JP6700588B2 - Lens drive - Google Patents

Description

   The present invention relates to a lens driving device that is suitable for use in, for example, a camera module of a mobile phone.

   In a lens driving device suitably used for a camera module of a mobile phone, a device has been developed for moving an image stabilization movable part including a lens holder for holding a lens in a direction perpendicular to an optical axis for image stabilization. ..

   In the conventional device, the resonance of the moving part for shake correction is a problem. Therefore, it has been proposed to dispose unnecessary dampers by disposing a damper material between the shake correction movable portion and the coil substrate (Patent Document 1).

   In the conventional device, a damper material is arranged between the fixed part and the shake compensation movable part that moves in the direction perpendicular to the optical axis to suppress resonance in the shake compensation movable part in the direction perpendicular to the optical axis. To do is considered.

   However, in the conventional device, if the amount of the damper material filled between the shake correcting movable portion and the fixed portion is too large, the responsiveness of the shake correcting operation may deteriorate. Further, even if the amount of the damper material is properly controlled, there is a possibility that a resonance point may occur due to the frequency characteristic of AF driving. That is, it is difficult to effectively prevent the movable portion from vibrating in the optical axis direction.

   As disclosed in Patent Document 2, there is also known an invention in which a vibration absorbing member is arranged so as to come into contact with a suspension wire supporting a movable portion, but suppressing resonance in a direction perpendicular to the optical axis of the movable portion. However, it is difficult to effectively prevent the movable portion from vibrating in the optical axis direction.

JP, 2013-44924, A JP, 2013-210550, A

   The present invention has been made in view of such an actual situation, and an object thereof is to provide a lens driving device capable of effectively preventing the movable portion from vibrating in the optical axis direction.

In order to achieve the above object, the lens driving device according to the present invention comprises:
A lens holder capable of holding at least one lens,
An elastic member that holds the lens holder along the optical axis of the lens so as to be movable relative to the frame,
An optical axis direction drive unit that moves the lens holder relative to the frame along the optical axis;
A support part that connects the elastic member and the fixing part so as to movably support the frame along a direction intersecting the optical axis,
A lens driving device comprising: a cross direction driving unit that moves the frame with respect to the fixed unit along a direction intersecting the optical axis.
The elastic member is
A holder mounting portion mounted on the lens holder,
A frame attachment part attached to the frame;
A support attachment portion attached to the support portion,
A gap is formed between a part of the elastic member located between the frame attachment portion and the support attachment portion and the frame,
A vibration absorbing member is arranged in the gap.

   In the lens driving device according to the present invention, a gap is formed between the frame and a part of the elastic member located between the frame attachment portion and the support attachment portion, and the vibration absorbing member is arranged in the gap. I am doing it. Therefore, it is possible to effectively prevent the elastic member and the vibration absorbing member from working together to vibrate the frame, which is the movable portion, in the optical axis direction. As a result, it is possible to prevent the occurrence of a resonance point (for example, near 300 Hz) in the frequency characteristics of AF driving. Therefore, even when the photographer moves, especially when shooting a moving image, it is possible to effectively prevent the shift of the focus. Moreover, the resonance suppressing effect improves the resonance suppressing effect in the shake correction direction. In addition, at the position where the vibration absorbing member is arranged, the gap between a part of the elastic member and the frame serves as a reservoir for the vibration absorbing member, and the vibration absorbing member does not drop out from the gap.

   Preferably, the vibration absorbing member is arranged along the outer shape of the frame, apart from the support mounting portion. With this configuration, it is possible to more effectively prevent the movable portion from vibrating in the optical axis direction.

For example, the frame has a substantially square ring shape,
The vibration absorbing members may be arranged at two or more locations near the four corners of the frame, apart from the support attachment portion, and along the outer shape of the frame. With this configuration, it is possible to more effectively prevent the frame, which is the movable portion, from vibrating in the optical axis direction.

   For example, the elastic members may be arranged at the four corners of the frame while being separated and insulated from each other. With such a configuration, it is possible to form four conductive paths from the fixed portion to the lens holder by using, for example, four support portions made of a conductive member and four elastic members made of a conductive member. it can.

   For example, a cutout may be formed in the frame so that the support attachment portion of the elastic member is arranged outside the frame. With this configuration, it is easy to connect the tip of the support portion formed of, for example, a suspension wire and the elastic member while keeping the size of the frame small. In addition, the movement in the direction intersecting the optical axis of the frame can be made smoother.

   For example, a first step surface that is recessed in the optical axis direction to form a gap is formed in the frame, and a vibration absorbing member is arranged in the gap between the first step surface and the elastic member. .. With such a configuration, the vibration absorbing member can be easily filled, and the once filled vibration absorbing member cannot easily come off from there.

For example, on the outside of the frame, there is a case fixed to the fixed part,
The frame has a second stepped surface that is recessed in a direction substantially perpendicular to the optical axis from the outer surface of the frame where the frame may contact the inner surface of the case due to the relative movement of the frame.
The contact surface of the frame with which the vibration absorbing member contacts is arranged inside the second step surface.

   With this configuration, since the contact surface of the frame with which the vibration absorbing member contacts is disposed inside the second step surface, the frame moves inside the case in the direction intersecting the optical axis. Even if the vibration absorbing member comes into contact with the inner peripheral surface of the case, the vibration absorbing member does not contact the inner peripheral surface of the case, and the vibration absorbing member is unlikely to hang down from the predetermined position to the inner peripheral surface of the case.

   For example, the vibration absorbing member may be in contact with the second surface of the elastic member located on the side opposite to the first surface of the elastic member with which the vibration absorbing member arranged in the gap is in contact. With this structure, the elastic member contacts the vibration absorbing member from both the first surface and the second surface, so that the vibration suppressing effect is further enhanced.

   For example, it is preferable that a part of the elastic member with which the vibration absorbing member is in contact with both the first surface and the second surface has a through hole penetrating the first surface and the second surface. With this configuration, it becomes easy to fill the vibration absorbing member through the through hole, and it becomes easy to dispose the vibration absorbing member on both surfaces of the elastic member.

   For example, the support attachment portion formed on the elastic member may have a U-shaped recess inside. With such a configuration, it is possible to easily attach the tip of the support portion formed of, for example, a suspension wire or the like to the support attachment portion of the elastic member through the U-shaped recess.

For example, the support attachment portion is formed at the intersection of a pair of arm portions that continue from the frame attachment portion,
The arm portions each have a portion that does not contact the vibration absorbing member,
Apart from the intersection of these arm portions, a bridge portion that bridges these arm portions may be formed in the elastic member.

   With this configuration, the stress that tends to concentrate on the arm portion can be dispersed to the bridge portion, the strength of the support attachment portion can be improved, and the tip of the support portion formed of a suspension wire or the like can be improved. However, it is possible to effectively prevent the elastic member from coming off the support mounting portion.

   For example, the elastic member may have a portion where the width of the elastic member is reduced at an intermediate position of the elastic member from the frame mounting portion to the support mounting portion. With this configuration, the elastic force is improved, and the buckling of the support portion formed of the suspension wire or the like can be effectively prevented.

  For example, a tongue portion may be formed on the support attachment portion, and the vibration absorbing member may be arranged between at least a part of the tongue portion and the frame. With this configuration, the resonance suppressing effect is improved, and particularly the resonance suppressing effect in the shake correction direction is improved. Further, preferably, the tongue portion is configured to project from the support attachment portion toward the optical axis. With this configuration, a part of the tongue comes into contact with the frame via the vibration absorbing member without interfering with a part of the elastic member, and the resonance suppressing effect is improved.

FIG. 1A is an overall perspective view of a lens driving device according to an embodiment of the present invention. FIG. 1B is an overall perspective view showing the inside of the lens driving device excluding the case shown in FIG. 1A. FIG. 1C is an overall perspective view of the lens driving device, except for the case shown in FIG. 1B, as seen from a different angle. FIG. 1D is a partially enlarged schematic view showing details of the damper material filled between the pedestal and the rear surface of the frame shown in FIG. 1C. FIG. 1E(A) to FIG. 1E(C) are partially enlarged schematic views showing modifications of the first damper material. FIG. 1F is a partial perspective view showing details of a connection portion between the front spring and the suspension wire shown in FIG. 1B. FIG. 1G is a partial plan view showing details of a connecting portion of the front spring shown in FIG. 1F with the suspension wire. FIG. 1H is a partial side view showing details of a connection portion of the front spring shown in FIG. 1F with a suspension wire. FIG. 1I is a partial perspective view showing details of a connecting portion of a front spring used in a lens driving device according to another embodiment of the present invention and a suspension wire. FIG. 1J is a partial plan view showing details of a connection portion of the front spring shown in FIG. 1I with a suspension wire. FIG. 1K is a partial perspective view showing details of a connecting portion of a front spring and a suspension wire used in a lens driving device according to another embodiment of the present invention. FIG. 1L is a partial plan view showing details of a connecting portion of the front spring shown in FIG. 1K with the suspension wire. FIG. 1M is a partial perspective view showing details of a connecting portion of a front spring and a suspension wire used in a lens driving device according to still another embodiment of the present invention. FIG. 1N is a partial plan view showing details of a connecting portion of the front spring shown in FIG. 1M with the suspension wire. FIG. 2 is an exploded perspective view of the lens driving device excluding the case shown in FIG. 1A. FIG. 3A is a perspective view of the lens holder shown in FIG. FIG. 3B is a perspective view of the lens holder shown in FIG. 3A viewed from different angles. FIG. 4A is a perspective view of the frame shown in FIG. FIG. 4B is a perspective view of the frame shown in FIG. 4A viewed from different angles. FIG. 4C is a perspective view in which the frame and the lens holder shown in FIG. 2 are combined. FIG. 4D is a partially enlarged view of main parts of the frame and the lens holder shown in FIG. 4C. FIG. 4E is a partially enlarged view of a main part of only the frame shown in FIG. 4C. 5A is a plan view in which the circuit board and the drive coil are arranged on the base portion shown in FIG. 2, and FIG. 5B is a plan view of the first drive coil shown in FIG. 5A. FIG. 5C is a plan view of the second drive coil shown in FIG. FIG. 6A is a perspective view of a partial assembly view in which the circuit board and the drive coil are arranged on the base portion shown in FIG. FIG. 6B is an enlarged plan view of FIG. 5A and shows the relationship between the lens and the opening. FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. 6B, and is a cross-sectional view in which a frame and a lens holder are combined at the upper part in the Z-axis direction of the partially assembled view shown in FIG. 6B. FIG. 8 is a graph showing the presence or absence of resonance with respect to frequency in the example of the present invention and the comparative example.

   Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

First Embodiment As shown in FIG. 1A, a lens driving device 2 according to an embodiment of the present invention includes a base portion 10 as a fixed portion and a case 11. The base 10 and the case 11 are joined at the rear open end of the case 11 in the Z-axis direction. As shown in FIG. 1B and FIG. 2, inside the case 11, a circuit board 20 including an FPC, a lens holder 40, and a frame 60 are arranged toward the front side of the base portion 10 in the Z-axis direction. is there. The lens holder 40 and the frame 60 form a shake correction movable portion with respect to the fixed portion.

   The circuit board 20 is provided with a board opening 22 penetrating the front and back surfaces at the center thereof. The tubular convex portion 14 formed in the central portion of the base portion 10 is inserted into the substrate opening portion 22. The tubular convex portion 14 constitutes an opening edge of the base opening portion 12. On the front surface (front surface) of the circuit board 20, the shake correction coil 30 is mounted along the periphery of the board opening portion 22. The circuit board 20 is integrated with the base portion 10 to form a part of the fixed portion.

   The shake correction coil 30 includes a pair of first drive coils 30a that form a first drive shaft, which will be described later, and a pair of second drive coils 30b that form a second drive shaft that intersects the first drive shaft at a substantially right angle. Have. These drive coils 30a and 30b are fixed to the surface of the circuit board 20 with an adhesive or the like.

   The circuit board 20 has a rectangular plate shape as a whole, and a connector portion 23 for connecting to an external circuit is formed on one side of the rectangular outer shape. In all the drawings, the direction parallel to the optical axis of the lens 100 (see FIG. 7) that can be held on the inner peripheral surface 48 of the lens holder 40 is the Z axis, and the direction perpendicular to the optical axis (an example of the intersecting direction). ) Will be described as the X-axis direction and the Y-axis direction.

   The X axis, the Y axis, and the Z axis are perpendicular to each other. In the present embodiment, the X axis matches the first drive axis, and the Y axis matches the second drive axis. Further, the front surface or the front surface along the Z axis means the upward direction in FIGS. 2 and 7, and means the object side with respect to the lens. Further, the rear surface or the rear surface along the Z axis means the downward direction in FIGS. 2 and 7, and means the image pickup element side with respect to the lens.

   As shown in FIG. 2, the base portion 10 includes a base plate body 10a and wire rear end attachment pieces 10b attached to the four corners of the base plate body 10a. A rear end of a single suspension wire 16 is attached to each wire rear end attachment piece 10b. The suspension wires 16 as the support portions extend from the four corner portions of the base portion 10 through the four corner portions of the circuit board 20 toward the front in the Z-axis direction (upward in FIG. 2).

   Holder attachment portions 93a to 93d of the front spring 90 are attached and fixed to the front surface 42 of the lens holder 40 shown in FIG. The sensor component 41 is attached to a part of the outer peripheral surface 47 of the lens holder 40 in the circumferential direction. The sensor component 41 is composed of, for example, a Hall IC component that detects a relative movement in the Z-axis direction of the lens holder 40 with respect to the frame 60 by detecting a relative movement with a Hall element (hole magnet). A hall magnet (not shown) is attached to the inner surface of the frame 60 corresponding to the sensor component 41.

   In the present embodiment, since the sensor component 41 is attached to the lens holder 40, the Z-axis direction position of the lens holder 40 with respect to the frame 60 can be accurately detected in real time, and based on the detection result. Since the lens holder 40 is driven in the Z-axis direction, accurate and quick AF operation can be realized. Note that in such control, particularly when the frame 60 resonates in the Z-axis direction, the lens holder 40 is driven based on the detection signal from the sensor component 41, so that vibration may increase. In the present embodiment, such a situation can be effectively prevented by the vibration absorbing member 70c described later alone (or in cooperation with 70b or in cooperation with 70a).

   As shown in FIGS. 1B and 2, the front spring 90 as an elastic member is composed of four plate-shaped split leaf springs 90a to 90d that are separated from each other and insulated. Each of the split leaf springs 90a to 90d has wire attachment portions (support attachment portions) 92a to 92d to which the front end of the suspension wire 16 is attached. The suspension wire 16 and the split leaf springs 90a to 90d are each made of a conductive material such as metal, and are electrically conductive with each other.

   The suspension wire 16 is freely bendable and elastically deformable along a drive plane including the X axis and the Y axis. The suspension wire 16 can also be elastically deformed in the Z-axis direction when an excessive force is applied, but in a normal lens driving operation, the suspension wire 16 includes the X-axis and the Y-axis, respectively. It flexes freely along the drive plane and is elastically deformed. In order to easily connect the front end of the suspension wire 16 to the wire attachment portions 92a to 92d of the split leaf springs 90a to 90d, as shown in FIG. 4A, the four corners of the frame 60 have cutout portions respectively. 62 is provided.

   Each of the split leaf springs 90a to 90d has frame mounting portions 94a to 94d which are continuous with the wire mounting portions 92a to 92d. The frame attachment portions 94a to 94d are attached and fixed to the four corner portions located on the front surface 64 of the square ring-shaped frame 60 shown in FIG. 4A, for example. The frame 60 itself is made of an insulating material such as plastic.

   As shown in FIG. 4A, a plurality of mounting projections 65 are preferably formed on the front surface 64 located at the corners of the frame 60. Each mounting convex portion 65 fits into a fitting hole formed in the frame mounting portions 94a to 94d of the split leaf springs 90a to 90d shown in FIGS. 1B and 2, and the split leaf springs 90a to 90d are framed. Position and fix at 60. The back surface of each of the split leaf springs 90 a to 90 d is fixed in close contact with the front surface 64 located at the corner of the frame 60. An adhesive may be used when closely fixing.

   Holder attachment portions 93a to 93d are formed on the frame attachment portions 94a to 94d of the split leaf springs 90a to 90d via the meandering portions 95a to 95d, respectively. Fitting holes are formed in each of the holder mounting portions 93a to 93d, and the fitting holes are formed substantially evenly along the circumferential direction on the front surface 42 of the lens holder 40 also shown in FIG. 3A. It fits in the convex portions 43a to 43d.

   That is, by elastically deforming the meandering portions 95a to 95d, the front spring 90 causes the lens holder 40 to move relative to the frame 60 in the optical axis direction by the holder attaching portions 93a to 93d formed at the inner peripheral ends thereof. It is movably held in the Z-axis direction.

   Further, each of the split leaf springs 90a to 90d of the front spring 90 is connected to a separate suspension wire 16 and also to a wiring pattern formed on the front surface of the lens holder 40. Therefore, it becomes possible to supply a drive current to the focusing coil 46 held in the lens holder 40 through the suspension wire 16 and the front spring 90 and to transmit the detection signal detected by the sensor component 41 to the circuit board 20. There is. Each suspension wire 16 can be electrically connected to the wiring pattern of the circuit board 20. That is, by using the four suspension wires 16 made of a conductive member and the four split leaf springs 90a to 90d made of a conductive member, four conductive paths extending from the circuit board 20 as the fixing portion to the lens holder 40 are formed. Can be formed.

   As shown in FIG. 3B, arcuate leaf spring mounting portions 44a and 44b are formed on the rear surface 45 of the lens holder 40. A step portion 49 is formed on the rear side of the outer peripheral surface 47 of the lens holder 40. The rectangular coil-shaped focusing coil 46 shown in FIG. 2 is fixed to the step portion 49.

   As shown in FIG. 2, the rear spring 50 is composed of a pair of split leaf springs 50a and 50b. Each of the split leaf springs 50a and 50b has arcuate holder mounting portions 54a and 54b formed on the inner peripheral portion thereof. The holder mounting portions 54a and 54b are fixed to the leaf spring mounting portions 44a and 44b shown in FIG. 3B. The means for fixing the rear spring 50 to the leaf spring mounting portions 44a, 44b is not particularly limited, and examples include fixing by fitting and fixing with an adhesive or the like.

   As shown in FIG. 2, each split leaf spring 50a, 50b of the rear spring 50 is formed with a meandering portion 55a, 55b continuously at both ends of the holder mounting portion 54a, 54b. Frame attachment portions 52a and 52b are continuously formed on the outer peripheral side of 55b. The frame mounting portions 52a and 52b are fitted and fixed to the corner rear surface 68 of the frame 60.

   That is, in the rear spring 50, similarly to the front spring 90, the meandering portions 55a to 55d are elastically deformed, so that the lens holder 40 is attached to the frame 60 by the holder attaching portions 54a to 54d formed at the inner peripheral ends. On the other hand, it is movably held in the Z-axis direction which is the optical axis direction. However, unlike the front spring 90, the rear spring 50 does not need to have a function of an electrical conduction path.

   As shown in FIGS. 4A and 4B, magnet mounting recesses 66 are formed along the four sides of the square on the rear side of the square ring-shaped frame 60 in the Z-axis direction. As shown in FIGS. 2 and 7, a dual-purpose magnet 80 is fixed to the magnet mounting recess 66 via a magnetic plate 61.

   As shown in FIG. 7, the frame 60 is attached to the base portion 10 by the suspension wire 16 so that a gap (driving gap) is formed between the rear surface of the dual-purpose magnet 80 and the front surface of the shake correction coil 30. It is held in. The frame 60 is movably held with respect to the base portion 10 along a drive plane including the X axis and the Y axis.

   The lens holder 40 is movably held in the Z-axis direction on the frame 60 via the front spring 90 and the rear spring 50 shown in FIG. And moves along a drive plane including the X axis and the Y axis.

   By supplying a drive current to the shake correction coil 30, a force in the direction perpendicular to the optical axis acts on the dual-use magnet 80 due to the cooperative action of the coil 30 and the dual-use magnet 80. Therefore, the frame 60 together with the lens holder 40 can be moved with respect to the base portion 10 along a drive plane including the X axis and the Y axis. By moving the lens 100 along with the lens holder 40 along the drive plane, the shake correction operation can be performed.

   In addition, the lens holder 40 is provided with the frames 60 via the springs 90 and 50 (see FIG. 2) so that a gap is formed between the inner peripheral surface of the dual-purpose magnet 80 and the outer peripheral surface of the focusing coil 46. It is held in. By supplying a drive current to the focusing coil 46, a force in the optical axis direction acts on the coil 46 by the cooperative action (VCM action) of the coil 46 and the dual-purpose magnet 80. Therefore, the lens holder 40 can be moved back and forth in the optical axis direction together with the lens 100 with respect to the frame 60. By moving the lens 100 together with the lens holder 40 in the optical axis direction with respect to the frame 60, an auto focus (AF) operation can be performed.

   In the present embodiment, the combined magnet 80 serves as both the AF control magnet and the shake correction control magnet, so that the number of parts can be reduced, and the AF control and the shake correction control can be performed with a simple configuration. Become. Moreover, it is possible to contribute to downsizing of the lens driving device 2.

   The lens 100 may be composed of a plurality of lens groups, but in the present embodiment, in order to simplify the description, the lens 100 will be described as being composed of one lens.

   As shown in FIGS. 6A and 6B, the shake correction coil 30 includes a pair of first drive coils 30a and 30a facing each other across the opening 12 along the X-axis direction and the opening 12 along the Y-axis direction. And a pair of second drive coils 30b, 30b facing each other with the pair of electrodes sandwiched therebetween. These drive coils 30a and 30b are arranged in parallel along each side of the circuit board 20 so as to surround the cylindrical convex portion 14 on the front surface of the circuit board 20 having a rectangular plate shape as a whole.

   The positions of the first drive coils 30a, 30a facing each other along the X-axis in the Y-axis direction are slightly displaced, and the second drive coils 30b, 30b facing each other along the Y-axis. The arrangement position in the X-axis direction is also slightly displaced. In this way, the drive coils 30a and 30b are displaced in the same direction along the circumferential direction in order to easily mount the position sensors 18a and 18b and the damper base (base) 24 on the four corners of the circuit board 20. In addition, it is for facilitating formation of a through hole of the suspension wire 16.

   The position sensor 18a is composed of, for example, a Hall sensor, and faces the rear surface of the first driving magnet 80a of the dual-purpose magnet 80 shown in FIG. 2 at a predetermined interval together with the first driving coil 30a. The movement position in the X-axis direction can be detected. The position sensor 18b is formed of, for example, a Hall sensor, and faces the rear surface of the second drive magnet 80b of the dual-purpose magnet 80 shown in FIG. 2 at a predetermined interval together with the second drive coil 30b. The movement position of the 80b in the Y-axis direction can be detected. These sensors 18a and 18b are electrically connected to the wiring pattern of the circuit board 20.

   In the present embodiment, the first drive coil 30a and the first drive magnet 80a are arranged so as to face each other at a predetermined interval (drive gap) along the Z-axis direction, and the first drive unit (first 1 VCM), the second drive coil 30b and the second drive magnet 80b are arranged so as to face each other at a predetermined interval (drive gap) along the Z-axis direction, and the second drive unit ( Second VCM). The first drive shaft of the first drive unit is the X-axis, and the second drive shaft of the second drive unit is the Y-axis. The first drive unit and the second drive unit form a cross direction drive unit.

   The damper bases (bases) 24 shown in FIGS. 6A and 6B are fixed to the four corners of the circuit board 20 by means of adhesives or brazing. The damper base 24 is composed of, for example, chip components such as ceramic electronic components.

   As shown in FIGS. 1C and 1D, a gap having a gap width W1 (first damper gap) is formed between the front surface of the damper base 24 and the corner rear surface 68 or the rear convex portion 69 of the frame 60. A gel-like first damper material (vibration absorbing member) 70a is interposed in the first damper gap so as to be in close contact with both. The gap width W1 is larger than the width W0 of the gap (driving gap) between the dual-purpose magnet 80 and the shake correction coil 30, and specifically, it is preferably about 0.1 to 0.4 mm.

   The first damper material 70a is made of, for example, a vibration absorbing material such as a soft gel material or a soft adhesive. The first damper material 70a functions as a damper when the frame 60 moves along the drive plane including the X axis and the Y axis with respect to the base 10 and the circuit board 20, and an effect of suppressing vibration can be expected. .. When the first damper material 70a is made of an ultraviolet curable resin or the like, the viscosity of the first damper material 70a is, for example, 10 to 100 Pa·s, but is not particularly limited.

   As shown in FIG. 1E(A), in the present embodiment, the contact area of the first damper material 70 a on the upper surface of the damper base 24 is the first area on the lower surface of the corner rear surface 68 or the rear convex portion 69 of the frame 60. It is preferably larger than the contact area of the damper material 70a. Alternatively, as shown in FIG. 1E(C), the contact area of the first damper material 70a on the upper surface of the damper base 24 is equal to the contact area of the first damper material 70a on the lower surface of the corner rear surface 68 or the rear convex portion 69 of the frame 60. The contact area may be substantially equal to the contact area. However, as shown in FIG. 1E(B), the contact area of the first damper material 70 a on the upper surface of the damper base 24 is smaller than the contact area of the first damper material 70 a on the lower surface of the corner rear surface 68 or the rear convex portion 69 of the frame 60. May be smaller than the contact area.

   In the present embodiment, the first damper material 70a is provided between the damper base 24 and the corner rear surface 68 of the frame 60, or between the damper base 24 and the rear convex portion 69 of the frame 60, not between the magnet 80 and the coil 30. Is intervened between. Moreover, the gap width W1 is larger than W0. Therefore, in the present embodiment, even if a shock such as a drop of a mobile device including the lens driving device 2 is applied, the magnet 80 and the coil 30 collide with each other, so that the stopper function works. Therefore, the first damper material 70a is held between the damper base 24 and the corner rear surface 68 of the frame 60, or between the damper base 24 and the rear convex portion 69 of the frame 60. Can be maintained, and the damper characteristics can be maintained well even after impact.

   Further, in the present embodiment, as shown in FIGS. 4A to 4E, inward convex portions 72 that project inward are formed on the inside of each of the four corners of the frame 60. As shown in FIG. 4D, the width W2 of the gap between the inner convex portion 72 and the outer peripheral surface 47 of the lens holder 40 is preferably 0.1 to 0.3 mm. A second damper material 70b is filled in the clearance having the width W2 (a clearance for the second damper), and the second damper material 70b has the inner convex portion 72 and the outer peripheral surface 47 of the lens holder 40 in the clearance. It is in close contact with. The second damper material 70b is made of the same material as the first damper material 70a, but is not necessarily the same.

   As shown in FIG. 4E, a damper recess 74 is formed on the front surface 73 of the inward projection 72. The second damper material 70b is also continuously filled in the gaps in the damper recesses 74. Since the second damper material 70b is continuously filled in the gaps in the damper recesses 74 as well, the damper recesses 74 serve as a gel pool, and even if an impact is applied to the lens drive device 2, the second dampers 70a and 70b are formed. There is little risk that the material 70b will fall out of the gap.

   The second damper material 70b functions as a damper when the lens holder 40 is focus-driven with respect to the frame 60 in the optical axis direction (Z-axis direction), and an effect of suppressing vibration can be expected. In the present embodiment, the second damper material 70b is provided near the four corners of the quadrangular frame 60, so that the damper materials 70b at the four positions are arranged at positions farthest from the central axis (optical axis) of the lens. It becomes possible to maximize the function as a damper. As shown in FIG. 4C, one of the four damper materials 70 b is provided between the sensor component 41 attached to a part of the outer peripheral surface of the lens holder 40 and the inner peripheral surface of the frame 60. It may be provided in the gap.

   In the present embodiment, as shown in FIG. 6B, in the base portion 10, a part of the lens 100 moves along a drive plane including the first drive axis (X axis) and the second drive axis (Y axis). An opening 12 is formed for possible insertion. In the present embodiment, the diagonal inner diameters Dxy1 and Dxy2 of the diagonal opening 12 located in the middle of the first drive shaft (X axis) and the second drive shaft (Y axis) are the same as those of the opening 12 in the X axis direction. It is larger than the first inner diameter Dx and larger than the second inner diameter Dy of the opening 12 in the Y-axis direction.

   In this embodiment, the first inner diameter Dx and the second inner diameter Dy are substantially equal. The diagonal inner diameters Dxy1 and Dxy2 are substantially equal to each other. The oblique inner diameters Dxy1 and Dxy2 have maximum lengths near the bisector of the intersection angle between the straight line along the first inner diameter Dx and the straight line along the second inner diameter Dy, and the first inner diameter Dx or the second inner diameter Dx The first inner diameter Dx or the second inner diameter Dy approaches as it approaches the straight line along the inner diameter Dy.

   In the present embodiment, the opening 12 has, for example, an n-sided polygonal shape, and the maximum values of the diagonal inner diameters Dxy1 and Dxy2 are 45 degrees with respect to the X-axis and the Y-axis (the intersection angle between the X-axis and the Y-axis). It is within the range of 1/2)±(360/n) degrees. The shape of the inner peripheral surface of the opening 12 is not limited to a polygon, and may be a curved shape. In that case, the maximum values of the diagonal inner diameters Dxy1 and Dxy2 are within the range of 45 degrees (1/2 of the intersection angle between the X axis and the Y axis) ±15 degrees with respect to the X axis and the Y axis.

   The inner diameter of the opening 12 changes stepwise or continuously from the position where the diagonal inner diameters Dxy1 and Dxy2 are maximum values toward the first inner diameter Dx or the second inner diameter Dy. However, the maximum inner diameters Dxy1 and Dxy2 may be monotonically decreased toward the first inner diameter Dx or the second inner diameter Dy, or may be increased or decreased by repeating the first inner diameter Dx or the second inner diameter Dx. You may make it approach the inner diameter Dy. The maximum values of the diagonal inner diameters Dxy1 and Dxy2 are preferably 1.02 to 1.05 times the first inner diameter Dx or the second inner diameter Dy.

   In the lens driving device 2 according to the present embodiment, as shown in FIG. 6B, the diagonal inner diameters Dxy1 and Dxy2 of the diagonal opening 12 located in the middle of the X-axis and the Y-axis are the same as those in the X-axis direction of the opening 12. It is larger than the first inner diameter Dx and larger than the second inner diameter Dy of the opening 12 in the Y-axis direction. With this configuration, the lens 100 configures the opening edge of the opening 12 not only when the lens 100 moves in the X-axis direction or the Y-axis direction but also when the lens 100 moves in an oblique direction between them. There is no possibility of colliding with the inner peripheral surface of the cylindrical convex portion 14 that is formed.

   In addition, in the lens driving device 2 according to the present embodiment, the opening 12 formed in the base portion 10 is not a perfect circle, and the inner diameters Dxy1 and Dxy2 in the diagonal direction are located in the middle of the X direction or the Y axis direction. Has a large irregular shape. Therefore, the outer shape of the base portion 10 can be made smaller than that of a true circular opening in consideration of the maximum amount of movement in the diagonal direction, which contributes to downsizing of the device. In particular, as shown in FIG. 6B, there is space in the diagonal direction intersecting the X-axis and the Y-axis, and even if the inner diameter of the opening 12 is increased in that direction, the outer shapes of the base portion 10 and the circuit board 20 are increased. Does not have to be large.

   In addition, when the outer shapes of the base portion 10 and the circuit board 20 are assumed to be the same, in the present invention, the X-axis and the Y-axis are compared to a true circular opening in which the maximum amount of diagonal movement is taken into consideration. The width of the base portion 10 excluding the opening 12 can be increased. Therefore, the number of turns of the first drive coil 30a and the second drive coil 30b can be increased, the driving force is improved, and the accuracy of blur correction is improved.

   Further, in the present embodiment, the first drive unit includes a pair of first drive coils 30a located on both sides of the opening 12 along the X-axis direction, and the pair of first drive coils 30a is the base unit 10. Are arranged in parallel along the two opposite sides. With this configuration, the driving force along the X-axis direction is improved and the blur correction accuracy is improved.

   In addition, the second drive unit includes a pair of second drive coils 30 b located on both sides of the opening 12 in the Y-axis direction, and the pair of second drive coils 30 b are opposed to each other in the base unit 10. They are arranged in parallel along the sides. With this configuration, the driving force along the Y-axis direction is improved, and the accuracy of blur correction is improved.

   Further, as shown in FIG. 4A, the frame 60 has a square ring shape as a whole, and as shown in FIG. 1, the frame 60 is arranged inside a square tube-shaped case 11 fixed to the base 10 and has an oblique direction. , Substantially coincides with the diagonal direction of the square ring shape. With this configuration, as shown in FIG. 6B, it becomes possible to efficiently arrange the first drive coil 30a and the second drive coil 30b on the base portion 10 excluding the opening 12. The outer shape of the base portion 10 can be reduced, and the device 2 can be easily downsized.

   Further, in the present embodiment, as shown in FIG. 6B, a cylindrical convex portion 14 is formed in the base portion 10 along the opening edge of the opening portion 6, and the cylindrical convex portion 14 is formed around the cylindrical convex portion 14. The 1st drive coil 30a and the 2nd drive coil 30b are arrange|positioned. With this configuration, it is possible to effectively prevent the lens 100 from colliding with the first drive coil 30a and the second drive coil 30b arranged around the cylindrical convex portion 14.

   Further, the presence of the cylindrical protrusion 14 makes it difficult for dust and the like existing on the surfaces of the base 10 and the circuit board 20 to enter the inside of the opening 12. The lens 100 passes through the inside of the opening 12, and an image sensor or the like is arranged at a position behind the lens 100 in the optical axis direction. If dust or the like adheres to the image sensor, the quality of the image to be captured may deteriorate, and it is preferable that dust or the like does not enter the inside of the opening 12.

   Further, as shown in FIGS. 5(A) to 5(C), the presence of the tubular convex portion 14 allows the wire wiring 32a for connecting the pair of first drive coils 30a and the pair of second drive coils 30b. It becomes easy to arrange the wire wiring 32b that communicates with and along the outer peripheral surface of the cylindrical convex portion 14. Further, the lead wirings 34a and 34b of the drive coils 30a and 30b are connected to the circuit pattern of the circuit board 20 by effectively utilizing the corner spaces between the cylindrical convex portion 14 and the drive coils 30a and 30b. It's easy to do.

   Particularly, in the lens driving device 2 according to the present embodiment, instead of embedding the coil inside the coil substrate, the first driving coil 30a and the second driving coil 30b are fixed to the front surface of the circuit board 20 as the fixing portion. is there. Therefore, it is easy to increase the number of turns of the drive coils 30a and 30b, and it is possible to increase the driving force of the drive coils 30a and 30b.

   Moreover, in the lens driving device according to the present embodiment, the damper base 24 as a pedestal is provided on the front surface of the circuit board 20 as the fixed part, and the damper base 24 and the corner portion of the frame 60 as the shake correction movable part. A first damper material 70a as a vibration absorbing member is filled in the first damper gap with the rear surface 68.

   Therefore, as compared with the case where the front surface of the circuit board 20 as the fixing portion is directly filled with the first damper material 70a, the first damper material 70a is less likely to fall off. As a result, the damper characteristics are improved, resonance and the like can be effectively prevented, and the shake correction function is improved. That is, it is possible to prevent the frame 60, which is the shake correcting movable portion, from resonating in the direction perpendicular to the optical axis with respect to the circuit board 20 and the base portion 10 which are the fixed portions, and particularly in the optical axis direction. Resonance can be effectively suppressed.

   In addition, since the damper base 24 as a pedestal is provided on the front surface of the circuit board 20 as the fixing portion, by controlling the area of the front surface of the damper base 24, it is possible to apply the gel-like substance to be the first damper material 70a. The amount can be easily controlled, and the required amount of the first damper material 70a can be easily formed. Further, when an impact force at the time of dropping acts, the gap for the first damper is larger than the gap for driving, so that the driving coils 30a, 30b collide with the driving magnets 80a, 80b, and the stopper is stopped. The function acts and the gap for the first damper is not lost. Therefore, the first damper material 70a does not completely protrude from the first damper gap.

   Further, as shown in FIG. 1D, the Z-axis direction heights of the first drive coil 30a and the second drive coil 30b from the front surface of the circuit board 20 as the fixing portion are higher than the Z-axis direction height of the damper base 24. high. Since the damper base 24 is lower than the drive coil 30, the first damper gap can be made sufficiently larger than the driving gap.

   The frame 60 can be made of plastic or the like, and it is easy to control the contact area with the first damper material 70a and easily control the filling amount of the first damper material 70a.

   Further, the damper bases 24 are fixed to the rectangular positions on the upper surface of the circuit board 20 having a rectangular plate shape. Therefore, it is possible to effectively utilize the four vacant spaces on the front surface of the fixed circuit portion 20 to arrange the first damper material 70a. Further, since the first damper members 70a are arranged on the diagonal line, the distance between the first damper members 70a can be maximized. As a result, it is possible to effectively prevent resonance in the direction in which the frame 60, which is the shake correction movable portion, tilts with respect to the circuit board 20 and the base portion 10, which are the fixed members.

   The damper base 24 can be composed of chip components such as ceramic electronic components. In the case of a chip component, since the terminal (external) electrode is formed, it is easy to connect or adhere to a fixed portion such as a circuit board. In addition, the surface of the chip component has irregularities and has an excellent bonding force with the vibration absorbing member, so that the vibration absorbing member can be more effectively prevented from falling off the pedestal. The vibration absorbing member may be attached not only to the front surface of the pedestal but also to the side surface.

   Particularly, in the lens driving device 2 according to the present embodiment, the second damper material 70b is filled in at least one position along the circumferential direction in the gap between the outer peripheral surface of the lens holder 40 and the inner peripheral surface of the frame 60. I am doing it. Therefore, the resonance of the lens holder 40 with respect to the frame 60 can be effectively suppressed. As a result, during the shake correction operation or the autofocus operation, particularly during the autofocus operation, the lens holder 40 is not likely to resonate with the frame 60, and these operations can be favorably performed.

   Moreover, in the lens driving device 2 according to the present embodiment, the second damper material 70b fills the gap between the outer peripheral surface of the lens holder 40 and the inner peripheral surface of the frame 60 near the four corners of the frame 60. Recesses 74 are formed near the respective corners. With this configuration, the second damper material 70b can be arranged by effectively utilizing the space vacant on the inner peripheral surface of the frame 60, and the second damper material 70b is arranged diagonally. The resonance in the direction in which the lens holder 40 tilts with respect to the frame 60 can be more effectively prevented.

   At a position where the second damper material 70b is filled, a concave portion 74 that opens toward the gap is formed on the inner peripheral surface of the frame 60. Therefore, the recessed portion 74 serves as a reservoir for the second damper material 70b, and even if the lens holder 40 moves largely with respect to the frame 60 in the optical axis direction or in the direction perpendicular to the optical axis, the second damper material 70b leaves the gap. It will never fall out. In particular, even if the lens holder 40 moves significantly with respect to the frame 60 in the optical axis direction or in the direction perpendicular to the optical axis due to the impact when dropped, the second damper material 70b does not drop out from the gap.

   As shown in FIG. 4D, the inner peripheral surface of the corner portion of the frame 60 has a sufficient space, and the inner convex portion 72 may be provided to form the concave portion 74 on the front surface 73 of the inner convex portion 72. It's easy. It is easy to inject a gel-like substance, which will be the second damper material 70b, into this recess 74, and workability is improved. The recess 74 may be formed on the outer peripheral surface of the lens holder 40, or may be formed on both the inner peripheral surface of the frame 60 and the outer peripheral surface of the lens holder 40.

   Further, in the present embodiment, as shown in FIGS. 1F to 1H, between the frame 60 and a part of the flat plate-shaped split leaf spring 90a located between the frame attachment portion 94a and the wire attachment portion 92a, A first step surface 64a that is recessed in the optical axis (Z-axis) direction is formed on the front surface 64 of the frame 60 so that the gap 63 is formed. The first step surfaces 64a are formed on the front surfaces of the step-shaped convex portions 62a formed in pairs at the corners of the frame 60, and are located on both sides of the wire attachment portion 92a. The step-like convex portion 62a is formed so as to project in the XY axis direction at the front (upper) of the cutout portion 62 in the Z-axis direction, and each step-like convex portion 62a is smaller than the cutout portion 62. A cutout portion 62b is formed. The wire attachment portion 94a is located in the cutout portion 62b.

   1F to 1H, one split leaf spring 90a is shown as an example, but the other split leaf springs 90b to 90d shown in FIG. 2 also have the same configuration, and therefore the illustration thereof is omitted. The description is omitted. The first step surface 64a is also shown in FIG. 4A.

   As shown in FIG. 1A, the case 11 is arranged outside the frame 60. The outer peripheral surface 67 of the frame 60 shown in FIGS. 1F to 1H may come into contact with the inner surface of the case 11 shown in FIG. 1A due to the relative movement of the frame 60 in the X-Y axis directions. In the present embodiment, at each corner of the frame 60, the second step surface 67a that is recessed in the X-axis and Y-axis directions from the outer peripheral surface 67 of the frame 60 is adjacent to the first step surface 64a. One pair is formed at each corner of the. The first step surface 64a is arranged inside the second step surface 67a. The first step surface 64a is formed on the front surface of the step-shaped convex portion 62a in the Z-axis direction, and the second step surface 67a is formed on the side surface of the step-shaped convex portion 62a in the Y-axis direction or the X-axis direction. is there.

   In the present embodiment, the third damper material 70c is arranged so as to fill the gap 63 between the first step surface 64a and the back surface of the split leaf spring 90a. The width of the gap 63 is preferably about the same as the width W1 shown in FIG. 1D or the width W2 shown in FIG. 4C. In the present embodiment, each first step surface 64a becomes a contact surface with the third damper material 70c. The third damper material 70c is preferably made of the same material as the first damper material 70a or the second damper material 70b, but it is not necessarily required to be made of the same material.

   At the position where the third damper material 70c is arranged on the upper surface of the first step surface 64a, the split leaf spring 90a is provided with one or more through holes 98 having a size smaller than that of the first step surface 64a. Since the through hole 98 is formed, it is easy to fill the gap 63 with the third damper material 70c, and the third damper material 70c disposed on the upper surface (front surface in the Z-axis direction) of the split leaf spring 90. The continuity with and is maintained, and the vibration absorption characteristics are improved.

   The formation pattern of the third damper material 70c arranged on the upper surface (front surface in the Z-axis direction) of the split leaf spring 90 may be the same pattern as the formation pattern of the third damper material 70c filled in the gap 63. It is preferable, but not necessarily the same pattern. The thickness of the third damper material 70c arranged on the upper surface (front surface in the Z-axis direction) of the split leaf spring 90 in the Z-axis direction is approximately the same as the thickness of the third damper material 70c filled in the gap 63. Are preferable, but they do not necessarily have to have the same thickness.

   The area of each first step surface 64a is not particularly limited, and is preferably approximately the same as the area of the upper surface of the damper base 24 on which the first damper material 70a is installed, for example. In the present embodiment, the third damper material 70c sandwiches a part of the split leaf spring 90a from above and below in the Z-axis direction at a position between the wire attachment portion 92a and the frame attachment portion 94a.

   The first step surfaces 64a are arranged near the four corners of the frame 60, apart from the wire attachment portion 92a, and arranged at two locations along the outer shape of the frame 60, respectively. Accordingly, the third damper material 70c is arranged at two locations along the outer shape of the frame 60 without contacting the wire attachment portion 92a and the suspension wire 16.

   In the present embodiment, a gap 63 is formed between the frame 60 and a part of the split leaf springs 90a to 90d located between the frame mounting portions 94a to 94d and the wire mounting portions 92a to 92d. A third damper member 70c as a vibration absorbing member is arranged in the gap 63. Therefore, it is possible to effectively prevent the frame 60, which is the movable portion, from vibrating in the optical axis direction in the frequency band associated with the AF operation. As a mode in which the frame 60 vibrates in the optical axis direction, there are a mode in which the four corners of the frame 60 uniformly vibrate in the Z axis direction and a mode in which the four corners vibrate in the Z axis direction unevenly. In the present embodiment, since the third damper material 70c is arranged at each of the four corners, vibration of any aspect can be effectively prevented.

   Further, in the present embodiment, since the third damper material 70c is arranged, it is possible to reduce the filling amount of the first damper material 70a, and it is necessary to accurately control the filling amount of the first damper material 70a. Also disappears. Furthermore, when the vibration of the frame in the X-Y axis direction is suppressed by means other than the first damper material 70a, or when the vibration suppression is not necessary, the first damper material 70a may not be used. .. As for the second damper material 70b, if the vibration of the lens holder 40 and the frame 60 in the Z-axis direction is suppressed by other means, or if the vibration suppression is not necessary, the second damper material 70b is used. It does not have to be used.

   As a result, for example, as shown in the embodiment shown by the solid line in FIG. 8, the resonance point (particularly around 300 Hz related to the AF operation) like the comparative example shown by the dotted line in FIG. 8 without the third damper material 70c is generated. It is possible to prevent the possibility of occurrence. Therefore, even when the photographer moves, especially when shooting a moving image, it is possible to effectively prevent the shift of the focus. Moreover, at the position where the third damper material 70c is arranged, the gap 63 between a part of the split leaf springs 90a to 90d and the first step surface 64a of the frame 60 is a pool for the third damper material 70c. The third damper material 70c does not fall out of the gap 63.

   Moreover, the third damper material 70c is arranged along the shape of the outer peripheral surface 67 of the frame 60, apart from the suspension wire 16 and the wire attachment portions 92a to 92d. With this configuration, it is possible to more effectively prevent the frame 60, which is the movable portion, from vibrating in the Z-axis direction.

   Further, since the wire attachment portions 92a to 92d are arranged outside the cutout portion 62 at the corners of the frame 60, for example, the tip of the suspension wire 16 and the split leaf spring 90a are kept while keeping the size of the frame 60 small. The connection with the wire mounting portions 92a to 92d of 90 to 90d becomes easy. Further, the movement of the frame 60 in the X-Y axis direction intersecting the Z axis can be made smoother. The tip of the suspension wire 16 and the wire attachment portions 92a to 92d of the split leaf springs 90a to 90d are connected by, for example, soldering or laser welding to form the connection portion 16a (see FIGS. 1F to 1H). To be done.

   Further, since the first step surface 64a, which is the contact surface of the frame 60 with which the third damper material 70c contacts, is arranged inside the second step surface 67a, the outer peripheral surface 67 of the frame 60 is shown in FIG. 1A. Even if the third damper material 70c moves inside the case 11 and contacts the inner peripheral surface of the case 11, the third damper material 70c does not contact the inner peripheral surface of the case 11. Therefore, it is less likely that the third damper material 70c hangs from the predetermined position on the inner peripheral surface of the case 11 or peels off.

   Furthermore, in the present embodiment, the third damper material 70c contacts both surfaces of the split leaf springs 90a to 90d in the Z-axis direction, so the vibration suppressing effect is further enhanced. Moreover, since the through holes 98 are formed in the split leaf springs 90a to 90d at the positions where the third damper members 70c are arranged, it becomes easy to fill the third damper members 70c through the through holes 98. Moreover, it becomes easy to dispose the third damper material 70c on both surfaces of the split leaf springs 90a to 90d.

   Further, as shown in FIG. 1G, since the wire attachment portions 92a to 92d have a concave portion 99 having a U-shaped recess inside, the tip of the suspension wire 16 can be easily passed through the U-shaped concave portion 99. It is possible to attach it to the wire attachment portion 92a and perform laser welding or soldering.

   Further, as shown in FIGS. 1F and 1G, openings 91 are formed in the split leaf springs 90a to 90d located between the pair of first step portions 64a located near the corners of the frame 60. The wire attachment portion 92a is formed at the intersection of a pair of arm portions 96 continuous from the frame attachment portions 90a to 90d. Further, the arm portions 96 each have a portion that does not contact the third damper material 70c. Moreover, apart from the intersection of these arm portions 96, a bridge portion 97 that bridges these arm portions 96 is formed.

   With this configuration, the stress that tends to concentrate on the arm portion 96 can be dispersed to the bridge portion 97, the strength of the wire attachment portions 92a to 92d can be improved, and the tip of the suspension wire 16 can be It is possible to effectively prevent the wire attachment portions 92a to 92d from coming off.

   In addition, since the split leaf springs 90a to 90d have a portion where the width of the split leaf springs 90a to 90d becomes smaller at an intermediate position of the arm portion 96 from the frame attaching portion 94a toward the wire attaching portions 92a to 92d, the elasticity of the wire attaching portions 92a to 92d is reduced. The force is improved, and the buckling of the suspension wire 16 can be effectively prevented.

Second Embodiment As shown in FIGS. 1I and 1J, the lens driving device according to another embodiment of the present invention is different only in the configuration of the four split leaf springs 190 constituting the front springs as elastic members. However, the configurations and effects of the other parts are the same as those of the first embodiment, and the description of the common parts will be partially omitted. Hereinafter, a part different from the first embodiment will be mainly described.

   In the split leaf spring 190 of this embodiment, the through hole 98 shown in FIGS. 1F and 1G is not formed, and the bridge portion 97 is also not formed. The shape of the opening 191 is different from the shape of the opening 91. The shape of the arm portion 196 is also different from the shape of the arm portion 96. The wire attachment portion 192 is similar to the recess 99 of the first embodiment in that a U-shaped recess 199 is formed. The shape of the frame mounting portion 194 is substantially the same as that of the frame mounting portions 94a to 94d of the first embodiment except that the through hole 98 is not formed. Other structures, functions and effects of this embodiment are the same as those of the first embodiment.

Third Embodiment As shown in FIGS. 1K and 1L, in a lens driving device according to another embodiment of the present invention, four split leaf springs 290 that form a front spring as an elastic member and a stepped protrusion of the frame 60. Only the configuration of the portion 262a (corresponding to the step-shaped convex portion 62a) is different, and the configuration and action and effect of other portions are similar to those of the first embodiment or the second embodiment, and description of common portions Are partially omitted. Hereinafter, parts different from the above-described embodiment will be mainly described.

   In the split leaf spring 290 of this embodiment, the number and arrangement of the through holes 298 corresponding to the through holes 98 shown in FIGS. 1F to 1H are different, and the shape of the wire attachment portion 292 is different. The wire attachment portion 292 is similar to the concave portion 99 of the first embodiment in that a U-shaped concave portion 299 is formed, but a substantially circular tongue is formed inside the concave portion 299 (on the optical axis side of the lens). The portion 292α is formed integrally with the leaf spring 290. At least a part (most part in the figure) of the tongue portion 292α is in contact with the first step surface 264a of the step convex portion 262a via the third damper material 70c.

  The second step surface 267a of the step-like convex portion 262a is similar to the second step surface 67a of the above-described embodiment, but the cutout portion 262b of the step-like convex portion 262a is the cutout portion 62b of the above-described embodiment. Is narrower than. The wire attachment portion 292 except the tongue portion 292α is located on the cutout portion 262b. The cutout portion 262b has a size such that the tongue portion 292α can pass through the suspension wire 16 and come into contact with the first stepped surface 264a of the stepped convex portion 262a via the third damper material 70c. The third damper material 70c does not contact the connecting portion 16a of the wire 16.

  In this embodiment, the shape of the opening 291 is different from the shape of the opening 91 of the above-described embodiment, and the bridge portion 97 is not formed. The mounting projection 265 formed on the front surface 64 of the frame 60 is inserted into the opening 291 to position the split leaf spring 290 and the frame 60. The shape of the arm portion 296 is also different from the shape of the arm portion 96 of the above-described embodiment. Furthermore, the shape of the frame attachment portion 294 is basically the same as that of the frame attachment portions 94a to 94d of the first embodiment except that the shape and number of the through holes 298 and the shape of the opening 291 are different. .

  In the present embodiment, a substantially circular tongue portion 292α is formed integrally with the leaf spring 290 inside the recess 299 of the wire attachment portion 292 (on the optical axis side of the lens). At least a part (most part in the figure) of the tongue portion 292α is in contact with the first step surface 264a of the step convex portion 262a via the third damper material 70c. That is, in the present embodiment, a part of the wire attachment portion 292 is located near the connecting portion 16a that does not contact the third damper material 70c, and the first step surface of the step-like convex portion 262a passes through the third damper material 70c. It is in contact with 264a. From this, the resonance suppressing effect is improved, and particularly, the resonance suppressing effect in the shake correction direction (X-axis and Y-axis directions) is improved. Other structures, functions, and effects of this embodiment are similar to those of the first and second embodiments.

Fourth Embodiment As shown in FIGS. 1M and 1N, in a lens driving device according to another embodiment of the present invention, four split leaf springs 390 forming a front spring as an elastic member and a stepped projection of the frame 60. Only the configuration of the portion 362a (corresponding to the step-shaped convex portion 62a) is different, and the configuration and action and effect of the other portions are the same as those of the first to third embodiments, and the description of the common portions is one. Omitted part. Hereinafter, a part different from the above-described embodiment will be mainly described.

   In the split leaf spring 390 of the present embodiment, a through hole 398 corresponding to the through hole 98 shown in FIGS. 1F and 1G communicates with the opening 391, the shape of the frame attaching portion 394 is different, and the wire attaching portion 392 is different. Are different in shape. The wire attachment portion 392 is similar to the recess 199 of the second embodiment in that a U-shaped recess 399 is formed, but a substantially semicircular shape is formed inside the recess 399 (on the optical axis side of the lens). The tongue portion 392α is formed integrally with the leaf spring 390. At least a part (most part in the figure) of the tongue portion 392α is in contact with the first step surface 364a of the step convex portion 362a via the third damper material 70c.

  In this embodiment, the step-shaped convex portion 362a is not formed with a step surface corresponding to the second step surfaces 67a and 267a of the above-described embodiment. Further, the cutout portion 362b of the step-shaped convex portion 362a is narrower than the cutout portion 62b of the above-described embodiment, but is wider than the cutout portion 262b. The wire attachment portion 392 except the tongue portion 392α is located on the cutout portion 362b.

  The cutout portion 362b has a size such that the tongue portion 392α can come into contact with the first step surface 364a of the step-shaped convex portion 362a through the suspension wire 16 and the third damper member 70c. The third damper member 70c does not come into contact with the connecting portion 16a of the wire 16. In the cutout portion 362b, a third damper material 70c may be embedded at a position below the wire attachment portion 392 in the Z-axis direction so as not to contact the wire attachment portion 392 and the connection portion 16a. The third damper material 70c embedded in the cutout portion 362b is in contact only with the suspension wire 16 and the inner surface of the cutout portion 362B.

  In this embodiment, the shape of the opening 391 is different from the shape of the opening 91 of the above-described embodiment, and the bridge portion 97 is not formed. The shape of the arm portion 396 is also different from the shape of the arm portion 96 of the above-described embodiment. Further, the shape of the frame mounting portion 394 is basically the same as that of the frame mounting portions 94a to 94d of the first embodiment except that the shape and number of the through holes 398 and the shape of the opening 391 are different. .

  In the present embodiment, a substantially circular tongue portion 392α is formed integrally with the leaf spring 390 inside the recess 399 of the wire attachment portion 392 (on the optical axis side of the lens). At least a part (most part in the figure) of the tongue portion 392α is in contact with the first step surface 364a of the step-like convex portion 362a via the third damper material 70c. That is, in the present embodiment, a part of the wire attachment portion 392 is located near the connection portion 16a that does not contact the third damper material 70c, and the first step surface of the step-shaped convex portion 362a passes through the third damper material 70c. It is in contact with 364a. From this, the resonance suppressing effect is improved, and particularly, the resonance suppressing effect in the shake correction direction (X-axis and Y-axis directions) is improved. Other structures, functions, and effects of this embodiment are the same as those of the first to third embodiments.

   It should be noted that the present invention is not limited to the above-described embodiment and can be modified in various ways. For example, the damper base 24 as a pedestal is fixed to the surface of the circuit board 20 by reflowing or the like, but it may be formed integrally with the circuit board.

   Further, in the above-described embodiment, the rear convex portion 69 protruding toward the damper base 24 is formed on the rear portion 68 of the corner portion of the frame 60 which is the movable portion for blur correction, but the rear convex portion 69 is It is not always necessary. By providing the rear convex portion 69, it becomes easier to adjust the gap width of the first damper gap along the Z-axis direction. However, depending on the height of the damper base 24 in the Z-axis direction and the like, the rear convex portion 69 may be formed. It may be better not to have 69.

   Further, in the above-described embodiment, the first drive shaft and the second drive shaft are arranged in parallel to the respective sides of the rectangular plate-shaped base portion 10 and the circuit board 20, but the present invention is not limited to this. For example, the first drive coil 30a and the second drive coil 30b are arranged so that the first drive shaft and the second drive shaft are located on the diagonal lines of the square plate-shaped base portion 10 and the circuit board 20. Is also good.

   Further, in the above-described embodiment, the single dual-purpose magnet 80 has the two functions of the shake correction magnet and the autofocus magnet, but separate magnets may be prepared and attached. .

   Further, in the embodiment described above, the intersection angle between the first drive shaft and the second drive shaft is 90 degrees, but in the present invention, these intersection angles may be other than 90 degrees.

   In the above-described embodiment, as the means for holding the frame 60 as the shake correction movable portion along the drive plane (including the X axis and the Y axis) so as to be movable with respect to the base portion 10 as the fixed portion, four pieces are provided. However, the number of suspension wires is not limited to four, and a plurality of suspension wires may be used.

   Further, the front springs 90 and 190 as the elastic members are not limited to the flat springs having a flat plate shape divided into four, and may be a two-division type, a division into four or more divisions, or a single spring. good.

   Further, the supporting portion is not limited to the suspension wire 16 and may be another supporting portion such as a leaf spring or a ball bearing. Further, the specific shape of the tongue portion 292α or 392α in the above-described third embodiment or fourth embodiment is not limited to the substantially circular shape and the substantially semicircular shape, but is also a substantially elliptical shape, a substantially semielliptical shape, a trapezoidal shape, and many other shapes. A prismatic shape is also preferable. It is also preferable that the specific shape of the tongue portions 292α and 392α is such that the width thereof becomes wider in the protruding direction from the wire attachment portion 292 or 392. With such a shape, the contact area with the third damper material 70c can be increased without interfering with the arm portion 296 or 396, and the resonance suppressing effect is improved.

2... Lens drive device 10... Base part 11... Case 12... Base opening part 14... Cylindrical convex part 16... Suspension wire 16a... Connection parts 18a, 18b... Position sensor 20... Circuit board 22... Board opening part 23... Connector part 24... Damper stand 30... Shake correction coil 30a... 1st drive coil 30b... 2nd drive coil 40... Lens holder 41... Sensor parts 42... Front surface 43a-43d... Attachment convex part 44a, 44b... Leaf spring attachment Part 45... Rear surface 46... Focusing coil 47... Outer peripheral surface 48... Inner peripheral surface 49... Step portion 50... Rear springs 50a, 50b... Split leaf springs 52a, 52b... Frame mounting portion 54a, 54b... Holder mounting portion 55a-55d ... meandering part 60... frame 61... magnetic material plate 62... notch part 62a, 262a, 362a... step-like convex part 62b, 262b, 362b... notch part 63... gap 64... front face 64a, 264a, 364a... first step Surface 65, 265... Mounting convex portion 66... Magnet mounting concave portion 67... Outer peripheral surface 67a, 267a... Second step surface 68... Corner rear surface 69... Rear surface convex portion 70a... First damper material 70b... Second damper material 70c... 3rd damper material 72... Inward convex part 73... Front surface 74... Damper recess 80... Dual use magnet 80a... 1st drive magnet 80b... 2nd drive magnet 90... Front spring 90a-90d, 190, 290, 390... Split leaf springs 91, 191, 291, 391... Openings 92a to 92d, 192, 292, 392... Wire mounting portion (support mounting portion)
292α, 392α... Tongue portion 93a-93d... Holder mounting portion 94a-94d, 194, 294, 394... Frame mounting portion 95a-95d... Meandering portion 96, 196, 296, 396... Arm portion 97... Bridge portion 98, 298, 398... Through-hole 99, 199... Recess 100... Lens

Claims (13)

A lens holder capable of holding at least one lens,
An elastic member that holds the lens holder along the optical axis of the lens so as to be movable relative to the frame,
An optical axis direction drive unit that moves the lens holder relative to the frame along the optical axis;
A support part that connects the elastic member and the fixing part so as to movably support the frame along a direction intersecting the optical axis,
A lens driving device comprising: a cross direction driving unit that moves the frame with respect to the fixed unit along a direction intersecting the optical axis.
The elastic member is
A holder mounting portion mounted on the lens holder,
A frame attachment part attached to the frame;
A support attachment portion attached to the support portion,
A gap is formed between a part of the elastic member located between the frame attachment portion and the support attachment portion and the frame,
A vibration absorbing member is arranged in the gap,
A case fixed to the fixing portion is arranged on the outer side of the frame,
From the outer surface of the frame where the frame may contact the inner surface of the case due to the relative movement of the frame, a second step surface recessed in a direction substantially perpendicular to the optical axis is formed in the frame,
The vibration absorbing member contact surface of the frame in contact, the lens driving device Ru located inside tare than the second step surface. A lens holder capable of holding at least one lens,
An elastic member that holds the lens holder along the optical axis of the lens so as to be movable relative to the frame,
An optical axis direction drive unit that moves the lens holder relative to the frame along the optical axis;
A support part that connects the elastic member and the fixing part so as to movably support the frame along a direction intersecting the optical axis,
A lens driving device comprising: a cross direction driving unit that moves the frame with respect to the fixed unit along a direction intersecting the optical axis.
The elastic member is
A holder mounting portion mounted on the lens holder,
A frame attachment part attached to the frame;
A support attachment portion attached to the support portion,
A gap is formed between a part of the elastic member located between the frame attachment portion and the support attachment portion and the frame,
A vibration absorbing member is arranged in the gap,
The vibration absorbing member is also in contact with the second surface of the elastic member located on the opposite side of the first surface of the elastic member with which the vibration absorbing member arranged in the gap comes into contact,
A lens drive in which a through hole penetrating the first surface and the second surface is formed in a part of the elastic member with which the vibration absorbing member is in contact with both the first surface and the second surface. apparatus. A lens holder capable of holding at least one lens,
An elastic member that holds the lens holder along the optical axis of the lens so as to be movable relative to the frame,
An optical axis direction drive unit that moves the lens holder relative to the frame along the optical axis;
A support part that connects the elastic member and the fixing part so as to movably support the frame along a direction intersecting the optical axis,
A lens driving device comprising: a cross direction driving unit that moves the frame with respect to the fixed unit along a direction intersecting the optical axis.
The elastic member is
A holder mounting portion mounted on the lens holder,
A frame attachment part attached to the frame;
A support attachment portion attached to the support portion,
A gap is formed between a part of the elastic member located between the frame attachment portion and the support attachment portion and the frame,
A vibration absorbing member is arranged in the gap,
The support mounting portion is formed at an intersection of a pair of arm portions continuous from the frame mounting portion,
A lens in which the arm portion formed in the elastic member has a bridge portion that bridges the arm portion, which is a portion that does not come into contact with the vibration absorbing member and is separate from the intersection portion of the arm portions. Drive. The vibration absorbing member, the support away from the mounting portion, the lens driving device according to claim 1 to 3 of which are arranged along the outer shape of the frame. The frame has a substantially square ring shape,
The lens according to claim 4 , wherein the vibration absorbing members are arranged near the four corners of the frame, apart from the support mounting portion, and arranged at two or more positions along the outer shape of the frame. Drive. The lens driving device according to claim 5 , wherein the elastic members are arranged at four corners of the frame while being separated and insulated from each other. A lens holder capable of holding at least one lens,
An elastic member that holds the lens holder along the optical axis of the lens so as to be movable relative to the frame,
An optical axis direction drive unit that moves the lens holder relative to the frame along the optical axis;
A support part that connects the elastic member and the fixed part so as to movably support the frame with respect to the fixed part along a direction intersecting the optical axis,
A lens driving device comprising: a cross direction driving unit that moves the frame with respect to the fixed unit along a direction intersecting the optical axis.
The elastic member is
A holder mounting portion mounted on the lens holder,
A frame attachment part attached to the frame;
A support attachment portion attached to the support portion,
A gap is formed between a part of the elastic member located between the frame attachment portion and the support attachment portion and the frame,
A vibration absorbing member is arranged in the gap,
A lens driving device in which a tongue portion is formed on the support mounting portion, and the vibration absorbing member is disposed between at least a part of the tongue portion and the frame . Support bracket portion of the elastic member is to be positioned outside of the frame, the frame, the lens driving device according to any one of claims 1 to 7, the cutout portion is formed. The frame has a first step surface recessed in the optical axis direction to form the gap, and the vibration absorbing member is provided in the gap between the first step surface and the elastic member. the lens driving device according to any one of claims 1 to 8, but is disposed. Wherein also the second surface of the elastic member located on the first surface and the opposite side of the elastic member to which the vibration absorbing member disposed in the gap is in contact, according to claim wherein the vibration absorbing member is in contact 1,3 7. The lens driving device according to any one of 7 and 7 . Wherein the support attachment portion is formed on the elastic member, the lens driving device according to any one of claims 1 to 10 has a shape recessed in a U-shape on the inside.   The lens driving device according to claim 1, further comprising a portion in which the width of the elastic member is reduced at an intermediate position of the elastic member from the frame mounting portion toward the support mounting portion. The lens drive device according to claim 7 , wherein the tongue portion is configured to protrude from the support attachment portion toward the optical axis.