Membrane keyboard and manufacturing method thereof

A manufacturing method of membrane keyboard, applied to assemble a plurality of restoring members in a restoring member assembly fixture to a membrane circuit board, the method comprises the following steps:

• forming at least one first positioning hole on an upper circuited layer, forming at least one second positioning hole and a plurality of hollow portions on a spacer layer, and forming at least one third positioning hole on a lower circuited layer, wherein a minimum diameter of the second positioning hole is smaller than a minimum diameter of the first positioning hole, and the minimum diameter of the second positioning hole is smaller than a minimum diameter of the third positioning hole;
• adhering the upper circuited layer, the spacer layer, and the lower circuited layer to form a semi-finished membrane circuit board, and the first positioning hole, the second positioning hole, and the third positioning hole collectively form a restoring member positioning hole;
• placing the membrane circuit board in the restoring member assembly fixture and passing the restoring member positioning hole through a locating pillar of the restoring member assembly fixture, with an inner wall of the second positioning hole abutting the locating pillar, so that the central positions of the restoring members respectively correspond to the central positions of the hollow portions;
• and
• assembling the restoring members onto the membrane circuit board.