Patent ID: 6920681

Claim:
A method of preparing an electromagnetic actuator comprising a stationary member having a first core section carrying a first coil wound around the periphery of the first core section, a movable member magnetically coupled with said stationary member with a gap therebetween and having a second core section carrying a second coil wound around the periphery of the second core section, and a support member for displaceably supporting said movable member relative to said stationary member, said method comprising steps of: forming said stationary member, said movable member and said support member on a single silicon substrate by means of photolithography and plating; and removing the silicon substrate from under the movable member so as to make the movable member to be supported by the silicon substrate by way of the support member, wherein said step of removing the silicon substrate is a step of anisotropically etching the silicon substrate from the rear surface thereof.