JPH0569990U - Flexible printed wiring board mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a mounting structure of a flexible printed wiring board, which can short-circuit a circuit at low cost without using a separate component. [Structure] One conductor layer 11a of the flexible printed wiring board 10 is formed on a tongue-shaped portion 14 having a tongue shape, and the tongue-shaped portion 14 is oriented to the other conductor layer (electrical connection portion) 22. It has a three-dimensional bent portion 14 and at least its front end and locking holes formed at both ends of the bent portion 14, and the instrument case 20 has a storage recess 21 and a plurality of fixing boss portions. The bent portion 15 of the tongue 14 is housed in the housing recess 21 of the instrument case 20, and the locking hole of the tongue 14 is press-fitted into the fixing boss portion of the instrument case 20. The conductive portion 11a 'on the tongue-shaped portion 14 side and the conductive portion 22 on the other side are connected so that the conductor surfaces are in the same direction, and are fixed by screws 25.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a mounting structure for a flexible printed wiring board, and more particularly to a mounting structure for a flexible printed wiring board that can short-circuit a circuit at low cost without using a separate component. ..

[0002]

[Prior Art]

 In recent years, automobile instruments and the like are becoming more and more complicated, and it is common to use flexible printed wiring boards for electrical wiring to these instruments.

A flexible printed wiring board generally has a printed circuit made of a conductive material such as a copper foil formed on a flexible base member such as a film, and an insulating coating layer formed on the surface of the printed circuit. However, if, for example, the conductor layers as printed circuits or the conductor layers and the electrical connection to the internal unit are separated due to the presence of other conductor layers in the middle, 5 and the short-circuiting means as shown in FIG. 6 were taken.

That is, in FIG. 5, the flexible printed wiring board 2 attached to the instrument case 1 has conductor layers 3 a, 3 b, 3 c, 3 d, where the conductors shielded by the conductor layers 3 b, 3 c. When the layer 3a and the electric connection portion 4 to the internal unit are electrically connected, another conductor layer 3e is fixed to the electric connection portion 4 with a screw 5, and the base portion of the conductor layer 3e and the conductor layer 3e are fixed. The base of 3a was connected to the base of 3a by soldering the jumper wire 6 to achieve a short circuit.

Further, in FIG. 6, similarly, the conductor layer 3a shielded by the conductor layers 3b and 3c and the electric connection portion 4 to the internal machine are connected by a lead wire 7 and fixed by screws 5a, 5b. Due to this, a short circuit was attempted. It has been known that a similar short circuit is performed by using two pieces of a flexible printed wiring board, which are stacked, instead of the lead wire 7.

However, in the above-described conventional structure for mounting a flexible printed wiring board, it is necessary to use separate parts such as jumper wires, lead wires and cut pieces of the flexible printed wiring board, which leads to an increase in cost. There was a problem of being caught.

As described in, for example, Japanese Utility Model Laid-Open No. 57-59476, one conductor layer of a flexible printed wiring board is formed in a tongue shape, and this tongue-like portion is folded back so that the other conductor layer or an electrical layer is formed. A short-circuit means consisting of overlapping the connecting part and fixing the overlapping part with a screw is also known, but this method is used, and the conductive part of one conductor layer folded back and the other conductor layer or electrical connection part If the other side is an electrical connection to the internal machine, it will not be possible to achieve direct conduction by screwing, and a further conductor will be added to the electrical connection to the internal machine. It was necessary to form a layer and superimpose the tongue-like portion of one conductor layer on this conductor layer for electrical conduction, which eventually required two screws and a further conductor layer, and could not reduce the cost.

[0008]

[Problems to be solved by the device]

 The present invention has been achieved as a result of investigations for solving the problems of the conventional flexible printed wiring board mounting structure described above.

Therefore, an object of the present invention is to provide a mounting structure for a flexible printed wiring board that can short-circuit a circuit at low cost without using a separate component.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, a mounting structure for a flexible printed wiring board according to the present invention is a flexible printed circuit having two conductor layers to be electrically connected to each other or a circuit in which a conductor layer and an electric connection portion are arranged apart from each other. In a flexible printed wiring board mounting structure in which a wiring board is attached to an instrument case, one conductor layer of the flexible printed wiring board to be conducted is formed as a tongue-shaped tongue-shaped portion, and this tongue-shaped portion is The three-dimensional bent portion for directing to the other conductor layer or the electrical connection portion, and at least the front end thereof and locking holes formed at both ends of the bent portion, and the instrument case is It has a storage recess and a plurality of fixing bosses, and stores the bent portion of the tongue in the storage recess of the instrument case, and the locking hole of the tongue is fixed to the instrument case. While press-fitting into the boss portion, connect the conductive part on the side of the one conductor layer and the conductive part of the other conductor layer or the electrical connection part so that the conductor surfaces are in the same direction, and fix with screws. It is characterized by having done.

[0011]

[Action]

 The mounting structure of the flexible printed wiring board according to the present invention is such that one conductor layer of the flexible printed wiring board is a tongue-shaped portion, and a bent portion and a locking hole are formed in this tongue-shaped portion and stored in the instrument case. A recess and a fixing boss are formed, the bent portion of the tongue is housed in the housing recess of the instrument case, and the locking hole of the tongue is press-fitted into the fixing boss of the instrument case. At the same time, the conductive part of the tongue and the conductive part of the other conductor layer or the electrical connection part are connected so that the conductor surfaces are in the same direction, and are fixed by screws. One conductor layer can be directly connected to the other conductor layer or the electrical connection portion without using a separate component such as, and the cost can be reduced.

Further, since one conductor layer of the flexible printed wiring board can be connected to the other conductor layer or the electric connection portion with the conductor surfaces in the same direction, the other conduction portion is electrically connected to the internal unit. Also in the case of a portion, it is possible to directly conduct electricity from one conductor layer to the other electrical connection portion via a fixing screw.

Therefore, according to the flexible printed wiring board mounting structure of the present invention, the cost can be reduced, and the flexibility and function of the design of the flexible printed wiring board can be greatly improved.

[0014]

【Example】

 Hereinafter, an embodiment of a mounting structure for a flexible printed wiring board according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective explanatory view of a main part of a flexible printed wiring board used in the present invention, FIG. 2 is a perspective explanatory view showing a state in which a tongue in FIG. 1 is bent to form a bent portion, and FIG. FIG. 4 is a perspective explanatory view of a main part of an instrument case used in the present invention, and FIG. 4 is a perspective explanatory view showing one embodiment of a flexible printed wiring board mounting structure of the present invention.

First, the structure of the flexible printed wiring board and the instrument case used in the present invention will be described, and then the flexible printed wiring board mounting structure of the present invention in which the flexible printed wiring board is attached to the instrument case. I will explain.

In FIG. 1, a flexible printed wiring board 10 used in the present invention has conductor layers 11a, 11b, 11c and 11d, where conductor layers 11b and 11c shield the conductor layer 11a. The main purpose is to easily connect the screw holes 12 forming the electrical connection to the internal machine by fastening the screws.

The one conductor layer 11a is formed on the tongue-shaped portion 14 cut out by the notch groove 13, and the tongue-shaped portion 14 is connected to the conductor layer 11a located on the tip side thereof. In order to orient the portion 11a 'toward the screw hole 12 which is the formation portion of the other conductor layer, the three-dimensional bent portion 15 as shown in FIG. 2 is formed, and at least the portion 11a' is formed. Locking holes 16a, 16b and 16c are provided at the front end and both ends of the bent portion 15. In addition, 16d and 16e in FIG. 1 are locking holes for inserting the fixing boss portions 23a and 23b formed on the instrument case 20 side.

Here, as shown in FIG. 2, the bent portion 15 is formed by three bends of the mountain bent portions 15a and 15c and the valley bent portion 15b, whereby the tongue portion 14 itself is formed. The direction is changed so that the conducting portion 11a 'at the tip end portion is aligned with the position of the screw hole 12.

The bent portion 15 of the tongue-shaped portion 14 is formed by utilizing the flexibility of the flexible wiring board 10 itself, and as shown in FIG. Notches 17a, 17b, and 17c for bending guides are preferably formed in the portions where the bent portions 15a and 15c and the valley bent portion 15b are formed, so that the bent portion 15 can be formed more easily. You can

Further, it is desirable that a reinforcing copper foil layer 18 is provided on both sides of the tongue-shaped portion 14 where the bent portion 15 is formed, whereby the bent portion 15 is reinforced and the circuit breakage occurs. Can be prevented.

On the other hand, as shown in FIG. 3, on the instrument case 20 side, a plurality of recesses 21 and a plurality of locking holes 16a, 16b, 16c, 16d, 16e on the flexible printed wiring board 10 side are respectively provided. The fixing boss portions 23a, 23b, and 23c are formed, and the storage recess 21 has a size and a depth to accommodate the bent portion 15 of the tongue-shaped portion 14.

Further, it is desirable that a rib portion 24 is formed on the side edge of the storage recess 21, and the rib portion 24 protects the bent portion 15 stored in the storage recess 21 to store the rib. It is possible to prevent the protrusion and the protrusion from the recess 21.

In FIG. 3, reference numeral 22 denotes a screw hole corresponding to the screw hole 12 on the side of the flexible printed wiring board 10 and forming an electric connection portion (conduction portion) to the internal machine.

Next, the structure of the mounting structure of the flexible printed wiring board according to the present invention will be described with reference to FIG.

Referring to FIG. 4, the flexible printed wiring board mounting structure of the present invention stores the bent portion 15 of the tongue portion 14 in the housing recess 21 of the instrument case 20 and locks the tongue portion 14. The holes 16a, 16b, 16c, 16d, 16e are press-fitted into the fixing boss portions 23a, 23b, 23c of the instrument case 20, and the conducting portion (11a ') on the tongue portion 14 side and the instrument case 20 side. The conducting portions (22) are connected so that their conductor surfaces are in the same direction, and are fixed by screws 25.

In assembling the mounting structure of the flexible printed wiring board of the present invention having such a structure, first, the locking holes 16d and 16e on the flexible printed wiring board 10 side are fixed to the fixing boss portion 23a on the instrument case 20 side, Positioning press fit into 23b.

Next, a bent portion 15 is formed in the tongue-shaped portion 14 on the flexible printed wiring board 10 side along the cutouts 17a, 17b, 17c, and the bent portion 15 is stored on the instrument case 20 side. 21, and the locking holes 16a, 16b, 16c on the flexible printed wiring board 10 side are press-fitted into the fixing boss portions 23a, 23b, 23c on the instrument case side, respectively.

Then, the leading end conduction portion 11 a ′ of the conductor layer 11 a on the flexible printed wiring board 10 side and the screw hole 22 as a conduction portion on the instrument case 20 side are connected so that the conductor surfaces are in the same direction, By tightening the screw 25, one conductor layer 11a is directly conducted to the other electric connection portion 22 without using a separate part such as a jumper wire or a lead wire, and the short circuit is applied to the flexible printed wiring. The plate mounting structure is completed.

In the above-mentioned embodiment, the other conducting portion to be conducted is described as the electrical connecting portion 22 to the internal unit arranged in the instrument case, but the flexible printed wiring of the present invention is used. Needless to say, the board mounting structure can be applied to a short circuit between the conductor layers of the flexible printed wiring board.

[0031]

[Effect of the device]

 As described above, in the flexible printed wiring board mounting structure of the present invention, one conductor layer of the flexible printed wiring board is formed as a tongue portion, and the tongue portion is formed with the bending portion and the locking hole. At the same time, a storage recess and a fixing boss are formed in the instrument case, the bent part of the tongue is stored in the storage recess of the instrument case, and the locking hole of the tongue is fixed to the instrument case. By press-fitting into the boss portion, the conducting portion of the tongue portion and the conducting portion of the other conductor layer or electrical connection portion are connected so that the conductor surfaces are in the same direction, and are fixed by screws. Therefore, it is possible to directly conduct one conductor layer to the other conductor layer or the electrical connection portion without using a separate component such as a jumper wire or a lead wire, and it is possible to reduce the cost.

Further, since one conductor layer of the flexible printed wiring board can be connected to the other conductor layer or the electric connection portion with the conductor surfaces in the same direction, the other conduction portion is electrically connected to the internal unit. Also in the case of a portion, it is possible to directly conduct electricity from one conductor layer to the other electrical connection portion via a fixing screw.

Therefore, according to the flexible printed wiring board mounting structure of the present invention, the cost can be reduced and the flexibility and function of the design of the flexible printed wiring board can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a flexible printed wiring board used in the present invention.

FIG. 2 is a perspective explanatory view showing a state in which the tongue portion in FIG. 1 is bent to form a bent portion.

FIG. 3 is an explanatory perspective view of a main part of an instrument case used in the present invention.

FIG. 4 is a perspective view showing an embodiment of a mounting structure for a flexible printed wiring board according to the present invention.

FIG. 5 is a perspective explanatory view showing an example of a conventional flexible printed wiring board mounting structure.

FIG. 6 is a perspective explanatory view showing another example of a conventional mounting structure for a flexible printed wiring board.

[Explanation of symbols]

 10 Flexible Printed Wiring Board 11a to 11d Conductor Layer 12 Screw Hole 13 Notch Groove 14 Tongue-like Part 15 Bent Part 16a to 16e Locking Hole 17a to 17c Cutout 18 Copper Foil Layer 20 Instrument Case 21 Storage Recess 22 Threaded Hole Portion) 23a to 23c fixing boss portion 24 rib portion 25 screw

Claims (5)

[Scope of utility model registration request] 1. A mounting structure of a flexible printed wiring board, wherein a flexible printed wiring board having two conductor layers to be electrically connected to each other or a circuit in which a conductor layer and an electric connection portion are arranged apart from each other is attached to an instrument case. , One conductor layer of the flexible printed wiring board to be conducted is formed in a tongue-like portion having a tongue shape, and the tongue-like portion has a three-dimensional shape for directing to the other conductor layer or the electrical connection portion. A bent portion and at least its front end and locking holes formed at both ends of the bent portion, and the instrument case has a storage recess and a plurality of fixing bosses, and The bent portion of the tongue is housed in the housing recess, the locking hole of the tongue is press-fitted into the fixing boss of the instrument case, and the conducting portion on the one conductor layer side and the other one Conductor layer Or with the conducting part of the electrical connection,
A mounting structure for a flexible printed wiring board, characterized in that the conductor surfaces are connected in the same direction and are fixed by screws. 2. The mounting structure for a flexible printed wiring board according to claim 1, wherein a notch portion for a bending guide is provided in a bent portion forming portion of the tongue portion of the flexible printed wiring board. 3. The flexible printed wiring board according to claim 1 or 2, wherein copper foil layers for reinforcement are provided on both sides of a bent portion forming portion of the tongue-shaped portion of the flexible printed wiring board. Mounting structure. 4. The mounting structure for a flexible printed wiring board according to claim 1, 2 or 3, wherein a rib portion is provided on a side edge of the storage recess of the instrument case. 5. The one electrical connection portion to be electrically connected to one conductor layer is an electrical connection portion to an internal unit arranged in the instrument case. Flexible printed wiring board mounting structure described in.