| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a circuit board by which a taper angle is easily controlled and desired taper angle (e.g. in the range of 30-50 deg.) can stably be obtained. SOLUTION: This method includes a first process in which Al or a material layer primarily composed of Al is patterned and a prescribed pattern wiring is formed, and a second process in which a photoresist 100, having a prescribed size of aperture on the wiring is formed and a prescribed area of the wiring is etched with an etching solution including at least nitric acid. The concentration of the nitric acid in the etching solution in terms of the mass ratio is to be in the range of 11.3-12.78 mass%, the liquid temperature is to be in the range of 37.5-42.5 deg.C, and the etching rate is to be in the range of 200-400 nm/ min.
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