Patent ID: 7576455

Claim:
A high performance focusing actuator of a voice coil motor comprising; a retaining unit including a plastic retaining frame; a center portion of the plastic retaining frame being a receiving space; two opposite corners of the receiving space being chamfered; an inner side of each chamfered side being formed with a slide portion; a metal rear cover plate having a shape corresponding to that of the plastic retaining frame; the metal rear cover plate having an open space which is coaxial with the receiving space of the plastic retaining frame; an outer side of the metal rear cover plate having four outer plates; each of two opposite corners of each outer plate being formed with an inclined guide surface corresponding to the slide portion of the plastic retaining frame; one end of the inclined guide surface being formed with a buckling groove for receiving a buckling portion of the plastic retaining frame; an inner side of each corner of the metal rear cover plate being formed with an inner plate for guiding the slide portion of the plastic retaining frame; an iron receiving gap being formed between the inclined guide surface and outer plate; each iron receiving gap receives a magnet.