Reflow bonding method and method of manufacturing head suspension
A reflow bonding method easily bonds first and second wiring members together by reflowing solder arranged on at least one of first and second bonding parts that are defined on the first and second wiring members, respectively. The method includes positioning the first and second wiring members so that the first and second bonding parts face each other with the solder interposed between them and heating and pressing one of the first and second bonding parts from behind with a pressing face of a heater chip so that the first and second bonding parts lie one on another and so that the solder is heated and reflows to bond the first and second wiring members together.
1. A method of manufacturing a head suspension, the head suspension including a base, a load beam connected to the base, a first wiring member having a first metal base, a first insulating layer, and a first conductor layer that are sequentially layered one on another, and a second wiring member having a second metal base, a second insulating layer, and a second conductor layer that are sequentially layered one on another, the first wiring member having a first bonding part, the second wiring member having a second bonding part, the first and second bonding parts being bonded together by reflowing solder arranged on at least one of the first and second bonding parts, the manufacturing method comprising steps of:
positioning the first and second wiring members so that the first and second bonding parts face each other with the solder interposed between them; and
heating and pressing the metal base behind one of the first and second bonding parts with a pressing face of a heater chip being coated with a nickel film so that the first and second bonding parts lie one on another and the solder is heated and reflows to bond the first and second wiring members together and;
wherein the first and second metal bases are made of stainless steel, and
the hardness of the nickel film is substantially equal to that of the stainless steel.
2. The method of claim 1 wherein the nickel film is a film of electroless nickel.
3. The method of claim 1 wherein the nickel film is a composite plated film of electroless nickel with dispersed fluororesin particles.
4. The method of claim 1 , wherein
a hardness of the pressing face is set by the nickel film so that the hardness of the pressing face is substantially equal to a hardness of an area behind the one of the first and second bonding parts to be pressed by the pressing face.
5. The method of claim 4 , wherein the nickel film is a film of electroless nickel.
6. The method of claim 4 , wherein the nickel film is a composite plated film of electroless nickel with dispersed fluororesin particles.