Patent Publication Number: US-2023154645-A1

Title: Flexible flat cable and method for manufacturing the same

Description:
TECHNICAL FIELD 
     The disclosure relates to a flexible flat cable and a method for manufacturing the flexible flat cable. 
     BACKGROUND ART 
     Electronic devices, such as smartphones, tablet PCs, and computers have been miniaturized, made slimmer, and equipped with multiple functions. 
     An electronic device may be used by mounting or connecting various electronic components, such as a processor, a memory, a speaker, a microphone, a sensor, a camera, an antenna, and/or a communication module on or to a printed circuit board (PCB) through a flexible printed circuit board (FPCB). 
     The PCB or the FPCB may include a cable that connects the above-described electronic components. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     The cables used for electronic devices are becoming thinner, and requests for shielding electromagnetic interferences (EMIs) of the electronic devices are increasing. 
     In order to satisfy the requests, a flexible flat cable EMI shielding layer may be included. The process of manufacturing a flexible flat cable includes a process of cutting a shape of the flexible flat cable. Then, a cross-section of the EMI shielding layer is exposed to the outside. 
     The EMI shielding layer may include a conductive material, and when a cross-section of the EMI shielding layer is exposed to the outside, the conductive material may be exposed to the outside. Accordingly, a short-circuit may be caused between an electronic component and a conductive material that are adjacent to the flexible flat cable. According to occasions, the conductive material of the EMI shielding layer exposed to the outside may be corroded. 
     Various embodiments of the disclosure provide a flexible flat cable having a structure that can solve the above-described problems by preventing a conductive material of an EMI shielding layer from being exposed to the outside, and a method for manufacturing the same. 
     Solution to Problem 
     A flexible flat cable according to various embodiments of the disclosure may include a first insulation layer having a plate shape, a first conductive pattern disposed on the first insulation layer, a second conductive pattern disposed on the first insulation layer to be spaced apart from the first conductive pattern at a predetermined interval, a second insulation layer covering at least a portion of the first conductive pattern and disposed on the first insulation layer to cover the second conductive pattern, a first shield member including a first shield layer disposed on the first insulation layer and the second insulation layer to cover the first conductive pattern and the second conductive pattern, and a second shield layer disposed on the first shield layer to cover the first shield layer, and a third insulation layer surrounding the first shield member such that at least a portion of the first shield layer of the first shield member, which is exposed between the first insulation layer and the second shield layer of the first shield member, is covered. 
     A method of manufacturing a flexible flat cable according to various embodiments of the disclosure may include pattering at least one first conductive pattern and at least one second conductive pattern on a first insulation layer having a plate shape, disposing a second insulation layer on the first insulation layer such that at least a portion of the at least one first conductive pattern and the second conductive pattern are covered, disposing the first shield member on the first insulation layer and the second insulation layer such that a first shield member including a first shield layer and a second shield layer covers the at least one first conductive pattern and the second insulation layer, disposing a third insulation layer on the first shield member and the first insulation layer such that at least a portion of the first shield layer of the first shield member, which is exposed between the first insulation layer and the second shield layer of the first shield member is covered, and cutting an outer shape of the flexible flat cable. 
     Various respective aspects and features of the invention are defined in the appended claims. Combinations of features from the dependent claims may be combined with features of the independent claims as appropriate and not merely as explicitly set out in the claims. 
     Furthermore, one or more selected features of any one embodiment described in this disclosure may be combined with one or more selected features of any other embodiment described herein, provided that the alternative combination of features at least partially alleviates the one or more technical problem discussed in this disclosure or at least partially alleviates a technical problem discernable by the skilled person from this disclosure and further provided that the particular combination or permutation of embodiment features thus formed would not be understood by the skilled person to be incompatible. 
     Two or more physically distinct components in any described example implementation of this disclosure may alternatively be integrated into a single component where possible, provided that the same function is performed by the single component thus formed. Conversely, a single component of any embodiment described in this disclosure may alternatively be implemented as two or more distinct components to achieve the same function, where appropriate. 
     It is an aim of certain embodiments of the invention to solve, mitigate or obviate, at least partly, at least one of the problems and/or disadvantages associated with the prior art. Certain embodiments aim to provide at least one of the advantages described below. 
     Advantageous Effects of Invention 
     According to various embodiments, a conductive material of an EMI shielding layer can be blocked from the outside. Accordingly, electronic component that has not been separately insulated can be disposed at a location that is adjacent to the flexible flat cable. 
     Further, a corrosion problem of a conductive material that may be included in an EMI shielding layer can be solved by blocking the conductive material of the EMI shielding layer from the outside. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
         FIG.  1    is a view of a shield member according to an embodiment of the disclosure; 
         FIG.  2    is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure; 
         FIG.  3 A  is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure; 
         FIG.  3 B  is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure; 
         FIG.  4    is a flowchart of a manufacturing method according to an embodiment of the disclosure; 
         FIG.  5    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  6    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  7    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  8    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  9    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  10    is a view illustrating a manufacturing method according to an embodiment of the disclosure; 
         FIG.  11    is a view illustrating a manufacturing method according to an embodiment of the disclosure; and 
         FIG.  12    is a view illustrating a manufacturing method according to an embodiment of the disclosure. 
     
    
    
     MODE FOR THE INVENTION 
     It should be appreciated that various embodiments of the disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. 
     With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. 
     As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     A shield unit may have a configuration of shielding electromagnetic interferences (EMIs). The shield unit may be a film having an EMI shielding function. In an embodiment of the disclosure, the shield unit, for example, may be a first shield member (e.g.,  250  of  FIG.  2   ) and a second shield member (e.g.,  270  of  FIG.  3 A ). The first shield member may include a first shield layer (e.g.,  251  of  FIG.  2   ) and a second shield layer (e.g.,  252  of  FIG.  2   ). The second shield member may include a third shield layer (e.g.,  271  of  FIG.  3 A ) and a fourth shield layer (e.g.,  272  of  FIG.  3 A ). 
       FIG.  1    is a view illustrating a configuration of a first shield member and a second shield member (hereinafter, shield members) included in a flexible flat cable according to an embodiment of the disclosure. 
     As illustrated in  FIG.  1   , the shield member may have a form in which a plurality of films are laminated. The shield member may include a shield layer  110 , a protection layer  130 , and a transport layer  150 . 
     The shield layer  110  may shield electromagnetic interferences (EMIs). The shield layer  110  may be formed of various materials. For example, the shield layer  110  may be formed of a conductive material. According to occasions, the shield layer  110  may be formed of a material containing metal powder, and may show characteristics of being conductive anisotropically or isotropically. The shield layer  110  may be formed through a metal sputtering scheme. The shield layer  110  may be formed of a conductive bonding material having an adhesive property. The shield layer  110  may be formed in a form in which two or more materials are laminated. For example, the shield layer  110  may be formed in a form in which a mesh copper layer and a conductive bonding material are laminated. 
     The protection layer  130  may protect the shield layer  110 . The protection layer  130  may be formed of an insulation material (e.g., a dielectric). The protection layer  130  may be formed in a form in which two or more materials are laminated. 
     The transport layer  150  may protect the shield member, and may be removed after the shield member is disposed. The transport layer  150  may be formed of a material, such as transport PET. 
     The above-described shield layer  110  may be a first shield layer  251  and a third shield layer  271  of the flexible flat cable according to various embodiments. The above-described protection layer  130  may be a second shield layer  252  and a fourth shield layer  272  of the flexible flat cable according to various embodiments. 
     As illustrated in  FIG.  1   , the shield layer  110  of the shield member may be exposed to the outside by cutting the shield member. For example, the shield layer  110  may be exposed to the outside on a side surface of the shield member. 
       FIG.  2    is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure. 
     Referring to  FIG.  2   , a flexible flat cable according to various embodiments may include a first insulation layer  210 , a first conductive pattern  220 , a second conductive pattern  230 , a second insulation layer  240 , a first shield member  250 , and a third insulation layer  260 . 
     The first insulation layer  210  may have a plate shape. The first insulation layer  210  may support other configurations of the flexible flat cable. The other configurations may be disposed on the first insulation layer  210  to form the flexible flat cable. The first insulation layer  210  may be formed of a material having an insulation property. For example, the first insulation layer  210  may be formed of a dielectric. 
     The first conductive pattern  220  may be disposed on the first insulation layer  210 . The first conductive pattern  220  may be formed of a conductive metal such that a current flows through the first conductive pattern  220 . The first conductive pattern  220  may be formed by etching a portion of a copper thin layer disposed on the first insulation layer  210 . As illustrated in  FIG.  2   , a plurality of first conductive patterns  220  may be provided on the first insulation layer  210  to be spaced apart from each other at a predetermined interval. The number of the first conductive patterns  220  may be variously changed if necessary. The first conductive pattern  220  may include at least one ground line. Hereinafter, it will be described that the first conductive pattern  220  is a ground line  220 . 
     The second conductive pattern  230  may be disposed on the first insulation layer  210 . The second conductive pattern  230  may be formed of a conductive metal such that a current flows through the second conductive pattern  230 . The second conductive pattern  230  may be formed by etching a portion of a copper thin layer disposed on the first insulation layer  210 . As illustrated in  FIG.  2   , the second conductive pattern  230  may be disposed to be spaced apart from the ground line  220  at a predetermined interval. Although  FIG.  2    illustrates that one second conductive pattern  230  is provided, the number of the second conductive patterns  230  may be variously changed if necessary. For example, two second conductive patterns  230  may be provided. The second conductive pattern  230  may include at least one signal transmission line that transmits an electrical signal. Hereinafter, it will be described that the second conductive pattern  230  is a signal transmission line  230 . The signal transmission line  230  may be used to transmit a low-speed signal or a high-speed signal. The low-speed signal may include at least one of an audio signal, a power signal, or a control signal. The high-speed signal may include a 5G communication signal, a Wi-Fi signal, an intermediate frequency (IF) signal, a Bluetooth signal, a USB signal, an HDMI signal, or an MIPI signal. In addition, the signal transmission line  230  may transmit various electrical signals. 
     The second insulation layer  240  may be formed of a material having an insulation property. For example, the second insulation layer  240  may be formed of a dielectric. The second insulation layer  240  may be disposed on the first insulation layer  210  to cover the ground line  220  and the signal transmission line  230 . As illustrated in  FIG.  2   , the second insulation layer  240  may cover a portion of the ground line  220 . According to various embodiments of the disclosure, the second insulation layer  240  may be disposed on the first insulation layer  210  to cover the entire ground line  220 . 
     The first shield member  250  may include a first shield layer  251  and a second shield layer  252 . As described above, the first shield layer  251  may be a conductive bonding material (e.g., the shield layer  110  of  FIG.  1   ). The second shield layer  252  may be a protection layer (e.g., the protection layer  130  of  FIG.  1   ) that protects the first shield layer  251 . 
     As illustrated in  FIG.  2   , the first shield layer  251  may be disposed on the first insulation layer  210  and the second insulation layer  240  to cover the second insulation layer  240 . As in  FIG.  2   , when the second insulation layer  240  is disposed to cover only a portion of the ground line  220 , the first shield layer  251  may cover the ground line  220 . The first shield layer  251 , which is a conductive bonding material, and the ground line  220  may be electrically connected to each other. The first shield layer  251  having an EMI shielding property may shield the signal transmission line  230  while surrounding the ground line  220  and the signal transmission line  230 . Accordingly, the signal transmission line  230  is in an EMI shielding state, and can prevent the signal transmitted to the signal transmission line  230  from being crossed. 
     The second shield layer  252  may be disposed on the first shield layer  251  to protect the first shield layer  251 . 
     The third insulation layer  260  may be formed of a material having an insulation property. For example, the third insulation layer  260  may be formed of a dielectric. The third insulation layer  260  is disposed to surround the first shield member  250 . Referring to  FIG.  2   , in a state in which the third insulation layer  260  surrounds the first shield member  250 , the third insulation layer  260  covers the first shield layer  251  exposed between the first insulation layer  210  and the second shield layer  252  of the first shield member  250 . For example, the third insulation layer  260  blocks the first shield layer  251  from the outside such that the first shield layer  251  is not exposed to the outside. 
     The flexible flat cable of the related art is configured such that the shield member that performs the EMI shielding function is disposed on the outermost side. If the outer shape of the flexible flat cable is cut, the conductive shield layer is exposed to the outside at a cross-sectional portion thereof. A design of disposing electronic components at a portion at which the shield layer is exposed, and an adjacent portion thereof is limited. This is because a short-circuit is caused between the shield layer and the electronic components. In the of the related art technology, at a side portion of the flexible flat cable and an adjacent portion thereof, an electronic component is not disposed, electronic components are disposed at a predetermined interval even though they are disposed, or a separate insulation process (e.g., a shielding can or an insulation tape) is necessary in an electronic component or the flexible flat cable. Due to the limitation, the arrangement of the electronic components is inefficiently designed, and costs increase due to a separate insulation process. According to occasions, the shield layer exposed to the outside may contact moisture, causing corrosion of the shield layer. 
     Because the flexible flat cable according to various embodiments is configured to block the first shield layer  251  from the outside, the above problems can be effectively solved. For example, in the flexible flat cable according to various embodiments of the disclosure, the arrangement of the electronic components is not limited due to the concern about a short-circuit. If necessary, the flexible flat cable may be disposed in a form in which the flexible flat cable and the electronic components contact each other in some sections. Because a separate insulation process is not necessary as the concern about a short-circuit between the flexible flat cable and the electronic components is not present. Because the first shield layer  251  is blocked from the outside, a problem of the first shield layer  251  corroding by the moisture introduced from the outside can be effectively solved. 
     Hereinafter, a lamination structure of the first shield member  250  and the third insulation layer  260  will be described below. 
     According to various embodiments of the disclosure, as illustrated in  FIG.  2   , opposite side ends of the first shield member  250  may be disposed to be spaced apart from opposite side ends of the first insulation layer  210 . The opposite side ends of the first shield member  250  may be disposed to be closer to the center of the flexible flat cable than to the opposite ends of the first insulation layer  210 . For example, the opposite ends of the first shield member  250  may be disposed on the inner sides of the opposite side ends of the first insulation layer  210 . 
     The third insulation layer  260  may be disposed on the first insulation layer  210  to be filled between the opposite ends of the first shield member  250  and the opposite ends of the first insulation layer  210 . In this state, a portion of the third insulation layer  260 , which contacts the first insulation layer  210 , may cover a side portion L of the first shield member  250 . As described above, the side portion L of the first shield member  250  is a portion, at which the first shield layer  251  is exposed to the outside. The flexible flat cable according to various embodiments may block the first shield layer  251  from the outside as the third insulation layer  260  covers the side portion L of the first shield member  250 . 
     Although it has been described above that the third insulation layer  260  covers the opposite side surfaces of the first shield member  250 , the third insulation layer  260  may be disposed on the first insulation layer  210  to cover only one of the opposite side surfaces of the first shield member  250 . A portion of the end of the first shield member  250  may coincide with the location of a portion of an end of the first insulation layer  210 . 
       FIG.  3 A  is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure. 
       FIG.  3 A  is a view of a flexible flat cable in a form in which an EMI shielding structure is applied to the opposite surfaces of the first insulation layer  210 . The first insulation layer  210  having a plate shape may include a first surface and a second surface corresponding to an opposite surface to the first surface. The configurations disposed on the first surface of the first insulation layer  210  are the same as those of the above-described embodiments of the disclosure, and the configurations disposed on the second surface of the first insulation layer  210  will be described. 
     A second shield member  270  and a fourth insulation layer  280  may be disposed on the second surface of the first insulation layer  210 . 
     The second shield member  270  may include a third shield layer  271  and a fourth shield layer  272 . The third shield layer  271  may have a configuration that is similar to that of the above-described first shield layer  251 . The third shield layer  271  may be formed of a conductive material that shields EMIs. For example, the third shield layer  271  may be a conductive bonding material (e.g., the shield layer  110  of  FIG.  1   ). The third conductive layer  271  may be disposed on the second surface of the first insulation layer  210 . The fourth shield layer  272  may have a configuration that is similar to that of the above-described second shield layer  252 . The fourth shield layer  272  may be a protection layer (e.g., the protection layer  130  of  FIG.  1   ) that protects the third shield layer  271 . 
     The fourth insulation layer  280  may be formed of a material having an insulation property. For example, the fourth insulation layer  280  may be formed of a dielectric. The fourth insulation layer  280  may be disposed to surround the second shield member  270  and may cover the third shield layer  271  exposed between the fourth shield layer  272  and the first insulation layer  210 . 
     As illustrated in  FIG.  3 A , opposite side ends of the second shield member  270  may be disposed to be spaced apart from opposite side ends of the first insulation layer  210 . The opposite side ends of the second shield member  270  may be disposed to be closer to the center of the flexible flat cable than to the opposite ends of the first insulation layer  210 . 
     The fourth insulation layer  280  may be disposed on the first insulation layer  210  to be filled between the opposite ends of the second shield member  270  and the opposite ends of the first insulation layer  210 . Accordingly, the fourth insulation layer  280  may cover the side portion L of the second shield member  270 . The fourth insulation layer  280  may block the third shield layer  271  of the second shield member  270  from the outside by covering the side portion L of the second shield member  270 . 
     Although it has been described above that the fourth insulation layer  280  covers the opposite side surfaces of the second shield member  270 , the fourth insulation layer  280  may be disposed on the first insulation layer  210  to cover only one of the opposite side surfaces of the second shield member  270 . A portion of the end of the second shield member  270  may coincide with the location of a portion of an end of the first insulation layer  210 . 
       FIG.  3 B  is a cross-sectional view of a flexible flat cable according to an embodiment of the disclosure. 
       FIG.  3 B  is a view of a flexible flat cable in a form in which an EMI shielding structure is applied to the opposite surfaces of the first insulation layer  210 . The first insulation layer  210  having a plate shape may include a first surface and a second surface corresponding to an opposite surface to the first surface. The configurations disposed on the first surface of the first insulation layer  210  are the same as those of the above-described embodiments of the disclosure, and the configurations disposed on the second surface of the first insulation layer  210  will be described. 
     In the flexible flat cable according to the embodiment of the disclosure, the configurations may be laminated while the second surface of the first insulation layer  210  is similar to the first surface thereof. However, as illustrated in  FIG.  3 B , a signal transmission line  230  disposed on the first surface may be omitted in the second surface of the first insulation layer  210 . A ground line  220  may be disposed on the second surface of the first insulation layer  210 . A fourth insulation layer  280  may be disposed on the second surface of the first insulation layer  210  to cover a portion of the ground line  220 . 
     As illustrated in  FIG.  3 B , opposite side ends of the second shield member  270  may be disposed to be spaced apart from opposite side ends of the first insulation layer  210 . The opposite side ends of the second shield member  270  may be disposed to be closer to the center of the flexible flat cable than to the opposite ends of the first insulation layer  210 . 
     The fifth insulation layer  290  may be disposed on the first insulation layer  210  to be filled between the opposite ends of the second shield member  270  and the opposite ends of the first insulation layer  210 . Accordingly, the fifth insulation layer  290  may cover the side portion L of the second shield member  270 . The fifth insulation layer  290  may block the third shield layer  271  of the second shield member  270  from the outside by covering the side portion L of the second shield member  270 . 
       FIG.  4    is a flowchart of a manufacturing method according to an embodiment of the disclosure.  FIG.  5    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  6    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  7    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  8    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  9    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  10    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  11    is a view illustrating a manufacturing method according to an embodiment of the disclosure.  FIG.  12    is a view illustrating a manufacturing method according to an embodiment of the disclosure. 
     Hereinafter, a method of manufacturing a flexible flat cable according to various embodiments will be described with reference to  FIGS.  4  to  12   .  FIGS.  4  to  12    illustrate only a process of manufacturing two flexible flat cables for convenience of description. An interval between the two flexible flat cables illustrated in  FIGS.  4  to  12    are exaggerated for convenience of description. 
     First, a first conductive pattern  220  and a second conductive pattern  230  may be patterned on the first insulation layer  210  in operation  410 . The first conductive pattern  220  may include at least one ground line, and the second conductive pattern  230  may include at least one signal transmission line  230 . Hereinafter, it will be described that the first conductive pattern  220  is a ground line  220  and the second conductive pattern  230  is a signal transmission line  230 . The ground line  220  and the signal transmission line  230  may be patterned in various methods. 
     For example, as illustrated in  FIG.  5   , the ground line  220  and the signal transmission line  230  may be patterned by etching the first insulation layer  210 , in which a conductor  500  is disposed. The conductor  500  disposed on the first insulation layer  210  may be a copper thin layer. According to occasions, the ground line  220  and the signal transmission line  230  may be patterned on the first insulation layer by using a printing technique. In this way, the ground line  220  and the signal transmission line  230  may be patterned by using various methods as illustrated in  FIG.  6   . 
     Next, as illustrated in  FIG.  7   , the second insulation layer  240  may be disposed on the first insulation layer  210  such that at least a portion of the ground line  220  and the signal transmission line  230  are covered (operation  420 . The second insulation layer  240  may cover the entire ground line  220 , and as illustrated in  FIG.  7   , the second insulation layer  240  may cover only a portion of the ground line  220 . 
     In this state, the first shield layer  250  may be disposed on the first insulation layer  210  and the second insulation layer  240  such that the first shield member  250  covers the ground line  220  and the second insulation layer  240  in operation  440 . After a portion of the first shield member  250  is cut, the cut first shield member  250  may be disposed on the first insulation layer  210  and the second insulation layer  240 . A portion of the first shield member  250  may be cut such that the opposite side ends of the first shield member  250  may be disposed to be closer to the center of the flexible flat cable than to the opposite ends of the first insulation layer  210  in operation  430 . 
     Referring to  FIG.  8   , a slit-shaped groove may be formed at the cut portion of the first shield member  250 . If the first shield member  250  cut in this way is disposed on the first insulation layer  210  and the second insulation layer  240  through the process illustrated in  FIG.  9   , as illustrated in  FIG.  10   , the opposite side ends of the first shield member  250  may be disposed to be spaced apart from the first insulation layer  210  at a predetermined interval. 
     In this state, a third insulation layer  260  may be disposed on the first shield member  250  and the first insulation layer  210  in operation  450 . 
     As illustrated in  FIG.  11   , the third insulation layer  260  disposed on the first insulation layer  210  may be filled between an end of the first shield member  250  and an end of the first insulation layer  210 . Accordingly, the first shield layer  251  of the first shield member  250  may be blocked from the outside by the third insulation layer  260 . 
     Next, as illustrated in  FIG.  12   , the process of manufacturing the flexible flat cable may be ended by cutting the outer shape of the flexible flat cable ( 460 ). 
     According to occasions, before the outer shape of the flexible flat cable is cut, a process of disposing the second shield member  270  and a fourth insulation layer  280  on the second surface of the first insulation layer  210  may be additionally performed. 
     First, a process of disposing the second shield member  270  will be described. The second shield member  270  may be disposed on the second surface of the first insulation layer  210 . Similarly to the above-described first shield member  250 , the second shield member  270  may be disposed on the first insulation layer  210  after the opposite ends of the second shield member  270  are cut. The opposite side ends of the second shield member  270  may be disposed to be closer to the center of the flexible flat cable than to the opposite ends of the first insulation layer  210 . 
     Next, a process of disposing the fourth shield member  280  will be described. The fourth insulation layer  280  may be disposed on the second shield member  270  and the first insulation layer  210 . Similarly to the above-described third insulation layer  260 , the fourth insulation layer  280  may be filled between an end of the second shield member  270  and an end of the first insulation layer  210 . Accordingly, the third shield layer  271  of the second shield member  270  may be blocked from the outside by the fourth insulation layer  280 . 
     A flexible flat cable according to a first embodiment of the disclosure may include a first insulation layer having a plate shape, a first conductive pattern disposed on the first insulation layer, a second conductive pattern disposed on the first insulation layer to be spaced apart from the first conductive pattern at a predetermined interval, a second insulation layer covering at least a portion of the first conductive pattern and disposed on the first insulation layer to cover the second conductive pattern, a first shield unit including a first shield layer disposed on the first insulation layer and the second insulation layer to cover the first conductive pattern and the second conductive pattern, and a second shield layer disposed on the first shield layer to cover the first shield layer, and a third insulation layer surrounding the first shield layer such that at least a portion of the first shield layer of the first shield unit, which is exposed between the first insulation layer and the second shield layer of the first shield unit is covered. 
     According to a flexible flat cable according to a second embodiment of the disclosure, in the flexible flat cable of the first embodiment or other embodiments of the disclosure, wherein the first conductive pattern includes at least one ground line. 
     According to a flexible flat cable according to a third embodiment of the disclosure, in the flexible flat cable of the first or second embodiment or other embodiments of the disclosure, the second conductive pattern may include at least one signal transmission line that transmits an electrical signal. 
     According to a flexible flat cable according to a fourth embodiment of the disclosure, in the flexible flat cable of the first to third embodiments or other embodiments of the disclosure, the first shield member may be configured such that at least a portion of an end of the first shield member is disposed to be spaced apart from an end of the first insulation layer at a predetermined interval and at least a portion of the end of the first shield member is disposed to be closer to the center of the flexible flat cable than to an end of the first insulation layer. 
     According to a flexible flat cable according to a fifth embodiment of the disclosure, in the flexible flat cable of the first to fourth embodiments or other embodiments of the disclosure, the third insulation layer may be disposed on the first insulation layer to fill a space between the end of the first shield member and the end of the first insulation layer to block the first shield layer of the first shield member, which is exposed between the first insulation layer and the second shield layer of the first shield member from the outside. 
     According to a flexible flat cable according to a sixth embodiment of the disclosure, in the flexible flat cable of the first to fifth embodiments or other embodiments of the disclosure, the first shield layer of the first shield member may be formed of a conductive material, and the first shield layer of the first shield member may be electrically connected to the first conductive pattern. 
     According to a flexible flat cable according to a seventh embodiment of the disclosure, in the flexible flat cable of the first to sixth embodiments or other embodiments of the disclosure, the first shield layer of the first shield unit may be formed of a conductive bonding material. 
     According to a flexible flat cable according to an eighth embodiment of the disclosure, in the flexible flat cable of the first to seventh embodiments or other embodiments of the disclosure, the first insulation layer may include a first surface, on which the first conductive pattern and the second conductive pattern are disposed, and a second surface corresponding to an opposite surface to the first surface, and the flexile flat cable may further include a second shield unit including a third shield layer disposed on the second surface of the first insulation layer and a fourth shield layer disposed on the third shield layer, and a fourth insulation layer surrounding the second shield unit such that at least a portion of the third shield layer of the second shield unit, which is exposed between the first insulation layer and the fourth shield layer of the second shield layer is covered. 
     According to a flexible flat cable according to a ninth embodiment of the disclosure, in the flexible flat cable of the eighth embodiment or other embodiments of the disclosure, the second shield unit may be configured such that at least a portion of an end of the second shield unit is disposed to be spaced apart from an end of the first insulation layer at a predetermined interval and at least a portion of the end of the second shield unit is disposed to be closer to the center of the flexible flat cable than to an end of the first insulation layer. 
     According to a flexible flat cable according to a tenth embodiment of the disclosure, in the flexible flat cable of the eighth or ninth embodiments or other embodiments of the disclosure, the fourth insulation layer may be disposed on the first insulation layer to fill a space between the end of the second shield unit and the end of the first insulation layer to block the third shield layer of the second shield unit, which is exposed between the first insulation layer and the fourth shield layer of the second shield unit from the outside. 
     According to a flexible flat cable according to an eleventh embodiment of the disclosure, in the flexible flat cable of the eighth to tenth embodiments or other embodiments of the disclosure, the third shield layer of the second shield unit may be formed of a conductive bonding material. 
     A method of manufacturing a flexible flat cable according to a first embodiment of the disclosure may include pattering at least one first conductive pattern and at least one second conductive pattern on a first insulation layer having a plate shape, disposing a second insulation layer on the first insulation layer such that at least a portion of the first conductive pattern and the second conductive pattern are covered, disposing the first shield unit on the first insulation layer and the second insulation layer such that a first shield unit including a first shield layer and a second shield layer covers the first conductive pattern and the second insulation layer, disposing a third insulation layer on the first shield unit and the first insulation layer such that at least a portion of the first shield layer of the first shield unit, which is exposed between the first insulation layer and the second shield layer of the first shield unit is covered, and cutting an outer shape of the flexible flat cable. 
     According to a method according to a second embodiment of the disclosure, in the method of the first embodiment or other embodiments of the disclosure, the disposing of the first shield unit may include cutting a portion of the first shield unit such that at least a portion of an end of the first shield unit is disposed to be spaced apart from an end of the first insulation layer at a predetermined interval and at least a portion of the end of the first shield unit is disposed to be closer to the center of the flexible flat cable than to an end of the first insulation layer. 
     According to a method according to a third embodiment of the disclosure, in the method of the first or second embodiment or other embodiments of the disclosure, the disposing of the third shield unit may include disposing the third insulation layer on the first insulation layer to fill the third insulation layer in a space between an end of the first shield unit and an end of the first insulation layer such that the first shield layer of the first shield unit, which is exposed between the first insulation layer and the second shield layer of the first shield layer, is blocked from the outside. 
     According to a method according to a fourth embodiment of the disclosure, in the method of the first to third embodiments or other embodiments of the disclosure, the first shield layer of the first shield unit may be formed of a conductive material, and the first shield layer of the first shield unit may be disposed to be electrically connected to the first conductive pattern. 
     According to a method according to a fifth embodiment of the disclosure, in the method of the first to fourth embodiments or other embodiments of the disclosure, the first shield layer of the first shield unit may be formed of a conductive bonding material. 
     According to a method according to a sixth embodiment of the disclosure, in the method of the first to fifth embodiment or other embodiments of the disclosure, the first insulation layer may include a first surface, on which the first conductive pattern and the second conductive pattern are disposed, and a second surface corresponding to an opposite surface to the first surface, the method may further include disposing a second shield unit including a third shield layer and a fourth shield layer disposed on the third shield layer on the second surface of the first insulation layer, and disposing a fourth insulation layer on the second shield unit and the first insulation layer such that at least a portion of the third shield layer of the second shield unit, which is exposed between the first insulation layer and the third shield layer of the second shield unit, is covered. 
     According to a method according to a seventh embodiment of the disclosure, in the method of the sixth embodiment or other embodiments of the disclosure, the disposing of the second shield unit may include cutting a portion of the second shield unit such that at least a portion of an end of the second shield unit is disposed to be spaced apart from an end of the first insulation layer at a predetermined interval and at least a portion of the end of the second shield unit is disposed to be closer to the center of the flexible flat cable than to an end of the first insulation layer. 
     According to a method according to an eighth embodiment of the disclosure, in the method of the sixth or seventh embodiment or other embodiments of the disclosure, the disposing of the fourth shield unit may include disposing the fourth insulation layer on the first insulation layer to fill the fourth insulation layer in a space between an end of the second shield unit and an end of the first insulation layer such that the third shield layer of the second shield unit, which is exposed between the first insulation layer and the fourth shield layer of the second shield layer, is blocked from the outside. 
     According to a method according to a ninth embodiment of the disclosure, in the method of the sixth to eighth embodiments or other embodiments of the disclosure, the third shield layer of the second shield unit may be formed of a conductive bonding material. 
     The embodiments disclosed in the disclosure disclosed in the specification and the drawings simply suggest specific examples to easily describe the technical contents according to the embodiments disclosed in the disclosure and help understanding of the embodiments disclosed in the disclosure, and are not intended to limit the scopes of the embodiments disclosed in the disclosure. Accordingly, it should be construed that the scopes of the various embodiments disclosed in the disclosure include all changes or modifications deduced based on the technical spirits of the various embodiments disclosed in the disclosure, in addition to the embodiments disclosed herein. 
     The scope of protection is defined by the appended independent claims. Further features are specified by the appended dependent claims. Example implementations can be realized comprising one or more features of any claim taken jointly and severally in any and all permutations. 
     The examples described in this disclosure include non-limiting example implementations of components corresponding to one or more features specified by the appended independent claims and these features (or their corresponding components) either individually or in combination may contribute to ameliorating one or more technical problems deducible by the skilled person from this disclosure. 
     Furthermore, one or more selected component of any one example described in this disclosure may be combined with one or more selected component of any other one or more example described in this disclosure, or alternatively may be combined with features of an appended independent claim to form a further alternative example. 
     Further example implementations can be realized comprising one or more components of any herein described implementation taken jointly and severally in any and all permutations. Yet further example implementations may also be realized by combining features of one or more of the appended claims with one or more selected components of any example implementation described herein. 
     In forming such further example implementations, some components of any example implementation described in this disclosure may be omitted. The one or more components that may be omitted are those components that the skilled person would directly and unambiguously recognize as being not, as such, indispensable for the function of the present technique in the light of a technical problem discernible from this disclosure. The skilled person would recognize that replacement or removal of such an omitted components does not require modification of other components or features of the further alternative example to compensate for the change. Thus further example implementations may be included, according to the present technique, even if the selected combination of features and/or components is not specifically recited in this disclosure. 
     Two or more physically distinct components in any described example implementation of this disclosure may alternatively be integrated into a single component where possible, provided that the same function is performed by the single component thus formed. Conversely, a single component of any example implementation described in this disclosure may alternatively be implemented as two or more distinct components to achieve the same function, where appropriate.