JP2008117947A - Circuit board, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board, where an FPC or an FFC can be inserted relatively easily regardless of a connector type and cost increase can be reduced. <P>SOLUTION: The circuit board has a connector connected to a flexible printed-wiring board having a reinforcing plate. In the connector, the insertion direction of the flexible printed-wiring board to the connector is parallel to the circuit board. The circuit board has a silk-printed mark at a position on the circuit board corresponding to a position on the end face of the reinforcing plate, when the flexible printed-wiring board is inserted into the connector. Further, when the flexible printed-wiring board is inserted into the connector, the reinforcing plate projects from the connector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a printed wiring board capable of preventing an erroneous insertion operation to a connection connector for a flexible printed wiring board (FPC) or a flexible flat cable (FFC). In particular, the present invention relates to a printed wiring board on which a connector configured so that the insertion direction of the FPC or FFC into the connector is parallel to the printed board.

  As a method for preventing an erroneous insertion operation when a flexible printed wiring board (FPC) is inserted into a connection connector, a proposal has been made to devise the shape of the FPC (for example, see Patent Document 1).

  This conventional example is a proposal for marking on the FPC corresponding to the position of the connector end when the FPC is correctly inserted into the connector to be inserted. For example, the mark is provided by a method of notching both side edges of the FPC, a method of notching only both side edges of the FPC reinforcing plate, or a method of forming a groove on the FPC reinforcing plate so as to coincide with the end of the connector. .

  However, in the above conventional example, it is assumed that the connector into which the FPC is inserted is a connector that rotates and locks as a lock plate for fixing after the FPC is inserted. In other words, in order to confirm the positional relationship between the connector end and the mark on the FPC aligned with the connector end, it is necessary to be able to confirm the mark on the FPC with the connector lock plate released. It is.

  In this conventional method, in the type of connector that slides in the FPC insertion direction and locks the FPC, the mark on the FPC cannot be confirmed with the connector lock plate released. Therefore, there is a disadvantage that a connector that slides in the FPC insertion direction and locks the FPC cannot be used as the connector locking mechanism.

  The type of connector that rotates and locks the lock plate is easy to operate, but if an external force is applied to the FPC in the rotation direction of the lock plate after insertion, the lock is easily released, and as a result, the reliability of joining the FPC and the connector is reliable. It also has the disadvantage that it cannot maintain sex. This is particularly noticeable when an FPC is used for the movable part.

  On the other hand, the type of connector that slides in the insertion direction and locks the FPC has a high reliability of the locking mechanism. However, in this conventional example, when the connector is inserted, it is necessary to slide the lock plate into the FPC in the insertion direction (withdrawal direction) and insert the FPC in the unlocked state. For this reason, with a conventional connector of the type that slides in the insertion direction and locks the FPC, the end of the connector cannot be confirmed in a correctly inserted and locked state. Therefore, the type of connector that slides in the insertion direction and locks the FPC cannot be used.

  Further, if both side edges of the FPC are notched as in the conventional example, the width of the FPC is partially narrowed, which adversely affects the pattern wired in the FPC. For example, there is a concern that the wiring pitch will be narrowed, the impedance of signal pattern lines wired inside will be increased, and the transfer characteristics will be deteriorated. Therefore, an FPC in which signals having important wiring impedance characteristics such as high-speed signals are arranged. However, there is a drawback that it cannot be applied.

  Moreover, it is preferable that the pattern wired at both ends of the FPC is a GND line, and it is preferable that the GND pattern is thickened. The reason for this is to prevent external noise such as static electricity from jumping into the wiring pattern in the FPC.

  However, in the above conventional example, as described above, the width of the FPC becomes narrow, and there is a problem that a thick GND pattern cannot be wired at both ends. In particular, in recent devices that require high-density mounting, if the number of signals to be wired in the FPC is large, the wiring density is high, and the width of the FPC is narrow, it is difficult to realize an FPC with high-density wiring.

Another example for preventing an erroneous insertion operation when an FPC is inserted into a connection connector is known (see, for example, Patent Documents 2, 3, and 4).
JP 2003-174241 A JP 2000-252598 A Japanese Utility Model Publication No. 2-126385 JP 2001-291965 A

  The invention described in Patent Document 2 has a problem of high manufacturing cost because silk, which serves as a guideline for insertion, is printed on the FPC. Also, since silk printing is provided on the FPC itself, the silk printing can be performed by inserting and removing. There is a problem that peeling and connection reliability are low.

  The inventions described in Patent Documents 3 and 4 are inventions that provide protrusions in the width direction of the FPC as a guideline, and do not affect the wiring in the FPC, but are provided with protrusions that are not necessary as basic functions. There is a disadvantage that the material is wasted and the cost is high.

  Further, the conventional example has a drawback that it cannot be applied to a wiring cable having a specification in which a wiring pattern is predetermined and only the length can be changed, such as a flexible flat cable (FFC).

It is an object of the present invention to provide a circuit board in which an FPC or FFC can be inserted relatively easily regardless of the type of connector and the cost increase can be reduced.

The present invention includes a connector connected to a flexible printed wiring board having a reinforcing plate, wherein the insertion direction of the flexible printed wiring board to the connector is parallel to the circuit board. In the present invention, when the flexible printed wiring board is inserted into the connector, there is a mark printed on the circuit board at a position corresponding to the position of the end face of the reinforcing plate. Furthermore, the present invention is a circuit board in which the reinforcing plate protrudes from the connector when the flexible printed wiring board is inserted into the connector.

According to the present invention, the FPC or FFC can be inserted relatively easily regardless of the type of connector, and the cost increase can be reduced.

  The best mode for carrying out the invention is the following embodiment.

  FIG. 1 is a view showing a circuit board CB1 and an FPC 4 that are Embodiment 1 of the present invention, and shows a state in which a slider-type connector 2 is locked.

  FIG. 1A is a schematic view of the circuit board CB1 and the FPC 4 as viewed from above.

  The circuit board CB1 is an embodiment that uses a connector 2 of a type that slides and locks the FPC 4 as an FPC (flexible printed wiring board) connector. The circuit board CB1 includes a connector 2 for the FPC 4, a slider 3, an FPC 4, a silk print 5, and a mark 6. Although not shown, the connector 2 includes a plurality of terminals, which are arranged side by side in FIG.

  The FPC connector 2 is mounted on the circuit board CB1. That is, the connector 2 is a connector that is connected to the flexible printed wiring board 4 including the reinforcing plate 41, and the insertion direction of the flexible printed wiring board 4 to the connector 2 is parallel to the surface of the circuit board CB1. It is an example. That is, in the connector 2, the flexible printed wiring board 4 is inserted in the direction indicated by the arrow along the surface of the circuit board CB1.

  The slider 3 is a lock member for the connector 2. The slider 3 can move in the direction of the arrow and in the direction opposite to the arrow. FIG. 1 (1) shows a locked state. At this time, the FPC 4 is fixed so as not to come off from the connector 2. The silk print 5 on the board is provided as a guide for a place where the connector 2 is mounted, and is usually silk printed with a circuit symbol (an identification symbol on a circuit diagram (not shown)).

  FIG. 1B is a schematic diagram illustrating a cross section of the circuit board CB1 and the FPC4.

  The FPC 4 includes a polyimide reinforcing plate 41, a polyimide base film 42, a copper foil pattern 43, and a coverlay film 44.

  In the FPC 4, for example, a polyimide reinforcing plate 41 is bonded to a polyimide base film 42 (on the back surface of the bonding surface of the FPC 4) with an adhesive. Moreover, the copper foil pattern 43 is joined to the surface with an adhesive. The length of the reinforcing plate 41 is configured to be not hidden by the slider even when the slider 3 is pulled out when the FPC 4 is correctly inserted into the connector 2.

  That is, the reinforcing plate 41 protrudes from the connector 2 when the FPC 4 is inserted into the connector 2.

  And the surface of the copper foil pattern 43 is coat | covered with the coverlay film 44 except the part connected with the connector 2 of the junction part of FPC4. The coverlay film 44 is also made of polyimide, for example, and is bonded by an adhesive.

  Therefore, in the example shown in FIG. 1, the connector 2 and the FPC 4 are in contact with each other on the surface of the FPC 4 on the circuit board CB1 side. If it demonstrates using FIG.1 (2), the cover-lay film 44 is contacting the terminal of the connector 2 on the right side of the copper foil pattern 43 which is not joined.

  Since the base film 42 and the coverlay film 44 are translucent and thin, the color of the reinforcing plate 41 is, for example, white, so that the end (end surface) 41E of the reinforcing plate 41 can be visually recognized.

  The mark 6 is an example of a mark that is silk-printed at a position on the circuit board CB1 corresponding to the position of the end face 41E of the reinforcing plate 41 when the flexible printed wiring board 4 is inserted into the connector 2.

  In FIG. 1, for ease of understanding, the connector 2 and the slider 3 are illustrated as perspective views, and the state of the internal FPC 4 is illustrated so as to be easily understood.

  The mark 6 is formed so that the central corner (vertex) of the mark 6 (Δ mark) coincides with the end face of the reinforcing plate 41 in a state where the FPC 4 is correctly inserted into the connector 2 and is not hidden by the FPC 4. The pair is silk-printed so as to sandwich the FPC 4 on the circuit board CB1.

  FIG. 2 is a diagram illustrating a state in which the slider 3 of the connector 2 is unlocked, and is a diagram illustrating a state in which the slider 3 is pulled out in a direction opposite to the FPC 4 insertion direction, unlocked, and the FPC 4 is inserted. is there. Compared with (1) of FIG. 1 in the unlocked state, the slider 3 shown in (1) of FIG.

  In this state, the FPC 4 is inserted upward in FIG. 2 from the insertion direction of the FPC 4 in the drawing until the end face 41E on the opposite side of the connector 2 of the reinforcing plate 41 matches the left and right marks 6. After that, when the slider 3 is slid and the FPC 4 is locked to the connector 2, the state shown in FIG.

  By doing in this way, the standard of insertion can be recognized easily, the inclination of insertion of FPC4 can be checked easily, and insertion failure can be reduced.

  Further, the silk printing of the mark 6 can be realized in the same process as the normal silk printing performed on the circuit board CB1, so that there is no cost increase.

It should be noted that the length of the triangular mark of the mark 6 that does not face the FPC 4, that is, the length L 1 of the bottom side of the triangular mark of the mark 6 is an allowable error (tolerance) of the insertion position when the FPC 4 is inserted. Then, mark 6 is created. Even if the end face of the reinforcing plate 41 does not completely coincide with the apex of the mark 6, the end face 41E of the reinforcing plate 41 is within the length L1 (in the intersection) of the bottom side. If it can be confirmed, it is enough. If comprised in this way, workability | operativity will improve more.

  FIG. 3 is a diagram showing a circuit board CB2 that is Embodiment 2 of the present invention.

  Elements that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.

  The circuit board CB2 is different from the circuit board CB1 in that a mark 7 is provided instead of the mark 6. The mark 7 is composed of a straight line.

  In FIG. 3, the mark 7 is shown as a perspective view for easy understanding.

  The mark 7 is parallel to the end surface 41E (end surface opposite to the connector 2) of the reinforcing plate 41 in a state in which the FPC 4 is correctly inserted, and is longer than the width of the FPC 4 and linearly, on the circuit board CB2. Printed on top. Although difficult to understand in FIG. 3, the end face 41 </ b> E of the reinforcing plate 41 overlaps the mark 6 when the FPC 4 is correctly inserted.

  By doing so, it is possible to clearly recognize how far the FPC 4 should be inserted before the FPC 4 is inserted into the connector 2 (in the state of a single board). Even after the FPC 4 is inserted into the connector 2, the insertion position can be confirmed by the mark 7 protruding from the FPC 4.

Further, the silk printing length L2 of the mark 7 may be set to a length corresponding to the tolerance (tolerance) of the insertion position when the FPC 4 is inserted, as in the case of the mark 6. In this way, it is sufficient if it can be confirmed that the end face 41E of the reinforcing plate 41 is within the length L2 (within the tolerance) even if it is not completely aligned with the center of the mark 7. If comprised in this way, workability | operativity will improve more.

  FIG. 4 is a diagram showing a circuit board CB3 that is Embodiment 3 of the present invention.

  Elements that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.

  The circuit board CB3 is different from the circuit board CB1 in that a mark 8 is provided instead of the mark 6.

  The mark 6 shown in FIG. 1 and the mark 7 shown in FIG. 3 are marks having lengths L1 and L2 as tolerances. However, in order to recognize insufficient insertion of the FPC 4, if there is no standard, the insufficient insertion is recognized. However, it is easy to discriminate the over-insertion because it hits the connector 2 originally.

  Therefore, the mark 8 is provided with a mark indicating an area so that only insufficient insertion can be recognized.

  If the FPC 4 is inserted so that the end face 41E on the opposite side of the connector 2 of the reinforcing plate 41 is within the area of the mark 8, it is sufficiently effective as a measure of insufficient insertion.

  In the third embodiment, the surface of the FPC 4 that contacts the connector 2 is the board side when the FPC 4 is mounted. That is, it is a case where it contacts between board | substrate CB3 and FPC4. However, the reverse state may be used. That is, as long as the surface on which the terminal of the connector 2 is provided faces the board CB3, the front and back may be reversed when the FPC 4 is inserted.

  As described above, since the film 44 of the FPC 4 is thin, it is possible to easily distinguish the region where the reinforcing plate 41 is provided from the region where the reinforcing plate 41 is not provided from the opposite surface. Therefore, the above effect can be obtained.

In addition, the gist of the above-described embodiment is to provide an indication of an appropriate insertion position of the FPC 4 by using a mark on the FPC 4 and a silk print mark printed on the circuit board. Therefore, if there is a mark on the FPC 4 due to the manufacturing convenience of the FPC 4 and a mark is present at a location on the substrate that can be recognized with the slider 3 pulled out, the mark and the mark on the substrate. You may make it align by these.

  FIG. 5 is a diagram showing a circuit board CB4 that is Embodiment 4 of the present invention.

  Elements that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.

  The circuit board CB4 is characterized in that it shares the silk print 5 on the board (silk print provided for the reference of the location to be mounted on the connector 2) and the mark 9 for the positioning of the FPC 4 in common. is there.

  Since the positioning effect is the same as that of the third embodiment, the description thereof is omitted.

  Since this is shared with the part positioning silk printing, it is possible to more clearly recognize which connector 2 the mark 9 is for.

  Although each said Example is an Example using FPC4 (flexible printed wiring board), you may make it use FFC (flexible flat cable) instead of FPC4, and there exists an effect similar to the above.

According to each of the above embodiments, the FPC 4 or the FFC can be inserted relatively easily regardless of the connector type. Moreover, according to the said Example, since an insertion operation | work is easy, work time is shortened, cost is reduced, work reliability improves, and a better product can be supplied.

It is a figure which shows circuit board CB1 which is Example 1 of this invention, and FPC4, and is a figure which shows the state which locked the connector 2 of the slider type. It is a figure which shows the state by which the slider 3 of the connector 2 was unlocked, and is a figure which shows the state in which the slider 3 is pulled out in the opposite direction to the FPC4 insertion direction, the lock is released, and the FPC4 is inserted. It is a figure which shows circuit board CB2 which is Example 2 of this invention. It is a figure which shows circuit board CB3 which is Example 3 of this invention. It is a figure which shows circuit board CB4 which is Example 4 of this invention.

Explanation of symbols

CB1 ... circuit board,
2 ... Connector,
3 ... Slider,
4 ... FPC,
41 ... Reinforcing plate made of polyimide,
42 ... Base film made of polyimide,
43 ... Copper foil pattern,
44 ... Coverlay film,
5 ... Silk printing,
6 ... Mark,
CB2 ... circuit board,
7 ... Mark,
CB3 ... circuit board,
8 ... Mark,
CB4 ... circuit board,
9 ... Mark.

Claims (4)

A connector connected to a flexible printed wiring board having a reinforcing plate, wherein the insertion direction of the flexible printed wiring board to the connector is parallel to the circuit board;
A mark that is silk-printed at a position on the circuit board corresponding to the position of the end face of the reinforcing plate when the flexible printed wiring board is inserted into the connector;
And the reinforcing plate protrudes from the connector when the flexible printed wiring board is inserted into the connector. A connector connected to a flexible flat cable having a reinforcing plate, wherein the insertion direction of the flexible flat cable into the connector is parallel to the circuit board;
A mark silk-printed at a position on the circuit board corresponding to the position of the end face of the reinforcing plate when the flexible flat cable is inserted into the connector;
And the reinforcing plate protrudes from the connector when the flexible flat cable is inserted into the connector. A connector connected to a flexible printed wiring board having a reinforcing plate, the step of providing the connector so that the insertion direction of the flexible printed wiring board to the connector is parallel to the circuit board;
Silk printing a mark at a position on the circuit board corresponding to the position of the end face of the reinforcing plate when the flexible printed wiring board is inserted into the connector;
Setting the length of the connector such that the reinforcing plate protrudes from the connector when the flexible printed wiring board is inserted into the connector;
A method of manufacturing a circuit board, comprising: A connector connected to a flexible flat cable having a reinforcing plate, the step of providing the connector so that the insertion direction of the flexible flat cable into the connector is parallel to the circuit board;
Silk printing a mark at a position on the circuit board corresponding to the position of the end face of the reinforcing plate when the flexible flat cable is inserted into the connector;
Setting the length of the connector so that the reinforcing plate protrudes from the connector when the flexible flat cable is inserted into the connector;
A method of manufacturing a circuit board, comprising:

Images