Patent ID: 8420944

Claim:
A connection structure of flexible printed circuits comprising: a first flexible printed circuit and a second flexible printed circuit, each respectively including: a resin base, a plurality of wiring patterns arranged side by side on the resin base, so as to include inner wiring patterns and outermost wiring patterns, a resin cover film disposed to cover portions of the wiring patterns opposite to the resin base, and a plurality of connection portions, where the plurality of wiring patterns are not covered by the resin cover film; wherein connection portions of the first flexible printed circuit are connected to connection portions of the second flexible printed circuit; wherein in the connection portions, each of the outermost wiring patterns includes a large width portion wider than both inner wiring patterns in the connection portions and wiring patterns covered by the resin cover film; wherein large width portions on the first flexible printed circuit are connected to large width portions on the second flexible printed circuit by means of soldering; wherein said first and second flexible printed circuits each include an equipment connection portion, disposed in the same lengthwise direction of said wiring patterns relative to said connection portions; wherein said large width portions on the first and second flexible printed circuits are located in connection portions closest to said equipment connection portions; wherein large width portions on one of said first and second flexible printed circuits are narrower than large width portions on the other of said first and second flexible printed circuits, but wider than both inner wiring patterns in the connection portions and wiring patterns covered by the resin cover film; wherein inner wiring patterns and portions of the outermost wiring patterns other than large width portions in the connection portions have the same widths as wiring patterns covered by the resin cover films; and wherein each large width portion only protrudes outwardly from a wire in a wiring pattern, but only in the widthwise direction of the flexible printed circuits.