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Flexible printed-circuit board

A flexible printing and substrate technology, applied in the directions of printed circuits, printed circuits, printed circuit components, etc., can solve the problems of flexible substrates that have not yet been proposed, increased cost, signal reflection or interference, etc.

Inactive Publication Date: 2007-06-06
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, flexible substrates that can mount multiple connectors, are inexpensive, and can prevent signal reflection and interference have not yet been proposed.
The above-mentioned Patent Document 1 does not suggest any technique for suppressing reflection of signals and disturbing noise generated when a plurality of connectors are mounted on a flexible substrate.
If you simply install multiple connectors on one side, as shown in Figure 8, the installation area increases with the number of connectors, and the cost increases
In addition, as shown in Figure 9, if the mounting area is simply reduced regardless of the terminal arrangement, if multiple connectors are mounted on both sides of the substrate, problems such as signal reflection or interference will occur, and high-speed signal transmission will become difficult.

Method used

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  • Flexible printed-circuit board
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0058] (constitute)

[0059] FIG. 1 shows a configuration diagram of a flexible printed circuit board in the first embodiment of the present invention. FIG. 1( a ) is a plan view of the flexible printed circuit board in this embodiment. The flexible printed substrate has a main body 100 , wiring 101 and surface pads 103 . In this flexible substrate, the substrates are overlapped in two layers in the overlapping portion 105, and the rear surface pad 104 is provided on the side opposite to the drawing surface of the overlapping portion 105 (see FIG. 1(c), (d)).

[0060] FIG. 1( b ) is a plan view of the flexible printed circuit board when the overlapping portion 105 is unfolded. The overlapping portion 105 is developed into a front side 105a and a back side 105b. As described above, the back pad 104 is formed on the back side of the overlapping portion 105 . Fig. 1(c) is a side view of the flexible printed circuit board viewed from the direction A in the figure (a). Fig. 1(...

no. 2 Embodiment approach

[0074] Fig. 2 is a diagram showing a configuration of a flexible printed circuit board in a second embodiment of the present invention. Fig. 2(a) is a plan view of the flexible printed circuit board in this embodiment. The flexible printed substrate has a main body 100 , wiring 101 and surface pads 103 . In this flexible substrate, the substrates are overlapped in two layers in the overlapping portion 105, and the rear surface pad 104 is provided on the side opposite to the overlapping portion 105 in the drawing (see FIG. 2(b), (c)). FIG. 2( b ) is a plan view of the flexible printed circuit board when the overlapping portion 105 is unfolded. The overlapping portion 105 is developed into a front side 105a and a back side 105b. (c) of the same figure is a sectional view in the overlapping portion 105 of the same figure (a).

[0075] Next, each constituent element will be described in detail. In the figure, components assigned the same reference numerals as those of the firs...

no. 3 Embodiment approach

[0090] Fig. 3 is a configuration diagram of a flexible printed circuit board in a third embodiment of the present invention. Fig. 3(a) is a plan view of the flexible printed circuit board in this embodiment. The flexible printed substrate has a main body 100 , wiring 101 and surface pads 103 . This flexible substrate is laminated in two layers at an overlapping portion 105 , and has rear pads 104 on the side opposite to the overlapping portion 105 in the drawing (see FIG. 3( b ), (c) ). FIG. 3( b ) is a plan view of the flexible printed circuit board when the overlapping portion 105 is unfolded. The overlapping portion 105 is developed into a front side 105a and a back side 105b. FIG. 3( c ) is a cross-sectional view in the overlapping portion 105 of the same figure ( a ).

[0091] Each constituent element will be described in detail below. In the figure, components assigned the same reference numerals as those of the first embodiment have the same configurations and funct...

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PUM

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Abstract

A flexible printed-circuit board at a low cost, which is adaptable to a high-speed signal transmission and which can mount a plurality of connectors. The flexible printed-circuit board comprises a first face (100a) and a second face (100b) confronting each other, a flexible printed-circuit board body (100) having an overlapped portion (105) formed by folding one end, a plurality of wires (101) arranged substantially in parallel with each other on the first face (100a) of the body, first pads (103) connected with the individual one-ends of the wires and formed wider than the wires on the first-face side surface (105a) of the overlapped portion, and second pads (104) disposed at the individual one ends of the wires and formed wider than the wires on the second-face side surface (105b) of the overlapped portion. The individual wires (101a), with which the first pads (103) are connected, and the individual wired (101b), with which the second pads (104) are connected, are alternately arranged on the first face.

Description

technical field [0001] The present invention relates to a flexible printed circuit board used for signal transmission in electronic equipment such as computer terminals and AV equipment. Background technique [0002] In recent years, serial interfaces such as USB (Universal Serial Bus) and IEEE (Institute of Electrical and Electric Engineers) 1394 have penetrated into computer terminals such as PCs (personal computers) and electronic equipment such as AV equipment, and the corresponding models have also increased. Therefore, the number of ports of the interface that one electronic device has increases. In addition, in electronic equipment, a flexible printed circuit board that is easy to attach and detach is generally used as a transmission medium for relaying signals. Against such a background, flexible printed boards that can transmit signals at high speed and have a plurality of connection ports are being sought. [0003] In order to transmit signals at high speed on a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K1/11H05K1/02
CPCH05K2201/09445H05K1/0237H05K2201/09727H05K1/118H05K2201/055H05K1/0219H05K2201/09236
Inventor 柴田修中山武司齐藤义行
Owner PANASONIC CORP