| 摘要 |
PURPOSE:To lessen wiring and to bring switching to effect with excellent characteristics by coupling the output of a video switch as a unit via a line with equal characteristic impedance and also to supplying it from several adequate coupling points to the same coupling points via difference lines. CONSTITUTION:Output parts of video switches 11-14 as small input units are coupled with output parts of adjacent video switches via lines 15-18. From adequate coupling points p1 and p2 among coupling points p1-p4, outputs are coupled via lines 19 and 20. Those lines 18-20 employ a wiring pattern on a printed substrate or shielding wires. Here, lines 15-18 are nearly equalized in length, and the lengths of lines 18 and 19 are nearly equalized to the total length of lines 15-18. Thus, supply terminals, output terminals of switches, can be connected with the shortest line length and supply terminals can be connected to supplied terminals via two lines, so that this will have a great advantage of forming a substantially large input video switch. |
