KR20230022929A - Lens driving device and camera module - Google Patents

Abstract

The present embodiment relates to a camera module comprising: a printed circuit board; an image sensor arranged on the printed circuit board; a housing arranged on top of the printed circuit board; a bobbin arranged inside the housing; a lens combined with the bobbin and arranged on top of the image sensor; a magnet arranged on the bobbin; a coil arranged on the housing and facing the magnet; a supporting member combined with the housing and the bobbin and electrically connected to the printed circuit board; and an iris arranged on the bobbin and electrically connected to the supporting member, wherein the iris includes a first elastic member deformed depending on the application of current. Therefore, provided is a lens driving device including an iris that does not generate magnetic field interference with an actuator for performing AF drive, etc.

Description

Lens driving device and camera module {Lens driving device and camera module}

This embodiment relates to a lens driving device and a camera module.

The contents described below provide background information on the present embodiment, but do not describe the prior art.

As the distribution of various portable terminals is widely generalized and wireless Internet services are commercialized, consumers' demands related to portable terminals are also diversifying, and various types of additional devices are being installed in portable terminals.

Among them, a typical example is a camera module that takes a picture or video of a subject. Recently, a technology for applying an aperture to a camera module has been developed. When a magnet is used to drive the aperture, there is a problem that the magnetic force of the magnet affects AF driving. Furthermore, there is a problem in that the size increases due to the use of a magnet and a coil.

(Patent Document 1) KR 10-2010-0138269 A

The present embodiment is intended to provide a lens driving device including an actuator that performs AF driving and the like and a diaphragm that does not generate magnetic field interference.

In addition, it is intended to provide a lens driving device capable of miniaturization.

It is intended to provide a camera module including the lens driving device.

The camera module according to this embodiment includes a printed circuit board; an image sensor disposed on the printed circuit board; a housing disposed on the printed circuit board; a bobbin disposed inside the housing; a lens coupled to the bobbin and disposed over the image sensor; a magnet disposed on the bobbin; a coil disposed in the housing and facing the magnet; a support member coupled to the housing and the bobbin and electrically connected to the printed circuit board; and a diaphragm disposed on the bobbin and electrically connected to the support member, wherein the diaphragm may include a first elastic member that is deformed according to application of current.

The diaphragm includes a movable part coupled to the first elastic member and moving according to deformation of the first elastic member, and two blades coupled to the movable part, and the two blades move in opposite directions according to the movement of the movable part. can move to

The diaphragm may further include a second elastic member that is deformed according to application of current and coupled to the movable part, and the second elastic member may move the movable part in a direction opposite to that of the first elastic member according to application of current. there is.

When current is applied to the first elastic member, the movable part moves in a first direction from an initial position, and the aperture presses the movable part in a second direction opposite to the first direction so that the movable part returns to the initial position. It may further include a third elastic member to.

The movable part rotates according to the deformation of the first elastic member, and the two blades may move in opposite directions according to the rotation of the movable part.

The degree of deformation of the first elastic member may vary according to the amount of current applied thereto.

The camera module may further include a control unit that detects a degree of deformation of the first elastic member in real time and controls an amount of current applied to the first elastic member.

The support member extends from a first coupling portion coupled to the housing, a second coupling portion coupled to the bobbin, a connection portion connecting the first coupling portion and the second coupling portion, and the first coupling portion. A terminal portion coupled to the printed circuit board may be included, and the support member may include a flexible board.

The lens may include a first lens unit and a second lens unit spaced apart from each other, and at least a portion of the diaphragm may be disposed between the first lens unit and the second lens unit.

A lens driving device according to this embodiment includes a housing; a bobbin disposed inside the housing; a first driving unit disposed on the bobbin; a second driving unit disposed in the housing and facing the first driving unit; a support member coupled to the housing and the bobbin; and an aperture disposed on the bobbin and electrically connected to the support member, wherein the aperture controls an amount of light passing through the aperture in conjunction with an elastic member that is deformed according to the application of current and the deformation of the elastic member. It may include a blade that does.

Through this embodiment, magnetic field interference between the diaphragm and the actuator can be prevented.

In addition, by omitting members such as magnets, coils, and yokes, it is possible to miniaturize the product size.

In addition, since a closed loop is implemented in the shape memory alloy controller (SMA controller), there is an advantage in that a Hall element is unnecessary.

Fig. 1 is a perspective view showing some configurations of a lens driving device according to this embodiment (first embodiment).
Fig. 2 is a perspective view showing the structure related to the mover of the lens driving device according to the present embodiment.
Fig. 3 is a side view showing a stator and related components of the lens driving device according to the present embodiment.
Fig. 4 is a conceptual diagram showing a mover, a diaphragm, and related components of the lens driving device according to the present embodiment.
5 is a conceptual diagram for explaining the operation of the diaphragm of the lens driving device according to the present embodiment.
Fig. 6 is a conceptual diagram showing an aperture of a lens driving device according to a modified example (second embodiment).
7 is a side view of FIG. 6 viewed from the side.
8 is a conceptual diagram illustrating an aperture of a lens driving device according to another modified example (third embodiment).

Hereinafter, for convenience of description, some embodiments of the present invention will be described through exemplary drawings. However, the technical idea of the present invention is not limited to some of the described examples.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term.

When an element is described as being 'connected' or 'coupled' to another element, that element may be directly connected or coupled to the other element, but there is another element between the element and the other element. It should be understood that elements may be 'connected' or 'coupled'.

An 'optical axis direction' used below is defined as an optical axis direction of a lens coupled to a lens driving device. Meanwhile, the 'optical axis direction' may correspond to 'up and down directions' and 'z-axis directions'.

The 'auto focus function' used below is to adjust the distance to the image sensor by moving the lens in the direction of the optical axis according to the distance of the subject so that a clear image of the subject can be obtained from the image sensor. defined as a function. Meanwhile, 'auto focus' may be used interchangeably with 'auto focus (AF)'.

As used below, 'transformation' refers to a change in shape, form, or volume.

As used below, 'to move' refers to a change in a stopped posture or place. That is, 'moving' includes the meanings of 'rotating' and 'moving'.

Hereinafter, the configuration of the optical device according to the present embodiment will be described.

The optical device is any one of mobile phones, mobile phones, smart phones, portable smart devices, digital cameras, laptop computers, digital broadcasting terminals, personal digital assistants (PDA), portable multimedia players (PMPs), and navigation devices. can be However, the type of optical device is not limited thereto, and any device for taking a video or photo may be included in the optical device.

The optical device may include a body. The main body may form the appearance of the optical device. The main body may accommodate the camera module. A display unit may be disposed on one surface of the main body. For example, a display unit and a camera module may be disposed on one surface of the main body, and a camera module may be additionally disposed on the other surface (a surface positioned opposite to the one surface) of the main body.

The optical device may include a display unit. The display unit may be disposed on one surface of the main body. The display unit may output an image captured by the camera module.

The optical device may include a camera module. The camera module may be disposed on the main body. At least a part of the camera module may be accommodated inside the main body. A plurality of camera modules may be provided. The camera module may be disposed on one surface of the main body and the other surface of the main body. The camera module may capture an image of a subject.

Hereinafter, the configuration of the camera module according to the present embodiment will be described.

The camera module may include a lens module. A lens module may include at least one lens. A lens module may include a lens and a barrel. The lens module may be coupled to the bobbin 210 of the lens driving device. The lens module may be coupled to the bobbin 210 by screwing and/or adhesive. The lens module may move integrally with the bobbin 210 . A lens may be coupled to the bobbin 210 and disposed over the image sensor. The lens may include a first lens unit and a second lens unit spaced apart from each other. In this case, at least a portion of the aperture 500 may be disposed between the first lens unit and the second lens unit.

The camera module may include a filter. The filter may include an infrared filter. The infrared filter may block light in the infrared region from being incident on the image sensor. An infrared filter may be disposed between the lens module and the image sensor. For example, the infrared filter may be disposed on a sensor base (not shown) disposed between the lens driving device and the printed circuit board. Alternatively, an infrared filter may be disposed in the housing 110 .

The camera module may include a printed circuit board. A lens driving device may be disposed on the printed circuit board. In this case, a sensor base may be disposed between the printed circuit board and the lens driving device. The printed circuit board may be electrically connected to the lens driving device. An image sensor may be disposed on the printed circuit board. The printed circuit board may be electrically connected to the image sensor.

The camera module may include an image sensor. The image sensor may be disposed on a printed circuit board. The image sensor may be electrically connected to the printed circuit board. For example, the image sensor may be coupled to a printed circuit board by surface mounting technology (SMT). As another example, the image sensor may be coupled to a printed circuit board by flip chip technology. The image sensor may be disposed such that an optical axis coincides with a lens. That is, the optical axis of the image sensor and the optical axis of the lens may be aligned. The image sensor may convert light irradiated onto an effective image area of the image sensor into an electrical signal. The image sensor may be any one of a charge coupled device (CCD), a metal oxide semi-conductor (MOS), a CPD, and a CID.

The camera module may include a control unit. The control unit may be disposed on a printed circuit board. The controller may control the direction, intensity, amount, and amplitude of the current supplied to the coil 120 of the lens driving device. The controller may perform an autofocus function by controlling the lens driving device. Furthermore, the controller may perform autofocus feedback control for the lens driving device. The control unit may control the direction, strength, amount, and amplitude of current supplied to the first elastic member 510 of the aperture 500 of the lens driving device. The controller may control the diaphragm 500 to adjust the amount of light passing through the diaphragm 500 . The control unit may detect the degree of deformation of the first elastic member 510 in real time and control the amount of current applied to the first elastic member 510 . That is, the control unit may perform feedback control on the first elastic member 510 of the aperture 500 .

Hereinafter, the configuration of the lens driving device according to the present embodiment (first embodiment) will be described with reference to the drawings.

Fig. 1 is a perspective view showing some configurations of a lens driving device according to this embodiment (first embodiment), and Fig. 2 is a perspective view showing the mover and related components of the lens driving device according to this embodiment. 3 is a side view showing the stator and related components of the lens driving device according to the present embodiment, FIG. 4 is a conceptual diagram showing the mover, the diaphragm, and related components of the lens driving device according to the present embodiment, and FIG. It is a conceptual diagram for explaining the operation of the diaphragm of the lens driving device according to the present embodiment.

The lens driving device may be a voice coil motor (VCM). The lens driving device may perform an auto focus (AF) function. The lens driving device may perform auto focus feedback (AF feedback) control. In this case, the lens driving device may be referred to as 'closed loop auto focus (CLAF) VCM'. The lens driving device may perform an optical image stabilization (OIS) function. At this time, the lens driving device may be referred to as an 'OIS module'. The lens driving device may perform image stabilization feedback control.

The lens driving device may include the stator 100 . The stator 100 may be a member that does not move (fixed) with respect to the printed circuit board and the image sensor fixed to the printed circuit board. The stator 100 may move the mover 200 .

The stator 100 may include a housing 110 . The housing 110 may be disposed above the printed circuit board. The housing 110 may be spaced apart from the bobbin 210 . The housing 110 may be disposed outside the bobbin 210 . A coil 120 may be coupled to the housing 110 . The housing 110 may be coupled to the cover. The housing 110 is formed of an insulating material and may be formed as an injection molding product in consideration of productivity.

The housing 110 includes a holder portion 110a including a lower plate in which a hole is formed and three side plates extending from the edge of the lower plate, and is formed as a separate member and coupled to the base to correspond to the side plate of the holder portion 110a. It may include a coupling part (110b) disposed. A bobbin 210 may be disposed inside the holder portion 110a of the housing 110 . The substrate 130 and the coil 120 may be disposed on the coupling portion 110b of the housing 110 . Alternatively, the holder portion 110a and the coupling portion 110b may be integrally formed.

The housing 110 may include a protrusion 111 . The protrusion 111 may protrude from the upper surface of the lower plate of the housing 110 . The protrusion 111 may be inserted into the hole of the support member 400 .

The stator 100 may include a coil 120 . Coil 120 may be disposed in housing 110 . The coil 120 may face the magnet 220 . The coil 120 may be disposed at a position corresponding to the magnet 220 . Through this structure, when power is applied to the coil 120, the coil 120 and the magnet 220 may have electromagnetic interaction. That is, when power is applied to the coil 120, the magnet 220 may move. At this time, the magnet 220 may move integrally with the bobbin 210 .

The stator 100 may include a substrate 130 . The substrate 130 may be electrically connected to the coil 120 . The substrate 130 may supply power to the coil 120 . The substrate 130 may be disposed on the housing 110 . The substrate 130 may be disposed on the coupling part 110b of the housing 110 . The substrate 130 may be disposed inside the housing 110 . The substrate 130 may be vertically disposed on the housing 110 .

The substrate 130 may include a terminal 131 . The terminal 131 may be disposed on the bottom of the board 130 . The terminal 131 may be coupled to the printed circuit board by soldering. The terminal 131 may be electrically connected to the printed circuit board.

The stator 100 may include a cover (not shown). The cover may be coupled to the housing 110 therein. The cover may accommodate at least a portion of the housing 110 therein. The cover may form an exterior of the lens driving device. The cover may have a hexahedral shape with an open lower surface. The cover may be non-magnetic. The cover may be formed of a metal material. The cover may be formed of a metal plate. The cover may be connected to the ground portion of the printed circuit board. Through this, the cover can be grounded. The cover can block electromagnetic interference (EMI). At this time, the cover may be referred to as an 'EMI shield can'. The cover may include a top plate and a side plate. The cover may include a top plate and side plates extending downward from an outer periphery or edge of the top plate.

The lens driving device may include the mover 200 . The mover 200 can move relative to the printed circuit board and the image sensor fixed to the printed circuit board. A lens may be coupled to the mover 200 . The mover 200 may move through interaction with the stator 100 . AF driving may be realized according to the movement of the mover 200 . In this embodiment, the diaphragm 500 may be disposed on the mover 200 . That is, the mover 200 and the diaphragm 500 may move integrally.

The mover 200 may include a bobbin 210 . The bobbin 210 may be disposed inside the housing 110 . The bobbin 210 may be spaced apart from the housing 110 . A magnet 220 may be coupled to the bobbin 210 . An aperture 500 may be coupled to the bobbin 210 . The bobbin 210 may be integrally formed with the aperture 500 . The bobbin 210 may move integrally with the aperture 500 . The bobbin 210 may be placed inside the cover. The bobbin 210 may be coupled to the lens module. An outer circumferential surface of the lens module may be coupled to an inner circumferential surface of the bobbin 210 . The bobbin 210 may be movably supported with respect to the housing 110 . The bobbin 210 may move in the optical axis direction with respect to the housing 110 .

The mover 200 may include a magnet 220 . The magnet 220 may be disposed on the bobbin 210 . The magnet 220 may be coupled to the bobbin 210 . The magnet 220 and the bobbin 210 may move integrally. The magnet 220 may face the coil 120 . Through such a structure, the magnet 220 may interact with the coil 120 electromagnetically. The magnet 220 may move through electromagnetic interaction with the coil 120 . As a modified example, the magnet 220 and the coil 120 may be disposed by replacing each other. That is, the magnet 220 may be disposed on the housing 110 and the coil 120 may be disposed on the bobbin 210 .

The lens driving device may include a guide member 300 . The guide member 300 may be disposed between the bobbin 210 and the housing 110 . The guide member 300 may contact the bobbin 210 and the housing 110 . Through this structure, the guide member 300 may guide the movement of the bobbin 210 when the bobbin 210 moves relative to the housing 110 . The guide member 300 may guide movement of the bobbin 210 in vertical directions (z-axis direction and optical axis direction). The guide member 300 may be provided in two pieces and disposed one by one on both sides of the coil 120 . As a modified example, a total of four guide members 300 may be provided, two each on one side. The guide member 300 may include a ball.

The lens driving device may include a support member 400 . The support member 400 may be coupled to the bobbin 210 . The support member 400 may be coupled to the housing 110 . The support member 400 may be coupled to the bobbin 210 and the housing 110 . Support member 400 may have elasticity in at least a part. The support member 400 may include a flexible substrate. The support member 400 may include a Flexible Printed Circuit Board (FPCB). The support member 400 may be formed by bending the FPCB multiple times. The support member 400 may be integrally formed. Alternatively, the support member 400 may be an elastic member such as a leaf spring. The support member 400 may be electrically connected to the printed circuit board. The support member 400 may be electrically connected to the aperture 500 .

The support member 400 includes a first coupling portion 410 coupled to the housing 110, a second coupling portion 420 coupled to the bobbin 210, the first coupling portion 410 and the second coupling portion. It may include a connecting portion 430 connecting the 420 and a terminal portion 440 extending from the first coupling portion 410 and coupled to the printed circuit board.

The support member 400 may include a first coupling part 410 . The first coupling part 410 may be coupled to the housing 110 . The first coupling part 410 may include a hole coupled to the protrusion 111 of the housing 110 . The first coupler 410 may be provided in two and disposed on both sides of the substrate 130 .

The support member 400 may include a second coupling part 420 . The second coupling part 420 may be coupled to the bobbin 210 . The second coupling part 420 may include a hole coupled with a protrusion (not shown) protruding from the lower surface of the bobbin 210 . The second coupling part 420 may be electrically connected to the first elastic member 510 of the iris 500 .

The support member 400 may include a connecting portion 430 . The connection part 430 may connect the first coupling part 410 and the second coupling part 420 . The connecting portion 430 may have elasticity. The connecting portion 430 may be bent at least twice. The connection part 430 is a first connection part connecting any one of the divided configurations of the second coupling part 410 and the first coupling part 410, and the second coupling part 410 and the first coupling part 410. It may include a second connection unit connecting the other one of the divided components. Each length of the first connection part and the second connection part may be about three times the distance between the first coupling part 410 and the second coupling part 420 . Each length of the first connection part and the second connection part may be 2.5 times or more and 3 times or less of the distance between the first coupling part 410 and the second coupling part 420 . Through this structure, the connection part 430 can secure the required elasticity.

The support member 400 may include a terminal portion 440 . The terminal portion 440 may extend from the first coupling portion 410 . The terminal unit 440 may be coupled to the printed circuit board. The terminal unit 440 may be coupled to the printed circuit board by soldering. The terminal unit 440 may include a plurality of terminals. The terminal unit 440 may be divided into two and disposed on both sides of the board 130 .

The lens driving device may include an AF sensor (not shown). The AF sensor may be used for auto focus feedback. The AF sensor may detect the position of the magnet 220 disposed on the bobbin 210 . The AF sensor may be disposed in the housing 110 . The AF sensor may be disposed on the substrate 130 . The AF sensor may be disposed in a space between the closed curve coils 120 . The AF sensor may include a hall sensor. At this time, the hall sensor may detect the position of the magnet 220 by sensing the magnetic field of the magnet 220 .

The lens driving device may include the diaphragm 500 . The aperture 500 may be disposed on the bobbin 210 . The aperture 500 may be electrically connected to the support member 400 . The aperture 500 may include a first elastic member 510 that is deformed according to the application of current. The aperture 500 includes a movable part 520 coupled to the first elastic member 510 and moving according to deformation of the first elastic member 510, and two blades 530 and 540 coupled to the movable part 520. can include The diaphragm 500 includes an elastic member 510 that is deformed according to the application of current, and blades 530 and 540 that control the amount of light passing through the diaphragm 500 in conjunction with the deformation of the elastic member 510. can do.

The aperture 500 may include a first elastic member 510 . The first elastic member 510 may be a shape memory alloy (SMA). The degree of deformation of the first elastic member 510 may vary according to the amount of current applied thereto. At this time, the first elastic member 510 may have a linear relationship between the amount of current applied and the amount of deformation within a certain range. In this embodiment, the current in the linear deformation section of the first elastic member 510 may be used to control the aperture 500 . When the first elastic member 510 is a shape memory alloy, as shown in FIG. 5 , when a current is applied, the first elastic member 510 contracts, and when a current is cut off, the first elastic member 510 can be stretched. there is.

The aperture 500 may include a movable part 520 . The movable part 520 may interlock with the first elastic member 510 . The movable part 520 may rotate according to the deformation of the first elastic member 510 . The movable part 520 may rotate about a central axis. The movable part 520 may include a first coupling portion coupled to the first blade 530 and a second coupling portion coupled to the second blade 540 .

The aperture 500 may include two blades 530 and 540. The aperture 500 may include first and second blades 530 and 540 . The two blades 530 and 540 may move in opposite directions according to the movement of the movable part 520 . The two blades 530 and 540 may move in opposite directions as the movable part 520 rotates. Through this structure, the size of a hole through which light passes in the aperture 500 can be reduced or increased.

Hereinafter, the operation of the camera module according to the present embodiment will be described.

First, AF driving and AF feedback control will be described. When current is applied sequentially to the printed circuit board, the substrate 130 and the coil 120, an electromagnetic field is generated around the coil 120 and the magnet 220 facing the coil 120 moves. At this time, the bobbin 210 to which the magnet 220 is fixed moves integrally with the magnet 220, and the lens coupled to the bobbin 210 also moves integrally with the bobbin 210. By such movement, the lens moves in a direction closer to or farther from the image sensor disposed on the printed circuit board, so focus adjustment can be performed. Further, the AF sensor detects the magnet 220, and through this, the controller calculates the position of the lens and determines whether or not to additionally move the lens. Since such feedback control is performed in real time, a more precise auto focus function can be performed.

Furthermore, the diaphragm driving is explained. When a current is applied to the first elastic member 510, which is a shape memory alloy, the movable part 520 rotates around the central axis due to contraction of the first elastic member 510. At this time, the first blade 530 and the second blade 540 respectively coupled to both sides of the movable part 520 move in opposite directions and are formed between the first blade 530 and the second blade 540 The size of the hole is adjusted to adjust the amount of light passing through the diaphragm 500 .

Hereinafter, the configuration of a lens driving device according to a modified example (second embodiment) will be described with reference to the drawings.

FIG. 6 is a conceptual diagram illustrating a diaphragm of a lens driving device according to a modified example (second embodiment), and FIG. 7 is a side view of FIG. 6 viewed from the side.

A lens driving device according to the second embodiment may include a stator 100 , a mover 200 , a guide member 300 , a support member 400 and a diaphragm 500 . However, the stator 100, the mover 200, the guide member 300, the support member 400, and the diaphragm 500 of the lens driving device according to the second embodiment are described in the foregoing first embodiment. analogy can be applied. Hereinafter, differences between the first embodiment and the second embodiment will be mainly described.

The movable part 520 includes a body part 521 that rotates around a central axis and is coupled to the first and second blades 530 and 540, and extends from the body part 521 and includes a first elastic member 510 and a second part. 2 may include a coupling portion 522 coupled to the elastic member 550. An upper portion of the coupling portion 522 may be coupled with the second elastic member 550 and a lower portion of the coupling portion 522 may be coupled with the first elastic member 510 . Alternatively, a lower portion of the coupling portion 522 may be coupled to the second elastic member 550 and an upper portion of the coupling portion 522 may be coupled to the first elastic member 510 .

The first elastic member 510 may include a coupling part 511 . The coupling part 511 may include soldering. The coupling portion 511 may be a portion connecting the SMA wire of the first elastic member 510 and the conductive line. The coupling part 511 is a fixed part and may be referred to as a 'fixing part'. Accordingly, the first elastic member 510 may be contracted and stretched based on the coupling part 511 . The second elastic member 510 may also include a coupling part 511 .

The aperture 500 may include a second elastic member 550 that is deformed according to the application of current and coupled to the movable part 520 . The second elastic member 550 may move the movable part 520 in a direction opposite to that of the first elastic member 510 according to the application of current. In more detail, the first elastic member 510 may rotate the movable part 520 in a first direction (see A in FIG. 6), and the second elastic member 550 may rotate the movable part 520 in the first direction (A). ) and the opposite second direction (see B in FIG. 6). Due to the nature of the shape memory alloy (SMA), the speed at which the first elastic member 510 shrinks when current is applied is instantaneous, but the speed at which the first elastic member 510 is stretched when current is cut off may not be immediate. In the second embodiment, the movable part 520 is provided with a second elastic member 520 that moves the movable part 520 in the opposite direction to the first elastic member 510, so that the movable part 520 moves in the first direction A and the second direction B. ) so that everyone can move immediately.

Hereinafter, the configuration of a lens driving device according to another modified example (third embodiment) will be described with reference to the drawings.

8 is a conceptual diagram illustrating an aperture of a lens driving device according to another modified example (third embodiment).

A lens driving device according to the third embodiment may include a stator 100 , a mover 200 , a guide member 300 , a support member 400 and a diaphragm 500 . However, the stator 100, the mover 200, the guide member 300, the support member 400, and the aperture 500 of the lens driving device according to the third embodiment are described in the foregoing first embodiment. analogy can be applied. Hereinafter, differences between the first embodiment and the third embodiment will be mainly described.

The movable part 520 includes a body part 521 that rotates around a central axis and is coupled to the first and second blades 530 and 540, and extends from the body part 521 and includes a first elastic member 510 and a second part. 3 may include a coupling part 522 coupled to the elastic member 560.

The first elastic member 510 may include a coupling part 511 . The coupling part 511 may include soldering. The coupling portion 511 may be a portion connecting the SMA wire of the first elastic member 510 and the conductive line. The coupling part 511 is a fixed part and may be referred to as a 'fixing part'. Accordingly, the first elastic member 510 may be contracted and stretched based on the coupling part 511 .

When current is applied to the first elastic member 510, the movable part 520 may move in a first direction (see A in FIG. 8) from an initial position. At this time, the aperture 500 is a third elastic member that presses the movable part 520 in a second direction (see B in FIG. 8 ) opposite to the first direction A so that the movable part 520 returns to the initial position ( 560) may be included. However, when the third elastic member 560 presses the coupling part 522 of the movable part 520 in the third direction (see C in FIG. 8 ), the body part 521 of the movable part 520 moves in the second direction (B). ) can be described as being rotated. The third elastic member 560 may be a wire. The third elastic member 560 may not be SMA. The third elastic member 560 may maintain a state of pressurizing the movable part 520 . At this time, when a current is applied to the first elastic member 510, the force of the first elastic member 510 can overcome the pressing force of the third elastic member 560 to rotate the movable part 520. Meanwhile, when the current applied to the first elastic member 510 is blocked, the movable part 520 may return to its original state by the pressing force of the third elastic member 560 .

As described in the second embodiment, the speed at which the first elastic member 510 contracts is instantaneous when current is applied due to the nature of the shape memory alloy (SMA), but when the current is cut off, the first elastic member 510 is stretched. Speed may not be instantaneous. In the third embodiment, the movable part 520 is provided with a third elastic member 530 that moves the movable part 520 in the opposite direction to the first elastic member 510, so that the movable part 520 moves in the first direction A and the second direction B. ) so that everyone can move immediately.

A modified example may use a magnet for driving the aperture (IRIS). However, when a magnet is used, other actuators and systems may be interfered with by forming a magnet field. In addition, since a coil must be used due to the use of a magnet, the size can be increased.

Accordingly, in this embodiment, the magnet structure is changed to a shape memory alloy (SMA) applied structure. In this embodiment, the size can be minimized by changing the structure of the drive unit. In addition, it can be used with existing AF/OIS actuators because it is not affected by magnetic materials.

In this embodiment, the driving unit of the diaphragm can be controlled by applying SMA. Through this, the magnet, coil, and yoke of the modified example can be removed. In this embodiment, magnetic field interference can be eliminated while applying blade drive to SMA. In addition, this embodiment has the advantage of being able to be mounted on mobile and small devices due to its minimized size.

This embodiment can reduce the cost with a simple SMA wire structure. In this embodiment, since a closed loop is implemented in the SMA controller, there is an advantage in that a separate Hall element is unnecessary. In this embodiment, the size can be minimized by removing the magnet, coil, and yoke.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, terms such as 'include', 'comprise' or 'having' described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: stator 200: mover
300: guide member 400: support member
500: Aperture

Claims (20)

housing;
a bobbin disposed within the housing;
a coil and a magnet for moving the bobbin relative to the housing in an optical axis direction; and
Including an aperture disposed on the bobbin,
The diaphragm includes a first blade, a second blade, and a first elastic member that is deformed according to the application of current,
When current is applied to the first elastic member, the size of the hole formed between the first blade and the second blade is changed,
The diaphragm is a camera module that moves together with the bobbin in the optical axis direction. According to claim 1,
The first elastic member is a camera module including a shape memory alloy wire. According to claim 1,
The diaphragm includes a movable part connected to the first elastic member and moving according to deformation of the first elastic member;
The first blade and the second blade are connected to the movable part and move in opposite directions according to the movement of the movable part. According to claim 1,
printed circuit board;
an image sensor disposed on the printed circuit board; and
Including a lens coupled to the bobbin,
The housing is a camera module disposed on the printed circuit board. According to claim 4,
A support member connecting the housing and the bobbin;
The camera module wherein the support member includes a flexible substrate. According to claim 5,
The support member electrically connects the printed circuit board and the aperture to the camera module. According to claim 5,
The support member extends from a first coupling portion coupled to the housing, a second coupling portion coupled to the bobbin, a connection portion connecting the first coupling portion and the second coupling portion, and the first coupling portion. Camera module including a terminal coupled to the printed circuit board. According to claim 7,
The second coupling part of the support member is electrically connected to the first elastic member of the diaphragm. According to claim 1,
Including a ball disposed between the housing and the bobbin,
The ball guides the movement of the bobbin in the optical axis direction. According to claim 3,
The diaphragm includes a second elastic member that is deformed according to the application of current and coupled to the movable part;
The second elastic member moves the movable part in a direction opposite to that of the first elastic member according to the application of current. According to claim 3,
When a current is applied to the first elastic member, the movable part moves in a first direction from an initial position,
A camera module in which a third elastic member is disposed to press the movable part in a second direction opposite to the first direction so that the movable part returns to the initial position. According to claim 1,
The first elastic member has a different degree of deformation depending on the amount of current applied to the camera module. According to claim 1,
A camera module comprising a control unit for detecting a degree of deformation of the first elastic member in real time and controlling an amount of current applied to the first elastic member. According to claim 4,
The lens includes a first lens unit and a second lens unit spaced apart from each other,
At least a portion of the diaphragm is disposed between the first lens unit and the second lens unit. According to claim 1,
Including a substrate disposed in the housing,
The magnet is disposed on the bobbin,
The camera module wherein the coil is disposed on the substrate to face the magnet. housing;
a bobbin disposed within the housing;
a coil and a magnet for moving the bobbin relative to the housing in an optical axis direction; and
Including an aperture disposed on the bobbin,
The diaphragm includes a first blade and a second blade, a first elastic member that is deformed according to the application of current, and a movable part that is connected to the first elastic member and moves according to the deformation of the first elastic member,
When current is applied to the first elastic member, the size of the hole formed between the first blade and the second blade is changed,
The first blade and the second blade are connected to the movable part and move in opposite directions according to the movement of the movable part. According to claim 16,
The first elastic member is a camera module including a shape memory alloy wire. According to claim 16,
A support member connecting the housing and the bobbin;
The camera module of claim 1 , wherein the support member includes a flexible substrate electrically connected to the diaphragm. main body;
The camera module of any one of claims 1 to 18 disposed on the main body; and
An optical device comprising a display disposed on the main body and outputting an image captured by the camera module. housing;
a bobbin disposed within the housing;
a coil and a magnet for moving the bobbin relative to the housing in an optical axis direction; and
A camera module including a support member connecting the housing and the bobbin.

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