Patent ID: 11921349
Assignee: LG INNOTEK CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing;
a magnet disposed on the housing;
a first coil disposed on an outer peripheral surface of the bobbin;
a second coil configured to generate an induced voltage by an interaction with the first coil for detecting a displacement of the bobbin;
a third coil configured to move the housing via an interaction with the magnet;
a magnetic member configured to increase an intensity of the induced voltage of the second coil;
a circuit board disposed below the housing and conductively connected to the second coil, comprising two terminals electrically connected to the second coil;
a capacitor connected to the two terminals;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing; and
a support member connecting the upper elastic member and the circuit board;
wherein the capacitor is connected in parallel to the second coil,
wherein the magnetic member and the second coil are disposed on an outer surface of the housing to suppress influence of the third coil on an output of the second coil, and
wherein the first coil moves together with the bobbin and a distance between the first coil and the second coil varies, and the induced voltage is generated in the second coil based on variation in the distance.