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Flexible circuit board

A technology of flexible circuit boards and conductive materials, applied in circuit devices, printed circuits, printed circuits, etc., can solve problems such as common mode noise

Inactive Publication Date: 2011-11-09
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the flexible printed circuit board, only a partial grounding conductive material is left at the position corresponding to the differential pair in the ground layer, and a certain distance on both sides of the grounding conductive material is a hollowed out area, and by setting the The width of the grounding conductive material is used to achieve impedance matching, thereby solving the problem of common mode noise derived from the traditional grid-like ground plane, enabling the flexible circuit board to transmit high-speed signals, and the flexible circuit board does not require additional costs , just adjust the existing wiring to achieve

Method used

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Embodiment Construction

[0011] Please refer to figure 2 A preferred embodiment of the flexible circuit board of the present invention includes a signal layer 10 and a ground layer 30 , and a layer of insulating medium 20 is filled between the signal layer 10 and the ground layer 30 . A differential pair 11 includes two differential transmission lines 12 and 14 routed in the signal layer 10 . A grounding conductive material 32 having the same length as the differential transmission lines 12 and 14 and having a width d is provided along the transmission direction of the differential transmission lines 12 and 14 in the ground layer 30, and the grounding conductive material 32 The area surrounded by the differential transmission lines 12 and 14 may be in the orthographic projection area on the ground layer 30 , and the hollowed out area is hollowed out within a certain distance on both sides of the grounded conductive material 32 . Wherein, the grounding conductive material 32 is optimally located dire...

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Abstract

The invention relates to a flexible circuit board, which comprises a signal layer and a grounded layer. A layer of insulating medium is filled between the signal layer and the grounded layer; the signal layer is distributed with a differential pair; the differential pair comprises two differential transmission lines; the grounded layer is provided with a grounded conducting material along the transmission direction of the differential transmission lines; the grounded conducting material is positioned in the area enclosed by the two differential transmission lines, which is positioned in an orthogonal projection area of the grounded layer; and certain distance on two sides of the grounded conducting material is an excavating area. The flexible circuit board can be realized by only adjusting the prior wire distribution mode without adding extra cost.

Description

technical field [0001] The invention relates to a flexible circuit board, in particular to a flexible circuit board capable of transmitting high-speed differential signals. Background technique [0002] Flexible circuit boards are printed circuit boards made of flexible insulating substrates, which have many advantages that rigid printed circuit boards do not have. For example, the thickness of the flexible circuit board is relatively thin, and it can be bent, wound, and folded freely, and can be arranged arbitrarily according to the requirements of the space layout, and can be moved and stretched arbitrarily in the three-dimensional space, so as to achieve the integration of component assembly and wire connection. The use of flexible circuit boards can greatly reduce the size of electronic products, and is suitable for the development of electronic products in the direction of high density, miniaturization, and high reliability. Therefore, flexible circuit boards have been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K1/02
CPCH05K1/0393H05K2201/09318H05K1/0253H05K2201/0969H05K1/0245H05K1/0224H05K2201/09236Y10T29/49155
Inventor 白育彰许寿国白家南
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD