US 12,066,691 B2
Lens driving module, photographing camera and electronic device
Hao Jan Chen, Taichung (TW); Yu Chen Lai, Taichung (TW); Ming-Ta Chou, Taichung (TW); and Te-Sheng Tseng, Taichung (TW)
Assigned to LARGAN DIGITAL CO., LTD., Taichung (TW)
Filed by LARGAN DIGITAL CO., LTD., Taichung (TW)
Filed on Apr. 23, 2021, as Appl. No. 17/239,228.
Claims priority of application No. 110103923 (TW), filed on Feb. 3, 2021.
Prior Publication US 2022/0244486 A1, Aug. 4, 2022
Int. Cl. G02B 7/09 (2021.01); G03B 13/36 (2021.01)
CPC G02B 7/09 (2013.01) [G03B 13/36 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A lens driving module, configured to provide an imaging lens system with auto-focus functionality, the imaging lens system comprising a plurality of lens elements and at least one displaceable lens carrier, the plurality of lens elements arranged along an optical axis of the imaging lens system, at least one of the plurality of lens elements disposed on the at least one displaceable lens carrier, and the at least one displaceable lens carrier being displaceable along the optical axis;
wherein the lens driving module comprises a preloading element, a driving base and at least one first magnet, and the at least one first magnet is disposed on the at least one displaceable lens carrier;
wherein the preloading element comprises:
an injection molded part, comprising a plurality of mounting structures, wherein at least one rollable element is disposed in each of the plurality of mounting structures, and the at least one rollable element is in contact with the at least one displaceable lens carrier and configured to provide the at least one displaceable lens carrier with a degree of freedom in a direction parallel to the optical axis; and
a ferromagnetic part, at least partially embedded in the injection molded part, wherein the ferromagnetic part and the at least one first magnet together generate a magnetic attraction force, such that the at least one displaceable lens carrier exerts a preloading force on the at least one rollable element in each of the plurality of mounting structures;
wherein the driving base comprises:
at least one driving coil, disposed corresponding to the at least one first magnet, wherein the at least one driving coil and the at least one first magnet are configured to generate a driving force so as to drive the at least one displaceable lens carrier to move along the optical axis; and
an electrical wiring pattern, electrically connected to the at least one driving coil;
wherein the at least one driving coil and the at least one rollable element are located on opposite sides of the at least one displaceable lens carrier in a direction of the preloading force;
wherein the imaging lens system is disposed between the preloading element and the at least one driving coil, and the at least one driving coil and the preloading element are located on opposite sides of the at least one displaceable lens carrier in the direction of the preloading force;
wherein the at least one driving coil comprises one or more driving coils, all of the one or more driving coils are located at a same side of the at least one displaceable lens carrier in the direction of the preloading force, the at least one rollable element comprises one or more rollable elements, and all of the one or more rollable elements are located at a same side of the at least one displaceable lens carrier in the direction of the preloading force.