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Flexible circuit board

A flexible circuit board, conductive material technology, applied in circuit devices, printed circuits, printed circuits, etc., can solve problems such as inability to transmit high-speed differential signals

Inactive Publication Date: 2009-02-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the differential pair 51 is transmitted on the signal layer, common mode noise will be generated because the copper foil grids on the ground layer corresponding to the differential transmission line 52 and the differential transmission line 54 are different, which is why ordinary flexible circuit boards cannot transmit high-speed Reason for Differential Signaling

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 and is routed on the signal layer 10 . The part of the ground layer 30 corresponding to the bottom of the differential transmission lines 12 and 14 is hollowed out to avoid the problem of low impedance of the transmission line caused by the distance between the upper differential pair 11 and the lower ground layer 30 being too close. figure 2 The rectangular hollowed out area 32 in the center of the ground layer 30 is the copper skin hollowed out area. On the signal layer 10, a grounding conductive material equal in length to the differential pair 11 is provided in parallel on both sides of the differential pair 11. In this preferred embodim...

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Abstract

A flexible circuit board comprises a signal layer, a grounding layer. A layer of insulating medium is filled between the signal layer and grounding layer; the signal layer is provided with a differential pairs comprising two differential transmission lines; a scooping area on the grounding layer is perpendicular and opposite to the differential transmission line; two grounding conductive material strips spaced from their adjacent transmission line are separately parallel at two sides of differential pair. The inventive flexible circuit board can transmits high speed signal, eliminates common mode noise problem derived from grid grounding layer of existing technology; The inventive flexible circuit board is accomplished without extra cost but regulating existing wire laying mode.

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 Applications(China)
IPC IPC(8): H05K1/02
CPCH05K1/0253H05K2201/0969Y10T29/49156H05K1/0224H05K2201/09336H05K1/0393H05K1/0245H05K2201/09236
Inventor 白育彰许寿国刘建宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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