JP2539768Y2 - Connection structure of FPC board - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an FPC mounted on an instrument case for wiring, for example, automotive instruments.
The present invention relates to a connection structure of an FPC board for connecting the board to other electric members such as terminals of electric equipment disposed inside a case and terminals routed to the outside via electric cords and the like.

[0002]

2. Description of the Related Art In general, in such an instrument, an instrument for displaying a vehicle operating condition such as a speedometer, a tachometer, a fuel gauge or a thermometer, a hydraulic pressure state for driving a brake, an opening / closing state of a door, etc. are provided in a case. operational state of the hand brake or warning devices of various vehicle conditions such as the upward lighting state of the headlights centrally displayed, are further housed nighttime illumination lamp instruments, these instruments and concentration warning device and a lamp Power is supplied from a vehicle battery via an electric cable. In this case, the electric cable is connected to a printed wiring board on which a predetermined conductive circuit pattern formed on the outer surface of the case is formed,
The printed wiring board is electrically connected to an instrument , a central warning device, and a lamp.

[0003] In recent years, an instrument of this type, as a printed wiring board can be disposed pull turning and only simply bending easy to fit the irregular shape, the synthetic resin film such as polyester that flexible The used FPC (flexible printed wiring) board is attached along the back and side surfaces of the instrument case.

[0004]

[Problem to be solved by the invention] However, for example,
Conductive parts provided on the FPC board are connected to the terminals (other electrical members) of electrical equipment such as instruments and lamps inside the case using screws etc.
A case of electrically connecting, electrical equipment <br/> which is housed in the case arrangement of the electrical connector arrangement such as a space in question, or FPC board conductive circuit pattern formed on account of, FPC
In some cases, a conductive portion must be formed in a partially narrow portion of the plate . At this time, since the FPC board has a relatively thin shape, the narrower the FPC board becomes, the weaker the strength tends to be. When tightening the screw, such a narrow portion is tightened with the screw. There was a problem that the portion was displaced in the rotation direction due to the force, and as a result, the portion was twisted or cracked.

In view of the above, a structure as shown in FIGS. 8 and 9 has been proposed in order to consider the above disadvantages to some extent. In FIG. 8, the FPC board B is arranged in the instrument case A,
A narrow tongue piece C is formed on the FPC board B , a screw hole D is provided at a tip end H of the tongue piece C, and a holding hole E is provided near the screw hole D. FP where holding hole E is located
The C plate B portion is formed relatively wide, and an engaging pin F, which is a positioning protrusion standing from the case A, is fitted into the holding hole E, and conductive screws such as conductive screws are inserted through the screw holes D. There is known a structure in which the tongue piece C is prevented from being rotated by being screwed and fixed by the fixing member G, thereby preventing the tip end portion H from being damaged. Further, in FIG. 9, the tongue piece C of the FPC board B is formed gradually wider from the tip end H side to the base end J side, so that the rotation is suppressed even when the stress applied to the base end J is received. A structure for preventing damage to the FPC board B is known.

However, in any case, since the area of the tongue piece C is required to be relatively large, if the space on the outer surface of the case A is not sufficient, the above structure may not be suitable.

[0007] The present invention is intended to solve the above-mentioned problems, and a relatively narrow tongue portion is formed on an FPC board, and this tongue portion is connected to a terminal of each electric device inside the case or a case. when connecting the other electrical members, such as external pulling fucked terminals from the outside by an electric cord or the like, pushing the FPC board
The area of the tongue piece serving as a protruding part can be kept to a necessary minimum, and by preventing the tongue piece of the FPC board from being swung by screwing, it is possible to prevent damage to this part , While keeping the area of one side to the minimum necessary
It is another object of the present invention to provide an FPC board connection structure capable of preventing damage to the tongue piece .

[0008]

According to the present invention, in order to achieve the above object, an FPC board is provided along an outer surface of a case,
At least a part of this FPC board has a conductive part around.
The first screw hole and the protrusion formed on the outer surface of the case are fitted.
An independently deformable tongue with a first retaining hole
The tongue piece is formed and folded back on the tongue piece.
Each of the first screw hole and the first holding hole
With a second screw hole and a second holding hole that match
The overhang portion is connected to the conductive portion with respect to the tongue piece portion.
The first and the first in a state of being folded back so as not to cover
Both of the second holding holes are fitted into and engaged with the projections.
A conductive screw penetrating both the first and second screw holes
Electrically connected the conductive portion and other electrical members through
And, the conductive part and the electric member are moved relative to the case.
It is constituted by being fixed mechanically .

[0009]

According to the above construction, even if stress is applied to the tongue by screw tightening, it is possible to receive the stress in a multi- layered structure of the tongue and the overhang which is formed by overlapping the tongue. Therefore, kinks and breaks are prevented.

[0010]

EXAMPLES 1 to 3, there Te shows a first embodiment according to the one embodiment of the present invention in a vehicle meter, the meter casing 1, although not shown, as the electrical equipment, for example Instruments, such as a speedometer, a tachometer, a fuel gauge, and a thermometer, for displaying a vehicle operation status are housed and arranged.

On the back side of the case 1, a flexible thin FPC board 2 made of a polyester film or the like is routed and arranged, and an appropriate number of positioning pins are provided at appropriate places on the instrument case 1. The projection 3 is formed, and the projection 3
FPC board holding hole 4 into two parts is formed corresponding to.

Further, the FPC board 2 is provided with an electric cord behind the electric equipment and an external cord (not shown).
A conductive path 5 for electrical connection to a terminal, which is another electrical member shown, or a lamp for illuminating the instrument is formed, and is connected to a vehicle-mounted battery (not shown).

The FPC board 2 has a relatively narrow tongue piece 2a formed on the tip 2d side of the tongue piece 2a.
The conductive portion 7 from which the insulating film 6 has been removed, a screw hole (first screw hole) 8a around which the conductive portion 7 is provided, and a positioning holding hole (first ) located near the screw hole 8a . Retention
Holes 4a are formed respectively. A projecting portion 2b is connected to the periphery of the tongue piece 2a (right side in FIG. 2) so as to be foldable. When the projecting portion 2b is folded back so as to overlap the tongue piece 2a, the tongue piece is formed. Screw holes (second holes ) are provided at positions corresponding to the screw holes 8a and the holding holes 4a of the portion 2a .
Screw holes) 8b and holding holes (second holding holes) 4b. Further in this embodiment, the tongue piece portion 2a and the swollen
Between the parts 2b, that is, the folded portion 2c the distal end 2d side and a proximal end respectively 2e side slit 9 is provided et al
This facilitates bending.

Next, an assembling operation for connecting the FPC board 2 to the electric equipment in the case 1 will be described. First, FP
The C plate 2 is arranged along the outer surface of the case 1. Then, conductive
The folded portion 2c is used as a reference so as not to cover the surface of the electrical portion 7.
Then, by folding back the protruding portion 2b between the tongue piece 2a and the case 1, the tongue piece 2a and the protruding portion 2b are overlapped.
Let In this case, the respective holding holes 4a, so 4b is consistent,
The projection 3a provided on the case 1 both holding holes 4a, simultaneously engaged fit engagement to 4b, position the tongue portion 2a. Finally, in response to this and screw holes 8a formed in the tongue portion 2a Zhang
Since the screw holes 8b formed in the projecting portion 2b coincide with each other, the screw holes 8a and 8b and the through hole 1a provided in the case 1 are provided.
Bis 10 is a fixing member have a conductive penetrating bets,
The conductive part 7 and the terminal 11 are electrically connected via the screw 10 by being screwed around and fixed to a terminal ( another electric member) 11 of the electric device disposed inside the case 1. And conductive
The part 7 and the terminal 11 are mechanically fixed to the case 1 through the screw 10.
Ru is constant.

With the above configuration, the shape of the outer surface of the case 1
Alternatively, due to the formation of a conductive circuit pattern, the FPC board 1
When the conductive part 7 and the terminal 11 are electrically connected with the screw 11
Sometimes these conductive parts 7 and terminals 11 are screwed into case 1
The connection fixing part of the FPC board 1 to be mechanically fixed
Even when formed as a narrow tongue piece 2a , FPC
The tongue piece 2a, which is a connection fixing portion of the plate 1, is provided with an overhang 2b.
Is turned back to form each screw hole 8a, 8b and each holding hole 4
a, 4b, so that it has a strong structure,
Screw the screw 10 and tighten the conductive part 7 of the tongue piece 2a and the terminal 11.
When connecting and fixing the tongue , the tongue piece 2a is
Screw hole 8a in the tongue piece 2a
Ki De preventing kinking occurs or around, the damage of or caused or fully toward the peripheral holding hole 4a to the outside in advance, therefore should be minimal area of the tongue piece portion 2a
While, Ru can prevent damage to the tongue portion 2a. Further, in this embodiment, the overhang portion 2b is formed using an unnecessary portion of the FPC board 2 which escapes from the protrusion of the case 1.
Manufacturing costs can be reduced.

The distance from the tip 2d side of the folded portion 2c to the base end 2e side is appropriately set if it is larger than the distance from the center of the screw hole 8a of the tongue piece 2a to the center of the holding hole 4a. as to well, also based on the shape folded portion 2c of the overhang portion 2b, screw holes 8b and the holding hole 4b of the overhang portion 2b, are relative and the screw hole 8a and the holding hole 4a of the tongue piece 2a If necessary, it may be set appropriately, and the overhang portion 2b
May be provided continuously at any position around the tongue piece 2a as long as it can be superimposed on the tongue piece 2a . For example, in FIG.
It may be provided on the left side of the tongue piece 2a. In this embodiment, the holding hole 4a is also formed by the holding hole 4b of the overhang portion 2b.
It has a heavy structure and has the additional effect of being reinforced.

FIGS. 4 to 6 show a second embodiment of the present invention. The same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the embodiment, a narrow tongue piece 2a of the FPC board 2 and a terminal ( another electrical member) 11a routed from outside via an electrical cord.
FIG.

Further, in this embodiment, also extends the conductive path 5 to the projecting portion 2b which is provided continuously to the tongue portion 2a, the tongue part 2a
Are formed with a screw hole (first screw hole) 8a and two holding holes (first holding holes) 4a and 4c for positioning, and the projecting portion 2b is formed with a screw based on the folded portion 2c. Screw holes so as to be equal in distance to the hole 8a and the holding holes 4a and 4c.
(Second screw hole) 8b and holding hole (second holding hole) 4
b, 4d are formed, and the projecting portion 2b is folded back toward the case 1, and the case 1 is simultaneously formed in the holding holes 4a, 4c and the holding holes 4b, 4d provided in the corresponding projecting portion 2b. The projections 3a, 3b for positioning, which are provided upright, are fitted and engaged, and the through-holes and tongue pieces (not shown) of the terminals 11a are provided.
2a and the screw hole 8b of the overhang 2b.
Screw 10 provided in case 1 not shown in case 1
Is clamped fixed turn the screwing holes More Rukoto, conductive portion 7 and the end
Element 11a is electrically connected to the conductive part 7 and the terminal 11
a are mechanically fixed to the case 1 . Further in this embodiment, the folded portion 2c of the width of the narrower FPC board 2 tongue portions 2a of the overhang portion 2b, tongue part 2a of the distal end portion 2
On the d side and the base end 2e side, slits 9 are formed by partially cutting out the FPC board 2, respectively.
The conductive path 5 of part c is partially removed to form a removed portion 12, thereby improving the folding operation.

[0019] Incidentally, projections 3a for positioning of erected from the case 1, 3b are also performed positioning of the terminal 11 at the time of tightening fixing turn the terminal 11 by a fixing member 10 such as a screw.

Therefore, in this embodiment, when the terminal 11 is attached, substantially the same effect as in the first embodiment can be expected, and by extending the conductive path 5 to the overhang portion 2b. Further, the strength of the tongue piece 2a of the FPC board 2 can be increased.

FIG. 7 shows a third embodiment of the present invention, in which the tip 2 of the narrow tongue 2a of the FPC board 2 is shown.
d has overhangs 2 on both the left and right sides with respect to the longitudinal direction.
b, 2f are provided.

The tongues 2b and 2f have tongues
A conductive path 5 is extended continuously with the portion 2a, and a screw hole (first tongue portion) 8a provided in the narrow tongue portion 2a with reference to the folded portions 2c and 2g, respectively, and holding for positioning. Hole (1st
At the same distance from the holding hole 4a, the projecting portion 2b has a screw hole (second screw hole) 8b and a holding hole (second holding hole ).
Hole 4b and a screw hole (second screw hole) in the overhang portion 2f.
8c and a holding hole (second holding hole) 4c are respectively formed.

In this embodiment, the folded parts 2c,
A perforated portion 13 is formed in 2g by partially cutting the folded portions 2c and 2g, so that the folded portion is good.

Accordingly, the first and second protrusions 2b and 2f provided on the left and right sides of the tongue piece 2a in the above-described configuration are respectively turned around the case side by means of folded screws and fixed, thereby securing the first and second parts. The same effect as that of the second embodiment can be obtained, and the overhang portions 2b and 2f are provided on the left and right of the tongue piece 2a.
Both extended portion 2b, by 2f copper foil portion 7a and extends to the formation, it is possible to reinforce the tongue portion 2a on both sides, also both
Each of the tongue pieces 2a is folded by folding the overhangs 2b and 2f.
Screw holes 8a, 8b, 8c and holding holes 4a, 4b, 4c
Since the triple structure having a, it is possible to further reinforce
You .

The overhangs 2b, 2f may be provided on the tip 2d side of the protrusion 2a in addition to the left and right overhangs 2b, 2f, or the overhang of the protrusion 2a. It may be provided on the 2d side and either one of the left and right sides thereof, and may be provided in an appropriate place as appropriate according to design conditions and the like.

Further, the aforementioned first far described, the second, third embodiment, Ru can der be combined by respective different conditions.

[0027]

[Effects of the Invention] The present invention applies FPC along the outer surface of the case.
A board is provided and at least a part of the FPC board is guided around.
A first screw hole serving as an electrical part and an outer surface of the case;
Independently deformable with a first holding hole into which the bent projection fits
Form a functional tongue, and fold it back
The first screw hole and the first screw hole
A second screw hole and a second holding hole corresponding to each of the holding holes;
An overhang provided with a tongue is connected to the tongue piece.
Folded and polymerized so as not to cover the conductive part
And both the first and second holding holes are fitted into and engaged with the projections.
And penetrate both the first and second screw holes.
The conductive part is electrically connected to another electric member via a conductive screw.
And electrically connecting the conductive portion and the electrical member to the case.
The mechanical fixation of the FPC board
Use a narrow tongue to fix the connection to the electrical member through the screw.
Even if it is formed as a part , the tongue piece part has a multiple structure
To reduce the area of the tongue piece to the minimum necessary.
In addition, the connection structure of the FPC board that can prevent damage to the tongue piece
Structure can be provided .

[Brief description of the drawings]

FIG. 1 is a perspective view of an assembled state of an FPC board showing a first embodiment of the present invention.

FIG. 2 is an exploded view of an essential part of the FPC board.

FIG. 3 is a cross-sectional view of a main part of the above-described assembled state of the FPC board.

FIG. 4 is a perspective view showing a second embodiment of the present invention in an assembled state of an FPC board.

FIG. 5 is an exploded view of a main part of the FPC board.

FIG. 6 is a sectional view of FIG. 5;

FIG. 7 is a development view of a main part of the FPC board, showing a third embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional example in an assembled state of an FPC board.

FIG. 9 is a plan view showing an assembled state of the FPC board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 2 FPC board 2a Tongue piece part 2b, 2f Overhang part 2c Folding part 3, 3a, 3b Projection part 4 Holding hole 4a First holding hole 4b, 4c Second holding hole 5 Conductive path 7 Conductive part 8a 1 screw hole 8b, 8c second screw hole 9 slit 10 screw 11, 11a terminal ( other electrical member)

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 60-42754 (JP, U) JP-A 1-86182 (JP, U) JP-A 61-180480 (JP, U) JP 3 9268 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] An FPC board is provided along an outer surface of a case, and at least a part of the FPC board serves as a conductive part around the FPC board.
First screw hole and a protrusion formed on the outer surface of the case
Independently deformable tongue with a first holding hole into which the tongue fits
Part is formed, and the tongue piece is folded back to form the tongue.
The first screw hole and the first holding hole are superposed on
A second screw hole and a second holding hole corresponding to each were provided.
An overhang is provided in series, and the overhang is guided to the tongue piece.
In the state where it is folded back and polymerized so as not to cover the electrical part,
When both the first and second holding holes are fitted and engaged with the protrusions,
The conductive material penetrates both the first and second screw holes.
The conductive part is electrically connected to another electric member via a screw.
Connecting the conductive part and the electric member to the case.
A connection structure for an FPC board, which is mechanically fixed .