JP3114586B2 - Flexible printed circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible printed circuit in which a conductive pattern is sandwiched between sheet materials, and more particularly to a flexible printed circuit capable of securing a current capacity regardless of the width of the conductive pattern.

[0002]

2. Description of the Related Art Conventionally, after a wire harness of a bundle of wires has been prepared for electrical connection between electrical devices, the wires are connected to each terminal of an electrical device component. Therefore, in recent years, a flexible printed circuit in which a conductive pattern as an electric wire is sandwiched between sheet materials is often used.

[0003] This type of flexible print circuit is described in, for example, Japanese Utility Model Application No. 1-135758. In such a flexible printed circuit, as shown in FIG. 6, a connector 3 is previously attached to a connection portion 2 at an end of a conductive pattern 1 to be connected to an electric component and can be detached and attached at a time, thereby facilitating a connection operation. There are cases.

[0004]

However, in such a conventional flexible printed circuit, as shown in FIG. 7, the conductive pattern 1 is formed by punching a single copper plate 4 into an arbitrary shape. It is manufactured by sandwiching it between films (sheet materials), but the connecting portion 2 connected to the connector 3 or the like needs to have a narrow pattern width according to the terminal on the other side. However, although the current capacity is determined by the vertical cross-sectional area of the pattern, the thickness of the connection portion 2 is the same as the other portions of the conductive pattern 1 as shown in FIG. Despite having a large current capacity, there is a problem that heat is generated in the connection portion 2 depending on the amount of flowing current and cannot be adopted for a large current circuit.
Note that this problem also occurs when there is a portion other than the connection portion 2 where the amount of current flowing partially increases more than the other portion.

Accordingly, an object of the present invention is to partially increase the thickness of the conductive pattern, thereby securing a longitudinal cross-sectional area required for the conductive pattern and eliminating the limitation of the applicable range of the flexible printed circuit.

[0006]

For the purposes achieved SUMMARY OF THE INVENTION, The invention according to claim 1, wherein the conductive pattern electrically connecting the electrical component to a flexible printed circuit sandwiched by the sheet material, the conductive pattern At the end of
To connect the connector, narrow the end of the conductive pattern
The formed connection part is provided, and the connection part is defined as a part other than the connection part.
It is characterized in that it is formed to be thicker to secure a conductive cross-sectional area of the connection portion .

According to the first aspect of the present invention, the width is wider than others.
Connections that are narrowed are made thicker than others, and
The vertical cross-sectional area should be larger than when the thickness is the same as
And a vertical cross-sectional area equal to or more than the other.
Therefore, the current capacity at the narrow connection is equal to or greater than the other
It can be.

[0008] The invention of claim 2, wherein, in addition to the configuration of the invention according to claim 1 Symbol mounting, the connection portion of the conductive pattern, a plurality
Characterized by being formed in such a manner that the conductive materials are stacked in a state of being in close contact with each other.

According to the second aspect of the present invention, the contact of the conductive pattern is achieved only by stacking a plurality of conductive materials in close contact with each other.
The connecting portion can be made thick. For example, in the case of manufacturing by punching, in addition to a conductive material for forming a conductive pattern, prepared materials may be overlapped, and punching may be performed before and after the overlapping. Therefore, it can be easily manufactured. Contract
Motomeko 3 the described invention, in addition to the configuration of the invention according to claim 1 Symbol mounting, the connection portion of the conductive pattern, and the extension of the connecting portion
The conductive material is formed so as to be folded back and brought into close contact with each other.

According to the third aspect of the present invention, the conductive pattern is manufactured with the end portion extended, and the connection portion is overlapped and adhered simply by folding back the conductive material in the extended portion.
The connection portion of the conductive pattern can be made thick. Therefore, it can be easily manufactured.
Here, in addition to the connection portion of the conductive pattern , for example,
A similar configuration is used for parts that are formed narrower for design reasons, or where more current flows than others.
You can also.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 are views showing one embodiment of a flexible print circuit according to the present invention. In addition,
This embodiment corresponds to the first and second aspects of the present invention.
In FIG. 1, reference numeral 11 denotes a conductive pattern of a flexible printed circuit. The conductive pattern 11 is formed by punching a copper plate (conductive material) in accordance with a connection path or the like in order to electrically connect electric components of an electric device. (Sheet material). This conductive pattern 11
Is formed so that the connection portion 12 is aligned with the terminal position of the other party to be connected.In the present embodiment, the connection portion 12 is connected to the connector 13 to facilitate attachment and detachment.
It is formed narrower than the others to match the width between the 13 terminals.

The conductive pattern 11 is manufactured by punching a copper plate 14 having a thickness in consideration of the amount of flowing current. As shown in FIG. 2, a copper plate 15 is formed by overlapping a portion corresponding to the connection portion 12. Therefore, the connecting portion 12 of the conductive pattern 11 is formed to be narrow to connect to the connector 13, but the copper plate 15
Are formed on top of each other, so that the vertical cross-sectional area can be approximately twice as large as that of a single copper plate 14, and can be larger than other vertical cross-sectional areas.

As described above, in the present embodiment, the connecting portion 12 formed narrower than the conductive pattern 11 is formed by laminating the copper plate 15, so that the same or more current capacity as the other portions can be secured. In addition, it is possible to prevent the connection section 12 from generating heat. Therefore, the connectable range is not limited by the current capacity of the connection portion 12, and the connection can be made to a large current circuit in accordance with another portion of the conductive pattern 11.

Further, since the connecting portion 12 only partially overlaps the copper plate 15 on the copper plate 14 for forming the conductive pattern 11, the overall weight and cost are not unnecessarily increased. Further, as a first other aspect of the present embodiment, as shown in FIGS. 3 and 4, the connection portion 12 formed at the end of the conductive pattern 11 is formed by adding a length obtained by adding the extension portion 22 from the copper plate 14. After the punching, the extension 22 may be folded back so as to overlap. By doing so, the connecting section 12 of the conductive pattern 11 can be formed to have a vertical cross-sectional area that is approximately twice as large as that of a case where the connecting section 12 is made of one copper plate 14, and the same operation and effect as the above-described embodiment can be obtained. . The other aspects correspond to the invention described in claim 3 .

Further, as another second embodiment, as shown in FIG. 5, a connecting portion 12 formed at an end of the conductive pattern 11 is formed.
Cut by extending the conductive pattern 11 with the same width
An adjacent portion 32 adjacent via 31 may be stamped out of the copper plate 14 and then folded to overlap.
By doing so, the connection portion of the conductive pattern 11
The vertical cross-sectional area can be made approximately twice as large as that of the case where the copper sheet 12 is made of one copper plate 14, and the same operation and effect as the above-described embodiment can be obtained. The other aspect also corresponds to the invention described in claim 3 , and the reason why the adjacent portion 32 is longer than the connection portion 12 is that the adjacent portion 32 is shorter by the amount of folding.

In the present embodiment, an example in which the present invention is applied to the connection portion 12 at the end of the conductive pattern 11 has been described. A portion requiring a large current capacity may be manufactured by stacking the copper plate 15 or folding the copper plate 14, so that the current capacity of that portion can be secured. In the present embodiment,
Although the case of connecting to the connector 13 has been described, it goes without saying that the same applies to the case of directly connecting to the terminal of an electric device, and also to the case of a conductive pattern formed by screen printing on a substrate. It can be applied and partial screen printing may be performed multiple times.

[0017]

According to the first aspect of the present invention, compared to the others,
Even when connecting to a connector designed to be narrow,
The same or more vertical cross-sectional area can be used.
The current capacity in one part can be secured, and the applicable range can be adjusted to other parts.

According to the second aspect of the present invention, since a plurality of conductive materials are merely superposed and brought into close contact with each other, they can be easily manufactured, and the weight and cost do not increase.

According to the third aspect of the present invention, the extended conductive material is overlapped and brought into close contact only by being folded back, so that it can be easily manufactured, and the weight and cost do not increase.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of an embodiment of a flexible print circuit according to the present invention, wherein (a) is a plan view thereof, and (b) is a partial longitudinal sectional view thereof.

FIG. 2 is an explanatory diagram for each process for explaining the fabrication.

FIG. 3 is a diagram showing the first other mode, and is an explanatory diagram for explaining a manufacturing process thereof.

FIG. 4 is a longitudinal sectional view of one manufactured in the step shown in FIG.

FIG. 5 is a view showing the second other mode, and is an explanatory view for explaining a manufacturing process thereof.

6A and 6B are diagrams showing a main part of the conventional example, in which FIG. 6A is a plan view and FIG. 6B is a partial longitudinal sectional view.

FIG. 7 is an explanatory diagram for each process for explaining the fabrication.

[Explanation of symbols]

 11 Conductive pattern 12 Connection part 13 Connector 14, 15 Copper plate (conductive material) 22 Extension part 32 Adjacent part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 1/11 H01B 7/08 H01R 12/28 H05K 1/02

Claims (3)

(57) [Claims] 1. A flexible printed circuit in which a conductive pattern for electrically connecting electrical components is sandwiched by a sheet material, wherein the conductive pattern is used to connect a connector to an end of the conductive pattern.
A connecting portion having a pattern end portion formed in a narrow width is provided, and the connecting portion is formed to be thicker than portions other than the connecting portion.
A flexible printed circuit characterized by ensuring a continuous cross-sectional area of a connecting portion . 2. The method according to claim 1, wherein the connecting portion of the conductive pattern is provided with a plurality of conductive patterns.
The flexible printed circuit according to claim 1, wherein the flexible printed circuit is formed by stacking electrical materials in close contact with each other . 3. A connection part of the conductive pattern ,
Fold the extended conductive material so that it adheres tightly
The flexible printed circuit according to claim 1 or 2, characterized in that the formed.