Method for manufacturing flexible printed wiring board

Abstract

A method for manufacturing a flexible printed wiring board according to one embodiment of the present disclosure is a method for manufacturing a flexible printed wiring board provided with: a wiring board main body having an insulating base film and a conductive pattern laminated on one surface of the base film; and a plurality of connection terminals fixed to a terminal connection region provided on one end edge of the conductive pattern of the wiring board main body, the method for manufacturing the flexible printed wiring board comprising: a step of placing the wiring board main body on a transport board; a step for fixing the plurality of connection terminals in parallel to a component fixing jig; and a step of mounting the plurality of connection terminals fixed by the fixing step, together with the component fixing jig, in the terminal connection region of the wiring board main body placed by the placing step, a positioning mechanism being provided between the transport plate and the component fixing jig. In the mounting step, the positioning mechanism is used to mount the component fixing jig on the conveying plate.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a flexible printed wiring board.

[0002] This application claims the benefit of priority based on Japanese Application No. 2022-115864 filed on July 20, 2022, and incorporates by reference all the contents described in the aforementioned Japanese Application. Background Art

[0003] In recent years, various flexible printed wiring boards have been used in the field of electronic equipment due to the demand for miniaturization and lightness of electronic equipment. As such flexible printed wiring boards, a flexible printed wiring board having a base film as a substrate and a conductive pattern formed of copper foil or the like laminated on the surface of the base film is generally used.

[0004] Such a flexible printed wiring board includes a plurality of connection terminals connected to a conductor pattern of an electronic device (see International Publication No. 2010 / 004439). The plurality of connection terminals are mounted one by one on a connection region provided on the surface of the flexible printed wiring board, for example, using solder.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: International Publication No. 2010 / 004439 Summary of the invention

[0008] A method for manufacturing a flexible printed wiring board according to one embodiment of the present disclosure is a method for manufacturing a flexible printed wiring board having a wiring board body and a plurality of connection terminals, wherein the wiring board body has: a base film having insulating properties, and a conductive pattern laminated on one surface of the base film, wherein the plurality of connection terminals are fixed to a terminal connection area provided at one end edge of the conductive pattern of the wiring board body, and the method for manufacturing the flexible printed wiring board comprises: a step of placing the wiring board body on a conveying plate; a step of fixing the plurality of connection terminals in parallel to a component fixing fixture; and a step of installing the plurality of connection terminals fixed by the fixing step together with the component fixing fixture to the terminal connection area of ​​the wiring board body placed by the placing step, wherein a positioning mechanism is provided between the conveying plate and the component fixing fixture, and in the installing step, the component fixing fixture is installed to the conveying plate using the positioning mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic top view of a flexible printed wiring board.

[0010] Figure 2 yes Figure 1Schematic side view of a flexible printed wiring board.

[0011] Figure 3 This is a schematic flowchart showing a method for manufacturing a flexible printed wiring board according to one embodiment of the present disclosure.

[0012] Figure 4 It is a schematic perspective view of a stacked body.

[0013] Figure 5 This is a schematic perspective view showing a state where the comb teeth and the position fixing holes are formed by a comb teeth forming die in the comb teeth forming step.

[0014] Figure 6 It is a schematic plan view showing a state where the wiring board main body is placed on the conveying plate.

[0015] Figure 7 It is shown Figure 6 A schematic side view of the state.

[0016] Figure 8 This is a schematic side view showing a state where the connection terminal is fixed to the component fixing jig in the connection terminal fixing step.

[0017] Fig. 9 It is shown Figure 8 Schematic bottom view of the component fixing fixture.

[0018] Fig.10 It is shown Figure 8 Schematic front view of the component fixing fixture.

[0019] Fig.11 The connecting terminal is fixed to Figure 8 A schematic front view of the state of the components when fixed by a fixture.

[0020] Fig.12 It is a schematic side view showing a state where the component fixing jig and the wiring board main body are placed on the conveying plate.

[0021] Fig.13 It shows that Fig.12 A schematic side view of a state where a component fixing jig and a wiring board main body according to a different embodiment are placed on a conveying plate. DETAILED DESCRIPTION

[0022] [Technical Problems to be Solved by the Present Disclosure]

[0023] Generally, the connection terminals are long and narrow in pitch, so the pitch between the connection terminals becomes unstable due to slight installation deviation. Therefore, high-precision installation is required, for example, high-precision alignment is required using machinery. In addition, since the terminals are installed one by one, the productivity is low.

[0024] The present disclosure has been made based on the above-mentioned circumstances, and a technical object thereof is to provide a method for manufacturing a flexible printed wiring board that can easily mount connection terminals and has high productivity.

[0025] [Effects of the present disclosure]

[0026] The method for manufacturing a flexible printed wiring board disclosed herein can easily mount connection terminals with high productivity.

[0027] [Description of Embodiments of the Present Disclosure]

[0028] A method for manufacturing a flexible printed wiring board according to one embodiment of the present disclosure is a method for manufacturing a flexible printed wiring board having a wiring board body and a plurality of connection terminals, wherein the wiring board body has: a base film having insulating properties, and a conductive pattern laminated on one surface of the base film, wherein the plurality of connection terminals are fixed to a terminal connection area provided at one end edge of the conductive pattern of the wiring board body, and the method for manufacturing the flexible printed wiring board comprises: a step of placing the wiring board body on a conveying plate; a step of fixing the plurality of connection terminals in parallel to a component fixing fixture; and a step of installing the plurality of connection terminals fixed by the fixing step together with the component fixing fixture to the terminal connection area of ​​the wiring board body placed by the placing step, wherein a positioning mechanism is provided between the conveying plate and the component fixing fixture, and in the installation step, the component fixing fixture is installed to the conveying plate using the positioning mechanism.

[0029] In the manufacturing method of the flexible printed wiring board, a plurality of connection terminals are fixed in parallel to a component fixing fixture for installation at one time, so the productivity is high. In addition, directional deviation is not easy to occur between the connection terminals. Furthermore, in the manufacturing method of the flexible printed wiring board, the component fixing fixture is positioned and installed with the conveying plate as a reference by a positioning mechanism between the conveying plate supporting the wiring board body and the component fixing fixture. Generally, the positioning between the flexible printed wiring board and the conveying plate is performed by an installation machine, but according to the manufacturing method of the flexible printed wiring board, for example, manual installation is also possible. That is, by using the manufacturing method of the flexible printed wiring board, the connection terminals can be easily installed.

[0030] The positioning mechanism may include a columnar portion provided on the component fixing jig, and a positioning hole provided on the conveying plate and capable of being fitted with the columnar portion. By configuring the positioning mechanism as described above, the component fixing jig can be easily mounted on the conveying plate.

[0031] The wiring board body may be provided with a wiring board body fixing hole into which the columnar portion can be fitted, and in the installation process, the wiring board body fixing hole is used to position the wiring board body and the component fixing fixture. By providing the wiring board body fixing hole in this way, the conveying plate, the wiring board body, and the component fixing fixture can be positioned at once via the columnar portion, thereby improving the installation accuracy of the connection terminal.

[0032] The positioning mechanism may include a plurality of pairs of the columnar portions and the positioning holes. By including a plurality of pairs of the columnar portions and the positioning holes in this manner, the component fixing jig can be positioned more reliably.

[0033] The above-mentioned multiple columnar portions can be arranged in a non-point-symmetrical manner relative to the geometric center of gravity position in the shape of the above-mentioned component fixing fixture when viewed from above. By arranging the above-mentioned columnar portions in a non-point-symmetrical manner relative to the geometric center of gravity position in the shape of the above-mentioned component fixing fixture when viewed from above, incorrect installation can be easily avoided. It should be noted that the "geometric center of gravity position in the shape of the component fixing fixture when viewed from above" refers to the center of gravity position determined only by the shape of the component fixing fixture when viewed from above, and is the center of gravity position that does not take into account the density difference of each part. For example, in the case where the component fixing fixture is a rectangle when viewed from above, the geometric center of gravity position is the intersection of the two diagonals of the rectangle.

[0034] It should be noted that “laminated on one surface” is a concept that includes not only the case of being directly laminated on one surface but also the case of being indirectly laminated via other layers.

[0035] [Details of Embodiments of the Invention]

[0036] Hereinafter, an embodiment of a method for manufacturing a flexible printed wiring board according to the present invention will be described in detail with reference to the drawings.

[0037] 〔Flexible printed wiring board〕

[0038] First, use Figure 1 and Figure 2 , a flexible printed wiring board 1 manufactured by the manufacturing method of the flexible printed wiring board involved in the present disclosure is described. Figure 1 and Figure 2As shown, the flexible printed wiring board 1 includes a wiring board body 10 and a plurality of connection terminals 14. The wiring board body 10 includes: an insulating base film 11, and a conductive pattern 12 laminated on one surface of the base film 11. In addition, the plurality of connection terminals 14 are fixed to a terminal connection region 12a provided at one end edge of the conductive pattern 12 of the wiring board body 10.

[0039] <Base film>

[0040] The base film 11 is a member that supports the conductive pattern 12 and is a structural material that ensures the strength of the flexible printed wiring board 1 .

[0041] As the main component of the base film 11, for example, soft materials such as polyimide, liquid crystal polymer represented by liquid crystal polyester, polyethylene terephthalate, polyethylene naphthalate, polyphenylene ether, fluororesin, hard materials such as paper phenol, paper epoxy, glass composite material, glass epoxy, glass substrate, and rigid flexible materials formed by compounding soft materials with hard materials can be used. Among them, polyimide with excellent heat resistance is preferred. It should be noted that the base film 11 can also be a porous film, and in addition, it can also contain fillers, additives, etc. Here, the "main component" refers to the component with the largest content, which is a component with a content of more than 50% by mass.

[0042] The thickness of the base film 11 is not particularly limited. As the lower limit of the average thickness of the base film 11, it is preferably 5 μm, and more preferably 12 μm. In addition, as the upper limit of the average thickness of the base film 11, it is preferably 500 μm, and more preferably 200 μm. If the average thickness of the base film 11 is less than the above lower limit, the strength of the base film 11 may become insufficient. On the other hand, if the average thickness of the base film 11 exceeds the above upper limit, the flexibility of the above-mentioned flexible printed wiring board 1 may become insufficient. Here, the "average thickness" refers to the average value of the thickness measured at any ten locations.

[0043] The base film 11 has one or more holes 11a for fixing positions. The holes 11a for fixing positions are provided through the cover layer 13. In addition, when the holes 11a for fixing positions overlap with the conductive pattern 12 in a plan view, the holes 11a for fixing positions are provided through the conductive pattern 12. When the wiring board body 10 is placed on the conveying plate 2 to be described below, the positioning pins 21a are inserted into the holes 11a for fixing positions, thereby fixing the wiring board body 10 in position (see Figure 6 , Figure 7 ).

[0044] The shape of the position fixing hole 11a when viewed from above is not particularly limited, and may be, for example, a polygon, but is preferably Figure 1If the position fixing hole 11 a is circular in plan view, it is easy to insert when used for alignment with the conveying plate 2 and the strength of the base film 11 can be suppressed from decreasing.

[0045] The number of the position fixing holes 11a is preferably 2 or more and 5 or less, and more preferably 2 or 3. If the number of the position fixing holes 11a is less than the lower limit, that is, 1, the wiring board body 10 fixed to the conveying plate 2 is likely to rotate around the position fixing holes 11a, and the position fixing may not be sufficiently performed. On the other hand, if the number of the position fixing holes 11a exceeds the upper limit, the number of positioning pins 21a to be inserted when the wiring board body 10 is fixed to the conveying plate 2 increases unnecessarily, and the workability may be reduced.

[0046] The position fixing hole 11a is provided at a position that does not affect the circuit pattern formed on the flexible printed wiring board 1, but is preferably provided in or near the terminal connection area 12a. By providing the position fixing hole 11a in or near the terminal connection area 12a, the position fixing hole 11a is located at one end edge of the conductive pattern 12 that is relatively close to the connection terminal 14, so that the relative position deviation with the component fixing jig 3 described below can be easily suppressed.

[0047] The lower limit of the distance between the position fixing hole 11a and the one end edge (the distance between the center of the position fixing hole 11a and the one end edge) is preferably 4 mm, and more preferably 5 mm. On the other hand, the upper limit of the distance between the position fixing hole 11a and the one end edge is preferably 50 mm, and more preferably 40 mm. If the distance between the position fixing hole 11a and the one end edge is less than the lower limit, the position fixing hole 11a may interfere with the connection terminal 14. On the contrary, if the distance between the position fixing hole 11a and the one end edge exceeds the upper limit, the relative position deviation with the component fixing fixture 3 may be easily generated.

[0048] The lower limit of the diameter of the position fixing hole 11a when viewed from above (the length of the diagonal line when the position fixing hole 11a is a polygon) is preferably 0.5 mm, and more preferably 1 mm. On the other hand, the upper limit of the diameter of the position fixing hole 11a is preferably 5 mm, and more preferably 4 mm. If the diameter of the position fixing hole 11a is less than the above lower limit, the positioning pin 21a becomes too thin and may become easily damaged. On the contrary, if the diameter of the position fixing hole 11a exceeds the above upper limit, the strength of the base film 11 may decrease due to the position fixing hole 11a.

[0049] When a plurality of position fixing holes 11a are provided, the lower limit of the center-to-center distance (minimum distance) of adjacent position fixing holes 11a is preferably 1 mm, and more preferably 2 mm. If the center-to-center distance of the position fixing holes 11a is less than the above lower limit, the effect of improving the alignment accuracy may be insufficient. On the other hand, the upper limit of the center-to-center distance of the position fixing holes 11a is not particularly limited, and is determined, for example, by the width of the base film 11.

[0050] <Conductive Pattern>

[0051] The conductive pattern 12 constitutes an electrical wiring structure, a grounding structure, a shielding structure, and the like.

[0052] The material forming the conductive pattern 12 is not particularly limited as long as it is a conductive material, and examples thereof include metals such as copper, aluminum, and nickel, and copper is generally used because it is relatively inexpensive and has a high conductivity.

[0053] The lower limit of the average thickness of the conductive pattern 12 is preferably 2 μm, and more preferably 5 μm. On the other hand, the upper limit of the average thickness of the conductive pattern 12 is preferably 100 μm, and more preferably 70 μm. If the average thickness of the conductive pattern 12 is less than the above lower limit, the conductivity of the conductive pattern 12 may become insufficient. On the contrary, if the average thickness of the conductive pattern 12 exceeds the above upper limit, the flexible printed wiring board 1 may become unnecessarily thick.

[0054] The terminal connection area 12a of the flexible printed wiring board 1 at one end edge of the conductive pattern 12 is an area for connecting to other electronic devices or the like via the connection terminal 14 to be described below. In the terminal connection area 12a, the cover layer 13 to be described below is removed. Specifically, in order to connect to other electronic devices or the like, the terminal connection area 12a is provided at the peripheral portion of the flexible printed wiring board 1 (for example, in the case of a square flexible printed wiring board 1, at one of its short sides), and the terminal (one end edge) of the conductive pattern 12 is configured to be connected to the connection terminal 14 provided in the terminal connection area 12a.

[0055] like Figure 1 As shown, the terminal connection area 12a is shaped like the teeth of a comb formed by branching from one end edge. A connection terminal 14 is provided on each comb tooth portion 15 of the teeth of the comb.

[0056] The size of the comb teeth 15 is appropriately determined according to the size of the connection terminals 14, and can be, for example, an average width of 0.5 mm or more and 3 mm or less, and an average length of 3 mm or more and 50 mm or less. In addition, the number of comb teeth 15 is determined corresponding to the number of connection terminals 14. Usually, the width of the base film 11 including the terminal connection area 12a is set to be fixed, but depending on the number of connection terminals 14, sometimes it cannot be accommodated in the width of the base film 11 other than the terminal connection area 12a. In such a case, for example Figure 1 As shown, by increasing the width of the base film 11 at the one end edge, the number of comb-tooth portions 15 can be ensured.

[0057] <Overlay>

[0058] The cover layer 13 protects the conductive pattern 12 from external force, moisture, etc. The cover layer 13 includes a cover film and a bonding layer. The cover layer 13 is formed by laminating the cover film on the surface of the conductive pattern 12 opposite to the base film 11 via the bonding layer.

[0059] (covering film)

[0060] The material of the cover film is not particularly limited, and for example, the same material as the resin constituting the base film 11 can be used.

[0061] The lower limit of the average thickness of the cover film is preferably 5 μm, and more preferably 10 μm. On the other hand, the upper limit of the average thickness of the cover film is preferably 50 μm, and more preferably 30 μm. If the average thickness of the cover film is less than the lower limit, the insulation may become insufficient. On the contrary, if the average thickness of the cover film exceeds the upper limit, the flexibility of the flexible printed wiring board 1 may be impaired.

[0062] (Joint layer)

[0063] The bonding layer fixes the cover film to the conductive pattern 12 and the base film 11. The material of the bonding layer is not particularly limited as long as it can fix the cover film to the conductive pattern 12 and the base film 11, and is preferably a material with excellent flexibility or heat resistance, such as polyimide, polyamide, epoxy, butyral, acrylic acid, etc. In addition, in terms of heat resistance, a thermosetting resin is preferred.

[0064] The average thickness of the bonding layer is not particularly limited. As the lower limit of the average thickness of the bonding layer, for example, 5 μm is preferred, and 10 μm is more preferred. On the other hand, as the upper limit of the average thickness of the bonding layer, for example, 100 μm is preferred, and 80 μm is more preferred. If the average thickness of the bonding layer is less than the lower limit, the bonding property may become insufficient. On the contrary, if the average thickness of the bonding layer exceeds the upper limit, the flexibility of the flexible printed wiring board 1 may be impaired.

[0065] <Connection Terminals>

[0066] The connection terminal 14 is a component for connecting the flexible printed wiring board 1 to other electronic devices or the like.

[0067] The material of the connection terminal 14 is not particularly limited as long as it has conductivity. For example, the connection terminal 14 can be made of metal. Examples of the metal include soft copper, brass, phosphor bronze, etc. In addition, in order to prevent oxidation, it is preferred to plate the surface of the connection terminal 14. Examples of the plating include Sn plating, Ni plating, Au plating, etc. Among them, Ni plating is preferred because it is inexpensive and has excellent corrosion resistance.

[0068] The shape of the connection terminal 14 is appropriately determined according to the terminal shape of the electronic device to be connected, and is generally vertically long (a shape that is long in the length direction of the base film 11). The shape of the connection terminal 14 can be, for example, a plate-like shape or a three-dimensional shape formed by molding with an average width of 0.5 mm to 3 mm, an average length of 3 mm to 50 mm, and an average height of 0.1 mm to 3 mm.

[0069] In addition, a portion of the connection terminal 14 protrudes from the above-mentioned one end edge. The average length of the protruding portion depends on the terminal shape of the electronic device to be connected, etc., and is preferably 20% or more and 80% or less of the average length of the connection terminal 14. If the average length of the protruding portion is less than the above-mentioned lower limit, the bonding strength with other electronic devices, etc. may be insufficient. On the contrary, if the average length of the protruding portion exceeds the above-mentioned upper limit, the bonding strength with the flexible printed wiring board 1 may be insufficient.

[0070] [Method for manufacturing flexible printed wiring board]

[0071] like Figure 3 As shown, the method for manufacturing a flexible printed wiring board includes a laminate forming step S1, a comb-teeth forming step S2, a wiring board body placing step S3, a connection terminal fixing step S4, a connection terminal mounting step S5, and a jig removing step S6.

[0072] <Laminate Forming Step>

[0073] In the laminate forming step S1, a laminate 16 is formed, which includes an insulating base film 11, a conductive pattern 12 laminated on one surface of the base film 11, and a cover layer 13 laminated on one surface of the base film 11 or the conductive pattern 12 (see Figure 4 ). Specifically, follow the steps below.

[0074] First, a conductor layer is formed on one surface of the base film 11 .

[0075] The conductor layer can be formed, for example, by bonding a foil-shaped conductor using a bonding agent, or by a known film-forming method. The conductor is made of the same material as the material constituting the conductive pattern 12, and examples thereof include copper, silver, gold, nickel, and the like. As a bonding agent, there is no particular limitation as long as it is a bonding agent that can bond a conductor to the base film 11, and various known bonding agents can be used. As a film-forming method, for example, vapor deposition, plating, and the like can be cited. Preferably, the conductor layer is formed by bonding a copper foil to the base film 11 using a polyimide bonding agent.

[0076] Next, the conductive layer is patterned to form the conductive pattern 12 .

[0077] The conductor layer can be patterned by a known method such as photolithography. Photolithography is performed by forming a resist film having a predetermined pattern on one surface of the conductor layer and then treating the conductor layer exposed from the resist film with an etching solution to remove the resist film.

[0078] Finally, the cover layer 13 is laminated in a manner covering the conductive pattern 12 except for the terminal connection region 12a at one end edge of the conductive pattern 12. Specifically, an adhesive layer is laminated on the surface of the base film 11 on which the conductive pattern 12 is formed, and a cover film is laminated on the adhesive layer. Alternatively, an adhesive layer may be laminated on the cover film in advance, and the surface of the cover film on which the adhesive layer is laminated is bonded to the conductive pattern 12 opposite to each other.

[0079] The bonding of the cover films using the bonding agent can usually be performed by thermocompression bonding. The temperature and pressure during thermocompression bonding may be appropriately determined according to the type and composition of the bonding agent used.

[0080] As described above, the laminated body 16 can be formed.

[0081] <Comb Teeth Forming Step>

[0082] In the comb-teeth forming step S2, the comb-teeth 15 are formed at one end edge of the conductive pattern 12 of the laminate 16 formed in the laminate forming step S1. It should be noted that the patterned shape of the conductive pattern 1 in the portion where the comb-teeth 15 are formed is not particularly limited, and for example, the patterned shape can be a shape in which the comb-teeth 15 are connected to each pattern one by one.

[0083] like Figure 5As shown, the comb-tooth portion 15 can be formed by punching out the comb-tooth portion 15 and the gap between the comb-tooth portion 15 (comb-tooth portion forming die 17). The comb-tooth portion forming die 17 has a punching die 17a corresponding to the gap between the comb-tooth portions 15, and has a punching die 17b corresponding to the position fixing hole 11a. Thus, the position fixing hole 11a can be formed using the die that forms the comb-tooth portion 15. By using the same die to form the comb-tooth portion 15 and the position fixing hole 11a in this way, the relative relationship between the direction of the comb of the comb-tooth portion 15 and the direction of the position fixing hole 11a can be always kept fixed. Therefore, it is not easy to cause a deviation between the direction of the comb and the direction of the position fixing hole 11a, so the installation error of the connection terminal 14 caused by the direction deviation can be reduced.

[0084] The material of the comb-tooth portion forming die 17 is not particularly limited, and may be, for example, general carbon tool steel (SK material). The shape of the comb-tooth portion forming die 17 is appropriately determined to be a shape capable of processing the comb-tooth portion 15 and the position fixing hole 11a.

[0085] As described above, wiring board main body 10 is formed.

[0086] <Wiring Board Main Body Mounting Step>

[0087] In the wiring board main body placement step S3, Figure 6 and Figure 7 As shown, the wiring board main body 10 is placed on the conveying plate 2 .

[0088] The conveyor plate 2 is a plate used when manufacturing the flexible printed wiring board 1. The conveyor plate 2 has a certain strength and is made of, for example, a metal plate such as SUS, aluminum, titanium, a resin plate such as glass epoxy, or a laminate of glass cloth.

[0089] The size of the conveying plate 2 in a plan view is set to a size capable of mounting the wiring board main body 10 and the component fixing jig 3 described below, and the shape thereof can be set to a square, for example.

[0090] exist Figure 6 and Figure 7 In the wiring board main body placement step S3 shown, positioning plate 21 is used for aligning conveyor plate 2 and wiring board main body 10 . Figure 6 and Figure 7 The positioning plate 21 shown has the same shape as the conveying plate 2 in a plan view, but the positioning plate 21 may be larger than the conveying plate 2 or may be configured so that a plurality of conveying plates 2 can be placed on one positioning plate 21 .

[0091] The positioning plate 21 is provided with columnar positioning pins 21a for fixing the wiring board body 10. The conveying plate 2 is provided with through holes 2a which are continuous with the position fixing holes 11a when the wiring board body 10 is placed.

[0092] The wiring board body 10 is fixed to the conveying plate 2 by inserting the positioning pin 21a into the conveying plate 2 (so that the positioning pin 21a passes through the through hole 2a) and then into the position fixing hole 11a of the wiring board body 10. Specifically, the position fixing hole 11a and the through hole 2a can be configured to have the same diameter (the cross section has the same shape). In addition, the length of the positioning pin 21a is at least greater than the length of the through hole 2a, and preferably greater than the sum of the length of the position fixing hole 11a and the length of the through hole 2a. The cross section of the positioning pin 21a is the same size as the position fixing hole 11a and the through hole 2a, and is preferably set to a size that can pass through the position fixing hole 11a and the through hole 2a.

[0093] That is, in the wiring board body placing step S3 of placing the wiring board body 10 , the wiring board body 10 is placed on the conveying plate 2 so that the position fixing holes 11 a overlap with the through holes 2 a in a plan view and is fixed by the positioning pins 21 a .

[0094] It should be noted that the order of the wiring board main body placement step S3 and the next step, the connection terminal fixing step S4, is not limited. The wiring board main body placement step S3 may be performed after the connection terminal fixing step S4.

[0095] <Connection terminal fixing process>

[0096] In the connection terminal fixing step S4, Figure 8 , Fig. 9 and Fig.10 As shown, a plurality of connection terminals 14 are fixed in parallel to the component fixing jig 3 .

[0097] For example Figure 8 , Fig. 9 and Fig.10 As shown, the component fixing jig 3 used in the connection terminal fixing step S4 includes an upper jig 31 constituting an upper portion of the component fixing jig 3 , a lower jig 32 into which the upper jig 31 can be fitted, and a holding hole 33 capable of holding the connection terminal 14 .

[0098] The component fixing jig 3 is in the shape of a rectangular parallelepiped as a whole. The material of the component fixing jig 3 is not particularly limited, and for example, it can be a general carbon tool steel (SK material).

[0099] When the upper jig 31 and the lower jig 32 are fitted together, the recessed portion provided on the bottom surface of the upper jig 31 and the recessed portion provided on the top surface of the lower jig 32 are combined in the up-down direction to form the holding hole 33 .

[0100] The number of holding holes 33 is the same as the number of connection terminals 14 of the manufactured flexible printed wiring board 1, and the interval between adjacent holding holes 33 is also the same as the interval between adjacent connection terminals 14. The depth of the holding holes 33 of the component fixing jig 3 is determined in accordance with the average length of the protruding portion of the connection terminal 14 after installation.

[0101] In the case of the above-mentioned component fixing jig 3, a plurality of connection terminals 14 can be fixed in parallel as follows. That is, first, the connection terminals 14 are respectively inserted into the recessed portions of the lower jig 32. Next, the upper jig 31 is inserted into the lower jig 32 from above (see Fig.11 At this time, the recessed portion provided in the upper clamp 31 and the recessed portion provided in the lower clamp 32 are combined to fix the connection terminal 14 to the holding hole 33 .

[0102] <Connection terminal installation process>

[0103] In the connection terminal mounting step S5 , the plurality of connection terminals 14 fixed in the fixing step (connection terminal fixing step S4 ) are mounted together with the component fixing jig 3 in the terminal connection region 12 a of the wiring board body 10 mounted in the mounting step (wiring board body mounting step S3 ).

[0104] In this process, if Fig.12 As shown, the component fixing jig 3 is mounted on the conveying plate 2 using a positioning mechanism 4 provided between the conveying plate 2 and the component fixing jig 3. First, the positioning mechanism 4 will be described below.

[0105] The positioning mechanism 4 includes a Figure 8 , Fig. 9 and Fig.10 The columnar portion 41 of the component fixing fixture 3 shown in FIG. Figure 6 The positioning hole 42 is provided in the conveying plate 2 and can be fitted with the columnar portion 41. By configuring the positioning mechanism 4 as described above, the component fixing jig 3 can be easily attached to the conveying plate 2.

[0106] The positioning mechanism 4 may include a plurality of pairs of columnar portions 41 and positioning holes 42. By including a plurality of pairs of columnar portions 41 and positioning holes 42 in this manner, the component fixing jig 3 can be positioned more reliably. Figure 8 , Fig. 9 and Fig.10The positioning mechanism 4 shown has two pairs of columnar portions 41 and positioning holes 42. The following description will be continued by taking the case of having two pairs of columnar portions 41 and positioning holes 42 as an example, but the number of columnar portions 41 and positioning holes 42 is not limited to two pairs, and may also be one pair or more than three pairs.

[0107] It is preferred that the plurality of columnar portions 41 are arranged non-point symmetrically with respect to the geometric center of gravity position G in the plan view of the component fixing jig 3. By arranging the columnar portions 41 non-point symmetrically with respect to the geometric center of gravity position G in the plan view of the component fixing jig 3 in this way, incorrect installation can be easily avoided. That is, if the component fixing jig 3 is to be installed with the front and back or left and right turned upside down, the plurality of pairs of columnar portions 41 and a part of the positioning holes 42 are inconsistent or installed at significantly different positions, so that the operator can easily understand the installation error.

[0108] The top view shape of the columnar portion 41 can be as follows: Fig. 9 The shape of the columnar portion 41 when viewed from above is set to be circular. If the shape when viewed from above is circular, it is easy to insert the component fixing fixture 3 when used to align with the conveying plate 2. On the other hand, the shape of the columnar portion 41 when viewed from above may also be a polygon such as a triangle. In this case, the insertion direction is limited, so even if there is only a pair of columnar portions 41 and positioning holes 42, incorrect installation can be avoided.

[0109] It is preferred that the top view shape of the positioning hole 42 is the same as the top view shape of the columnar portion 41. Figure 7 As shown, the positioning hole 42 may penetrate the conveying plate 2 , but may also be a recessed portion deeper than the length of the columnar portion 41 .

[0110] In addition, if Figure 6 As shown, the positioning mechanism 4 may also include a bottom fitting portion 43 provided on the conveying plate 2 and capable of fitting with the bottom of the component fixing jig 3. If the bottom fitting portion 43 is provided in this way, the component fixing jig 3 can be easily mounted. In addition, the bottom fitting portion 43 can also be used as an adjustment margin for making the height of the connection terminal 14 fixed to the component fixing jig 3 coincide with the height of the terminal connection area 12a of the wiring board body 10.

[0111] In the connection terminal installation process S5, if the component fixing jig 3 is installed on the conveying plate 2 in a manner that the bottom of the component fixing jig 3 is engaged with the bottom engaging portion 43, the columnar portion 41 is inevitably guided to the corresponding positioning hole 42 and inserted. In this way, the component fixing jig 3 can be installed on the conveying plate 2. At this time, the component fixing jig 3 is fixed on the conveying plate 2 mainly by the columnar portion 41 and the positioning hole 42 so as not to move, and the plurality of connection terminals 14 are placed at the installation positions of the corresponding comb tooth portions 15.

[0112] Then, the solder is melted by reflow soldering, and the connection terminals 14 are soldered to the conductive pattern 12. It should be noted that the positioning plate 21 is usually removed after the plurality of connection terminals 14 are placed at the corresponding mounting positions of the comb-tooth portions 15 and before reflow soldering.

[0113] <Jig removal process>

[0114] In the jig removal step S6 , the component fixing jig 3 is removed after the connection terminal mounting step S5 .

[0115] The component fixing jig 3 is removed, and the connection terminal 14 is mounted to form the flexible printed wiring board 1 .

[0116] <Advantages>

[0117] In the manufacturing method of the flexible printed wiring board, a plurality of connection terminals 14 are fixed in parallel to the component fixing fixture 3 for installation at one time, so the productivity is high. In addition, it is not easy to cause directional deviation between the connection terminals 14. Furthermore, in the manufacturing method of the flexible printed wiring board, the component fixing fixture 3 is positioned and installed with the conveying plate 2 as a reference by the positioning mechanism 4 between the conveying plate 2 supporting the wiring board body 10 and the component fixing fixture 3. Therefore, it is not necessary to use a machine to align with high precision as in the case of positioning between the flexible wiring board body 10, and it can also be installed manually, for example. That is, by using the manufacturing method of the flexible printed wiring board, the connection terminal 14 can be easily installed.

[0118] [Other embodiments]

[0119] The embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present disclosure is not limited to the configuration of the above-described embodiments, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0120] In the above embodiment, the positioning mechanism is described as being composed of a columnar portion provided on the component fixing fixture and a positioning hole provided on the conveying plate and capable of being engaged with the columnar portion. However, as long as the positioning mechanism is provided between the conveying plate and the component fixing fixture, other configurations may be adopted. For example, the columnar portion may be provided on the conveying plate, and the positioning hole may be provided on the component fixing fixture. Alternatively, the positioning mechanism may be composed of only a bottom engaging portion capable of being engaged with the bottom of the component fixing fixture.

[0121] In addition, if Fig.13As shown, the following structure can also be used: a wiring board body fixing hole 11b into which the columnar portion 44 of the positioning mechanism 4 can be fitted is provided on the wiring board body 10, and the wiring board body fixing hole 11b is used in the above-mentioned connection terminal installation process (installation process) to perform positioning between the wiring board body 10 and the component fixing fixture 3. In this case, the wiring board body fixing hole 11b also serves as a positioning hole for the conveying plate 2 and the above-mentioned component fixing fixture. By providing the wiring board body fixing hole 11b in this way, the conveying plate 2, the wiring board body 10 and the component fixing fixture 3 can be positioned at one time via the columnar portion 44, thereby improving the installation accuracy of the connection terminal 14. In such a structure, Fig.13 As shown, a configuration without using a positioning plate is also possible.

[0122] In the above-mentioned embodiment, the case where the manufacturing method of the flexible printed wiring board includes the laminate forming step is described, but the laminate forming step is not an essential component. The manufacturing method of the flexible printed wiring board can also be applied to a laminate prepared in advance.

[0123] In the above-mentioned embodiment, the manufacturing method of the flexible printed wiring board is described as having a comb-teeth forming step, but the comb-teeth forming step is not an essential component. The manufacturing method of the flexible printed wiring board can also be used for a flexible printed wiring board that is not provided with comb-teeth, for example, a terminal connection area that is square when viewed from above.

[0124] In the above-mentioned embodiment, the method for manufacturing the flexible printed wiring board is described as including a jig disassembling step, but the jig disassembling step is not an essential component. For example, when the component fixing jig is directly used as a part of the flexible printed wiring board, such as a housing of a connection terminal, it is not necessary to disassemble the jig, and the jig disassembling step can be omitted.

[0125] In the above embodiment, the case where the position fixing hole is formed using the mold for forming the comb teeth in the comb teeth forming step is described, but the comb teeth and the position fixing hole may be formed separately using different molds. When the comb teeth and the position fixing hole are formed separately, the connection terminal can be easily mounted by using the manufacturing method of the flexible printed wiring board.

[0126] In the above embodiment, the case where a plurality of connection terminals are installed at once using a component fixing fixture is described, but as long as there are a plurality of connection terminals to be installed at one time, they can also be installed in batches. By performing batch installation, the number of connection terminals to be fixed at one time is reduced, so the component fixing fixture can be miniaturized. As the upper limit of the number of batches in the case of performing batch installation, it is preferably 4, more preferably 3, and further preferably 2. If the number of batches exceeds the above upper limit, the installation accuracy may decrease, or the productivity may decrease.

[0127] The shape of the component fixing jig is not limited to the above-described embodiment, and a configuration may be adopted in which the portion for fixing the connection terminal is provided only as a recessed portion provided in, for example, a lower jig of the component fixing jig without providing an upper jig.

[0128] The flexible printed wiring board is not limited to the above-described embodiment, and the method for manufacturing a flexible printed wiring board can also be used for a flexible printed wiring board including a reinforcing portion on the other surface of a base film, a flexible printed wiring board not including a cover layer, or the like.

[0129] Description of Reference Numerals

[0130] 1 Flexible printed wiring board

[0131] 10 Wiring board main body

[0132] 11 Basement membrane

[0133] 11a Position fixing hole

[0134] 11b Wiring board main body fixing hole

[0135] 12 Conductive pattern

[0136] 12a Terminal connection area

[0137] 13 Covering

[0138] 14 Connection terminals

[0139] 15 Comb teeth

[0140] 16 Laminated body

[0141] 17 Comb tooth forming mold

[0142] 17a, 17b punching die

[0143] 2 Conveyor plate

[0144] 2a Through hole

[0145] 21 Positioning plate

[0146] 21a Locating pin

[0147] 3. Component Fixing Fixture

[0148] 31 Upper clamp

[0149] 32 Lower clamp

[0150] 33 Keeping hole

[0151] 4 Positioning mechanism

[0152] 41, 44 columnar part

[0153] 42 Positioning holes

[0154] 43 Bottom fitting part

[0155] G Geometric center of gravity position.

Claims

1. A method for manufacturing a flexible printed wiring board, comprising: a wiring board body and a plurality of connection terminals, wherein the wiring board body comprises: a base film having insulating properties, and a conductive pattern laminated on one surface of the base film, wherein the plurality of connection terminals are fixed to a terminal connection region provided at one end edge of the conductive pattern of the wiring board body, The method for manufacturing the flexible printed wiring board comprises: The step of placing the wiring board body on a conveyor plate; The step of fixing the plurality of connection terminals in parallel to a component fixing fixture; and a step of attaching the plurality of connection terminals fixed in the fixing step together with the component fixing jig to the terminal connection region of the wiring board body placed in the placing step, A positioning mechanism is provided between the conveying plate and the component fixing jig, and in the mounting step, the component fixing jig is mounted on the conveying plate using the positioning mechanism.

2. The method for manufacturing a flexible printed wiring board according to claim 1, The positioning mechanism includes a columnar portion provided on the component fixing jig, and a positioning hole provided on the conveying plate and capable of being fitted with the columnar portion.

3. The method for manufacturing a flexible printed wiring board according to claim 2, The wiring board body is provided with a wiring board body fixing hole into which the columnar portion can be fitted, and in the mounting step, the wiring board body and the component fixing jig are positioned using the wiring board body fixing hole.

4. The method for manufacturing a flexible printed wiring board according to claim 2 or 3, The positioning mechanism has a plurality of pairs of the columnar portions and the positioning holes.

5. The method for manufacturing a flexible printed wiring board according to claim 4, The plurality of columnar portions are disposed asymmetrically with respect to a position of a geometric center of gravity in a plan view of the component fixing jig.

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