Voice coil motor
Disclosed is a voice coil motor, including a base having an opening, a stator is disposed on the base and including a magnet, a mover including a conductive coil opposing with the magnet, and a cylindrical bobbin in which a conductive coil is installed, a case fixed on the base and covering the stator, and a spacer intervened between the stator and the case and constituted with at least two spacers, each formed with different materials to absorb pressures and shocks transmitted to the stator from external.
1. A voice coil motor comprising:
a base having an opening;
a stator disposed over an upper surface of the base and including a magnet;
a mover including a conductive coil opposite to the magnet and a bobbin coupled to the conductive coil;
a case fixed on the base and covering the stator; and
a spacer interposed between the stator and the case to absorb pressures and shocks applied to the stator from the exterior, the spacer formed with at least two spacers, each formed with different materials,
wherein the spacers include a first spacer and a second spacer adjoining mutually, and wherein each of the first and second spacers has shape having an opening exposing the bobbin.
2. The voice coil motor set forth in claim 1 , wherein at least one of the first spacer and the second spacer is formed with a porous material.
3. The voice coil motor set forth in claim 2 , wherein the first spacer and the second spacer are subsequently disposed between the case and the stator, the second spacer is formed with a porous material.
4. The voice coil motor set forth in claim 3 , wherein the second spacer comprises an expanded resin formed with a plurality of pores.
5. The voice coil motor set forth in claim 4 , wherein each of the pores includes air.
6. The voice coil motor set forth in claim 2 , wherein the first spacer and the second spacer are formed with the same shape when shown from a plane.
7. The voice coil motor set forth in claim 2 , further comprising an adhesive between the first spacer and the second spacer.
8. The voice coil motor set forth in claim 2 , wherein one of the first spacer and the second spacer is formed with the porous material using a synthetic rubber as a main material, the other being formed with PolyethyleneTerephthalate (PET).
9. The voice coil motor set forth in claim 1 , wherein the stator comprises a yoke setting the magnet, one of the first spacer and the second spacer contacting the yoke, the other contacting the case.
10. The voice coil motor set forth in claim 9 , wherein an elastic member is interposed between the first spacer and the yoke, one end of the elastic member being intervened between the first spacer and the yoke, and the other end being coupled on the bobbin.