Miniature lens driving apparatus
A miniature lens driving apparatus includes plurality of wires, an optical image stabilizing (OIS) mechanism having a lens holder, at least one magnet, and a plurality of coils; and an autofocus (AF) mechanism having an AF moving platform movable along an optical axis, at least one coil, and at least one magnet; wherein the said plurality of coils of the OIS mechanism operatively associates with the said at least one magnet of the OIS mechanism to move the said lens holder of the OIS mechanism along a direction substantially perpendicular to the optical axis; wherein the said at least one coil of the AF mechanism operatively associates with the said at least one magnet of the AF mechanism to move the said AF moving platform along the optical axis.
1. A miniature lens driving apparatus comprising:
(a) a plurality of wires;
(b) an optical image stabilizing (OIS) mechanism having a lens holder, at least one magnet, and a plurality of coils; wherein the said plurality of coils of the OIS mechanism operatively associates with the said at least one magnet of the OIS mechanism to move the said lens holder of the OIS mechanism along a direction substantially perpendicular to an optical axis; and
(c) autofocus (AF) mechanism having an AF moving platform movable along the optical axis, at least one coil, and at least one magnet; wherein the said at least one coil of the AF mechanism operatively associates with the said at least one magnet of the AF mechanism to move the said AF moving platform along the optical axis;
(d) wherein one ends of the plurality of wires are directly connected to the said lens holder of the OIS mechanism while another ends of the plurality of wires are directly connected to the AF moving platform of the AF mechanism.
2. The lens driving apparatus as claimed in claim 1 , wherein said AF mechanism further comprises:
(a) at least one guiding mechanism;
(b) wherein the said guiding mechanism includes a stationary guide member and a slidable guide member; and
(c) wherein the stationary guide member is firmly mounted on a base while the slidable guide member is firmly mounted on the AF moving platform.
3. The lens driving apparatus as claimed in claim 2 , wherein the said guiding mechanism is selected from the group consisting of guiding shafts, V-shape grooves, dovetail-shaped grooves, C-shaped grooves, guiding planes, guiding holes and guiding rings.
4. The lens driving apparatus as claimed in claim 2 , further comprising a stiffening member connected to the slidable guide member.
5. The lens driving apparatus as claimed in claim 4 , wherein a viscous liquid is provided in a gap between the stiffening member and the lens holder, and/or a gap between the lens holder and the moving platform.
6. The lens driving apparatus as claimed in claim 5 , wherein opposing surfaces of the stiffening member and the lens holder, and/or opposing surfaces of the lens holder and the moving platform are formed with a plurality of pits for receiving therein the viscous liquid.
7. The lens driving apparatus as claimed in claim 1 , wherein the OIS mechanism further comprises a wire coupling member attached to the lens holder, and wherein one end of each wire is coupled to the wire coupling member.
8. The lens driving apparatus as claimed in claim 7 , wherein the wire coupling member is in the form of a printed circuit board with conductive traces and bonding pads provided thereon.
9. The lens driving apparatus as claimed in claim 7 , wherein the wire coupling member is made of plastics, polymers, metal, ceramic, or a composite material made of plastic, polymers, metal, or ceramic.
10. The lens driving apparatus as claimed in claim 7 , wherein the wire coupling member is integrated into the lens holder.
11. The lens driving apparatus as claimed in claim 1 , wherein the AF moving platform further comprises a wire coupling member, and wherein one end of each wire is coupled to the wire coupling member.
12. The lens driving apparatus as claimed in claim 11 , wherein the wire coupling member is in the form of a printed circuit board with conductive traces and bonding pads provided thereon.
13. The lens driving apparatus as claimed in claim 1 , wherein the plurality of wires is selected from the group consisting of metal wire, enamel metal wire, metal-clad metal wire, metal-clad plastic wire and combinations thereof.
14. The lens driving apparatus as claimed in claim 1 , wherein the plurality of wires comprises materials selected from the group consisting of conductive materials, non-conductive materials, polymeric materials, plastics, rubbers and organic fibers.
15. The lens driving apparatus as claimed in claim 1 , wherein the said AF mechanism further comprises a printed circuit board or flexible printed circuit board to provide electric connection.
16. The lens driving apparatus as claimed in claim 1 , wherein the AF mechanism and/or the OIS mechanism further comprises at least one Hall sensor or position encoder to sense position of a lens.
17. The lens driving apparatus as claimed in claim 1 , wherein the AF mechanism comprises at least one spring with one end connected to a base of the AF mechanism and the other end connected to the AF moving platform.
18. The lens driving apparatus as claimed in claim 17 , wherein the spring is selected from the group consisting of leaf spring, helix spring and elastic film.
19. The lens driving apparatus as claimed in claim 18 , further comprising at least one Hall sensor or position encoder to sense position of a lens.
20. An electronic image-capturing device comprising the lens driving apparatus claimed in claim 1 .