KR20170103168A - Ultra Thin Type Flexible Flat Cable - Google Patents

Ultra Thin Type Flexible Flat Cable Download PDF

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Publication number
KR20170103168A
KR20170103168A KR1020160025574A KR20160025574A KR20170103168A KR 20170103168 A KR20170103168 A KR 20170103168A KR 1020160025574 A KR1020160025574 A KR 1020160025574A KR 20160025574 A KR20160025574 A KR 20160025574A KR 20170103168 A KR20170103168 A KR 20170103168A
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KR
South Korea
Prior art keywords
film
film portion
flat cable
layer
flexible flat
Prior art date
Application number
KR1020160025574A
Other languages
Korean (ko)
Inventor
황기남
강택형
이성목
고영훈
Original Assignee
(주)우주일렉트로닉스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)우주일렉트로닉스 filed Critical (주)우주일렉트로닉스
Priority to KR1020160025574A priority Critical patent/KR20170103168A/en
Publication of KR20170103168A publication Critical patent/KR20170103168A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0838—Parallel wires, sandwiched between two insulating layers

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an ultra-thin flexible flat cable which is thinly formed in an impedance matching unit and can be easily applied to slim electronic products. Since the impedance matching unit of the ultra-thin flexible flat cable according to the present invention is formed by depositing metal on the lower part of the film layer, the impedance matching unit can be formed to be ultra-thin and thus an ultra-thin flexible flat cable So that it is possible to easily mount them.

Description

Ultra Thin Type Flexible Flat Cable [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-thin flexible flat cable, and more particularly, to an ultra-thin flexible flat cable in which an impedance matching unit is formed to be thin and can be easily applied to a slim electronic product.

Today, as the demand for high speed data generation and processing increases, the ability to transmit data from one point to another is a measure of overall system performance, and in digital consumer electronics, Performance is directly related to performance, so efforts for improving performance of a data transmission system have been focused. In this regard, a low-voltage differential signaling (LVDS) solution capable of reducing power consumption by using a low voltage and capable of high-speed transmission is widely used.

LVDS is a general interface standard for high-speed data transmission, and is applied to various fields including data transmission systems of digital devices. Particularly, in a digital device such as a display device, a flexible flat cable (FFC) having low ductility and transmission characteristics and low manufacturing cost is widely used as a transmission medium for data transmission.

FIG. 1 is a plan view showing a conventional flexible flat cable, FIG. 2 is a cross-sectional view showing a conventional flexible flat cable, and FIG. 3 is a cross-sectional view showing an impedance matching unit of a conventional flexible flat cable.

Referring to FIGS. 1 and 2, a conventional flexible flat cable (FFC) 1 includes a signal transmission unit 10 and an impedance matching unit 20. The signal transmitting portion 10 is for transmitting data and includes a plurality of conductors 12 arranged in parallel, an upper insulating portion 13 surrounding the upper portion of the conductor 12, a lower insulating portion 13 surrounding the lower portion of the conductor 12, And a reinforcing film (15) formed on the lower portion of the lower insulating portion (14). When the upper insulating portion 13 covers the upper portion of the conductor 12, both longitudinal ends of the conductor 12 are exposed to the outside without covering the conductor 12.

Referring to FIG. 3, the impedance matching unit 20 is for impedance matching of the conductor 12, and is formed along the upper portion of the upper insulating unit 13. The impedance matching unit 20 includes a first film layer 21 such as PET (polyethylene terephthalate), a first film layer 21, and a second film layer 21, which are formed in six layers, A first adhesive layer 22 positioned between the first film layer 21 and the aluminum foil layer 23 and a second adhesive layer 22 formed under the first adhesive layer 22, A third film layer 25 such as CPP (casted polypropylene) formed on the lower portion of the second film layer 24 and a third film layer 25 formed on the lower side of the third film layer 25, And a second adhesive layer 26 formed on the second adhesive layer. The first film layer 21 is formed to be shorter than the upper insulating portion 13 and the second adhesive layer 26 is bonded to the upper portion of the upper insulating portion 13.

On the other hand, due to the slimming of electronic products such as tablet PCs and smart phones in recent years, the mounting space of the FFC 1 is becoming narrower. However, since the conventional impedance matching unit 20 is composed of six layers as described above, the impedance matching unit 20 has a large thickness. However, the impedance matching unit 20 has a problem in that it is incompatible with current trends toward thinning and shortening. Is required.

Korean Patent No. 10-1193906

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ultra-thin flexible flat cable in which an impedance matching unit is formed to be thin and can be easily applied to slim electronic products.

According to an aspect of the present invention, there is provided a display device comprising: a film portion formed in a long shape along a longitudinal direction; A plurality of conductors arranged along the inside of the film portion and having both ends exposed to the outside of the film portion; And an impedance matching unit formed along an upper side of the film unit to adjust the impedance of the conductive line, wherein the impedance matching unit comprises: a film layer formed in a long shape along the lengthwise direction of the film unit; A deposition layer of a metal material deposited on the lower side of the film layer; And a bonding layer formed on the lower side of the deposition layer to be coupled to the film portion.

Also, the deposition layer is formed by metallizing aluminum particles on the lower side of the film layer.

Also, the present invention provides an ultra-thin flexible flat cable, wherein the bonding layer is fused or bonded to the film portion.

In addition, the present invention provides an ultra-thin flexible flat cable, wherein both ends of the conductor exposed to the outside of the film portion are exposed in the same direction.

In addition, the present invention provides an ultra-thin flexible flat cable, wherein both ends of the conductor exposed to the outside of the film portion are exposed so as not to be mutually the same.

In addition, the present invention provides an ultra-thin flexible flat cable, wherein a distance between the deposition layer and the conductive line is set in proportion to a thickness of the deposition layer.

And a reinforcing film is further provided on the other side of the film portion when the end of the conductive line is exposed to the outside of the film portion through one side of the one end of the film portion.

Since the impedance matching unit of the ultra-thin flexible flat cable according to the present invention is formed by depositing metal on the lower part of the film layer, the impedance matching unit can be formed to be ultra-thin and thus an ultra-thin flexible flat cable So that it is possible to easily mount them.

1 is a plan view showing a conventional flexible flat cable.
2 is a cross-sectional view showing a conventional flexible flat cable.
3 is a cross-sectional view showing an impedance matching unit of a conventional flexible flat cable.
4 is a schematic cross-sectional view of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of an impedance matching unit included in an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.
6 is a view illustrating a distance between a conductor of a conventional flexible flat cable and an aluminum foil layer.
FIG. 7 is a view illustrating a distance between a conductive line and a deposition layer of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.
8 is a view schematically showing a side surface of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.
FIG. 9 is a graph showing a resistance value of a conventional flexible flat cable according to a time zone. FIG.
FIG. 10 is a graph illustrating resistance values of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.

Hereinafter, an ultra-thin flexible flat cable according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

4 is a schematic cross-sectional view of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.

Referring to FIG. 4, an ultra-thin flexible flat cable 100 according to a preferred embodiment of the present invention includes a signal transmission unit 110 and an impedance matching unit 120. The signal transmission portion 110 includes a film portion 112 and a lead 114 and may further include a reinforcing film 116.

The film portion 112 is formed in a long shape along the longitudinal direction and may be composed of a synthetic resin having insulation, resilience and flexibility, and may be made of, for example, polyethylene terephthalate (PET), polyethylene naphthalate naphthalate (PEN), polyphenylene ether (PPE), and the like. The film portion 112 includes an upper film portion 112a formed to cover an upper portion in the longitudinal direction of the lead 114 with reference to a lead 114 to be described later, And a lower film portion 112b formed thereon. The upper film portion 112a and the lower film portion 112b may be bonded to each other by using a heat seal adhesive or an adhesive, or may be integrally formed as the case may be.

The conductor 114 is formed of a conductive metal cable such as copper or tin through which electric power or electric signals flow, and a plurality of the conductor 114 are arranged in parallel in the longitudinal direction of the film portion 112. The cross section of the conductor 114 may be a round shape or a flat shape. The upper portion of the end portion of the lead wire 114 is exposed to the outside. For this purpose, the upper film portion 112a is formed to be shorter than the lead wire 114. A connector of an external electronic product (not shown) may be contacted to an end of the lead wire 114 exposed to the outside of the film portion 112.

The reinforcing film 116 is formed at both ends of the film portion 112 and at both ends of the lower film portion 112b. The reinforcing film 116 is made of polypropylene for reinforcing the strength of the film portion 112, , Polyethylene, polycarbonate, or the like, and may be formed of a conductive material or the like for connection to the ground (GND), as the case may be.

The impedance matching unit 120 is for impedance matching with a plurality of conductive lines 114 and is composed of three layers, and thus is relatively thin compared to a conventional impedance matching unit 20 (shown in FIG. 3). The impedance matching unit 120 will be described with reference to FIG.

FIG. 5 is a schematic cross-sectional view of an impedance matching unit included in an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.

4 and 5, the impedance matching unit 120 includes three layers, that is, a film layer 121, a vapor deposition layer 122, and a bonding layer 123.

The film layer 121 is formed in a long shape along the longitudinal direction of the upper portion of the upper film portion 112a. The film layer 121 is formed of synthetic resin or the like and may be formed of, for example, polyethylene terephthalate (PET).

The deposition layer 122 is formed by depositing metal on the lower side of the film layer 121, for example, by metallizing aluminum particles on the lower side of the film layer 121. Since the vapor deposition layer 122 made of aluminum is deposited on the lower side of the film portion 112 as described above, the vapor deposition layer 122 can be formed to be thin and relatively thin as compared with the conventional impedance matching portion 120 . Since the vapor deposition layer 122 is bonded to the upper film portion 112a by the bonding layer 123 to be described later, the entire size of the ultra-thin flexible flat cable 100 can be made thin, It is possible to easily mount the ultra-thin flexible flat cable 100 on the electronic product.

The bonding layer 123 is formed on the lower side of the deposition layer 122 so that the deposition layer 122 and the upper film portion 112a are fused or bonded so that the deposition layer 122 is bonded to the upper portion of the upper film portion 112a do.

FIG. 6 is a view for explaining the distance between the conductor of the conventional flexible flat cable and the aluminum foil layer, and FIG. 7 is a graph showing the distance between the conductor and the vapor deposition layer of the ultrathin flexible flat cable according to the preferred embodiment of the present invention Fig.

Referring to FIG. 6, in the conventional flexible flat cable 1, the thickness d2 of the aluminum foil layer 23 is formed to be slightly thick, for example, about 15 .mu.m. In order to set the impedance matching value in such a situation, the distance d1 between the aluminum foil layer 23 and the conductor 12 should be set to be longer in proportion to the thickness of the aluminum foil layer 23 formed to be relatively thick. A second film layer 24 such as PET and a third film layer 25 such as CPP are provided between the aluminum foil layer 23 and the conductor 12 so that the aluminum foil layer 23 and the conductor 12 ) Is relatively long, which causes the impedance matching portion 20 to be thickened.

7, the thickness D2 of the deposition layer 122 is about 1 mu m, for example, in the case of the ultra-thin flexible flat cable 100 of the present invention, compared with the conventional aluminum foil layer 23 It is formed to be extremely thin. Accordingly, in order to set the impedance matching value, it is necessary to set the distance D1 between the deposition layer 122 and the conductor 114 to be short in proportion to the thickness of the relatively thin deposition layer 122, The second film layer 24 and the third film layer 25 are not required and the thickness of the entire impedance matching portion 120 is significantly reduced.

8 is a view schematically showing a side surface of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.

8 (a), both ends of the conductor 114 exposed to the outside of the film portion 112 are exposed in the same direction, that is, toward the upper side. In this case, the reinforcing film 116 is positioned below both ends of the film portion 112.

8 (b), both ends of the lead 114 exposed to the outside of the film portion 112 are exposed so as not to be mutually the same. That is, one end of the lead 114 may be exposed to the outside through the upper side of one end of the film portion 112, and the other end of the lead 114 may be exposed to the outside through the lower side of the other end of the film portion 112 . In this case, the reinforcing film 116 positioned at one end of the film portion 112 is positioned below one end of the film portion 112 to reinforce the strength of the film portion 112, The reinforcing film 117 positioned at the end portion is positioned above the other end of the film portion 112 to reinforce the strength of the film portion 112. [

As described above, according to the internal environment of the digital device to which the ultra-thin flexible flat cable 100 is applied, the conductive part may be exposed to the outside of the film part 112 such that both ends of the conductive line 114 are directed to the same direction, May be exposed to the outside of the film portion 112 so as to face the same direction.

FIG. 9 is a graph showing a resistance value of a conventional flexible flat cable measured by time zone, and FIG. 10 is a graph illustrating a resistance value of an ultra-thin flexible flat cable according to a preferred embodiment of the present invention.

9 and 10, there is no difference between the graph of the impedance matching area of FIG. 9 and the graph of the impedance matching area of FIG. 10. The impedance matching unit 120 according to the present invention stably impedance-matches a signal without any difference compared to the impedance matching unit 20 (shown in FIG. 3) of the conventional flexible flat cable 1 Able to know. That is, even though the impedance matching unit 120 is formed to be thin as the three layers of the film layer 121, the vapor deposition layer 122, and the bonding layer 123, the ultrathin flexible flat cable 100 of the present invention can provide the impedance matching Is substantially similar to the conventional impedance matching unit 20.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It should be understood that the technical idea belonging to the scope of the claims also belongs to the present invention.

100: Ultra-thin Flexible Flat Cable
110: signal transmitting portion 112: film portion
112a: upper film portion 112b: lower film portion
114: conductor 116, 117: reinforced film
120: impedance matching unit 121: film layer
122: deposition layer 123: bonding layer

Claims (7)

A film portion formed in a long shape along the longitudinal direction;
A plurality of conductors arranged along the inside of the film portion and having both ends exposed to the outside of the film portion; And
And an impedance matching unit formed along the upper side of the film unit to adjust the impedance of the conductive line,
Wherein the impedance matching unit comprises:
A film layer formed in an elongated shape along an upper longitudinal direction of the film portion;
A deposition layer of a metal material deposited on the lower side of the film layer; And
And a bonding layer formed below the deposition layer to be bonded to the film portion.
The method according to claim 1,
Wherein the vapor deposition layer is formed by metallizing aluminum particles on the lower side of the film layer.
The method according to claim 1,
Wherein the bonding layer is fused or bonded to the film portion.
The method according to claim 1,
Wherein both ends of the conductor exposed to the outside of the film portion are exposed so as to face the same direction.
The method according to claim 1,
Wherein both ends of the conductor exposed to the outside of the film portion are exposed so as not to be mutually the same.
The method according to claim 1,
Wherein a distance between the deposition layer and the conductive line is set in proportion to a thickness of the deposition layer.
The method according to claim 1,
Wherein a reinforcing film is further provided on the other end of the film portion when the end of the lead wire is exposed to the outside of the film portion through one end of the one end of the film portion.
KR1020160025574A 2016-03-03 2016-03-03 Ultra Thin Type Flexible Flat Cable KR20170103168A (en)

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KR1020160025574A KR20170103168A (en) 2016-03-03 2016-03-03 Ultra Thin Type Flexible Flat Cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160025574A KR20170103168A (en) 2016-03-03 2016-03-03 Ultra Thin Type Flexible Flat Cable

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190072915A (en) 2017-12-18 2019-06-26 진영글로벌 주식회사 Flexible Flat Cable having Electromagnetic Wave Shielding Function and Manufacturing Method Thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190072915A (en) 2017-12-18 2019-06-26 진영글로벌 주식회사 Flexible Flat Cable having Electromagnetic Wave Shielding Function and Manufacturing Method Thereof

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