JP4359465B2 - Connection structure between flexible printed circuit board and hard circuit board, and pressing jig used for the connection structure - Google Patents

Description

  The present invention relates to a connection structure between a flexible printed circuit board (hereinafter referred to as “FPC”) used in a mobile phone, a notebook computer, a digital camera, and the like and a hard substrate.

One type of connector used in mobile phones, CCD cameras, etc., mainly has a housing and contacts, and has a structure in which an FPC is inserted into the housing and brought into contact with the contact portion (so-called non-ZIF type). Another different type mainly includes a housing, a contact, and a slider, and a structure in which the FPC is sandwiched between the housing and the slider (so-called ZIF type and piano touch type). There are various methods for holding the FPC between the housing and the slider. In particular, the FPC is inserted into the housing and then the slider is inserted and the FPC is pressed against the contact, or the slider is rotated after the FPC is inserted into the housing. In many cases, the FPC is pressed against the contact.
The housing is provided with a required number of insertion holes into which the contacts are inserted and a fitting port into which the FPC is inserted.
The contact mainly includes a contact portion that comes into contact with the FPC, a connection portion that is connected to a hard substrate or the like, and a fixed portion that is fixed to the housing. This contact is fixed to the housing by press fitting or the like.
Examples of Patent Document 1 (Japanese Utility Model Publication No. 6-60983) as a ZIF type and Patent Document 2 (Japanese Patent Laid-Open No. 13-257020) as a piano touch type are shown below.
In addition, the present applicant has proposed Patent Document 3 (Japanese Patent Application No. 2003-29198) and Patent Document 4 (Japanese Patent Application No. 2003-119167) in order to realize a low profile.
For example, Japanese Utility Model Publication No. 6-60983 is available as a zero insertion force structure. According to the summary of Japanese Utility Model Laid-Open No. 6-60983, the object is related to a connector for a printed circuit board with a slider used in a narrow space in an electronic device or a communication device. A U-shaped arm portion fixed on the front side is formed as an insertion guide to the housing into which the slider is inserted, and a convex portion is provided on the open end side of the U-shaped arm portion. A notch is provided so that the open end of the arm can be seen from the insertion direction, and a protruding part having an inclined surface that engages the convex part of the slider is provided on both side ends of the housing, and the slider is connected to the flexible printed circuit board. When the slider is inserted into the housing together with the terminal portion, the protruding portion of the slider gets over the protruding portion having the inclined surface of the housing. U-shaped open end of the arm portion of the shape is expanded outwardly temporarily and connector open end upon completion of insertion was made to return to the normal position is disclosed. The so-called piano touch structure is disclosed in Japanese Patent Application Laid-Open No. 13-257020 for the purpose of surely aligning the contact of the connector with the FPC or FFC pattern. Projections are arranged on the ridge lines between the contacts of the connector terminal block on the opening side to be inserted, and after inserting the FPC or FFC into the terminal block, the slider is moved to move the FPC or FFC to the above-mentioned position. When the FPC or FFC is pressed against the contact by the slider and electrically connected to the contact by the slider, the protrusion enters a recess between the FPC or FFC patterns, so that the connector contact and the FPC or FFC pattern A method for surely aligning the positions is disclosed. The present applicant has proposed Japanese Patent Application No. 2003-29198 in order to realize a low profile. According to the summary of this application, an object of the present invention is to provide a connector 10 having a structure that can achieve a further narrow pitch and a low profile, and as an invention, in the connector 10 that connects the FPC 20 and the hard board 60, A bump contact 22 is provided on the contact portion 26 of the FPC 20 and a slit 24 is provided between the bump contacts 22. A bump contact 22 is provided on the contact portion 26 of the FPC 20 and two contacts 22 are paired. Further, the slit 24 is provided on the hard substrate 60, the receiving member 40 is disposed on the hard substrate 60, the bump contact 22 is disposed on the contact portion 26 of the FPC 20, and the elastic body 50 is disposed on the opposite surface side of the contact 22. And the elastic member 50 are provided, and the FPC 20 and the substrate 6 are provided by engaging the pressing member 30 with the receiving member 40. Connector structure to achieve the connection have been proposed with. In addition, the present applicant has proposed Japanese Patent Application No. 2003-119167 in order to realize a low profile. According to the summary of this application, an object of the present invention is to provide a connector 10 having a structure that can achieve a further narrow pitch and a low profile, and as an invention, in the connector 10 that connects the FPC 20 and the hard board 60, The bump contact 22 is provided on the contact portion 26 of the FPC 20 and the receiving member 40 is disposed on the hard substrate 60. The bump contact 22 is provided on the contact portion 26 of the FPC 20 and the elastic body 50 is provided on the opposite side of the contact 22. There has been proposed a connector having a structure in which the FPC 20 and the substrate 60 are connected by providing a pressing member 30 that presses the FPC 20 and the elastic body 50 and engaging the pressing member 30 with the receiving member 40.

In recent years, the demand for miniaturization such as a narrow pitch and a low profile has become stronger for connectors due to the small size of equipment.
As the pitch becomes narrower, it becomes more susceptible to the difference in height between the left and right adjacent contact portions of the contact portion. Due to the difference in height between the left and right adjacent contact portions, poor connection occurs, resulting in a narrow pitch. At the same time as the problem that can not be made, as shown in Patent Documents 1 to 4 described above, in the connection structure between the FPC using a connector and the hard board, there is a limit to the low profile of the connector, There was also a problem that it could not be reduced to 0.9 mm or less.
Conventionally, soldering has been used as a permanent connection means. However, it has been reconsidered that the solder connection can be disconnected and reconnected by reheating. Especially for ultra-compact parts, the user does not perform product maintenance, and a specialized maintenance man can use a dedicated tool etc. to easily disconnect and reconnect the solder connection part. ing.
In the connectors shown in Documents 1 and 2, the FPC is first fixed to the hard board by reflow or the like, and then the FPC is inserted into the connector to connect the FPC and the hard board. At least a housing and a contact are required. Thus, since the contact is fixed to the housing by press-fitting or the like, it is no longer possible to reduce the size such as a narrow pitch, a narrow area, or a low profile (thickness 1 mm or less). This is because the housing is an electrically insulating plastic material, and there is a limit to downsizing due to workability and strength, etc. Also, since the contact is press-fitted, the housing needs a minimum wall thickness, so it has a narrow pitch. And low profile cannot be achieved.
In the connectors shown in Documents 3 and 4, first, the receiving member is arranged (fixed) on the hard board, and then the bump contact 22 is provided on the contact portion 26 of the FPC 20, and the elastic body 50 is arranged on the opposite side of the contact. Since the pressing member 30 is engaged with the receiving member, and at least an elastic body, a pressing member, and a receiving member are required, further downsizing (0.9 mm or less) cannot be achieved. . This is because at least the thicknesses of the elastic body, the pressing member, the receiving member and the like are required.

  The present invention has been made in view of such conventional problems, and even if the pitch is narrowed, it is hardly affected by the difference in height between the left and right adjacent contact portions of the contact portion, and independent follow-up performance is achieved. Therefore, it is intended to provide a connection structure that can further reduce the height.

The purpose of the connection structure is to connect positioning means for matching the contact portion 14 of the FPC 10, 101 and the land 22 of the hard substrate 20 with the FPC 10, 101 in the connection structure for connecting the FPC 10, 101 and the hard substrate 20. A pressing member that presses against the hard substrate 20, and a pair of the contact portions 14 of the FPC 10 or the two contact portions 14 of the FPC 101 are paired so that the tips of the contact portions 14 of the FPCs 10 and 101 are integrated . A slit 12 is provided between any one of the contact portions 14 in order to make the pair or the contact portion 14 of the FPC follow, and the FPCs 10 and 101 are fixed to the pressing member 32 and fixed together. the elastic body 34 in contact with the opposite side of the contact portion 14 is disposed, the contact portion 14 of the FPC10,101 while pressing with the pressing member It can be achieved by connecting the lands 22 of the hard substrate 20 by soldering.
As the pressing means, an elastic body 34 in contact with the opposite surface side of the contact portion 14 of the FPCs 10 and 101 is disposed, and a pressing member 32 for pressing the FPCs 10 and 101 and the elastic body 34 is provided. The pressing jigs 30 and 301 to which the elastic body 34 is fixed integrally are used. The pressing jigs 30 and 301 are removed after the FPCs 10 and 101 are connected to the hard substrate 20 by soldering.
Further, a heating plate may be attached to the pressing member 32. By attaching the heating plate, the pressing jigs 30 and 301 can be used for disconnecting and reconnecting the solder connection portion during maintenance.
As the positioning means, positioning holes 16 and 26 are provided in the FPCs 10 and 101 and the hard board 20 so that the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard board 20 coincide with each other. There is also a method using a positioning jig 40 in which positioning pins 44 are arranged at positions corresponding to 16 and 26. In this case, a through hole or a stop hole is provided as a relief portion 36 of the positioning pin 44 on the pressing jig 30 side.
As another method, positioning holes 16 and 26 are provided on the FPCs 10 and 101 and the hard substrate 20 side, positioning pins 38 are provided on the pressing jig 301 side, and the positioning pins 38 are the FPCs 10 and 26, respectively. There is also a method in which the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard substrate 20 coincide with each other when the 101 and the positioning holes 16 and 26 of the hard substrate 20 are engaged. (The positioning pins 38 may be provided on the hard substrate 20 side, and the positioning holes may be provided in the FPCs 10 and 101 and the pressing jig 301.)

By taking the connection structure between the FPCs 10 and 101 and the hard substrate 20 as described above, the following remarkable effects can be obtained.
(1) In a connection structure for connecting the FPCs 10 and 101 and the hard board 20, positioning means for matching the contact portions 14 of the FPCs 10 and 101 with the lands 22 of the hard board 20 and the FPCs 10 and 101 are connected to the hard board 20. In order to make the contact between the contact portions 14 of the FPC 10 or the two contact portions 14 of the FPC 101 one pair, or to provide the follow-up property between the one pair or the contact portion 14 of the FPC. Since the slit 12 is provided between the arbitrary contact portions 14, and the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard substrate 20 are connected by soldering while being pressed by the pressing means, the FPC 10, One or a pair of contact portions 14 or any of the contact portions 14 are independent when 101 is pressed against the hard substrate 20. Can absorb the difference in height of the contact portion 14, it obtained a stable connection, has enabled low-profile position of such 0.9mm or less.
(2) The slit 12 is provided between the contact portions 14 of the FPC 10, the two contact portions 14 of the FPC 101 are paired, the slit 12 is provided between the pair of contact portions 14, and the FPC contact Since the slit 12 is provided between any of the contact portions in order to make the portion followable, the followability when the FPCs 10 and 101 are pressed against the hard substrate 20 by the pressing means is improved. It is possible to reliably connect the contact portions of the FPCs 10 and 101 to the lands of the hard substrate by soldering.
(3) Since the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard substrate 20 are connected by soldering, the solder can be easily removed and the connection can be released by reheating.
(4) Since the connection can be easily released, the FPCs 10 and 101 and the hard board 20 can be easily replaced, which does not increase the cost.
(5) As the pressing means, an elastic body 34 that is in contact with the opposite surface of the contact portion 14 of the FPCs 10 and 101 is disposed, and a pressing member 32 that presses the FPCs 10 and 101 and the elastic body 34 is provided. Since the pressing jigs 30 and 301 in which the elastic member 34 and the elastic body 34 are integrally fixed are used, the followability when pressed can be improved, and the contact portions 14 of the FPCs 10 and 101 are surely connected to the It can be soldered to the land 22 of the hard substrate 20.
(6) Since the heating plate is attached to the pressing member 32, the pressing jigs 30 and 301 can be used for disconnecting and reconnecting the solder connection part at the time of maintenance, thereby reducing the cost.

FIG. 1 is a perspective view of a pressing jig, an FPC, a hard substrate, and a positioning jig. FIG. 2 is a cross-sectional view taken along a section of the positioning pin in a state where the pressing jig, the FPC, the hard substrate, and the positioning jig are engaged. FIG. 3 is a perspective view of another FPC different from the hard substrate. FIG. 4 is a perspective view of another pressing jig for the FPC and the hard substrate. FIG. 5 is a cross-sectional view taken along a section of the positioning pin in a state where the pressing jig, the FPC, and the hard substrate of FIG. 4 are engaged.
First, the FPCs 10 and 101 and the hard board 20 are connected by soldering so that the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard board 20 coincide as shown in FIGS. In the connection structure between the FPCs 10 and 101 and the hard board 20, positioning means for matching the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard board 20 and the FPCs 10 and 101 are pressed against the hard board 20. Pressing means between the contact portions 14 of the FPC 10 or the two contact portions 14 of the FPC 101 as a pair, and the contact portion 14 of the FPC 101 or the contact portion 14 of the FPC has an arbitrary followability. A slit 12 is provided between the contact portions 14.
As described above, since the FPCs 10 and 101 and the hard board 20 are connected by soldering, the connection can be easily released by reheating.

First, the FPCs 10 and 101 will be described. The FPCs 10 and 101 are provided with contact portions 14 at predetermined positions. When the FPCs 10 and 101 are pressed against the hard substrate 20, variations in the height of the contact portions 14 can be absorbed, and A slit 12 is provided at a predetermined position in order to have followability. The slits 12 are provided between the contact portions 14 between the contact portions 14 as shown in FIG. 1 or between the two contact portions 14 as shown in FIG. Although not shown, the slits 12 may be provided between any of the contact portions 14 in order to make the contact portion 14 followable. The slits 12 may be provided anywhere as long as each of the contact portions 14 has a follow-up property. For example, the slits 12 may be provided at every third interval between the contact portions 14. The slits 12 may be provided every other one, two, one, two, one, or two of the contact portions 14.
Thus, by providing the slit 12, the contact portion 14 or the two contact portions 1 are paired, and the pair of contact portions 14 or any of the contact portions 14 become independent, and the contact Variations in the height of the portion 14 can be absorbed. (The contact portion 14 can have followability in the height direction.) The shape and size of the slit 12 are appropriately designed in consideration of such a role.
Further, in the FPCs 10 and 101, the positioning holes 16 into which the positioning pins 40 and 38 of the positioning jig 40 or the pressing jig 301 as positioning means described below are inserted are located at positions corresponding to the positioning pins 44 and 38. Is provided. The size of the positioning hole 16 is such that there is not much clearance from the pins 44 and 38 for the purpose of positioning the contact portion 14 of the FPCs 10 and 101 and the land 22 of the hard substrate 20.

As the positioning means, there is a method using a positioning jig 40 as shown in FIGS. In this method, the positioning jig 40 having two or more positioning pins 44 provided separately or integrally on the main body 42 is used, and the contact portions 14 of the FPCs 10 and 101 are arranged at positions corresponding to the positioning pins 44. Positioning holes 16 and 26 are provided in the FPCs 10 and 101 and the hard substrate 20 at positions where the lands 22 of the hard substrate 20 coincide. The pressing jig 30 is provided with an escape portion 36 for the positioning pin 44.
As another positioning means, there are methods as shown in FIGS. In this method, two or more positioning holes 16 and 26 are provided in the FPC 10 and 101 side and the hard substrate 20 so that the contact portion 14 of the FPC 10 and 101 and the land 22 of the hard substrate 20 match at the time of connection. A positioning pin 38 is provided at a position corresponding to the positioning holes 16 and 26 on the pressing means side (the pressing jig 301 side described below). The positioning pin 38 is provided integrally or separately from the pressing member 32, and the elastic body 34 is provided with a relief portion 36 of the pin 38. Further, the positioning pin 38 may be provided on the hard substrate 20 side, the positioning hole 16 may be provided in the FPCs 10 and 101, and the relief portion 36 may be provided on the pressing jig 301 side. The positions of the positioning pins 38 and 44 are appropriately designed in consideration of the contact portions 14 and pattern positions of the FPCs 10 and 101, the land 22 and pattern positions of the hard substrate 20, and the like. The positioning pins 38 and 44 may have any shape as long as the contact portion 14 of the FPCs 10 and 101 and the land 22 of the hard substrate 20 can be satisfied. A square pin may be used.
Further, as a positioning means, there is a method of reading a pattern with a CCD camera (not shown) and aligning the contact portion of the FPC with the land of the hard substrate (not shown).
As the positioning means, there is a method as described above, but any method may be used as long as the contact portions 14 of the FPCs 10 and 101 and the lands of the hard substrate 20 match at the time of soldering.

As the pressing means, pressing jigs 30 and 301 as shown in FIGS. 1 and 4 are used.
As the pressing jigs 30 and 301, an elastic body 34 that is in contact with the opposite side of the contact portion 14 of the FPCs 10 and 101 is disposed, and a pressing member 32 that presses the FPCs 10 and 101 and the elastic body 34 is provided. There is one in which the pressing member 32 and the elastic body 34 are fixed integrally.
The pressing jig 30 in the case of FIG. 1 is provided with an escape portion 36 that escapes the pin 44 at a position corresponding to the positioning pin 44 of the positioning jig 40.
The pressing jig 301 in the case of FIG. 4 has the pressing member 32 at positions corresponding to the FPCs 10 and 101 and the positioning holes 16 and 26 of the hard substrate 20 in order to have a function as positioning as described above. A positioning pin 38 is provided integrally or separately.

The elastic body 34 absorbs the pressing reaction force so that the FPCs 10 and 101 are not damaged by the pressing reaction force when the contact portion 14 of the FPCs 10 and 101 is pressed against the land 22 of the hard substrate 20. It is. Therefore, examples of the material of the elastic body 34 include silicon rubber having heat resistance equal to or higher than the melting point of solder. The size of the elastic body 34 is appropriately designed in consideration of the above role and the handleability of the pressing jigs 30 and 301. It is sufficient if it is within a range that can cover the contact portion 14 of the FPCs 10 and 101, and a thickness of about 0.3 to 0.5 mm is sufficient if the pressing reaction force can be absorbed.
In the case of the elastic body 34 used in the pressing jig 301 in FIG. 4, a relief portion 36 of the positioning pin 38 provided in the pressing member 32 is provided.
The shape of the relief portion 36 in FIGS. 1 and 4 may be any shape as long as the positioning pins 38 and 44 can escape, such as a hole (through hole or stop hole), a groove such as a recess, etc. as in this embodiment. But you can.

The pressing member 32 has a substantially plate shape, and is made of metal. Although not shown, the heating member is in contact with or embedded in the heating member 32 and is made of a material having heat transfer properties. . As described above, the heating member is brought into contact with or embedded in the pressing member 32, so that it can be used not only as the pressing jigs 30 and 301 but also for disconnecting and reconnecting the solder connection portion during maintenance. Any heating element may be used as long as it generates a temperature higher than the melting point of the solder.
The pressing member 32 is for pressing the FPCs 10 and 101 against the hard substrate 20 and is provided with a pressing part (not shown) for pressing the elastic body 34 (and thus the FPCs 10 and 101). The pressing portion is appropriately designed so that the FPCs 10 and 101 can be pressed against the hard substrate 20 and can be easily pressed.
The pressing jig 30 in the case of FIG. 1 is provided with an escape portion 36 for escaping the pin 44 at a position corresponding to the positioning pin 44 of the positioning jig 40. The pressing jig 301 in the case of FIG. In order to provide a function for positioning as described above, positioning pins 38 are provided integrally or separately from the pressing member 32 at positions corresponding to the positioning holes 16 and 26 of the FPCs 10 and 101 and the hard substrate 20. ing.

  As shown in FIGS. 1, 3 and 4, the hard substrate 20 is provided with lands 22 at predetermined positions according to customer specifications and the like. The contact portions 14 of the FPCs 10 and 101 are connected to the lands 22 by soldering. The hard substrate 20 is provided with a positioning hole 26 into which the positioning pins 44 and 38 of the positioning jig 40 or the pressing jig 301 serving as positioning means are inserted, at positions corresponding to the positioning pins 44 and 38. Yes. The size of the positioning hole 26 is such that there is not much clearance from the pins 44 and 38 for the purpose of positioning the contact portion 14 of the FPCs 10 and 101 and the land 22 of the hard substrate 20.

Finally, a connection method between the FPCs 10 and 101 and the hard substrate 20 will be described.
First, the case of FIG. 1 will be described.
First, the positioning hole 26 of the hard substrate 20 is inserted into the positioning pin 44 provided in the positioning jig 40 as positioning means in the direction of the arrow “A” in FIG.
Next, with the hard substrate 20 mounted on the positioning jig 40, the positioning holes 16 of the FPCs 10 and 101 are inserted into the positioning pins 44 in the direction of the arrow “B”.
Next, in a state where the hard substrate 20 and the FPCs 10 and 101 are attached to the positioning jig 40, the FPC 10 101 is pressed.
Finally, the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard substrate 20 are matched and the FPCs 10 and 101 are pressed, and the FPCs 10 and 101 are connected to the hard substrate 20 by soldering.

Second, the case of FIG. 4 will be described.
First, the positioning holes 16 of the FPCs 10 and 101 are inserted into the positioning pins 38 provided in the pressing jig 301 serving as positioning means.
Next, the positioning hole 26 of the hard substrate 20 is inserted into the positioning pin 38 in a state where the FPCs 10 and 101 are mounted on the pressing jig 301.
Finally, the contact portions 14 of the FPCs 10 and 101 and the lands 22 of the hard substrate 20 are matched and the FPCs 10 and 101 are pressed, and the FPCs 10 and 101 are connected to the hard substrate 20 by soldering.

  As an application example of the present invention, it is used for connecting an FPC used in a mobile phone, a notebook personal computer, a digital camera, and the like to a hard substrate, and a connection pitch is narrowed and a low profile is achieved.

It is a perspective view of a pressing jig, an FPC, a hard substrate, and a positioning jig. FIG. 6 is a cross-sectional view taken along a section of a positioning pin in a state where a pressing jig, an FPC, a hard substrate, and a positioning jig are engaged. It is a perspective view of another FPC from a hard substrate. It is a perspective view of FPC, a hard substrate, and another pressing jig. FIG. 5 is a cross-sectional view taken along a portion of a positioning pin in a state where a pressing jig, an FPC, and a hard substrate in FIG. 4 are engaged.

10,101 FPC (Flexible Printed Circuit Board)
12 Slit 14 Contact portion 16, 26 Positioning hole 20 Hard substrate 22 Land 30, 301 Press jig 32 Press member 34 Elastic body 36 Escape portion 38, 44 Positioning pin 40 Positioning jig 42 Main body

Claims (4)

In the connection structure that connects the flexible printed circuit board (FPC) and the hard circuit board,
Positioning means for matching the contact portion of the flexible printed circuit board and the land of the hard circuit board, and a pressing member that presses the flexible printed circuit board to the hard circuit board,
A slit is provided between the contact parts of the flexible printed circuit board so that the contact part side tip of the flexible printed circuit board is integrated ,
An elastic body that is integrally fixed to the pressing member and is in contact with the opposite surface side of the contact portion of the flexible printed circuit board is disposed,
Connection structure between the flexible printed circuit board and the hard substrate, characterized in that the connection by soldering and the land of the hard substrate and the contact portion of the pressing member the flexible printed circuit board while being pressed in. In the connection structure that connects the flexible printed circuit board (FPC) and the hard circuit board,
Positioning means for matching the contact portion of the flexible printed circuit board and the land of the hard circuit board, and a pressing member that presses the flexible printed circuit board to the hard circuit board,
A pair of two contact portions of the flexible printed circuit board is provided, and a slit is provided between the pair so that the front end of the contact portion of the flexible printed circuit board is integrated .
An elastic body that is integrally fixed to the pressing member and is in contact with the opposite surface side of the contact portion of the flexible printed circuit board is disposed,
Connection structure between the flexible printed circuit board and the hard substrate, characterized in that the connection by soldering and the land of the hard substrate and the contact portion of the pressing member the flexible printed circuit board while being pressed in. In the connection structure that connects the flexible printed circuit board (FPC) and the hard circuit board,
Positioning means for matching the contact portion of the flexible printed circuit board and the land of the hard circuit board, and a pressing member that presses the flexible printed circuit board to the hard circuit board,
In order to give the contact part of the flexible printed circuit board so that the contact part side tip of the flexible printed circuit board is integrated, a slit is provided between any of the contact parts,
An elastic body that is integrally fixed to the pressing member and is in contact with the opposite surface side of the contact portion of the flexible printed circuit board is disposed,
Connection structure between the flexible printed circuit board and the hard substrate, characterized in that the connection by soldering and the land of the hard substrate and the contact portion of the pressing member the flexible printed circuit board while being pressed in. 4. A pressing jig used for a connection structure between a flexible printed board and a hard board according to claim 1, wherein a heating plate is attached to the pressing member.

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