JP2929163B2 - Extendable flexible lead wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring various vibrations of a turbine blade using electric wiring, for example, a strain gauge, between various sensors outputting a small current and a measuring device. The present invention relates to an extendable flexible lead wire suitable for use as an electrical wiring connecting devices and an electrical wiring in a model test of a low elastic body such as rubber or plastic.

[0002]

2. Description of the Related Art For example, when analyzing a vibration phenomenon accompanying rotation of a turbine blade or a compressor blade during high-speed rotation, a required number of strain gauges are first attached to an appropriate portion of the surface of the turbine blade, and the turbine blade is rotated. Slip rings and telemeters are installed near the base axis of the unit. Electrical wiring (connection) is made between each strain gauge and the slip ring or telemeter with an appropriate lead wire, and the output from each strain gauge is output by the contact type or non-contact type. A method is used in which the vibration is transmitted to an externally installed strain measuring device via a signal transmitting means of a formula, and a vibration phenomenon is analyzed based on the measurement result.

In this case, as a lead wire connecting between each strain gauge and a slip ring or the like, a heat-resistant MI cable (Minerl Insulated Cable) is conventionally used because the turbine blade is exposed to high temperatures. I have. Then, this MI cable is formed by forming a thin metal strip having an Ω-shaped cross section so as not to be separated and scattered from the blade by centrifugal acceleration during rotation, and the strip is put on the MI cable, and flanges on both sides are formed. The parts were fixed by spot welding.

A commercially available insulated wire is used as a lead wire for guiding output signals of various sensors for detecting various physical or mechanical quantities and converting them into electrical quantities to the measuring instrument side.

[0005]

However, when the MI cable is used as a sensor lead wire, the following problems occur.

[0006] First, since the MI cable is a metal-coated wire and hard, it is not easy to bend it and attach it along the turbine plate. Second, the MI cable is formed using a metal strip. Spot welding must be performed on many points to fix it, which takes a lot of man-hours,

Third, since the MI cable has a high rigidity, if the MI cable is fixed to a turbine plate, which is an object to be measured, the rigidity of the turbine blade increases, and the vibration phenomenon of the turbine plate differs from the original one. Fourth, since the mass of the MI cable cannot be neglected, the mutual balance of a plurality of turbine blades is lost, causing the occurrence of abnormal vibration. Problems such as the necessity of centrifugal resistance are required.

On the other hand, when a commercially available flexible lead wire is used as an insulated wire, it is difficult to wire the flexible lead wire along a bent wiring path extending from the turbine blade surface to the rotation axis. There arises a problem that the adhesion between the lead wire and the surface of the turbine blade or the like does not go smoothly, and the flexible lead wire is partially lifted.

When such a problem occurs, the flexible lead wire causes a flapping phenomenon due to the airflow during high-speed rotation of the turbine blade, the flexible lead wire vibrates, and noise is mixed into the measured value. This results in another problem. Therefore, in order to prevent the occurrence of such flapping phenomenon, a flexible lead wire having a shape and a length adapted to the shape of the current wiring path is manufactured, and the flexible lead wire is appropriately attached to the turbine blade surface. However, when such a solution is adopted, a problem in terms of cost arises that the cost is increased.

That is, the shape and length of the wiring path of the turbine blade, which is the object of analysis of the vibration phenomenon, vary depending on factors such as the type of turbine blade, the number of blades, the size, the shape, the weight, and the rotational speed range. This is because the flexible lead wire that is adapted to the shape and length of these wiring paths is specially manufactured each time, which greatly increases the cost burden.
Since various problems caused by such differences in the shape and length of the electric wiring route do not exist only in the case of the turbine blade, but also occur in the case of other electric wirings, their effective The emergence of a new solution was desired.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wiring path having a desired wiring path of any shape and length.
It is an object of the present invention to provide a flexible lead wire which is sufficiently adaptable to and can cope with this, can be extended, can perform the connection operation very easily, and can realize a reduction in cost of the entire wiring system.

[0012]

In order to achieve the above object, an extendable flexible lead according to the first aspect of the present invention has an insulating thin plate attached to one surface and one end region on the other surface. A male structure joint portion having a male structure terminal portion of a built-in conductive member, and a female structure terminal portion of the built-in conductive member which can be connected to the male structure terminal portion by soldering in the other end region. A flat flexible circuit board having a female structural joint portion, and a lower solder layer formed at each connection point on the male structural terminal portion and the female structural terminal portion, When the flexible circuit boards are connected in tandem along a desired wiring path between two points, a female structural joint of another flexible circuit board is superimposed on a male structural joint of one flexible circuit board. ,and Between the terminal portions, which are equipped to the joint portion of the both superimposed and is characterized in that configured to be connected soldered with the lower solder layer.

According to a second aspect of the present invention, there is provided an extendable flexible lead having a male structure joint having a male structure terminal in one end region and a female structure terminal having a female structure terminal in the other end region. A flat plate provided with a joint portion and provided as a linear flexible circuit board having a predetermined length, and further having a lower solder layer formed at each connection point on the male structure terminal portion and the female structure terminal portion A first type flexible circuit board, a male structural joint having a male structural terminal in one end region, a female structural joint having the female structural terminal in the other end region, and the one end region A flexible circuit board of a predetermined length provided with a column direction changing portion for turning a column direction in a predetermined direction in an intermediate region between the male structure terminal and the male structure terminal. A flat type second flexible circuit board having a lower solder layer formed at each connection point on the upper and female structure terminal portions, and the wiring having a desired shape and length between two target points When forming a route, a desired flexible circuit board is selected from the first type flexible circuit board and the second type flexible circuit board, and they are formed into a shape adapted to the shape and length of the wiring route. And arranged in tandem with the length,
The female structural joints of the adjacent flexible circuit board are superimposed on the male structural joints of one of the adjacent flexible circuit boards, and the terminal portions provided in the two superposed joints are overlapped with each other. Are formed so as to be able to form the wiring path by soldering the space between them using the lower solder layer.

The flat flexible circuit board in the extendable flexible lead wire according to the third aspect of the present invention includes both an attached thin insulating plate facing the wiring path and an unattached thin insulating plate. Three-layer structure in which at least one flat built-in conductive member provided between the insulating thin plates and having the male structure terminal portion and the female structure terminal portion formed at both ends thereof is in close contact with each other. And a male circuit side having a shape capable of exposing a surface of the non-attached side of the male structure terminal portion to a part of the non-attached side insulating thin plate where the male structure terminal portion is located. And a female structure having a shape capable of exposing both attached and non-attached surfaces of the female structure terminal to a part of both insulating thin plates where the female structure terminal is located. Side connection opening It is characterized in that it has been configured to have.

In the fourth aspect of the present invention, the built-in conductive members of the flexible circuit board in the extendable flexible lead may include a plurality of built-in conductive members arranged in parallel at desired intervals. It is a feature.

[0016]

The extendable flexible lead wire constructed as described above comprises a linear first-type flexible circuit board having a predetermined length, and a column direction changing portion capable of turning the column direction to a predetermined direction. A required number of the provided second type flexible circuit boards are prepared.

And 2 having a desired shape and length.
When configuring a wiring path between points (between two electric elements or devices), the first type flexible circuit board and / or the second type flexible circuit board are adapted to conform to a desired wiring path shape and length. Are arranged in tandem.

In this case, the female structural joint of the adjacent flexible circuit board to be connected to the male structural joint of one of the flexible circuit boards adjacent to each other is arranged so as to overlap with each other. I do. At this time, the female structure terminal of the female structure joint is positioned facing the male structure terminal of the male structure joint.

Thereafter, the lower solder layer formed on the female structure terminal portion is heated by applying a soldering iron to the female structure terminal portion to melt the lower solder layer on the female structure terminal portion side. The two terminals are electrically and mechanically connected by utilizing the solder and the molten solder generated also on the lower solder layer on the male structure terminal side.

At this time, the molten solder on the female structure terminal portion flows from both sides of the female structure terminal portion onto the male structure terminal portion,
The electrical and mechanical connection action is more reliably and stronger, and as a result, the desired wiring path between the two points is
The quick and reliable cascade connection of a plurality of flexible circuit boards is extremely easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of an extendable flexible lead according to the present invention will be described below based on a first embodiment shown in the drawings. FIG. 1 is a plan external view showing the structure of a first-type flexible circuit board in which an intermediate region is formed in a straight line, and FIGS. It is sectional drawing of the arrow B direction and the CC line arrow direction.

In FIGS. 1 to 4, reference numeral 1 denotes a first-type flexible circuit board (hereinafter, simply referred to as a "first-type circuit board") which is formed entirely on a straight line. Made of conductive polyimide resin material, eg thickness
Flexible lower insulating thin plate 1 about 0.02mm
a and the upper insulating thin plate 1b, and both insulating thin plates 1a, 1
b, and two flat conductive foil members (built-in conductive members) 51 and 52 made of a flexible conductive foil material having a thickness of, for example, about 0.035 mm are closely bonded to each other. It is configured as a flexible circuit board having a three-layer structure.

Furthermore, the first type circuit board 1 includes one end region 2 having a male structural joint 60 described later, another end region 3 having a female structural joint 70 described later, and one end region 2. It is also configured as a flexible circuit board having an elongated shape as a whole, comprising an intermediate region 4 formed linearly between the end region 3 and the end region 3. In this case, the first
The total length of the seed circuit board 1 is set to, for example, 300 mm to 400 mm, and the entire width is set to, for example, about 4.2 mm. These dimensions are arbitrarily determined at the design stage.

On the other hand, the two conductive foil members 51 and 52 have a predetermined width (for example, at one end (upper end in FIG. 1)).
0.8 mm) of male structure terminal portions 51a and 52a, and the other end (lower end portion in FIG. 1) has a width (for example, smaller than the width of male structure terminal portions 51a and 52a, for example).
(0.5 mm) female structure terminal portions 51b and 52b, and between each male structure terminal portion 51a and 52a and each female structure terminal portion 51b and 52b, for example, male structure terminal portions 51a and 52a. It is configured as a conductive foil member having intermediate conductive portions 51c and 52c having substantially the same width (for example, 0.85 mm).

In this case, the male structure terminal portion 51a of one conductive foil member 51 and the male structure terminal portion 5a of the other conductive foil member 52
2a is separated by an inner space of, for example, 0.8 mm,
Further, the female structure terminal portion 51b of one conductive foil member 51 and the female structure terminal portion 52b of the other conductive foil member 52 are, for example,
It is set so that it is separated by an inner space of 1.0 mm.

Therefore, as shown in FIG. 10, for example, when the respective female structure terminal portions 51b, 52b are superimposed on the respective male structure terminal portions 51a, 52a, the respective female structure terminal portions 51b, 52b are Each male structure terminal portion 51a, 52
a can face each other with a margin on the left and right sides.

Each of these two male terminal portions 51
A "lower solder layer" is formed on an exposed surface of each of the a and 52a and the female structure terminal portions 51b and 52b by an appropriate method in advance so that soldering connection can be easily performed. In this case, as the solder, for example, 290 to 300 ° C
Is preferably used.

The one end area 2 of the first type circuit board 1 is formed as a male joint 60 having male structural terminals 51a, 52a of the conductive foil members 51, 52. In this case, the outer peripheral edge 61 of the male structural joint 60 in three directions is provided.
a to 61c denote a lower insulating thin plate 1a and an upper insulating thin plate 1a.
b are both formed in a shape corresponding to, for example, three sides of a rectangle, and the length in the longitudinal direction is set to, for example, 8 mm, and the length (width) in the short direction is set to, for example, 4.2 mm. Have been. Then, outer peripheral edges 61a to 61 in these three directions are provided.
c, the alignment shape portion on one end region 2 side (hereinafter, 61
a to 61c are substituted).

Further, in the illustrated embodiment, a rectangular male structure side of 5 mm × 3 mm is placed in the central region of the upper insulating thin plate 1 b separated from the outer peripheral edge (upper edge) 61 a of the male structural joint 60 by, for example, 2 mm. Is formed so as to form the connection opening 62. That is, the connection opening 62 is formed only in the upper insulating thin plate 1b, and the opening is not formed in the lower insulating thin plate 1a.

As a result, only the upper surfaces of the male structure terminal portions 51a and 52a of the two conductive foil members 51 and 52 are exposed in the connection openings 62 on the male structure side. On the other hand, the other end region 3 of the first type circuit board 1 has a conductive foil member 51,
It is formed as a female structural joint 70 having 52 female structural terminals 51b, 52b.

In this case, the outer peripheral edges 71a to 71c of the female structural joint 70 in three directions are formed in a shape corresponding to, for example, three sides of a rectangle together with the lower insulating thin plate 1a and the upper insulating thin plate 1b. , Its length in the longitudinal direction,
For example, the length (width) is set to 8 mm and the length (width) in the short direction is set to 4 mm, for example.

Then, the outer peripheral edges 71a to 71 in these three directions are provided.
c, the alignment shape portion (hereinafter, referred to as 71) on the other end region 3 side.
a to 71c are substituted), but the width dimension of the alignment shape portions 71a to 71c is
The width may be set to the same value as the width dimension (for example, 4.2 mm) of the alignment shape portions 61a to 61c on the one end region 2 side.

Further, in the illustrated embodiment, the lower insulating thin plate 1
a and the upper insulating thin plate 1b are formed in a central region, for example, at a distance of 2 mm from the outer peripheral lower edge 71a of the female structure joint portion 70, in a rectangular shape (5 mm in length and 5 mm in width A connection opening 72 on the female structure side of 3 mm) is formed. As a result, 2
Female terminal portions 51b, 52 of the conductive foil members 51, 52
b, each of the upper and lower surfaces has a connection opening 72 on the female structure side.
Will be exposed inside.

The connection opening 62 on the male structure side and the connection opening 72 on the female structure side are formed by an appropriate method. For example, as one of the methods, the lower insulating thin plate 1a and the upper insulating thin plate 1b which are not yet formed in the three-layer structure, or the lower insulating thin plate 1a and the upper insulating thin plate already formed in the three-layer structure are used. An etching solution is applied to necessary portions of the thin plate 1b, and each opening is formed using an etching method known per se.

In order to connect (join) a plurality of first type circuit boards 1 in series, one first type circuit board 1
When the other end region 3 of the other first type circuit board 1 is superimposed on the one end region 2 of the first type, the alignment shape portions 61a to 61c of the male structural joint portion 60 of one circuit board 1 as shown in FIG.
And the alignment shape portions 71a to 71c of the female structure joint portion 70 of another circuit board 1 substantially coincide with each other with a slight margin in the width direction, and the male structure of one circuit board 1 The connection opening 62 on the male structure side of the joint portion 60 and the female structure joint portion 7 of another circuit board 1
0 and the connection opening 72 on the female structure side completely coincide with each other.

At this time, as described above, the female structural joints of another circuit board 1 are placed on the male structural terminals 51a, 52a formed on the male structural joint 60 of one first type circuit board 1. 70, a female structure terminal portion 51b formed on
52b will be located opposite each other with a slight gap.

Accordingly, for example, the female structure terminal portions 51b, 52
The relative positions of the two structural terminal portions 51b, 52b and 51a, 52a are set in advance so that b can face the male structural terminal portions 51a, 52a with some margin on the left and right sides. If placed, the female structure terminal portions 51b, 52b of another type 1 circuit board 1 can be opposed to the male structure terminal portions 51a, 52a of one type 1 circuit board 1 with a margin. Become. Therefore, in the illustrated embodiment, the width of the male structure terminal portions 51a, 52a is
It is configured to be larger than the width of b.

The gap between each of the male structure terminal portions 51a, 52a and each of the female structure terminal portions 51b, 52b formed when the two first type circuit boards 1 are overlapped with each other, Since it is determined by the relationship between the thickness of each of the lower insulating thin plate 1a and the upper insulating thin plate 1b of the circuit board 1 and the thickness of each of the conductive foil members 51 and 52, each of the insulating thin plates 1
a, 1b, maintaining the electrical insulation and the conductive foil member 51,
In consideration of the flexibility, strength, and the like of the F.52, the value is set to be as small as possible.

When the two first type circuit boards 1 are connected in tandem, both structural terminal portions 51b, 52b and 5
This is to make it possible to reliably and easily electrically connect 1a and 52a by soldering connection work.

FIG. 5 is a plan view showing the structure of a left-bend type second flexible circuit board in which the intermediate region is bent leftward by an angle α. In FIG. 5, reference numeral 11 denotes a left-bend type second-type flexible circuit board (hereinafter simply referred to as "left-bend type second-type circuit board") configured to have substantially the same three-layer structure as the first-type circuit board 1. The one end region 12 having the above-described male structure joint portion 60, the other end region 13 having the above-described female structure joint portion 70, and an intermediate portion between the one end region 12 and the other end region 13. It is configured as a flexible circuit board comprising a left bent middle region 14 formed to be bent leftward by an α angle (for example, 120 degrees). In other words, only the shape of the left bent intermediate region 14 is configured as a flexible circuit board different from the first type circuit board 1. In this case, the length from the outer bending point 15 on the left bending middle area 14 to the upper edge 61a of the one end area 12 and the length from the outer bending point 15 to the lower edge 71a of the other end area 13 are the same length, respectively. (For example, 20 mm), but they may be set to have different lengths.

On the other hand, the two conductive foil members 53 and 54 used for the left-bend type second type circuit board 11 are all the same as the first type circuit board except that the intermediate conductive portion is bent. The conductive foil members 51 and 52 have the same structure. That is, the male structure terminal portions 51a, 5a of the conductive foil members 51, 52
Male structure terminal portions 53a, 54 having the same structure as 2a
a, and the female terminal portions 51b, 5b of the conductive foil members 51, 52
2b Female structure terminal portions 53b, 54b having the same structure
And left bent middle conductive portions 53c and 54c bent leftward
And a conductive foil member having the following.

FIG. 6 is a plan view showing the configuration of a right-bend type second-type flexible circuit board in which the intermediate region is bent rightward by an angle β. In FIG. 6, reference numeral 21 denotes a right-bend type 2nd flexible circuit board (hereinafter, simply referred to as "right-bend type 2nd circuit board") in which the intermediate region is bent rightward by the angle β. The right-bend type second circuit board 21 has the same structure as the left-bend type second circuit board 11 except for the difference in the bending direction in the intermediate region.

That is, the one end region 22 having the male structural joint portion 60, the other end region 23 having the female structural joint portion 70, and the outer bending point 25 are bent rightward by a β angle (for example, 120 degrees). And a right bending middle region 24 formed as described above. The two conductive foil members 55 and 56 used for the right-bend type second circuit board 21 are also the same as the left-bend type second circuit described above except for the difference in the bending direction of the intermediate conductive portion. It has the same structure as the two conductive foil members 53 and 54 of the plate 11.

That is, male structure terminal portions 55a and 56a having the same structure as male structure terminal portions 53a and 54a of conductive foil members 53 and 54, and female structure terminal portions 53b and 54b of conductive foil members 53 and 54, respectively. It is configured as a conductive foil member having female structure terminal portions 55b and 56b having the same structure and right-bent intermediate conductive portions 55c and 56c bent rightward.

The male joint 60 and the female joint 70 in the one end region 12 and the other end region 13 of the left-bend type second circuit board 11 and the right-bend second
Male structural joint 60 and female structural joint 70 in one end region 22 and the other end region 23 of seed circuit board 21.
Are left as they are, and the left bent middle region 14 and the right bent middle region 24 are changed into appropriate curved (for example, arc-shaped) middle regions to form a left curved type and a right curved type. The second type circuit board can also be configured.

Accordingly, when the type of wiring path to be formed requires a curved type 2nd type circuit board, the left curved type and right curved type 2nd type circuit boards are appropriately manufactured and prepared. Will be. In any case, the left-curve type and right-curve type second-type circuit boards and the left-bend type second-type circuit boards 11
The right-bend type second-type circuit board 21 is used as a circuit board for changing the direction of the columns.

FIG. 7 is a plan external view showing a schematic configuration of a connection target flexible circuit board as a connection target for connecting a flexible lead wire according to the present invention having a specific function portion in the other end region. It is. In FIG. 7, 31
Is a flexible circuit board to be connected having a specific function section in the other end area (hereinafter, abbreviated as “circuit board to be connected”).

The circuit board 31 to be connected is provided at one end region 32 with the male structure terminal portion 51 of the first type circuit board 1 described above.
a, 52a or a one-side joint portion (60 or 70) having a male structure terminal portion or a female structure terminal portion (both not shown) having the same structure as the female structure terminal portions 51b, 52b. And a specific function section 40 having a specific electric circuit (not shown) such as a gauge pattern section of a strain gauge, for example, and a straight or curved shape or a predetermined angle between one end region 32 and the other end region 33. It is configured as a flexible circuit board having an intermediate region 34 formed in a shape bent in a predetermined direction.

The length of the circuit board 31 to be connected is
It is set arbitrarily in the design stage. In this case, one ends of two conductive foil members (not shown) used for the circuit board 31 to be connected are naturally formed as the above-mentioned male structure terminal portion or female structure terminal portion. .

Then, the specific electric circuit or electric element is
For example, in the case of a strain gauge, it is formed in a structure as shown in FIGS. FIG. 8 is a plan view showing a configuration of a specific function unit including a gauge pattern unit of a strain gauge, which is one of specific electric circuits or electric elements, and FIG. 9 is a plan view of FIG. FIG. 4 is a partially enlarged plan view showing a detailed structure of a gauge pattern portion of the strain gauge.

[0051] Figure 8, 9, 41 gauge main body of the strain gauge formed on the identification unit 40 of the connection target circuit board 31 (the other end region 33), for example, Si O ₂ materials other end region 33 Is formed by sputtering on the surface of the lower insulating thin plate 1a.
Reference numerals 42 and 43 denote the 2 built in the circuit board 31 to be connected.
Of the strain gauge electrically connected to the conductive foil member
The introduction terminal portion of the book is formed by attaching a conductive foil of, for example, a Ni—Cr alloy material onto the gauge body portion 41 by appropriate means.

Reference numerals 44 and 45 denote two introduction terminal portions 42,
Two gauge tabs of a strain gauge electrically connected to 43, and a conductive material of a material different from that of the introduction terminal portions 42, 43 and easily soldered, for example, a CuNi alloy material is appropriately placed on the gauge tabs 44, 45. Affix by means or gauge tab 4
It is configured to be formed by forming a film by sputtering on 4, 45.

Reference numeral 46 denotes a gauge pattern portion of a strain gauge having a shape and structure as shown in FIG. 9, for example. A conductive foil of the same Ni-Cr alloy material as the gauge tabs 44, 45 is connected and integrated with the gauge tabs 44, 45. In this state, it is formed by attaching it to the gauge main body 41 with appropriate means.

47a to 47c are gauge pattern portions 46.
Three alignment marks formed in the peripheral region of the gauge body portion 41, for example, in a state where a conductive foil of the same Ni-Cr alloy material as the gauge tabs 44 and 45 is connected to and integrated with the gauge pattern portion 46. It is configured to be formed by attaching by means. In this case, each mark 47
They are attached with a relational arrangement such that directions indicated by a to 47c are orthogonal to each other.

Next, a total of three types of circuit boards 1, 11, 2 including a left curved type 2 type circuit board and a right curved type 2 type circuit board
The operation (method) of forming desired wiring paths having various shapes and lengths using FIG. 1 will be described.

[When Only Wiring Routes Are Configured] In this case, the circuit boards 1, 11, and 21 excluding the circuit board 31 to be connected
Are used in a required number, thereby forming a wiring path having a desired shape and length. (A) When forming a linear wiring path having a required length, a required number of first type circuit boards 1 are prepared to obtain a desired length of the linear wiring path.

Then, as shown in FIG. 10, another end area 3 of another circuit board 1 is superimposed on one end area 2 of the first circuit board 1 arranged adjacent to each other. In this case, the positioning outer peripheral portions 71a to 71c on the other end region 3 side of another circuit board 1
Is aligned with the outer peripheral edge 61 of the first circuit board 1 on the one end area 2 side.
When the overlapping operation is performed so as to conform to a to 61c, the overlapping operation is facilitated. At this time, the connection opening 62 on the male structure side of the first circuit board 1 almost completely coincides with the connection opening 72 on the female structure side of another circuit board 1.

When the two first type circuit boards 1 are overlapped in this manner, the male structure terminal portions 51a and 52a formed in the one end area 2 of the first circuit board 1 and the other circuit board 1 The female structure terminal portions 51b and 52b formed in the end region 3
They will face each other with a slight gap.

Accordingly, a soldering iron is applied to each of the female structure terminal portions 51b and 52b from the direction of the connection opening 72 on the female structure side, so that each of the male structure terminal portions 51a and 52a and the female structure terminal portions 51b and 52b. For example, a high-temperature "lower solder layer" of, for example, 290 to 300 ° C., which is formed on the exposed surface of each of the above, is melted, and the respective female structure terminal portions 51b facing each other are formed by using the molten solder. A solder connection is made to the terminal 51a.

At this time, the molten solder generated from the female structure terminal portion 51b and the male structure terminal portion 51a is supplied to both terminals within the gap between each of the female structure terminal portions 51b and 52b and each of the male structure terminal portions 51a and 52a. The parts are connected both electrically and mechanically, but at the same time, the molten solder flowing along both side surfaces of each female structure terminal part 51b, 52b is conveyed by each male structure terminal part 51a,
The connection between the two terminal portions is more reliably and firmly reached to the exposed surface 52a.

Needless to say, soldering connection between both terminal portions may be performed by additionally using separately prepared solder. As a result, the two first type circuit boards 1 are reliably joined together electrically and mechanically. Therefore, such operations are performed a required number of times, and a plurality of the first type circuit boards 1 are connected in tandem to form a linear flexible lead having a desired length.

(B) When forming a bent or curved wiring path having a large curvature, a left-bend type second-type circuit board having a shape and number necessary to obtain a desired bent or curved path 11 or a right-bend type second type circuit board 21 or a left-curve type and right-curve type second type circuit board is prepared.

Then, as in the case of the splicing (coupling) operation between the first type circuit boards 1, one second type circuit board 11
The other end area 13 of the other second type circuit board 11 is overlapped on the one end area 12 of
The male structure terminal portions 51a and 52a formed on the other end of the second type circuit board 11 and the female structure terminal portions 51b and 52b formed on the other end region 13 of the second type circuit board 11 face each other with a slight gap therebetween. To do. Thereafter, as in the case of the coupling operation between the first type circuit boards 1, each of the male structure terminal portions 51a, 5
2a and the female structure terminal portions 51b and 52b are connected by soldering to electrically and mechanically couple the two second type circuit boards 11 to each other, thereby forming a plurality of second type circuit boards. 11,
21 are cascaded to the desired shape and length.

(C) When forming a gentle (small curvature) bent or curved wiring path, and when forming a wiring path having a desired shape and length,
The required number of the first type circuit boards 1 for forming the wiring path
And the required number and shape of second type circuit boards 11 and 21 are prepared.

When forming a gentle bent or curved wiring path, the first type circuit board 1 is interposed between a certain second type circuit board 11 and another second type circuit board 11. The circuit boards 1 and 11 are arranged in such an order as to cause the second type circuit boards 11 to be electrically and mechanically connected to each other by soldering the joints of the circuit boards 1 and 11. I do.

On the other hand, when forming a wiring path having a desired shape and length, the first type circuit board 1 is arranged on a linear partial path of the wiring path, and the wiring path has a bent or curved shape. The second type circuit boards 11 and 21 having a shape adapted to the bent state or the curved state of the portion are arranged on the partial path, and then the respective joint portions are soldered and connected to the first type circuit board 1 and the second type circuit board. The seed circuit boards 11 and 21 are electrically and mechanically coupled to each other, whereby the plurality of first type circuit boards 1 and the second type circuit boards 11 and 21 are connected in tandem.

The joining operation and the soldering connection operation at this time are the same as those of the first type circuit board 1 and the second type circuit boards 11 and 21 described above, and therefore the description thereof is omitted. The flexible lead wires connected in cascade in this manner are attached to the object to be measured using, for example, a cold-setting epoxy adhesive. Alternatively, an adhesive may be applied to the lower insulating substrate 1a side, and a release paper may be attached thereon, so that the release paper is peeled off and adhered to the object to be measured when wiring is actually performed. Good.

[Case of Connecting to Circuit Board 31 Having Specific Function Section 40] In this case, the circuit board 31 having the specific function section 40 desired in the other end area 33 is described above ( Each of the wiring paths having various configurations formed by the items (a) to (c) is joined to a terminal portion thereof.

Then, the female structural joint 70 of the one-side joint of the circuit board 31 to be connected is superimposed on the male structural joint 60 of the first or second type circuit board 11 disposed at the end of the wiring path. First or second type on the male joint part 60 of the joint or one-side joint part
The female structure joint 70 of the seed circuit board 11 is superimposed on the introduction terminal portions 42 and 43 as the male structure joint 60.

Thereafter, in accordance with the procedure described in the above-mentioned items (a) to (c), the one-side joint (60 or 7) is used.
0) and the male or female joints 60, 70 of the first or second type circuit board 11 are electrically and mechanically connected. Then, it is only necessary to attach the specific function part 40 of the circuit board 31 to be connected formed as a strain gauge to, for example, a set measurement point on the surface of the turbine blade using bonding or other appropriate means. Is made more efficient.

The length and width of the first type circuit board 1, the length and width of the second type circuit boards 11 and 21, the bending angle in the left-right direction, the curvature of the curve, and the like are determined as necessary. Alternatively, it may be appropriately set at the design stage according to the demand, and the specific function unit 40 of the connection target circuit board 31
It is assumed that the specific electric circuit formed as described above is appropriately set as needed or as required.

Further, the first type circuit board 1 and the second type circuit boards 11, 2 which require a length and a width for which many demands are expected.
The first type circuit boards 11 and 21 having a bending angle and a curvature of a curve, for which a large demand is expected, can be manufactured and stocked in advance.

Although the illustrated embodiment has been described above, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention. For example, in the embodiment described above, the various circuit boards 1, 1
Although two conductive foil members are incorporated in the first and the second 21, the number of the conductive foil members to be incorporated can be one or three.
It may be more than books.

The electric insulating material used for the lower insulating thin plate 1a and the upper insulating thin plate 1b may be a material other than the polyimide resin, and the material of the conductive foil member may have an appropriate conductive property. Any material having flexibility and required mechanical strength may be used. Further, the alignment peripheral portion 6 formed on the various circuit boards 1, 11 and 21.
The shapes and structures of 1a to 61c and 71a to 71c and the shapes and structures of the connection openings 62 and 72 on the male structure side and the female structure side can be arbitrarily determined at the design stage.

As shown in FIG. 7, the flexible circuit board to be connected is not provided with the intermediate region 34, and the gauge tabs 44 and 45 of the gauge body 41 and the introduction terminal portions 42 and 43 are formed as shown in FIG. Integrally formed, and the introduction terminal portion 42,
43 may be configured similarly to the male structure terminal portions 51a, 52a. The connection target flexible circuit board is not limited to the case where a strain gauge is formed, but may be formed with a temperature sensor, a humidity sensor, or the like.

The object to be connected is not limited to a flexible circuit board, but may be various physical-electrical amount converters or various mechanical-electrical amount converters such as an acceleration converter, a pressure converter, a displacement converter, and a torque converter. (Hereinafter simply referred to as a “converter”). In this case, the lead wires derived from the converter are connected to the male structure terminal sections 51a, 52a or 53a, 54a, 54a, 5a of the first type flexible circuit board 1 or the second type flexible circuit boards 11, 21.
The soldering is performed directly on 5a and 56a.

The object to be connected is not limited to a strain gauge or a transducer, but may be a measuring instrument or a general cable. The connection method is also the same as that of the above-described transducer. It will be soldered directly to any of 54a-56a.

[0078]

As described above, when the present invention is used, even if the desired wiring path has any shape, for example, a wiring path having a curved surface and a length, the desired wiring path has a shape required for the wiring path. By connecting the required number of flexible flexible circuit boards in cascade, it is possible to provide an extendable flexible lead wire that can be sufficiently adapted and corresponded thereto. Therefore, since it is not necessary to manufacture a flexible lead wire having a shape and a length suitable for each application,
It is excellent in versatility and also has the effect of reducing the cost of the entire wiring system.

In the case of cascade connection, of the group of flexible circuit boards arranged to form the cascade, the other female structure terminal adjacent to the male structure terminal portion of one of the flexible circuit boards adjacent to each other is used. By overlapping the parts, the lower solder layer formed on the female structure terminal portion is heated by applying a soldering iron to the upper female structure terminal portion, thereby melting the lower solder layer on the female structure terminal portion side, Utilizing the molten solder at this time and the molten solder generated also in the lower solder layer on the male structure terminal portion side,
There is an excellent effect that the two terminal portions can be connected securely and quickly and easily both electrically and mechanically.

Since the flexible lead wire according to the present invention is flat and well attached to the member to be attached, and is light in weight, it floats up when performing vibration analysis of a rotating body, or rotates and balances. There is also an advantage that the flow of fluid is not hindered when applied to a turbine blade or the like because the wiring is a thin film wiring.

[Brief description of the drawings]

FIG. 1 is a plan external view showing a configuration of a first type flexible circuit board according to the present invention in which an intermediate region is formed in a straight line.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a cross-sectional view taken along line BB in FIG.

FIG. 4 is a sectional view taken along the line CC in FIG. 1;

FIG. 5 is a plan view showing a configuration of a left-bend type second flexible circuit board according to the present invention in which an intermediate region is bent leftward by an angle α. In addition, the sectional view taken along the line DD, the sectional view taken along the line EE, and the sectional view taken along the line FF in FIG. ,
It is the same as the sectional view taken in the direction of the arrows BB and CC, and the illustration thereof is omitted.

FIG. 6 is a plan view showing a configuration of a right-bend type 2nd type flexible circuit board according to the present invention in which an intermediate region is bent rightward by an angle β. In addition, the sectional view taken along the line GG, the sectional view taken along the line HH, and the sectional view taken along the line II in the figure are respectively sectional views taken along the line AA in FIG. ,
It is the same as the sectional view taken in the direction of the arrows BB and CC, and the illustration thereof is omitted.

FIG. 7 is a plan external view showing a schematic configuration of a connection target flexible circuit board to which a flexible lead wire according to the present invention is connected.

FIG. 8 is a plan view showing a configuration of a specific function unit including a gauge pattern unit of a strain gauge, which is one of specific electric circuits formed on the connection target flexible circuit board.

9 is a partially enlarged plan view showing a detailed structure of a gauge pattern portion of the strain gauge shown in FIG.

FIG. 10 is a male terminal portion formed in one end area when one end area of one first kind flexible circuit board according to the present invention and another end area of another first kind flexible circuit board are overlapped. FIG. 10 is a state explanatory view showing a state in which the terminal and the female structure terminal formed in the other end region are overlapped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st-type flexible circuit board 1a Lower insulating thin plate 1b Upper-side insulating thin plate 2, 12, 22, 32 One end area 3, 13, 23, 33 Other end area 4 Intermediate area 11 Left bending type 2nd flexible circuit board 14 Left Bending intermediate area 15 Outer bending point 21 Right bending type 2nd flexible circuit board 24 Right bending middle area 25 Outer bending point 31 Flexible circuit board 34 to be connected 34 Intermediate area 40 Specific function part 41 Gauge body part 42, 43 Introduction terminal part 44 45 gauge tab 46 gauge pattern portion 47a-47c alignment mark 51-56 conductive foil member 51a-56a male structure terminal portion 51b-56b female structure terminal portion 51c, 52c intermediate conductive portion 53c, 54c left bent middle conductive portion 55c, 56c Right bent middle conductive part 60 Male structure joint part 61a-61c Position of one end area side Peripheral edge 62 Connection opening on male structure side 70 Female structure joint part 71a-71c Positioning peripheral part on other end area side 72 Connection opening on female structure side (60 or 70) One side joint part

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Ogura Satoru 3-5-1, Chofugaoka, Chofu-shi, Tokyo Inside Kyowa Denki Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) / 02 H01B 7/04 H01B 7/08

Claims (4)

(57) [Claims] An insulative thin plate is attached to one surface side, and a male structure joint portion having a male structure terminal portion of a built-in conductive member is provided in one end region on the other surface side, and the male structure terminal portion is provided in the other end region. A female structural joint having a female structural terminal of the built-in conductive member capable of being connected by soldering while being superposed on each other, and a connecting point on each of the male structural terminal and the female structural terminal; A flexible circuit board having a lower solder layer formed thereon, wherein a plurality of said flexible circuit boards are connected in tandem along a wiring path between two points of interest, Laminate the female structural joint of the other flexible circuit board on the male structural joint, and
An extendable flexible lead wire, characterized in that the terminal portions provided on the two superposed joint portions can be connected by soldering using the lower solder layer. 2. A linear flexible circuit having a male structural joint having a male structural terminal in one end region and a female structural joint having a female structural terminal in the other end region, and having a predetermined length. A flat first-type flexible circuit board provided with a lower solder layer at each connection point on the male structure terminal portion and the female structure terminal portion; and a male structure terminal portion at one end region. A male structural joint having the female structural terminal in the other end region, and a predetermined longitudinal direction in an intermediate region between the one end region and the other end region. Provided as a flexible circuit board of a predetermined length provided with a column direction changing portion for turning in the direction, and further, a lower solder layer was formed at each connection point on the male structure terminal portion and the female structure terminal portion. A first type flexible circuit board and a second type flexible circuit board when the wiring path having a desired shape and length is formed between two target points. The desired flexible circuit boards are selected from among the circuit boards, and they are arranged in tandem in a shape and length suitable for the shape and length of the wiring path. The lower solder layer is used to overlap the female structural joints of the other flexible circuit board adjacent to the male structural joint, and between the terminal portions provided in the two superposed joints. An extendable flexible lead wire configured to be connected by soldering to form the wiring path. 3. The flat flexible circuit board is provided between an attached insulating thin plate facing a wiring path, a non-attached insulating thin plate, and both insulating thin plates, and the male and female terminals are provided at both ends. A flexible circuit board having a three-layer structure in which a structural terminal portion and at least one plate-shaped built-in conductive member on which the female structure terminal portion is formed are closely bonded to each other; A part of the insulating thin plate on the non-attached side where the non-attached side has a male structure-side connection opening having a shape capable of exposing the surface of the male structure terminal on the non-attached side; Are arranged so as to have a connection opening on the female structure side in a shape capable of exposing both the attached side and the non-attached side surfaces of the female structure terminal part in both of the insulating thin plates where Claim 1
Or an extendable flexible lead according to item 2. 4. The extension according to claim 1, wherein said built-in conductive members of said flexible circuit board comprise a plurality of built-in conductive members arranged in parallel at a desired interval. Possible flexible leads.