US Patent 7794162 Mechanical shutter and camera module having the same

A mechanical shutter includes a base, four shutter blades, four permanent magnets, and four electromagnets. The base has an aperture for permitting light into a camera module. The shutter blade includes a light shielding portion capable of moving across the aperture by rotating about a shaft formed on the base, a securing portion secured on the base, and an elastic portion connecting the light shielding portion and the securing portion. The permanent magnet is secured on a light shielding portion and sleeves around a shaft. The electromagnets are capable of providing magnetic force to rotate the permanent magnets.