JP2022041730A - Lens drive device and camera module - Google Patents

Abstract

To provide a lens drive device with which further downsizing can be realized.SOLUTION: A lens drive device 101 comprises a stationary-side member RG, a lens holding member 2, and a drive mechanism MK for moving the lens holding member 2 to the stationary-side member RG. The stationary-side member RG includes an upper cover member 4U made of metal and having a first outer circumferential part 4A and a ceiling part 4B, a base member 18 facing the ceiling part 4B across the lens holding member 2, and a lower cover member 4L made of metal and having a bottom plate part 4D facing the base member 18 and a lower end 4AE of the first outer circumferential part 4A and a second outer circumferential part 4C arranged on the outside of the first outer circumferential part 4A. The upper cover member 4U and the lower cover member 4L are electrically connected, and a terminal part 7DT, as a grounding terminal electrically continuous to the upper cover member 4U, protrudes downward of the bottom plate part 4D from a position inward of the second outer circumferential part 4C.SELECTED DRAWING: Figure 15

Description

The present disclosure relates to a lens driving device mounted on, for example, a portable device with a camera.

Conventionally, a camera module is known in which a section formed on a shield case is bent inward and a conductive material provided on the outside of the section is used to electrically connect the shield case and the ground pad. (See Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-199829

However, in the above-mentioned camera module, the conductive material may protrude to the outside of the shield case. Therefore, it is necessary to set the size of the substrate portion to a large size so that the outflow of the conductive material that protrudes can be prevented. As a result, the camera module becomes large.

Therefore, it is desired to provide a lens driving device capable of further miniaturization.

The lens driving device according to an embodiment of the present invention includes a fixed-side member including a housing, a lens holding member arranged in the housing and capable of holding a lens body, and the fixed-side member for holding the lens. In a lens driving device provided with a driving mechanism for moving the lens with respect to a lens, the fixed-side member sandwiches the lens holding member with a first metal cover member having a first outer peripheral wall portion and a top plate portion. A base member facing the top plate portion of the first cover member, a bottom plate portion facing the lower end portion of the base member and the first outer peripheral wall portion, and a first arranged outside the first outer peripheral wall portion. A second cover member made of metal having two outer peripheral wall portions is provided, and the first cover member and the second cover member are electrically connected to each other and are electrically connected to the first cover member for grounding. The terminal protrudes downward from the bottom plate portion from a position inside the second outer peripheral wall portion.

The above-mentioned lens driving device can realize further miniaturization.

It is a perspective view of the lens drive device. It is an exploded perspective view of a lens drive device. It is the upper perspective view and the front view of the lens drive device. It is a top view and a bottom view of a lens drive device. It is the upper perspective view and the front view of the lens driving device in the state which the spacer and the cover member are removed. It is an upper perspective view of the lens holding member. It is a lower perspective view of a lens holding member. It is a top view of the lens holding member. It is a side view of a lens holding member. It is an enlarged view of a part of a lens holding member. It is a bottom view of the lens drive device in a state where some members are removed. It is the top view of the upper leaf spring and the bottom view of the lower leaf spring. It is a figure explaining the connection structure of a leaf spring and a coil in a lens drive device. It is a figure which shows the structural example of a base member. It is a lower perspective view of a lens driving device. It is a detailed view of the bottom of a lens drive device. It is a perspective view of another example of a lens driving device. It is an enlarged view of the bottom of another example of a lens drive device. It is a perspective view of still another example of a lens driving device. It is an enlarged view of the bottom of still another example of a lens drive device.

Hereinafter, the lens driving device 101 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the lens driving device 101. Specifically, FIG. 1A is an upward perspective view of the lens driving device 101, and FIG. 1B is a downward perspective view of the lens driving device 101.

As shown in FIGS. 1 and 2, the lens driving device 101 includes a cover member 4 which is a part of the fixed side member RG. The cover member 4 includes an upper cover member 4U and a lower cover member 4L. In FIG. 1, a dot pattern is attached to the lower cover member 4L for clarification.

The cover member 4 is configured to function as a housing HS that covers each member. In the present embodiment, the cover member 4 is manufactured by subjecting a plate material made of a soft magnetic material such as iron to punching, drawing, and the like, and functions as a yoke. However, the cover member 4 may be manufactured by subjecting a plate material made of a non-magnetic metal such as austenitic stainless steel to a punching process, a drawing process, or the like. As shown in FIG. 1, the cover member 4 has a box-shaped outer shape that defines the storage portion 4s.

The upper cover member 4U is a rectangular annular and flat top plate portion 4B provided so as to be continuous with the rectangular tubular first outer peripheral wall portion 4A and the upper end (Z1 side end) of the first outer peripheral wall portion 4A. And have. A substantially circular opening 4k is formed in the center of the top plate portion 4B. The first outer peripheral wall portion 4A includes a first side plate portion 4A1 to a fourth side plate portion 4A4. The first side plate portion 4A1 and the third side plate portion 4A3 face each other, and the second side plate portion 4A2 and the fourth side plate portion 4A4 face each other. The first side plate portion 4A1 and the third side plate portion 4A3 extend perpendicularly to the second side plate portion 4A2 and the fourth side plate portion 4A4. The top plate portion 4B is not limited to a flat plate shape, and may have a concave portion or a convex portion.

Similarly, the lower cover member 4L has a rectangular annular shape and a flat plate shape provided so as to be continuous with the rectangular tubular second outer peripheral wall portion 4C and the lower end (Z2 side end) of the second outer peripheral wall portion 4C. It has a bottom plate portion 4D. A circular opening 4 m is formed in the center of the bottom plate portion 4D. The second outer peripheral wall portion 4C includes a first side plate portion 4C1 to a fourth side plate portion 4C4. The first side plate portion 4C1 and the third side plate portion 4C3 face each other, and the second side plate portion 4C2 and the fourth side plate portion 4C4 face each other. The first side plate portion 4C1 and the third side plate portion 4C3 extend perpendicularly to the second side plate portion 4C2 and the fourth side plate portion 4C4. In the second outer peripheral wall portion 4C shown in FIG. 1, the first side plate portion 4C1 to the fourth side plate portion 4C4 are configured to be continuous, but for example, the four corner portions of the second outer peripheral wall portion 4C. A slit may be provided in each of the above so as not to be continuous.

As shown in FIG. 1, the upper cover member 4U is joined to the lower cover member 4L with an adhesive.

Next, with reference to FIGS. 2 to 5, each member housed in the cover member 4 as the housing HS will be described. FIG. 2 is an exploded perspective view of the lens driving device 101. FIG. 3A is an upward perspective view of the lens driving device 101 with the lower cover member 4L removed, and FIG. 3B is a lens driving device with the lower cover member 4L removed. It is a front view of 101. FIG. 4A is a top view of the lens driving device 101 with the lower cover member 4L removed, and FIG. 4B is a lens driving device 101 with the lower cover member 4L removed. It is a bottom view of. FIG. 5A is an upward perspective view of the lens driving device 101 in a state where the spacer 1 and the cover member 4 are removed, and corresponds to FIG. 3A. FIG. 5B is a front view of the lens driving device 101 in a state where the spacer 1 and the cover member 4 are removed, and corresponds to FIG. 3B. In FIG. 5, a dot pattern is attached to the coil 3 for clarification.

Note that X1 represents one direction of the X-axis constituting the three-dimensional Cartesian coordinate system, and X2 represents the other direction of the X-axis. Further, Y1 represents one direction of the Y axis constituting the three-dimensional Cartesian coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional Cartesian coordinate system, and Z2 represents the other direction of the Z axis. In this embodiment, the optical axis JD extends parallel to the Z axis. The Y1 side of the lens driving device 101 corresponds to the rear side (rear side) of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101. Further, the X1 side of the lens driving device 101 corresponds to the right side of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the left side of the lens driving device 101. The same applies to other figures.

As shown in FIG. 2, the lens driving device 101 includes a lens holding member 2 capable of holding a lens body (not shown) and a driving mechanism MK capable of moving the lens holding member 2 along the optical axis direction. A leaf spring 6 that movably supports the lens holding member 2 in the optical axis direction, a fixed side member RG to which the leaf spring 6 is fixed, and a metal member 7 that provides an electrical connection to the outside are included. The lens body is, for example, a tubular lens barrel including at least one lens. The optical axis direction includes the direction of the optical axis JD with respect to the lens body and the direction parallel to the optical axis JD.

As shown in FIG. 2, the drive mechanism MK includes a coil 3 wound in an octagonal ring shape, a cover member 4 having a rectangular tubular first outer peripheral wall portion 4A and also serving as an outer case, and a magnet 5. The magnet 5 includes a first magnet 5A and a second magnet 5B arranged to face the two sides of the coil 3.

The fixed-side member RG includes a spacer 1, a cover member 4, and a base member 18 in which a metal member 7 is embedded.

The leaf spring 6 is an upper leaf spring 16 arranged between the lens holding member 2 and the cover member 4 (strictly speaking, a spacer 1), and a lower plate arranged between the lens holding member 2 and the base member 18. Includes spring 26. The lower leaf spring 26 includes a first lower leaf spring 26A and a second lower leaf spring 26B.

As shown in FIG. 1, the lens driving device 101 has a substantially rectangular parallelepiped outer shape, and is mounted on an external substrate (not shown) on which an image pickup device (not shown) is mounted. The external substrate, the lens driving device 101, the lens body mounted on the lens holding member 2, and the image pickup element mounted on the external substrate so as to face the lens body constitute a camera module. The coil 3 is connected to the power supply via the lower leaf spring 26, the metal member 7, and the external substrate. When a current flows through the coil 3, the drive mechanism MK generates an electromagnetic force along the optical axis direction.

The lens driving device 101 realizes an automatic focus adjustment function by using this electromagnetic force to move the lens holding member 2 along the optical axis direction on the Z1 side (subject side) of the image pickup element. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image sensor to enable macro photography, and moves the lens holding member 2 in a direction closer to the image sensor to enable infinity photography. I have to.

Next, the lens holding member 2 and the drive mechanism MK will be described. FIG. 6A is an upward perspective view of the lens holding member 2, and FIG. 6B is a lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 6A. It is an upper perspective view. 7 (A) is a downward perspective view of the lens holding member 2, and FIG. 7 (B) is a lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 7 (A). It is a lower perspective view. 8 (A) is a top view of the lens holding member 2, and FIG. 8 (B) is an upper surface of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 8 (A). It is a figure. 9 (A) is a right side view of the lens holding member 2 as seen from the X1 side, and FIG. 9 (B) shows a state in which the coil 3 is wound around the lens holding member 2 shown in FIG. 9 (A). It is a right side view of the lens holding member 2 shown. 9 (C) is a left side view of the lens holding member 2 as seen from the X2 side, and FIG. 9 (D) shows a state in which the coil 3 is wound around the lens holding member 2 shown in FIG. 9 (C). It is a left side view of the lens holding member 2 shown. 10 (A) is an enlarged view of a portion in the range R1 shown in FIG. 7 (B), and FIG. 10 (B) is a view of the portion in the range R2 shown in FIG. 7 (B) from the X2 side. It is an enlarged view of the time. FIG. 11A is a bottom view of the lens driving device 101 in a state where the lower cover member 4L, the metal member 7, and the base member 18 are removed, and FIG. 11B is a further first lower leaf spring. It is a bottom view of the lens driving device 101 in the state where the 26A, the second lower leaf spring 26B, and the lens holding member 2 are removed. In FIGS. 6 to 11, a dot pattern is attached to the coil 3 for clarification.

In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Specifically, as shown in FIG. 6A, the lens holding member 2 has a tubular portion 12 formed so as to extend along the optical axis direction and an image pickup element side (Z2 side) in the optical axis direction. Includes a flange portion (flange-shaped portion) 52 formed in. In the present embodiment, the upper half of the tubular portion 12 is formed in a substantially cylindrical shape.

A thread groove is formed on the inner peripheral surface of the tubular portion 12 so that the lens body is screwed into the tubular portion 12. Further, the cylindrical portion 12 is provided with pedestal portions 12d having recesses 12dh at four locations on the end surface on the subject side. Then, as shown in FIG. 5A, the inner portion 16i of the upper leaf spring 16 is placed on the pedestal portion 12d.

As shown in FIG. 6A, a coil support portion 12j as an outer wall portion that supports the coil 3 from the inside is provided on the outer peripheral surface of the tubular portion 12. In the present embodiment, the coil support portion 12j has an octagonal outer shape in the top view so as to support the octagonal annular coil 3 in the top view. On the subject side of the coil support portion 12j, eaves portions 12h projecting outward in the radial direction so as to face the flange portion 52 in the optical axis direction are formed at four locations. Then, as shown in FIG. 6B, the coil 3 is supported by the coil support portion 12j and is sandwiched between the eaves portion 12h and the flange portion 52 in the optical axis direction so that the outer periphery of the lens holding member 2 is formed. It is mounted on the surface in an octagonal ring.

The flange portion 52 projects radially outward from the end portion of the tubular portion 12 on the image sensor side (Z2 side). A coil 3 is arranged on the subject side of the flange portion 52. As shown in FIG. 7B, the flange portion 52 is formed with two notched portions 52k with the optical axis JD interposed therebetween. An extending portion 33, which is a part of the conductive wire rod constituting the coil 3, is passed through the cutout portion 52k. Specifically, an extending portion 33A, which is a part of the wire rod on the winding end side of the coil 3, is passed through one of the notch portions 52k, and one of the wire rods on the winding start side of the coil 3 is passed through the other of the cutout portion 52k. The extension portion 33B, which is a portion, is passed through. The edge portion of the flange portion 52 forming the notch portion 52k is configured to be rounded (not angular). This is to prevent disconnection of the wire rod constituting the coil 3 in contact with the edge portion.

As shown in FIG. 7A, the flange portion 52 has four round convex projecting portions 2t protruding downward (Z2 direction) from the surface on the image sensor side (Z2 side), and the flange portion 52 also downward (Z2). Includes two square convex protrusions 72 that project in the direction).

As shown in FIG. 7B, the protrusion 72 includes a protrusion 72A corresponding to the winding end side of the coil 3 (winding portion 13) and a protrusion 72B corresponding to the winding start side of the coil 3. .. That is, both ends of the wire rod constituting the coil 3 are wound and held around the two protrusions 72.

As shown in FIGS. 7 (A) and 11 (A), the projecting portion 2t corresponds to two through holes 26r (see FIG. 12 (B)) formed in the first lower leaf spring 26A. It includes one projecting portion 2t and two projecting portions 2t corresponding to the two through holes 26r (see FIG. 12B) formed in the second lower leaf spring 26B. Then, the inner portion 26i as the first support portion (movable side support portion) of each of the first lower leaf spring 26A and the second lower leaf spring 26B is mounted and fixed to the projecting portion 2t. The fixing of the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B is realized by heating the projecting portion 2t inserted into the through hole 26r formed in the inner portion 26i. .. In FIGS. 7 (A) and 7 (B), the projecting portion 2t is shown in a state where the tip is deformed after being heated. The same applies to the other drawings illustrating the projecting portion 2t.

Next, the drive mechanism MK of the lens drive device 101 will be described. As shown in FIG. 11B, the drive mechanism MK includes a coil 3, a cover member 4, and a magnet 5. The magnet 5 includes a first magnet 5A and a second magnet 5B arranged to face two of the four sides of the cover member 4. Then, the drive mechanism MK generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and moves the lens holding member 2 up and down along the optical axis direction.

As shown in FIG. 7B, the coil 3 is formed by winding a conductive (metal) wire (conductor) around the outer periphery of the lens holding member 2. Specifically, the coil 3 includes a winding portion 13 as a coil main body portion formed by being wound in an octagonal ring shape, and an extending portion 33 extending from the winding portion 13 and wound around a protruding portion 72. In FIG. 7B, for the sake of clarity, the detailed winding state of the conductive wire rod whose surface is covered with the insulating member is omitted for the winding portion 13. That is, the winding portion 13 is shown in a simplified manner. The same applies to the other drawings illustrating the winding portion 13.

The extending portion 33 includes an extending portion 33A connected to an end portion (winding end portion) of the winding portion 13 located on the outer peripheral side of the winding portion 13 on the winding end side of the coil 3 and a winding start of the coil 3. The extension portion 33B connected to the end portion (winding start portion) of the winding portion 13 located on the inner peripheral side of the winding portion 13 on the side is included.

Specifically, as shown in FIG. 10B, the extending portion 33B faces the winding portion 33m wound around the protruding portion 72B and the bottom surface (the surface on the Z2 side) of the lens holding member 2 so as to face each other. A portion 33c and an insertion portion 33k that is inserted through the cutout portion 52k and extends from the image pickup element side (Z2 side) of the flange portion 52 to the subject side (Z1 side) are included.

In the present embodiment, the extending portion 33B has a protruding portion 72B of the lens holding member 2 before the wire rod constituting the coil 3 is wound around the coil supporting portion 12j (see FIG. 6A) of the lens holding member 2. Wrapped around. In the example shown in FIG. 10B, a part of the wire rod constituting the coil 3 is wound around the protrusion 72B for 3 turns. As a result, the winding portion 33m is formed on the protruding portion 72B, and a part of the extending portion 33B is held by the protruding portion 72B. However, the extending portion 33B may be wound around the protruding portion 72B after the wire rod constituting the coil 3 is wound around the coil supporting portion 12j of the lens holding member 2.

Typically, after a portion of the extending portion 33B is wound around the protruding portion 72B, the rest of the wire rod constituting the coil 3 is wound around the coil supporting portion 12j of the lens holding member 2. At that time, as shown in FIG. 10B, a part of the extending portion 33B extending from the winding portion 33m extends from the lower side of the flange portion 52 to the upper side of the flange portion 52 through the notch portion 52k. At this time, the portion facing the bottom surface of the lens holding member 2 constitutes the facing portion 33c of the extending portion 33B, and the portion passing through the cutout portion 52k constitutes the insertion portion 33k of the extending portion 33B.

As shown in FIG. 6B, the winding portion 13 of the coil 3 wound around the coil supporting portion 12j of the lens holding member 2 is arranged at a position surrounding the periphery of the lens holding member 2. Further, the winding portion 13 is fixed to the subject side of the flange portion 52 so as to be sandwiched between the eaves portion 12h and the flange portion 52 in a state of being supported from the inside by the coil support portion 12j. Further, since the inner peripheral surface of the winding portion 13 is isotropically and well-balancedly supported by the coil supporting portion 12j, the central axis of the coil 3 and the central axis of the lens holding member 2 coincide with each other in the winding portion 13. In this state, it is held by the lens holding member 2. Therefore, the optical axis JD of the lens body held by the lens holding member 2 is configured to easily coincide with the central axes of the lens holding member 2 and the coil 3.

When the winding of the wire rod around the outer circumference of the lens holding member 2 is completed, the extending portion 33A connected to the end portion of the winding portion 13 on the winding end side is the subject side of the flange portion 52 as shown in FIG. 10 (A). It is pulled out from the flange portion 52 to the image pickup element side via the notch portion 52k. Specifically, the insertion portion 33k passes through the notch portion 52k, the facing portion 33c extends so as to face the bottom surface of the lens holding member 2, and the winding portion 33m is wound around the protruding portion 72A of the lens holding member 2. In the example shown in FIG. 10A, the extending portion 33A is wound around the protruding portion 72A for three turns.

Next, the cover member 4 constituting the drive mechanism MK will be described. In the present embodiment, the cover member 4 is manufactured by subjecting a plate material made of a soft magnetic material such as iron to punching, drawing, and the like, and functions as a yoke. Specifically, as shown in FIG. 1, the cover member 4 is composed of an upper cover member 4U and a lower cover member 4L, and has a box-shaped outer shape that defines a storage portion 4s. Then, as described above, the upper cover member 4U is provided in a flat plate shape and is provided so as to be continuous with the rectangular tubular first outer peripheral wall portion 4A and the upper end (Z1 side end) of the first outer peripheral wall portion 4A. It has a rectangular annular top plate portion 4B. Further, the lower cover member 4L is a flat plate-shaped and rectangular annular bottom plate provided so as to be continuous with the rectangular tubular second outer peripheral wall portion 4C and the lower end (Z2 side end) of the second outer peripheral wall portion 4C. It has a part 4D. As shown in FIG. 11B, the cover member 4 configured in this way accommodates the coil 3 and the magnet 5 in the accommodating portion 4s. Then, the upper cover member 4U is coupled to the base member 18 as shown in FIG.

Next, the magnet 5 constituting the drive mechanism MK will be described. The magnet 5 has a substantially rectangular parallelepiped shape as shown in FIG. Then, as shown in FIG. 11B, the magnet 5 is located outside the coil 3 and has four side surfaces (side plate portions) of the rectangular tubular first outer peripheral wall portion 4A constituting the upper cover member 4U. They are arranged along two of them facing each other. Specifically, as shown in FIGS. 11A and 11B, the first magnet 5A is arranged along the second side plate portion 4A2 facing the protrusion 72A, and the second magnet 5B is arranged. , Arranged along the fourth side plate portion 4A4 facing the protruding portion 72B. Each of the first magnet 5A and the second magnet 5B is fixed to the upper cover member 4U by an adhesive, and is arranged so that, for example, the inside (the side close to the optical axis JD) is the north pole and the outside is the south pole. Has been done. However, each of the first magnet 5A and the second magnet 5B may be arranged so that the inner side is the S pole and the outer side is the N pole.

Next, the leaf spring 6 and the fixed side member RG will be described with reference to FIGS. 12 to 14. FIG. 12 is a diagram showing a configuration example of the leaf spring 6. Specifically, FIG. 12A is a top view of the upper leaf spring 16, and FIG. 12B is a bottom view of the lower leaf spring 26. FIG. 13 is a diagram illustrating an example of a connection structure between the second lower leaf spring 26B and the coil 3. Specifically, FIG. 13 (A) is an enlarged view of the range R3 shown in FIG. 11 (A), and FIG. 13 (B) shows a portion in the range R3 shown in FIG. 11 (A) from the X2 side. It is an enlarged view of the 2nd lower leaf spring 26B, the coil 3, and the lens holding member 2 when seen. In addition, in FIG. 13A and FIG. 13B, the conductive adhesive CA as a bonding material is shown in a cross pattern for the sake of easy understanding. Further, in FIGS. 13A and 13B, a coarse dot pattern is attached to the lens holding member 2 and a fine dot pattern is attached to the coil 3 for clarification. FIG. 14 is a diagram showing a configuration example of the base member 18 as the fixed side member RG. Specifically, FIG. 14 (A) is an upward perspective view of the base member 18 in a state where the metal member 7 embedded in the base member 18 is removed, and FIG. 14 (B) is a view of the metal member 7 of the metal member 7. 14 (C) is an upward perspective view of the base member 18 including the metal member 7, and FIG. 14 (D) is a view in which the first lower leaf spring 26A and the second lower leaf spring 26B are attached. It is an upper perspective view of the base member 18 in the state which was put in the state. In FIG. 14C, a dot pattern is attached to the metal member 7 for clarification. Further, in FIG. 14D, a dot pattern is attached to the lower leaf spring 26 for clarification.

The leaf spring 6 is made of a metal plate whose main material is a copper alloy. As shown in FIG. 2, the leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the cover member 4 (strictly speaking, the spacer 1), and the lens holding member 2 and the base member 18. It includes a lower leaf spring 26 arranged between them. In the state where the lens holding member 2 and the leaf spring 6 (upper leaf spring 16, first lower leaf spring 26A, and second lower leaf spring 26B) are combined, the lens holding member 2 of the leaf spring 6 is in the optical axis direction. The lens holding member 2 is supported so as to be movable in the (Z-axis direction). The lower leaf spring 26 also functions as a feeding member for supplying an electric current to the coil 3. Therefore, the first lower leaf spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3. A spacer 1 is arranged between the upper leaf spring 16 and the cover member 4. The spacer 1 is arranged so as to prevent the lens holding member 2 and the cover member 4 from colliding with each other when the lens holding member 2 moves in the Z1 direction. That is, the spacer 1 is arranged so as to form a space between the lens holding member 2 and the top plate portion 4B of the cover member 4. However, the spacer 1 may be omitted as long as a space can be formed between the lens holding member 2 and the top plate portion 4B of the cover member 4 by another structure or the like.

As shown in FIG. 12A, the upper leaf spring 16 has a substantially rectangular annular outer shape. The upper leaf spring 16 has an inner portion 16i as a first support portion (movable side support portion) fixed to the movable side member (lens holding member 2) and a second support portion fixed to the fixed side member RG. It includes two outer portions 16e as (fixed side supports) and four elastic arm portions 16g located between the inner portion 16i and the two outer portions 16e. Specifically, each of the two outer portions 16e has two corner portions 16b and a crosspiece 16r connecting the two corner portions 16b. The crosspiece 16r is sandwiched between the spacer 1 and the magnet 5 and fixed with an adhesive. The spacer 1, the cover member 4, and the magnet 5 function as the fixed-side member RG.

When the upper leaf spring 16 is incorporated in the lens driving device 101, as shown in FIG. 5A, the inner portion 16i is attached to the pedestal portion 12d of the lens holding member 2 (see FIG. 6A). It will be placed. Then, the inner portion 16i is fixed to the lens holding member 2 by the adhesive AD (see FIG. 5A) applied to the recess 12dh formed in the pedestal portion 12d. As shown in FIG. 5B, the outer portion 16e is in contact with the upper surface (the surface on the Z1 side) of the magnet 5 and is sandwiched between the spacer 1 (not shown in FIG. 5B) and the magnet 5. And fixed. The outer portion 16e sandwiched and fixed between the spacer 1 and the magnet 5 functions as a fixed-side member RG.

As shown in FIG. 12A, the upper leaf spring 16 is formed so as to be rotationally symmetric with respect to the optical axis JD. The upper leaf spring 16 is fixed to the lens holding member 2 at the inner portion 16i, and is fixed to the cover member 4 via the spacer 1 at the outer portion 16e. Therefore, the upper leaf spring 16 can support the lens holding member 2 in a well-balanced manner.

As shown in FIG. 12B, the first lower leaf spring 26A and the second lower leaf spring 26B are configured so that their inner shapes are substantially semicircular. Then, each of the first lower leaf spring 26A and the second lower leaf spring 26B is fixed to the inner portion 26i as the first support portion (movable side support portion) fixed to the movable side member (lens holding member 2). An outer portion 26e as a second support portion (fixed side support portion) fixed to the side member RG (base member 18) and two elastic arm portions 26g located between the inner portion 26i and the outer portion 26e. include.

As shown in FIG. 12B, the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B are two inner joint portions 26c joined to the projecting portion 2t of the lens holding member 2. A connecting portion 26p connecting between the two inner joining portions 26c and a connecting plate portion 26h facing the extending portion 33 of the coil 3 are included.

When the first lower leaf spring 26A and the second lower leaf spring 26B are incorporated into the lens driving device 101, each of the four projecting portions 2t of the lens holding member 2 shown in FIG. 7A is shown in FIG. It is inserted into a circular through hole 26r provided in the inner joint portion 26c of each of the first lower leaf spring 26A and the second lower leaf spring 26B shown in (B). Then, the inner joint portion 26c is fixed to the lens holding member 2 as shown in FIG. 11A by, for example, heat caulking or cold caulking the protruding portion 2t. As a result, the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B are positioned and fixed to the lens holding member 2.

The outer portion 26e of the first lower leaf spring 26A includes an outer joint portion 26d joined to the base member 18, as shown in FIG. 12B. The through hole 26s provided in the outer joint portion 26d of the first lower leaf spring 26A receives the projecting portion 18t (see FIG. 14A) provided on the upper surface of the base member 18. Then, the projecting portion 18t is subjected to hot caulking or cold caulking and fixed to the outer joint portion 26d. As a result, the outer portion 26e of the first lower leaf spring 26A is positioned and fixed to the base member 18 as shown in FIG. 14 (D). The same applies to the second lower leaf spring 26B.

As described above, the first lower leaf spring 26A is connected to the lens holding member 2 via the two inner joint portions 26c, and is connected to the base member 18 via the two outer joint portions 26d. The same applies to the second lower leaf spring 26B. With this configuration, the first lower leaf spring 26A and the second lower leaf spring 26B can support the lens holding member 2 in a state of being movable in the optical axis direction in a well-balanced manner.

Next, with reference to FIG. 13, an example of the connection structure between the second lower leaf spring 26B and the coil 3 will be described. The description of the second lower leaf spring 26B is similarly applied to the first lower leaf spring 26A.

As shown in FIGS. 13A and 13B, the connecting plate portion 26h of the inner portion 26i of the second lower leaf spring 26B is a jetty of the lens holding member 2 when the lens driving device 101 is assembled. It is configured to face the portion 82 (see FIG. 10B). That is, as shown in FIG. 13A, the surface of the connecting plate portion 26h on the subject side (Z1 side) faces the concave accommodating portion 82s surrounded by the jetty portion 82. Then, as shown in FIG. 13A, the facing portion 33c of the extending portion 33B of the coil 3 is the surface of the inner portion 26i (connecting plate portion 26h) of the second lower leaf spring 26B on the subject side and the lens holding member. It extends through between the surface of the image sensor side (Z2 side) of 2. The jetty portion 82 is composed of a stepped portion formed on the bottom surface of the lens holding member 2. The surface of the lens holding member 2 on the image sensor side (Z2 side) constitutes the bottom surface of the accommodating portion 82s.

The accommodating portion 82s is configured to accommodate the conductive adhesive CA that connects the extending portion 33B of the coil 3 and the second lower leaf spring 26B. In the present embodiment, since the jetty portion 82 is formed at a position adjacent to the protrusion 72B, the side wall of the protrusion 72B is suitably used as a part of the jetty portion 82. Therefore, the accommodating portion 82s is provided at a position adjacent to the protruding portion 72B.

When the second lower leaf spring 26B is assembled to the lens holding member 2, the protruding portion 72B has a tip (end on the Z2 side) of the second lower leaf spring 26B as shown in FIG. 13 (B). It protrudes downward (Z2 direction) from the inner portion 26i so as to be located on the image sensor side (Z2 side) of the inner portion 26i. Further, a part of the winding portion 33m is also wound around the protruding portion 72B so as to be located on the image pickup element side (Z2 side) of the inner portion 26i.

The second lower leaf spring 26B and the extending portion 33B of the coil 3 are electrically and physically connected by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before incorporating the second lower leaf spring 26B into the lens holding member 2, the conductive adhesive CA is applied to the accommodating portion 82s surrounded by the jetty portion 82 of the lens holding member 2, and then the second. The lower leaf spring 26B is attached to the lens holding member 2. Then, the projecting portion 2t of the lens holding member 2 is heated and the conductive adhesive CA is thermally cured. From the application of the conductive adhesive CA to the accommodating portion 82s to the thermosetting of the conductive adhesive CA, the lens holding member 2 is typically arranged upside down so that the protruding portion 72B protrudes vertically upward. It is done in the state. Therefore, the conductive adhesive CA can be appropriately held at a desired position (position within the accommodating portion 82s) even when it has fluidity. Since a part of the facing portion 33c is arranged in the accommodating portion 82s, it is embedded in the conductive adhesive CA. The conductive adhesive CA is not limited to the thermosetting type, but may be an ultraviolet curable type or a moisture curable type.

Next, the fixed side member RG will be described. The fixed-side member RG includes a spacer 1, a cover member 4, and a magnet 5 for fixing the upper leaf spring 16, and a base member 18 for fixing each of the first lower leaf spring 26A and the second lower leaf spring 26B.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, as shown in FIG. 14A, the base member 18 is a member having a rectangular plate-like outer shape, and a circular opening 18k is formed in the center. Further, on the surface (upper surface) of the base member 18 on the subject side (Z1 side), six round convex projecting portions 18t protruding upward are provided. The projecting portion 18t is inserted into a through hole 26s (see FIG. 12B) provided in the outer joint portion 26d of each of the first lower leaf spring 26A and the second lower leaf spring 26B. At this time, the projecting portion 18t is heat-caulked and fixed to the outer joint portion 26d. In FIG. 14, the projecting portion 18t is shown in a state where the tip is deformed after being heat-caulked. The same applies to the other drawings illustrating the projecting portion 18t. The projecting portion 18t may be cold-crimped and fixed to the outer joint portion 26d.

As shown in FIG. 14B, a metal member 7 formed of a metal plate containing a material such as copper or iron or an alloy containing them as a main component is insert-molded and embedded in the base member 18. .. The metal member 7 includes a first metal member 7A to a fourth metal member 7D. As shown in FIG. 14C, each of the first metal member 7A to the fourth metal member 7D is partially exposed on the upper surface (Z1 side surface) of the base member 18. Each of the first metal member 7A and the second metal member 7B, which are electrically insulated from each other, has a terminal portion 7AT extending downward (Z2 direction) from an end portion on the front side (Y2 side) of the base member 18 and a terminal portion 7AT. It is electrically and mechanically connected to an external substrate (not shown) on which the image sensor is mounted via the terminal portion 7BT. Further, as shown in FIGS. 14C and 14D, the first metal member 7A is electrically and electrically attached to the first lower leaf spring 26A by a joining material such as solder or by welding in the exposed portion 7AP. The second metal member 7B is mechanically connected, and the second metal member 7B is electrically and mechanically connected to the second lower leaf spring 26B in the exposed portion 7BP by a joining material such as solder or by welding. Further, the first lower leaf spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3. Therefore, the coil 3 can receive an electric current via the first metal member 7A and the second metal member 7B and the first lower leaf spring 26A and the second lower leaf spring 26B.

The third metal member 7C includes two connecting portions 7CP, and the fourth metal member 7D includes two connecting portions 7DP. As shown in FIG. 14C, the third metal member 7C exposes two connecting portions 7CP on the upper surface of the base member 18 so as to correspond to two of the lower ends of the four corners of the upper cover member 4U. ing. Similarly, as shown in FIG. 14C, the fourth metal member 7D has two connecting portions 7DP as a base member 18 so as to correspond to the remaining two of the lower ends of the four corners of the upper cover member 4U. It is exposed on the upper surface of.

The inner surface of the upper cover member 4U near the lower end of the first outer peripheral wall portion 4A is combined with and positioned on the outer peripheral side surface of the base member 18 as shown in FIG. 3A. After that, the base member 18 is fixed to the upper cover member 4U by welding each of the connecting portion 7CP and the connecting portion 7DP and the lower ends of the four corners of the upper cover member 4U. In this state, the upper cover member 4U and the base member 18 may be fixed at least partially with an adhesive. As a result, the third metal member 7C, the fourth metal member 7D, and the upper cover member 4U are electrically integrated and grounded via the terminal portion 7DT of the fourth metal member 7D.

Next, with reference to FIGS. 15 and 16, the details of the grounding terminal (terminal portion 7DT of the fourth metal member 7D) in the lens driving device 101 will be described. FIG. 15 is a downward perspective view of the lens driving device 101. Specifically, FIG. 15A is a downward perspective view of the entire lens driving device 101. In FIG. 15A, the lower cover member 4L is not shown for the sake of clarity. FIG. 15B is an enlarged view of the range R4 surrounded by the broken line shown in FIG. 15A. FIG. 16 is an enlarged view of the bottom of the lens driving device 101. Specifically, FIG. 16A is an enlarged bottom view of the lens driving device 101. In FIG. 16A, the lower cover member 4L is not shown for the sake of clarity. 16 (B) is a cross-sectional view of the bottom of the lens driving device 101 in the XZ plane including the alternate long and short dash line L1 shown in FIG. 16 (A). In FIG. 16B, members other than the cover member 4, the metal member 7, and the base member 18 are not shown for the sake of clarity. Further, in FIGS. 15 and 16, a fine dot pattern is attached to the metal member 7 for clarification.

As shown in FIG. 14B, the terminal portion 7DT as the grounding terminal constitutes a part of the fourth metal member 7D.

As shown in FIGS. 15B and 16B, the fourth metal member 7D is located near the lower end portion 4AE of the second side plate portion 4A2 constituting the first outer peripheral wall portion 4A of the upper cover member 4U. The exposed portion 7DX exposed from the base member 18 is provided. As shown in FIG. 16B, the exposed portion 7DX faces the upper surface (Z1 side surface) of the bottom plate portion 4D of the lower cover member 4L in the optical axis direction (Z-axis direction).

The exposed portion 7DX, the upper cover member 4U (second side plate portion 4A2), and the lower cover member 4L (second side plate portion 4C2 and bottom plate portion 4D) are connected by a conductive adhesive EA. In FIGS. 16A and 16B, the conductive adhesive EA is represented by a coarse dot pattern.

As shown in FIG. 15B, the base member 18 is configured to form a concave accommodating portion SP in which the lower side (Z2 side) and the right side (X1 side) are open. In FIG. 15B, the accommodating portion SP is represented by a region surrounded by a broken line. The Z2 side means the bottom plate portion 4D side of the lower cover member 4L. Further, the X1 side means the second outer peripheral wall portion 4C side (second side plate portion 4C2 side) of the lower cover member 4L. In the example shown in FIG. 15B, the accommodating portion SP is used as a space for receiving the conductive adhesive EA. The exposed portion 7DX is arranged so as to define the ceiling surface (virtual surface on the Z1 side) of the accommodating portion SP. The ceiling surface of the accommodating portion SP is a surface facing the upper surface (Z1 side surface) of the bottom plate portion 4D in the optical axis direction. As shown in FIGS. 16A and 16B, the conductive adhesive EA is applied into the accommodating portion SP, and the bottom plate portion 4D and the second outer peripheral wall portion 4C (second) of the lower cover member 4L. It adheres to the side plate portion 4C2) and is covered by the bottom plate portion 4D and the second outer peripheral wall portion 4C (second side plate portion 4C2) of the lower cover member 4L. However, the conductive adhesive EA does not need to be completely covered by the lower cover member 4L, and a part of the conductive adhesive EA may be exposed.

As shown in FIGS. 15B and 16B, the exposed portion 7DX is outward to the right (X1) so that the upper surface (Z1 side surface) and the lower surface (Z2 side surface) are exposed. It has an extension 7DE extending in the direction). In the present embodiment, as shown in FIG. 16B, the extending portion 7DE is configured to protrude toward the X1 side from the side wall surface on the X1 side of the base member 18.

As shown in FIG. 15B, the upper cover member 4U has a connecting piece PC adjacent to the extending portion 7DE. The connection piece PC is formed so as to extend downward (Z2 direction) from the lower end portion 4AE of the first outer peripheral wall portion 4A (second side plate portion 4A2). In the present embodiment, as shown in FIGS. 15 (B) and 16 (B), the connection piece PC has a first outer periphery on the upper side (Z1 side) of the upper surface (Z1 side surface) of the extending portion 7DE. It is configured to extend downward (Z2 direction) from the lower end portion 4AE of the wall portion 4A to the surface of the exposed portion 7DX including the lower surface (Z2 side surface) of the extending portion 7DE.

As shown in FIGS. 16A and 16B, the conductive adhesive EA applied in the accommodating portion SP adheres to the extending portion 7DE and the connecting piece PC. In the present embodiment, the conductive adhesive EA has an upper surface (Z1 side surface), a lower surface (Z2 side surface), and a front surface (Y2 side surface) of the extending portion 7DE so as to wrap the extending portion 7DE. It adheres to the rear surface (the surface on the Y1 side) and the right surface (the surface on the X1 side). Further, the conductive adhesive EA covers the lower surface (Z2 side surface), the front surface (Y2 side surface), the left surface (X2 side surface), and the connection piece PC so as to wrap the connection piece PC at least partially. It is attached to the right surface (the surface on the X1 side).

Further, the conductive adhesive EA adheres to the right side surface (X1 side surface) of the base member 18 on the upper side (Z1 side) of the extending portion 7DE, and is surrounded by the broken line shown in FIG. 16 (B). In the range R5, it adheres to the inner surface (X2 side) of the second side plate portion 4A2. That is, the conductive adhesive EA enters the gap formed between the second side plate portion 4A2 and the base member 18 and hardens.

Further, the conductive adhesive EA adheres to the outer surface (X1 side) of the second side plate portion 4A2 in the range R6 surrounded by the broken line shown in FIG. 16B, and the conductive adhesive EA adheres to the surface of the second side plate portion 4C2. Adheres to the inner (X2 side) surface. That is, the conductive adhesive EA enters the gap formed between the first outer peripheral wall portion 4A (second side plate portion 4A2) and the second outer peripheral wall portion 4C (second side plate portion 4C2) and hardens.

As described above, the conductive adhesive EA is continuous from the extending portion 7DE to the space between the first outer peripheral wall portion 4A and the second outer peripheral wall portion 4C (the space represented by the range R6 surrounded by the broken line). is doing. That is, the conductive adhesive EA is attached to the extending portion 7DE, the first outer peripheral wall portion 4A, and the second outer peripheral wall portion 4C in a state of being a single mass.

With the above configuration, the grounding terminal (terminal portion 7DT of the fourth metal member 7D), the first outer peripheral wall portion 4A (second side plate portion 4A2), and the second outer peripheral wall portion 4C (second side plate portion 4C2) Are electrically connected via the conductive adhesive EA. Further, the fourth metal member 7D including the grounding terminal (terminal portion 7DT), the first outer peripheral wall portion 4A (second side plate portion 4A2), the second outer peripheral wall portion 4C (second side plate portion 4C2), and the base member 18. Is mechanically bonded via the conductive adhesive EA.

Further, as shown in FIG. 16B, the first outer peripheral wall portion 4A of the upper cover member 4U is the second of the lower cover member 4L in the direction perpendicular to the optical axis (X-axis direction and Y-axis direction). It is configured to partially overlap the outer peripheral wall portion 4C. That is, the end surface of the lower end portion 4AE of the first outer peripheral wall portion 4A is configured to be located below the end surface of the upper end portion 4CE of the second outer peripheral wall portion 4C (Z2 side).

In this configuration, since the lower end portion 4AE of the upper cover member 4U is covered by the lower cover member 4L, the internal space of the housing HS (cover member 4) is electromagnetically isolated from the external space. As a result, the image pickup device arranged below the lens holding member 2 is less susceptible to noise.

Next, with reference to FIGS. 17 and 18, a lens driving device 101A, which is another embodiment of the lens driving device 101, will be described. FIG. 17 is a perspective view of the lens driving device 101A. Specifically, FIG. 17A is an upward perspective view of the lens driving device 101A, and FIG. 17B is a downward perspective view of the lens driving device 101A. In FIG. 17, a dot pattern is attached to the lower cover member 4L for clarification. FIG. 18 is an enlarged view of the range R7 surrounded by the broken line shown in FIG. 17 (B). Specifically, FIG. 18A is an enlarged bottom view of the lens driving device 101A. FIG. 18B is an enlarged perspective view of the bottom portion of the lens driving device 101A. FIG. 18C is an enlarged perspective view of the bottom of the lens driving device 101A in a state where the lower cover member 4L is removed, and corresponds to FIG. 18B. In FIG. 18, for the sake of clarity, a coarse dot pattern is attached to the base member 18, and a fine dot pattern is attached to the metal member 7.

The lens driving device 101A is different from the lens driving device 101 in that a grounding terminal is formed by a bent piece FD obtained by bending a part of the bottom plate portion 4D of the lower cover member 4L. In the lens driving device 101, a grounding terminal (terminal portion 7DT) is formed by a part of the metal member 7 (fourth metal member 7D). However, the lens driving device 101A is basically the same as the lens driving device 101 except for the configuration related to the grounding terminal. Therefore, in the following, the explanation of the common part is omitted, and the difference part is explained in detail.

In the example shown in FIGS. 17 and 18, the bent piece FD as the grounding terminal is arranged inside the second outer peripheral wall portion 4C (the side closer to the optical axis JD). Specifically, as shown in FIG. 18A, the bent piece FD includes the bent piece FD in the Y-axis direction and the outer surface (the surface on the Y2 side) of the second outer peripheral wall portion 4C (first side plate portion 4C1). The distance X1 between the other terminals such as the terminal portion 7AT which is a part of the metal member 7 (first metal member 7A) and the outer surface of the second outer peripheral wall portion 4C (first side plate portion 4C1). It is configured to be the same as the distance X2. However, the distance X1 may be different from the distance X2. That is, the distance X1 may be smaller than the distance X2 and may be larger than the distance X2.

The lower end portion 4AE of the first outer peripheral wall portion 4A (second side plate portion 4A2) and the lower cover member 4L (second side plate portion 4C2) are the same as in the case of the lens driving device 101 shown in FIG. 16 (B). They are connected by a conductive adhesive EA. The lower side (Z2 side) of the conductive adhesive EA is covered with the bottom plate portion 4D of the lower cover member 4L, and the right side (X1 side) of the conductive adhesive EA is the second side of the lower cover member 4L. It is covered by the side plate portion 4C2. However, the conductive adhesive EA does not need to be completely covered by the lower cover member 4L, and a part of the conductive adhesive EA may be exposed.

As shown in FIG. 18C, the base member 18 has a concave accommodating portion SP in which the bottom plate portion 4D side (Z2 side) and the second outer peripheral wall portion 4C side (X1 side) of the lower cover member 4L are opened. Is configured to form. Then, the conductive adhesive EA is applied to the accommodating portion SP in the same manner as in the case of the lens driving device 101 shown in FIG. 16 (B).

The conductive adhesive EA applied in the accommodating portion SP adheres to the upper cover member 4U and the lower cover member 4L, as in the case of the lens driving device 101 shown in FIG. 16 (B). In the present embodiment, the conductive adhesive EA adheres to the side surface (X1 side surface) of the base member 18 and also adheres to the inner surface (X2 side) of the second side plate portion 4A2. That is, the conductive adhesive EA enters the gap formed between the second side plate portion 4A2 and the base member 18 and hardens.

Further, the conductive adhesive EA adheres to the outer surface (X1 side) of the second side plate portion 4A2 and adheres to the inner surface (X2 side) of the second side plate portion 4C2. That is, the conductive adhesive EA enters the gap formed between the first outer peripheral wall portion 4A (second side plate portion 4A2) and the second outer peripheral wall portion 4C (second side plate portion 4C2) and hardens.

With the above configuration, the lower cover member 4L including the grounding terminal (bent piece FD) and the upper cover member 4U including the first outer peripheral wall portion 4A (second side plate portion 4A2) are formed by the conductive adhesive EA. It is electrically connected via. Further, the lower cover member 4L including the grounding terminal (bent piece FD), the upper cover member 4U including the first outer peripheral wall portion 4A (second side plate portion 4A2), and the base member 18 have a conductive adhesive EA. It is mechanically joined through.

Further, in the examples shown in FIGS. 17 and 18, the lower cover member 4L including the grounding terminal (bent piece FD) is electrically connected to the metal member 7, but the metal member 7 and the cover member 4 are connected to each other. Does not have to be electrically connected.

Next, with reference to FIGS. 19 and 20, a lens driving device 101B, which is still another embodiment of the lens driving device 101, will be described. FIG. 19 is a perspective view of the lens driving device 101B. Specifically, FIG. 19A is an upward perspective view of the lens driving device 101B, and FIG. 19B is a downward perspective view of the lens driving device 101B. FIG. 20 is an enlarged view of the bottom of the lens driving device 101B. Specifically, FIG. 20 (A1) is an enlarged perspective view of the bottom of the lens driving device 101B when the lens driving device 101B is viewed from diagonally lower right, and is surrounded by a broken line shown in FIG. 19 (B). It corresponds to an enlarged view of the range R8. FIG. 20 (B1) is an enlarged perspective view of the bottom of the lens driving device 101B when the lens driving device 101B is viewed from another direction. 20 (A2) is an enlarged perspective view of the bottom of the lens driving device 101B in a state where the lower cover member 4L is removed, and corresponds to FIG. 20 (A1). 20 (B2) is an enlarged perspective view of the bottom of the lens driving device 101B in a state where the lower cover member 4L is removed, and corresponds to FIG. 20 (B1). In FIGS. 19 and 20, a fine dot pattern is attached to the lower cover member 4L for clarification. Further, in FIG. 20, a coarse dot pattern is attached to the base member 18 for clarification.

As shown in FIG. 20B, the lens driving device 101B has a grounding terminal formed by a protruding piece PD formed at the lower end portion 4AE of the first outer peripheral wall portion 4A of the upper cover member 4U. It is different from the lens drive device 101. In the lens driving device 101, a grounding terminal (terminal portion 7DT) is formed by a part of the metal member 7 (fourth metal member 7D). However, the lens driving device 101B is basically the same as the lens driving device 101 except for the configuration related to the grounding terminal. Therefore, in the following, the explanation of the common part is omitted, and the difference part is explained in detail.

In the example shown in FIGS. 19 and 20, the projecting piece PD as the grounding terminal is arranged at a position closer to the central portion of the first side plate portion 4C1 than the terminal portion 7AT of the first metal member 7A. The protruding piece PD is formed so as to have the same protruding amount as other terminals such as the terminal portion 7AT which is a part of the first metal member 7A.

Specifically, the projecting piece PD is arranged inside (a position close to the optical axis JD) of the outer surface (the surface on the Y1 side) of the second outer peripheral wall portion 4C (first side plate portion 4C1). Then, as shown in FIG. 20 (B1), the projecting piece PD projects downward (Z2 direction) from the bottom plate portion 4D through the penetrating portion 4DH formed at the edge of the bottom plate portion 4D of the lower cover member 4L. It is configured to do.

Also in the lens driving device 101B, as shown in FIGS. 20 (A2) and 20 (B2), the fourth metal member 7D is a second side plate portion 4A2 constituting the first outer peripheral wall portion 4A of the upper cover member 4U. An exposed portion 7DX located near the lower end portion 4AE and exposed from the base member 18 is provided. The exposed portion 7DX faces the upper surface (Z1 side surface) of the bottom plate portion 4D of the lower cover member 4L, as in the case of the lens driving device 101 shown in FIG. 16B. The exposed portion 7DX, the upper cover member 4U, and the lower cover member 4L are connected by the conductive adhesive EA.

Further, as shown in FIG. 20 (A2), the base member 18 is configured to form a concave accommodating portion SP in which the lower side (Z2 side) and the right side (X1 side) are open. Then, the accommodating portion SP is used as a space for receiving the conductive adhesive EA. The conductive adhesive EA is applied into the accommodating portion SP as in the case of the lens driving device 101 shown in FIG. 16B, and the bottom plate portion 4D and the second outer peripheral wall portion 4C (second outer peripheral wall portion 4C) of the lower cover member 4L. It adheres to the 2 side plate portion 4C2) and is covered by the bottom plate portion 4D and the second outer peripheral wall portion 4C (second side plate portion 4C2) of the lower cover member 4L. However, the conductive adhesive EA does not need to be completely covered by the lower cover member 4L, and a part of the conductive adhesive EA may be exposed.

The conductive adhesive EA applied in the accommodating portion SP adheres to the extending portion 7DE and the connecting piece PC as in the case of the lens driving device 101 shown in FIG. 16 (B). In this example, the conductive adhesive EA encloses the extending portion 7DE on the upper surface (Z1 side surface), the lower surface (Z2 side surface), the front surface (Y2 side surface), and the rear surface of the extending portion 7DE. It adheres to (the surface on the Y1 side) and the right surface (the surface on the X1 side). Further, the conductive adhesive EA covers the lower surface (Z2 side surface), the front surface (Y2 side surface), the left surface (X2 side surface), and the connection piece PC so as to wrap the connection piece PC at least partially. It is attached to the right surface (the surface on the X1 side).

With the above configuration, the first outer peripheral wall portion 4A (second side plate portion 4A2), the second outer peripheral wall portion 4C (second side plate portion 4C2), and the metal member 7 (second side plate portion 4C2) connected to the projecting piece PD as the grounding terminal. 4 The metal member 7D) is electrically connected to the metal member 7D) via the conductive adhesive EA. Specifically, in the lower cover member 4L, in a portion different from the portion where the projecting piece PD is arranged, the metal member 7 (the first) embedded in the first outer peripheral wall portion 4A, the bottom plate portion 4D, and the base member 18. 4 The metal member 7D) is electrically connected to the conductive adhesive EA. Further, the first outer peripheral wall portion 4A (second side plate portion 4A2), the second outer peripheral wall portion 4C (second side plate portion 4C2), the metal member 7 (fourth metal member 7D), and the base member 18 are conductively bonded to each other. It is mechanically bonded via the agent EA.

As described above, the lens driving device 101 (including the lens driving device 101A and the lens driving device 101B) is arranged in the fixed side member RG including the cover member 4 as the housing HS and in the cover member 4. It includes a lens holding member 2 capable of holding a lens body, and a drive mechanism MK for moving the lens holding member 2 with respect to the fixed side member RG. The fixed side member RG is a metal first cover member (upper cover member 4U) having a first outer peripheral wall portion 4A and a top plate portion 4B, and a top plate portion 4B of the upper cover member 4U sandwiching the lens holding member 2. It has a base member 18 facing the base member 18, a bottom plate portion 4D facing the lower end portion 4AE of the base member 18 and the first outer peripheral wall portion 4A, and a second outer peripheral wall portion 4C arranged outside the first outer peripheral wall portion 4A. It is provided with a second cover member (lower cover member 4L) made of metal. The upper cover member 4U and the lower cover member 4L are electrically connected to each other, and the grounding terminal conducting to the upper cover member 4U is a bottom plate portion 4D from a position inside the second outer peripheral wall portion 4C. It protrudes downward (Z2 direction). The grounding terminal is, for example, a bent piece FD obtained by bending a part of the terminal portion 7DT of the fourth metal member 7D shown in FIG. 15 (B) and the bottom plate portion 4D of the lower cover member 4L shown in FIG. 17 (B). Alternatively, it is a protruding piece PD formed on the lower end portion 4AE of the upper cover member 4U shown in FIG. 19 (B). The grounding terminal may be used for grounding an electronic device housed in the housing HS, such as a driver IC (control circuit) that controls a current flowing through the coil 3.

The terminal portion 7DT, the bent piece FD, and the projecting piece PD as grounding terminals are all arranged inside (the side closer to the optical axis JD) of the second outer peripheral wall portion 4C of the lower cover member 4L. Therefore, in the lens driving device 101, the grounding terminal does not need to be bent inward.

This configuration can realize further miniaturization of the lens driving device 101. For example, this configuration can suppress or prevent the conductive adhesive for connecting the grounding terminal to the external substrate or the bonding material such as solder from protruding to the outside of the lens driving device 101. As a result, this configuration can suppress the increase in size of the external substrate on which the lens driving device 101 is mounted. This is because the external substrate does not need to be formed in a large size in consideration of the protrusion of the bonding material.

As shown in FIG. 14, for example, the base member 18 may be formed of a synthetic resin material in which a metal member 7 is embedded. In this case, as shown in FIG. 14B, the metal member 7 may be provided with a grounding terminal (terminal portion 7DT of the fourth metal member 7D). That is, the grounding terminal does not need to be provided on the second cover member (lower cover member 4L).

This configuration comprises the material and thickness of the second cover member (lower cover member 4L) and the material and thickness of the metal member 7 embedded in the base member 18, that is, the grounding terminal (terminal of the fourth metal member 7D). The material and thickness of the portion 7DT) can be set individually, and the degree of freedom in designing the lens driving device 101 can be increased.

The metal member 7 (fourth metal member 7D) is located near the lower end portion 4AE of the first outer peripheral wall portion 4A of the first cover member (upper cover member 4U), for example, as shown in FIG. 15 (B). An exposed portion 7DX exposed from the base member 18 may be provided. In this case, the exposed portion 7DX is configured to be connected to the grounding terminal (terminal portion 7DT). Then, as shown in FIG. 16B, the exposed portion 7DX faces the bottom plate portion 4D of the second cover member (lower cover member 4L) in the optical axis direction, and the exposed portion 7DX and the first cover member (Upper cover member 4U) and second cover member (lower cover member 4L) are connected by a conductive adhesive EA represented by a coarse dot pattern.

In this configuration, three members (metal member 7 (exposed portion 7DX), first cover member (upper cover member 4U), and second cover member (lower cover member 4L)) are simultaneously electrically and mechanically connected. It is possible to improve the productivity of the lens driving device 101.

As shown in FIGS. 15B and 16B, for example, the base member 18 has a bottom plate portion 4D side (Z2 side) and a second outer peripheral wall portion 4C side of the second cover member (lower cover member 4L). It may be configured to form a concave accommodating portion SP that is open from (X1 side). In the example shown in FIGS. 15B and 16B, the accommodating portion SP is used as a space for receiving the conductive adhesive EA. In this case, the exposed portion 7DX is arranged so as to define the ceiling surface (virtual surface on the Z1 side) of the accommodating portion SP. The ceiling surface is a surface facing the upper surface (Z1 side surface) of the bottom plate portion 4D in the optical axis direction (Z-axis direction). As shown in FIGS. 16A and 16B, the conductive adhesive EA represented by the coarse dot pattern is provided in the accommodating portion SP, and is provided on the second cover member (lower cover member 4L). It adheres to the bottom plate portion 4D and the second outer peripheral wall portion 4C, and is covered by the bottom plate portion 4D and the second outer peripheral wall portion 4C of the second cover member (lower cover member 4L).

This configuration can increase the strength of adhesion by the conductive adhesive EA. Further, in this configuration, the conductive adhesive EA can be protected by the second cover member (lower cover member 4L). The conductive adhesive EA does not need to be completely covered by the second cover member, and may be partially covered by the second cover member so as to be partially exposed.

As shown in FIG. 15B, for example, the exposed portion 7DX has an extending portion 7DE extending outward (in the X1 direction) so that the upper surface (Z1 side surface) and the lower surface (Z2 side surface) are exposed. You may have. In this case, the first cover member (upper cover member 4U) may have a connecting piece PC adjacent to the extending portion 7DE. Then, the conductive adhesive EA may be attached to the extending portion 7DE and the connecting piece PC, for example, as shown in FIGS. 16A and 16B.

Further, as shown in FIG. 16B, for example, the conductive adhesive EA is a space (range surrounded by a broken line) between the extending portion 7DE and the first outer peripheral wall portion 4A and the second outer peripheral wall portion 4C. It may be continuous up to the space represented by R6). That is, the conductive adhesive EA may be attached to the extending portion 7DE, the first outer peripheral wall portion 4A, and the second outer peripheral wall portion 4C in a state of being a single mass.

This configuration can improve the reliability of the electrical connection between the first cover member (upper cover member 4U) and the metal member 7 (fourth metal member 7D). Further, this configuration can improve the reliability of the mechanical connection between the first cover member (upper cover member 4U) and the metal member 7 (fourth metal member 7D).

As shown in FIG. 17B, for example, the grounding terminal may be formed by a bent piece FD obtained by bending the bottom plate portion 4D of the second cover member (lower cover member 4L).

In this configuration, even when the metal member 7 is embedded in the base member 18, it is not necessary to consider the connection between the metal member 7 and the grounding terminal (bent piece FD), so that the degree of freedom in the layout of the metal member 7 is high. Can be enhanced. In the examples shown in FIGS. 17 and 18, the metal member 7 is electrically connected to the cover member 4, but may not be electrically connected to the cover member 4.

Even when the grounding terminal is formed by the bent piece FD, the lower end portion 4AE and the second cover member (lower cover member 4L) of the first outer peripheral wall portion 4A of the first cover member (upper cover member 4U) are formed. And may be connected by a conductive adhesive EA, for example, as shown in FIG. 16 (B). In this case as well, at least a part of the conductive adhesive EA may be covered with the second cover member (lower cover member 4L). This is so that the conductive adhesive EA can be protected by the second cover member (lower cover member 4L).

As shown in FIG. 18C, for example, the base member 18 has a bottom plate portion 4D side (Z2 side) and a second outer peripheral wall portion 4C side (X1 side) of the second cover member (lower cover member 4L). It may be configured to form an open concave accommodating portion SP. The conductive adhesive EA may be provided in the accommodating portion SP.

This configuration can improve the reliability of the connection between the base member 18 and the second cover member (lower cover member 4L) by the conductive adhesive EA.

The lower end portion 4AE of the first outer peripheral wall portion 4A of the first cover member (upper cover member 4U) has a second cover member (lower cover member) as shown in FIGS. 20 (B1) and 20 (B2), for example. A protruding piece PD may be provided that projects downward (Z2 direction) from the bottom plate portion 4D through the penetrating portion 4DH formed in the bottom plate portion 4D of 4L). In this case, the protruding piece PD may form a grounding terminal.

As shown in FIG. 20A, for example, the base member 18 has a bottom plate portion 4D side (Z2 side) and a second outer peripheral wall portion 4C side (X1 side) of the second cover member (lower cover member 4L). It may be configured to form an open concave accommodating portion SP. Then, a part of the metal member 7 (fourth metal member 7D) embedded in the base member 18 may be exposed as the exposed portion 7DX in the accommodating portion SP. Further, the accommodating portion SP may be provided with the conductive adhesive EA.

In this case, the conductive adhesive EA is the first outer peripheral wall portion 4A of the first cover member (upper cover member 4U), the bottom plate portion 4D of the second cover member (lower cover member 4L), and the second outer peripheral wall portion. It adheres to the 4C and the metal member 7 (fourth metal member 7D), and at least a part of the second cover member (lower cover member 4L) is covered by the bottom plate portion 4D and the second outer peripheral wall portion 4C. May be good. The protruding piece PD, which is a grounding terminal, may be used for grounding an electronic component housed in the housing HS, such as a driver IC that controls a current flowing through the coil 3.

This configuration allows three members (upper cover member 4U, lower cover member 4L, and metal member 7) to be electrically and mechanically connected at the same time, improving the productivity of the lens drive device 101. be able to.

The preferred embodiment of the present invention has been described in detail above. However, the invention is not limited to the embodiments described above. Various modifications or substitutions can be applied to the above-described embodiments without departing from the scope of the present invention. Further, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical conflict.

For example, in the above embodiment that realizes the automatic focus adjustment function, the first lower leaf spring 26A and the extending portion 33A are electrically and mechanically connected, and the second lower leaf spring 26B and the extending portion 33B are connected to each other. Is electrically and mechanically connected, but the present invention is not limited to this configuration. In the present invention, for example, in a lens driving device with an image stabilization function, the upper leaf spring 16 is divided into two, one of which is electrically and mechanically connected to the extending portion 33A, and the other is extended. It may include a configuration that is electrically and mechanically connected to the existing portion 33B. In this configuration, the upper leaf spring 16 is arranged so as to connect the magnet holder as a support member and the lens holding member 2, and is configured to support the lens holding member 2 so as to be movable in the optical axis direction. .. In this case, the upper leaf spring 16 has an inner portion 16i as a first support portion fixed to the lens holding member 2, an outer portion 16e as a second support portion fixed to the magnet holder, and an inner portion 16i and an outer side. Includes an elastic arm portion 16g located between the portion 16e. The magnet holder is a member that holds the magnet 5 facing the coil 3 held by the lens holding member 2, and is typically connected to the base member 18 via a suspension wire in the optical axis direction by the suspension wire. It is supported so that it can be moved in the direction perpendicular to the magnet. Specifically, the magnet holder is perpendicular to the optical axis direction by a drive mechanism composed of a magnet 5 and a coil different from the coil 3 installed on the base member 18 so as to face the magnet 5. It is configured to be able to move in a direction. In this configuration, a flange portion having a notch may be provided on the upper end side (Z1 side) of the lens holding member 2. Further, the projecting portion 72 is provided so as to project upward from the upper end portion which is one end portion in the optical axis direction of the lens holding member 2 on the side where the upper leaf spring 16 is arranged. The magnet holder functions as a fixed-side member that does not move in the optical axis direction with respect to the lens holding member that moves in the optical axis direction.

Further, in the above-described embodiment, the coil 3 is wound in an octagonal ring shape on the outer peripheral surface side of the lens holding member 2. However, the present invention is not limited to this configuration. The coil 3 has an oval or oval coil body portion held on the side surface of the lens holding member 2, that is, a coil body portion arranged so that the central axis is perpendicular to the optical axis direction. It may be a coil. Specifically, the coil 3 has four oval-shaped coil main bodies held on each of the four side surfaces of the lens holding member 2 provided with the coil support portion 12j having a substantially rectangular outer shape when viewed from above. It may be a coil, or it may be a coil having two oval-shaped coil main bodies held on each of the two facing surfaces of the lens holding member 2. In this case, the first magnet 5A may be a combination of two two-pole magnets or one quadrupole magnet. The same applies to the second magnet 5B.

Further, although the magnet 5 is arranged so as to face two of the four side portions of the lens holding member 2, it may be arranged so as to face each of the four side portions, and the four magnets 5 may be arranged so as to face each of the four side portions. It may be arranged so as to face each of the square wall portions.

Further, in the above-described embodiment, the drive mechanism MK is configured to utilize the coil 3 provided in the lens holding member 2 and the magnet 5 arranged so as to face the coil 3, but is piezoelectric. Other drive methods such as the method may be used. When the piezoelectric method is adopted, the cover member 4 may be made of a magnetic metal.

1 ... Spacer 2 ... Lens holding member 2t ... Protruding part 3 ... Coil 4 ... Cover member 4A ... 1st outer peripheral wall part 4A1 ... 1st side plate part 4A2 ...・ 2nd side plate part 4A3 ・ ・ ・ 3rd side plate part 4A4 ・ ・ ・ 4th side plate part 4AE ・ ・ ・ Lower end part 4B ・ ・ ・ Top plate part 4C ・ ・ ・ 2nd outer peripheral wall part 4C1 ・ ・ ・ 1st side plate Part 4C2 ・ ・ ・ 2nd side plate part 4C3 ・ ・ ・ 3rd side plate part 4C4 ・ ・ ・ 4th side plate part 4CE ・ ・ ・ Upper end part 4D ・ ・ ・ Bottom plate part 4DH ・ ・ ・ Penetration part 4k ・ ・ ・ Opening 4L ・・ ・ Lower cover member 4m ・ ・ ・ Opening 4s ・ ・ ・ Storage part 4U ・ ・ ・ Upper cover member 5 ・ ・ ・ Magnet 5A ・ ・ ・ 1st magnet 5B ・ ・ ・ 2nd magnet 6 ・ ・ ・ Leaf spring 7・ ・ ・ Metal member 7A ・ ・ ・ First metal member 7AP ・ ・ ・ Exposed part 7AT ・ ・ ・ Terminal part 7B ・ ・ ・ Second metal member 7BP ・ ・ ・ Exposed part 7BT ・ ・ ・ Terminal part 7C ・ ・ ・ No. 3 Metal member 7CP ・ ・ ・ Connection part 7D ・ ・ ・ 4th metal member 7DE ・ ・ ・ Extension part 7DP ・ ・ ・ Connection part 7DT ・ ・ ・ Terminal part 7DX ・ ・ ・ Exposed part 12 ・ ・ ・ Cylindrical part 12d・ ・ ・ Pedestal part 12dh ・ ・ ・ Recessed part 12h ・ ・ ・ Eave part 12j ・ ・ ・ Coil support part 13 ・ ・ ・ Winding part 16 ・ ・ ・ Upper leaf spring 16b ・ ・ ・ Corner part 16e ・ ・ ・ Outer part 16g・ ・ ・ Elastic arm 16i ・ ・ ・ Inner part 16r ・ ・ ・ Cross 18 ・ ・ ・ Base member 18k ・ ・ ・ Opening 18t ・ ・ ・ Protruding part 26 ・ ・ ・ Lower leaf spring 26A ・ ・ ・ First lower Side leaf spring 26B ・ ・ ・ Second lower leaf spring 26c ・ ・ ・ Inner joint part 26d ・ ・ ・ Outer joint part 26e ・ ・ ・ Outer part 26g ・ ・ ・ Elastic arm part 26h ・ ・ ・ Connection plate part 26i ・ ・ ・ Inner Part 26p ・ ・ ・ Connecting part 26r ・ ・ ・ Through hole 26s ・ ・ ・ Through hole 33, 33A, 33B ・ ・ ・ Extension part 33c ・ ・ ・ Opposing part 33k ・ ・ ・ Insertion part 33m ・ ・ ・ Winding part 52 ・・ ・ Flange part 52k ・ ・ ・ Notch part 72, 72A, 72B ・ ・ ・ Protruding part 82 ・ ・ ・ Jetty part 82s ・ ・ ・ Accommodating part 101, 101A, 101B ・ ・ ・ Lens drive device AD ・ ・ ・ Adhesive CA・ ・ ・ Conductive adhesive EA ・ ・ ・ Conductive adhesive FD ・ ・ ・ Bent piece H S ・ ・ ・ Housing JD ・ ・ ・ Optical axis MK ・ ・ ・ Drive mechanism PC ・ ・ ・ Connection piece PD ・ ・ ・ Protruding piece RG ・ ・ ・ Fixed side member SP ・ ・ ・ Accommodating part

Claims (11)

Fixed side members including the housing and
A lens holding member that is arranged in the housing and can hold the lens body,
In a lens driving device provided with a driving mechanism for moving the lens holding member with respect to the fixed side member.
The fixed side member is
A first metal cover member having a first outer peripheral wall portion and a top plate portion, and
A base member facing the top plate portion of the first cover member with the lens holding member interposed therebetween
A metal second cover member having a base member, a bottom plate portion facing the lower end portion of the first outer peripheral wall portion, and a second outer peripheral wall portion arranged outside the first outer peripheral wall portion. Prepare,
The first cover member and the second cover member are electrically connected to each other.
The grounding terminal conducting to the first cover member projects downward from the bottom plate portion from a position inside the second outer peripheral wall portion.
Lens drive device. The base member is formed of a synthetic resin material in which a metal member is embedded, and the metal member is provided with the grounding terminal.
The lens driving device according to claim 1. The metal member is connected to the grounding terminal and includes an exposed portion that is located in the vicinity of the lower end portion of the first outer peripheral wall portion of the first cover member and is exposed from the base member.
The exposed portion faces the bottom plate portion of the second cover member, and is opposed to the bottom plate portion.
The exposed portion, the first cover member, and the second cover member are connected by a conductive adhesive.
The lens driving device according to claim 2. The base member is configured to form a concave accommodating portion in which the bottom plate portion side and the second outer peripheral wall portion side of the second cover member are opened.
The exposed portion is arranged so as to define the ceiling surface of the accommodating portion.
The ceiling surface is a surface facing the bottom plate portion, and is a surface facing the bottom plate portion.
The conductive adhesive is provided in the accommodating portion and adheres to the bottom plate portion and the second outer peripheral wall portion of the second cover member, as well as the bottom plate portion of the second cover member and the first cover member. 2 At least part of the outer wall is covered,
The lens driving device according to claim 3. The exposed portion has an extending portion extending outward so that the upper surface and the lower surface are exposed.
The conductive adhesive is continuous from the extending portion to the space between the first outer peripheral wall portion and the second outer peripheral wall portion, and the extending portion, the first outer peripheral wall portion, and the said. Adhering to the second outer wall,
The lens driving device according to claim 4. The grounding terminal is formed by a bent piece obtained by bending the bottom plate portion of the second cover member.
The lens driving device according to claim 1. The lower end of the first outer peripheral wall portion of the first cover member and the second cover member are connected by a conductive adhesive.
At least a part of the conductive adhesive is covered by the second cover member.
The lens driving device according to claim 6. The base member is configured to form a concave accommodating portion in which the bottom plate portion side and the second outer peripheral wall portion side of the second cover member are opened.
The conductive adhesive is provided in the housing portion.
The lens driving device according to claim 7. At the lower end of the first outer peripheral wall portion of the first cover member, a protruding piece is provided that projects downward from the bottom plate portion through a penetration portion formed in the bottom plate portion of the second cover member. Cover,
The protruding piece constitutes the grounding terminal.
The lens driving device according to claim 1. The base member is configured to form a concave accommodating portion in which the bottom plate portion side and the second outer peripheral wall portion side of the second cover member are opened.
The metal member embedded in the base member is exposed in the accommodating portion, and a conductive adhesive is provided.
The conductive adhesive is attached to the first outer peripheral wall portion of the first cover member, the bottom plate portion of the second cover member, the second outer peripheral wall portion, and the metal member, and is attached to the metal member. At least a part is covered by the bottom plate portion and the second outer peripheral wall portion of the second cover member.
The lens driving device according to claim 9. The lens driving device according to any one of claims 1 to 10.
With the lens body
It has an image pickup element facing the lens body, and has.
The camera module.

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