US-20260126667-A1 - LENS DRIVING DEVICE, AND CAMERA MODULE AND OPTICAL DEVICE INCLUDING SAME

US20260126667A1US 20260126667 A1US20260126667 A1US 20260126667A1US-20260126667-A1

Abstract

An embodiment comprises: a circuit board; a housing disposed on the circuit board; a bobbin disposed within the housing; a magnet disposed in the housing; a coil disposed on the bobbin to move the bobbin in an optical-axis direction by interaction with the magnet; an upper elastic member coupled to the bobbin and the housing; and a polymer actuator coupled at one end thereof to the upper elastic member, wherein the circuit board is electrically connected to the polymer actuator to supply a first driving signal to the polymer actuator, and the polymer actuator moves the housing in a direction perpendicular to the optical-axis direction by the first driving signal.

Inventors

Sang Ok Park

Assignees

LG INNOTEK CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251229
Priority Date: 20201015

Claims (17)

1 . A lens moving apparatus comprising: a housing; a bobbin disposed in the housing; a first driving unit configured to move the bobbin relative to the housing in an optical-axis direction; a first board disposed on one side of the housing; a first elastic member connecting the housing and the bobbin; and a second driving unit electrically connecting the first board and the first elastic member and configured to move the bobbin relative to the first board in a direction perpendicular to the optical-axis direction, wherein the second driving unit comprises a polymer.
2 . The lens moving apparatus according to claim 1 , wherein the polymer comprises a first portion coupled to the first board and a second portion coupled to the first elastic member, and wherein, when a current is applied to the polymer, the second portion moves relative to the first portion in the direction perpendicular to the optical-axis direction.
3 . The lens moving apparatus according to claim 1 , wherein the second driving unit comprises: a first sub-driving unit configured to move the bobbin relative to the first board in a first direction perpendicular to the optical-axis direction; and a second sub-driving unit configured to move the bobbin relative to the first board in a second direction perpendicular to both the optical-axis direction and the first direction.
4 . The lens moving apparatus according to claim 3 , wherein the first elastic member comprises: a first elastic unit electrically connected to a first surface of the first sub-driving unit; a second elastic unit electrically connected to a second surface of the first sub-driving unit opposite to the first surface; a third elastic unit electrically connected to a first surface of the second sub-driving unit; and a fourth elastic unit electrically connected to a second surface of the second sub-driving unit opposite to the first surface.
5 . The lens moving apparatus according to claim 3 , wherein the first board comprises a first corner region and a second corner region disposed opposite to each other, and a third corner region and a fourth corner region disposed opposite to each other, wherein the first sub-driving unit comprises a first polymer actuator disposed in the first corner region, and a second polymer actuator disposed in the second corner region, and wherein the second sub-driving unit comprises a third polymer actuator disposed in the third corner region, and a fourth polymer actuator is disposed in the fourth corner region.
6 . The lens moving apparatus according to claim 5 , wherein the first elastic member comprises: a first elastic unit electrically connected to a first surface of the first polymer actuator; a second elastic unit electrically connected to a second surface of the first polymer actuator opposite to the first surface of the first polymer actuator; a third elastic unit electrically connected to both a first surface of the second polymer actuator and a second surface of the second polymer actuator opposite to the first surface of the second polymer actuator; a fourth elastic unit electrically connected to both a first surface of the third polymer actuator and a second surface of the third polymer actuator opposite to the first surface of the third polymer actuator; a fifth elastic unit electrically connected to a first surface of the fourth polymer actuator; and a sixth elastic unit electrically connected to a second surface of the fourth polymer actuator opposite to the first surface of the fourth polymer actuator.
7 . The lens moving apparatus according to claim 1 , wherein the first driving unit comprises a first magnet disposed on the housing, and a coil disposed on the bobbin and facing the first magnet.
8 . The lens moving apparatus according to claim 7 , comprising: a second magnet disposed on the bobbin; a second board disposed on the housing; and a sensor disposed on the second board and configured to detect the second magnet.
9 . The lens moving apparatus according to claim 8 , comprising: a second elastic member connecting the housing and the bobbin and disposed on one side of the first elastic member; and a driver IC disposed on the second board and comprising the sensor, wherein the second elastic member comprises a first elastic unit and a second elastic unit spaced apart from each other and electrically connecting the coil and the driver IC.
10 . The lens moving apparatus according to claim 9 , comprising four wires electrically connecting the first board and the second board and spaced apart from the second driving unit.
11 . The lens moving apparatus according to claim 9 , comprising two wires electrically connecting the first board and the driver IC and spaced apart from the second driving unit, wherein the second driving unit comprises a plurality of polymer actuators, wherein at least some of the polymer actuators are electrically connected to the driver IC, wherein the driver IC is driven by alternating current, or by alternating current and direct current, and wherein the polymer actuators are driven by direct current.
12 . The lens moving apparatus according to claim 1 , wherein the second driving unit comprises: a first electrode disposed on a first surface of the polymer; and a second electrode disposed on a second surface of the polymer opposite to the first surface of the polymer, wherein each of the first electrode and the second electrode is formed of an elastic metal.
13 . The lens moving apparatus according to claim 1 , wherein the second driving unit extends in a direction parallel to the optical-axis direction.
14 . The lens moving apparatus according to claim 7 , wherein the second driving unit is spaced apart from the coil and the first magnet, and wherein the second driving unit overlaps the coil and the first magnet in the direction perpendicular to the optical-axis direction.
15 . A camera device comprising: a printed circuit board; an image sensor disposed on the printed circuit board; the lens moving apparatus according to claim 1 disposed on the printed circuit board; and a lens coupled to the bobbin of the lens moving apparatus.
16 . An optical apparatus comprising: a main body; the camera device according to claim 15 disposed in the main body; and a display disposed in the main body and configured to output an image captured by the camera device.
17 . A lens moving apparatus comprising: a housing; a bobbin disposed in the housing; a first magnet and a coil configured to move the bobbin relative to the housing in an optical-axis direction; a base disposed on one side of the housing; and a polymer actuator comprising a polymer, wherein, when a current is applied to the polymer actuator, the polymer actuator moves the bobbin relative to the base in a direction perpendicular to the optical-axis direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 18/249,266, filed Apr. 17, 2023; which is the U.S. national stage application of International Patent Application No. PCT/KR2021/014248, filed Oct. 14, 2021, which claims the benefit under 35 U.S. C. § 119 of Korean Application Nos. 10-2020-0133658, filed Oct. 15, 2020, and 10-2020-0171598, filed Dec. 9, 2020, the disclosures of each of which are incorporated herein by reference in their entirety. TECHNICAL FIELD Embodiments relate to a lens moving apparatus and a camera module and an optical device each including the same. BACKGROUND ART It is difficult to apply technology of a voice coil motor (VCM) used in existing general camera modules to a subminiature, low-power camera module, and therefore research related thereto has been actively conducted. Demand for and production of electronic products, such as smartphones and mobile phones equipped with cameras have increased. Cameras for mobile phones are trending toward increased resolution and miniaturization. As a result, an actuator has also been miniaturized, increased in diameter, and been made multifunctional. In order to realize a high-resolution camera for mobile phones, improvement in performance of the camera for mobile phones and additional functions thereof, such as autofocusing, handshake correction, and zooming, are required. DISCLOSURE Technical Problem Embodiments provide a lens moving apparatus capable of reducing the length or height thereof in the optical-axis direction and of performing OIS operation using a polymer actuator, and a camera module and an optical device each including the lens moving apparatus. Embodiments provides a lens moving apparatus capable of inhibiting drooping of an OIS operation unit caused by gravity or deterioration of performance of AF operation caused by movement and of improving resolution, and a camera module and an optical device each including the lens moving apparatus. Furthermore, embodiments provide a camera module and an optical device each capable of inhibiting errors in AF operation or OIS operation caused by magnetic field interference. In addition, embodiments provide a lens moving apparatus configured to perform OIS operation using a polymer actuator, and a camera module and an optical device each including the lens moving apparatus. Technical Solution A lens moving apparatus according to an embodiment includes a circuit board, a housing disposed on the circuit board, a bobbin disposed in the housing, a magnet disposed on the housing, a coil disposed on the bobbin and configured to move the bobbin in an optical-axis direction by interaction with the magnet, an upper elastic member coupled to the bobbin and to the housing, and a polymer actuator comprising one end coupled to the upper elastic member, wherein the circuit board is conductively connected to the polymer actuator and configured to supply a first drive signal to the polymer actuator, and the polymer actuator is configured to move the housing a direction perpendicular to the optical-axis direction by the first drive signal. The polymer actuator may include a polymer portion and first and second electrodes disposed opposite each other with the polymer portion interposed therebetween, and the first drive signal may be input to the first and second electrodes. The circuit board may include a first pad conductively connected to the first electrode and a second pad conductively connected to the second electrode. The polymer actuator may be bending-deformed in a direction toward the second electrode from the first electrode or in a direction toward the first electrode from the second electrode by the first drive signal. Each of the first and second electrodes may be made of elastic and conductive metal. The upper elastic member may include a first upper elastic unit conductively connected to the first electrode and a second upper elastic unit conductively connected to the second electrode. The coil may be conductively connected to the first upper elastic unit and the second upper elastic unit, and the circuit board may be configured to supply a second drive signal to the first and second electrodes to drive the coil. The first and second electrodes may be disposed so as to face in a diagonal direction of the housing. Alternatively, the first and second electrodes may be disposed so as to face in a direction parallel to one side portion of the housing. The one end of the first electrode may be coupled to the first upper elastic unit and another end of the first electrode may be coupled to the circuit board, and one end of the second electrode may be coupled to the second upper elastic unit and another end of the second electrode may be coupled to the circuit board. The first upper elastic unit may include a first coupler coupled to the housing, a second coupler coupled to the first electrode, and a first connector connecting the first coupler t