JPH0750821B2 - Flexible board connector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector portion provided at an end portion of a flexible board.

[0002]

2. Description of the Related Art Conventionally, in order to connect a flexible board to another electronic component, a conductor pattern is drawn out from an end of the flexible board to form a connector portion, which is then attached to another electronic component on a female side. This is done by plugging it into the connector.

11A and 11B are views showing a portion of a connector portion 81 of a conventional flexible substrate of this type. FIG. 11A is a perspective view, FIG. 11B is a plan view, and FIG. Figure (b)
It is a sectional view taken along line aa of FIG.

As shown in the figure, the connector 81 is
A conductive pattern 85 is provided on a synthetic resin film 83, and a reinforcing plate 89 is attached to the back surface of the film 83 with an adhesive 87. Here, the reinforcing plate 89 is made of a synthetic resin plate which is not easily bent. The carbon film 8 is formed on the conductor pattern 85.
5a is printed.

The reinforcing plate 89 is attached here because the film 83 is thin and easily bent, so that the connector portion 81 cannot be successfully connected to the female connector without attaching the reinforcing plate 89. For this reason, the connector 81 of the flexible substrate always requires the reinforcing plate 89.

FIG. 12 is a diagram showing a method of manufacturing the conventional connector portion 81. As shown in the figure, in order to manufacture the connector portion 81, a large number of sets of conductor patterns 85 and a carbon film 85a are printed on a large film 83, and a long surface is formed on the lower surface of the film 83 with an adhesive. A reinforcing plate 89 is attached, and this is press cut to punch out the outer shape of the connector portion 81.

[0007]

However, in the above-mentioned conventional connector portion 81, since the outer periphery of the adhesive 87 is exposed outside between the film 83 and the reinforcing plate 89,
Dust tends to adhere to the exposed portion c of the adhesive 87. Then, when the connector portion 81 with the dust adhered thereto is inserted into the female connector, the dust adheres to the contact portion or the like, which may cause a connection failure between the two.

Further, when press-cutting is performed by the method shown in FIG. 12, an adhesive agent adheres to the press-cutting teeth, and it takes time and effort to wipe it off, leading to an increase in manufacturing cost.

The present invention has been made in view of the above points, and an object thereof is to provide a connector portion of a flexible substrate which can reinforce the connector portion without using an adhesive.

[0010]

In order to solve the above-mentioned problems, the present invention forms a conductor pattern on a film made of synthetic resin, and forms a part of the conductor pattern up to or near the end of the film. In a connector portion of a flexible substrate having a structure in which a connector portion is drawn out to form a connector portion , an ultraviolet-curing type is provided in a predetermined range on the back surface of the film forming the connector portion.
Apply at least two layers of paint to cure and
The UV curable paint for the upper layer is the UV curable paint for the other layers.
We decided to make the thickness thinner than that of.

[0011]

The ultraviolet-curable coating material is thickly applied to the back surface of the film forming the connector portion and cured, so that the connector portion of the flexible substrate can be reinforced. Moreover, since the applied and cured UV-curable paint has no adhesiveness, dust does not adhere to it. UV hard
Unlike other normal paints, chemical type paints are dissolved in a solvent.
Since it is not, the thick coating can be done easily. Therefore few
Sufficient thickness can be obtained even with a thick layer, which shortens the manufacturing time accordingly.
Can be achieved. In addition, change the thickness of the UV curable coating on the top layer to
Since it was made thinner than the thickness of the UV curable paint of the layer,
UV-curable paint other than the top layer for thick coating
Even if the surface of the surface is roughened by increasing the viscosity of
The viscosity of the external-curable coating can be reduced and the surface can be easily slipped.
You can make it easy.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 are views showing a process of manufacturing a connector portion of a flexible substrate according to a first embodiment of the present invention, in which (a) is a plan view and (b) is a side sectional view (see FIG. It is AA sectional drawing of a).

In order to manufacture the connector portion of this flexible substrate, first, as shown in FIG. 1, a synthetic resin film 1 is used.
The seven conductor patterns 11 are printed on the 0 by screen printing. Here, the film thickness 1 is 1
00 μm polyethylene terephthalate is used.

Although only the end portion of the conductor pattern 11 is shown in this drawing, the conductor pattern 11 actually constitutes a circuit of a flexible substrate (not shown) in other portions.

Next, as shown in FIG. 2, each conductor pattern 1
The carbon film 13 is screen-printed so as to cover the end portion of 1.

Next, as shown in FIG. 3, on the back surface side of the portion where the carbon film 13 of the seven conductor patterns 11 is printed,
The first layer of UV curable coating material (ultraviolet curable coating material) 15 is thickly applied by one screen printing so as to have a thickness of about 150 μm. The viscosity of the UV curable coating material 15, the mesh size of the screen, and the like are adjusted so that the above thickness can be obtained by one screen printing. Then, the UV curable coating material 15 is irradiated with ultraviolet rays to be cured. UV-curable paint is different from other ordinary paints.
Since it is not dissolved in a solvent, its thick coating is easy
In the case of normal paint that can be made and is dissolved in a solvent, its hardness
UV curing type coating takes a few minutes to tens of minutes
In the case of, it is usually hard for about 10 seconds by irradiating with ultraviolet rays.
From these points, it is possible to shorten the manufacturing time.
It

Next, as shown in FIG. 4, the UV of the first layer is
A second layer of UV curable paint 17 is thickly applied onto the curable paint 15 by one screen printing so as to have a thickness of about 50 μm. In this case as well, the UV curable coating material 1 is used so that the above thickness can be obtained by one screen printing.
Adjust the viscosity of 7 and the mesh size of the screen.
Then, the UV curable coating material 17 is irradiated with ultraviolet rays to be cured. As a result, the thickness of the UV curable coating material is set to about 200 μm.

The first and second layers of UV-curable coating material 1
Although the thicknesses of 5 and 17 may be the same (for example, 100 μm in each case), the thickness of the first layer is increased in the above embodiment,
The reason for thinning the layers is as follows.

That is, if the thickness of the UV curable coating is to be increased, its viscosity must be increased and the mesh size of the screen to be printed must be increased.
However, in this way, the thickness can be increased, but the surface becomes rough. Therefore, U of the first layer
The viscosity of the V-curable paint 15 is adjusted to the second layer of the UV-curable paint 17
It is made thicker than the viscosity of to increase its thickness,
The viscosity of the UV curable coating material 17 of the second layer is made small and the mesh size of the screen is made fine so that the surface is smooth although the thickness is thin.

Next, as shown in FIG. 5, the film 10 and the cured UV-curable coating materials 15 and 17 are cut by pressing to remove the connector portion 1. The conductor pattern 11 (not shown) is formed by this press working.
At the same time, the flexible substrate constituted by the part is removed from the film 10.

The UV-curable coating which is thickly applied and cured as described above has a sufficient effect as a reinforcing plate, and in the case of the above-mentioned embodiment (the thickness of the UV-curable coating is 200 μm, the total thickness is 3).
It has been confirmed that the strength of the one having a thickness of 00 μm) is the same as that of the conventional example shown in FIG. 6 (having a thickness of the reinforcing plate 89 of 188 μm and a total thickness of 330 μm). Further, since the cured UV-curable coating material has no tackiness, dust does not adhere to it.

Next, FIGS. 6 to 10 are views showing a process of manufacturing a connector portion of a flexible board according to a second embodiment of the present invention, in which (a) is a plan view and (b) is a side sectional view. It is a figure (BB sectional drawing of Fig.6 (a)).

In order to manufacture the connector portion of this flexible board, first, as shown in FIG.
The conductor patterns 21 of the book are printed by screen printing, and at the same time, a large-area conductor land portion 23 connected to the conductor patterns 21 is printed on the end portions of the eight conductor patterns 21. Then, the insulating film 22 is printed on the conductor pattern 21 (however, the description of the insulating film 22 is omitted in the following figures).

Next, as shown in FIG. 7, the conductor land portion 2
A carbon film 25 is printed on the surface 3. In the drawing, the thickness of the conductor land portion 23 and the carbon film 25 is set to the film 20.
The thickness of the film 20 is substantially the same as that of the film 20, but in reality, it is considerably thinner than the film 20.

Next, as shown in FIG. 8, two layers of UV curable coating materials 27 and 28 are thickly applied and cured on the lower surface of the film 20, as in the first embodiment.

Next, as shown in FIG. 9, the film 20 and the cured UV-curable coatings 27 and 28 are cut at the portions indicated by the alternate long and short dash line by press working to remove the connector portion 2 as shown in FIG. Seven slits 29 are cut at the same time in the connector portion 2 cut at this time. The slits 29 separate each carbon film 25 and the conductor land portion 23 therebelow into eight, and each separated carbon Film 25 and conductor land portion 23
Are respectively connected to the conductor pattern 21.

Even with this structure, the connector portion 2
The tip portions of are connected by the connecting portion 30, and the UV curable coatings 27 and 28 are thickly applied and cured on the back surface thereof, so that the connector portion 2 can be sufficiently reinforced.

Further, in this embodiment, the connector portion 2
Since the outer shape of each of the slits and each slit 29 are formed by a single press cut, the dimensional accuracy is surely constant. Therefore, between the divided slits 29 and from the widthwise both ends of the connector portion 2 to each slit 29. The distance is constant, and even if the connector portion 2 is downsized, it can sufficiently cope with it.

In this embodiment, unlike the first embodiment, the tip end of the conductor land portion 23 (and the carbon film 25) that has been cut is not provided up to the tip end of the connector portion 2 (connector portion 2). There is a connecting portion 30 at the tip of the). Here, FIG. 13 is a view showing a female connector 50 into which the connector portion 2 is inserted. FIG. 13A is a plan view of the female connector 50 alone, and FIG. 13B is a sectional view taken along line HH of FIG. FIG. 1C is a sectional view when the connector section 2 is inserted into the female connector 50. As shown in the figure, the metal contact 51 in the female connector 50 does not contact the tip portion of the connector portion 2, but contacts at a position h separated from the tip by a predetermined length. Therefore, there is no problem even if the conductor land portion 23 (and the carbon film 25) is not provided up to the tip of the connector portion 2 as in the second embodiment.

The embodiment of the present invention has been described in detail above.
The present invention is not limited to these, and various modifications such as the following are possible.

[0031]

[0032] In each of the above embodiments, insulating paint (UV
(Curable paint) was applied twice to increase the thickness.
The invention is not limited to this,You may apply three or more times.

[0033]

[Effect of the Invention] As described above in detail, according to the connector portion of the flexible substrate according to the present invention, the following
It has an excellent effect. Unlike other ordinary paints, UV-curable paints are solvent
Since it is not melted, thick coating can be done easily.
Therefore, sufficient thickness can be obtained even with few layers,
The time can be shortened. Also, apply and harden the back surface of the film that constitutes the connector section.
Since the UV curable coating that has been turned into has no tackiness,
No dust is attached to this. Furthermore, change the thickness of the UV curable coating on the top layer to that of other layers.
Since it is thinner than the thickness of the UV curable paint,
Viscosity of UV-curable paint other than the top layer for thick coating
Even if the surface is roughened by increasing the
The viscosity of chemical type paint can be reduced and the surface can be made smooth easily.
can do.

[Brief description of drawings]

FIG. 1 is a diagram showing a process of manufacturing a connector portion of a flexible board according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a process of manufacturing the connector portion of the flexible substrate according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a process of manufacturing the connector portion of the flexible substrate according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a process of manufacturing the connector portion of the flexible substrate according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a process of manufacturing the connector portion of the flexible substrate according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a process of manufacturing a connector portion of a flexible board according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a process of manufacturing a connector portion of a flexible board according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a process of manufacturing a connector portion of a flexible board according to a second embodiment of the present invention.

FIG. 9 is a diagram showing a process of manufacturing a connector portion of a flexible board according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a process of manufacturing the connector portion of the flexible substrate according to the second embodiment of the present invention.

FIG. 11 is a diagram showing a connector portion 81 of a conventional flexible substrate.

FIG. 12 is a diagram showing a method for manufacturing a conventional connector section 81.

FIG. 13 is a view showing a female connector 50 into which the connector section 2 is inserted.

[Explanation of symbols]

 1, 2 Connector part 10, 20 Film 11, 21 Conductor pattern 13, 25 Carbon film 15, 17, 27, 28 UV curable paint (insulating paint) 23 Conductor land part 29 Slit

Claims (1)

[Claims] 1. A connector portion of a flexible substrate having a structure in which a conductor pattern is formed on a film made of synthetic resin, and a part of the conductor pattern is pulled out to an end portion of the film or in the vicinity of the end portion to form a connector portion . , Within a predetermined range on the back surface of the film that constitutes the connector section
Is a hard coating with at least two layers of UV curable paint
The UV-curable coating on the top layer that has been turned into
A connector part of a flexible board, which is thinner than UV curable paint .