JP2007335421A - Connection structure of circuit board and manufacturing method of circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a circuit board which can efficiently utilize a board area and is excellent in workability of inspection. <P>SOLUTION: A plurality of terminals 17 are juxtaposed and provided on the surface of a printed board 12. A plurality of terminals 21 matched with the terminals 17 on the printed board 12 are juxtaposed and provided on the surface of a TCP 13. Both types of terminals 17, 21 are mutually connected in a state of superposition. An index side edge portion 22 formed so that its one part is shifted from the other by a predetermined dimension along the arrangement direction of the terminals 21 is provided on a side edge portion in the terminals 21 of the TCP 13. The shift quantity between the terminals 17 and 21 can be confirmed while using the index side edge portion 22 as a guide. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a circuit board connection structure and a circuit board manufacturing method.

  For example, in a liquid crystal display device such as a liquid crystal television, a TCP (Tape Carrier Package) is used to connect a liquid crystal panel to a printed board. This TCP is roughly structured to mount a driver such as LSI on a flexible heat-resistant film and resin-sealed. A conductive pattern having a predetermined pattern is formed on the surface of the film. It is formed in a state where terminals are arranged at both ends. These terminal groups are connected to terminals on the liquid crystal panel side and terminals on the printed circuit board via, for example, an ACF (Anisotropic Conductive Film). The operation of connecting the printed circuit board and the TCP by this ACF is performed as follows.

  First, a tape-shaped ACF is attached to the portion of the printed circuit board where the terminals are formed, and a TCP is placed on the ACF and heat-pressed in a state where the terminals are aligned with each other. It is electrically connected by conductive particles.

  After performing the connection work as described above, a visual inspection using a magnifying glass or the like is performed in order to inspect whether or not the connection is properly made. In this visual inspection, for example, whether or not both terminals are connected in a state where they are displaced in the width direction is visually inspected, and the connection is made such that the amount of positional deviation exceeds the allowable range. For those that are determined to be inappropriate, the crimping operation is repeated.

  As the prior art relating to such visual inspection, those described in Patent Documents 1 and 2 below are known. Among them, the one described in Patent Document 1 forms marks on the liquid crystal panel and the TCP film, and visually inspects whether the marks are aligned with each other when both are aligned or after crimping. It is what I did.

On the other hand, in Patent Document 2, the width dimension of the terminal on the printed circuit board is set larger than the width dimension of the terminal on the TCP side. In addition, the range where both terminals do not overlap is widened by the difference in the width dimension of both terminals, and the shift can be easily visually recognized.
Japanese Patent Laid-Open No. 2002-9412 JP 2004-87938 A

  However, the methods described in Patent Documents 1 and 2 have the following problems. That is, in the method described in Patent Document 1, since it is necessary to print a mark on a liquid crystal panel or a printed board, it is necessary to add the printing process during the manufacturing process. There is a problem that it is necessary to secure a space for forming the film.

  Moreover, in the method described in Patent Document 2, although the range where both terminals do not overlap can be increased, it is still difficult to understand how much the positional deviation between both terminals is, and it is left to the discretion of the operator. Was the current situation. Accordingly, there is a high possibility that an inspection error will occur, and it is difficult to determine the amount of misalignment, so the workability is not good.

  The present invention has been completed based on the above circumstances.

  As a means for achieving the above object, a circuit board connection structure according to the invention of claim 1 includes a first circuit board having a plurality of terminals arranged on the surface, and the terminals of the first circuit board. In the circuit board connection structure in which a plurality of terminals that match each other are connected to each other in a state in which the corresponding terminals of both circuit boards are overlapped with each other, the first and second circuit boards are connected to each other. The side edge of the terminal of one of the circuit boards is provided with an indicator side edge formed by shifting a part thereof from the other by a predetermined dimension along the arrangement direction of the terminal group. It has the characteristics in the configuration.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the indicator side edge is provided by forming a notch in the side edge of the terminal.

  A third aspect of the invention is characterized in that, in the second aspect of the invention, the indicator side edge portion is formed with a size that is ½ of the width dimension of the terminal.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the recesses are provided so as to form a pair on both side edges of the terminal and to be displaced along the longitudinal direction of the terminal. It is characterized in that a portion farthest from the side edge is formed so as to be positioned on a straight line parallel to the side edge of both the concave portions forming a pair.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the indicator side edge portion is formed at a tip end portion of the terminal.

  According to a sixth aspect of the present invention, in the apparatus according to any one of the first to fifth aspects, the indicator side edge portion is provided on a side edge portion on both sides along the arrangement direction of the terminals. Has characteristics.

  According to a seventh aspect of the present invention, there is provided a circuit board manufacturing method comprising: a first circuit board having a plurality of terminals arranged on the surface; and a plurality of terminals aligned with the terminals of the first circuit board arranged on the surface. A method of manufacturing a circuit board that is connected to a second circuit board in a state where corresponding terminals of both circuit boards are overlapped with each other, and one of the first and second circuit boards A terminal forming step of forming a terminal having a shape in which a part of the side edge portion of the terminal is recessed from or protrudes from another portion, and a shape having an indicator side edge portion protruding from the other portion, and a terminal formed on the other side of the circuit board An alignment process for aligning the terminals of one circuit board with respect to each other, a connection process for connecting the two terminals to each other, and an inspection process for inspecting the deviation state of the both terminals connected by visually observing the index side edge It has the feature in performing.

  The invention according to claim 8 is the light-transmitting film substrate according to claim 7, wherein at least one of the circuit boards is a light-transmitting film substrate in which a conductive path having a predetermined pattern is formed on the surface of the light-transmitting film. The inspection process is characterized in that it is performed by visual observation from the translucent film substrate side.

<Invention of Claims 1 and 7>
The shift amount between the terminals can be confirmed using the index side edge as a guide. Therefore, it is possible to easily determine whether or not the deviation amount is within an allowable range in the inspection, and the workability is also good. In addition, since the terminal itself is used as an index, it is not necessary to add a printing process as compared with a case where a confirmation mark (index) is separately provided by printing or the like, and the board area can be effectively utilized.

<Invention of Claim 2>
Even if the terminal side edge portion is provided on the terminal, the original width dimension of the terminal does not change, and therefore it can be applied to a terminal group having a narrow pitch.

<Invention of Claim 3>
A positional shift can be detected regardless of which direction is shifted in either direction at one index side edge.

<Invention of Claim 4>
When the amount of positional deviation exceeds the allowable range, changes appear in both index side edges, so that visual confirmation becomes easier.

<Invention of Claim 5>
Since the position of the index side edge is easy to find, it is easy to check.

<Invention of Claim 6>
Can deal with misalignment in both directions.

<Invention of Claim 8>
The deviation of both terminals can be inspected by visually observing the indicator side edge through the translucent film.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the case where the printed circuit board 12 used for the liquid crystal display device 10 and TCP13 (Tape Carrier Package) are connected is illustrated.

  As shown in FIG. 1, the liquid crystal display device 10 roughly includes a liquid crystal panel 11 using TFTs as switching elements, a printed circuit board 12 on which electrical components and the like are mounted, and the liquid crystal panel 11 and the printed circuit board 12. TCP 13 for connecting to each other. The liquid crystal panel 11 has a configuration in which a liquid crystal layer is sandwiched between a pair of glass substrates that are supported in parallel while facing each other with a predetermined gap therebetween. A pair of polarizing plates is attached to the surfaces of both glass substrates opposite to the liquid crystal layer.

  Among both glass substrates, on the surface of one glass substrate on the liquid crystal layer side, a large number of pixel electrodes connected to the drain electrode of the TFT are arranged in parallel with the TFT in a matrix, and the source electrode of the TFT The connected source wiring and the gate wiring connected to the gate electrode of the TFT are provided so as to be orthogonal to each other while passing around each pixel electrode. On the other glass substrate, R, G, B color filter layers and counter electrodes are formed.

  A terminal group connected to the source wiring is arranged in parallel at the upper end portion in the figure of the glass substrate provided with TFTs, and a terminal group connected to the gate wiring is arranged in parallel at the left and right end parts in the drawing. The TCP 13 is connected to each terminal group arrangement region.

  As shown in FIG. 2, a conductive path 14 is formed in a predetermined pattern on the surface of the printed circuit board 12, and an electrical component 15 such as a resistor, a diode or a capacitor is mounted thereon, and another control board (not shown). A connector 16 is provided for connection. A large number of terminals 17 connected to the conductive path are arranged in parallel at the end of the printed circuit board 12 on the liquid crystal panel 11 side (specifically, a position slightly retracted from the tip position). On the other hand, TCP 13 is connected. Each terminal is made of copper foil laminated on the surface of the printed circuit board 12, and is arranged side by side in a state of being parallel and spaced apart from each other. The width dimension thereof is, for example, about 0.22 mm. Is done.

  As shown in FIG. 3, the TCP 13 has a structure in which a driver 19 such as an LSI chip is mounted on the surface of a film 18 having excellent heat resistance, and this is resin-sealed. The film 18 is formed in a flexible thin film having translucency, and a conductive path 20 connected to the driver 19 is formed in a predetermined pattern on the surface thereof.

  A large number of terminals 21 connected to the conductive path 20 are arranged in parallel at both ends of the film 18 across the driver 19. A group of terminals 21 arranged at one end of the TCP 13 is a group of terminals 17 of the printed circuit board 12 and a group of terminals 21 arranged at the other end is an ACF (Anisotropic Conductive Film): The printed circuit board 12 and the liquid crystal panel 11 are electrically connected to each other through the TCP 13. In FIG. 3, the liquid crystal panel terminals in the TCP 13 are not shown.

  The terminals 21 of the TCP 13 are configured such that the surface of the copper foil laminated on the surface of the film 18 is tin-plated, and are arranged side by side in parallel with each other at a predetermined interval. The two terminals 21 are arranged in alignment with the terminals 17 of the printed circuit board 12 and the terminals of the liquid crystal panel 11, that is, the pitch of the terminals 21 corresponds to the pitch of the terminals 17 of the corresponding printed circuit board 12 and the terminals of the liquid crystal panel 11. It is set to be almost the same as the pitch. Among the terminals 21 of the TCP 13, each terminal 21 connected to the printed circuit board 12 is set to have a width dimension smaller than that of the terminal 17 on the printed circuit board 12 side, and the size thereof is, for example, about 0.18 mm. .

  As shown in FIG. 3, each terminal 21 for the printed circuit board 12 in the TCP 13 is an index that serves as an index (reference) when visually inspecting a deviation that may occur between the terminal 17 of the printed circuit board 12 at the time of connection. A side edge 22 is provided. The indicator side edge portion 22 is a form in which the side edge portion of the terminal 21 is partially recessed, specifically, a substantially trapezoidal concave portion is formed in the side edge portion of the terminal 21, and the left and right side edge portions of each terminal 21 are formed. A pair is provided. In other words, the indicator side edge portion 22 is formed such that a part of the side edge portion of the terminal 21 is shifted from the other portion by a predetermined dimension along the width direction (terminal group arrangement direction).

  Both index side edge portions 22 are arranged at a midway position in the longitudinal direction of the terminal 21, and are arranged at positions shifted left and right in the drawing along the longitudinal direction of the terminal 21. The peripheral edge of each indicator side edge portion 22 includes a parallel portion 22 a along the side edge 21 a of the terminal 21, and a portion that is inclined and connects the parallel portion 22 a to the side edge 21 a of the terminal 21. Of these, the parallel portion 22 a is the portion of the peripheral edge of the indicator side edge portion 22 that is farthest from the side edge 21 a of the terminal 21. The recess width of both index side edge portions 22 is set to about ½ of the width dimension of the terminal 21 of the TCP 13, and the parallel portions 22 a on the peripheral edge are both arranged at the center position in the width direction of the terminal 21, and are straight. There is no. That is, the parallel portions 22 a of the paired index side edge portions 22 are located on a straight line parallel to the side edge 21 a of the terminal 21.

  Next, a work procedure related to the connection between the printed circuit board 12 and the TCP 13 will be described. The connection work between the printed circuit board 12 and the TCP 13 includes a process for manufacturing the printed circuit board 12 and the TCP 13 (including a terminal forming process for forming the terminal 21 having the index side edge 22 on the TCP 13), and attaching an ACF to the printed circuit board 12. ACF attaching step for attaching, positioning step for aligning the terminal 17 of the printed circuit board 12 and the terminal 21 of the TCP 13, a connecting step for connecting the overlapped terminals 17, 21, and the connected terminals 17, 21 This is performed through an inspection process for inspecting the deviation state.

  The TCP 13 obtained through the manufacturing process is connected to the liquid crystal panel 11 first. The liquid crystal panel 11 with TCP and the printed circuit board 12 are set in a thermocompression bonding apparatus (not shown). Then, a tape-shaped ACF is attached along the terminals 17 formed on the printed circuit board 12 and temporarily pressure-bonded from above the ACF separator. Thereafter, the ACF separator is peeled off, and then the end portion of the TCP 13 is placed on the ACF, and the terminal group 21 of the TCP 13 is aligned with the terminal group 17 of the printed circuit board 12. Subsequently, the TCP 13 is covered with a cushioning material, and heat-pressed with a crimping tool from above, whereby the TCP 13 is fixed to the printed circuit board 12 and only the terminals 17 and 21 facing each other are vertically overlapped with each other. The conductive particles are electrically connected. These operations are automatically performed by a thermocompression bonding apparatus.

  When the connection process is completed as described above, the process proceeds to an inspection process for visually inspecting whether or not the connection is properly performed using a magnifying glass. In this inspection process, whether or not the terminals 17 and 21 are connected in a state of being displaced in the width direction, and if they are displaced, the amount of displacement (from the side edge 17a of the terminal 17 of the printed circuit board 12 to the TCP 13 It is inspected whether or not the amount of protrusion of the terminal 21 is within an allowable range. As a result, if it is determined that the connection is improper, it is sent to the repair process and the crimping operation is performed again.

  The allowable displacement in the width direction of both terminals 17 and 21 is set to be half the width of the terminal 21 of the TCP 13, that is, the same size as the recess width of the index side edge 22. . The reference value of the allowable displacement is set so that the connection resistance value between the terminals 17 and 21 does not exceed a predetermined value. The TCP 13 is formed of a light-transmitting film 18 so that the terminal 17 of the printed circuit board 12 covered with the film 18 can be seen from above.

  For example, when both the terminals 17 and 21 are connected without being displaced, as shown in FIG. 4, the terminal 21 of the TCP 13 is located on the inner side of the both side edges 17 a of the terminal 17 of the printed circuit board 12. Then, the terminals 17 of the printed circuit board 12 are respectively visually recognized. In this case, it is determined that both terminals 17 and 21 are properly connected.

  Next, the case where both terminals 17 and 21 are connected in a misaligned state will be described. In this description, the case where the terminal 21 of the TCP 13 is connected to the terminal 17 of the printed circuit board 12 with the position shifted to the left in the figure is illustrated, but the same inspection can be performed even when the terminal 21 is displaced to the right. Needless to say.

  When the amount of positional deviation between the terminals 17 and 21 is within an allowable range, that is, smaller than ½ of the width dimension of the terminal 21 of the TCP 13, the terminal 21 of the TCP 13 is replaced with the terminal 17 of the printed circuit board 12 as shown in FIG. And the left side edge 17a of the printed circuit board 12 and the left side edge 17a of the terminal 17 of the printed circuit board 12 are visually recognized on the left side edge 17a. The terminal 22 of the printed circuit board 12 is visually recognized in the part 22. That is, the terminal 17 of the printed circuit board 12 is located between the parallel portion 22a on the peripheral edge of the index side edge 22 on the side (left side) where the terminal 21 of the TCP 13 is shifted and the side edge 17a of the terminal 17 of the printed circuit board 12. Visible. In this case, although both terminals 17 and 21 are connected in a state of being displaced in the width direction, the amount of displacement is within an allowable range, so it is determined that the connection has been made appropriately.

  Then, when the positional deviation amount of both the terminals 17 and 21 exceeds the allowable range, that is, when the positional deviation amount is larger than ½ of the width dimension of the terminal 21 of the TCP 13, as shown in FIG. While the terminal 21 of the TCP 13 protrudes from the left side edge 17a of the terminal 17 of the printed circuit board 12, the terminal 17 of the printed circuit board 12 is not visually recognized at the left index side edge portion 22, and the surface 12a of the printed circuit board 12 is visually recognized. In addition, the left side edge 17 a of the terminal 17 of the printed circuit board 12 and the surface 12 a of the printed circuit board 12 are visually recognized on the right index side edge portion 22. That is, only the surface 12a of the printed circuit board 12 is visually recognized at the index side edge 22 on the side where the terminal 21 of the TCP 13 is shifted, and the parallel portion 22a at the periphery of the index side edge 22 on the opposite side, and the printed circuit board. Between the side edges 17a of the 12 terminals 17, not the terminals 17 of the printed circuit board 12 but the surface 12 a of the printed circuit board 12 is visible.

  As described above, the side edge 17a of the terminal 17 that should be visually recognized if the allowable amount of displacement is within the allowable range is not visually recognized at the left index side edge 22 and is not visually recognized at the right index side edge 22. The side edge 17a of the expected terminal 17 can be visually recognized, that is, a change appears in both the indicator side edge portions 22, and in this case, it is determined that the connection state of both the terminals 17 and 21 is inappropriate. .

  As described above, when the amount of positional deviation between the terminals 17 and 21 is within the allowable range and when it exceeds the allowable range, the difference can be recognized at a glance if the indicator side edge portion 22 is visually observed. Therefore, since it does not depend on the operator's discretion when determining the amount of misalignment, there is no variation in the determination result, and the determination can be made quickly, so that the workability is also good. It becomes. Thereby, it is possible to accurately and easily detect whether or not the amount of positional deviation in the width direction of both terminals 17 and 21 is within an allowable range. Moreover, since the terminal 21 itself is used as an index, it is not necessary to add a printing process and the board area is effective compared to the case where a separate confirmation mark is provided on the TCP 13 or the printed board 12 by printing or the like. Can be used.

  In addition, since the indicator side edge portion 22 is provided by forming a recess in the side edge portion of the terminal 17, the terminal 21 does not increase in size as the indicator side edge portion 22 is provided. 21 can be kept at the original width dimension, and is suitable for a group of terminals 21 having a narrow pitch.

  Furthermore, since the indicator side edge portion 22 is provided on the side edge portions on both sides of the terminal 21, it is possible to cope with a positional shift in both the left and right directions.

  The indicator side edge portion 22 (concave portion) is provided so as to form a pair on both side edge portions of the terminal 21 and be displaced along the longitudinal direction of the terminal 21, and the indicator side edge portion 22 of the pair of indicator side edge portions 22 is formed. Since the parallel part 22a, which is the part farthest from the side edge 21a, is formed so as to be positioned on a straight line parallel to the side edge 21a, when the amount of positional deviation exceeds the allowable range, both index side edges A change appears at 22, which makes it easier to check visually.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the arrangement position of the indicator side edge portion 22A is changed. In the second embodiment, redundant description of the same structure, operation, and effects as those in the first embodiment will be omitted.

  Of the two index side edges 22A, the left index side edge 22A is arranged at the tip of the left side edge of the terminal 21 of the TCP 13, as shown in FIG. That is, the indicator side edge 22A is formed in such a manner that it opens in the direction in which the terminals 21 are arranged (leftward in the figure) and also in the length direction of the terminals 21 (backward in the figure). On the other hand, the right index side edge portion 22A is arranged at a position shifted toward the front side in the figure in the length direction of the terminal 21, and is configured to open only in the arrangement direction (right side in the figure) of the terminals 21.

  Since the indicator side edge 22A is formed at the tip of the terminal 21 as described above, even if the terminal 21 is misaligned as shown in FIGS. The portion 22A is easy to find, and therefore the workability is good.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, only one index side edge 22B is provided. In the third embodiment, the description of the same structure, operation, and effect as in the first embodiment is omitted.

  One indicator side edge 22B is provided on the right side edge of the terminal 21, as shown in FIG. The index side edge portion 22B has a recess width set to about ½ of the width dimension of the terminal 21 of the TCP 13. Of the peripheral edge of the indicator side edge 22B, a portion 22Ba (a portion farthest from the side edge 21a of the terminal 21) parallel to the side edge 21a of the terminal 21 is disposed at the center in the width direction of the terminal 21.

  First, the case where the terminal 21 of the TCP 13 is displaced to the left with respect to the terminal 17 of the printed circuit board 12 will be described. When the amount of positional deviation is within the allowable range, as shown in FIG. 11A, the surface of the terminal 17 is visually recognized at the index side edge 22B, but the amount of positional deviation exceeds the allowable range. 11B, the left side edge 17a of the terminal 17 and the surface 12a of the printed circuit board 12 are visually recognized at the indicator side edge 22B.

  Next, a case where the terminal 21 of the TCP 13 is displaced to the right side in the figure with respect to the terminal 17 of the printed circuit board 12 will be described. When the positional deviation amount is within the allowable range, as shown in FIG. 12A, the right side edge 17a of the terminal 17 is visually recognized at the indicator side edge portion 22B, whereas the positional deviation amount is within the allowable range. 12B, the surface 12a of the printed circuit board 12 is visible without the right side edge 17a of the terminal 17 being visible at the indicator side edge 22B, as shown in FIG.

  In this way, even if the terminal 21 is displaced in both the left and right directions, if the amount of displacement exceeds the allowable range, a change appears on the indicator side edge 22B. Accordingly, by visually observing one index side edge 22B, it is possible to detect the amount of misalignment regardless of whether the terminal 21 is misaligned in both the left and right directions. Since only one indicator side edge 22B is required, the installation space for the indicator side edge 22B is minimized. In this embodiment, the case where the terminal 21 is provided on the right side edge portion of the terminal 21 is shown. However, the terminal 21 may be provided on the left side edge portion. Can do.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. 13 or FIG. In the fourth embodiment, an index side edge 22C is provided on the terminal 17 on the printed circuit board 12 side. In the fourth embodiment, redundant description of the same structure, operation, and effect as in the first embodiment will be omitted.

  As shown in FIG. 13, a pair of index side edge portions 22 </ b> C is provided on both side edge portions of the terminal 17 of the printed circuit board 12. The recess widths of both index side edge portions 22C are set to about ½ of the width dimension of the terminal 17 of the printed circuit board 12. Of the peripheral edges of both indicator side edges 22C, a portion 22Ca parallel to the side edge 17a of the terminal 17 (a portion farthest from the side edge 17a of the terminal 17) is both at the center position in the width direction of the terminal 17 and the terminal 17 It is arranged on a straight line along the side edge 17a.

  The allowable amount of displacement in the width direction of both terminals 17 and 21 is a size (0.07 mm) obtained by subtracting 1/2 of the width dimension of the terminal 17 of the printed circuit board 12 from the width dimension of the terminal 21 of the TCP 13. It is set to a little less than 2/5 of the width dimension of 21. When the terminal 21 of the TCP 13 is displaced to the left with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within an allowable range, as shown in FIG. The entire side of the side edge portion 22C is covered with the terminal 21, and the right side edge 21a of the terminal 21 is visually recognized on the right index side edge portion 22C. On the other hand, if the amount of displacement exceeds the allowable range, the left side edge 21a of the terminal 21 and the surface 12a of the printed circuit board 12 are present on the left index side edge 22C as shown in FIG. The side edge 21a of the terminal 21 is not visually recognized on the index side edge 22C on the right side, and the surface 12a of the printed circuit board 12 is visually recognized. As described above, when the amount of positional deviation exceeds the allowable range, a change occurs in both index side edge portions 22C, so that the amount of positional deviation of the terminals 17 and 21 can be easily detected.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. 15 or FIG. In the fifth embodiment, a projection is provided on the terminal 21 of the TCP 13 as the index side edge 22D. In the fifth embodiment, redundant description of the same structure, operation, and effects as those of the first embodiment will be omitted.

  As shown in FIG. 15, a pair of index side edge portions 22 </ b> D protruding in the lateral direction is provided at both side edge portions of the terminal 21 of the TCP 13. Both index side edge portions 22 </ b> D are arranged so as to be shifted to the back side and the near side along the longitudinal direction of the terminal 21. The dimension (projection amount) by which both index side edge portions 22D project from the side edge 21a of the terminal 21 is about 1/4 of the width dimension of the terminal 21, and the difference between the width dimensions of both terminals 17, 21 is large. The added size (0.085 mm).

  The allowable amount of displacement in the width direction of both terminals 17 and 21 is set to ¼ of the width dimension of the terminal 21 of the TCP 13. When the terminal 21 of the TCP 13 is displaced to the left with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within the allowable range, as shown in FIG. A side edge 22Da (protruding end edge) of the side edge 22D protrudes to the right side of the right side edge 17a of the terminal 17, and the right side edge 17a of the terminal 17 is hidden by the right index side edge 22D and is not visually recognized. . On the other hand, when the amount of displacement exceeds the allowable range, the side edge 22Da of the right index side edge 22D is arranged on the left side of the right side edge 17a of the terminal 17, as shown in FIG. Then, the right side edge 17 of the terminal 17 is visually recognized. Thereby, the amount of positional deviation of the terminal 21 can be detected. Even when the terminal 21 is displaced to the right side, the amount of displacement can be detected by visually observing the left index side edge 22D as described above.

<Embodiment 6>
A sixth embodiment of the present invention will be described with reference to FIGS. In the sixth embodiment, a case where four index side edge portions 22E and 22F are provided in one terminal 21 is shown. In the sixth embodiment, redundant description of the same structure, operation, and effect as in the first embodiment will be omitted.

  As shown in FIG. 17, two sets of index side edge portions 22 </ b> E and 22 </ b> F that form a pair are provided on both side edge portions of the terminal 21 of the TCP 13. Each indicator side edge 22E, 22F is formed in a form in which the side edge of the terminal 21 is recessed. Specifically, the side edge portion of the index for detecting the amount of displacement when the terminal 21 of the TCP 13 is displaced to the left side with respect to the terminal 17 of the printed circuit board 12 on the far side in the drawing of both side edge portions of the terminal 21. 22E is provided in a pair, and on the front side in the figure, an index side edge portion 22F for detecting a displacement amount when the terminal 21 is displaced to the right side is provided in a pair.

  The index side edge 22E of the rear side set in the figure is provided on the left side edge of the terminal 21, and the recess width is 1/4 of the width of the terminal 21. The index side edge 22ER is provided on the right side edge and has a dent width of 3/4 of the width of the terminal 21. The portions 22ELa and 22ERa, which are the farthest from the side edge 21a of the terminal 21 among the peripheral edges of the paired indicator side edge portions 22E, are arranged at positions shifted to the left from the center position of the terminal 21, and both It arrange | positions on the same straight line parallel to the side edge 21a.

  On the other hand, the index side edge portion 22F of the set on the near side of the figure is provided on the left side edge portion of the terminal 21, and the recess width is 3/4 of the width dimension of the terminal 21. The index side edge portion 22FR is provided at the side edge portion on the right side of 21 and has a dent width that is 1/4 of the width dimension of the terminal 21. The portions 22FLa and 22FRa farthest from the side edge 21a of the terminal 21 among the peripheral edges of the indicator side edge portions 22F forming a pair are arranged at positions shifted to the right side from the center position of the terminal 21, and both It arrange | positions on the same straight line parallel to the side edge 21a.

  The allowable amount of displacement in the width direction of both terminals 17 and 21 is set to ¼ of the width dimension of the terminal 21 of the TCP 13. When the terminal 21 of the TCP 13 is displaced to the left side with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within an allowable range, as shown in FIG. In the pair of index side edges 22E, the left side edge 17a of the terminal 17 is visually recognized by the left index side edge 22EL, and the surface of the terminal 17 is visually recognized by the right index side edge 22ER. When the amount of displacement exceeds the allowable range, as shown in FIG. 18B, the left side index side edge 22EL of the back side index side edge 22E has a side edge 17a of the terminal 17. The surface 12a of the substrate 12 is visually recognized without being visually recognized, and the left side edge 17a of the terminal 17 is visually recognized at the right index side edge 22ER.

  On the other hand, when the terminal 21 of the TCP 13 is displaced to the right side with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within an allowable range, as shown in FIG. The right side edge 17a of the terminal 17 is visually recognized by the right side index side edge 22FR, and the surface of the terminal 17 is visually recognized by the left side index side edge 22FL. When the amount of displacement exceeds the allowable range, as shown in FIG. 19B, the side edge 17a of the terminal 17 is located on the right side index side edge 22FR of the front side index side edge 22F. The surface 12a of the substrate 12 is visually recognized without being visually recognized, and the right side edge 17a of the terminal 17 is visually recognized at the left index side edge 22FL.

  As described above, when the terminal 21 is shifted to the left side, the rear side index side edge portion 22E is observed. When the terminal 21 is shifted to the right side, the front side index side edge portion 22F is visually observed. The amount of displacement of the terminal 21 can be detected. If the amount of positional deviation exceeds the allowable range, a change occurs in the paired indicator side edge portions 22E and 22F, so that the positional deviation amount of the terminal 21 can be easily detected.

<Embodiment 7>
A seventh embodiment of the present invention will be described with reference to FIGS. In the seventh embodiment, the terminal 21 is provided with a concave portion and a convex portion as the indicator side edge portions 22G and 22H. In the seventh embodiment, redundant description of the same structure, operation, and effects as those of the first embodiment will be omitted.

  As shown in FIG. 20, two sets of index side edge portions 22G and 22H that make a pair, a total of four, are provided on both side edge portions of the terminal 21 of the TCP 13. The index side edge portion 22G for detecting the amount of displacement when the terminal 21 of the TCP 13 is displaced to the left side with respect to the terminal 17 of the printed circuit board 12 is paired on the far side in the drawing in the both side edges of the terminal 21. An index side edge 22H for detecting the amount of displacement when the terminal 21 is displaced to the right side is provided in a pair on the front side of the figure.

  The indicator side edge portion 22G of the set on the back side in the figure is a shape that protrudes laterally to the indicator side edge portion 22GL formed in a shape recessed in the left side edge portion of the terminal 21 and the right side edge portion of the terminal 21. And the indicator side edge portion 22GR formed by The recess width of the left index side edge portion 22GL is ¼ of the width dimension of the terminal 21, and the protruding amount of the right index side edge portion 22GR is approximately ¼ of the width dimension of the terminal 21. Furthermore, the size (0.085 mm) is obtained by adding the difference in width between the terminals 17 and 21.

  On the other hand, the indicator side edge portion 22H of the set on the far side in the figure protrudes laterally to the indicator side edge portion 22HR formed in a shape recessed in the right side edge portion of the terminal 21 and the left side edge portion of the terminal 21. It consists of the indicator side edge 22HL formed in the form. The recess width of the right index side edge portion 22HR is ¼ of the width dimension of the terminal 21, and the protrusion amount of the left index side edge portion 22HL is about ¼ of the width dimension of the terminal 21. Furthermore, the size is obtained by adding the difference in width between the terminals 17 and 21.

  The allowable amount of displacement in the width direction of both terminals 17 and 21 is set to ¼ of the width dimension of the terminal 21 of the TCP 13. When the terminal 21 of the TCP 13 is displaced to the left side with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within an allowable range, as shown in FIG. In the indicator side edge 22G of the set, the left side edge 17a of the terminal 17 is visually recognized by the left side index side edge GL, and the right side edge 17a of the terminal 17 is hidden by the right side indicator side edge 22GR. Not. When the amount of displacement exceeds the allowable range, as shown in FIG. 21B, the left side index side edge 22GL of the back side index side edge 22G has a side edge 17a of the terminal 17. The surface 12a of the substrate 12 is visually recognized without being visually recognized, the side edge 22GRa of the right index side edge 22GR is arranged on the left side of the right side edge 17a of the terminal 17, and the right side edge 17a of the terminal 17 is visually recognized. Is done.

  On the other hand, when the terminal 21 of the TCP 13 is displaced to the right side with respect to the terminal 17 of the printed circuit board 12 and the amount of displacement is within an allowable range, as shown in FIG. The right side edge 17a of the terminal 17 is visually recognized by the right side index side edge 22HR in the pair of side index edges 22H, and the left side edge 17a of the terminal 17 is hidden by the left side index side edge 22HL. Not visible. When the amount of positional deviation exceeds the allowable range, as shown in FIG. 22B, the side edge 17a of the terminal 17 is located on the right side index side edge 22HR of the front side index side edge 22H. The surface 12a of the substrate 12 is visually recognized without being visually recognized, the side edge 22HLa of the left index side edge 22HL is arranged on the right side of the left side edge 17a of the terminal 17, and the left side edge 17a of the terminal 17 is visually recognized. Is done.

  As described above, when the terminal 21 is shifted to the left side, the rear side index side edge portion 22G is observed, and when the terminal 21 is shifted to the right side, the front side index side edge portion 22H is visually observed. The amount of displacement of the terminal 21 can be detected. If the amount of positional deviation exceeds the allowable range, a change occurs in the paired indicator side edge portions 22G and 22H, so that the positional deviation amount of the terminal 21 can be easily detected.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) The shape of the index side edge can be arbitrarily changed. For example, a configuration in which the peripheral edge of the index side edge is configured by a curved surface is also included in the present invention. Further, the amount of depression (projection amount) at the index side edge can be arbitrarily changed other than those described in the above embodiments. Further, five or more indicator side edges may be provided in one terminal.

  (2) You may make it provide an indicator side edge part in both the terminal of a printed circuit board, and the terminal of TCP.

  (3) In the above-described embodiment, the case where the TCP and the printed circuit board are connected has been illustrated. However, the present invention can also be applied to the case where the TCP and the liquid crystal panel are connected.

  (4) The allowable displacement of both terminals can be changed as appropriate in addition to the above-described embodiments in accordance with the connection resistance value between both terminals set, the performance of the ACF, and the like.

  (5) In the above-described embodiment, the case where both terminals are connected via the ACF has been shown, but the present invention can also be applied to a case where both terminals are connected via, for example, solder.

  (6) In the above-described embodiment, the case where the visual inspection is performed after connecting both terminals is shown. However, the visual inspection is performed after aligning the both terminals, and then the process of connecting both terminals is performed. The present invention is also applicable.

  (7) In the above-described embodiment, the case where the width dimensions of both terminals are different has been described. However, the present invention can also be applied to a case where both terminals have the same width dimension.

  (8) Although the case where TCP formed from a translucent film is connected is shown in the above embodiment, the present invention can also be applied to the case where non-translucent substrates are connected together. In that case, what is necessary is just to test | inspect the position shift of both terminals with an X-ray.

  (9) The present invention can be applied to a plasma display, an EL display and the like in addition to the liquid crystal display device.

1 is a plan view of a liquid crystal display device according to Embodiment 1 of the present invention. Expanded plan view of printed circuit board TCP enlarged plan view Enlarged plan view showing a state where both terminals are connected without misalignment Enlarged plan view showing the case where both terminals are displaced, but the amount of displacement is within the allowable range Enlarged plan view showing the case where both terminals are displaced and the amount of displacement exceeds the allowable range The enlarged plan view of the terminal of TCP concerning Embodiment 2 of the present invention Enlarged plan view showing the case where both terminals are displaced, but the amount of displacement is within the allowable range Enlarged plan view showing the case where both terminals are displaced and the amount of displacement exceeds the allowable range The enlarged plan view of the both terminals which concern on Embodiment 3 of this invention (A) An enlarged plan view showing a case where the TCP terminal is displaced to the left side, but the positional deviation amount is within the allowable range. (B) The TCP terminal is displaced to the left side, and the positional deviation amount exceeds the allowable range. Enlarged plan view showing the case (A) Enlarged plan view showing the case where the TCP terminal is displaced to the right side, but the amount of positional deviation is within the allowable range. (B) The TCP terminal is displaced to the right side, and the amount of positional deviation exceeds the allowable range. Enlarged plan view showing the case The enlarged plan view of both the terminals which concern on Embodiment 4 of this invention (A) Enlarged plan view showing the case where both terminals are displaced, but the amount of displacement is within the allowable range (B) Enlarged view showing the case where both terminals are displaced and the amount of displacement exceeds the allowable range Plan view The enlarged plan view of both the terminals which concern on Embodiment 5 of this invention (A) Enlarged plan view showing the case where both terminals are displaced, but the amount of displacement is within the allowable range (B) Enlarged view showing the case where both terminals are displaced and the amount of displacement exceeds the allowable range Plan view Enlarged plan view of both terminals according to Embodiment 6 of the present invention (A) An enlarged plan view showing a case where the TCP terminal is displaced to the left side, but the positional deviation amount is within the allowable range. (B) The TCP terminal is displaced to the left side, and the positional deviation amount exceeds the allowable range. Enlarged plan view showing the case (A) Enlarged plan view showing the case where the TCP terminal is displaced to the right side, but the amount of positional deviation is within the allowable range. (B) The TCP terminal is displaced to the right side, and the amount of positional deviation exceeds the allowable range. Enlarged plan view showing the case The enlarged plan view of both the terminals which concern on Embodiment 7 of this invention (A) Enlarged plan view showing the case where the TCP terminal is displaced to the left side but the amount of displacement is within the allowable range. (B) The TCP terminal is displaced to the left side, and the amount of positional deviation exceeds the allowable range. Enlarged plan view showing the case (A) An enlarged plan view showing a case where the TCP terminal is displaced to the right side, but the amount of positional deviation is within the allowable range. (B) The TCP terminal is displaced to the right side, and the amount of positional deviation exceeds the allowable range. Enlarged plan view showing the case

Explanation of symbols

12 ... Printed circuit board (the other circuit board)
13 ... TCP (one circuit board, translucent film substrate)
17 ... Terminal 17a ... Side edge 21 ... Terminal 21a ... Side edge 22 (22A, 22B, 22C, 22D, 22E, 22F, 22G, 22H) ... Index side edge (concave)

Claims (8)

A first circuit board having a plurality of terminals arranged on the surface, and a second circuit board having a plurality of terminals aligned with the terminals of the first circuit board arranged on the surface. In the connection structure of the circuit boards that are connected to each other in a state of overlapping each terminal,
The side edge of the terminal of one of the first and second circuit boards is provided with an indicator side edge formed in a form in which a part of the terminal is recessed from the other or protruded. A circuit board connection structure characterized by the above. The circuit board connection structure according to claim 1, wherein the indicator side edge portion is provided by forming a recess in the side edge portion of the terminal. 3. The circuit board connection structure according to claim 2, wherein the recess is formed with a size that is ½ of the width of the terminal. The concave portion is provided so as to form a pair on both side edge portions of the terminal and to be displaced along the longitudinal direction of the terminal, and a portion farthest from the side edge of both concave portions forming the pair is the side. 4. The circuit board connection structure according to claim 2, wherein the circuit board connection structure is formed on a straight line parallel to the edge. 5. The circuit board connection structure according to claim 1, wherein the indicator side edge portion is formed at a distal end portion of the terminal. 6. 6. The circuit board connection structure according to claim 1, wherein the indicator side edge portion is provided on a side edge portion on both sides along the arrangement direction of the terminals. A first circuit board having a plurality of terminals arranged on the surface, and a second circuit board having a plurality of terminals aligned with the terminals of the first circuit board arranged on the surface. A method of manufacturing a circuit board to be connected in a state where each terminal is overlapped with each other,
A terminal that forms a terminal having a shape in which one of the first and second circuit boards has a side edge portion of the terminal that is recessed from the other portion or protrudes from the other portion. By visually observing the forming step, the positioning step of aligning the terminals of one circuit board with respect to the terminals formed on the other side of the circuit board, the connecting step of connecting both terminals to each other, and the indicator side edge A method for manufacturing a circuit board, comprising: performing an inspection process for inspecting a displacement state of both connected terminals. At least one of the circuit boards is a translucent film substrate in which a conductive path having a predetermined pattern is formed on the surface of the translucent film, and the inspection step is performed by visual observation from the translucent film substrate side. A method for manufacturing a circuit board according to claim 7.

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