CN1197444C - Soldering method between golden fingers on PCB and pins of flexible printed circuit - Google Patents
Soldering method between golden fingers on PCB and pins of flexible printed circuit Download PDFInfo
- Publication number
- CN1197444C CN1197444C CN 00129665 CN00129665A CN1197444C CN 1197444 C CN1197444 C CN 1197444C CN 00129665 CN00129665 CN 00129665 CN 00129665 A CN00129665 A CN 00129665A CN 1197444 C CN1197444 C CN 1197444C
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- golden finger
- printed circuit
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- tin
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Abstract
The present invention discloses a soldering method between golden fingers on PCB and pins of flexible printed circuits (FPC). Firstly, tin paste is printed on a golden finger of a printed circuit board by a surface adhesion method (SMT); after the tin paste passes through a tin furnace, the tin paste is cooled to form a tin ball on the golden finger; finally, a flexible printed circuit is soldered on the golden finger of the printed circuit board by a hot pressing method. The present invention effectively shortens the time needed by the hot pressing junction by the characteristic program that the tin ball is formed on the golden finger of the printed circuit board by the SMT, and reduces the time of the soldering method. In this way, the present invention enhances the junction strength between the printed circuit board and the flexible printed circuit.
Description
Technical field
The invention relates to the welding method of printed circuit on a kind of printed circuit board (PCB), especially refer to a kind of hot pressing welding method of quickening, strengthen the bond strength between specific place golden finger and pin, effectively promote the welding method of pliable printed circuit between the pin of golden finger and pliable printed circuit on the printed circuit board (PCB) of bond strength on the printed circuit board (PCB).
Background technology
In known electronic component, normally reach the main configuration of utilization circuit with a printed circuit board (PCB), use between device with terminal at printed circuit board (PCB) then to be connected with a pliable printed circuit; See also shown in Figure 1, be a known printed circuit board (PCB) (Printed Circuits Board, PCB) 1 and one pliable printed circuit (Flexible Printed Circuits, FPC) 2 joint decomposing schematic representation, the one end extension of this printed circuit 2 is connected on the terminal utilization device (not shown), the other end then constitutes the pin 21 that most braces have solder printing on the one side of printed circuit board (PCB) 1, on the position of printed circuit board (PCB) 1 with respect to each pin 21, then be respectively equipped with most golden fingers 11, nationality is connected in the circuit arrangement of printed circuit board (PCB) 1 circuit of terminal utilization device by the solder joints of 11 of corresponding pin 21 and golden fingers.
See also shown in Figure 2, be the welding method flow chart between the pin of golden finger and pliable printed circuit on the known printed circuit board (PCB), in this known method, the pin of printed circuit end has had scolding tin, and, then do not have tin cream at corresponding printed circuit edge connector one end; At last, carry out the hot pressing welding between corresponding pin and golden finger again, this mode is that nationality is by thermal head feeding downwards above printed circuit, printed circuit is pressed on the printed circuit board (PCB) heating one special time, make scolding tin raw material on the pin be melted and be welded on the corresponding golden finger.
But aforementioned known welding method, need the time to treat the scolding tin raw material melted by heating of pin on the pliable printed circuit after, just can carry out solder joints, the hot pressing welding process needs a period of time, so hot pressing can't further compress weld time.The not enough hot pressing time will cause engaging bad; Easy and the golden finger disengaging of pliable printed circuit, and then the situation that causes pliable printed circuit to come off.
Observing the situation that pliable printed circuit comes off finds: the section start that comes off is that situation about coming off with particular side (being generally the both sides of edges of weld) is more.Trace it to its cause, one is the hot pressing characteristic between printed circuit and printed circuit board (PCB), see also shown in Figure 3, heat energy distribution schematic diagram for the welding method of 21 of the pins that apply to golden finger 11 and pliable printed circuit 2 on the printed circuit board (PCB) 1 along thermal head 3 front ends, as seen from the figure, boundary condition relation because of thermal head 3 both sides, so heat 3 heats that can provide (being shown by thermal output line 4) respectively form low district (dotted line A district among the figure and B district) of a heat energy in both sides, and learn that by experience the bonding strength that is in 11 of pin 21 in the low district of this heat energy and golden fingers is promptly relatively poor.
Have again, reason two be printed circuit with printed circuit board (PCB) after engaging, the easiest formation stress was concentrated part after it was stressed, be two outer side edges that printed circuit engages with printed circuit board (PCB), especially when assembling and disassembling, put on external force between printed circuit and printed circuit board (PCB) and be generally deflecting force on the specific direction, so as easy as rolling off a log bigger stress that on a side, forms, in addition former design originally just forms the low district of heat energy because of heat energy is welded on the both sides joint again, be with, usually between the golden finger of the pin of the pliable printed circuit of particular side and printed circuit board (PCB), the normal destruction that joint takes place.
Summary of the invention
In view of this, main purpose of the present invention is to provide the welding method between the pin of golden finger and pliable printed circuit on a kind of printed circuit board (PCB), its nationality can be quickened the hot pressing of golden finger and pliable printed circuit pin by the surface adhering method, with effective shortening hot press required time, and take this to increase the bond strength of this weld.
For achieving the above object, the invention provides the welding method between golden finger and pliable printed circuit pin on a kind of printed circuit board (PCB), this pin is positioned at an end of this pliable printed circuit, and has scolding tin on this pin, this golden finger comprise one first side golden finger, one second side golden finger and be arranged in this first side golden finger and this second side golden finger between a plurality of in the middle of golden finger, it is characterized in that this welding method comprises:
(1) on this first side golden finger, attaches scolding tin; And
(2) with the method for a hot pressing, the mode with relative this golden finger of this pin is welded in this pliable printed circuit on this printed circuit board (PCB).
The present invention also provides the welding method between the pin of golden finger and pliable printed circuit on the another kind of printed circuit board (PCB), this pin is positioned at an end of this pliable printed circuit, and have scolding tin on it, this pin comprise one first side pin, one second side pin again and be arranged in this first side pin and this second side pin between a plurality of in the middle of pin; It is characterized in that: this welding method comprises:
(1) attach another scolding tin on this first side pin of this pliable printed circuit, the soldering tin amount that makes this first side pin is more than the soldering tin amount on this second side pin and this a plurality of middle pins; And
(2), and, this pliable printed circuit is welded on this printed circuit board (PCB) in this pin mode of this golden finger relatively with the method for a hot pressing
In the present invention, can attach tin cream on first, second side golden finger respectively at printed circuit board (PCB), take this required time of shortening heat pressing welding method, and the bond strength between increase printed circuit board (PCB) and printed circuit, printed circuit board (PCB) can be guaranteed with printed circuit engaging all on both sides.
Attach bestowing of scolding tin on the printed circuit edge connector, can on golden finger in the middle of most, attach kenel with a specific scolding tin scolding tin is formed on the corresponding middle golden finger again; This specific scolding tin attaches kenel, can be to attach this scolding tin on golden finger in the middle of each or attach scolding tin, also or other similar scolding tin distribution kenels at interval on middle golden finger.
And in the present invention, in attaching the process of scolding tin to the golden finger, it attaches area and can be and contain this golden finger fully or only be stacked on the golden finger of part.
For the bond strength on the specific region between the pin that can strengthen golden finger and pliable printed circuit on the printed circuit board (PCB), put on suitable golden finger place so will attach scolding tin, use the weld strength after promoting this place and pin and welding; Also can attach scolding tin simultaneously on special pin, nationality is to produce the preferable welding of a bond strength.
Attaching scolding tin on pin the time, its implementation method is ditto described; And on pin, attach the enforcement of scolding tin, can be direct interpolation scolding tin and to specific pin or in the mode that increases the special pin area, implement.
Nationality is by method of the present invention, the golden finger structure of a kind of printed circuit board (PCB) after it is implemented, include one first side golden finger, one second side golden finger and be arranged in this first side golden finger and the second side golden finger between a plurality of in the middle of golden finger, it is characterized in that tin cream screen plate printing method, on this first side golden finger, attach tin cream with the surface adhering method.
Welding method on the printed circuit board (PCB) provided by the present invention between the pin of golden finger and pliable printed circuit, its nationality is attached the program of tin cream at a specific golden finger place before welding by the SMT method, quickening golden finger engages with the hot pressing of pliable printed circuit pin, with effective shortening hot press required time, thereby under the prerequisite that does not influence welding quality, shortened the welding required time effectively.And, nationality is by the scolding tin that attaches on the golden finger, being strengthened golden finger engages with scolding tin between pin, take this to increase the bond strength of this weld after welding, and then promoted the bond strength of printed circuit board (PCB) and printed circuit junction, can effectively avoid the normal particular side that takes place of printed circuit board (PCB) and printed circuit welding to engage destruction.
Description of drawings
Relevant detailed description of the present invention and technology contents, conjunction with figs. is described as follows:
The element decomposing schematic representation that engages between the pin of Fig. 1 for golden finger on the known printed circuit board (PCB) and pliable printed circuit;
Fig. 2 is the welding method flow chart between the pin of golden finger and pliable printed circuit on the known printed circuit board (PCB);
Fig. 3 is the heat energy distribution schematic diagram along the thermal head front end that applies to the welding method between the pin of golden finger and pliable printed circuit on the printed circuit board (PCB);
Fig. 4 A is the flow chart of welding method first embodiment between the pin of golden finger on the printed circuit board (PCB) of the present invention and pliable printed circuit;
Fig. 4 B is the flow chart of welding method second embodiment between the pin of golden finger on the printed circuit board (PCB) of the present invention and pliable printed circuit;
Fig. 5 is the schematic diagram of golden finger first embodiment on the printed circuit board (PCB) among the present invention;
Fig. 6 is the schematic diagram of golden finger second embodiment on the printed circuit board (PCB) among the present invention;
Fig. 7 is the schematic diagram of golden finger the 3rd embodiment on the printed circuit board (PCB) among the present invention;
Fig. 8 is the schematic diagram of golden finger the 4th embodiment on the printed circuit board (PCB) among the present invention;
Fig. 9 is the schematic diagram of pin first embodiment on the pliable printed circuit among the present invention;
Figure 10 is the schematic diagram of pin second embodiment on the pliable printed circuit among the present invention;
Figure 11 is the schematic diagram of pin the 3rd embodiment on the pliable printed circuit among the present invention; And
Figure 12 is the schematic diagram of pin the 4th embodiment on the pliable printed circuit among the present invention.
Embodiment
Welding method on a kind of printed circuit board (PCB) of the present invention between the pin of golden finger and pliable printed circuit, its main thinking be at nationality by the scolding tin that attaches that puts on the printed circuit edge connector, shorten the weld time of a golden finger and a pliable printed circuit; And nationality reaches the purpose of strengthening the specific region bond strength by attach the extra soldered intensity that scolding tin is provided when welding.
See also shown in Fig. 4 A, flow chart for welding method first embodiment between the pin of golden finger and pliable printed circuit on the printed circuit board (PCB) of the present invention, its step is to form most braces earlier the golden finger of scolding tin to be arranged on a printed circuit board (PCB) (step 101), the method of its formation be utilize surface adhering method (SMT) with paste solder printing on golden finger, form the tin ball through cooling behind the tin stove.At this, most golden fingers and the corresponding setting of the pin on the printed circuit, its can be the first side golden finger, the second side golden finger and be arranged in the first side golden finger and the second side golden finger between the combination in any of middle golden finger.The main feature of this step is to form one to attach scolding tin at least one golden finger, this attaches the hot pressing weld time that scolding tin can shorten a golden finger and a pliable printed circuit, and can further be applied to engage the more weak part of intensity between printed circuit board (PCB) and printed circuit, with reinforcement weld strength herein.
Then, get a pliable printed circuit, and has scolding tin (step 200) on its pin, then, again with the method (step 300) of a hot pressing, in the mode of the relative golden finger of pin, will attach the tin cream heating and melting on tin cream on the pliable printed circuit pin and the golden finger, pliable printed circuit is welded on the printed circuit board (PCB).
In the present invention, the placement that attaches tin cream on the golden finger can be applicable in printed circuit board (PCB) and the printed circuit junction than destructible or bears big external force part, a tangible place is on the side that printed circuit board (PCB) engages with printed circuit, that is the place of the first side golden finger and the first side pin.Be with, in the enforcement of present embodiment, can will attach tin cream put on the first side golden finger, take this, but except that shortening heat pressing weld time, more can reach and strengthen the purpose that this face down bonding tin engages, effectively to avoid printed circuit board (PCB) and the printed circuit destruction easily on this side; This one attach bestowing of tin cream can be referring to shown in Figure 5, wherein, one to attach tin cream 12 be to carry out in the mode that part covers golden finger 11, certainly, it can also be illustrated as many area coverages and implement.
In the present invention, for shortening heat pressing weld time more and increase bond strength between printed circuit board (PCB) and printed circuit, except that on the first side golden finger of printed circuit board (PCB), attaching the tin cream, can form another again and attach tin cream on the second side golden finger, take this, printed circuit board (PCB) can be guaranteed with printed circuit engaging all on both sides; Its enforcement can be as shown in Figure 6, and what be provided with on the both sides respectively at golden finger 11 that reinforcement uses attaches tin cream 12.
Certainly, the tin cream that attaches on the printed circuit edge connector of the present invention is bestowed, and except that the situation of aforementioned two embodiment, can attach kenel with a specific tin cream tin cream is formed on the corresponding middle golden finger on golden finger in the middle of most again; This specific tin cream attach kenel can be as shown in Figure 8 with golden finger 11 in the middle of each all addition attach tin cream 12, also or mode with at interval shown in Figure 7 attaches tin cream 12 at interval on middle golden finger 11, other similarly suitable tin cream distribution kenels that attach also are enforcement category of the present invention certainly.
As Fig. 7 and shown in Figure 8, the tin cream 12 that attaches wherein is to be arranged on the golden finger 12 in the mode that is misplaced, and its main purpose is to produce the tin that overflows when avoiding printed circuit and printed circuit board (PCB) in pressing, prevents to connect between scolding tin the generation of short circuit condition.
Among the present invention, as previously mentioned, it is in attaching the process of tin cream to the golden finger, and it attaches tin cream and can contain this golden finger fully, also or only be stacked on the golden finger of part.
In the aforementioned embodiment, for can shortening heat pressing weld time and strengthen bond strength between the pin of golden finger and pliable printed circuit on the printed circuit board (PCB), so attach tin cream in the golden finger place; And in another enforcement state of the present invention, except attaching tin cream in the golden finger place, more can attach scolding tin on pin, nationality is so that the tin cream amount on the special pin increases (promptly having a certain amount of tin cream on the former pin), when making the golden finger welding of itself and printed circuit board (PCB), can produce the better welding of intensity.
See also shown in Fig. 4 B, flow chart for welding method second embodiment between the pin of golden finger and pliable printed circuit on the printed circuit board (PCB) of the present invention, wherein, earlier on the pin of pliable printed circuit, attach scolding tin (step 201) on special pin, and on printed circuit board (PCB), form the majority that tool attaches tin cream and prop up golden finger (step 101), last, in the hot pressing mode, pin is welded on the corresponding golden finger again.
One implement at this, because of pin promptly has a certain amount of tin cream in former making, so in the utilization that attaches tin cream, can be direct interpolation tin cream to specific pin, also or in the mode of increase special pin area implement.
See also Fig. 9 to shown in Figure 12, in this second embodiment, attach the enforcement of tin cream on pin 21 (pin that attaches tin cream is with 21 ' expression) and can be same as aforesaid embodiment method, be added on (as shown in Figure 9) on the first side pin respectively, be added on (as shown in figure 10) on the pin of both sides or attach kenel and increase tin cream on the pin (as the interval mode of Figure 11 or as the continuation mode of Figure 12) with a specific tin cream; And in Fig. 9 to Figure 12, attach the enforcement of tin cream on its pin, be to implement in the mode that increases the special pin area.
Among the present invention, the mode of tin cream at printed circuit board (PCB) that attach is set, can and with the tin cream screen plate printing method of the surface adhering technology of former printed circuit board (PCB), will attach tin cream and be stacked on the golden finger; So implementing when of the present invention, do not having the doubt that increases method step and cost for the making of printed circuit board (PCB).
As previously mentioned, welding method on the printed circuit board (PCB) of the present invention between the pin of golden finger and pliable printed circuit, but nationality is by the preceding program that attaches tin cream in the weld of specific golden finger and pin of welding, increase the bond strength after this welding is in welding, take this effectively to improve the bond strength between printed circuit board (PCB) and pliable printed circuit, and reach the purpose that shortens golden finger and pliable printed circuit weld time.
The above only is several embodiment that add of the present invention, is not to be used to limit protection scope of the present invention.
Claims (12)
1, the welding method between golden finger and pliable printed circuit pin on a kind of printed circuit board (PCB), this pin is positioned at an end of this pliable printed circuit, and has scolding tin on this pin, this golden finger comprise one first side golden finger, one second side golden finger and be arranged in this first side golden finger and this second side golden finger between a plurality of in the middle of golden finger, it is characterized in that this welding method comprises:
(1) on this first side golden finger, attaches scolding tin; And
(2) with the method for a hot pressing, the mode with relative this golden finger of this pin is welded in this pliable printed circuit on this printed circuit board (PCB).
2, welding method according to claim 1 is characterized in that: step (1) also is included on this second side golden finger and attaches this scolding tin.
3, welding method according to claim 1 is characterized in that: attach this scolding tin on this centre golden finger of part of golden finger again in the middle of these are a plurality of in this step (1).
4, welding method according to claim 1 is characterized in that: this step (1) be and in the middle of these are a plurality of on golden fingers the compartment of terrain on this centre golden finger, attach this scolding tin.
5, welding method according to claim 1, it is characterized in that: the process of this step (1) is the tin cream screen plate printing method by the surface adhering technology, on this printed circuit edge connector, this tin cream forms one through tin stove heating back cooling and attaches scolding tin on this golden finger subsequently with paste solder printing.
6, the welding method between the pin of golden finger and pliable printed circuit on a kind of printed circuit board (PCB), this pin is positioned at an end of this pliable printed circuit, and have scolding tin on it, this pin comprise one first side pin, one second side pin again and be arranged in this first side pin and this second side pin between a plurality of in the middle of pin; It is characterized in that: this welding method comprises:
(1) attach another scolding tin on this first side pin of this pliable printed circuit, the soldering tin amount that makes this first side pin is more than the soldering tin amount on this second side pin and this a plurality of middle pins; And
(2), and, this pliable printed circuit is welded on this printed circuit board (PCB) in this pin mode of this golden finger relatively with the method for a hot pressing.
7, welding method according to claim 6 is characterized in that: attaching another scolding tin described in this step (1), with this second side pin with should compare by a plurality of centres pins, is to implement to increase the area mode of this scolding tin on this first side pin.
8, welding method according to claim 6 is characterized in that: be included in again in this step (1) on this second side pin and attach this another scolding tin.
9, welding method according to claim 6 is characterized in that: be included in again in this step (1) on a plurality of middle pins, attach this another scolding tin respectively with interval mode.
10, a kind of golden finger structure of printed circuit board (PCB), include one first side golden finger, one second side golden finger and be arranged in this first side golden finger and the second side golden finger between a plurality of in the middle of golden finger, it is characterized in that tin cream screen plate printing method, on this first side golden finger, attach tin cream with the surface adhering method.
11, golden finger structure according to claim 10 is characterized in that: be included in again on this second side golden finger and attach this tin cream.
12, golden finger structure according to claim 10 is characterized in that: comprise again with the interval kenel attaching this tin cream respectively on the golden finger in the middle of these are a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00129665 CN1197444C (en) | 2000-10-10 | 2000-10-10 | Soldering method between golden fingers on PCB and pins of flexible printed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00129665 CN1197444C (en) | 2000-10-10 | 2000-10-10 | Soldering method between golden fingers on PCB and pins of flexible printed circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1347275A CN1347275A (en) | 2002-05-01 |
| CN1197444C true CN1197444C (en) | 2005-04-13 |
Family
ID=4593658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00129665 Expired - Fee Related CN1197444C (en) | 2000-10-10 | 2000-10-10 | Soldering method between golden fingers on PCB and pins of flexible printed circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1197444C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429964C (en) * | 2004-12-09 | 2008-10-29 | 比亚迪股份有限公司 | Flexible printed circuit board and method for connecting printed circuit board thereof |
| CN100411498C (en) * | 2005-11-25 | 2008-08-13 | 惠州Tcl移动通信有限公司 | Assembly of FPC and PCB |
| CN100401273C (en) * | 2006-03-17 | 2008-07-09 | 骆建军 | Electronic anti-fogery card based on FLASII memory card interface standard |
| CN101365299B (en) * | 2008-09-19 | 2010-06-02 | 深圳市和美精艺科技有限公司 | Manufacturing method for memory card series circuit board having thickened golden finger and memory card |
| CN107617816B (en) * | 2017-10-31 | 2020-04-07 | 深圳瑞柏科技有限公司 | Soft board pulse hot-press welding method |
| CN108037623A (en) * | 2017-11-29 | 2018-05-15 | 北海星沅电子科技有限公司 | A kind of FPC and PCB connection methods |
-
2000
- 2000-10-10 CN CN 00129665 patent/CN1197444C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1347275A (en) | 2002-05-01 |
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