Patent ID: 7752745

Claim:
A production method of a wired circuit board holding sheet which is in the form of a sheet holding therein a plurality of separable wired circuit boards, the method comprising: preparing the wired circuit board holding sheet wherein the wired circuit boards are held in the sheet via at least one joint which is operative to be cut, and forming in a first surface of the joint a cutting notch having a first depth to facilitate cutting of the joint and a marking notch having a second depth that is less than the first depth to indicate that the cutting notch has a predetermined depth, wherein the cutting notch and the marking notch are formed simultaneously by using a punch comprising a combination of a main punch portion and a sub-punch portion, the main punch portion having a tip that extends beyond a tip of the sub-punch portion, and wherein the main punch portion is used to form the cutting notch and the sub-punch portion is used to form the marking notch.