JP3886397B2 - Flexible board connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to how to connect the flexible substrate to be connected by soldering to terminals of the flexible substrate and the electrical component.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an electronic device or the like having a movable part, a movable part and a fixed part are connected by a flexible substrate, and signals, electric power, etc. are transmitted between the fixed part and the movable part.
[0003]
In addition, some of the electric parts that are movable parts are equipped with a plurality of terminals. The circuit patterns of the terminals and the flexible board are electrically connected by soldering, and the terminals of the electric parts and the flexible board are connected. As a method, for example, the method shown in FIGS. 5 to 7 has been conventionally employed.
[0004]
An electrical component a such as a connector has a protrusion c having a plurality of terminals b on one side or both sides.
[0005]
The flexible substrate d is composed of a film-shaped substrate e and a conductive circuit pattern f formed on one surface of the substrate e, and an electrical connection is made to a connecting portion k provided on one end side of the flexible substrate d. A long fitting hole g that can be fitted to the protrusion c of the component a is opened.
[0006]
The width t _{1 of the} fitting hole g is previously formed larger or smaller than the width t ₂ of the protrusion c, and the circuit pattern f of each terminal b of the electrical component a and the flexible substrate d is formed as follows. Connected.
[0007]
When the width t _{1 of the} fitting hole g opened at the end of the flexible substrate d is larger than the width t ₂ of the protruding portion c of the electric component a, the fitting hole of the flexible substrate d is formed in the protruding portion c of the electric component a. When g is fitted, as shown in FIG. 6 , the circuit of the terminal b and the flexible substrate d of the electrical component a with one opening edge j of the fitting hole g brought into contact with one side surface of the protruding portion c. The pattern f is soldered.
[0008]
Also if the width t ₁ of the apertured fitting hole g has a width t ₂ is smaller than the projecting portion c of the electrical component a is the end of the flexible substrate d, mating electrical components a flexible substrate d the protrusion c of When the hole g is fitted, the opening edge j of the fitting hole g is bent toward the circuit pattern f side as shown in FIG. 8 along both side surfaces of the protrusion c, and in this state, the terminal b of the electrical component a The circuit pattern f of the flexible substrate d is soldered.
[0009]
[Problems to be solved by the invention]
However, as shown in FIG. 6 , in the case where the width t ₁ of the fitting hole g of the flexible board d is larger than the width t ₂ of the protrusion c of the electrical component a, the circuit of the terminal b and the flexible board d of the electrical component a When the pattern f is soldered, a part of the solder flows into the gap h formed between the side surface of the protrusion c and the opening edge j of the fitting hole g to generate a solder bridge. There is a problem such as a short circuit between the terminals b.
[0010]
Further, as shown in FIG. 7 , in the case where the width t ₁ of the fitting hole g of the flexible substrate d is smaller than the width t ₂ of the protrusion c of the electrical component a, the circuit pattern f side along the side surface of the protrusion c Since the step i is generated between the terminal b and the circuit pattern f due to the thickness of the opening edge j bent to the right, there is a problem that the solder m is divided by the step i to cause poor soldering.
[0011]
The present invention has been made to improve the conventional problems such, it is an object to provide a connection methods of the flexible substrate without solder bridges and soldering defects occur.
[0012]
[Means for Solving the Problems]
Method of connecting a flexible board of the present invention for achieving the above object, there is provided a method of connecting a flexible board to be connected by soldering the terminals of the circuit pattern and electrical components formed on the flexible substrate, the connecting portions of the flexible substrate Insert the connection jig into the open fitting hole from the circuit pattern side, bend the opening edge of the fitting hole, and then fit the connection jig to the protruding part with the terminal in this state, then connect jig only withdrawn from the protruding portion, the pressure contact of the circuit pattern to the terminal, it is then that the circuit pattern and the terminal was soldered in this state.
[0013]
According to the above method, since the protruding part of the electrical component can be inserted into the fitting hole of the flexible board in a state where the opening edge of the fitting hole is bent by the connecting jig, the connection work of the flexible board can be efficiently performed in a short time. In addition to being able to do this, there is no gap between the side of the protrusion and the opening edge of the fitting hole, eliminating the conventional problems such as short circuit between the terminals caused by the solder flowing into the gap. In addition, even if the opening edge of the fitting hole is bent, there is no step between the circuit pattern and the terminal, so that it is possible to prevent poor soldering.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings shown in FIGS.
[0015]
1 to 3 are process diagrams showing a method of connecting a flexible substrate to an electrical component, and FIG. 4 is a cross-sectional view showing a connection structure of the flexible substrate connected by the connection method.
[0016]
As shown in FIG. 2, the electrical component 2 to which the flexible substrate 1 is connected is, for example, a connector, and has a flange portion 2b protruding from one end side of a cylindrical main body 2a having a two-sided width formed on the outer peripheral surface. And the protrusion part 2d protrudes in the end surface of the collar part 2b via the step part 2c.
[0017]
The projecting portion 2d has a flat rectangular shape, and a plurality of terminals 3 are formed on both side surfaces in the longitudinal direction at intervals in the longitudinal direction of the projecting portion 2d, and at the tip of the projecting portion 2d. Are provided with the same number of contacts 3 a as those of the terminals 3.
[0018]
In the flexible substrate 1, a circuit pattern 1b made of a conductor is formed on one surface of a film-like substrate 1a.
[0019]
One end side of the flexible substrate 1, have slightly larger oval-shaped connecting portion 1c from the flange portion 2b of the electrical component 2 is formed, a small width t ₁ than the width t ₂ of the projecting portion 2d to the connection portion 1c A long hole-like fitting hole 1d is opened.
[0020]
At both ends of the fitting hole 1d, four notches 1f are formed so that the opening edge 1e on the long side of the fitting hole 1d is easily bent in the vertical direction, and the opening of the fitting hole 1d is opened. On the edge 1e, lands 1g are formed in the same arrangement as the terminals 3 of the electrical component 2, and these lands 1g are electrically connected to the ends of the circuit pattern 1b.
[0021]
Next, a connection method for connecting the circuit pattern 1b of the flexible substrate 1 to each terminal 3 of the electrical component 2 will be described in detail with reference to FIGS.
[0022]
In connecting the flexible substrate 1 to the terminal 3 of the electrical component 2, first, a connection jig 4 as shown in FIG. 1 is prepared.
[0023]
The connecting jig 4 is formed in a flat box shape by a thin metal plate or the like, and the width t ₃ and the lateral length are slightly larger than the width t ₂ and the length of the protruding portion 2 d of the electrical component 2. The end face on one end side of the connecting jig 4 is cut out from the one end side to substantially the middle part.
[0024]
In connecting the flexible substrate 1 to the terminal 3 of the electrical component 2 using the connection jig 4, first, as shown in FIG. 1, one end side of the connection jig 4 is connected to the fitting hole 1 d of the flexible substrate 1. And press-fitting from the circuit pattern 1b side.
[0025]
Since the width t ₃ of the connecting jig 4 is larger than the width t _{1 of the} fitting hole 1 d in advance (t ₁ <t ₂ <t ₃ ), the opening edge 1 e of the fitting hole 1 d is formed by the connecting jig 4. It is bent in the direction opposite to the circuit pattern 1b.
[0026]
In this state, as shown in FIG. 2, when one end side of the connection jig 4 is inserted into the protruding portion 2d of the electrical component 2 from the front end side, the connection jig 4 is shown while holding the connection portion 1c of the flexible substrate 1 so as not to come out. 3. Pull upward as shown in 3.
[0027]
As a result, the land 1g formed on the opening edge 1e of the fitting hole 1d is pressed against each terminal 3 of the electrical component 2 by the elasticity of the board 1a as shown in FIG. By soldering, the circuit pattern 1b of the flexible substrate 1 and each terminal 3 of the electrical component 2 can be reliably connected.
[0028]
Further, since no gap is generated between the side surface of the protruding portion 2d of the electrical component 2 and the fitting hole 1d of the flexible substrate 1, no solder bridge is generated, and the opening edge 1e of the fitting hole 1d is the protruding portion. Even if it is bent along the side surface of 2d, it is bent in the direction in which the terminal 3 and the land 1g are in direct contact with each other, so that there is no step that divides the solder, so that no solder failure occurs.
[0029]
In the above embodiment, the case where the flexible substrate 1 is connected to the electrical component 2 provided with the terminals 3 on both sides of the protruding portion 2d has been described. However, the electrical component 2 having the terminals 3 on one side of the protruding portion 2d is also described. It can be implemented similarly.
[0030]
【The invention's effect】
As described above in detail, when the circuit pattern formed on the flexible substrate and the terminal of the electrical component are connected by soldering, the present invention presses the circuit pattern against the terminal using the elasticity of the flexible substrate, and this state Since the circuit pattern and the terminal are soldered in step 3, the circuit pattern and the terminal can be soldered in a state where the circuit pattern of the flexible substrate is in direct contact with the terminal of the electrical component. Easy and reliable.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a flexible substrate connection method according to an embodiment of the present invention. FIG. 2 is a process diagram showing a flexible substrate connection method according to an embodiment of the present invention. FIG. 4 is a sectional view showing a flexible substrate connection structure according to an embodiment of the present invention. FIG. 5 is an explanatory diagram showing a conventional flexible substrate connection method. 6 is an explanatory diagram showing a conventional flexible substrate connection structure. FIG. 7 is an explanatory diagram showing a conventional flexible substrate connection structure.
DESCRIPTION OF SYMBOLS 1 Flexible substrate 1b Circuit pattern 1c Connection part 1d Fitting hole 1e Opening edge 2 Electrical component 2d Protrusion part 3 Terminal 4 Connection jig

Claims (1)

  A flexible board connection method for connecting a circuit pattern formed on a flexible board to a terminal of an electrical component by soldering, and a connection jig is inserted from the circuit pattern side into a fitting hole opened in the connection part of the flexible board. Then, after bending the opening edge of the fitting hole, and then fitting the connecting jig to the protruding portion provided with the terminal in this state, only the connecting jig is extracted from the protruding portion, The circuit pattern is pressed against the terminal, and the circuit pattern and the terminal are then soldered in this state.

Images