KR20220002693U - Flexible flat cable with metal foil shielding strengthened board - Google Patents

Abstract

The present invention provides a flexible flat cable equipped with a metal foil shield reinforcement plate that is used for impedance matching of a connector and can perform transmission with low loss of a high-frequency signal. This flexible flat cable with metal foil shield reinforcement plate has one electrical conductor layer, a plurality of electroplating layers, a first insulation layer, a second insulation layer, a plurality of high frequency compensation layers, and a Myra layer. The electrical conductor layer has a first length, and the first insulating layer and the second insulating layer are provided on both sides of the electrical conductor layer. The high frequency compensation layer is provided on the first free end and the second free end of the electrical conductor layer. The high frequency compensation layer provides a reinforcing plate having a fourth length and an aluminum foil layer having a fifth length. The fourth length is not longer than the first length and the fifth length is shorter than the fourth length. The myra layer covers a portion of the high frequency compensation layer.

Description

Flexible flat cable with metal foil shielding strengthened board}

The present invention relates to a flexible flat cable equipped with a metal foil shield reinforcement plate capable of obtaining a better high-frequency response at a high frequency belonging to the field of flexible flat cable technology.

Existing flexible flat cables may cause signal loss due to impedance matching in the process of connecting to a connector, and in particular, more serious loss may occur when transmitting a high frequency signal. See Figure 2. This is the frequency response of the existing flexible flat cable. In FIG. 2, the x axis is frequency and the unit is megahertz (MHz), and the y axis is signal loss and the unit is decibel (dB). In the frequency response diagram, the frequency starts at 0.3 MHz and ends at 15,000 MHz. It can be seen that at the sampling points M1, M2, M4, and M5, the oscillation caused by the signal, that is, the loss part, is more than -3dB. This means that at least half of the original signal is lost. And one curve observed in the figure is between the sampling points M1, M2, M4 and M5. This is the minimum signal loss limit required by the USB3.0 communication protocol. As can be clearly seen from FIG. 2, the existing flexible flat cable no longer conforms to the USB3.0 communication protocol standard.

In addition, in order to reinforce the free end of the cable, that is, the end of the cable, the existing flexible flat cable provides a relatively hard reinforcing member of a certain length at both ends of the flexible flat cable to increase the hardness of both ends of the flexible flat cable. In practical applications, long flexible flat cables are shortened by punching or cutting processes, depending on the required cable length. However, when the reinforcing member is cut during the flexible flat cable punching or cutting process, if the reinforcing member is made of an electrically conductive material, metal fragments or filaments may be generated during this process, resulting in a short circuit in the flexible flat cable.

The present invention proposes a flexible flat cable equipped with a metal foil shield reinforcement plate in order to solve the problems of short circuit and poor high frequency response caused by existing connectors.

The first object of the present invention is to provide a flexible flat cable equipped with a metal foil shield reinforcement plate and use it for impedance matching of a connector to achieve transmission with low loss of a high-frequency signal.

The second object of the present invention is based on the flexible flat cable equipped with the metal foil shielding reinforcing plate through integrating and combining the electric conductor layer, the electroplating layer, the first insulating layer, the second insulating layer, the high frequency compensation layer, and the Myra layer. It is to prevent a cost increase and a complicated process that occurs when attaching a subsequent reinforcing member.

The third object of the present invention is to form a compensation layer composed of a reinforcing plate and an aluminum foil layer having an asymmetrical length through a cutting method based on the flexible flat cable equipped with the metal foil shielding reinforcing plate to easily insert/detach the connector and make electrical contact. To achieve the effect of increasing certainty and preventing the occurrence of short circuits.

The fourth object of the present invention is based on the flexible flat cable with the metal foil shielding reinforcement plate, the myra layer is installed on the first insulation layer alone, installed on the second insulation layer, or installed on the first insulation layer and the second insulation layer. It is installed to control the characteristic impedance.

In order to achieve the above object and other objects, the present invention provides a flexible flat cable equipped with a metal foil shield reinforcement plate that can be used for impedance matching of a connector to perform transmission with low loss of a high frequency signal. This flexible flat cable with metal foil shield reinforcement plate has one electrical conductor layer, a plurality of electroplating layers, a first insulation layer, a second insulation layer, a plurality of high frequency compensation layers, and a Myra layer. The electrical conductor layer forms a first surface, a second surface, a first free end and a second free end. The first free end and the second free end are formed in the electrical conductor layer. The electrical conductor layer has a first length. A plurality of electroplating layers are provided on the second surface and are adjacent to the first free end and the second free end. One side of the first insulating layer is provided on the first surface. The first insulating layer has a second length. The second length is greater than or equal to the first length. A second insulating layer is provided on the second surface. The second insulating layer has a third length. The third length is shorter than the first length. The second insulating layer is exposed to the electrical conductor layer at a portion adjacent to the first free end and the second free end, and the electroplating layer is installed. The other side of the first insulating layer is provided on one side of the plurality of high frequency compensation layers. Each high-frequency compensation layer has a reinforcing plate and an aluminum foil layer. One side of the reinforcing plate is installed at the first free end and the second free end. The reinforcing plate has a fourth length. The fourth length is shorter than or equal to the first length. The other side of the reinforcing plate is installed on the aluminum foil layer. The aluminum foil layer has a fifth length. The fifth length is shorter than the fourth length. The myra layer is provided on at least one of one side of the first insulating layer and one side of the second insulating layer to partially cover the high frequency compensation layer.

Compared with the existing technology, the flexible flat cable with metal foil shield reinforcement plate proposed by the present invention can provide impedance matching at high frequency transmission, and has relatively low signal loss at high frequency, so it conforms to related communication protocols. For example, it meets the USB-related signal frequency response requirements. In addition, since the high-frequency compensation layer is simultaneously stacked during the manufacturing process of the flexible flat cable, the manufacturing process steps are reduced and the subsequent processing cost is reduced. In addition, the present invention solves the problem that a short circuit occurs between several lines of conductors in a flexible flat cable due to metal fragments or filaments generated during the punching or cutting process of the flexible flat cable.

1 is a side view of the structure of a flexible flat cable equipped with a metal foil shield reinforcement plate according to an embodiment of the present invention.
2 is a frequency response diagram of a conventional flexible flat cable.
3 is a frequency response diagram of a flexible flat cable equipped with a metal foil shield reinforcement plate of FIG. 1 of the present invention.

In order to help you fully understand the purpose, characteristics and efficacy of the present invention, the following specific examples are presented together with the drawings and described as follows.

In the present invention, 'one' or 'one' describes a unit, part, component member, etc. It is merely for explanatory convenience and to provide a general meaning to the scope of the present invention. Therefore, except where expressly indicated otherwise, these descriptions are to be understood as one or at least one, and that the singular number also includes the plural at the same time.

Terms used in the present invention '... In … The terms 'has', 'includes', 'includes' or other similar terms refer to an inclusive, but not exclusive, inclusion. For example, a part, structure, product or device containing multiple significant elements includes not only those listed in this document, but also other elements not expressly listed that are normally inherent in the part, structure, product or device. do. Unless expressly indicated otherwise, the term 'or' is an inclusive 'or' and not an exclusive 'or'.

See Figure 1. This is a side view of the structure of the flexible flat cable equipped with the metal foil shield reinforcement plate of the embodiment of the present invention. In FIG. 1, a flexible flat cable 10 having a metal foil shielding reinforcement plate is used for impedance matching of a connector (not shown in the drawing), so that transmission with low loss of high-frequency signals can be performed.

The flexible flat cable 10 with the metal foil shielding reinforcing plate includes an electrical conductor layer 12, an electroplating layer 14, a first insulating layer 16, a second insulating layer 18, a high frequency compensation layer 20, and Myra layer (22) is included.

The electrical conductor layer 12 defines a first surface, a second surface, a first free end, and a second free end. The first free end and the second free end are formed in the electrical conductor layer 12 . In FIG. 1, the first surface and the second surface refer to the upper and lower surfaces of the electrical conductor layer 12, respectively. The first free end and the second free end refer to the left and right ends of the electrical conductor layer 12, respectively. The electrical conductor layer 12 has a first length L1. In this embodiment, the electric conductor layer 12 will be described with one conducting wire as an example. In other embodiments, the number of wires may be one or more.

An electroplating layer 14 is provided on the second surface and is adjacent to the first free end and the second free end. In this embodiment, two electroplating layers 14 will be described as an example. These two are installed at the first free end and the second free end, respectively.

The lower side of the first insulating layer 16 is provided on the first surface, and the first insulating layer 16 has a second length L2. The second length L2 is greater than or equal to the first length L1. In this embodiment, the first insulator 16 can isolate interference of electrical signals or external electrical signals (eg, static electricity) between one or several conductors.

The upper side of the second insulating layer 18 is provided on the second surface, and the second insulating layer 18 has a third length L3. The third length L3 is shorter than the first length L1. The second insulating layer 18 is exposed to the electrical conductor layer 12 at a portion adjacent to the first free cup and the second free end, and an electroplating layer 14 is provided. In this embodiment, the second insulating layer 18 can isolate interference of electrical signals or external electrical signals (for example, static electricity) between one or more conductors 12 .

The upper side of the first insulator 16 is installed on the lower side of the high frequency compensation layer 20 . In this embodiment, two electroplating layers 14 will be described as an example. These two are installed at the first free end and the second free end, respectively. In addition, the high frequency compensation layer 20 includes a reinforcing plate 202 and an aluminum foil layer 204.

The lower side of the reinforcing plate 202 is installed at the first free end and the second free end. The material of the reinforcing plate 202 may be a non-metal such as polyethylene terephthalate (PET). The reinforcing plate 202 has a fourth length L4. The fourth length L4 is shorter than or equal to the first length L1. In other words, the reinforcing plate 202 may be installed at the first free end and the second free end respectively in an actual manufacturing method, or may be directly installed at the first free end and the second free end as an integral body. In this embodiment, the reinforcing plate 202 is aligned or nearly aligned with the end of the first free end and the end of the second free end.

The upper side of the reinforcing plate 202 is installed on the aluminum foil layer 204. The aluminum foil layer 204 is a metal foil formed of at least one of aluminum, copper, silver, tin, and gold. The aluminum foil layer 204 has a fifth length L5. The fifth length L5 is shorter than the fourth length L4. It should be noted that the aluminum foil layer 204 is recessed at a slight distance between the first free end and the second free end so that the reinforcing plate 202 provides a space above the ends of the first free end and the second free end so that when connecting the connector Short circuits can be prevented. That is, the aluminum foil layer 204 does not have to be aligned with the first free end and the second free end of the electrical conductor layer 12 . In this embodiment, the cross section of the space is described as an example of a triangle. In other embodiments the cross-section of space SP can take any shape. In this embodiment, the size of the triangular space is as follows. The height range is between 0.01mm and 0.1mm, with a relatively ideal height of 0.05mm. And the width ranges from 0.1mm to 0.5mm, with a relatively ideal width of 0.3mm.

The myra layer 22 is installed on the upper side of the first insulator 16 to cover a portion of the high frequency compensation layer 20 . Note that, if the fourth length (L4) of the reinforcing plate 202 is equal to the first length (L1), the myra layer 22 is the reinforcing plate 202 other than the upper side of the first insulator 16. Most of the is that it is between the myra layer 22 and the first insulating layer 16. In another embodiment, the myra layer 22 is installed on the lower side of the second insulator 18 alone or simultaneously installed on the upper side of the first insulator 16 and the lower side of the second insulator 18 Impedance can be controlled.

The flexible flat cable 10 with the metal foil shielding reinforcing plate also contains an adhesive layer (not shown in the drawing), which is installed on the first surface to bond the reinforcing plate 202 and the first insulating layer 16. used to

Reference is also made to FIG. 3 here. This is a frequency response diagram of a flexible flat cable equipped with a metal foil shield reinforcement plate of FIG. 1 of the present invention. In FIG. 3, the x-axis of the frequency response diagram is frequency and the unit is megahertz (MHz), and the y-axis of the frequency response diagram is signal loss and the unit is decibel (dB). In the frequency response diagram, the frequency starts at 0.3 MHz and ends at 15,000 MHz. Compared with FIG. 2 , it can be seen that the vibration caused by the signal at the sampling points M1 , M2 , M4 and M5 , that is, the loss part is controlled to within -3 dB. This shows that signal loss under high-frequency operation can be suppressed reliably. One curve observed in the figure (i.e. USB3.0 communication protocol) lies between the sampling points M1, M2, M4 and M5. This meets the minimum signal loss limit required by the USB3.0 communication protocol. Therefore, compared with existing flexible flat cables, the present invention has certain effects.

The present invention was presented in the above example. However, what those skilled in the art should understand is that these embodiments are for explaining the present invention, and do not limit the scope of the present invention. It should be noted that substitutions and changes in the form having the same effect as the embodiments of the present invention fall within the scope of the present invention. Therefore, the scope of protection of the present invention should be based on what is described in the claims.

10 Flexible flat cable with metal foil shield reinforcement plate
12 electrical conductor layer
14 electroplating layer
16 first insulating layer
18 2nd insulating layer
20 high frequency compensation layer
202 reinforcement plate
204 aluminum foil
22 Myra layer
L1 first length
L2 second length
L3 third length
L4 fourth length
L5 fifth length

Claims (5)

A flexible flat cable equipped with a metal foil shielding reinforcing plate that can be used for impedance matching of connectors to perform transmission with low loss of high-frequency signals. There is a compensation layer and a myra layer,
the electrical conductor layer defines a first surface, a second surface, a first free end and a second free end, the first free end and the second free end are formed in the electrical conductor layer, the electrical conductor layer has a first length; ,
a plurality of electroplating layers are provided on the second surface and are adjacent to the first free end and the second free end;
one side of the first insulating layer is provided on the first surface and the first insulating layer has a second length, the second length not shorter than the first length;
A second insulating layer is provided on the second surface, the second insulating layer has a third length, the third length is shorter than the first length, and the second insulating layer is adjacent to the first free end and the second free end. exposed to the electrical conductor layer in the electroplating layer is installed,
One side of the plurality of high frequency compensation layers is provided with the other side of the first insulating layer, and each high frequency compensation layer has a reinforcing plate and aluminum foil:
One side of the reinforcing plate is installed at the first free end and the second free end, and the reinforcing plate has a fourth length, the fourth length being no longer than the first length;
The other side of the reinforcing plate is installed on the aluminum foil layer, and the aluminum foil layer has a fifth length, the fifth length being shorter than the fourth length,
The Myra layer is a flexible flat cable equipped with a metal foil shielding reinforcing plate installed on at least one of one side of the first insulating layer and one side of the second insulating layer to partially surround the high frequency compensation layer.
The method of claim 1,
A space is formed between the end of the aluminum foil layer and the end of the reinforcing plate, the cross section of the space is triangular, the height range of the triangle is between 0.01 mm and 0.1 mm, and the width range of the triangle is between 0.1 mm and 0.5 mm. Flexible flat cable with phosphorus metal foil shield reinforcement plate.
The method of claim 2,
A flexible flat cable with a metal foil shield reinforcement plate having a height of 0.05 mm and a width of 0.3 mm.
The method of claim 1,
A flexible flat cable equipped with a metal foil shield reinforcement plate in which the end of the aluminum foil layer aligns with the free end of the electrical conductor layer.
The method of claim 1,
The aluminum foil layer is a metal foil formed of at least one of aluminum, copper, silver, tin and gold, and the material of the reinforcing plate is polyethylene terephthalate (PET).

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