KR100938275B1 - Flat Hihg-Definition Multimidia Interface cable - Google Patents

Abstract

The present invention relates to a flat high-definition multimedia interface cable, and more particularly, parallel to the signal line and the ground line for transmitting audio and video signals to form a flat HDMI cable, a shielding film formed of a multilayer structure of polyester and aluminum The present invention relates to a flat high-definition multimedia interface cable capable of securing signal interference and signal transmission strength between signal lines and enabling an automated process to improve work productivity.

The flat high definition multimedia interface cable according to the present invention is a high definition multimedia interface (HDMI) cable for simultaneously transmitting a video signal and an audio signal (TMDS), and a plurality of signal lines and a ground line for transmitting the TMDS are arranged in parallel with each other. Comprised of a plurality of first groups consisting of two signal lines and one ground line arranged, a plurality of signal lines for transmitting power and control signals is composed of one second group arranged in parallel with each other, The first group and the second group are arranged side by side in parallel with each other, the plurality of first group and the second group is characterized in that it is configured to be isolated from the adjacent group surrounded by a shielding film containing aluminum, respectively. .

High Definition Multimedia Interface (HDMI) Cable, Twist, Flat, Shield

Description

Flat high-definition multimedia interface cable {Flat Hihg-Definition Multimidia Interface cable}

The present invention relates to a flat high-definition multimedia interface cable, and more particularly, parallel to the signal line and the ground line for transmitting audio and video signals to form a flat HDMI cable, a shielding film formed of a multilayer structure of polyester and aluminum The present invention relates to a flat high-definition multimedia interface cable capable of securing signal interference and signal transmission strength between signal lines and enabling an automated process to improve work productivity.

In general, a high-definition multimidia interface (HDMI) is a typical standard for video and audio signal transmission. Digital and audio signals can be converted into one video and audio signal cable without compression. Transmission standard that can be connected to the product.

In particular, since video and audio signal transmission cables are capable of multichannel transmission (5.1 channels) for audio signals, they are smaller in size than digital video interface (DVI) cables and have a copyright protection standard called High Bandwidth Digital Content Protection (HDCP). Since it is built-in, it should be HDCP certified between player and display for normal video output, and because multi-channel audio is also supported, DVI cable is used only for home appliances, while HDMI cable is used for audio and video home appliances. Can be.

The cable according to the HDMI standard has video and audio lines on the same cable, and in particular, a signal line for transmitting a video signal and an audio signal (hereinafter referred to as TMDS (Transtion Minimized Differential Signaling)) and a signal line for power and control. It is constructed and covered.

1 is a perspective view showing the configuration of an HDMI cable according to the prior art, Figure 2 is a view showing the signal line arrangement inside the HDMI cable according to the prior art.

The HDMI cable consists of 12 signal and ground lines divided into four groups for transmitting video and audio signals, and seven signal lines for power and control signals, surrounded by an aluminum shield and a cable jacket. At this time, the 12 signal lines and the ground line transmitting TMDS are composed of four core wires surrounded by a red sheath, four core wires surrounded by a white sheath, and four uncoated bare cores, respectively. The red signal line and the white signal line are twisted with each other to ensure signal interference and signal transmission strength. Since the HDMI cable has to transmit high-capacity data at high speed, the signal lines must satisfy the signal interference and signal transmission strength characteristics of each other, and for this purpose, the signal lines have to be twisted realistically.

However, the HDMI cable according to the prior art connects the sockets at both ends for connection with other electronic devices. To this end, the twisted signal lines need to be unwound again. It is necessary to check the signal line visually and visually to select the signal line that meets the characteristics. Since each signal line must be soldered by hand, automated production suitable for mass production is impossible and productivity is lowered, thereby securing cost competitiveness. .

In addition, since the HDMI cable has a plurality of signal lines together to form a circular shape, when the floor is close to the construction, the thickness is so thick that it is difficult to finish the construction, and when stepped on, the electrical characteristics may change due to structural distortion. have.

The present invention is to solve the above problems, the signal line and ground line for transmitting the TMDS constituting the HDMI cable and the signal line for power and control signal transmission arranged in parallel with each other, a multilayer structure of polyester and aluminum By forming a shielded film consisting of a flat HDMI cable to satisfy the signal interference and signal transmission strength characteristics between the signal lines and at the same time to enable the automation of the soldering process for the connection to the socket connected to both ends of the HDMI cable productivity It is an object of the present invention to provide a flat high-definition multimedia interface cable that can improve the performance and minimize the defect rate.

In addition, the present invention is to solve the above problems, after dividing the core line constituting the signal line for transmitting the TMDS and the signal line for transmitting the power and control signals into several groups or at the same time covered with a single coating It is an object of the present invention to provide a flat high-definition multimedia interface cable capable of preventing a signal line or a core wire from being structurally deformed by external pressure by compressing the shielding film through heat treatment.

In order to achieve the above object, a flat high definition multimedia interface cable according to the present invention is a high definition multimedia interface (HDMI) cable for transmitting a video signal and an audio signal (TMDS) at the same time, a plurality of signal lines for transmitting TMDS and The ground line is composed of a plurality of first groups consisting of two signal lines and one ground line arranged in parallel with each other, and a plurality of signal lines for transmitting power and control signals are arranged in parallel with each other. Wherein the plurality of first groups and the second group are arranged in a line in parallel with each other, wherein the plurality of first groups and the second group are each surrounded by a shielding film containing aluminum and isolated from adjacent groups. Characterized in that configured to.

In addition, the flat high-definition multimedia interface cable according to the present invention to achieve the above object, in the high-definition multimedia interface cable for transmitting the video signal and audio signal (TMDS) at the same time, a plurality of signal lines and ground lines for transmitting TMDS Is arranged so that two signal lines arranged in parallel with each other are connected to each other through one covering to form one signal line group, and one ground line is positioned between each signal line group, and for transmitting power and control signals. A plurality of signal lines are arranged side by side and connected to each other through a coating, the signal line and ground line for transmitting the TMDS and the signal line for transmitting the power and control signals are arranged in parallel with each other to form aluminum Surrounded by a shielding film containing And a lock.

Flat high-definition multimedia interface cable according to the present invention, the signal line and the ground line inside the cable is arranged in parallel with each other formed in a flat form to reduce the signal interference between the signal line, to ensure the signal transmission strength, both ends of the cable The connection between the electrode of the socket and the PCB electrode can be performed by an automated process, thereby minimizing the simultaneous defect rate to improve the work productivity.

In addition, the flat high-definition multimedia interface cable according to the present invention, since the shielding film made of a laminated structure of aluminum and polyester to the signal line and the ground line inside the cable through the heat treatment, the position of the signal line and the ground line is fixed, the external pressure to the cable Even if this is applied, the structure of the signal lines and the ground lines arranged side by side in the cable, for example, the arrangement order, can be prevented from being deformed.

EMBODIMENT OF THE INVENTION Hereinafter, although the Example of this invention is described in detail, this invention is not limited to a following example, unless the summary is exceeded.

The HDMI cable which is commonly used can be classified into three types, A type, B type and C type according to the configuration of the signal line in the cable.

First, Type A and Type C have two signal lines and one ground line for transmitting video and audio signals (TMDS), and 12 signal lines and ground lines for forming a group, and 7 for transmitting power and control signals. It consists of two signal lines.

Type B is composed of 21 signal lines and ground lines forming one group with two signal lines and one ground line for transmitting TMDS, and eight signal lines for transmitting power and control signals.

The present invention is applied to all of the three types of HDMI cable described above, hereinafter, will be described with reference to the A type or C type.

3 is a view showing the configuration of a flat HDMI cable according to the present invention, Figure 4 is a cross-sectional view showing the internal configuration of a flat HDMI cable according to a first embodiment of the present invention, Figure 5 is a flat HDMI cable according to the present invention FIG. 3 is a diagram showing the configuration of a shielding film and an auxiliary shielding film surrounding an inner signal line.

Referring to FIG. 3, the flat HDMI cable 100 according to the present invention includes twelve 12 forming a plurality of first groups including two signal lines 150R and 150W and one ground line 142 for transmitting TMDS. Signal lines 150R, 150W and ground lines 142, and seven signal lines 150G, 150B, 150BL forming a second group for transmitting power and control signals are surrounded by the cable jacket 110. At this time, the signal lines 150R and 150W for transmitting the TMDS are composed of four signal lines 150R surrounded by the red sheath 130 at the outer diameter of the core wire 140 and four signal lines 150W surrounded by the white sheath 130. The ground wire 142 is composed of an uncoated bare core wire, and the signal wires 150B, 150G, and 150BL transmitting power and control signals are three signal lines surrounded by a black sheath 130 at an outer diameter of the core wire 140. 150B), and two signal lines 150G surrounded by the green coating 130 and two signal lines 150BL surrounded by the blue coating 130.

Referring to FIG. 4, in the cable jacket 110, twelve signal lines 150R and 150W and ground lines 142 for transmitting TMDS are provided with two red and white signal lines 150R and 150W and one ground line 142. Four signal line groups I are arranged side by side, and seven signal lines 150B, 150G, 150BL for transmitting power and control signals are arranged side by side in a group V. It is. All signal lines 150R, 150W, 150B, 150G, 150BL and ground lines 142 are surrounded by a shielding film 120 made of aluminum film to secure signal interference and signal transmission strength between the signal lines, and signal lines for transmitting TMDS. 150R and 150W and the ground wire 142 are surrounded by the shielding film 120 by one group, respectively, so that each group is isolated from the adjacent group.

The flat HDMI cable according to the present invention can transmit high capacity data at high speed while securing signal interference and signal transmission strength between signal lines by the following configuration.

The core wire 140 constituting the ground wire 142 and the signal line 150 in the flat HDMI cable 100 has a diameter of 0.2 to 0.5 mm, and when copper is used as the core material, the signal wire ( The outer diameter D of 150 is 2.5 to 3.5 times the diameter of the core wire 140.

The array spacing P between two signal lines 150W and 150R transmitting TMDS is such that the spacing between two cores 140 located at the center of the two signal lines 150W and 150R is within 1.5 times the diameter of the signal line. do. The bare core wire, that is, the ground wire 142 is arranged as close as possible to the white signal line 150W.

On the other hand, the signal lines 150B, 150G, and 150BL that transmit power and control signals may be arranged in close contact or spaced apart arbitrarily.

Using the flat HDMI cable (Example) and the conventional HDMI cable (Comparative Example) having the configuration described above, the most important characteristics of the signal loss (Attemeuation) and noise (cross-talk) was compared. Here, we tested the signal lines for transmitting TMDSs with different arrangements.

Table 1 shows the results of measuring the signal loss numerically. In this case, when the four groups of signal lines for transmitting TMDS were measured, the signal loss value of the example was 0.31 dB to 4.06 dB less than that of the comparative example. Further, although not shown in [Table 1], the signal loss value according to frequency was found to increase in the comparative example as the frequency increases.

Table 2 shows the numerical results of the measurement of signal noise. In this case, when the four groups of four signal lines for transmitting the TMDS were measured, the amount of noise generated in the example was -4.76 dB to -7.05 dB less than the amount of noise generated in the comparative example. At this time, since the noise is a log function, the difference in the actual amount of noise has a considerable difference than that represented by the numerical value.

As described above, since the embodiment and the comparative example are configured only in the arrangement of signal lines under the same conditions, the results shown in [Table 1] and [Table 2] may be assumed to be caused by the arrangement of the signal lines. Therefore, it can be seen that the twisted signal lines, that is, the signal lines for transmitting the TMDS, are arranged side by side to secure the signal interference and the signal transmission strength between the signal lines, thereby delivering high capacity data at high speed.

The signal lines 150W, 150R, 150G, 150B, 150BL and the ground line 142 having such a configuration are surrounded by the shielding film 120 to secure signal interference or signal transmission intensity generated during high frequency passage. In this case, four signal line groups transmitting TMDS surround one signal line group with shielding film 120 to isolate adjacent signal line groups, and signal lines transmitting voice signals do not need to isolate and shield each signal line. The entirety is surrounded by the shielding film 120.

In the first embodiment of the present invention, as the shielding film 120, a shielding film 120 including aluminum such as a single layer aluminum film, a multilayer structure of polyester and aluminum, and the like may be used. A structure laminated over two or more layers may be used.

Referring to FIG. 5, the shielding film 120 is formed in a multilayer structure of the first polyester 121 / the first aluminum 122 / the second polyester 123 / the second aluminum 124. The shielding film 120 has signal interference and signal transmission strength between the signal lines 150W, 150R, 150G, 150B, and 150BL in arranging all the signal lines 150W, 150R, 150G, 150B, 150BL and the ground lines 142 side by side. To ensure that When using the shielding film 120 including the polyester as shown in Figure 5 when the signal line (150W, 150R, 150G, 150B, 150BL) and the ground wire 142 is surrounded by the shielding film 120 and heat-treated to laminate, the shielding film The first polyester 121 of 120 is fused to the signal lines 150W, 150R, 150G, 150B, 150BL and the ground line 142 and compressed. When the shielding film 120 is fused to the signal lines 150W, 150R, 150G, 150B, 150BL and the ground wire 142, the signal lines 150W, 150R, 150G, 150B, 150BL or the ground wire in the cable 100 may be caused by external pressure. It is possible to prevent the structure of 142, for example, arrangement, etc. from being deformed.

On the other hand, when the shielding film 120 is used as an aluminum single layer, it may be separated by simply surrounding the signal line and the ground line divided into a predetermined structure without lamination.

6 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a second embodiment of the present invention.

Referring to FIG. 6, the flat HMDI cable according to the second embodiment of the present invention further includes an auxiliary shielding film 126 having the structure of FIG. 5 outside the shielding film 120 in the flat HMDI cable shown in FIG. 4. Only different ones have the same configuration. In this case, the auxiliary shielding film 126 has the same structure as the shielding film 120 and is integrated by simultaneously surrounding the signal line groups separated from each other by the shielding film 120.

The auxiliary shielding film 126 is formed by pressing the shielding film 120 by lamination by heat treatment, and the first polyester (not shown) in contact with the shielding film 120 forms the second aluminum 124 constituting the shielding film 120. It is fused to be configured.

7 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a third embodiment of the present invention.

Referring to FIG. 7, the flat HDMI cable according to the third embodiment of the present invention has the same structure as that of the first and second embodiments in which signal and ground lines are arranged inside the cable jacket 210. However, the signal line 250I for transmitting the TMDS is surrounded by the signal line 150R surrounded by the red sheath 130 and the white sheath 130 at the outer diameter of the core wire 140 as in the first and second embodiments. Unlike the signal line 150W, the two core wires 240 are surrounded by one sheath 230 and integrated, and the signal line 250V for transmitting power and control signals includes seven core wires 240 as one. It is different that it is enclosed by the coating | cover 232 and integrated. In addition, the signal lines 250I and 250V having the above-described configuration and the ground line 242 are surrounded by the shielding film 220 to be integrated. In this case, the shielding film 220 used has a configuration as shown in FIG. 5.

8 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a fourth embodiment of the present invention.

Referring to FIG. 8, a signal line 350I and a ground line 342 for transmitting TMDS inside the cable jacket 310 and a signal line 350V for transmitting power and control signals are shown in FIG. 7 in the third embodiment. The core wires 340 constituting the signal lines 350I and 350V, which are arranged in the same manner as the above-described configuration, are all surrounded by one covering 330 and connected to each other. At this time, the signal line 350I for transmitting the TMDS is formed of two core wires 340 adjacent to each other to form a first group, and the signal line 350V for transmitting power and control signals includes seven core wires 340. Arranged adjacent to each other to form a second group, the first group and the second group are connected to each other through a bridge (332) made of the same material as the sheath 330. The ground line 342 is configured to be positioned on one surface of the bridge 332.

9 is a view showing a state in which the flat HDMI cable according to the invention connected to the PCB.

9 shows a state in which the flat HDMI cable 100 according to the present invention is connected to the PCB 400, since the signal line and the ground line are arranged in parallel with the electrodes formed on the sockets connected to both ends of the cable or the contacts of the PCB. There is no need to select signal lines for each function, and soldering can be performed in an automated process. The soldering process may be replaced by placing the ends of the cores 140 from which the sheath 130 is removed at the contacts of the PCB and thermally bonding them. In this case, a jig for placing each core wire at a predetermined position of the PCB may be used. By using 19 cores can be welded at the same time, production error can be greatly reduced.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a perspective view showing the configuration of an HDMI cable according to the prior art.

FIG. 2 is a view showing an arrangement of signal lines constituting the HDMI cable shown in FIG.

3 is a view showing the configuration of a flat HDMI cable according to the present invention.

4 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a first embodiment of the present invention.

5 is a view showing the configuration of the shielding film and the auxiliary shielding film surrounding the signal line inside the flat HDMI cable according to the present invention.

6 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a second embodiment of the present invention.

7 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a third embodiment of the present invention.

8 is a cross-sectional view showing an internal configuration of a flat HDMI cable according to a fourth embodiment of the present invention.

9 is a view showing a state in which the flat HDMI cable according to the invention connected to the PCB.

<Description of the symbols for the main parts of the drawings>

100: HDMI cable 110, 210, 310: cable jacket

120, 220, 320: shielding film 121: first polyester

122: first aluminum 123: second polyester

124: second aluminum 126: auxiliary shielding film

130, 230, 232, 330: sheath 140, 240, 340: core wire

142, 242, 342: ground wire 150, 250, 350: signal line

332: Bridge 400: PCB

Claims (12)

In a high definition multimedia interface (HDMI) cable for transmitting video and audio signals (TMDS) at the same time, The plurality of signal lines and ground lines for transmitting TMDS are composed of a plurality of first groups consisting of two signal lines and one ground line arranged in parallel with each other, and the plurality of signal lines for transmitting power and control signals are parallel to each other. The first group and the second group are arranged in parallel with each other, and the plurality of first groups and the second group are each made of aluminum. Flat high definition multimedia interface cable, characterized in that it is configured to be isolated from the adjacent group surrounded by a shield. The method of claim 1, The shielding film is a flat high-definition multimedia interface cable, characterized in that formed of a multilayer structure of polyester and aluminum. The method of claim 1, And the plurality of first groups and the second group configured to be surrounded by the shielding film and to be isolated from an adjacent group. The method of claim 3, wherein The secondary shielding film is a flat high-definition multimedia interface cable, characterized in that formed of a multilayer structure of polyester and aluminum. The method of claim 4, wherein The auxiliary shielding film is a flat high-definition multimedia interface cable, characterized in that the compression is configured on the shielding film by lamination by heat treatment. In the high-definition multimedia interface cable for transmitting the video signal and the audio signal (TMDS) at the same time, Multiple signal lines and ground lines for transmitting TMDS are formed so that two signal lines arranged in parallel with each other are connected to each other through one covering to form one signal line group, and one ground line is positioned between each signal line group. And a plurality of signal lines for transmitting power and control signals are arranged to be parallel to each other and connected to each other through a single cover, wherein the signal lines and ground lines for transmitting the TMDS and the signal lines for transmitting the power and control signals The flat high-definition multimedia interface cable, characterized in that arranged in parallel with each other is surrounded by a shielding film containing aluminum and integrated. The method of claim 6, The signal line for transmitting the TMDS and the signal line for transmitting the power and control signals are configured to be connected to each other through one covering, and the signal line for transmitting the TMDS is formed by arranging two signal lines adjacent to each other. And a second group in which a plurality of signal lines for transmitting the power and control signals are arranged adjacent to each other, wherein the first group and the second group are made of the same material as the coating. Is configured to be connected to each other through, the ground wire is flat high-definition multimedia interface cable, characterized in that configured to be located on one side of the bridge. The method according to claim 1 or 6, The signal line is a flat high-definition multimedia interface cable, characterized in that the outer wire is surrounded by the outer sheath, the ground wire is composed of a bare core core. The method of claim 8, Flat core high-definition multimedia interface cable, characterized in that the core and the core core diameter is 0.2 to 0.5mm. The method of claim 8, The outer diameter of the coated signal line is a flat high-definition multimedia interface cable, characterized in that 2.5 to 3.5 times the core diameter. The method according to claim 1 or 6, The two signal lines arranged in parallel with each other among the plurality of signal lines and ground lines for transmitting the TMDS are configured such that a distance between two core wires respectively positioned at the center of the two signal lines is within 1.5 times the diameter of the signal line. Flat high definition multimedia interface cable. The method according to claim 1 or 6, The shielding film is a flat high-definition multimedia interface cable, characterized in that the crimped and configured to the signal line and the ground line by the lamination by heat treatment.

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