections 12 and 13 passes through the first connection projection 11, and the straight line connecting the centers of the third and fourth crimping projections 22 and 23 is the second connection projection. Passing through the part 21, these straight lines overlap in plan view. Therefore, the pressing force of the barrel portions 16 and 17 is reliably transmitted to the second connection protrusion 21 via the third and fourth crimp protrusions 22 and 23.

  Furthermore, since the first connection projection 11 facing the second connection projection 21 of the upper plate 20 is formed on the lower plate 10, the flexible circuit board 90 includes the first connection projection 11 and the first connection projection 11. It is fixed by being sandwiched between the two connection projections 21. Since the first and second connection projections 11 and 21 are orthogonal to each other in plan view, even if the position is slightly displaced as described above, for example, between the first and second connection projections 11 and 21. The flexible circuit board 90 can be securely sandwiched.

  At the time of crimping, the upper plate portion 20 pressed by the barrel portions 16 and 17 bends so as to rise at the portion of the second connection projection portion 21, so that the upper plate portion 20 has a portion of the second connection projection portion 21. An elastic force toward the lower plate portion 10 acts. Thereby, the flexible circuit board 90 is strongly fixed between the first and second connection protrusions 11 and 21. For this reason, even if the flexible circuit board 90 is a membrane circuit that is easily bent, it can be firmly fixed.

  Thus, in the crimping fitting 1 according to the first embodiment, between the first and second connection projections 11 and 21, between the first and third crimping projections 12 and 22, and the second and fourth crimping. Since the flexible circuit board 90 is sandwiched and fixed at the three points between the protrusions 13 and 23, the pressure bonding strength is improved.

  Further, in the crimping fitting 1 according to the first embodiment, the first and second connection projections 11 and 21 that are electrical contacts sandwich the flexible circuit board 90 while pressing, so the first and second The structure in which the two connection projections 11 and 21 are in close contact with the flexible circuit board 90 is realized, and the electrical connection reliability between the flexible circuit board 90 and the crimping fitting 1 is improved.

  Furthermore, in the crimping fitting 1 according to the first embodiment, the tip portions 16a and 17a of the barrel portions 16 and 17 are pressed closer to the barrel portions 16 and 17 than the center portion in the short direction of the upper plate portion 20. Therefore, both sides of the upper plate portion 20 sandwiching the center portion are pressed with good balance, and the flexible circuit board 90 can be stably fixed.

  In addition, you may make it the front-end | tip parts 16a and 17a of the barrel parts 16 and 17 press a position far from the barrel parts 16 and 17 rather than the center part of the upper board part 20. FIG. In this way, the bending radii of the barrel portions 16 and 17 can be increased, so that the barrel portions 16 and 17 can be prevented from being folded or broken.

  In the crimping fitting 1 according to the first embodiment, the barrel portion 16 is provided only at a location near the connecting piece 29 of the side portion 14 of the lower plate portion 10, and the barrel portion 17 is connected to the side portion 15 of the lower plate portion 10. Since the barrel portions 16 and 17 are not opposed to each other in the short direction, the distal end portions 16a and 17a of the barrel portions 16 and 17 are surely secured even if the crimping fitting 1 is downsized. The upper plate part 20 can be strongly pressed by being bent into the upper part. Thereby, size reduction can be achieved, suppressing the fall of the crimping | compression-bonding strength with the flexible circuit board 90. FIG.

[Second Embodiment]
FIG. 5 is a perspective view showing a crimping fitting according to the second embodiment of the present invention. FIG. 6 is a perspective view showing a state where the crimping fitting is crimped to the flexible circuit board. 7 is a cross-sectional view taken along the line CC ′ of FIG. The crimping fitting 1A according to the second embodiment is different from the crimping fitting 1 according to the first embodiment in that the barrels 18 and 19 are provided in addition to the barrels 16 and 17, but other than that. The structure of is the same. Therefore, in the following, differences from the crimping fitting 1 according to the first embodiment will be mainly described, and portions already described are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5 to FIG. 7, the barrel portion 16 is located on the side portion 14 of the lower plate portion 10 of the crimping fitting 1 </ b> A according to the second embodiment at a position closer to the connecting piece 29 than the first connection protrusion 11. However, the barrel portions 18 are erected so as to protrude to the upper surface 10 a side at positions farther from the coupling piece 29 than the first connection projection portion 11. Further, the side plate 15 of the lower plate portion 10 has a barrel portion 17 at a position farther from the connecting piece 29 than the first connecting projection 11 and a barrel portion at a position closer to the connecting piece 29 than the first connecting projection 11. 19 are erected so as to protrude to the upper surface 10a side.

  That is, the barrel parts 16 and 19 are opposed to each other in the short direction of the lower plate part 10 with the first crimping projection part 12 interposed therebetween, and the barrel parts 17 and 18 are the lower plate part with the second crimping projection part 13 sandwiched therebetween. 10 are formed so as to face each other in the short direction. Even with such a configuration, the upper plate portion 20 can be pressed by the barrel portions 16 to 19, so that the same operational effects as the crimping fitting 1 according to the first embodiment can be obtained.

[Third Embodiment]
FIG. 8 is a perspective view showing a crimping fitting according to the third embodiment of the present invention. FIG. 9 is a perspective view showing a state where the crimping fitting is crimped to the flexible circuit board. Further, FIG. 10 is a sectional view taken along the line DD ′ of FIG. In the crimping fitting 1B according to the third embodiment, the lower plate portion 10 and the upper plate portion 20 are not connected by the connecting piece 29, and the points made of independent members are the crimping fitting 1B according to the second embodiment. Is different.

  That is, as shown in FIGS. 8 to 10, the barrel portions 16 to 19 are formed on the side portions 14 and 15, and the first connection projection portion 11, the first and second crimping projection portions 12 and 13 are formed. The lower plate portion 10 and the upper plate portion 20 on which the second connection projection portion 21 and the third and fourth crimping projection portions 22 and 23 are formed are formed in rectangular strips that are independent from each other when seen in a plan view. Yes.

  Even with such a configuration, it is possible to achieve the same operational effects as the crimping fittings 1 and 1A according to the first and second embodiments. Further, since the connecting piece 29 is not provided, the crimping fitting 1 can be crimped to an arbitrary location such as the central portion rather than the end side of the flexible circuit board 90.

1, 1A, 1B Crimping bracket 10 Lower plate portion 10a Upper surface 11 First connection projection portion 12 First crimping projection portion 13 Second crimping projection portion 14, 15 Side portion 16-19 Barrel portion 20 Upper plate portion 20a Lower surface 21 Second Connection projection 22 Third crimp projection 23 Fourth crimp projection 29 Connection piece 90 Flexible circuit board 91 Board body 92, 93 Conductor 94 Coverlay 99 Through-hole

Claims (2)

A first plate portion having a first protrusion contacting a first conductor circuit formed on one surface side of the flexible circuit board;
A second plate portion having a second protrusion portion that contacts the second conductor circuit formed on the other surface side of the flexible circuit board and faces the first protrusion portion;
A barrel portion erected on at least one of the pair of side portions in the lateral direction in at least one of the first and second plate portions;
While the flexible circuit board is sandwiched between the first plate part and the second plate part, the barrel part is bent inward to be crimped to the flexible circuit board, and the first and second A crimping fitting, wherein the first and second conductor circuits are made conductive by a plate portion. The crimping fitting according to claim 1, wherein the first and second plate portions are connected to each other in the longitudinal direction by a connecting portion.

Images