JP4889027B2 - Connection structure between flexible board and terminal bracket - Google Patents

Description

  The present invention relates to a connection structure between a flexible board such as a membrane or a flexible circuit board (FPC) and a terminal fitting.

  As this type of conventional connection structure, a barrel is erected on a lower plate of a terminal fitting having an upper plate and a lower plate, and a hole into which the barrel of the lower plate is inserted is formed in a circuit board, Reinforcement plates with similar holes are provided on the circuit board at these holes, and the upper plate is lifted and a barrel formed on the lower plate is inserted into the holes of the circuit board, and then the upper plate is returned to the lower and upper plates. It is known that the upper plate is fixed by bending the barrel with the substrate sandwiched between the plate and the printed surface of the circuit board and the lower plate are in contact (see Patent Document 1). According to this conventional example, workability can be improved, damage to the circuit surface can be prevented, and connection reliability can be improved.

  As another conventional example, a terminal is provided at one end in the longitudinal direction of the base, and an FPC is placed on the installation surface of the base, and extends from both sides substantially orthogonal to the longitudinal direction of the base. There is known a technique in which an FPC is pressure-bonded and fixed between an outer peripheral surface of a bent beam portion formed in a cylindrical shape on an inner side provided to face an installation surface and the installation surface (see Patent Document 2). As a result, the outer peripheral surface of the bent beam portion comes into surface contact with the FPC, and stress concentration on the FPC is alleviated, so that damage to the FPC can be prevented. Further, even if the wall thickness is reduced due to stress relaxation of the FPC due to secular change, an elastic force can be applied to the FPC from the bent beam portion, so that the FPC can be stably connected over time. Since the bent beam portion has a small spring constant, a decrease in elastic pressing force accompanying a decrease in the thickness of the FPC can be reduced.

As another conventional example, a pair of metal plates that sandwich the membrane circuit, two coupling members that fixedly couple the pair of metal plates with the membrane circuit interposed therebetween, and at least one of the pair of metal plates There has been known one provided with at least one convex portion which is located in the middle of two coupling members and is formed so as to project toward the membrane circuit (see Patent Document 3).
JP 2006-172751 A (2nd page, FIG. 1) Japanese Patent No. 3271952 (2nd page, FIG. 1) Japanese Patent Laid-Open No. 2001-52769 (second page, FIG. 1)

  In the thing of patent document 1, since it is a structure which provides a convex part only in the upper board or lower board of a terminal, and contacts the circuit and terminal of a flexible substrate, the surface and circuit surface in which the convex part of a terminal is not provided Therefore, it is necessary to change the direction of the terminal in accordance with the circuit surface of the flexible substrate.

  In the case of the structure described in Patent Document 2, in which a convex portion is provided at the upper part and a double-sided connection is provided by providing a hole at the lower part, there is a disadvantage in that it is difficult to balance the contact force because the contact shapes are different from each other. It was. If the balance is not well achieved, different behaviors may occur during environmental tests.

  In the thing of patent document 3, since the circuit surface of the convex part of a terminal and a flexible substrate is made to correspond and it contacts, it was a workability | workability bad. In addition, the structure of this conventional example is difficult to be multipolarized.

  Therefore, the present invention can reliably contact and conduct the circuit board and the terminal regardless of whether the circuit surface of the flexible board is upper or lower (double-sided connection of the flexible board is possible), and keeps the conventional terminal shape (crimping) Can be connected on both sides, making it easy to balance the contact force between the top and bottom, improving connection reliability, and improving the workability because terminal crimping can be done without worrying about the circuit surface of the flexible board. It is an object of the present invention to provide a connection structure between a flexible board and a terminal fitting, which can greatly reduce man-hours.

In order to achieve the above-described object, the present invention forms a barrel upright on a lower plate of a terminal fitting having an upper plate and a lower plate, and forms a hole in the flexible substrate into which the barrel of the lower plate is inserted. in the connection structure between the flexible board and the terminal fitting for clamping a flexible substrate with upper and lower plate by bending the inserted barrel into the hole, a protrusion formed in the upper and lower plate, the upper A protrusion formed long in the length direction of the plate or the lower plate and a protrusion formed long in the width direction of the lower plate or the upper plate are opposed to each other so as to overlap each other, and these protrusions A flexible substrate is sandwiched between them.

  According to the present invention, a barrel is erected and formed in a lower plate of a terminal fitting having an upper plate and a lower plate, and a hole into which the barrel of the lower plate is inserted is formed in the flexible substrate, and is inserted into the hole. In the connection structure between the flexible board and the terminal fitting, the bent board is bent and the flexible board is sandwiched between the upper board and the lower board, and a projection is formed on the upper board and the lower board, and the flexible board is formed between the projections. Therefore, even if the circuit surface of the flexible board is either up or down, the circuit board and the terminal can be reliably contacted and conducted (double-sided connection of the flexible board is possible), and the conventional terminal shape (crimped) Double-sided connection is possible by changing only the part. In addition, it is easy to balance the upper and lower contact forces, and the connection reliability is improved. Furthermore, since the terminal crimping operation can be performed without worrying about the circuit surface of the flexible substrate, the workability is improved and the man-hours are greatly reduced.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 to 3 show a terminal fitting 1, and in the overall perspective view of FIG. 1, an upper plate 3 and a lower plate 4 which are coupled from a cylindrical portion 2 into which a male terminal or electric wire is inserted and fixed extend in parallel. The lower plate 4 is formed with the barrel 5 upright, and the projections 6 and 7 are formed on the inner surfaces of the upper plate 3 and the lower plate 4 facing each other. In the illustrated example, two barrels 5 are formed, and two protrusions 7 of the lower plate 4 are formed and one protrusion 6 of the upper plate 3 is positioned between the two protrusions 7. It is. In addition, in order to impart spring properties to the upper plate 3 where the protrusion 6 is formed, recesses 8 are formed on both sides of the protrusion 6. Further, FIG. 3 shows an AA line cut end surface of the terminal fitting 1 from which the barrel 5 of FIG. 2 is omitted. In FIG. 3, the protruding portion 6 slightly protrudes from the lower surface of the two recessed portions 8 of the upper plate 3. It can be seen that this is formed.

  FIG. 4 shows a state in which a flexible substrate 10 such as an FPC is connected to the terminal fitting 1. The barrel 5 formed on the lower plate 4 is inserted into the hole 11 formed in the flexible substrate 10, and these barrels 5 are moved inward. The upper plate 3 is pulled toward the lower plate 4 so as to bend and hold the upper plate 3.

  FIG. 5 is a cut end surface taken along line B-B in FIG. 4. The flexible substrate 10 is sandwiched between the upper plate 3 and the lower plate 4, the flexible substrate 10 is deformed into a wave shape by the protrusions 6 and 7, and the depression is formed. When the bottom of the portion 8 is strongly pressed against the flexible substrate 10, the spring property of the protrusion 3 of the upper plate 3 acts due to the difference in height as shown in FIG. Due to the bending as shown in FIG. 5, the pressing force of the protrusions 6 on the flexible substrate 10 is increased, and the clamping can be ensured.

  The embodiment shown in FIG. 6 shows an example in which a flexible reinforcing plate 12 (especially effective for FPC) is provided with a hard reinforcing plate 12, and connection with the terminal fitting 1 is attempted at the reinforcing plate 12. In a place where the two projecting portions 7 formed on the lower plate 4 of the reinforcing plate 12 contact each other, a hole through which the projecting portion 7 is inserted is formed.

  The three protrusions 6 and 7 formed on the upper and lower plates 3 and 4 have the protrusion 6 positioned at the center of the two protrusions 7 and have a “W shape” in the cross-sectional shape of FIG. With such a W-type connection structure, the flexible substrate 10 (including the membrane circuit) can be reliably brought into contact with the terminal metal fitting 1 regardless of whether the circuit surface thereof is up or down.

The embodiment shown in FIG. 7 to FIG. 11 shows a structure in which the flexible substrate 10 can be clamped more strongly and the connection is strengthened. That is, the interval between the two protrusions 7 formed on the lower plate 4 is wider than that of the previous embodiment, and the lower plate 4 is located in the middle of the protrusions 7 and faces the protrusion 6 of the upper plate 3. A central projection 70 that is long in the longitudinal direction is formed. The other protrusions 6 and 7 are long along the width direction of the upper and lower plates 3 and 4, and the protrusion 6 and the central protrusion 70 overlap each other in a cross shape. Further, the protruding portion 7 faces the hollow portion 8 and overlaps with each other in a cross shape. In other words, the upper plate 3 is formed with two protrusions that are long in the length direction (the lower surface of the recessed portion 8 that protrudes toward the surface facing the lower plate 3), and in the width direction between these two protrusions. A long projecting portion 6 is formed along the bottom plate 4, and two long projecting portions 7 are formed along the width direction on the lower plate 4. A projection (center projection 70) is formed, and three projections on the upper plate 3 (the lower surface of the two depressions 8 and one projection 6) and three projections on the lower plate 4 (two projections 7). And one central protrusion 70) are opposed to each other so as to overlap each other, and a flexible substrate is sandwiched between these protrusions.
As shown in FIGS. 10 and 11, each of the three protrusions formed on the upper plate 3 and the lower plate 4 has one protrusion 6, 6 located at the center, and the other protrusions 8, 70. It is formed so as to protrude from 70.

The perspective view of a terminal metal fitting. The perspective view of the terminal metal fitting which abbreviate | omitted the barrel. The AA cut | disconnection end elevation of FIG. The perspective view of a connection state. The BB line | wire cut end elevation of FIG. The perspective view seen from the back side showing other embodiments. The perspective view of the terminal metal fitting which shows another embodiment. The perspective view of the terminal metal fitting which abbreviate | omitted the barrel of FIG. The perspective view of a connection state. The CC sectional view taken on the line of FIG. FIG. 10 is an end view taken along the line D-D in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal metal fitting 3 Upper board 4 Lower board 5 Barrel 6, 7 Protrusion part 10 Flexible board 11 Hole

Claims (3)

Form the barrel upright on the lower plate of the terminal fitting with the upper and lower plates, form a hole in the flexible board to insert the barrel of this lower plate, and fold the barrel inserted in this hole In the connection structure of the flexible board and the terminal fitting that sandwich the flexible board between the upper plate and the lower plate,
Protruding portions are formed on the upper plate and the lower plate,
The protrusions formed long in the length direction of the upper plate or the lower plate and the protrusions formed long along the width direction of the lower plate or the upper plate are opposed to each other so as to overlap each other in a cross shape. A connection structure between a flexible board and a terminal fitting, wherein the flexible board is sandwiched between protrusions. On the upper plate, two protrusions that are long in the length direction are formed, and one protrusion that is long along the width direction is formed between the two protrusions,
On the lower plate, two long protrusions along the width direction are formed, and one long protrusion in the length direction is formed between the two protrusions,
The three protrusions of the upper plate and the three protrusions of the lower plate are opposed to each other so as to overlap each other, and a flexible substrate is sandwiched between the protrusions. Connection structure of flexible substrate and terminal fittings. 3. The flexible board and the terminal fitting according to claim 2 , wherein each of the three protrusions formed on the upper and lower plates has one protrusion located at the center protruding from the other protrusions. Connection structure.

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