Leaf springs are functional components made from thin metal sheets, formed by processes such as pressing, laser processing, or wire electrical discharge machining, and given elasticity through heat treatment. They are elastic bodies that primarily utilize bending stress to absorb and hold loads, and have the characteristic of returning to their original shape after the load is removed. Compared to coil springs, they are superior in space efficiency and are used in a wide range of applications such as providing elastic force in specific directions, contacts, retention, and locking mechanisms. Typical applications include suspensions and clutches in automotive parts, contacts in switches and connectors for electrical and electronic components, and door hinges and locking mechanisms in home appliances. Materials such as stainless steel, phosphor bronze, and beryllium copper are selected according to the required strength, corrosion resistance, and electrical conductivity. Precise mold design and processing accuracy are important factors that determine quality.