KR102617338B1 - A lens moving unit, and camera module and optical instrument including the same - Google Patents

Abstract

The embodiment includes a housing, a bobbin disposed inside the housing and for mounting a lens, a first coil disposed on the outer peripheral surface of the bobbin, a magnet disposed on a side of the housing corresponding to the first coil, and a magnet disposed below the housing. A base disposed, a second coil disposed on the outer surface of the base and generating an induced voltage by interaction with the first coil, and coupled to the bobbin and the housing and spaced apart from each other on the upper surface of the base It includes first to fourth elastic members disposed, wherein each of the first and second elastic members includes a first bonding portion for bonding the first coil and a first connection terminal for electrical connection to the outside. And each of the third and fourth elastic members includes a second bonding part for bonding the second coil, and a second connection terminal for electrical connection to the outside, and the second bonding part and the second Connection terminals are disposed on different outer surfaces of the base.

Description

Lens driving device, and camera module and optical device including the same {A LENS MOVING UNIT, AND CAMERA MODULE AND OPTICAL INSTRUMENT INCLUDING THE SAME}

Embodiments relate to a lens driving device and a camera module and optical device including the same.

Since it is difficult to apply the voice coil motor (VCM) technology used in existing general camera modules to camera modules for ultra-small size and low power consumption, related research has been actively conducted.

Demand and production of electronic products such as smartphones and cell phones equipped with cameras are increasing. Cameras for mobile phones are trending towards higher resolution and miniaturization, and actuators are also becoming smaller, larger in diameter, and multi-functional accordingly. In order to implement a high-resolution mobile phone camera, additional functions such as improved mobile phone camera performance and auto focusing, improved shutter shake, and zoom function are required.

The embodiment provides a lens driving device, a camera module, and an optical device that can prevent disconnection of the second coil for generating induced voltage and secure the resistance value of the second coil for temperature compensation.

A lens driving device according to an embodiment includes a housing; a bobbin disposed inside the housing and for mounting a lens; a first coil disposed on the outer peripheral surface of the bobbin; a magnet disposed on a side of the housing to correspond to the first coil; a base disposed below the housing; a second coil disposed on an outer surface of the base and generating an induced voltage by interaction with the first coil; and first to fourth elastic members coupled to the bobbin and the housing and disposed on the upper surface of the base to be spaced apart from each other, wherein each of the first and second elastic members is used to bond the first coil. a first bonding part for bonding the second coil and a first connection terminal for electrical connection with the outside, and each of the third and fourth elastic members has a second bonding part for bonding the second coil and a first connection terminal for electrical connection with the outside. and a second connection terminal for the base, wherein the second bonding portion and the second connection terminal are disposed on different outer surfaces of the base.

The base may include sides and a corner portion disposed between two adjacent sides of the sides, and each of the second bonding portion and the second connection terminal is connected to two sides adjacent to the corner portion. It may be placed on any corresponding one of the outer surfaces.

Each of the first to fourth elastic members includes an inner frame coupled to the bobbin; an outer frame coupled to the housing; and a connection part connecting the inner frame and the outer frame, wherein the first bonding part is provided in the inner frame, and the second bonding part and the first and second connection terminals may be provided in the outer frame. there is.

The second bonding portion and each of the first and second connection terminals may be bent in a direction from the outer frame toward the base and disposed on an outer surface of the base.

A groove in which the second coil is disposed is provided on the outer surface of the base, and the second bonding part may be disposed on an area of the outer surface of the base located above the groove.

The first and second connection terminals may extend to different areas of the outer surface of the base located below the groove.

First depressions in which each of the first and second connection terminals are disposed may be provided on the outer surface of the base, and second depressions in which the second bonding portion may be disposed may be provided on the outer surface of the base.

Each of the first depressions and the second depressions may include an upper opening open to the upper surface of the base and a lower opening open to the lower surface of the base.

First connection terminals of the first and second elastic members are disposed on the first outer surface of the base, and second connection terminals of the third and fourth elastic members are disposed on the second outer surface of the base, The first outer surface and the second outer surface of the base may be located on opposite sides of each other.

The second bonding portion of the third elastic member is disposed on the third outer surface of the base, and the second bonding portion of the fourth elastic member is disposed on the fourth outer surface of the base, and the third outer surface of the base and The fourth outer surfaces may be located opposite each other.

The width of the second region of the outer frame is greater than the width of the second region of the outer frame and the width of the third region of the outer frame, the second region is an region to which the second connection terminal is connected, and the second region is a region to which the second connection terminal is connected. Area 3 may be an area where the second bonding part is connected, and the first area may be an area connecting the second area and the third area. The second coil may have a ring shape including a straight part and a curved part.

The straight portion of the second coil may be located between first connection terminals disposed on the first outer surface of the base and between second connection terminals disposed on the second outer surface of the base.

The first connection terminals and the second connection terminals overlap the curved portion of the second coil in a first horizontal direction, and the first horizontal direction is perpendicular to the first or second outer surface of the base. It could be a direction.

The first connection terminals and the second connection terminals overlap the straight portion of the second coil in a second horizontal direction, the second horizontal direction is perpendicular to the optical axis, and the first outer surface of the base or the second It may be in a direction parallel to the outer surface.

The second bonding portions of the third and fourth elastic members overlap the curved portion of the second coil in a first horizontal direction, and the first horizontal direction is perpendicular to the first or second outer surface of the base. It can be one direction.

The second bonding portions of the third and fourth elastic members overlap the straight portion of the second coil in a second horizontal direction, the second horizontal direction is perpendicular to the optical axis, and the first outer surface of the base or the first outer surface of the base 2 It may be in a direction parallel to the outer surface.

A driving signal, which is an alternating current signal, may be applied to the first coil, and the induced voltage in response to the driving signal may be generated in the second coil.

A camera module according to an embodiment includes a lens; a lens driving device according to the above-described embodiment that moves the lens; and an image sensor that converts an image incident through the lens driving device into an electrical signal.

An optical device according to an embodiment includes a display module including a plurality of pixels whose colors change by electrical signals; The camera module converts an image incident through a lens into an electrical signal; and a control unit that controls the display module and the camera module.

The embodiment can prevent disconnection of the second coil, secure the resistance value of the second coil for temperature compensation, and easily secure mold manufacturing and injection performance for forming the base.

1 shows a perspective view of a lens driving device according to another embodiment.
FIG. 2 shows an exploded perspective view of the lens driving device shown in FIG. 1.
FIG. 3 shows a combined perspective view of the lens driving device excluding the cover member of FIG. 1.
FIG. 4A is a first perspective view of the bobbin shown in FIG. 1.
Figure 4b is a perspective view of the bobbin and the first coil shown in Figure 1 combined.
Figure 5 shows a perspective view of the housing shown in Figure 1.
Figure 6 shows a perspective view of the housing and magnet combined.
Figure 7 shows a connection diagram of the bobbin, the first coil, the upper elastic member, the lower elastic member, the base, and the second coil.
Figure 8 shows an exploded perspective view of the base to which the second coil is coupled and the lower elastic member.
FIG. 9 shows a perspective view of the second coil, base, and lower elastic member shown in FIG. 8 combined.
Figure 10 shows the arrangement of the second bonding portion and the connection terminal disposed on the base.
FIG. 11 shows a bottom perspective view of the lens driving device of FIG. 2 with the base and magnet omitted.
Figure 12 is a plan view showing the relative arrangement relationship between connection electrodes and the second coil.
FIG. 13 shows a cross-sectional view cut in the CD direction of the lens driving device of FIG. 1.
FIG. 14 shows a cross-sectional view in the AB direction of the lens driving device shown in FIG. 2.
FIG. 15 shows a cross-sectional view in the EF direction of the lens driving device shown in FIG. 1.
FIG. 16A shows a first side view of the lens driving device shown in FIG. 1.
FIG. 16B shows a second side view of the lens driving device shown in FIG. 1.
Figure 17 shows mutual inductance according to the separation distance between the first coil and the second coil.
Figure 18 shows a cross-sectional view of a lens driving device according to another embodiment.
Figure 19 shows a cross-sectional view of a lens driving device according to another embodiment.
Figure 20 shows an exploded perspective view of a camera module according to an embodiment.
Figure 21 shows a perspective view of a portable terminal according to an embodiment.
FIG. 22 shows a configuration diagram of the portable terminal shown in FIG. 21.

Hereinafter, embodiments will be clearly revealed through the accompanying drawings and descriptions of the embodiments. In the description of the embodiment, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or pattern. In the case where it is described as being formed, “on” and “under” include both being formed “directly” or “indirectly through another layer.” do. Additionally, the standards for top/top or bottom/bottom of each floor are explained based on the drawing. Additionally, the same reference numbers indicate the same elements throughout the description of the drawings.

Hereinafter, a lens driving device according to an embodiment will be described as follows with reference to the attached drawings. For convenience of explanation, the lens driving device according to the embodiment is described using a Cartesian coordinate system (x, y, z), but it can also be described using another coordinate system, and the embodiment is not limited to this. In each drawing, the x-axis and y-axis refer to directions perpendicular to the z-axis, which is the optical axis direction. The z-axis direction, which is the optical axis (OA) direction, is called the 'first direction', and the x-axis direction is called the 'second direction.' and the y-axis direction may be referred to as the 'third direction'.

An 'image stabilization device' applied to small camera modules of mobile devices such as smartphones or tablet PCs is a device that prevents the outline of the captured image from being clearly formed due to vibration caused by the user's hand shaking when shooting still images. It may refer to a device configured to do so.

Additionally, an 'autofocusing device' is a device that automatically focuses an image of a subject onto the image sensor surface. Such image stabilization devices and auto-focusing devices can be configured in various ways. The lens driving device according to the embodiment moves an optical module composed of at least one lens in a first direction, or moves an optical module composed of at least one lens in a first direction, or moves a second optical module perpendicular to the first direction. And, by moving on a surface formed in a third direction, an image stabilization operation and/or an auto-focusing operation may be performed.

FIG. 1 shows a perspective view of a lens driving device 100 according to another embodiment, FIG. 2 shows an exploded perspective view of the lens driving device 100 shown in FIG. 1, and FIG. 3 shows the cover member 300 of FIG. 1. A combined perspective view of the lens driving device 100 excluded is shown.

Referring to Figures 1 to 3, the lens driving device 100 includes a bobbin (110), a first coil (120), a magnet (130), a housing (140), an upper elastic member (150), and a lower side. It includes an elastic member 160, a second coil 170, a base 210, and a cover member 300.

First, the cover member 300 will be described.

The cover member 300 includes a bobbin 110, a first coil 120, a magnet 130, a housing 140, an upper elastic member 150, and a lower elastic member in a receiving space formed together with the base 210. The member 160 and the second coil 170 are accommodated.

The cover member 300 may have a box shape with an open bottom and include a top plate 301 and side plates 302, and the lower ends of the side plates 302a to 302d of the cover member 300 are housing ( It may be combined with the outer protrusion 40 of 140). The shape of the upper plate of the cover member 300 may be polygonal, for example, square or octagonal.

The cover member 300 may have a hollow portion in the upper plate 301 that exposes a lens (not shown) coupled to the bobbin 110 to external light. Additionally, in order to prevent foreign substances such as dust or moisture from penetrating into the camera module, a window made of a light-transmissive material may be additionally provided in the hollow of the cover member 300.

The material of the cover member 300 may be a non-magnetic material such as SUS to prevent sticking to the magnet 130, but it may also be made of a magnetic material to function as a yoke.

Next, the bobbin 110 will be described.

FIG. 4A is a first perspective view of the bobbin 110 shown in FIG. 1, and FIG. 4B is a perspective view of the bobbin 110 and the first coil 120 shown in FIG. 1 combined.

Referring to FIGS. 4A and 4B , the bobbin 110 is disposed inside the housing 140 and can move in a first direction by electromagnetic interaction between the coil 120 and the magnet 130.

A lens (not shown) may be directly coupled to the inner peripheral surface 110a of the bobbin 110, but is not limited thereto. For example, the bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed, and the lens barrel may be coupled to the inside of the bobbin 110 in various ways.

The bobbin 110 may have a hollow hole for mounting a lens or lens barrel. The hollow shape of the bobbin 110 may match the shape of the lens or lens barrel on which it is mounted, and may be, for example, circular, oval, or polygonal, but is not limited thereto.

The bobbin 110 has at least one coupling groove or coupling protrusion 113 disposed on the upper surface and coupled to and fixed to the inner frame 151 of the upper elastic member 150, and a lower elastic member 160 disposed on the lower surface. ) may be provided with at least one coupling protrusion 117 that is coupled and fixed to the inner frame 161.

The bobbin 110 may be provided with an upper escape groove 112a provided in an area of the upper surface corresponding to or aligned with the frame connection portion 153 of the upper elastic member 150. Additionally, the bobbin 110 may be provided with a lower escape groove 112b in an area of the lower surface that corresponds to or is aligned with the connection portion 163 of the lower elastic member 160. When the bobbin 110 moves in the first direction by the upper escape groove 112a and the lower escape groove 112b of the bobbin 110, the connection portions 153 and 163 of the upper and lower elastic members 150 and 160 ) and the bobbin 110 can be eliminated, and as a result, the connection portions 153 and 163 of the upper and lower elastic members 150 and 160 can be elastically deformed more easily.

In another embodiment, the connection portion of the upper elastic member and the bobbin are designed so that they do not interfere with each other, so that the upper escape groove and/or the lower escape groove of the bobbin may not be provided.

The bobbin 110 may have at least one groove 105 in which the first coil 120 is disposed on the outer peripheral surface 110b.

The first coil 120 is placed or seated in the groove 105 of the bobbin 110, or the first coil 120 is placed in the groove 105 of the bobbin 110 to rotate clockwise or counterclockwise with respect to the optical axis OA. Coil 120 may be directly wound or coiled.

The shape and number of grooves 105 of the bobbin 110 may correspond to the shape and number of coils disposed on the outer peripheral surface of the bobbin 110. In another embodiment, the bobbin 110 may not have a groove for seating the coil, and the first coil 120 may be directly wound or fixed to the outer peripheral surface of the bobbin 110, which does not have a groove.

Next, the first coil will be described.

The first coil 120 is disposed on the outer peripheral surface 110b of the bobbin 110 and electromagnetic interaction with the magnet 130 disposed in the housing 140.

A driving signal may be applied to the first coil 120 to generate electromagnetic force through electromagnetic interaction with the magnet 130. The driving signal provided at this time may include an alternating current signal or an alternating current signal and a direct current signal. For example, the alternating current signal may be a sinusoidal or pulse signal (eg, a PWM signal).

The bobbin 110 elastically supported by the upper and lower elastic members 150 and 160 may move in the first direction by electromagnetic force resulting from electromagnetic interaction between the first coil 120 and the magnet 130. By adjusting the electromagnetic force, the movement of the bobbin 110 in the first direction can be controlled, thereby performing an auto-focusing function.

The first coil 120 may be wound to surround the outer peripheral surface 110b of the bobbin 110 to rotate clockwise or counterclockwise about the optical axis. For example, the first coil 120 may be disposed or wound within the groove 105 provided on the outer peripheral surface 110b of the bobbin 110.

In another embodiment, the first coil 120 may be implemented in the form of a coil ring wound clockwise or counterclockwise about an axis perpendicular to the optical axis, and the number of coil rings may be the same as the number of magnets 130. However, it is not limited to this.

The first coil 120 may be electrically connected to at least one of the upper or lower elastic members 150 and 160. A driving signal may be applied to the first coil 120 through at least one of the upper or lower elastic members 150 and 160.

Next, the housing 140 will be described.

FIG. 5 shows a perspective view of the housing 140 shown in FIG. 1, and FIG. 6 shows a combined perspective view of the housing 140 and the magnet 130.

Referring to FIGS. 5 and 6 , the housing 140 supports the magnet 130 and accommodates the bobbin 110 inside so that the bobbin 110 can move in the first direction.

The housing 140 may have an overall hollow pillar shape and may include first sides 141 and second sides 142 that form a hollow body.

For example, the housing 140 may have a plurality of sides 14 and 142 forming a polygonal (e.g., square or octagonal) or circular hollow. The upper surface of the plurality of sides 141 and 142 is formed on the housing ( 140) can form the upper surface.

For example, the housing 140 may include first side parts 141 spaced apart from each other and second side parts 142 spaced apart from each other.

For example, the first sides 141 of the housing 140 may be disposed at positions corresponding to the side plates of the cover member 300.

For example, the length of each of the first sides 141 of the housing 140 may be greater than the length of each of the second sides 142. For example, the first sides 141 of the housing 140 may correspond to the sides of the housing 140, and the second sides 142 of the housing 140 may correspond to the corners of the housing 140. This may be the part. The second side 142 of the housing 140 may alternatively be expressed as a “corner portion.”

A magnet 130 may be placed or installed on the first sides 141 of the housing 140. For example, the first sides 141 of the housing 140 may have a groove 141a in which the magnet 130 is seated, placed, or fixed. In Figure 5, the grooves 141a for the magnet are in the form of through grooves, but are not limited thereto and may also be in the form of grooves.

The housing 140 may be provided with a first stopper 143 protruding from the upper surface.

The first stopper 143 of the housing 140 is intended to prevent the cover member 300 from colliding with the housing 140, and when an external impact occurs, the upper surface of the housing 140 touches the upper part of the cover member 300. It can prevent direct collision with the inner surface.

Additionally, the upper surface of the housing 140 may be provided with an upper frame support protrusion 144 to which the outer frame 152 of the upper elastic member 150 is coupled. The lower surface of the housing 140 may be provided with a lower frame support protrusion (not shown) to which the outer frame 162 of the lower elastic member 160 is coupled.

Additionally, a lower guide groove 148 into which the guide member 216 of the base 210 is inserted, fastened, or coupled may be provided at the lower portion of the second sides 141 and 142 of the housing 140. The lower guide groove 148 of the housing 140 and the guide member 216 of the base 210 may be coupled by the adhesive member 12 (see FIG. 11), and the housing 140 may be coupled to the base 210. It can be.

The lower ends (25, see FIG. 6) of the first sides 141 of the housing 140 coupled to the base 210 may contact the upper edge of the upper portion 210b of the base 210.

The housing 140 may be provided with an outer protrusion 40 on the outer surface 35 of each of the first side portions 141. The outer protrusion 40 of the housing 140 may extend from the bottom of the first sides 141 of the housing 140 toward the bottom of the base 210.

The outer protrusion 40 of the housing 140 may be arranged to correspond to the straight portion 170a (see FIG. 12) of the second coil 170 disposed on the base 210.

The outer protrusion 40 of the housing 140 may overlap the straight portion 170a of the coil 170 in a direction perpendicular to the optical axis OA.

For example, the outer protrusion 40 of the housing 140 may face the straight portion 170a of the second coil 170 disposed on the base 210 in the first horizontal direction 15a (see FIG. 12). .

The entire area of the straight portion 170a of the second coil 170 disposed on the base 210 may overlap the outer protrusion 40 of the housing 140 in the first horizontal direction 15a (see FIG. 12). .

For example, the length L1 of the outer protrusion 40 of the housing 140 in the second horizontal direction is longer than the straight portion 170a of the second coil 170 in the second horizontal direction 15b (see FIG. 12). It may be longer than or equal to the length.

The outer protrusion 40 of the housing 140 may be located outside the straight portion 170a of the second coil 170.

Additionally, the outer protrusion 40 of the housing 140 may overlap the side plates 302a to 302d of the cover member 300 in the optical axis direction.

Additionally, the outer protrusion 40 of the housing 140 in the optical axis direction may not overlap the magnet 130, but is not limited thereto. For example, the outer protrusion 40 of the housing 140 in the optical axis direction may at least partially overlap the magnet 130.

The lower end 25 of the first sides 141 of the housing 140 overlaps the second coil 170 disposed on the base 210 in the optical axis direction, but the outer protrusion 40 of the housing 140 is adjacent to the base 210. It does not overlap the straight portion 170a of the second coil 170 disposed at 210 in the optical axis direction.

The housing 140 and the cover member 300 are coupled between the outer protrusion 40 of the housing 140 and the side plates 302a to 302d of the cover member 300, and a gap is formed to prevent external foreign substances from entering. Adhesive members or sealing members 18a and 18b (see FIGS. 16A and 16B) may be disposed.

The outer protrusion 40 may protrude from the inner side of the first side 141 toward the outer side with respect to the outer side of the first side 141 of the housing 140, and may protrude from the lower end of the first side 141. It may protrude from the housing 140 in a direction toward the base 210 based on .

The outer protrusion 40 of the housing 140 protrudes from the inner surface of the first side 141 of the housing 140 toward the outer surface 35, and is connected to the inner surface of the outer protrusion 40 and the housing 140. Since there is a step between the inner surface of the first side 141, space for arranging the second coil 170 can be secured, and spatial interference between the cover member 300 and the second coil 170 can be prevented. This can be prevented, and the second coil 170 can be protected.

In the process of winding the second coil 170 to the base 210, a part of the second coil 170 may protrude out of the groove 201 of the base 210, and the outer protrusion ( If 40) is not provided, the portion of the second coil 170 protruding out of the groove 201 by the lower ends of the side plates 302a to 302d of the cover member 300 may be damaged, and the second coil 170 may be damaged. Electrical disconnection may occur at (170).

Additionally, if the housing 140 is not provided with the outer protrusion 40 and the lower end of the cover member extends to the lower part of the base 210, the gap between the cover member 300 and the housing 140 is large. As a result, the sealing member does not spread widely in the space between the cover member 300 and the housing 140, so a solid sealing effect cannot be obtained, and foreign substances may flow into the cover member from the outside.

The embodiment can prevent the second coil 170 from being damaged by the cover member 300 by providing an outer protrusion 40 provided on the outer surface of the side portions of the housing 140, and the second coil ( Electrical short circuit between 170) and the cover member 300 can be prevented.

In addition, in the embodiment, since the space between the outer protrusion 40 and the cover member 300 is filled by the adhesive member or sealing member (18a, 18b, see FIGS. 16a and 16b), the housing 140 and the cover member ( 300) The fixing force between the teeth can be strengthened and foreign substances can be prevented from flowing into the inside of the cover member.

The lower part (210a, see FIG. 8) of the base 210 located below the groove 201 is relative to the outer surface of the upper part (210b, see FIG. 8) of the base 210 located above the groove 201. It may include a region 211 protruding from the inner side of the base 210 toward the outer side. And the outer protrusion 40 of the housing 140 may overlap the protruding area 211 of the lower part 210a of the base 210 in the optical axis direction, and the lower end of the outer protrusion 40 is the base 210. It may be placed adjacent to the protruding area 211 of the lower part 210a.

The housing 140 and the cover member 300 are attached to the outer protrusion 40 of the housing 140, and an adhesive or sealing member is provided to prevent foreign substances from entering the cover member 300 from the outside. A depression 41 for injecting (see 18a, 18b, FIGS. 16a and 16b) may be provided.

The depression 41 may be positioned to contact a boundary surface where the outer protrusion 40 and the outer surface of the first side of the housing 140 meet. For example, the depression 41 may be disposed at the top or upper center of the outer protrusion 40 and may have an opening 40a that opens to the upper surface of the outer protrusion 40.

Additionally, an inner protrusion 42 may be provided on the inner surface of the outer protrusion 40 of the housing 140, corresponding to the depression 41, and protruding from the outer surface of the outer protrusion 40 toward the inner surface.

For example, the inner protrusion 42 may be formed in the same size or shape as the depression 41, and the height at which the inner protrusion 42 protrudes from the inner surface of the outer protrusion 40 is equal to the depression of the depression 41. It may be the same as the depth, but is not limited thereto.

When the depression 41 is provided in the outer protrusion 40 having a certain thickness, the thickness of the portion of the outer protrusion 40 where the depression 41 is provided is reduced, so the durability of the outer protrusion 40 may be reduced. . Accordingly, the embodiment can prevent the durability of the outer protrusion 40 from being reduced by providing the inner protrusion 42 at a position on the inner surface of the outer protrusion 40 corresponding to the depression 41.

FIG. 15 shows a cross-sectional view in the EF direction of the lens driving device 100 shown in FIG. 1, FIG. 16A shows a first side view of the lens driving device 100 shown in FIG. 1, and FIG. 16B shows a first side view of the lens driving device 100 shown in FIG. 1. A second side view of the lens driving device 100 is shown.

15, 16a, and 16b, the side plates 302a to 302d of the cover member 300 include connection terminals 164-1 to 164-4, second bonding portions 16a and 16b, and the outer protrusions 40 may be exposed.

For example, the side plates 302a to 302d of the cover member 300 expose the connection terminals 164-1 to 164-4, the second bonding portions 16a and 16b, and the outer protrusions 40. It may include a first area (S1) and a second area (S2) that is the remaining area excluding the first area (S1).

Additionally, the first region S1 includes a third region S3 exposing the outer protrusion 40, a fourth region S4 exposing the connection terminals 164-1 to 164-4, and second bonding portions. It may include a fifth region S5 exposing (16a, 16b).

The lower end of the first area (S1) of the cover member 300 may be located on the outer protrusion 40, and the lower end of the second area (S2) of the cover member 300 may be located on the lower end of the first area (S1). It can be expanded below. For example, the lower end of the second area S2 of the cover member 300 may extend to the lower portion 210a of the base 210.

For example, the bottom of the fourth area S4 may be located on the bottom of the third area S3, and the bottom of the fifth area S5 and the bottom of the third area S3 may be located at the same height. You can.

In order to facilitate the coupling of the side plates 302a to 302d of the cover member 300 and the outer protrusions 40 of the housing 140 and improve the coupling force, the side plates 302a of the cover member 300 to 302d), the lower end of the first region (S1) may face or be aligned with the upper end of the outer protrusion 40 in the optical axis direction, and the second region of the side plates (302a to 302d) of the cover member 300 ( The lower end of S2) may face or be aligned with the edge of the upper surface of the lower part 210a of the base 210 in the optical axis direction.

The lower end of the outer protrusion 40 and the upper edge of the lower portion 210a of the base 210 may be in contact with each other, but this is not limited to this, and in other embodiments, they may be spaced apart from each other.

The bottom of the second area S2 of the side plates 302a to 302d of the cover member 300 and the upper surface of the bottom portion 210a of the base 210 may be spaced apart from each other, but are not limited to this, and may be spaced apart from each other. In an embodiment, they may be in contact with each other.

For example, the outer surface of the lower portion 210a of the base 210, the outer surface of the outer protrusion 40 of the housing 140, and the third region S3 of the side plate of the cover member 300 are on the same plane. It may be located in, but is not limited to this.

There is a gap between the opening 40a of the depression 41 provided in the outer protrusion 40 of the housing 140 and the lower end of the first region S1 of the side plates 302a to 302d of the cover member 300. Space can exist. When the adhesive or sealing member is injected through the opening 40a of the recessed portion 41, the cover member adjacent to the lower end of the first region S1 of the side plates 302a to 302d of the cover member 300 ( As shown in FIGS. 16A and 16B, adhesive members or sealing members 18a and 18b may be disposed between the inner surface of the 300 and a corresponding area of the outer surface of the first sides of the housing 140.

Next, the magnet 130 will be described.

At the initial position of the bobbin 110, the magnet 130 may be placed on the side of the housing 140 to correspond to or align with the first coil 120. Here, the initial position of the bobbin 110 is the initial position of the AF movable part without power applied to the first coil 120, or the upper and lower elastic members 150 and 160 are elastically deformed only by the weight of the AF movable part. Depending on the location, the AF movable part may be placed. The AF movable unit may include the bobbin 110 and components mounted on the bobbin 110.

For example, the magnet 130 may be disposed in the groove 141a of the housing 140 to overlap the first coil 120 in the second or third direction.

In another embodiment, the groove 141a may not be formed in the first sides 141 of the housing 140, and the magnet 130 may be formed on the outer or inner surface of the first sides 141 of the housing 140. It may be placed on either side.

The shape of the magnet 130 may have a shape corresponding to each of the first sides 141 of the housing 140, for example, a rectangular parallelepiped shape, but is not limited thereto.

The magnet 130 may be a unipolar magnetized magnet or a bipolar magnetized magnet arranged so that the surface facing the first coil 120 is the S pole and the outer surface is the N pole. However, this is not limited, and it is also possible to configure it in the opposite way.

In the embodiment, the number of magnets 130 is 4, but the number is not limited thereto. The number of magnets 130 may be at least 2 or more, and the surface of the magnet 130 facing the first coil 120 is flat. It may be formed as a curved surface, but it is not limited thereto.

Next, the upper elastic member 150 and the lower elastic member 160 will be described.

Figure 7 shows a coupling diagram of the bobbin 110, the first coil 120, the upper elastic member 150, the lower elastic member 160, the base 210, and the second coil 170, and Figure 8 shows It shows an separated perspective view of the base 210 and the lower elastic member 160 to which the second coil 170 is coupled, and FIG. 9 shows the second coil 170, the base 210, and the lower elastic member shown in FIG. 8. 10 shows the arrangement of the second bonding portion 16a and the connection terminal 164-3 disposed on the base 210, and FIG. 11 shows the base 210 and the magnet 130. -1 to 130-4) shows a bottom perspective view of the lens driving device of FIG. 2 with omitted points, and FIG. 14 shows a cross-sectional view of the lens driving device shown in FIG. 2 in the AB direction.

7 to 11 and 14, the upper elastic member 150 and the lower elastic member 160 are coupled to the bobbin 110 and the housing 140 and elastically support the bobbin 110.

For example, the upper elastic member 150 may be coupled to the top (or top surface, or top) of the bobbin 110 and the top (or top surface, or top) of the housing 140.

The lower elastic member 160 may be coupled to the lower part (or lower surface, or lower end) of the bobbin 110 and the lower part (or lower surface, or lower end) of the housing 140.

In FIG. 7 , the upper elastic member 150 is not divided into a plurality of pieces, but the present invention is not limited thereto. In another embodiment, the upper elastic member 150 may include a plurality of elastic members spaced apart from each other.

The upper elastic member 150 includes a first inner frame 151 coupled to the upper part of the bobbin 110, a first outer frame 152 coupled to the upper part of the housing 140, and a first inner frame 151 and It may include a first connection portion 153 connecting the second outer frame 152.

The first inner frame 151 of the upper elastic member 150 may be provided with a through hole 151a coupled to the upper support protrusion 113 of the bobbin 110, and the first outer frame 152 may be provided with a housing 140. ) A through hole 152a coupled to the upper frame support protrusion 144 may be provided.

The lower elastic member 160 may include elastic members that are divided or separated into two or more pieces. For example, elastic members may be represented as springs.

For example, the lower elastic member 160 may include first to fourth elastic members 160-1 to 160-4 spaced apart from each other, and the first to fourth elastic members 160-1 to 160- 4) can be electrically separated from each other.

For example, the first coil 120 may be electrically connected to any two of the elastic members 160-1 to 160-2 of the lower elastic member 160, and the second coil 170 may be connected to the elastic members 160. It can be electrically connected to the remaining two of -1 to 160-2).

Each of the first to fourth elastic members 160-1 to 160-4 includes a second inner frame 161 coupled to the lower part of the bobbin 110, and a second outer frame coupled to the lower part of the housing 140. 162), and a second connection portion 163 connecting the second inner frame 161 and the second outer frame 162.

The second inner frame 161 of the lower elastic member 160 may be provided with a through hole 161a coupled to the lower support protrusion 117 of the bobbin 110, and the second outer frame 162 may be provided with a housing 140. ) may be provided with a through hole 162a coupled to the lower frame support protrusion.

For example, the first coil 120 may be bonded to the inner frames of any two of the elastic members 160-1 to 160-4.

For example, the second coil 170 may be bonded to the other two outer frames of the elastic members 160-1 to 160-4.

The upper elastic member 150 and the lower elastic member 160 may be implemented as leaf springs, but are not limited thereto, and may also be implemented as coil springs, suspension wires, etc.

Each of the first and second connecting portions 153 and 163 may be bent or curved at least once to form a pattern of a certain shape. The bobbin 110 may be elastically (or elastically) supported in an upward and/or downward motion in the first direction through a change in position and slight deformation of the first and second connecting portions 153 and 163.

In order to prevent oscillation when the bobbin 110 moves, a damper may be disposed between the first connection portion 153 of the upper elastic member 150 and the upper surface of the bobbin 110. Alternatively, a damper (not shown) may be disposed between the second connection portion 163 of the lower elastic member 160 and the lower surface of the bobbin 110.

Alternatively, a damper may be applied to a joint portion of each of the bobbin 110 and the housing 140 and the upper elastic member 150, or a joint portion of each of the bobbin 110 and the housing 140 and the lower elastic member 160. . For example, the damper may be gel-type silicone.

For example, the first to fourth elastic members 160-1 to 160-4 may be separated or spaced apart from each other at the first sides 141 of the housing 140.

First bonding portions 15a and 15b for bonding both ends of the first coil 120 to ends of the second inner frames 161 of the first and second elastic members 160-1 and 160-2. ) can be provided.

The reason for providing the first bonding parts 15a and 15b in the second inner frame is that the second inner frame 161 is closer to the bobbin 110 than the second outer frame 163, so that the first coil 120 This is to make bonding with the device easier.

The second outer frames 163 of the third and fourth elastic members 160-3 and 160-4 are provided with second bonding portions 16a and 16b for bonding both ends of the second coil 170. It can be.

The reason why the second bonding portions 16a and 16b are provided on the second outer frame 163 is because the second outer frame 163 is closer to the outer surface of the base 210 than the second inner frame 161. , This is to make bonding with the second coil 170 easier.

One end of the second coil 170 may be bonded to the second bonding portion 16a of the third elastic member 160-3 by an adhesive member such as solder 20 (see FIG. 10), and the second coil ( 170) The other end may be bonded to the second bonding portion 16b of the fourth elastic member 160-4.

The first coil 120 is connected to the first bonding parts 15a and 15b provided on the second inner frame 161 of the lower elastic member 160, and the second coil 170 is connected to the lower elastic member 160. By connecting to the second bonding portions 16a and 16b provided on the second outer frame 163, the embodiment can reduce the distance between two points for bonding, thereby making bonding easier.

The first bonding portions 15a and 15b of the lower elastic member 160 are attached to ends of second inner frames of elastic members (e.g., 160-1 and 160-2) facing each other in two or third directions. It may be provided, but it is not limited to this.

The second bonding portions 16a and 16b are connected to the outer surfaces of the second outer frames 163 of the third and fourth elastic members 160-3 and 160-4, and the second outer frames 163 It may be bent and extended in a direction toward the base 210.

For example, the second bonding portion 16a may be bent in a direction from the second outer frame 163 of the third elastic member 160-3 toward the base 210, and the second bonding portion 16b may be bent in a direction toward the base 210. 4 The second outer frame 163 of the elastic member 160-4 may be bent in the direction of the base 210.

The reason that the second bonding parts 16a and 16b are bent and extended from the second outer frame 163 in the direction toward the base 210 is because they are connected to the second coil 170 disposed on the outer surface of the base 210. This is to facilitate bonding between the second bonding parts 16a and 16b and the second coil 170 by reducing the separation distance.

With respect to the above-described first and second bonding parts 15a, 15b, 16a, and 16b, “bonding part” may be replaced with the term pad part, connection terminal part, solder part, or electrode part.

Each of the first to fourth elastic members 160-1 to 160-4 is connected to the outer surface of the second outer frame 162 and is bent in a direction from the second outer frame 163 toward the base 210. It may include connection terminals 164-1 to 164-4 extending from the terminal.

Each of the connection terminals 164-1 to 164-4 of the first to fourth elastic members 160-1 to 160-4 is bent in a direction from the second outer frame 162 toward the base 210. and can be placed spaced apart from each other.

Each of the connection terminals 164-1 to 164-4 of the first to fourth elastic members 160-1 to 160-4 corresponds to one of the first depressions 205a to 205d provided in the base 210. It can be placed, seated, or inserted into any one.

For example, the first connection terminals 164-1 and 164-2 of the first and second elastic members 160-1 and 160-2 are disposed on the first outer surface of the base 210, and the first It can be in contact with the outer surface.

The second connection terminals 164-3 and 164-4 of the third and fourth elastic members 160-3 and 160-4 are disposed on the second outer surface of the base 210 and are connected to the second outer surface of the base 210. can be accessed. For example, the first outer surface and the second outer surface of the base 210 may face each other or be located on opposite sides.

Additionally, the second bonding portion 16a of the third elastic member 160-3 is disposed on the third outer surface of the base 210 and may be in contact with the third outer surface. The second bonding portion 16b of the fourth elastic member 160-4 may be disposed on the fourth outer surface of the base 210, and the third outer surface and fourth outer surface of the base 210 face each other. They can be visible or located opposite each other.

The connection terminals 164-1 to 164-4 of the first to fourth elastic members 160-1 to 160-4 may be exposed from the base 210, and the connection terminals 164-1 to 164 -4) can be electrically separated from each other.

For example, the inner surface of each of the connection terminals 164-1 to 164-4 disposed in the first depressions 205a to 205d is one surface (e.g., the bottom surface) of the corresponding first depressions 205a to 205d. can be accessed.

The outer surface of each of the connection terminals 164-1 to 164-4 disposed in the first depressions 205a to 205d may be exposed from the outer surface of the base 210, and the connection terminals 164-1 to 164-4 164-4) The lower end of each may be exposed from the lower surface of the base 210.

The lower ends of the second bonding portions 16a and 16b may be located above the groove 201 of the base 210, and the lower ends of each of the connection terminals 164-1 to 164-4 may be positioned above the groove 201 of the base 210. (201) can be extended below. For example, the length in the optical axis direction of each of the connection terminals 164-1 to 164-4 based on the outer frame 151 of the upper elastic member 150 is the optical axis direction of each of the second bonding portions 16a and 16b. It can be longer than the length of .

The depth of the first depressions 205a to 205d may be greater than the thickness of the connection terminals 164-1 to 164-4, and the connection terminals 164-1 disposed in the first depressions 205a to 205d to 164-4) The outer surface of each does not protrude out of the first depressions 205a to 205d.

The connection terminals 164-1 to 164-4 may be electrically connected to external wires or external elements by a conductive member, such as soldering, in order to supply power or signals from the outside.

If the solder bonded to the connection terminals 164-1 to 164-4 protrudes out of the outer surface of the base 210, the solder bonded to the connection terminals 164-1 to 16-4 Contact or collision with the cover 300 may occur, which may result in an electrical short circuit or disconnection. The embodiment secures a sufficient depth of the first depressions 205a to 205d so that the solder bonded to the connection terminals 164-1 to 164-4 does not protrude out of the outer surface of the base 210. The above-mentioned electrical short circuit or disconnection can be prevented.

If the first and second coils 120 and 170 are directly bonded to the connection terminals 164-1 to 164-4 by the first solder, the connection terminals 164- When soldering is performed on 1 to 164-4), the first solder may melt and the electrical connection between the first and second coils 120 and 170 may be broken.

In the embodiment, the first and second bonding parts 15a, 15b, 16a, 16b where the first and second coils are bonded, and connection terminals 164-1 to 164-4 which are electrically connected to the outside are separate. Since it is provided on the lower elastic member 160, it is possible to prevent the electrical connection between the first and second coils 120 and 170 from being broken when soldering the connection terminals.

With respect to the above-mentioned connection terminals (164-1 to 164-4), the term “connection terminal” may be replaced with the term pad part, bonding part, solder part, or electrode part.

The first coil 120 is connected to the first and second connection terminals 164-1 and 164-2 of the first and second elastic members 160-1 and 160-2 on which the first bonding portions 15a and 15b are provided. ) A driving signal for driving may be provided, and the third and fourth connection terminals of the third and fourth elastic members 160-3 and 160-4 are provided with second bonding portions 16a and 16b. The induced voltage of the second coil 170 may be output to the outside through (164-3, 164-4).

The base 210 is coupled to the housing 140 and, together with the cover member 300, may form an accommodating space for the bobbin 110 and the housing 140. The base 210 may have a hollow corresponding to the hollow of the bobbin 110 and/or the hollow of the housing 140, and may have a shape that matches or corresponds to the cover member 300, for example, a square shape. .

The base 210 may include a guide member 216 (see FIG. 8) that protrudes upward at a predetermined height from each of the four corner portions. The guide member 216 may have a polygonal pillar shape protruding from the upper surface of the base 210 so as to be perpendicular to the upper surface of the base 210, but is not limited thereto.

The guide member 216 may be inserted, fastened, or coupled to the lower guide groove 148 of the housing 140 by an adhesive member 12 (see FIG. 11) such as epoxy or silicon.

The second coil 170 may be disposed below the lower elastic member 160 and may be disposed to be wound around the outer surface of the base 210 in a clockwise or counterclockwise direction with respect to the optical axis.

For example, a groove 201 may be provided on the outer surface of the base 210.

For example, the groove 201 of the base 210 may have a structure recessed from the outer surface of the base 210. The groove 201 may be spaced apart from each of the upper and lower surfaces of the base 210. This can prevent the second coil 170 disposed or wound within the groove 201 of the base 201 from being separated from the base 210.

The length of the second coil 170 wound around the groove 201 of the base 210 in the direction of the optical axis may be smaller than the length in the direction perpendicular to the optical axis from the inner peripheral surface of the base 210 to the outer peripheral surface. As a result, the height or length of the lens driving device 100 in the optical axis direction can be reduced.

Base 210 has first sides 218a corresponding to or aligned with first sides 141 of housing 140 and second sides corresponding to or aligned with second sides 142 of housing 140. may include fields 218b. The first sides 218a of the base 210 may have a flat outer surface, and the second sides 218b of the base 210 may have a curved outer surface.

Each of the second sides 218b of the base 210 connects two adjacent second sides to each other and may be located at a corner or corner of the base. For example, the second side portion 218b may be expressed as a corner portion.

The groove 201 of the base 210 may be recessed from the outer surfaces of the first and second sides 218a and 218b and may have a ring shape.

On the outer surface of at least one of the first sides 218a of the base 210, first to fourth connection terminals 164-1 to 164-1 of the first to fourth elastic members 160-1 to 160-4 are provided. It may include first depressions 205a to 205d corresponding to 164-4)).

Additionally, a second recessed portion 13a in which the second bonding portions 16a and 16b are disposed may be provided on at least another outer surface of the first side portions 218a of the base 210.

For example, the first depressions 205a to 205d of the base 210 may be provided on the outer surfaces of the first sides of the base 210 to be spaced apart from each other, and the second depressions 13a may be provided on the outer surfaces of the first sides of the base 210 facing each other. 1 The depressions 205a to 205d may be provided on outer surfaces of first sides of the base 210 that are not provided, but are not limited thereto.

For example, first depressions 205a may be formed on the outer surfaces of the two first sides of the base 210 that do not face each other, depending on where the first to fourth connection terminals 164-1 to 164-4 are disposed. to 205d) may be provided.

For example, each of the first depressions 205a to 205d and the second depression 13a may include an upper opening open to the upper surface of the base 210 and a lower opening open to the lower surface of the base 210. You can.

The distance of the depressed one surface of the first depressions 205a to 205d with respect to the outer surface of the base 210, and the distance of the depressed one surface of the second depression 13a with respect to the side of the base 210 are grooves It may be smaller than the distance of the sunken surface of (201). For example, based on the outer surface of the base 210, the recessed depth of the first recessed portions 205a to 205d and the recessed depth of the second recessed portion 13a may be smaller than the recessed depth of the groove 201. there is.

As a result, the first to fourth connection terminals 164-1 to 164-4 of the lower elastic member 160 disposed in the first depressions 205a to 205d of the base 210 are in the groove of the base 210. It may be spaced apart from the second coil 170 disposed in (201), so that the first to fourth connection terminals 164-1 to 164-4 and the second coil 170 do not spatially interfere with each other. It may not be possible.

The second coil 170 and the connection electrodes 164-1 to 164-4 are all disposed on the outer surfaces of the sides 218a and 218b of the base 210, and the connection electrodes 164-1 to 164- 4) extends below the groove 201 where the second coil 170 is disposed, so that the second coil 170 and the connection electrodes 164-1 to 164-4 are aligned in the optical axis direction and in a direction perpendicular to the optical axis. If they are arranged to overlap, spatial interference may occur between the two.

In this case, by increasing the depth of the groove 201 in which the second coil 170 is disposed, spatial interference between the second coil 170 and the connection electrodes 164-1 to 164-4 can be avoided or avoided. However, the injection process of the base 210 to deepen the groove 201 is not easy, and when forming the groove 201 deep, the second coil 170 wound on the groove 201 is not easy. As the length is reduced, the preset resistance value of the second coil 170 cannot be secured.

The induced voltage of the second coil 170 changes due to changes in ambient temperature, and this change in induced voltage may cause malfunction of AF driving. Temperature compensation is required for accurate AF operation. To facilitate temperature compensation, the resistance of the second coil 170 is required to be greater than or equal to a preset resistance value (eg, 30Ω).

FIG. 12 is a plan view showing the relative arrangement relationship between the connection electrodes 164-1 to 164-4 and the second coil 170, and FIG. 13 is a cross-sectional view cut in the CD direction of the lens driving device 100 of FIG. 1. represents.

Referring to FIGS. 12 and 13 , the second coil 170 disposed on the outer surface of the base 210 may have a ring shape including straight portions and curved portions. In the second coil 170, the straight part is expressed as a “straight part”, and the curved part is expressed as a “curved part”.

For example, the first portion 170a of the second coil 170 disposed in the groove 210 provided on the first side 218a of the base 210 may have a straight shape, and the second side 210 of the base 210 may have a straight shape. The second portion 170b of the second coil 171 disposed in the groove 210 provided at 218a may have a curved shape. For example, the first part 170a of the second coil 170 may be a straight part, and the second part 170b may be a curved part.

For example, the depth of the groove 201 located on the first side 218a of the base 210 may be constant and may be smaller than the depth of the groove 210 located on the second side 218a.

The straight portion of the second coil 170 is connected to two connection terminals (e.g., 164-1 and 164-2, 164-3 and 164) disposed on the outer surface of one of the first side portions 218a of the base 210. -4) It can be located between.

Each of the first to fourth connection terminals 164-1 to 164-4 may be arranged to overlap the second portion 170b of the second coil 170 in the first horizontal direction 15a.

For example, the first horizontal direction 15a may be a direction perpendicular to the outer surface of the first side 218a of the base 210 where the connection terminals 164-1 to 164-4 are disposed.

In addition, the connection terminals 164-1, 164-2, 164-3, and 164-4 disposed on the outer surface of one of the first sides 218a of the base 210 are connected to any one of the base 210. It may be arranged to overlap the first portion 170a of the second coil 170 disposed on the first side 218a in the second horizontal direction 15b.

For example, the second horizontal direction 15b may be perpendicular to the optical axis OA and parallel to the outer surface of one of the first side portions 218a of the base 210.

For example, the first portion 170a of the second coil 210 disposed on one of the bases 210 is connected to two disposed on the outer surface of the first side 218a of the base 210. It may be disposed between terminals (eg, 164-1 and 164-2, and 164-3 and 164-4).

The connection terminals 164-1, 164-2, 164-3, and 164-4 disposed on the outer surface of one of the first sides 218a of the base 210 are connected to the second side in the first horizontal direction 15a. Since it is arranged to overlap the second part 170b of the coil 170, the connection terminals 164-1 and 164-2 are arranged on the outer surface of any first side 218a of the base 210, Even though 164-3 and 164-4) and the first portion 170a of the second coil 170 overlap in the second horizontal direction 15b, the connection terminals 164-1, 164-2, and 164-3 164-4) and the second coil 170 can be arranged without spatially interfering with each other.

Therefore, in the embodiment, the depth of the groove 201 provided on the outer surface of the base 210 can be reduced to avoid space between the connection terminals and the second coil, and the second coil 170 disposed in the groove 210 ) can increase the resistance value, and mold manufacturing and injection performance for forming the base 210 can be easily secured.

In addition, the second bonding portions 16a and 16b of the third and fourth elastic members 160-3 and 160-4 are connected to the second portion 170b of the second coil 170 in the first horizontal direction 15a. may overlap, and may overlap with the first portion 170a of the second coil 160 in the second horizontal direction, but is not limited thereto.

Referring to FIGS. 9 and 12 , the first separation distance D1 may be smaller than the second separation distance D2 (D1<D2).

The first separation distance D1 is between the reference line 501 that passes through the center 401 of the base 210 and is parallel to the optical axis OA and the second coil 170 disposed in the groove 201 of the base 210. It could be the distance. For example, the first separation distance D1 may be the distance between the center 401 of the base 210 and the second portion 170b of the second coil 170.

The second separation distance D2 may be the distance between the reference line 501 and the connection terminals 164-1 to 164-4 disposed in the first depressions 205a to 205d.

In order to prevent electrical contact, the connection terminals 164-1 to 164-4 of the lower elastic member 160 disposed in the first depressions 205a to 205d and the second coil disposed in the groove 201 ( 170) can be spaced apart from each other.

A portion of the lower end of the side plate of the cover member 300 and the protruding area 211 of the lower portion 210a of the base 210 may face each other in the optical axis direction. For example, a portion of the lower end of the side plate of the cover member 300 in the direction of the optical axis OA may overlap the protruding area 211 of the lower portion 210a of the base 210. At this time, the protruding area 211 of the lower part 210a of the base 210 and the lower end of the side plate of the cover member 300 may be spaced apart from each other, but the present invention is not limited to this.

8 and 10, the third and fourth elastic members 160-3 and 160-4 each have one second bonding portion 16a and 16b and one connection terminal 164-3 and 164. -4) may be included.

The second bonding portions 16a and 16b of the third and fourth elastic members 160-3 and 160-4 and the connection terminals 164-3 and 164-4 are located on different outer surfaces of the base 210. can be placed in

For example, the second bonding portion 16a of the third elastic member 160-3 and the connection terminal 164-3 each have two adjacent second sides (or corner portions) of the base 210. It may be disposed on a corresponding one of the outer surfaces of the first sides.

Also, for example, the second bonding portion 16a of the fourth elastic member 160-4 and the connection terminal 164-3 each have two first sides adjacent to any other second side of the base 210. It may be placed on any one of the corresponding outer surfaces.

The reason for arranging the second bonding portions 16a and 16b and the connection terminals 164-3 and 164-4 on the outer surfaces of different first sides of the base 210 is because the connection terminals 164-3 and 164- 4), the heat generated during the soldering process for electrical connection is suppressed from being transferred to the solder bonded to the second bonding portions 16a and 16b, thereby forming the second bonding portions 16a and 16b and the second coil ( 170) This is to prevent the electrical connection from being broken.

For electrical connection to the outside, the connection terminals 164-1 to 164-4 are connected to the second coil 170 or the base 210 from the second outer frame 162 of the elastic members 160-1 to 160-4. ) may extend below the groove 201.

On the other hand, in order to facilitate the electrical connection of the second coil 170, the second bonding parts 16a and 16b are located in an area of the outer portion of the base 210 located above the groove 201 of the base 210. can be placed.

Referring to FIG. 11, the first width W1 of the first region 162-1 of the second outer frame 162 of each of the third and fourth elastic members 160-3 and 160-4 is 2 It may be larger than the second width W2 of the second area 162-2 of the outer frame 162 and the third width W3 of the third area 162-3 (W1>W2, W1> W3).

The second area 162-2 is an area to which the connection terminal 162-2 is connected, the third area 162-3 is an area to which the second bonding portion 16b is connected, and the first area 162- 1) may be an area connecting the second area 162-2 and the third area 162-3.

By increasing the area of the first area 162-1, the area for dissipating heat generated during soldering to the connection terminal 164-4 can be expanded, and as a result, when soldering to the connection terminal 164-4 By suppressing the transfer of heat generated to the second bonding part 16b, the electrical connection between the second bonding part 16b and the second coil 170 can be prevented from being broken.

In addition, in order to support the housing 140 and the bobbin 110 in a balanced manner, the inner frame, outer frame, and connection portion of the first to fourth elastic members 160-1 to 160-4 have the same shape or , it can have a shape that is symmetrical to the origin with the optical axis as the origin.

For balanced support, for example, the fourth width of the fourth region of the second outer frame 162 of each of the first and second elastic members 160-1 and 160-2 is the second outer frame 162. may be larger than the fifth width of the fifth area and the sixth width of the sixth area (W1>W2, W1>W3).

The fourth area of each of the first and second elastic members 160-1 and 160-2 may be an area corresponding to the first area 162-1 of the third and fourth elastic members, and the fifth area may be an area corresponding to the second area 162-2, and the sixth area may be an area corresponding to the third area 162-3.

Referring to FIG. 8 , the outer surface of each of the first sides 218a of the base 210 may include a third recessed portion 17a corresponding to the inner protrusion 42 of the housing 140.

For example, on each of the outer surfaces of the first sides 218a of the base 210, there are two first depressions 205a and 205b spaced apart from each other, and a first depression located between the first depressions 205a and 205b. 3 A depression 17a may be provided.

Each of the third depressions 17a may be located between two first depressions provided on a corresponding one of the outer surfaces of the base 210.

For example, in order to easily place or seat the inner protrusion 42 of the housing 140, each of the third depressions 17a has an upper opening open to the upper surface of the base 210 and an opening to the groove 201. It may include a lower opening.

Figure 17 shows mutual inductance according to the separation distance between the first coil and the second coil.

In Figure 17, in a structure in which the first coil, which is the AF driving coil, is disposed above the second coil, which is the sensing coil, the mutual inductance between the first coil and the second coil as the first coil mounted on the bobbin moves in the upward direction is shown. represents change.

Referring to FIG. 17, when the separation distance between the first coil and the second coil is less than 100㎛, the linearity of the change in mutual inductance between the first coil and the second coil according to the displacement of the bobbin rapidly deteriorates. The induced voltage generated in the second coil is proportional to the mutual inductance between the first coil and the second coil, so when the separation distance between the first coil and the second coil is less than 100㎛, the induction of the second coil according to the displacement of the bobbin The linearity of voltage changes rapidly deteriorates.

Therefore, in a structure in which the first coil, which is the AF driving coil, is disposed above the second coil, which is the sensing coil, in order to ensure the linearity of the induced voltage of the second coil, the separation distance between the first coil and the second coil at the highest point of the bobbin is Since it must be designed to be at least 100㎛, there are restrictions on the design of the first coil and second coil arrangement, and the overall thickness of the lens driving device may increase.

On the other hand, in the embodiment, since the second coil 170 is disposed on the base 210 located below the first coil 120, when the bobbin 110 moves from the upper side, the first coil 120 and the first coil 120 The two coils 170 move away from each other. Therefore, the separation distance between the first coil 120 and the second coil 170 at the initial position of the bobbin 110 in the case of unidirectional drive, or the lowest point of the bobbin 110 in the case of bidirectional drive, is set to only about 100㎛. Then, even if the bobbin 110 moves upward, the linearity of the induced voltage of the second coil is automatically maintained, so restrictions on the arrangement design of the driving coil and sensing coil 170 can be relaxed, and the thickness of the lens driving device can be reduced. It can be reduced.

In addition, when placing the second coil 170 on the upper surface of the base 210, the thickness of the base 210 must be sufficiently considered to prevent interference with the lower elastic member, but in the embodiment, the second coil 170 Since it is placed on the side of the base 210, the thickness of the base 210 can be reduced.

Additionally, because the second coil 170 is arranged to be wound around the side of the base 210, the length of one rotation of the second coil can be increased. Therefore, compared to the case of the second coil disposed on the upper surface of the base 210, the magnitude of the induced voltage of the second coil 170 can be increased when the number of rotations is the same.

In addition, the rotation speed of the second coil 170 wound around the base 210 may be greater than the rotation speed of the first coil 120 wound around the bobbin 110, but is not limited thereto. In another embodiment, the base 210 ) may be less than or equal to the number of rotations of the second coil 170 wound around the bobbin 110.

In general, AF (Auto Focus) feedback control requires a position sensor that can detect the displacement of the AF moving part, and a separate power connection structure to drive the position sensor, which increases the price of the lens drive device and makes manufacturing difficult. This can happen.

Additionally, the linear section (hereinafter referred to as “first linear section”) of the graph between the moving distance of the bobbin and the magnetic flux of the magnet detected by the position sensor may be restricted by the positional relationship between the magnet and the position sensor.

Since the embodiment does not require a separate position sensor to detect the displacement of the bobbin 110, the cost of the lens driving device can be reduced and the ease of manufacturing work can be improved.

In addition, since mutual induction between the first coil 120 and the second coil 170 is used, the linear section of the graph between the moving distance of the bobbin 110 and the induced voltage due to mutual induction is compared to the above-described first linear section. can be increased. As a result, the embodiment can secure linearity in a wide range, improve the process defect rate, and perform more accurate AF feedback control.

Figure 18 shows a cross-sectional view of a lens driving device 100-1 according to another embodiment.

The lens driving device 100-1 shown in FIG. 18 may further include a magnetic member 172 disposed on the second coil 171 to increase the magnitude of the induced voltage generated in the second coil 171. You can. The magnetic member 171 and the second coil 171 may have a ring shape and may have the same diameter. In FIG. 12, the width of the magnetic member 171 and the width of the second coil 172 may be the same, but are not limited thereto. In another embodiment, the width of the magnetic member 171 is equal to that of the second coil 172. It can be wider than the width.

The magnetic member 171 and the second coil 172 may be disposed in the groove 201. The lower surface of the magnetic member 171 may be in contact with the upper surface of the second coil 172.

In another embodiment, the magnetic member 172 may be disposed below the second coil 171.

The magnetic member 171 may be an iron core or a ferrite core having magnetism. For example, the ferrite core may be MnZn or NiZn. MnZn-based ferrite cores can be used for low frequencies, and NiZn-based ferrite cores can be used for high frequencies.

Figure 19 shows a cross-sectional view of a lens driving device 100-2 according to another embodiment.

Referring to FIG. 19 , the magnetic member 171 may be disposed outside the second coil 171. The inner surface of the magnetic member 171 may be in contact with the outer surface of the second coil. In another embodiment, the second coil may be located outside the magnetic member, and the outer surface of the magnetic member may contact the inner surface of the second coil.

Figure 20 shows an exploded perspective view of the camera module 200 according to an embodiment.

Referring to Figure 20, the camera module includes a lens or lens barrel 400, a lens driving device 100, an adhesive member 612, a filter 610, a first holder 600, a second holder 800, and an image It may include a sensor 810, a motion sensor 820, a control unit 830, and a connector 840.

A lens or lens barrel (lens barrel, 400) may be mounted on the bobbin 110 of the lens driving device 100.

The first holder 600 may be placed below the base 210 of the lens driving device 100. The filter 610 is mounted on the first holder 600, and the first holder 600 may have a protrusion 500 on which the filter 610 is seated.

The adhesive member 612 may couple or attach the base 210 of the lens driving device 100 to the first holder 600. In addition to the adhesive role described above, the adhesive member 612 may also serve to prevent foreign substances from entering the lens driving device 100.

For example, the adhesive member 612 may be epoxy, thermosetting adhesive, ultraviolet curing adhesive, etc.

The filter 610 may serve to block light of a specific frequency band from light passing through the lens barrel 400 from entering the image sensor 810. The filter 610 may be an infrared blocking filter, but is not limited thereto. At this time, the filter 610 may be arranged parallel to the x-y plane.

A hollow may be formed in a portion of the first holder 600 where the filter 610 is mounted so that light passing through the filter 610 can enter the image sensor 810.

The second holder 800 is disposed below the first holder 600, and the image sensor 810 may be mounted on the second holder 600. The image sensor 810 is a site where light passing through the filter 610 is incident and an image included in the light is formed.

The second holder 800 may be equipped with various circuits, elements, and control units to convert the image formed on the image sensor 810 into an electrical signal and transmit it to an external device.

The second holder 800 can be implemented as a circuit board on which an image sensor can be mounted, a circuit pattern can be formed, and various elements can be combined.

The image sensor 810 may receive an image included in light incident through the lens driving device 100 and convert the received image into an electrical signal.

The filter 610 and the image sensor 810 may be arranged to be spaced apart from each other in the first direction.

The motion sensor 820 is mounted on the second holder 800 and can be electrically connected to the control unit 830 through a circuit pattern provided on the second holder 800.

The motion sensor 820 outputs rotational angular velocity information resulting from the movement of the camera module 200. The motion sensor 820 may be implemented as a 2-axis or 3-axis gyro sensor, or an angular velocity sensor.

The control unit 830 is mounted on the second holder 800 and may be electrically connected to the second position sensor 240 and the second coil 230 of the lens driving device 100. For example, the second holder 800 may be electrically connected to the circuit board 250 of the lens driving device 100, and the control unit 830 mounted on the second holder 800 may be connected to the circuit board 250 through the circuit board 250. 2 It may be electrically connected to the position sensor 240 and the second coil 230.

The control unit 830 generates a driving signal capable of performing hand shake correction for the OIS movable unit of the lens driving device 100 based on feedback signals provided from the second position sensor 240 of the lens driving device 100. Can be printed.

The connector 840 is electrically connected to the second holder 800 and may have a port for electrical connection to an external device.

In addition, the lens driving device 100 according to the embodiment forms an image of an object in space by using the characteristics of light, such as reflection, refraction, absorption, interference, and diffraction, and aims to increase the visual power of the eye or uses a lens. It may be included in an optical instrument for the purpose of recording and reproducing images, or for optical measurement, propagation or transmission of images, etc. For example, an optical device according to an embodiment may include a smartphone and a portable terminal equipped with a camera.

FIG. 21 shows a perspective view of a portable terminal 200A according to an embodiment, and FIG. 22 shows a configuration diagram of the portable terminal shown in FIG. 21.

21 and 22, the portable terminal (200A, hereinafter referred to as “terminal”) includes a body 850, a wireless communication unit 710, an A/V input unit 720, a sensing unit 740, and an input/output unit 720. It may include an output unit 750, a memory unit 760, an interface unit 770, a control unit 780, and a power supply unit 790.

The body 850 shown in FIG. 21 has a bar shape, but is not limited to this, and may be a slide type, folder type, or swing type in which two or more sub-bodies are coupled to enable relative movement. It may have various structures such as , swirl type, etc.

The body 850 may include a case (casing, housing, cover, etc.) that forms the exterior. For example, the body 850 may be divided into a front case 851 and a rear case 852. Various electronic components of the terminal may be built into the space formed between the front case 851 and the rear case 852.

The wireless communication unit 710 may be configured to include one or more modules that enable wireless communication between the terminal 200A and a wireless communication system or between the terminal 200A and the network where the terminal 200A is located. For example, the wireless communication unit 710 may be configured to include a broadcast reception module 711, a mobile communication module 712, a wireless Internet module 713, a short-range communication module 714, and a location information module 715. there is.

The A/V (Audio/Video) input unit 720 is for inputting audio or video signals and may include a camera 721 and a microphone 722.

The camera 721 may include the camera module 200 according to the embodiment shown in FIG. 20.

The sensing unit 740 monitors the current state of the terminal 200A, such as the open/closed state of the terminal 200A, the location of the terminal 200A, presence or absence of user contact, the direction of the terminal 200A, acceleration/deceleration of the terminal 200A, etc. It is possible to detect and generate a sensing signal to control the operation of the terminal 200A. For example, if the terminal 200A is in the form of a slide phone, it can sense whether the slide phone is opened or closed. In addition, it is responsible for sensing functions related to whether the power supply unit 790 supplies power and whether the interface unit 770 is connected to an external device.

The input/output unit 750 is for generating input or output related to vision, hearing, or tactile sensation. The input/output unit 750 can generate input data for controlling the operation of the terminal 200A and can also display information processed by the terminal 200A.

The input/output unit 750 may include a key pad unit 730, a display module 751, a sound output module 752, and a touch screen panel 753. The key pad unit 730 can generate input data through key pad input.

The display module 751 may include a plurality of pixels whose colors change according to electrical signals. For example, the display module 751 may be a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, or a three-dimensional display. It may include at least one display (3D display).

The audio output module 752 outputs audio data received from the wireless communication unit 710 in call signal reception, call mode, recording mode, voice recognition mode, or broadcast reception mode, or stored in the memory unit 760. Audio data can be output.

The touch screen panel 753 can convert the change in capacitance that occurs due to the user's touch to a specific area of the touch screen into an electrical input signal.

The memory unit 760 may store programs for processing and controlling the control unit 780 and stores input/output data (e.g., phone book, messages, audio, still images, photos, videos, etc.). It can be stored temporarily. For example, the memory unit 760 may store images captured by the camera 721, such as photos or videos.

The interface unit 770 serves as a passage connecting external devices connected to the terminal 200A. The interface unit 770 receives data from an external device, receives power and transmits it to each component inside the terminal 200A, or transmits data inside the terminal 200A to an external device. For example, the interface unit 770 includes a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device equipped with an identification module, and audio I/O (Input/ Output) port, video I/O (Input/Output) port, and earphone port.

The controller 780 can control the overall operation of the terminal 200A. For example, the control unit 780 may perform related control and processing for voice calls, data communications, video calls, etc.

The control unit 780 may be equipped with a multimedia module 781 for multimedia playback. The multimedia module 781 may be implemented within the control unit 180 or may be implemented separately from the control unit 780.

The control unit 780 can perform pattern recognition processing to recognize handwriting or drawing input on the touch screen as text and images, respectively.

The power supply unit 790 can receive external power or internal power under the control of the control unit 780 and supply power necessary for the operation of each component.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

110: bobbin 120: first coil
130: Magnet 140: Housing
150: upper elastic member 160: lower elastic member
170: second coil 210: base
300: Absence of cover.

Claims (20)

housing;
a bobbin disposed inside the housing;
a first coil disposed on the outer peripheral surface of the bobbin;
a magnet disposed in the housing in correspondence with the first coil;
a base disposed below the housing;
a second coil disposed on the base and generating an induced voltage by interaction with the first coil; and
It includes a lower elastic member coupled to the lower part of the bobbin and the lower part of the housing,
The lower elastic member includes first to fourth elastic members,
One end of the first coil is coupled to the first elastic member, the other end of the first coil is coupled to the second elastic member, and one end of the second coil is coupled to the third elastic member and the second The other end of the coil is coupled to the fourth elastic member,
A lens driving device in which a driving signal is supplied to the first coil through the first and second elastic members, and an induced voltage of the second coil is output through the third and fourth elastic members. According to paragraph 1,
Each of the first to fourth elastic members includes an outer frame coupled to the lower portion of the housing,
The lower elastic member includes a first connection terminal connected to the outer frame of the first elastic member, a second connection terminal connected to the outer frame of the second elastic member, and a second connection terminal connected to the outer frame of the third elastic member. a third connection terminal, and a fourth connection terminal connected to the outer frame of the fourth elastic member,
The first to fourth connection terminals are disposed on an outer surface of the base. According to paragraph 2,
The third elastic member includes a first bonding portion coupled to one end of the second coil, and the fourth elastic member includes a second bonding portion coupled to the other end of the second coil, and the first and second elastic members A lens driving device where bonding portions are disposed on the outer surface of the base. According to paragraph 3,
A lens driving device in which a groove in which the second coil is disposed is formed on the outer surface of the base. According to paragraph 2,
The first to fourth connection terminals are disposed outside the second coil,
The first to fourth connection terminals overlap the second coil in a direction perpendicular to the optical axis. According to paragraph 3,
Two first depressions spaced apart from each other are formed on the outer surface of the base, the first connection terminal is disposed in one of the first depressions, and the second connection terminal is one of the first depressions. The lens drive device is placed on the other one. According to clause 6,
Two second recessed portions spaced apart from each other are formed on the outer surface of the base, the first bonding portion of the third elastic member is disposed in one of the second recessed portions, and the first bonding portion of the third elastic member is disposed in one of the second recessed portions. A lens driving device where the second bonding part is disposed in the other one of the second recessed parts. According to clause 6,
Each of the first depressions includes an upper opening that opens to the upper surface of the base, and a lower opening that opens to the lower surface of the base. According to paragraph 3,
The outer surface of the base includes a first outer surface and a second outer surface located on opposite sides of each other, and a third outer surface and a fourth outer surface located on opposite sides,
The first and second connection terminals are spaced apart from each other on the first outer surface of the base, and the third and fourth connection terminals are spaced apart from each other on the second outer surface of the base. . According to clause 9,
The first bonding portion of the third elastic member is disposed on the third outer surface of the base, and the second bonding portion of the fourth elastic member is disposed on the fourth outer surface of the base. According to paragraph 1,
The lower elastic member includes an inner frame coupled to the lower portion of the bobbin and a frame connection portion connecting the inner frame and the outer frame. According to paragraph 2,
A driving signal for supplying the first coil is applied to the first and second connection terminals, and the induced voltage of the second coil is output through the third and fourth connection terminals. According to paragraph 1,
The second coil is a lens driving device having a ring shape including a straight portion and a curved portion. According to paragraph 1,
The second coil is a lens driving device disposed below the lower elastic member. According to paragraph 1,
The first coil is electrically connected to the first and second elastic members,
The second coil is electrically connected to the third and fourth elastic members. According to paragraph 3,
It includes a top plate and a side plate, and a cover member for accommodating the housing,
The side plate of the cover member exposes the first to fourth connection terminals and the first and second bonding portions. According to paragraph 1,
A lens driving device including an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing. According to paragraph 3,
The one end of the first coil is coupled to the inner frame of the first elastic member by solder, and the other end of the first coil is coupled to the inner frame of the second elastic member by solder,
The first bonding part of the third elastic member is coupled to the one end of the second coil by solder, and the second bonding part of the fourth elastic member is coupled to the other end of the second coil by solder. drive. lens;
A lens driving device according to any one of claims 1 to 18; and
A camera module containing an image sensor. An optical device comprising the camera module according to claim 19.

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