Patent ID: 9055676
Filing Date: 2015-06-09
Classification: H05K,Y10T

Abstract:
1. A differential signal transmission circuit, comprising: an insulating layer; two first conductive seed layers in parallel formed on one surface of the insulating layer; two signal lines provided in parallel on the first conductive seed layers and having the same pattern as the first conductive seed layers; a second conductive seed layer formed on each of outer sides of the first conductive seed layers on the one surface of the insulating layer; a GND line formed on each of outer sides of the two signal lines on the second conductive seed layer and having the same pattern as the second conductive seed layer; and a wiring line layer formed on the other surface of the insulating layer, the differential signal transmission circuit being configured by a double-sided flexible printed circuit board, the signal lines, the first conductive seed layers, the GND line, the second conductive seed layer, and the wiring line layer being formed by a semi-additive method on the insulating layer, and the signal line and the GND line being formed such that a distance S between the two signal lines is greater than a distance D between the GND line and one of the two signal lines located closer to the GND line.