JP6895583B2 - Lens drive and camera module - Google Patents

Description

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

Conventionally, a lens including a lens holding member capable of holding a lens body, a coil arranged on the outer periphery of the lens holding member, and an upper leaf spring and a lower leaf spring that movably support the lens holding member in the direction of the optical axis. A drive device is known (see Patent Document 1). Both the upper leaf spring and the lower leaf spring are provided with four arm portions connecting the inner portion and the outer portion.

Japanese Unexamined Patent Publication No. 2008-112200

However, the configuration in which the inner portion and the outer portion are connected by the four arm portions as described above requires a space for accommodating the four arm portions. Therefore, it hinders the miniaturization of the lens holding member.

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

The lens driving device according to the embodiment of the present invention includes a fixed side member, a lens holding member capable of holding a lens body, a leaf spring that movably supports the lens holding member in the direction of the optical axis, and the lens holding member. A lens driving device including a coil held by a member and a magnet facing the coil, wherein the leaf spring is an upper leaf spring arranged above the lens holding member and a lens holding member. Including a lower leaf spring arranged on the lower side, at least one of the upper leaf spring and the lower leaf spring connects the fixed side member and the lens holding member with two elastic arm portions, and the elasticity The arm portion has a first end portion connected to the fixed side member, a second end portion connected to the lens holding member, and a third end portion connected to the fixed side member or the lens holding member .

By the above-mentioned means, a lens driving device capable of further miniaturization is provided.

It is an exploded perspective view of the lens driving device. It is an upper perspective view of the lens driving device. It is a front view of the lens driving device. It is a top view of the lens driving device. It is a bottom view of the lens driving device. It is the upper perspective view of the lens driving device in the state which the case is omitted. It is a right side view of the lens driving device in the state where the case is omitted. It is an upper perspective view of the lens holding member. It is an upper perspective view of the lens holding member around which a coil is wound. It is a lower perspective view of a lens holding member. It is a lower perspective view of the lens holding member around which a coil is wound. It is a top view of the lens holding member. It is a right side view of a lens holding member. It is a lower perspective view of a lens holding member. It is a lower perspective view of the lens holding member around which a coil is wound. It is an enlarged view of a part of a lens holding member. It is an enlarged view of another part of a lens holding member. It is a bottom view of the lens driving device in a state where some members are omitted. It is a bottom view of the lens driving device in a state where some members are omitted. It is a top view of the upper leaf spring. It is the bottom view of the lower leaf spring. It is a figure explaining an example of the connection between a leaf spring and a coil in a lens driving device. It is a figure explaining an example of the connection between a leaf spring and a coil in a lens driving device. It is an upper perspective view of the base member of a lens driving device. It is an upper perspective view of the base member to which the lower leaf spring is assembled. It is an upper perspective view of the metal member embedded in a base member. It is a left side view of the protrusion formed on the lens holding member. It is a left side view of the protrusion formed on the lens holding member. It is an upper perspective view of the protrusion formed on the lens holding member. It is an upper perspective view of the protrusion formed on the lens holding member. It is a left side view of an example of a protrusion. It is a left side view of another example of a protrusion. It is a left side view of still another example of the protrusion. It is a top view of the upper leaf spring. It is the bottom view of the lower leaf spring.

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 an exploded perspective view of the lens driving device 101. FIG. 2A is an upward perspective view of the lens driving device 101, and FIG. 2B is a front view of the lens driving device 101 as viewed from the Y2 side. FIG. 3A is a top view of the lens driving device 101, and FIG. 3B is a bottom view of the lens driving device 101. FIG. 4A is an upward perspective view of the lens driving device 101 in a state where the case 4 is omitted, and corresponds to FIG. 2A. FIG. 4B is a right side view of the lens driving device 101 in a state where the case 4 is omitted, as seen from the X1 side.

As shown in FIG. 1, the lens driving device 101 has a lens holding member 2 capable of holding a lens body (not shown) and a lens holding member 2 in the direction of the optical axis JD (Z-axis direction) with respect to the lens body. It includes a drive mechanism MK that moves along the lens, a leaf spring 6 that movably supports the lens holding member 2 in the direction of the optical axis JD, and a fixed side member RG to which the leaf spring 6 is fixed. The lens body is, for example, a tubular lens barrel including at least one lens, and its central axis is configured to be along the direction of the optical axis JD.

As shown in FIG. 1, the drive mechanism MK includes a coil 3 wound in an octagonal ring shape and four magnets 5 arranged to face the coil 3. The fixed-side member RG includes a case 4 and a base member 18 in which a metal member 7 is embedded. The metal member 7 includes terminals 7A and 7B that provide an electrical connection to the outside. The leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the case 4, and a lower leaf spring 26 arranged between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B. The case 4 has a substantially rectangular tubular outer wall portion 4A and a flat plate annular upper surface portion 4B provided so as to be continuous with the upper end (Z1 side end) of the outer wall portion 4A. The outer wall portion 4A has a pair of first side plate portions 4A1 facing each other and a pair of second side plate portions 4A2 perpendicular to the first side plate portion 4A1 and facing each other.

The lens driving device 101 has a substantially rectangular parallelepiped shape and is mounted on a substrate (not shown) on which an image sensor (not shown) is mounted. The substrate, the lens driving device 101, the lens body mounted on the lens holding member 2, and the image pickup element mounted on the 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 26A, the lower leaf spring 26B, the terminal 7A, the terminal 7B, and the substrate. Therefore, the lower leaf spring 26A and the lower leaf spring 26B are formed of a conductive member such as metal. When a current flows through the coil 3, the drive mechanism MK generates an electromagnetic force along the direction of the optical axis JD.

The lens driving device 101 utilizes this electromagnetic force to move the lens holding member 2 along the direction of the optical axis JD on the Z1 side (subject side) of the image pickup device. 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 approaching the image sensor to enable infinity photography. ..

Next, the lens holding member 2 and the drive mechanism MK will be described. 5A is an upward perspective view of the lens holding member 2, and FIG. 5B is an upward perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 5A. FIG. 6A is a downward perspective view of the lens holding member 2, and FIG. 6B is a downward perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 6A. FIG. 7A is a top view of the lens holding member 2, and FIG. 7B is a right side view of the lens holding member 2 as viewed from the X1 side. FIG. 8A is a downward perspective view of the lens holding member 2, and FIG. 8B is a downward perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 shown in FIG. 8A. 9A is an enlarged view of the portion S shown in FIG. 8B, and FIG. 9B is an enlarged view of the portion P shown in FIG. 6B. FIG. 10A is a bottom view of the lens driving device 101 in which the metal member 7 and the base member 18 are omitted, and FIG. 10B is a lens driving device in which the lower leaf spring 26 and the lens holding member 2 are further omitted. It is a bottom view of 101.

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. 5A, the lens holding member 2 has a tubular portion 12 in which a through hole is formed along the direction of the optical axis JD and an image sensor side (Z2 side) in the direction of the optical axis JD. ) Is included with the flange portion (flange portion) 52 formed in the portion. In the present embodiment, the tubular portion 12 has a cylindrical portion on the subject side (Z1 side) in the direction of the optical axis JD.

The tubular portion 12 may be provided with a thread groove on the inner peripheral surface of the cylinder so that the lens body can be mounted. However, in the present embodiment, the lens body is configured to be fixed to the tubular portion 12 by an adhesive. Therefore, the tubular portion 12 is not formed with a thread groove. Further, as shown in FIG. 5A, the tubular portion 12 is provided with a pedestal portion 12d having two recesses 12dh on the end surface on the subject side. As shown in FIG. 4A, the inner portion 16i of the upper leaf spring 16 is placed on the pedestal portion 12d.

As shown in FIG. 5A, a coil support portion 12j is provided on the outer peripheral surface of the tubular portion 12 as an outer wall portion that supports the coil 3 from the inside. In the present embodiment, the coil support portion 12j has an octagonal outer shape as a whole so as to be able to support the octagonal annular coil 3. However, there is a portion where the coil support portion 12j is not formed on the outer peripheral surface of the tubular portion 12. On the subject side of the coil support portion 12j, an eaves portion 12h (see FIGS. 7A and 7B) is formed so as to face the flange portion 52 in the direction of the optical axis JD and project outward in the radial direction. Then, as shown in FIG. 5B, 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 direction of the optical axis JD so that the outer peripheral surface of the lens holding member 2 is formed. It is wound in an octagonal ring on the side. In this configuration, the eaves portion 12h and the flange portion 52 function as a regulating portion that regulates the movement of the coil 3 (winding portion 13) in the direction of the optical axis JD.

The flange portion 52 projects radially outward from the outer peripheral surface of the tubular portion 12 on the image sensor side (Z2 side). A coil 3 (winding portion 13) is arranged on the subject side of the flange portion 52.

As shown by the arrow AR1 in FIG. 6A, the flange portion 52 has two square convex projecting portions 72 projecting diagonally outward from the surface on the image sensor side (Z2 side) and the image sensor side (Z2 side). Includes four round convex projecting portions 2t protruding downward (Z2 direction) from the surface of the above.

As shown in FIG. 6B, the protruding portion 72 corresponds to the protruding portion 72A corresponding to the wire rod on the winding start side of the coil 3 (winding portion 13) and the wire rod on the winding end side of the coil 3 (winding portion 13). Includes a protruding portion 72B to be formed. Both ends of the wire rod constituting the coil 3 are wound and held around the protruding portion 72. The wire is wound by using, for example, an automatic winding machine.

The protrusion 72 is preferably configured such that the portion around which the wire rod is wound has a square columnar shape, as shown in FIG. 6A. In this case, of the edges corresponding to each of the four side sides, the edge between the side surface with which the wire rod first contacts and the side surface with which the wire rod contacts second is preferably curved. The curved edge can prevent an excessive force from being applied to the surface of the wire that comes into contact with the edge when the wire of the coil 3 is wound around the protrusion 72. The other three edges may be configured so that the edges stand (do not bend). Further, the protruding portion 72 may be configured such that the portion around which the wire rod is wound is cylindrical or elliptical columnar, or may be configured to be polygonal columnar such as triangular columnar, pentagonal columnar or hexagonal columnar. Good.

As shown in FIGS. 6A and 10A, the projecting portion 2t includes two projecting portions 2t corresponding to the lower leaf spring 26A and two projecting portions 2t corresponding to the lower leaf spring 26B. The inner portions 26i of the lower leaf spring 26A and the lower leaf spring 26B are mounted and fixed to the projecting portion 2t. To fix the inner portion 26i of the lower leaf spring 26A and the lower leaf spring 26B, heat or cold crimp the protruding portion 2t inserted into the through hole (see FIG. 11B) formed in the inner portion 26i. It is realized by applying. In the drawing, the projecting portion 2t is represented in a state where the tip is deformed after being subjected to hot caulking or cold caulking.

Next, the drive mechanism MK of the lens drive device 101 will be described. As shown in FIG. 10B, the drive mechanism MK includes a coil 3 and four magnets 5 arranged so as to face each of the four corners of the case 4. Then, the drive mechanism MK can generate a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and can move the lens holding member 2 up and down along the direction of the optical axis JD. ..

As shown in FIG. 6B, the coil 3 is formed by winding a conductive wire rod around the outer circumference of the lens holding member 2. The coil 3 includes a winding portion 13 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. 6B, 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. The same applies to the other drawings illustrating the winding portion 13.

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

Specifically, as shown in FIG. 9A, the extending portion 33A includes a winding portion 33m wound around the protruding portion 72A and a connecting portion 33c between the winding portion 13 and the winding portion 33m. As shown in FIG. 9B, the extending portion 33B includes a winding portion 33m wound around the protruding portion 72B and a connecting portion 33c between the winding portion 13 and the winding portion 33m.

In the present embodiment, the extending portion 33A is wound around the protruding portion 72A of the lens holding member 2 before the wire rod of the coil 3 is wound around the outer circumference of the lens holding member 2. In the example shown in FIG. 9A, a part of the wire rod of the coil 3 is wound around the protruding portion 72A for 3 turns. As a result, the winding portion 33m is formed on the protruding portion 72A, and a part of the extending portion 33A is held by the protruding portion 72A. However, the extending portion 33A may be wound around the protruding portion 72A after the wire rod of the coil 3 is wound around the outer circumference of the lens holding member 2.

Next, the wire rod is wound around the outer circumference of the lens holding member 2. At that time, as shown in FIG. 9A, the connecting portion 33c extends from the lower side to the upper side of the flange portion 52 and is connected to the winding start portion of the winding portion 13 to form the inner peripheral side of the winding portion 13. ..

As shown in FIG. 5B, the winding portion 13 of the coil 3 wound around the outer circumference 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 held on 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 supporting portion 12j (see FIG. 5A). ing. 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. The winding portion 13 of the coil 3 may be fixed to the coil support portion 12j with an adhesive.

When the winding of the wire rod around the outer circumference of the lens holding member 2 is completed, the extending portion 33B connected to the end of the winding portion 13 on the winding end side is an image sensor from the subject side of the flange portion 52 as shown in FIG. 9B. Pulled out to the side. Specifically, the connecting portion 33c extends so as to face the lower end surface of the winding portion 13, and the winding portion 33m is wound around the protruding portion 72B of the lens holding member 2. In the example shown in FIG. 9B, the extending portion 33B is wound around the protruding portion 72B for three turns.

Next, case 4 will be described. In the present embodiment, the case 4 is manufactured by subjecting a plate material made of a non-magnetic metal such as austenitic stainless steel to punching and drawing. Since it is made of non-magnetic metal, the case 4 is driven by another lens even when another lens driving device is arranged adjacent to the lens driving device 101 in a dual camera type portable device or the like. There is no magnetic adverse effect on the drive mechanism included in the device. Specifically, as shown in FIG. 1, the case 4 has a box-shaped outer shape that defines the storage portion 4s. The case 4 has a rectangular annular outer wall portion 4A and a flat plate-shaped upper surface portion 4B provided so as to be continuous with the upper end (Z1 side end) of the outer wall portion 4A. A plurality of (four in this embodiment) receiving portions 4R are formed on the upper surface portion 4B at a portion facing the magnet 5. The receiving portion 4R is formed so that its upper surface (Z1 side surface) is recessed, that is, its lower surface (Z2 side surface) projects toward the magnet 5 side (Z2 side). Further, as shown in FIG. 2A, a circular opening 4k is formed in the upper surface portion 4B. The case 4 configured in this way accommodates the coil 3 and the magnet 5 in the accommodating portion 4s as shown in FIG. 10B, and is coupled to the base member 18 together with the base member 18 as shown in FIG. 2A. Configure the housing. However, the case 4 may be replaced with a cover made of a magnetic metal such as iron. In this case, the case 4 functions as a yoke.

Next, the magnet 5 constituting the drive mechanism MK will be described. As shown in FIG. 1, the magnet 5 has a prismatic shape and is arranged so as to be housed in the case 4. Specifically, as shown in FIG. 10B, the four magnets 5 are located outside the coil 3 and are arranged so as to face each of the four corners of the case 4. The four magnets 5 are fixed to the inner surfaces of the first side plate portion 4A1 and the second side plate portion 4A2 by an adhesive. Further, the four magnets 5 are arranged so that, for example, the inside is the north pole and the outside is the south pole.

Next, the leaf spring 6 and the fixed side member RG will be described. 11A and 11B are views for explaining the leaf spring 6. FIG. 11A is a top view of the upper leaf spring 16, and FIG. 11B is a bottom view of the lower leaf spring 26. 12A and 12B are diagrams for explaining an example of the connection state between the lower leaf spring 26B and the coil 3. Specifically, FIG. 12A is an enlarged view of the portion T shown in FIG. 10A, and FIG. 12B shows the lower leaf spring 26B, the coil 3, and the lens holding member when the portion T shown in FIG. 10A is viewed from the X2 side. It is an enlarged view of 2. In addition, in FIG. 12A and FIG. 12B, the bonding material CA such as solder is shown by a cross-hatching pattern. 13A to 13C are views for explaining the base member 18 constituting the fixed side member RG. Specifically, FIG. 13A is an upward perspective view of the base member 18, FIG. 13B is an upward perspective view of a state in which the lower leaf spring 26 is assembled to the base member 18, and FIG. 13C is an upward perspective view of the base member 18. It is an upper perspective view of the embedded metal member 7.

The leaf spring 6 is made of a metal plate whose main material is a copper alloy. As shown in FIG. 1, the leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the case 4, and a lower leaf spring 6 arranged between the lens holding member 2 and the base member 18. 26 and is included. In the state where the lens holding member 2 and the leaf spring 6 (upper leaf spring 16, lower leaf spring 26A and lower leaf spring 26B) are engaged with each other, in the leaf spring 6, the lens holding member 2 is in the direction of the optical axis JD. The lens holding member 2 is supported in the air so as to be movable in the (Z-axis direction). The lower leaf spring 26 functions as a feeding member for supplying an electric current to the coil 3. Therefore, the lower leaf spring 26A is electrically and physically connected to one end of the coil 3, and the lower leaf spring 26B is electrically and physically connected to the other end of the coil 3. In the present embodiment, the upper leaf spring 16 may be formed of a non-conductive member because no current flows. A spacer member may be arranged between the upper leaf spring 16 and the case 4. This is to prevent the lens holding member 2 and the case 4 from colliding with each other when the lens holding member 2 moves in the Z1 direction. When a spacer member is provided, this spacer member constitutes a part of the fixed side member RG.

As shown in FIG. 11A, the upper leaf spring 16 has a substantially rectangular outer shape, and has an inner portion 16i as a movable side support portion fixed to the lens holding member 2 and a fixing fixed to the fixed side member RG. It includes an outer portion 16e as a side support portion and an elastic arm portion 16g located between the inner portion 16i and the outer portion 16e. The elastic arm portion 16g includes a first elastic arm portion 16g1 and a second elastic arm portion 16g2. The outer portion 16e has four corner portions 16b and four crosspieces 16r connecting two of the four corner portions 16b. The corner portion 16b is sandwiched and fixed by the receiving portion 4R (see FIG. 1) formed on the upper surface portion 4B of the case 4 and the magnet 5. In this way, the case 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, the inner portion 16i is placed on the pedestal portion 12d (see FIG. 5A) of the lens holding member 2 as shown in FIG. 4A. Then, by fixing the inner portion 16i and the pedestal portion 12d with an adhesive, the inner portion 16i is fixed to the lens holding member 2. As shown in FIG. 4B, the outer portion 16e is in contact with the upper surface (Z1 side surface) of the magnet 5 and is sandwiched and fixed between the case 4 and the magnet 5.

As shown in FIG. 11A, the upper leaf spring 16 is formed so as to be substantially point-symmetrical with respect to a black point representing the optical axis JD of the lens body. The upper leaf spring 16 is fixed to the lens holding member 2 at the inner portion 16i and fixed to the case 4 at the outer portion 16e. Therefore, the upper leaf spring 16 can support the lens holding member 2 in the air in a well-balanced manner.

As shown in FIG. 11B, the lower leaf spring 26A and the lower leaf spring 26B are configured so that their inner shapes are substantially semicircular. Each of the lower leaf spring 26A and the lower leaf spring 26B has an inner portion 26i as a movable side support portion fixed to the image sensor side of the lens holding member 2 and a fixed side support portion fixed to the fixed side member RG. The outer portion 26e and the elastic arm portion 26g located between the inner portion 26i and the outer portion 26e are included. Specifically, the lower leaf spring 26A includes an inner portion 26Ai, an outer portion 26Ae, and an elastic arm portion 26Ag. Further, the lower leaf spring 26B includes an inner portion 26Bi, an outer portion 26Be, and an elastic arm portion 26Bg.

As shown in FIG. 11B, the inner portion 26Ai and the inner portion 26Bi have two inner joint portions 26c engaged with the lens holding member 2, a connecting plate portion 26h facing the extending portion 33 of the coil 3, and 2 It includes two first connecting portions 26p that connect each of the two inner joining portions 26c and the connecting plate portion 26h.

When the lower leaf spring 26A and the 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. 6A has the lower leaf spring 26A and the lower leaf spring 26B shown in FIG. 11B. It is inserted and fitted into a circular through hole provided in each inner joint portion 26c of the lower leaf spring 26B. As a result, the inner portion 26Ai and the inner portion 26Bi are positioned and fixed to the lens holding member 2. Specifically, the inner portion 26Ai and the inner portion 26Bi are fixed to the lens holding member 2 by, for example, hot or cold caulking the protruding portion 2t of the lens holding member 2.

Hereinafter, the relationship between the lower leaf spring 26B, the lens holding member 2, and the coil 3 will be mainly described. However, the description regarding the lower leaf spring 26B also applies to the lower leaf spring 26A.

As shown in FIGS. 12A and 12B, the connecting plate portion 26h of the inner portion 26B of the lower leaf spring 26B faces the flange portion 52 of the lens holding member 2 when the lens driving device 101 is assembled. That is, as shown in FIG. 12A, the surface of the connection plate portion 26h on the subject side (Z1 side) faces the surface of the flange portion 52 on the image sensor side (Z2 side). Then, as shown in FIG. 12B, the connecting portion 33c of the extending portion 33A of the coil 3 is connected to the winding start portion of the winding portion 13 on the subject side (Z1 side) of the inner portion 26Bi of the lower leaf spring 26B.

As shown in FIG. 12A, the connecting plate portion 26h of the inner portion 26Bi is provided with penetrating portions 26t notched from both sides. The penetrating portion 26t is provided so that the width of the connecting plate portion 26h in the X-axis direction corresponds to the width of the protruding portion 72A in bottom view. By this arrangement, the penetrating portion 26t prevents the joining material CA from spreading along the surface of the lower leaf spring 26B on the Z2 side. Further, a tongue portion 26s is formed at a position corresponding to the surface of the protruding portion 72A on the X2 side. Due to this arrangement, the tongue portion 26s formed on the inner portion 26Bi facilitates the joining material CA to spread along the Z2 side surface of the lower leaf spring 26B to the X2 side surface of the protrusion 72A. This is to ensure that the lower leaf spring 26B and the winding portion 33m are securely connected via the joint material CA.

When the lower leaf spring 26B is assembled to the lens holding member 2, the tip of the protruding portion 72A is located on the image sensor side (Z2 side) of the inner portion 26B of the lower leaf spring 26B, as shown in FIG. 12B. As such, it protrudes downward (in the Z2 direction) from the inner portion 26Bi. A part of the winding portion 33m is also wound around the protruding portion 72A so as to be located on the image sensor side (Z2 side) of the inner portion 26Bi. In the present embodiment, in the winding portion 33m, all three winding turn portions corresponding to the third surface S3 (see FIG. 14A), which is one of the four side surfaces of the square columnar protrusion 72A, are inside. The portion 26Bi is wound around the protruding portion 72A so as to be exposed on the Z2 side. However, the winding portion 33m is wound around the protruding portion 72A so that two or one of the three winding turn portions corresponding to the third surface S3 is exposed on the Z2 side of the inner portion 26Bi. You may.

The lower leaf spring 26B and the extending portion 33A of the coil 3 are electrically and mechanically connected by a joining material other than solder, such as a conductive adhesive in which a conductive filler such as silver particles is dispersed in a synthetic resin. You may. The conductive adhesive may be a thermosetting type or an ultraviolet curable type.

The outer portion 26Be of the lower leaf spring 26B includes an outer joint portion 26d that engages with the base member 18, as shown in FIG. 11B. The outer joint portion 26d includes a first outer joint portion 26d1 and a second outer joint portion 26d2. In the present embodiment, the lower leaf spring 26B omits the connecting portion connecting the two outer joint portions 26d for miniaturization. The through hole provided in the outer joint portion 26d of the lower leaf spring 26B fits into the protruding portion 18t (see FIG. 13A) provided on the upper surface of the base member 18. As a result, the outer portion 26Be of the lower leaf spring 26B is positioned and fixed to the base member 18.

As shown in FIG. 11B, the lower leaf spring 26A and the lower leaf spring 26B are formed so as to be substantially point-symmetrical with respect to a black point representing the optical axis JD of the lens body. The lower leaf spring 26A is connected to the lens holding member 2 by two inner joint portions 26c, and is connected to the base member 18 by two outer joint portions 26d. In the present embodiment, the lower leaf spring 26A is joined to the base member 18 via the metal member 7 by welding at the first outer joint portion 26d1, and the base is joined to the base member 18 at the second outer joint portion 26d2 by a thermosetting adhesive. It is joined to the member 18. The same applies to the lower leaf spring 26B. With this configuration, the lower leaf spring 26A and the lower leaf spring 26B can support the lens holding member 2 in the air in a well-balanced manner while being movable in the direction of the optical axis JD.

Next, the fixed side member RG will be described. The fixed side member RG includes a case 4 and a magnet 5 for fixing the upper leaf spring 16, and a base member 18 for fixing each of the lower leaf spring 26A and the 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. 13A, the base member 18 is a member having a rectangular 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 projecting portions 18t protruding upward are provided. The projecting portion 18t is inserted and fitted into a through hole provided in the outer joint portion 26d of each of the lower leaf spring 26A and the lower leaf spring 26B. At this time, the projecting portion 18t is subjected to hot caulking or cold caulking and fixed to the outer joint portion 26d.

Further, the lower leaf spring 26 is fixed to the base member 18 by welding and an adhesive after the projecting portion 18t is fixed to the outer joint portion 26d by hot caulking or cold caulking. Specifically, the first outer joint portion 26d1 is fixed to the base member 18 via the metal member 7 by welding, and the second outer joint portion 26d2 is fixed to the base member 18 by a thermosetting adhesive. ..

More specifically, as shown in FIG. 11B, one through hole through which the projecting portion 18t is inserted is formed in the first outer joint portion 26d1, which is the portion where the lower leaf spring 26A is welded to the metal member 7. The second outer joint portion 26d2, to which the lower leaf spring 26A is adhered to the base member 18 with an adhesive, is formed with two through holes through which the projecting portion 18t is inserted. When only one through hole is formed in the second outer joint portion 26d2, the lower leaf spring 26A is inserted into the one through hole until the adhesive is applied or when the adhesive is peeled off. In addition, it may rotate or move in parallel around the crimped protrusion 18t. The two through holes formed in the second outer joint portion 26d2 have the effect of suppressing or preventing this rotation and translation. However, the number of through holes formed in the second outer joint portion 26d2 may be one.

As shown in FIG. 13A, a metal member 7 formed of a metal containing a material such as copper or iron or an alloy containing the same as a main component is insert-molded and embedded in the base member 18. The metal member 7 includes terminals 7A and 7B. The terminal 7A is exposed on the upper surface (Z1 side surface) of the base member 18 at the exposed portion 7A1, and the terminal 7B is exposed on the upper surface (Z1 side surface) of the base member 18 at the exposed portion 7B1. Each of the terminals 7A and 7B, which are electrically insulated from each other, is electrically connected to a conductor portion (not shown) on the substrate on which the image sensor is mounted. Further, the terminal 7A is electrically and physically connected to the lower leaf spring 26A by the exposed portion 7A1 by welding or the like, and the terminal 7B is electrically and physically connected to the lower leaf spring 26B by the exposed portion 7B1 by welding or the like. There is. Further, the lower leaf spring 26A is electrically connected to one end of the coil 3, and the lower leaf spring 26B is electrically connected to the other end of the coil 3. Therefore, the coil 3 can receive the current supply via the terminal 7A, the terminal 7B, the lower leaf spring 26A, and the lower leaf spring 26B.

Similar to the terminals 7A and 7B, the base member 18 is also insert-molded and embedded with a connecting member 7D formed of a metal containing a material such as copper or iron or an alloy containing the same as a main component. As shown in FIG. 2A, the connecting member 7D is partially exposed from the base member 18 at the lower ends of the four corners of the case 4. The base member 18 is positioned by combining the inner surface of the outer wall portion 4A of the case 4 and the side wall surface 18W of the base member 18, and then the connecting member 7D and the lower ends of the four corners of the case 4 are welded to the case 4 Is fixed to. The lower surface (end surface on the Z2 side) of the outer wall portion 4A is configured to be in contact with the upper surface (end surface on the Z1 side) of the flange portion 18F (see FIG. 13A) of the base member 18.

Next, the details of the protrusion 72 will be described with reference to FIGS. 14A, 14B, 15A and 15B. 14A and 14B are left side views of the protrusion 72A and correspond to the portion U shown in FIG. 12B. Specifically, FIG. 14A shows the state of the protruding portion 72A before the extending portion 33A is wound, and FIG. 14B shows the state of the protruding portion 72A after the extending portion 33A is wound. 15A and 15B are upward perspective views of the protrusion 72B and correspond to the portion V shown in FIG. 5A. Specifically, FIG. 15A shows the state of the protruding portion 72B before the extending portion 33B is wound, and FIG. 15B shows the state of the protruding portion 72B after the extending portion 33B is wound. Note that FIG. 15B omits the drawing of the winding portion 13 of the coil 3.

In the present embodiment, the protruding portion 72A and the protruding portion 72B are in a plane-symmetrical relationship with each other with respect to the XZ plane including the optical axis JD of the lens body. Therefore, the description of the protrusion 72A also applies to the protrusion 72B. The reverse is also true.

As shown in FIG. 14A, the protruding portion 72A is a one-dot chain line on the side where the winding portion 13 of the coil 3 is not arranged, that is, on the lower side (Z2 side) than the upper surface (Z1 side surface) of the flange portion 52. It is configured to extend diagonally downward to the left along the protruding shaft 72AX shown. The protruding shaft 72AX forms an angle θ with respect to the plane HP parallel to the XY plane shown by the broken line, for example. The angle θ is, for example, 30 degrees or more and 60 degrees or less. In this embodiment, the angle θ is 45 degrees. However, the protruding portion 72A may be configured to extend diagonally upward to the left, and a part thereof is configured to be located on the upper side (Z1 side) of the upper surface (Z1 side surface) of the flange portion 52. May be. Further, when the lens holding member 2 is viewed from the bottom surface side (Z2 side), the projecting portion 72A is not limited to the one projecting along the Y-axis direction, and may project at an angle with respect to the Y-axis. ..

The protrusion 72A is located on the central portion CP around which the extending portion 33A is wound, the root portion BP closer to the lens holding member 2 than the central portion CP, and the side farther from the lens holding member 2 than the central portion CP. It has a tip portion TP. FIG. 14A shows the root portion BP, the central portion CP, and the tip portion TP separated by a broken line.

The flat upper surface TS1 of the root portion BP is formed so as to have the same height as the upper surface TS2 of the flange portion 52 in the Z-axis direction. Specifically, as shown in FIG. 5A, the upper surface TS1 is arranged at a distance from each of the two adjacent upper surface TS2s in the flange portion 52, and is arranged in the middle of the two upper surface TS2s. Is formed in. This is to support a part of the winding portion 13 of the coil 3 together with the flange portion 52. In the present embodiment, the upper surface TS1 is formed so that the width of the coil 3 in the radial direction is about half the width of the winding portion 13 of the coil 3, but the width may be narrower. Well, it may be wider. Further, the upper surface TS1 is formed so that the length of the coil 3 in the circumferential direction is about one-fifth of the length of the corresponding eaves portion 12h, but the length may be longer. , May be shorter. With this configuration, the root portion BP of the protruding portion 72A can prevent the winding portion 13 from moving in the Z2 direction along the optical axis JD together with the flange portion 52. Further, since the root portion BP can support the winding portion 13 together with the flange portion 52, the winding shape of the coil 3 can be stabilized. That is, the root portion BP can prevent the winding shape of the coil 3 from being disturbed.

An overhanging portion 73 is formed on the tip portion TP. The overhanging portion 73 is configured to stop the winding portion 33m of the extending portion 33A from moving toward the tip portion TP side. That is, the overhanging portion 73 functions as a retaining portion for preventing the winding portion 33m from coming off from the protruding portion 72A. In the present embodiment, the overhanging portion 73 includes a first overhanging portion 73a and a second overhanging portion 73b. As shown by the arrow AR2A in FIG. 14A, the first overhanging portion 73a of the protruding portion 72A is configured to project from the first surface S1 of the central portion CP in the Y1 direction, which is an example of a direction not parallel to the protruding shaft 72AX. Has been done. The second overhanging portion 73b of the protruding portion 72A projects from the third surface S3 of the central portion CP in the Z2 direction, which is another example of the direction not parallel to the protruding shaft 72AX, as shown by the arrow AR3A in FIG. 14A. It is configured in. In this example, the first overhanging portion 73a is formed so as to project perpendicularly to the overhanging direction of the second overhanging portion 73b.

Similarly, the first overhanging portion 73a of the protruding portion 72B is configured to project from the first surface S1 of the central portion CP in the Y2 direction, as shown by the arrow AR2B in FIG. 15A. The second overhanging portion 73b of the protruding portion 72B is configured to project in the Z2 direction from the third surface S3 of the central portion CP, as shown by the arrow AR3B in FIG. 15A. In this example, also in the projecting portion 72B, the first overhanging portion 73a is formed so as to project perpendicularly to the projecting direction of the second overhanging portion 73b.

As shown by the arrow AR4 in FIG. 15A, the overhanging portion 73 includes a third overhanging portion 73c that projects in the X1 direction so as to divide the second surface S2 of the central portion CP into the first portion S2a and the second portion S2b. .. Similarly, the overhanging portion 73 includes a fourth overhanging portion 73d that projects in the X2 direction so as to divide the fourth surface S4 of the central portion CP into two, as shown by the arrow AR5 in FIG. 15A.

The first overhanging portion 73a, the third overhanging portion 73c, and the fourth overhanging portion 73d are formed by utilizing a parting surface which is a dividing surface of a mold used when molding the lens holding member 2. However, the third overhanging portion 73c and the fourth overhanging portion 73d may be omitted. That is, both the protruding portion 72A and the protruding portion 72B may be formed so that the first portion S2a and the second portion S2b on the second surface S2 of the central portion CP are flush with each other. The same applies to the fourth surface S4.

With this configuration, the first overhanging portion 73a and the second overhanging portion 73b of the protruding portion 72A that project perpendicularly to each other cooperate with each other so that the winding portion 33m of the extending portion 33A is on the tip portion TP side along the protruding shaft 72AX. You can more reliably stop moving to. The same applies to the protruding portion 72B. Further, the first overhanging portion 73a is formed so as to project along the direction perpendicular to the die pulling direction, and the second overhanging portion 73b is formed so as to project along the die pulling direction. Has been done. That is, the overhanging portion 73 is formed so that undercut does not occur. Therefore, this configuration does not overly complicate the structure of the mold. The same applies to the protruding portion 72B.

The length of the central portion CP of the protruding portion 72A is determined along the protruding shaft 72AX so that the extending portion 33A is wound with a predetermined number of winding turns. In this embodiment, the central portion CP has a length at which the wire is wound in at least 3 turns, as shown in FIG. 14B. Therefore, the axis (center line) of the winding portion 33m of the extending portion 33A, which is the portion where the wire rod is wound around the protruding portion 72A in a plurality of turns, coincides with the protruding shaft 72AX. Therefore, the straight line along the axis of the winding portion 33m is a predetermined angle (for example, an angle of 30 degrees or more and 60 degrees or less) with respect to the straight line along the axis (optical axis JD) of the winding portion 13 of the coil 3. It is tilted at. The same applies to the winding portion 33m of the extending portion 33B.

The lens holding member 2 is preferably configured so that a predetermined empty space is formed around the protrusion 72A. For example, the lens holding member 2 is formed so that no object exists in a predetermined range around the protrusion 72A so as to secure a working space for the winding nozzle of the automatic winding machine. The space SP shown by the broken line in FIG. 14B is an example of the working space of the winding nozzle. In the present embodiment, the space SP is a columnar space centered on the protruding shaft 72AX. This is because the automatic winding machine winds the wire rod around the protrusion 72A while rotating the winding nozzle around the protrusion shaft 72AX. Specifically, as shown in FIG. 14B, the lens holding member 2 has a shape and dimensions so that objects such as the winding portion 13, the projecting portion 2t, and the flange portion 52 of the coil 3 are not arranged in the space SP. Has been decided. This is because if an object is arranged in the space SP, the object and the winding nozzle come into contact with each other when the wire rod is wound around the protrusion 72A by the automatic winding machine.

Next, with reference to FIGS. 16A to 16C, the effect of the protruding portion 72 formed on the lens holding member 2 constituting the lens driving device 101 according to the embodiment of the present invention will be described. 16A to 16C are left side views of the three types of protrusions. Specifically, FIG. 16A is a left side view of the protruding portion 172 formed on the lens holding member 102 as a reference example. FIG. 16B is a left side view of the protrusion 272 formed on the lens holding member 202 as another reference example. FIG. 16C is a left side view of the protrusion 72A formed on the lens holding member 2 according to the embodiment of the present invention, and corresponds to FIG. 14B. For comparison, the winding portions 33m in the protruding portion 72A, the protruding portion 172, and the protruding portion 272 are formed so that the number of winding turns and the winding diameter are the same.

As shown in FIG. 16A, the projecting portion 172 formed on the lens holding member 102 as a reference example is formed so as to project from the lower surface of the flange portion 52 along the projecting shaft 172X in the Z2 direction. The reason for projecting the protruding portion 172 is, for example, to allow the wire rod constituting the coil 3 to be wound around the protruding portion 172 for 3 turns, so that the joint between the lower leaf spring 26 and the winding portion 33 m is realized by the joining material CA. This is to prevent the object from being placed in the space SP, which is the working space of the winding nozzle. Further, the reason is also that, preferably, an overhanging portion is arranged to prevent the wire rod wound around the protruding portion 172 from falling out of the protruding portion 172. Therefore, the protruding height of the protruding portion 172 in the Z2 direction is the height Hr. If the protruding height of the protruding portion 172 in the Z2 direction is large, the height of the lens holding member 2 in the Z-axis direction also increases, and eventually the height of the lens driving device 101 in the Z-axis direction also increases. That is, the large protrusion height of the protruding portion 172 in the Z2 direction hinders the miniaturization or reduction of the height of the lens driving device 101.

As another reference example, the projecting portion 272 formed on the lens holding member 202 is formed so as to project from the side surface of the flange portion 52 in the Y1 direction along the projecting shaft 272X, as shown in FIG. 16B. The reason for projecting the projecting portion 272 is the same as in the case of FIG. 16A. Further, the reason is also, preferably, so that the overhanging portion is arranged. Therefore, the protruding width of the protruding portion 272 from the end surface of the winding portion 13 in the Y1 direction is the width Wr. If the protruding width of the protruding portion 272 in the Y1 direction is large, the width of the lens holding member 2 in the Y-axis direction is also large, and the width of the lens driving device 101 in the Y-axis direction is also large. That is, the large protrusion width of the protruding portion 272 in the Y1 direction hinders the miniaturization of the lens driving device 101 or the increase in the lens diameter.

On the other hand, as shown in FIG. 16C, the protruding portion 72A formed on the lens holding member 2 according to the embodiment of the present invention is formed so as to project diagonally outward from the flange portion 52 along the protruding shaft 72AX. Has been done. The reason for projecting the projecting portion 72A is the same as in the case of FIGS. 16A and 16B. Further, the reason is also, preferably, so that the overhanging portion is arranged. Therefore, the protruding height of the protruding portion 72A in the Z2 direction is the height Ht. However, the height Ht is smaller than the height Hr (see also FIG. 16A) by ΔH. Further, the protrusion width of the protrusion 72A from the end surface of the winding portion 13 in the Y1 direction is the width Wt. However, the width Wt is smaller than the width Wr (see also FIG. 16B) by ΔW.

As described above, in the lens driving device 101 according to the embodiment of the present invention, the protruding portion 72 is configured to project diagonally outward, not in a direction parallel to or perpendicular to the optical axis JD. Therefore, the protrusion 72 can adjust the protrusion width in the Y-axis direction and the protrusion height in the Z-axis direction in a well-balanced manner while securing the space SP. As a result, the protruding portion 72 enables the wire rod to be wound around the protruding portion 72 by the automatic winding machine, and suppresses the increase in the dimension of the lens holding member 2 in the direction perpendicular to the optical axis JD, while suppressing the increase in the dimension of the lens holding member 2. The dimension in the direction of the optical axis JD of 2 can be reduced. As a result, the protruding portion 72 can contribute to the miniaturization of the lens driving device 101.

As described above, in the lens driving device 101 according to the embodiment of the present invention, the fixed side member RG, the lens holding member 2 capable of holding the lens body, and the lens holding member 2 can be moved in the direction of the optical axis JD. It includes a leaf spring 6 that supports it, a coil 3 that is held by the lens holding member 2, and a magnet 5 that faces the coil 3. The leaf spring 6 includes an upper leaf spring 16 and a lower leaf spring 26. The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B. The upper leaf spring 16 includes an outer portion 16e as a fixed side support portion fixed to the case 4 as a fixed side member RG, and an inner portion 16i as a movable side support portion fixed to the lens holding member 2. ing. Each of the lower leaf spring 26A and the lower leaf spring 26B has an outer portion 26e as a fixed side support portion fixed to the base member 18 as a fixed side member RG and a movable side support portion fixed to the lens holding member 2. The inner portion 26i of the lens is provided. The coil 3 has a winding portion 13 held by the lens holding member 2 and an extending portion 33 connected to the winding portion 13. The extending portion 33 is electrically connected to the lower leaf spring 26. The lens holding member 2 has a protruding portion 72 around which the extending portion 33 is wound. The protruding portion 72 projects diagonally outward with respect to the optical axis JD. The above configuration has the effect of suppressing the amount of protrusion of the protruding portion 72 in the direction of the optical axis JD, and thus has the effect of further reducing the size (lowering of the height) of the lens driving device 101.

Further, the configuration in which the protruding portion 72 extends diagonally outward is in the work space of the winding nozzle as compared with the configuration in which the protruding portion extends in the direction parallel to or perpendicular to the optical axis JD as shown in FIGS. 16A or 16B. It has the advantage that it is easy to secure a certain space SP. Therefore, the above configuration allows the protrusion amount of the protrusion 72 in the direction of the optical axis JD without adversely affecting other functional parts of the lens holding member 2 such as the protrusion 2t, the coil support portion 12j, and the flange portion 52. It has the effect of being able to be suppressed.

An overhanging portion 73 may be formed on the tip portion TP of the protruding portion 72. In this case, the extending portion 33 is wound closer to the root portion BP of the protruding portion 72 than the overhanging portion 73. Specifically, as shown in FIGS. 14B and 15B, the extending portion 33 is closer to the root portion BP of the protruding portion 72 than the overhanging portion 73 (first overhanging portion 73a and second overhanging portion 73b). Wrapped around a central CP. This configuration has the effect of preventing the wire rod wound around the protrusion 72 from falling out of the protrusion 72.

A first overhanging portion 73a and a second overhanging portion 73b may be formed on the tip portion TP of the protruding portion 72. In this case, the first overhanging portion 73a may overhang vertically in the overhanging direction of the second overhanging portion 73b. This configuration has the effect that the wire rod wound around the projecting portion 72 can be more reliably prevented from falling out of the projecting portion 72 by the cooperation of the two overhanging portions. Further, the structure in which both of the two overhanging portions project in the die withdrawal direction or in the direction perpendicular to the die withdrawal direction has an effect that the structure of the mold can be made relatively simple.

The lens holding member 2 may have a flange portion 52 as a regulating portion that regulates the movement of the winding portion 13 in the direction of the optical axis JD. In this case, the protruding portion 72 may form a part of the flange portion 52. For example, as shown in FIG. 15A, the flat upper surface TS1 of the root portion BP constituting the protruding portion 72B supports the winding portion 13 of the coil 3 together with the upper surface TS2 of the flange portion 52 (see FIG. 5A). It may be configured in. With this configuration, the protruding portion 72 can prevent the winding portion 13 from moving in the Z2 direction along the optical axis together with the flange portion 52. Further, since the protruding portion 72 can support the winding portion 13 together with the flange portion 52, the winding shape of the coil 3 can be stabilized. That is, the protruding portion 72 can prevent the winding shape of the coil 3 from being disturbed.

The projecting portion 72 preferably projects at an angle θ of 30 degrees or more and 60 degrees or less with respect to a plane perpendicular to the optical axis JD. In this case, the lens holding member 2 can adjust the protrusion width in the Y-axis direction and the protrusion height in the Z-axis direction in a well-balanced manner, for example, while securing the space SP which is the working space of the winding nozzle. Therefore, this configuration enables the wire rod to be wound around the protruding portion 72 by the automatic winding machine, and suppresses the increase in the dimension of the lens holding member 2 in the direction perpendicular to the optical axis JD, while suppressing the increase in the dimension of the lens holding member 2. The dimension in the direction of the optical axis JD can be reduced. As a result, this configuration can contribute to the miniaturization of the lens driving device 101.

The protrusion 72 may include a first protrusion 72A around which one end of the coil 3 is wound and a second protrusion 72B around which the other end of the coil 3 is wound. In this case, the first protruding portion 72A and the second protruding portion 72B may be arranged at positions facing each other with the optical axis JD of the lens body interposed therebetween, and may be configured to project in a direction away from each other. .. For example, as shown in FIG. 6A, the protrusion 72A is arranged on the Y1 side with respect to the optical axis JD, and the protrusion 72B is arranged on the Y2 side with respect to the optical axis JD. The protruding portion 72A and the protruding portion 72B are in a plane-symmetrical relationship with each other with respect to the XZ plane including the optical axis JD. Further, the projecting portion 72A and the projecting portion 72B are configured to project in a direction away from each other in the bottom view as shown by the arrow AR1 in FIG. 6A. This configuration has the effect that when the wire rod is wound around one of the protrusions 72A and 72B, the other does not get in the way.

The fixed side member RG may include a rectangular box-shaped case 4 having a first side plate portion 4A1 as a pair of side plate portions and a second side plate portion 4A2 as another pair of side plate portions. For example, as shown in FIG. 10A, the first protruding portion 72A is arranged so as to face one of the second side plate portions 4A2, and the second protruding portion 72B is of the second side plate portion 4A2. It may be arranged so as to face the other. Alternatively, the first protruding portion 72A is arranged so as to face one of the first side plate portions 4A1, and the second protruding portion 72B is arranged so as to face the other of the first side plate portions 4A1. It may have been done. The magnet 5 may be arranged so as to face the corner of the case 4. For example, as shown in FIG. 10B, each of the four magnets 5 may be arranged so as to face each of the four corners of the case 4. This configuration brings about an improvement in the space efficiency inside the case 4, and thus brings about a further miniaturization of the lens driving device 101.

Next, the details of the upper leaf spring 16 will be described with reference to FIG. FIG. 17 is a top view of the upper leaf spring 16 and corresponds to FIG. 11A.

The upper leaf spring 16 has two elastic arm portions 16g connecting the inner portion 16i and the outer portion 16e. The two elastic arm portions 16g are a first elastic arm portion 16g1 and a second elastic arm portion 16g2.

In the present embodiment, the first elastic arm portion 16g1 has a three-branched shape. Specifically, the first elastic arm portion 16g1 includes a branch portion BF, a first arm portion AM1 extending from the branch portion BF to the first end portion TA1, and a second arm portion AM2 extending from the branch portion BF to the second end portion TA2. And has a third arm AM3 extending from the bifurcation BF to the third end TA3. The same applies to the second elastic arm portion 16g2. In FIG. 17, for convenience, the positions of the branch portion BF, the first end portion TA1, the second end portion TA2, the third end portion TA3, and the optical axis JD are indicated by black circles.

The first end TA1 with respect to the first elastic arm 16g1 is connected to the upper right corner portion 16bTR, which is one of the four corner portions 16b constituting the outer portion 16e. The first end TA1 with respect to the second elastic arm 16g2 is connected to the lower left corner portion 16bBL, which is another one of the four corner portions 16b.

The second end TA2 with respect to the first elastic arm portion 16g1 is connected to the left inner joint portion 16cL, which is one of the two inner joint portions 16c constituting the inner portion 16i. The second end TA2 with respect to the second elastic arm 16g2 is connected to the right medial joint 16cR, which is another one of the two inner joints 16c.

The third end TA3 with respect to the first elastic arm 16g1 is connected to the right medial joint 16cR. The third end TA3 with respect to the second elastic arm 16g2 is connected to the left medial joint 16cL.

The lower right corner portion 16bBR and the upper left corner portion 16bTL, which are two of the four corner portions 16b constituting the outer portion 16e, are not connected to any of the first elastic arm portion 16g1 and the second elastic arm portion 16g2.

With respect to the first elastic arm portion 16g1, an angle α is formed between the line segment L0 connecting the optical axis JD and the branch portion BF and the line segment L1 connecting the optical axis JD and the first end portion TA1. Similarly, an angle β is formed between the line segment L2 connecting the optical axis JD and the second end TA2 and the line segment L0, and the line segment L3 and the line segment L0 connecting the optical axis JD and the third end TA3 are formed. An angle γ is formed between the two. The maximum value of the angle formed between any two of the four line segments L0 to L3 is the angle δ (= β + γ) formed between the line segment L2 and the line segment L3. The same applies to the second elastic arm portion 16g2.

As described above, in the present embodiment, the elastic arm portion 16g is configured so that the angle δ is larger than the angle β. That is, the first arm portion AM1 and the second arm portion AM2 extend from the branch portion BF in the first circumferential direction (counterclockwise direction) of the circle centered on the optical axis JD. The third arm AM3 is configured to extend in the opposite second circumferential direction (clockwise direction). Further, the second arm AM2 is configured to be longer than the first arm AM1. With this configuration, the elastic arm portion 16g can realize an appropriate spring rigidity in a direction perpendicular to the optical axis JD while realizing an appropriate spring constant in the direction of the optical axis JD. The appropriate spring constant is determined according to the thrust generated by the drive mechanism MK, the weight of the movable side member such as the lens holding member 2 and the coil 3, and the like.

Next, the details of the lower leaf spring 26 will be described with reference to FIG. FIG. 18 is a bottom view of the lower leaf spring 26 and corresponds to FIG. 11B.

The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B. The lower leaf spring 26A has an elastic arm portion 26Ag that connects the inner portion 26Ai, the first outer joint portion 26d1 that constitutes the outer portion 26Ae, and the second outer joint portion 26d2 that constitutes the outer portion 26Ae. The lower leaf spring 26B has an elastic arm portion 26Bg that connects the inner portion 26Bi, the first outer joint portion 26d1 that constitutes the outer portion 26Be, and the second outer joint portion 26d2 that constitutes the outer portion 26Be.

In the present embodiment, the elastic arm portion 26Ag of the lower leaf spring 26A has a three-branch shape. Specifically, the elastic arm portion 26Ag includes a branch portion BF, a first arm portion AM1 extending from the branch portion BF to the first end portion TA1, a second arm portion AM2 extending from the branch portion BF to the second end portion TA2, and the like. , Has a third arm AM3 extending from the bifurcation BF to the third end TA3. The same applies to the elastic arm portion 26Bg of the lower leaf spring 26B. In FIG. 18, for convenience, the positions of the branch portion BF, the first end portion TA1, the second end portion TA2, the third end portion TA3, and the optical axis JD are indicated by black circles.

The first end TA1 with respect to the elastic arm 26Ag is connected to the first outer joint 26d1 constituting the outer 26Ae. The first end TA1 with respect to the elastic arm portion 26Bg is connected to the second outer joint portion 26d2 constituting the outer portion 26Be.

The second end TA2 with respect to the elastic arm 26Ag is connected to the inner portion 26Ai. The second end TA2 with respect to the elastic arm 26Bg is connected to the inner portion 26Bi.

The third end TA3 with respect to the elastic arm portion 26Ag is connected to the second outer joint portion 26d2 constituting the outer portion 26Ae. The third end TA3 with respect to the elastic arm portion 26Bg is connected to the first outer joint portion 26d1 constituting the outer portion 26Be.

With respect to the elastic arm portion 26Ag, an angle α is formed between the line segment L0 connecting the optical axis JD and the branch portion BF and the line segment L1 connecting the optical axis JD and the first end portion TA1. Similarly, an angle β is formed between the line segment L2 connecting the optical axis JD and the second end TA2 and the line segment L0, and the line segment L3 and the line segment L0 connecting the optical axis JD and the third end TA3 are formed. An angle γ is formed between the two. The maximum value of the angle formed between any two of the four line segments L0 to L3 is the angle δ (= β + γ) formed between the line segment L2 and the line segment L3. The same applies to the elastic arm portion 26 Bg.

As described above, in the present embodiment, the elastic arm portion 26g is configured such that the angle δ is larger than the angle β. That is, the first arm portion AM1 and the second arm portion AM2 extend from the branch portion BF in the first circumferential direction of the circle centered on the optical axis JD, and the second circumferential direction opposite to the first circumferential direction from the branch portion BF. The third arm AM3 is configured to extend. Further, the second arm AM2 is configured to be longer than the first arm AM1. With this configuration, the elastic arm portion 26g can realize an appropriate spring rigidity in a direction perpendicular to the optical axis JD while realizing an appropriate spring constant in the direction of the optical axis JD.

As described above, in the lens driving device 101 according to the embodiment of the present invention, the fixed side member RG, the lens holding member 2 capable of holding the lens body, and the lens holding member 2 can be moved in the direction of the optical axis JD. It includes a leaf spring 6 that supports it, a coil 3 that is held by the lens holding member 2, and a magnet 5 that faces the coil 3. The leaf spring 6 includes an upper leaf spring 16 arranged on the upper side (Z1 side) of the lens holding member 2 and a lower leaf spring 26 arranged on the lower side (Z2 side) of the lens holding member 2. At least one of the upper leaf spring 16 and the lower leaf spring 26 connects the fixed side member RG and the lens holding member 2 with two elastic arms. For example, the upper leaf spring 16 may connect the case 4 as the fixed side member RG and the lens holding member 2 with the first elastic arm portion 16g1 and the second elastic arm portion 16g2. Specifically, as shown in FIG. 17, the inner portion 16i and the outer portion 16e may be connected by the first elastic arm portion 16g1 and the second elastic arm portion 16g2. Further, the lower leaf spring 26 connects the base member 18 as the fixed side member RG and the lens holding member 2 with the elastic arm portion 26Ag of the lower leaf spring 26A and the elastic arm portion 26Bg of the lower leaf spring 26B. May be good. Specifically, as shown in FIG. 18, the inner portion 26Ai of the lower leaf spring 26A and the two outer portions 26Ae of the lower leaf spring 26A are connected by the elastic arm portion 26Ag, and the inner portion 26Bi of the lower leaf spring 26B is connected. And the two outer portions 26Be of the lower leaf spring 26B may be connected by the elastic arm portion 26Bg.

Due to the configuration in which the fixed side member RG and the lens holding member 2 are connected by two elastic arms, the lens driving device 101 can use the two elastic arms as compared with the case where the number of elastic arms is three or more. Can be lengthened. This is because it is easy to secure a space for accommodating the elastic arm portion. As a result, the lens drive device 101 is a suitable spring even when it is miniaturized, that is, when it is not possible to secure a space for accommodating three or more elastic arms having a desired length. A constant can be realized. This means that miniaturization can be achieved appropriately. Specifically, when the weight of the movable side member such as the lens holding member 2 and the coil 3 is reduced, or when the driving force (thrust) that can be generated by the drive mechanism MK is reduced due to the miniaturization of the magnet 5. The spring constant can be appropriately reduced. The spring constant includes a spring constant related to the direction of the optical axis JD and a spring constant related to the direction perpendicular to the optical axis JD.

The first elastic arm portion 16g1 includes a first end portion TA1 connected to the case 4 as a fixed side member RG via an outer portion 16e, and a second end portion TA2 connected to a lens holding member 2 via an inner portion 16i. It may be configured to have a third end portion TA3 connected to the lens holding member 2 via the inner portion 16i. Specifically, as shown in FIG. 17, the first elastic arm portion 16g1 has a first end TA1 connected to the upper right corner portion 16bTR, a second end TA2 connected to the left inner joining portion 16cL, and a right inner joining. It may be configured to have a third end TA3 connected to the portion 16cR.

The second elastic arm portion 16g2 includes a first end portion TA1 connected to the case 4 as the fixed side member RG via the outer portion 16e, and a second end portion TA2 connected to the lens holding member 2 via the inner portion 16i. It may be configured to have a third end portion TA3 connected to the lens holding member 2 via the inner portion 16i. Specifically, as shown in FIG. 17, the second elastic arm portion 16g2 has a first end TA1 connected to the lower left corner portion 16bBL, a second end TA2 connected to the right inner joining portion 16cR, and a left inner joining. It may be configured to have a third end TA3 connected to the portion 16 cL.

The elastic arm portion 26Ag has a first end portion TA1 connected to the base member 18 as the fixed side member RG, a second end portion TA2 connected to the lens holding member 2, and a third end portion TA3 connected to the base member 18. It may be configured as follows. Specifically, as shown in FIG. 18, the elastic arm portion 26Ag has a first end portion TA1 connected to the first outer joint portion 26d1, a second end portion TA2 connected to the inner joint portion 26c, and a second outer joint. It may be configured to have a third end TA3 connected to the portion 26d2.

The elastic arm portion 26Bg has a first end portion TA1 connected to the base member 18 as the fixed side member RG, a second end portion TA2 connected to the lens holding member 2, and a third end portion TA3 connected to the base member 18. It may be configured as follows. Specifically, as shown in FIG. 18, the elastic arm portion 26Bg includes a first end portion TA1 connected to the second outer joint portion 26d2, a second end portion TA2 connected to the inner joint portion 26c, and a first outer joint. It may be configured to have a third end TA3 connected to the portion 26d1.

The lower leaf spring 26 may be formed of a conductive member and may be divided into a lower leaf spring 26A as a first spring portion and a lower leaf spring 26B as a second spring portion. In this case, the lower leaf spring 26A may be electrically connected to one end of the coil 3, and the lower leaf spring 26B may be electrically connected to the other end of the coil 3. Specifically, as shown in FIG. 18, the lower leaf spring 26A is welded to the metal member 7 at the first outer joining portion 26d1 and joined to the coil 3 through the joining material CA at the connecting plate portion 26h of the inner portion 26Ai. ing. Therefore, the current flowing from the terminal 7A to the terminal 7B passes through, for example, the first end TA1, the first arm AM1, the branch BF, the second arm AM2, and the second end TA2 from the metal member 7, and the coil 3 Flow to. Further, as shown in FIG. 18, the lower leaf spring 26B is welded to the metal member 7 at the first outer joint portion 26d1 and is joined to the coil 3 through the joining material CA at the connecting plate portion 26h of the inner portion 26Bi. Therefore, the current flowing from the terminal 7A to the terminal 7B passes through, for example, the second end TA2, the second arm AM2, the branch BF, the third arm AM3, and the third end TA3 from the coil 3, and the metal member 7 Flow to. With this configuration, the lens driving device 101 can easily form an energization path from the metal member 7 to the coil 3.

The elastic arm portion 16g includes, for example, a branch portion BF, a first arm portion AM1 extending from the branch portion BF and connected to the case 4 as a fixed side member RG via an outer portion 16e, and a first arm portion AM1 from the branch portion BF. The second arm AM2 extending in the same direction as the above (for example, the counterclockwise direction in FIG. 17) and connecting to the lens holding member 2 via the inner portion 16i, and the first arm AM1 and the second arm AM2 from the branch BF. May have a third arm AM3 that extends in a different direction (eg, clockwise in FIG. 17). In this case, the third arm AM3 is connected to the case 4 via the outer portion 16e when the first arm AM1 is longer than the second arm AM2, and when the first arm AM1 is shorter than the second arm AM2. It may be configured to be connected to the lens holding member 2 via the inner portion 16i. For example, as shown in FIG. 17, when the first arm AM1 is shorter than the second arm AM2, the third arm AM3 may be configured to be connected to the lens holding member 2 via the inner portion 16i. .. In this case, the rigidity of the second arm AM2 becomes lower in the lateral direction (Y-axis direction). However, since the third arm AM3 extending in the Y-axis direction is connected to the lens holding member 2, the decrease in rigidity in the lateral direction (Y-axis direction) due to the second arm AM2 is due to the rigidity due to the third arm AM3. Supplemented by. With this configuration, the elastic arm portion 16g can achieve a desired rigidity. As a result, the higher-order resonance frequency can be increased. Further, it is possible to prevent the lens holding member 2 from moving excessively in the direction perpendicular to the optical axis JD.

The fixed side member RG may include a rectangular box-shaped case 4 having a first side plate portion 4A1 and a second side plate portion 4A2 perpendicular to the first side plate portion 4A1. In this case, the elastic arm portion may have a portion facing at least one of the first side plate portion 4A1 and the second side plate portion 4A2.

For example, the first elastic arm portion 16g1 and the second elastic arm portion 16g2 in the upper leaf spring 16 both have a third arm portion AM3 and a third arm portion AM3 which are portions facing the first side plate portion 4A1 as shown in FIG. It may have a second arm portion AM2 which is a portion facing the two side plate portion 4A2. As described above, since the elastic arm portion 16g includes portions facing each of the first side plate portion 4A1 and the second side plate portion 4A2 that are substantially orthogonal to each other, the directions perpendicular to the optical axis (X-axis direction and Y-axis direction). ) Can be increased in rigidity.

Further, as shown in FIG. 18, the elastic arm portion 26Ag of the lower leaf spring 26A and the elastic arm portion 26Bg of the lower leaf spring 26B are both the first arm portion AM1 and the first arm portion AM1 and the portion facing the first side plate portion 4A1. It may have three arms AM3. As described above, since the elastic arm portion 26g includes a portion facing the first side plate portion 4A1, the rigidity in the Y-axis direction can be increased.

The elastic arm portion 26g is connected to, for example, a branch portion BF, a first end portion TA1 connected to a base member 18 as a fixed side member RG via an outer portion 26e, and a lens holding member 2 via an inner portion 26i. It may be configured to have a two-end TA2 and a third-end TA3 connected to the base member 18 or the lens holding member 2. In this case, the line segment L0 connecting the optical axis JD of the lens body and the branch portion BF, and the line segments L1 and L2 connecting the optical axis JD with the first end TA1, the second end TA2, or the third end TA3. Alternatively, the maximum value of the angle around the optical axis JD formed by L3 is preferably the optical axis JD and two of the first end TA1, the second end TA2, and the third end TA3, respectively. It is smaller than the maximum value of the angle around the optical axis JD formed by the two line segments connecting. For example, as shown in FIG. 18, a line segment L0 connecting the optical axis JD of the lens body and the branch portion BF, and the optical axis JD and the first end TA1, the second end TA2, and the third end TA3, respectively. The angles α, β, and γ formed by each of the three line segments L1 to L3 connecting the two are the optical axis JD and the first end TA1, the second end TA2, and the third end TA3. It is smaller than the angle δ, which is the maximum value of the angle formed by the two line segments connecting each of the two lines. With this configuration, the elastic arm portion 26g can realize an appropriate spring rigidity in a direction perpendicular to the optical axis JD while realizing an appropriate spring constant in the direction of the optical axis JD.

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

For example, in the above embodiment, the lens holding member 2 is supported by the fixed side member RG via an upper leaf spring 16 having two elastic arm portions 16 g and a lower leaf spring 26 having two elastic arm portions 26 g. ing. However, even if the lens holding member 2 is supported by the fixed side member RG via the upper leaf spring 16 having three or more elastic arm portions 16 g and the lower leaf spring 26 having two elastic arm portions 26 g. Good. Alternatively, the lens holding member 2 may be supported by the fixed side member RG via an upper leaf spring 16 having two elastic arm portions 16 g and a lower leaf spring 26 having three or more elastic arm portions 26 g. Good.

Further, in the above embodiment, the lower leaf spring 26A and the extending portion 33B are electrically connected, and the lower leaf spring 26B and the extending portion 33A are electrically connected. Is not limited to this configuration. For example, in a lens drive device with an image stabilization function, the upper leaf spring 16 is divided into two, one is electrically connected to the coil winding start portion, and the other is electrically connected to the coil winding end portion. It may be configured to be connected. The lens driving device with the image stabilization function has a magnet holder for holding the magnet 5. Unlike the lens holding member 2 as a movable side member that moves in the direction of the optical axis JD, the magnet holder constitutes a fixed side member that does not move in the direction of the optical axis JD.

This application claims priority based on Japanese Patent Application No. 2018-056826 filed on March 23, 2018, and the entire contents of this Japanese patent application are incorporated herein by reference.

2 ... Lens holding member 2t ... Protruding part 3 ... Coil 4 ... Case 4A ... Outer wall part 4A1 ... First side plate part 4A2 ... Second side plate part 4B ... Top surface 4R ... Receiving part 4s ... Storage part 5 ... Magnet 6 ... Leaf spring 7 ... Metal member 7A, 7B ... Terminal 7D ... Connecting member 7A1, 7B1 ... 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 part 16i ・ ・ ・ Inner part 16r ・ ・ ・ Crosspiece 18 ・ ・ ・ Base member 18F ・ ・ ・ Flange part 18k ・ ・ ・ Opening 18t ・ ・ ・ Protrusion Installation part 18W ・ ・ ・ Side wall surface 26, 26A, 26B ・ ・ ・ 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 ・ ・ ・ First connection part 26t ・ ・ ・ Penetration part 33, 33A, 33B ・ ・ ・ Extension part 33c ・ ・ ・ Connection part 33m ・ ・ ・ Winding part 52 ・ ・ ・Flange parts 72, 72A, 72B ・ ・ ・ Protruding parts 101 ・ ・ ・ Lens drive device CA ・ ・ ・ Joint material JD ・ ・ ・ Optical axis MK ・ ・ ・ Drive mechanism RG ・ ・ ・ Fixed side member

Claims (6)

Fixed side member and
A lens holding member that can hold the lens body and
A leaf spring that movably supports the lens holding member in the direction of the optical axis,
The coil held by the lens holding member and
A lens driving device including a magnet facing the coil.
The leaf spring includes an upper leaf spring arranged above the lens holding member and a lower leaf spring arranged below the lens holding member.
At least one of the upper leaf spring and the lower leaf spring connects the fixed side member and the lens holding member with two elastic arms .
The elastic arm portion has a first end portion connected to the fixed side member, a second end portion connected to the lens holding member, and a third end portion connected to the fixed side member or the lens holding member .
Lens drive device. The lower leaf spring is formed of a conductive member and is divided into a first spring portion and a second spring portion.
The first spring portion is electrically connected to one end of the coil.
The second spring portion is electrically connected to the other end of the coil.
The lens driving device according to claim 1. The elastic arm is
Branch and
A first arm portion extending from the branch portion and connected to the fixed side member,
A second arm portion extending from the branch portion and connected to the lens holding member,
It has a third arm portion extending from the branch portion and
The third arm is
When the first arm portion is longer than the second arm portion, it is connected to the fixed side member and
It is configured to be connected to the lens holding member when the first arm portion is shorter than the second arm portion.
The lens driving device according to claim 1 or 2. The fixed side member includes a rectangular box-shaped case having a first side plate portion and a second side plate portion perpendicular to the first side plate portion.
The elastic arm portion has a portion facing at least one of the first side plate portion and the second side plate portion.
The lens driving device according to any one of claims 1 to 3. The elastic arm portion includes a branch portion, a first end portion connected to the fixed side member, a second end portion connected to the lens holding member, and a third end portion connected to the fixed side member or the lens holding member. Have,
An optical axis formed by a line segment connecting the optical axis of the lens body and the branch portion and a line segment connecting the optical axis with the first end portion, the second end portion, or the third end portion. The maximum value of the rotation angle is smaller than the maximum value of the angle around the optical axis formed by the optical axis and the first end portion, the second end portion, and the third end portion.
The lens driving device according to any one of claims 1 to 4. The lens driving device according to any one of claims 1 to 5.
With the lens body
It has an image sensor facing the lens body, and has the image sensor.
The camera module.

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