OPTICAL IMAGE STABILIZER WITH IMPROVED MAGNETIC SENSITIVITY

摘要

The present invention provides a lens driving device that is based on a Voice Coil Actuator (VCA) structure and provides the auto-focusing and optical image stabilization (OIS) functions. According to the present invention, these two functions can be realized by a common magnet scheme, or a separate magnet scheme. Besides, the present invention also provides an improved structure for the lens driving device to enhance the function of OIS thereof. By arranging a magnetic enhancement device below the OIS coils in the lens driving device, the magnetic driving force of the OIS coils and magnetic induction of the Hall sensors, if present, can be enhanced, and the magnetic sensitivity thereof may be also improved.

主权项

1. A lens driving device, comprising:
a lens assembly having an optical axis; an auto-focusing (AF) coil disposed around an outer surrounding of said lens assembly with respect to said optical axis; a set of optical image stabilization (OIS) coils disposed on a plane having a normal direction perpendicular to said optical axis; a magnet group comprising:
a set of first magnets arranged above said set of OIS coils correspondingly in such a way that each of said first magnets has a surface facing to said AF coil; anda set of second magnets arranged above said set of OIS coils correspondingly in such a way that each of said second magnets has a surface facing to said OIS coils; and a magnetic enhancement device disposed under said set of OIS coils.