KR20220001721U - Narrow pitch flexible flat cable - Google Patents

Abstract

The present invention includes a plurality of conductors and a bonding layer, each of the plurality of conductors has a conductive part and a connection part, the cross-section of the plurality of conductors located in the conductive part is circular, and the plurality of conductors located in the connection part are flat. , the plurality of conductors positioned in the conductive portion are spaced apart by a predetermined distance, each of the plurality of conductors has a wire diameter, the bonding layer has insulating properties, the bonding layer is provided with a bonding portion and an opening, and the bonding portion is provided in the conductive portion Provided is a narrow-pitch flexible flat cable joined to the plurality of conductors positioned therein, and the openings correspond to the plurality of conductors positioned in the connection part, and the openings exposing the plurality of conductors in a flat shape.

Description

Narrow Pitch Flexible Flat Cable {NARROW PITCH FLEXIBLE FLAT CABLE}

The present invention relates to the technical field of flat conductors, and in particular, to a narrow pitch flexible flat cable.

In the conventional flat cable for electrical connection, it can be generally divided into a flexible flat cable (FFC) and a flexible printed circuit board (FPC) according to the method, and the former is flat in a bonding method. sealing the shaped pure copper conductor or nickel-plated flat conductor to the insulating layer; The latter is to form the flat-shaped conductors of the printed circuit board by etching.

Flexible flat conductors and flexible printed circuit boards each have their own advantages. Comparing the two, since the flexible flat conductor does not need to undergo a chemical etching manufacturing process, chemical contamination can be reduced and the cost is relatively low, but in order to withstand high pressure (about 150 to 500 volts) and have insulating properties, The distance between conductors is usually set to be greater than 0.13 mm. However, since the flexible flat conductor has a conductor width of 0.3 mm, the pitch between the conductor and the conductor is the smallest, reaching only 0.5 mm, and cannot enter the 0.4 mm pitch application, but the flexible printed circuit board is etched Conductors smaller than the width of the conductors described above can be obtained in such a way that the conductor-to-conductor pitch of the flexible printed circuit board is limited to within the range of 0.4 mm, however, as mentioned above, the flexible printed circuit board is etched Since the conductor is formed only in this way, compared with the manufacturing process of the flexible flat conductor, the cost is high and there is a risk of environmental pollution.

In consideration of this, the present invention provides a narrow pitch flexible flat cable to solve the problems or unresolved problems of conventional flexible flat conductors and flexible printed circuit boards.

The first object of the present invention is to provide a narrow-pitch flexible flat cable to realize a narrow-pitch (eg 0.4 mm) flexible flat cable with withstand voltage insulation without using an etching technique.

A second object of the present invention is to provide a distance (eg, greater than or equal to 0.28 mm) that has sufficient withstand voltage and is insulated between adjacent conductors according to the narrow-pitch flexible flat cable.

A third object of the present invention is to form a flat conductor by partially compressing a cylindrical shape according to the narrow-pitch flexible flat cable, and to connect it to a connector or a circuit board.

In order to achieve the above and other objects, the present invention provides a narrow pitch flexible flat cable. Narrow pitch flexible flat cables include multiple conductors and bonding layers. Each of the plurality of conductors has a conductive part and a connecting part, the cross-section of the plurality of conductors positioned in the conductive part is circular, the plurality of conductors positioned in the connection part have a flat shape, and a predetermined distance is provided between the plurality of conductors positioned in the conductive part the plurality of conductors spaced apart and each having a wire diameter, the bonding layer having insulating properties, the bonding portion having an opening, the bonding portion being bonded to the plurality of conductors located in the conducting portion and the opening being located in the connecting portion; Corresponds to the plurality of conductors, and the opening exposes the plurality of conductors in a flat shape.

In one embodiment, the range of the sum of the wire diameter and the distance between the plurality of adjacent conductors is 0.4 millimeters (mm), and the distance and the wire diameter each have an error range within 0.1 mm.

In one embodiment, a pitch range of each of the plurality of conductors adjacent to each other positioned in the conductive portion is 0.4 mm, and the pitch has an error range of 0.1 mm.

In one embodiment, the wire diameter of each of the plurality of conductors located in the conducting portion is 0.12 mm.

In one embodiment, the distance of the plurality of conductors adjacent to each other located in the conductive portion is 0.28 mm.

In one embodiment, the width of each of the plurality of conductors positioned in the connection portion is 0.27 mm, and the width has an error range of 0.1 mm.

In one embodiment, each of said plurality of conductors positioned between the conductive portion and the connecting portion has a Y-shaped tapered shape.

In one embodiment, the plurality of conductors located in the connection part are compressed by crimping each of the plurality of conductors having a circular cross section into the plurality of conductors having a flat shape by a crimping method, so that each of the plurality of conductors located in the conductive part is It is made into a cylinder body, and each of said plurality of conductors located in the connection part is made to be a flat conductor.

Compared with the prior art, the narrow pitch flexible flat cable provided in the present invention can reach the advantage of manufacturing the narrow pitch flexible flat cable with a flexible printed circuit board without etching the flexible flat conductor.

1 is a structural schematic diagram of a narrow pitch flexible flat cable according to an embodiment of the present invention.
2 is a cross-sectional view A-A' for explaining the narrow-pitch flexible flat cable of FIG. 1 of the present invention.
3 is a B-B' cross-sectional view illustrating the narrow-pitch flexible flat cable of FIG. 1 of the present invention.
4 is an enlarged schematic diagram illustrating the conductor of FIG. 1 of the present invention.

In order to fully understand the purpose, features and effects of the present invention, the present invention will be described in detail in conjunction with the following specific examples in conjunction with the accompanying drawings.

In the present invention, the units, elements and assemblies described in the text as “one” or “one” are described. This is only for convenience of description and provides a common meaning for the scope of the present invention. Accordingly, unless expressly stated otherwise, this description is to be understood inclusive of one or at least one, and the singular also includes the plural.

In the present invention, the terms “comprising”, “inclusive”, “including”, “containing” or any other similar terms are meant to include non-exclusive inclusions. For example, a device, structure, product, or device comprising a plurality of components is not limited to the components listed herein, but includes other components not listed, but where the device, structure, product, or device is typically unique. can do. In addition, unless clearly stated otherwise, the term “or” means an inclusive “or” and not an exclusive “or”.

Referring to FIG. 1, it is a structural schematic diagram of a narrow pitch flexible flat cable according to an embodiment of the present invention. In FIG. 1 , a narrow pitch flexible flat cable 10 includes a conductor 12 and a bonding layer 14 .

In this embodiment, the number of conductors 12 is described as four, and in another embodiment, the number of conductors 12 may be more or less than four. Here, the conductor 12 has a conductive part 122 and a connection part 124, and in addition, in order to distinguish the conductor 12 located in the conductive part 122 and the connection part 124, the conductor 12' ( Conducting portion 122) and conductor 12″ (located at connection portion 124) are respectively defined. Connection portion 124 is located at the end of narrow pitch flexible flat cable 10, i.e., as shown in FIG. On the right side, the conducting portion 122 is not located at the end of the narrow pitch flexible flat cable 10, i.e., the left side of Figure 1. Accordingly, the connection portion 124 is described as one side and in another embodiment: There may be two connection parts 124 and are respectively installed at both ends of the conductive part 122 .

Referring in conjunction with FIG. 2, it is a cross-sectional view A-A' illustrating the narrow-pitch flexible flat cable of FIG. 1 of the present invention. It will be understood that in FIG. 2 , the cross section of the conductor 12' located in the conductive portion 122 is circular (which may be round, oval, etc.), and the conductor 12" located in the connecting portion 124 has a flat shape. Also, with reference to Fig. 3, it is a B-B' cross-sectional view illustrating the narrow-pitch flexible flat cable of Fig. 1 of the present invention. In Fig. 3, the conductor 12 located in the conducting part 122' It can be understood that the cross section of is circular.

In order to arrive at the structure described above, the cylindrical conductor 12 located in the connecting portion 124 is pressed into a flat conductor 12”, and the conductor 12” of the connecting portion 124 and the conductive portion 122 are pressed. The conductor 12' between the conductors 12' has changed from a cylindrical shape to a flat shape, so that the conductor 12 between the connecting portion 124 and the conductive portion 122 has a Y-shaped tapered shape. In other words, the conductor 12 "located in the connection part 124" is compressed by crimping the conductor 12 having a circular cross-section into the flat conductor 12" by a crimping method, and the conductor 12 positioned in the conductive part 122 is pressed. )' is a cylinder, and the conductor 12" located in the connection part 124 is a flat conductor.

Referring in conjunction with FIG. 4, it is an enlarged schematic diagram illustrating the conductor of FIG. 1 of the present invention. As shown in FIG. 4 , a distance d between the conductors 12' positioned in the conductive part 122 is provided, and the conductor 12' has a wire diameter (ø), and the cross section of the conductor 12' is circular. In this case, the wire diameter ? may be the diameter of the conductor 12', for example, the diameter of the wire diameter ? is 0.12 mm. In one embodiment, the range of the sum of the wire diameter ø and the distance d between adjacent conductors 12' is 0.4 millimeters (mm), and the conductor 12' located adjacent to the conductive portion 122' The range of the pitch P may be 0.4 mm. Accordingly, the pitch P refers to the distance between the center of the conductor 12 and the center of the adjacent conductor 12 . In another embodiment, the wire diameter (ø), distance (d) and pitch (P) each have an error within 0.1 mm. Therefore, the error range of the wire diameter ø may be between 0.02 mm and 0.22 mm, and the error may be two decimal places; The error range of the distance d may be between 0.38 mm and 0.18 mm, and the error may be two decimal places; The error range of the pitch P may be between 0.3 mm and 0.5 mm, and the error may be two digits after the decimal point. Except for the fixed values or ranges of values exemplified above, if the cross section of the conductor 12' of the conductive part 122 is circular and the conductor 12" located in the connection part 124" has a flat shape, any size can be It should be noted that all fall within the scope of the present invention.

For example, in the present embodiment, the diameter of the wire diameter ? of the conductor 12' located in the conductive portion 122 will be described with reference to 0.12 mm as an example. When the diameter of the wire diameter (ø) is 0.12 mm, if the pitch P is set to 0.4 mm (that is, the narrow pitch referred to in the present invention), the distance d can reach 0.28 mm, and the conventional Compared to that the distance of the flexible flat conductor is 0.13 mm, the narrow pitch of this embodiment can have a relatively wide distance, so that the narrow pitch flexible flat cable 10 of this embodiment has a higher voltage (or referred to as a working voltage) Similarly, in the case of the same narrow pitch as that of a conventional flexible printed circuit board, this embodiment does not require any etching process. It should be noted that although the conductive portion 122 can withstand high voltages, if the entire narrow pitch flexible flat cable 10 is to withstand high and low voltages, further consideration must be given to the connection 124 to withstand high and low voltages. do. For example, the high and low of the internal pressure of the connection part 124 is related to the distance d' between the adjacent conductors 12" located in the connection part 124, and in this embodiment, located in the connection part 124 The width of the conductor 12" may be, for example, 0.27 mm, the width has a margin of error within 0.1 mm, such that the error range of the width is between 0.37 mm and 0.17 mm, and the error is two decimal places. to be.

Referring back to FIG. 2 , the bonding layer 14 has insulating properties, and for example, the material of the bonding layer 14 may be polyethylene terephthalate (PET or PETE). In this embodiment, the bonding layer 14 is composed of two layers of polyethylene terephthalate. When polyethylene terephthalate is respectively installed on the corresponding side of the conductor 12 (ie, the upper side and the lower side in FIG. 2 ), it is bonded to the polyethylene terephthalate on the corresponding side, so that the conductor 12 is wrapped in the bonding layer 14 . And, thus defining the bonding portion 142, it can be installed to correspond to the conductive portion 122, and referring to FIG. 1, in addition to the bonding portion 142 provided in the bonding layer 14, the opening 144 is further Included. The opening 144 corresponds to the conductor 12" located in the connection part 124, is for exposing the flat-shaped conductor 12", and is for connecting an external connector or a circuit board.

Although the present invention has been disclosed as a more preferred embodiment above, those of ordinary skill in the art should understand that the embodiments are only for explaining the present invention and not limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to the embodiment should be included in the scope of the present invention. Accordingly, the scope of protection of the present invention is based on the claims.

10: Narrow Pitch Flexible Flat Cable 12, 12', 12": Conductor
122: conduction part 124: connection part
14: bonding layer 142: bonding portion
144: opening d、d': distance
ø: wire diameter P: pitch

Claims (10)

A narrow pitch flexible flat cable comprising a plurality of conductors and a bonding layer, comprising:
The plurality of conductors include a conductive part and a connection part, a cross section of the plurality of conductors positioned in the conductive part is circular, and the plurality of conductors positioned in the connection part have a flat shape, and a predetermined distance is provided between the plurality of conductors positioned in the conductive part. spaced apart, each said plurality of conductors having a wire diameter;
The bonding layer has insulating properties, and has a bonding portion and an opening, wherein the bonding portion is joined to the plurality of conductors located in the conductive portion, and the opening corresponds to the plurality of conductors located in the connection portion and has a flat shape. A narrow pitch flexible flat cable exposing the plurality of conductors. The method according to claim 1, wherein the range of the sum of the distance and the wire diameter between the plurality of adjacent conductors is 0.4 mm, the distance and the wire diameter each have an error range within 0.1 mm, and the wire diameter is 0.12 mm, the error range of the wire diameter is between 0.02 mm and 0.22 mm, the error is two decimal places, and the error range of the distance is between 0.38 mm and 0.18 mm. According to claim 1, wherein the range of the pitch of the plurality of conductors adjacent to each other positioned in the conductive portion is 0.4 mm, the pitch has an error range within 0.1 mm, and the error range of the pitch is 0.3 mm to 0.5 mm narrow pitch flexible flat cable. The method according to claim 1, wherein the wire diameter of each of the plurality of conductors positioned in the conductive portion is 0.12 mm, the wire diameter has an error range of 0.1 mm, respectively, and the error range of the wire diameter is 0.02 mm to 0.22 mm Narrow pitch flexible flat cable to be between mm. According to claim 1, wherein the distance of the plurality of conductors adjacent to each other positioned in the conductive portion is 0.28 mm, the distance has an error range within 0.1 mm, narrow such that the error range of the distance is between 0.38 mm to 0.18 mm Pitch flexible flat cable. According to claim 1, wherein the width of each of the plurality of conductors positioned in the connecting portion is 0.27 mm, the width has an error range within 0.1 mm, narrow such that the error range of the width is between 0.37 mm and 0.17 mm Pitch flexible flat cable. The narrow pitch flexible flat cable of claim 1 , wherein at least one of the wire diameter, the distance and the pitch optionally has an error within 0.1 mm. The narrow-pitch flexible flat cable according to claim 1, wherein each of the plurality of conductors positioned between the conductive part and the connecting part has a Y-shaped taper shape. The narrow-pitch flexible flat cable according to claim 1, wherein the connection part is two, and is installed at both ends of the conductive part, respectively. The method according to claim 1, wherein the plurality of conductors located in the connecting portion are compressed by crimping each of the plurality of conductors having a circular cross section into the plurality of conductors having the flat shape, each of the plurality of conductors located in the conductive portion A narrow pitch flexible flat cable in which a plurality of conductors are cylindrical and each of the plurality of conductors positioned in the connecting portion is a flat conductor.

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