JP2001044668A - Structure for leading out lead w/h section of flexible printed circuit board from unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fracture of a lead circuit section without causing the positional deviation of a switch circuit section, even when a tensile stress is applied to the lead circuit section while the lead circuit section is wired or transported, by integrally constituting the switch circuit section with the lead circuit section. SOLUTION: A structure for leading out lead W/H section of flexible printed circuit body from switch unit is contrived to lead out a lead W/H section 37 connected to the circuit section 36 of a circuit unit, which is constituted by housing the circuit section 36 in a housing case 35 composed of an under case 34 and an upper case 33 from the cut section 41 of the under case 34. The structure is provided with through holes 46 and 47 for bosses 42 and 43 on both sides of the lead W/H section 37 and, in addition, the bosses 42 and 43 which are protruded in L-shapes from two spots under the cut section 41 on the side wall of the under case 34. Therefore, the lead W/H section 37 can be retained by the upper case 33 and under case 34 when the through holes 46 and 47 of the W/H section 37 are put on the bosses 42 and 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead W connected to a flexible printed circuit housed in a case.
The present invention relates to a structure for removing a lead W / H from a unit.

[0002]

2. Description of the Related Art In general, a door trim for a vehicle such as an automobile is provided with a switch unit having a power window switch for opening and closing a window glass, a switch for driving a door mirror, and the like. A plurality of electric devices such as courtesy lamps that are lit at times are mounted. In order to connect these electric devices, a wire harness including many wires and connectors is arranged. The wiring of such a wire harness is performed through a work window provided in a door panel, but this work is often blind,
It is very troublesome. Furthermore, there are many components for electrical connection to each mechanism and each mechanism described above, and assembly and connection work are also difficult.

Therefore, in recent years, a flat circuit body has been used for wiring a wire harness for connecting an electric device (for example, Japanese Patent Application Laid-Open No. 9-309390). A conventional flat circuit body switch holder 1 includes:
It has a configuration as shown in FIG. In the figure, an upper terminal portion 3 of a flexible printed circuit 2 is bent at a right angle and is fixedly fixed to a switch holder 1. The flexible printed circuit 2 is composed of an insulating film 4 made of a synthetic resin and a plurality of parallel printed circuits 5 arranged in the continuous film 4. The upper terminal 3 of the flexible printed circuit 2
In this example, engaging holes 6 are provided at four corners of the insulating film 4 and a plurality of contact portions 7 connected to each printed circuit 5 are provided.

The switch holder 1 is formed of a synthetic resin, and includes a rectangular substrate portion 8 and a frame-shaped lid portion 9 rotatable with respect to the substrate portion 8. The lid 9 is connected to the substrate 8 by, for example, an integrated thin hinge. Further, frame walls 10 are erected on both sides of the board portion 8, and elastic locking arms 12 with respect to the door trim 11 side are provided on the outer wall surface of each frame wall 10.
And a curved elastic piece 13 are protruded from each other.
That is, the elastic locking arms 1 are provided on the front side of each frame wall 10.
2 is provided with an elastic piece 13 on the front end side of each frame wall 10. The elastic locking arm 12 has a locking projection 14 and a locking release operation unit 15. The frame wall 10 is formed with an engagement hole 17 for a lock projection 16 provided on the lid 9.

A positioning pin 19 having a conical inclined guide surface 18 with respect to the locking hole 6 of the flexible printed circuit body 2 is projected from the substrate portion 8. Further, the lid 9 is provided with an opening 20,
The contact portion 7 of the flexible printed circuit 2 and the positioning pin 19 can be located in the opening 20. Note that the inclined guide surface 18 may be continuous from the upper end to the lower end of the positioning pin 19.

The terminal 3 of the flexible printed circuit 2
The positioning hole 36 is engaged with the positioning bin 36 to be positioned and mounted on the substrate portion 8. Next, by closing the lid 9, the lock protrusion 16 is engaged with the engagement hole 17, and the lid 9 is locked with the terminal 3 held therebetween. The positioning pin 19 protrudes into the opening 20. The contact pins 7 are accurately positioned by the positioning pins 19.

[0007] The assembled state of the flat circuit body 21 to the door trim 11 is as shown in FIG. That is, an opening 22 is formed in the door trim 11, and a pair of insertion guides 23 for the flat circuit body 21 with respect to the switch holder 1 are provided in the opening 22 in the thickness direction of the door trim. This insertion guide 23 is formed in an L shape,
It protrudes from the upper wall 24 in the opening 22. The insertion guide 23 has an engagement hole (not shown) for the engagement protrusion 14 of the elastic engagement arm 12 of the switch holder 1. The switch holder 1 is supported by the elastic locking arm 12 and the elastic piece 13 between the pair of insertion guides 22 so as to be movable in the lateral direction.

[0008]

As described above, the flexible printed circuit body 2 does not move when the locking holes 6 provided at the four corners of the insulating film 4 are fitted into the positioning pins 19 and pressed by the lid 9. It is like that.

The flexible printed circuit 2 has a switch circuit printed on a film and is a very thin contact switch. This locking hole 6 is fixed to the positioning pin 19 so as not to move by being fitted thereto, and is further pressed down by the lid 9 so as not to move. When the lead circuit is stretched in the longitudinal direction, it is strong. However, when a force is applied in the direction perpendicular to the longitudinal direction (lateral direction) of the film lead, an excessive force is applied to one end as a tensile stress. Will be added.

Thus, the flexible printed circuit 2
When a tensile stress is applied from the outside, the position of the switch contact may be shifted and the operation switch may not be easily turned on.
Further, when an excessive tensile stress is applied to the flexible printed circuit body 2 from the outside, there is a problem that the switch circuit is disconnected.

An object of the present invention is to form a switch circuit unit and a lead circuit unit integrally, and to arrange the switch circuit unit even if a tensile stress is applied to the lead circuit unit when arranging or carrying the lead circuit unit. The purpose of the present invention is to prevent the occurrence of displacement and the occurrence of breakage in the read circuit portion.

[0012]

In order to achieve the above object, a structure for taking out a lead W / H portion of a flexible printed circuit from a unit according to claim 1 is constituted by an under case and an upper case. A lead W / H portion of a flexible printed circuit body for taking out a lead W / H portion connected to the circuit of a circuit unit having a circuit portion housed in a storage case from a cutout portion of an under case is taken out from the unit. A through hole for a boss is formed on each side of the lead W / H portion, and a lead W / H portion is formed in a notch forming position on the under case side for taking out the lead W / H portion on the side wall on the under case side. Two L-shaped bosses for fixing are installed, and the lead W /
The through hole of the H portion is fitted to the boss, and is pressed by the upper case and the under case. With this configuration, according to the first aspect of the present invention, the switch circuit unit and the lead circuit unit are integrally formed, and a tensile stress is applied to the lead circuit unit when the lead circuit unit is routed or transported. However, it is possible to prevent the switch circuit from being displaced, and to prevent the lead circuit from being broken.

According to a second aspect of the present invention, there is provided a flexible printed circuit body according to the second aspect, wherein the lead W / H portion is taken out of the unit from the through hole of the lead W / H portion by the side wall on the under case side. A part of the lead W / H portion is provided at a position where the portion becomes slack as an extra length portion in the undercase when fitted to the L-shaped boss formed in FIG. According to the second aspect of the present invention, the switch circuit portion and the lead circuit portion are integrally formed, and a tensile stress is applied to the lead circuit portion when the lead circuit portion is routed or transported. However, since the lead W / H portion accommodated as an extra length in the under case absorbs the tensile stress, it is possible to prevent the displacement of the switch circuit portion from occurring, and the lead circuit portion is broken. Can be prevented.

According to a third aspect of the present invention, the lead W / H portion of the flexible printed circuit is taken out of the unit by pulling the lead W / H portion to both ends in the longitudinal direction. This is configured by forming a reinforcing dummy pattern that can withstand stress. With this configuration, according to the invention described in claim 3,
The switch circuit section and the lead circuit section are integrally formed, and even if a tensile stress is applied to the lead circuit section when the lead circuit section is routed or transported, the lead circuit section is formed on both ends in the longitudinal direction of the lead W / H section. In addition to preventing a break or the like from being caused by the reinforcing dummy pattern, even if a tensile stress that cannot be tolerated by the reinforcing dummy pattern is applied, the lead W / H portion stored as an extra length in the under case. Because of the absorption of tensile stress, it is possible to prevent the switch circuit portion from being displaced, and to prevent the lead circuit portion from being broken.

According to a fourth aspect of the present invention, there is provided a structure for taking out the lead W / H portion of the flexible printed circuit from the unit. It is a copper foil formed. According to this configuration, the switch circuit unit and the lead circuit unit are integrally formed, and a tensile stress is applied to the lead circuit unit when the lead circuit unit is routed or transported. By applying a protective film or copper foil around the through-hole, the most force is applied to the through-hole formed in the lead circuit portion, and the displacement of the switch circuit portion due to breakage of this through-hole is caused. In addition to preventing the breakage of the through-hole, even if the through-hole is subjected to a tensile stress that cannot be tolerated by the protective film or the copper foil, the lead W / H portion accommodated as an extra length in the undercase reduces the tensile stress. Due to the absorption, it is possible to prevent the switching circuit unit from being displaced, and to prevent the lead circuit unit from being broken.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a structure for taking out a lead W / H portion of a flexible printed circuit from a unit according to the present invention will be described below. FIG. 1 shows a lead W / H of a flexible printed circuit according to the present invention.
FIG. 2 is a perspective view showing an embodiment in which a take-out structure from a unit is applied to a switch unit of an automobile door, and FIG. 2 is an exploded perspective view of a portion A shown in FIG.

In FIG. 1, reference numeral 30 denotes a door trim. The door trim 30 has an armrest 31 protruding toward the rear surface 32 of the door trim 30. The armrest 31 has a resin upper case. 3
3 is attached. An under case 34 is fitted into the upper case 33, and a storage case 35 is configured by the upper case 33 and the under case 34. A switch circuit section 36 is stored in the storage case 35, and a lead W / H section 37 is connected to the switch circuit section 36. The switch circuit section 36 and the lead W / H section 37 constitute a flexible printed circuit body 38. The flexible printed circuit body 38 is formed by printing a switch circuit on a film-like resin material having flexibility and printing and wiring a lead wire on the switch circuit to form an integrated body (also referred to as FPC). It is. The lead W / H portion 37 of the flexible printed circuit body 38
Is led out of the storage case 35, and a connector 39 is attached to the tip. This connector establishes connection with an external circuit (ECU).

Part A of FIG. 1 has a configuration as shown in FIG. That is, the notch portion 41 for passing the lead W / H portion 37 is formed in the side wall 40 of the under case 34 constituting the storage case 35. The side wall 40 of the under case 34 in which the notch 41 is formed has L
The bosses 42, 4 are formed in the shape of
3 are provided. Also, in the upper case 33,
Arc-shaped notches 44 and 45 are provided so as to be fitted to the arms of the bosses 42 and 43. These notches 44, 45
When the upper case 33 is put on the under case 34, the upper case 33 is fitted to the arm portions of the bosses 42 and 43 provided on the side wall 40 of the under case 34.
Are fitted so as to fit with the under case 34. Also, the notches 44, 4
The inner side 33a of the end of the side wall surface 5 is formed in a curved shape. This is because the upper case 33
This is to prevent the lead W / H portion 37 of the flexible printed circuit body 38 from being damaged by the inner end of the upper case 33 when it is put on the upper case 4.

On the other hand, through holes 46 and 47, which are holes through which the bosses 42 and 43 are fitted, are formed in the lead W / H portion 37 of the flexible printed circuit body 38. The formation position of the through holes 46 and 47 is determined by the lead W / H
The lead 37 is formed at a location where it does not interfere with the printed wiring, that is, at both ends of the lead W / H section 37 in the longitudinal direction. In addition, around the through holes 46 and 47, when the lead W / H portion 37 is pulled or stress is applied to the through holes 46 and 47, the through holes 46 and 47 are not easily damaged. , Protective films 48 and 49 made of resin are attached. These protective films 48 and 49 can be provided instead of the copper foil.

Therefore, the switch circuit section 36 and the lead W / H section 37 are integrally formed, and when the lead W / H section 37 is subjected to tensile stress when the lead W / H section 37 is routed or transported, Through holes 46 and 4 formed in lead W / H portion 37
The protective film (or copper foil) 48, 49 is provided around the through holes 46, 47 to prevent the switch circuit portion 36 from being displaced due to the greatest force applied to the through holes 7 and the breakage of the through holes 46, 47. As a result, the through holes 46 and 47
Can be prevented, and the displacement of the switch circuit portion 36 can be prevented from occurring, and the breakage of the lead W / H portion 37 can be prevented.

The reinforcing dummy patterns 50 and 51 are provided on both ends in the longitudinal direction of the lead W / H portion 37 of the flexible printed circuit body 38 over the entire length of the lead W / H portion 37 of the flexible printed circuit body 38. Are formed. The reinforcing dummy patterns 50 and 51
/ H portion 37 is formed simultaneously with the pattern for forming the lead wire. The reinforcing dummy patterns 50 and 51 are used for reinforcement for preventing the lead W / H portion 37 from being damaged when the lead W / H portion 37 receives a tensile stress such as being pulled for some reason. It is provided. Therefore, the switch circuit unit 36 and the lead W / H unit 37 are integrally configured,
When the lead W / H section 37 is routed or transported, the lead W / H
Even if a tensile stress is applied to the portion 37, the reinforcing dummy pattern 5 formed on both ends in the longitudinal direction of the lead W / H portion 37 is formed.
It is possible to prevent breaks and the like from occurring due to 0 and 51, prevent the switch circuit unit 36 from being displaced, and prevent the lead W / H unit 37 from breaking.

As shown in FIG. 3, the lead W / H portion 37 of the flexible printed circuit body 38 having the above-described structure first has a portion near the cutout portion 41 of the under case 34 formed by the lead W / H portion 37a. The lead W / H portion 37 is then lifted to the position shown in FIG.
The through hole 4 of the lead W / H portion 37 is located at the position of the
Bosses 42 and 43 are fitted to 6 and 47, respectively. Further, as shown by the arrow B, the lead W / H section 37 is
At position c, the lead W / H part 37 is pushed into the bosses 42 and 43 into the through holes 46 and 47, and the lead W / H
The boss 4 is inserted into the through holes 46 and 47 of the lead W / H part 37 at the position of the lead W / H part 37d as shown by the arrow C.
Push down to the end of 2,43. When the lead W / H section 37 is pushed into the through holes 46 and 47 of the lead W / H section 37 to the position of the lead W / H section 37d to the depth of the bosses 42 and 43, the lead W / H section 37 is stored in the storage case. A surplus portion 37e is formed in 35.

Thereafter, the upper case 33 is put on the under case 34 in the direction shown by the arrow D. When the upper case 33 is put on the under case 34 in this way, as shown in FIG. 4, the lead W / H portion 37 of the flexible printed circuit body 38 is formed by the through holes 46 and 47 fitted into the bosses 42 and 43. The extra length portion 37e is formed in the storage case 35, and the switch circuit portion 36 and the lead W /
The H portion 37 is integrally formed, and even if a tensile stress is applied to the lead W / H portion 37 when the lead W / H portion 37 is routed or transported, the lead W / H portion 37 is stored as an extra length portion 37e in the under case 34. Since the lead W / H portion 37 absorbs tensile stress, it is possible to prevent the switch circuit portion 36 from being displaced, and to prevent the lead W / H portion 37 from being broken.

The structure for taking out the lead W / H portion of the flexible printed circuit from the circuit unit according to the present invention is not limited to the case where it is applied to a switch unit of a door for an automobile as in the above-described embodiment, but may be applied to an automobile. A variety of electrical equipment units mounted on each part of the above, from the circuit part of the circuit unit that houses the circuit part (terminal circuit part of the flexible printed circuit body) in the storage case constituted by the under case and the upper case The present invention can be applied to any structure in which the extending lead W / H portion of the flexible printed circuit is taken out of the storage case.

[0025]

According to the first aspect of the present invention, the switch circuit portion and the lead circuit portion are integrally formed, and a tensile stress is applied to the lead circuit portion when the lead circuit portion is routed or transported. Also, it is possible to prevent the switching circuit unit from being displaced, and to prevent the lead circuit unit from being broken.

According to the second aspect of the present invention, the switch circuit section and the lead circuit section are integrally formed, and even if a tensile stress is applied to the lead circuit section when the lead circuit section is routed or transported, Lead W stored as extra length in undercase
Since the / H portion absorbs the tensile stress, it is possible to prevent the switch circuit portion from being displaced, and to prevent the lead circuit portion from being broken.

According to the third aspect of the present invention, the switch circuit portion and the lead circuit portion are integrally formed, and even if a tensile stress is applied to the lead circuit portion when the lead circuit portion is routed or transported, The reinforcement dummy pattern formed at both ends in the longitudinal direction of the lead W / H portion prevents breakage and the like, and prevents the reinforcement dummy pattern from being subjected to an unacceptable tensile stress. Since the lead W / H portion accommodated as an extra length in the case absorbs the tensile stress, it is possible to prevent the switch circuit portion from being displaced and prevent the lead circuit portion from being broken. be able to.

According to the fourth aspect of the present invention, the switch circuit section and the lead circuit section are integrally formed, and when a tensile stress is applied to the lead circuit section when the lead circuit section is routed or transported, the lead circuit section is connected to the lead circuit section. The most force is applied to the through-hole formed in the circuit portion, and the displacement of the switch circuit portion due to the breakage of the through-hole is prevented by providing a protective film or a copper foil around the through-hole. And the lead W / H portion accommodated in the undercase as an extra length absorbs the tensile stress even if the through-hole is subjected to a tensile stress that cannot be withstood by the protective film or the copper foil. In addition, it is possible to prevent the switch circuit from being displaced, and to prevent the lead circuit from being broken.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a structure in which a lead W / H portion of a flexible printed circuit body according to the present invention is taken out of a switch unit and applied to a switch unit of an automobile door.

FIG. 2 is an exploded perspective view of a portion A shown in FIG.

FIG. 3 is an operation explanatory diagram showing a procedure for inserting and inserting a lead W / H portion of the flexible printed circuit shown in FIG. 1;

FIG. 4 is a diagram showing a state where leads W / H of a flexible printed circuit are inserted based on the operation shown in FIG. 3;

FIG. 5 is an exploded perspective view showing a state in which a conventional flexible printed circuit is assembled to a switch holder.

FIG. 6 is an exploded perspective view showing a state where the flexible printed circuit shown in FIG. 5 is mounted on a door trim.

[Explanation of symbols]

30 ... door trim 31 ... armrest part 33 ... upper case 34 ... upper case 34 ... …………………………………………… Under storage case 35 ……………… Storage case 36 ……………………………… Switch circuit part 37 …………………… Lead W / H Part 38 ...... Flexible printed circuit body 40 ... Side wall 41 ... Notch parts 42, 43 ... Boss 44, 45… Notch 46, 47… Through-hole 48, 49… Protective film 50, 51 ............ Dummy pattern for reinforcement

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kentaro Shiraki 1500 Onjuku 1500, Susono-shi, Shizuoka Yazaki Sogyo Co., Ltd. F-term (reference) 5E348 AA02 AA29 AA30 AA31

Claims (4)

[Claims] 1. A flexible printed circuit in which a lead W / H portion connected to a circuit unit of a circuit unit having a circuit unit housed in a storage case constituted by an undercase and an upper case is taken out from a cutout of the undercase. This is a structure for taking out the lead W / H portion of the body from the unit. The through hole for the boss is formed on each side of the lead W / H portion, and the lead W / H portion is taken out on the side wall on the under case side. Two L-shaped bosses for fixing the lead W / H portion are provided at the notch forming positions on the undercase side of the lead W.
A structure for taking out the lead W / H portion of the flexible printed circuit from the unit, wherein the through hole of the / H portion is fitted to the boss and held by the upper case and the under case. 2. The through-hole of the lead W / H portion, when fitted to an L-shaped boss formed on the side wall on the under case side, causes a part of the lead W / H portion to be inside the under case. 2. The lead W of a flexible printed circuit according to claim 1, wherein the lead W is provided at a position where slack occurs as a surplus portion.
/ Structure for taking out the H unit. 3. The lead of a flexible printed circuit according to claim 1, wherein the lead W / H portion has a reinforcing dummy pattern withstanding a tensile stress formed at both ends in the longitudinal direction. Structure for taking out the W / H unit from the unit. 4. The lead W / H part of a flexible printed circuit according to claim 1, wherein the lead W / H part is formed by forming a protective film or a copper foil around the through hole. Take-out structure from the unit.