JP7381896B2 - Lens drive device, camera module and camera mounting device - Google Patents

Description

The present invention relates to a lens driving device, a camera module, and a camera mounting device.

Generally, mobile terminals such as smartphones are equipped with a small camera module. Such camera modules have an autofocus function (hereinafter referred to as "AF function") that automatically performs autofocus when photographing a subject, and an optical function that suppresses shake (vibration) that occurs during photographing. A lens driving device having an optical image stabilization (OIS) function (hereinafter referred to as "OIS function") that corrects image distortion and reduces image disturbance is applied.

A lens drive device having an AF function and an OIS function includes an autofocus drive unit (hereinafter referred to as “AF drive unit”) for moving the lens unit in the optical axis direction, and an autofocus drive unit for moving the lens unit in the optical axis direction, and an autofocus drive unit for moving the lens unit in the optical axis direction. A shake correction drive section (hereinafter referred to as "OIS drive section") for swinging in a plane orthogonal to the axis is provided. In Patent Document 1, a voice coil motor (VCM) is applied to the AF drive section and the OIS drive section.

For example, the autofocus movable part (hereinafter referred to as "AF movable part") that can move in the optical axis direction during autofocusing is radially moved relative to the autofocus fixed part (hereinafter referred to as "AF fixed part"). placed at a distance. The shake correction movable part (hereinafter referred to as "OIS movable part") that swings in a plane perpendicular to the optical axis during shake correction is composed of an AF unit including an AF movable part, an AF fixed part, and an AF drive part, and includes, for example, It is arranged apart from the shake correction fixing section (hereinafter referred to as "OIS fixing section") in the optical axis direction.

The OIS movable section is connected to the OIS fixed section by, for example, an OIS support section such as a suspension wire, and is capable of swinging within a plane perpendicular to the optical axis. In such a lens driving device, a guaranteed stroke indicating the extent to which shake correction can be performed appropriately is defined. The strength of the suspension wire is designed such that at least problems such as buckling do not occur when the OIS movable part moves within the guaranteed stroke range. Further, the movement of the OIS movable part in the X direction and the Y direction, which are perpendicular to each other, is physically restricted by, for example, the OIS movable part coming into contact with the cover.

Japanese Patent Application Publication No. 2013-210550

However, if only the movement of the OIS movable part in the X and Y directions is restricted as in the past, the movable stroke (physically movable stroke) in the intermediate direction that forms 45 degrees with the X and Y directions is limited. , is √2 times the movable stroke in the X and Y directions (for example, the same as the guaranteed stroke). That is, the OIS movable part is movable beyond the guaranteed stroke in the intermediate direction.
Therefore, if the suspension wire is designed based on the guaranteed stroke, the movement of the OIS movable part in the intermediate direction may cause a load greater than expected to be applied to the suspension wire, resulting in problems such as buckling. On the other hand, if the suspension wire is designed taking into consideration the movable stroke of the OIS movable part in the intermediate direction, the wire diameter may increase, which may impede miniaturization and weight reduction of the lens drive device.

An object of the present invention is to provide a lens drive device, a camera module, and a camera mounting device that can suppress the application of an unexpectedly large load to a suspension wire and improve reliability.

The lens driving device according to the present invention includes:
a first fixed part;
a first movable part disposed apart from the first fixed part in the optical axis direction;
a support part that connects the first fixed part and the first movable part;
A drive unit for moving the first movable unit,
A lens driving device that performs shake correction by moving the first movable part in a plane perpendicular to the optical axis perpendicular to the optical axis direction in response to the driving force of the driving part,
It has a rectangular shape that extends in mutually orthogonal X and Y directions in a plane orthogonal to the optical axis in a plan view from the optical axis direction,
The support part is composed of a suspension wire extending in the optical axis direction,
an XY direction movement restriction part that restricts movement of the first movable part so that a movable stroke of the first movable part in the X direction and the Y direction falls within a range of a first movement stroke L1;
an intermediate direction in which movement of the first movable part is restricted so that a movable stroke of the first movable part in an intermediate direction forming 45 degrees with the X direction and the Y direction falls within a range of a second movement stroke L2; A movement regulation section;
The second movement stroke L2 satisfies L1≦L2<√2×L1,
The intermediate direction movement restriction portion is provided at a position corresponding to four corners of the rectangular shape,
Each of the intermediate direction movement restriction portions is
a fixed-side regulating portion provided on the first fixing portion so as to protrude toward the light-receiving side in the optical axis direction;
a movable side regulating section provided in the first movable section;
The fixed-side regulating portion and the movable-side regulating portion each have intermediate direction opposing surfaces that face each other in the intermediate direction,
The fixed side regulating section is divided into two parts and arranged so as to sandwich the suspension wire therebetween .

The camera module according to the present invention includes:
The above lens driving device,
a lens section attached to the first movable section;
an imaging unit that captures a subject image formed by the lens unit;
Equipped with

The camera-mounted device according to the present invention includes:
A camera-equipped device that is an information device or a transportation device,
The above camera module,
An image processing unit that processes image information obtained by the camera module.

According to the present invention, it is possible to suppress a load that is more than expected from being applied to the suspension wire, and it is possible to improve reliability.

FIG. 1A and FIG. 1B are diagrams showing a smartphone equipped with a camera module according to an embodiment of the present invention. FIG. 2 is an external perspective view of the camera module. FIG. 3 is a perspective view showing the lens driving device with the cover removed. FIG. 4 is an exploded perspective view showing a schematic configuration of the lens driving device. FIG. 5 is an exploded perspective view showing the detailed configuration of the lens driving device. FIG. 6 is an exploded perspective view showing the detailed configuration of the lens driving device. FIG. 7 is a perspective view showing the intermediate direction movement regulating section of the lens driving device. 8A and 8B are plan views showing a movement regulating structure of the lens driving device in a plane orthogonal to the optical axis. 9A and 9B are plan views showing the movable stroke of the lens driving device in a plane orthogonal to the optical axis. FIGS. 10A and 10B are diagrams showing an automobile as a camera mounting device equipped with an in-vehicle camera module.

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

1A and 1B are diagrams showing a smartphone M (an example of a camera-equipped device) equipped with a camera module A according to an embodiment of the present invention. FIG. 1A is a front view of the smartphone M, and FIG. 1B is a rear view of the smartphone M.

In this embodiment, the camera module A is applied to the rear camera OC1 of the smartphone M. Camera module A is equipped with an AF function and an OIS function, and automatically performs autofocus when photographing a subject, as well as optically corrects shake (vibration) that occurs during photographing to photograph images without image blur. be able to.

FIG. 2 is an external perspective view of the camera module A. As shown in FIG. 2, the embodiment will be described using an orthogonal coordinate system (X, Y, Z). The figures to be described later are also shown using a common orthogonal coordinate system (X, Y, Z). Further, intermediate directions forming an angle of 45 degrees with the X direction and the Y direction, that is, diagonal directions in a plan view of the camera module A viewed from the optical axis direction will be described as the U direction and the V direction.

Camera module A is mounted so that when actually taking pictures with smartphone M, the X direction is the vertical direction (or left/right direction), the Y direction is the left/right direction (or up/down direction), and the Z direction is the front/back direction. Ru. In other words, the Z direction is the optical axis direction, and the upper side in the figure is the light receiving side in the optical axis direction (also referred to as the "macro position side"), and the lower side is the imaging side in the optical axis direction (also referred to as the "infinity position side"). . Furthermore, the X direction and Y direction that are orthogonal to the Z axis are referred to as "directions perpendicular to the optical axis."

The camera module A includes a lens driving device 1 that realizes an AF function and an OIS function, a lens section 2 in which a lens is housed in a cylindrical lens barrel, and an imaging section that captures a subject image formed by the lens section 2. Equipped with 3rd class.

The imaging unit 3 is arranged on the imaging side of the lens driving device 1 in the optical axis direction. The imaging unit 3 includes, for example, an image sensor board 41, an image sensor 42, a control unit 43 that controls driving of the lens driving device 1, and the like. The lens driving device 1 is mounted on the image sensor substrate 41 and mechanically and electrically connected to it. The image sensor 42 is configured by, for example, a CCD (charge-coupled device) type image sensor, a CMOS (complementary metal oxide semiconductor) type image sensor, or the like. The image sensor 42 is mounted on the image sensor substrate 41 and captures a subject image formed by the lens unit 2. The control unit 43 performs drive control of the lens drive device 1. The control unit 43 may be mounted on the image sensor board 41 or may be provided on a camera-equipped device (in the embodiment, the smartphone M) on which the camera module A is mounted.

As shown in FIG. 3, the lens driving device 1 includes a cover 25 covering the outside of the driving device main body (numerical symbol omitted). The cover 25 is a square cylinder with a lid and has a rectangular shape when viewed from above in the optical axis direction, and has an opening 251 on the top surface. The lens portion 2 faces the outside through this opening 251. The cover 25 is fixed to the base 21 of the lens driving device 1, for example, by adhesive. That is, the lens driving device 1 has a rectangular shape that extends in the X direction and the Y direction when viewed in plan from the optical axis direction. In the following description, "planar view" means a planar view viewed from the optical axis direction.

FIG. 4 is an exploded perspective view showing a schematic configuration of the lens driving device 1. As shown in FIG. 5 and 6 are exploded perspective views showing the detailed configuration of the lens driving device 1. FIG. Note that in FIGS. 4 to 6, the cover 25 is omitted.
Functionally, as shown in FIG. 4, the lens drive device 1 includes an OIS movable part M1, an OIS fixed part F1, an OIS drive part D1, an OIS support part S1, an AF movable part M2, an AF fixed part F2, and an AF It includes a drive section D2 and an AF support section S2.

The OIS movable part M1 is a part that receives the driving force of the OIS drive part D1 and swings in a plane perpendicular to the optical axis during shake correction, and in this embodiment, the AF movable part M2, the AF fixed part F2, and the AF It is composed of an AF unit including a drive section D2 and an AF support section S2.
The OIS fixed part F1 is a part that supports the OIS movable part M1, and in this embodiment, is composed of a base 21. For example, the OIS fixed part F1 is arranged apart from the OIS movable part M1 on the imaging side in the optical axis direction.
The OIS support portion S1 is a portion that connects the OIS movable portion M1 and the OIS fixed portion F1, and supports the OIS movable portion M1 so as to be swingable within a plane orthogonal to the optical axis. In this embodiment, the OIS support portion S1 is composed of suspension wires 24 arranged at the four corners.
The OIS drive section D1 is composed of OIS coils 23A to 23D arranged in the OIS fixed part F1 and drive magnets 14A to 14D (OIS magnets) arranged in the OIS movable part M1. That is, a moving magnet type voice coil motor is applied to the OIS drive unit D1. Note that the OIS drive unit D1 may be configured with a moving coil type voice coil motor.

The AF movable section M2 is a section that moves in the optical axis direction upon receiving the driving force of the AF drive section D2 during autofocus, and is configured by the lens holder 11 in this embodiment.
The AF fixed part F2 is a part that supports the AF movable part M2, and in this embodiment, it is composed of a magnet holder 12. The AF fixed part F2 is, for example, arranged apart from the AF movable part M2 radially outward.
The AF support part S2 is a part that connects the AF movable part M2 and the AF fixed part F2, and in this embodiment, the upper elastic support member 15 arranged on the light receiving side (upper side) in the optical axis direction and the optical axis direction coupling part. and a lower elastic support member 16 disposed on the image side (lower side).
The AF drive section D2 is a section that drives the AF movable section M2 during autofocus, and in this embodiment, the AF coil 13 disposed on the AF movable section M2 and the drive coil 13 disposed on the AF fixed section F2. It is composed of magnets 14A to 14D (AF magnets). That is, a moving coil type voice coil motor is applied to the AF drive section D2 of this embodiment. Note that the AF drive unit D2 may be configured with a moving magnet type voice coil motor.

In the lens driving device 1, a guaranteed stroke indicating the extent to which shake correction can be performed appropriately is defined. That is, the shape, size, strength, etc. of the constituent members of the OIS movable part M1, the OIS fixed part F1, the OIS drive part D1, and the OIS support part S1 are set so as to realize a guaranteed stroke.

Structurally, as shown in FIGS. 5 and 6, the lens driving device 1 includes a lens holder 11, a magnet holder 12, an AF coil 13, driving magnets 14A to 14D, an upper elastic support member 15, and a lower elastic support member 15. It includes an elastic support member 16, a base 21, a coil substrate 22, OIS coils 23A to 23D, a suspension wire 24, and the like.

The lens holder 11 is a member that functions as an AF movable part M2, and holds the lens part 2 (see FIG. 2) in a cylindrical lens housing part 111. The lens portion 2 is fixed to the lens housing portion 111 by adhesive or screwing. In this embodiment, the lens holder 11 has an approximately octagonal outer shape in plan view. Furthermore, an AF coil 13 is attached to the peripheral surface of the lens holder 11.

The lens holder 11 has an upper spring fixing part 1112 on the upper surface (the upper end surface of the lens accommodating part 111) to which the upper elastic support member 15 is fixed. The upper spring fixing portion 112 is provided with, for example, a positioning boss (not shown) that protrudes toward the light receiving side in the optical axis direction, and the upper elastic support member 15 is positioned by this positioning boss.

The lens holder 11 has a lower spring fixing part 113 on the lower surface to which the lower elastic support member 16 is fixed. The lower spring fixing portion 113 is provided with, for example, a positioning boss (not shown) that protrudes toward the imaging side in the optical axis direction, and the lower elastic support member 16 is positioned by this positioning boss.

Further, the lens holder 11 has a binding portion 114 on the top surface to which the end of the AF coil 13 is connected. Further, the lens holder 11 has a convex portion 115 on the upper part of the outer peripheral surface of the lens accommodating portion 111, which protrudes outward in the radial direction. In this embodiment, convex portions 115 are provided at four locations facing each other in the X direction and the Y direction.

The magnet holder 12 is a holding member that has a substantially rectangular cylindrical shape in plan view and has four side walls 122 connected to each other. The magnet holder 12 has an opening 121 in which a portion corresponding to the generally octagonal outer shape of the lens holder 11 in plan view is cut out.

The magnet holder 12 has a magnet holding part 123 inside the connecting part of the four side walls 122 (four corners of the magnet holder 12). The driving magnets 14A to 14D are fixed to the magnet holding portion 123. For example, the magnet holding part 123 is provided with an opening (not shown) communicating with the outside, so that an adhesive can be injected into the contact surface between the magnet holding part 123 and the driving magnets 14A to 14D.

The magnet holder 12 has a wire insertion part 124 that is recessed in an arc shape radially inward above the connecting part on the outer peripheral surface of the side wall 122. The suspension wire 24 is arranged in the wire insertion part 124. By providing the wire insertion portion 124, it is possible to avoid interference between the suspension wire 24 and the magnet holder 12 when the OIS movable portion M1 swings.

The magnet holder 12 has an upper spring fixing part 126 on the upper surface of the side wall 122 for fixing the upper elastic support member 15 . In the upper spring fixing part 126, the periphery of the wire insertion part 124 is formed to be recessed below the mounting surface of the upper elastic support member 15, so that a gap is formed when the upper elastic support member 15 is attached. It has become.
The magnet holder 12 also has a lower spring fixing portion 127 on the lower surface of the side wall 122 for fixing the lower elastic support member 16 .

The magnet holder 12 has a recess 125 at a position corresponding to the projection 115 of the lens holder 11 on the upper part of the side wall 122, which is recessed from the light receiving side in the optical axis direction toward the imaging side. When the lens holder 11 moves to the imaging side in the optical axis direction, the convex part 115 of the lens holder 11 is locked to the concave part 125 of the magnet holder 12, so that the lens holder 11 moves towards the imaging side in the optical axis direction. is regulated.

Further, on the upper surface of the magnet holder 12, a plurality of protrusions 128 are provided that protrude toward the light receiving side in the optical axis direction. By providing the protrusion 128, it is possible to avoid direct collision between the cover 25 and the main part of the lens drive device 1 when an external force in the optical axis direction is applied due to a fall, etc., thereby suppressing failure of the lens drive device 1. can do.

Furthermore, the magnet holder 12 has a movable side regulating part 129 that regulates movement of the OIS movable part M1 in the U direction and the V direction. The movable side restriction section 129 constitutes the intermediate direction movement restriction section 52 together with the fixed side restriction section 212 of the base 21 (see FIG. 7).
In the present embodiment, the movable side regulating section 129 is located on the outer circumferential surface of the side wall 122 at the lower part of the connecting section (below the wire insertion section 124) and inside the outer shape of the magnet holder 12 (on the optical axis side). It is recessed into the The movable side regulating portion 129 has an intermediate direction facing surface 129a perpendicular to the U direction or the V direction, and an optical axis direction facing surface 129b perpendicular to the optical axis direction.

The AF coil 13 is an air-core coil that is energized during autofocus, and is wound around the outer peripheral surface of the coil winding portion of the lens holder 11. The AF coil 13 constitutes a voice coil motor that functions as an AF drive section D2 together with the drive magnets 14A to 14D. Both ends of the AF coil 13 are tied to the binding portions 114 of the lens holder 11, respectively. The AF coil 13 is energized, for example, via the suspension wire 24 and the upper elastic support member 15. The current flowing through the AF coil 13 is controlled by the control unit 43, for example.

The driving magnets 14A to 14D are fixed to the magnet holding portion 123 of the magnet holder 12 by, for example, adhesive. In this embodiment, the drive magnets 14A to 14D have a substantially isosceles trapezoidal shape when viewed from above. Thereby, the space at the corner of the magnet holder 12 (magnet holding section 123) can be effectively utilized.

The drive magnets 14A to 14D are spaced apart from the AF coil 13 in the radial direction, and spaced apart from the OIS coils 23A to 23D in the optical axis direction. The driving magnets 14A to 14D are attached so as to form a magnetic field that crosses the AF coil 13 in the radial direction (U direction or V direction) and the OIS coils 23A to 23D in the optical axis direction (Z direction). be magnetized. The driving magnets 14A to 14D together with the AF coil 13 constitute a voice coil motor that functions as an AF driving section D2. Further, the driving magnets 14A to 14D constitute a voice coil motor that functions as an OIS driving section D1 together with the OIS coils 23A to 23D. That is, in this embodiment, the drive magnets 14A to 14D serve both as AF magnets and OIS magnets.

The upper elastic support member 15 elastically supports the lens holder 11, which is the AF movable part M2, on the light receiving side in the optical axis direction with respect to the magnet holder 12, which is the AF fixed part F2. The upper elastic support member 15 is made of, for example, titanium copper, nickel copper, stainless steel, or the like. The upper elastic support member 15 as a whole has a rectangular shape in plan view, that is, the same shape as the magnet holder 12 . The upper elastic support member 15 is composed of two leaf springs, and is arranged on the magnet holder 12 so as not to contact each other. The upper elastic support member 15 is formed, for example, by etching a sheet metal.

The upper elastic support member 15 has a lens holder fixing part 151 fixed to the lens holder 11, a magnet holder fixing part 152 fixed to the magnet holder 12, and an arm part 153 that elastically deforms as the lens holder 11 moves.

The lens holder fixing part 151 has a shape corresponding to the upper spring fixing part 112 of the lens holder 11. The lens holder fixing part 151 is displaced together with the lens holder 11 when the lens holder 11 moves in the optical axis direction. The magnet holder fixing part 152 has a shape corresponding to the upper spring fixing part 126 of the magnet holder 12. The arm part 153 connects the lens holder fixing part 151 and the magnet holder fixing part 152. The arm portion 153 has a curved shape and is easily elastically deformed when the lens holder 11 moves.

The upper elastic support member 15 is positioned relative to the lens holder 11 and the magnet holder 12, and fixed, for example, by adhesive. A part of the lens holder fixing part 151 is electrically connected to the AF coil 13 wrapped around the binding part 114 of the lens holder 11, for example, by soldering. Further, an end (corner) of the magnet holder fixing part 152 is connected to the suspension wire 24 (wire connection part 154). The upper elastic support member 15 forms a power feeding path from the terminal fitting 27 to the AF coil 13 together with the suspension wire 24 .

The lower elastic support member 16 elastically supports the lens holder 11, which is the AF movable part M2, on the imaging side in the optical axis direction with respect to the magnet holder 12, which is the AF fixed part F2. The lower elastic support member 16 is made of, for example, titanium copper, nickel copper, stainless steel, or the like. The lower elastic support member 16 has an overall rectangular shape in plan view, that is, the same shape as the magnet holder 12 . The lower elastic support member 16 is formed, for example, by etching a sheet metal.

The lower elastic support member 16 has a lens holder fixing part 161 fixed to the lens holder 11, a magnet holder fixing part 162 fixed to the magnet holder 12, and an arm part 163 that elastically deforms as the lens holder 11 moves. .

The lens holder fixing part 161 has a shape corresponding to the lower spring fixing part 113 of the lens holder 11. The lens holder fixing part 161 is displaced together with the lens holder 11 when the lens holder 11 moves in the optical axis direction. The magnet holder fixing part 162 has a shape corresponding to the upper spring fixing part 128 of the magnet holder 12. The arm part 163 connects the lens holder fixing part 161 and the magnet holder fixing part 162. The arm portion 163 has a curved shape and is easily elastically deformed when the lens holder 11 moves.
The lower elastic support member 16 is positioned relative to the lens holder 11 and the magnet holder 12, and fixed, for example, by adhesive.

The base 21 has a rectangular shape in plan view, and has a circular opening 211 formed in the center. In the camera module A, an image sensor board 41 on which an image sensor 42 is mounted is arranged on the imaging side of the base 21 in the optical axis direction.

Terminal fittings 26 and 27 are embedded in the base 21 by, for example, insert molding.
The terminal fitting 26 is electrically connected to the wiring pattern of the image sensor board 41, and serves as a power line for supplying power to the OIS coils 23A to 23D and the magnetic sensors 31A and 31B, as well as a detection output from the magnetic sensors 31A and 31B. Form a signal line for signals.
The terminal fittings 27 are exposed from the four corners of the base 21 and are connected to the other end of the suspension wire 24 by soldering. Two of the four terminal fittings 27 are electrically connected to the wiring pattern of the image sensor board 41 and form a power line for feeding power to the AF coil 13.

Further, the base 21 has a fixed side regulating section 212 that regulates movement of the OIS movable section M1 in the U direction and the V direction. The fixed side restriction section 212 constitutes the intermediate direction movement restriction section 52 together with the movable side restriction section 129 of the magnet holder 12 (see FIG. 7).
In this embodiment, the fixed side regulating portions 212 are provided at the four corners of the base 21 so as to protrude toward the light receiving side in the optical axis direction. The fixed side regulating portion 212 has, for example, a triangular prism shape, and has an intermediate direction facing surface 212a perpendicular to the U direction or the V direction, and an optical axis direction facing surface 212b perpendicular to the optical axis direction. Note that in the present embodiment, two fixed-side regulating portions 212 are arranged to sandwich the suspension wire 24 in one corner, but the form of the fixed-side regulating portions 212 is not limited to this. . For example, the intermediate direction opposing surfaces 212a of the two fixed-side regulating portions 212 may be connected.

The intermediate direction opposing surface 212a faces the intermediate direction opposing surface 129a of the magnet holder 12 in the U direction or the V direction. When the OIS movable portion M1 swings in a plane perpendicular to the optical axis, the intermediate direction opposing surfaces 129a and 212a come into contact with each other, thereby restricting movement of the OIS movable portion M1 in the U direction and the V direction.
Further, the optical axis direction opposing surface 212b opposes the optical axis direction opposing surface 129b of the magnet holder 12 in the optical axis direction. The distance between the opposing surfaces 212b and 129b in the optical axis direction is set smaller than the distance between the OIS movable part M1 and the OIS fixed part F1. This makes it possible to avoid direct collision between the main parts of the lens drive device 1 (for example, the OIS coils 23A to 23D and the drive magnets 14A to 14D, etc.) when an external force in the optical axis direction is applied due to a fall or the like. , failure of the lens driving device 1 can be suppressed.

Like the base 21, the coil substrate 22 is a rectangular substrate in plan view, and has a circular opening 221 in the center. The coil board 22 has a wiring pattern (not shown) including a power line for feeding power to the OIS coils 23A to 23D and the magnetic sensors 31A and 31B, and a signal line for detection signals output from the magnetic sensors 31A and 31B. have The wiring pattern is electrically connected to a terminal fitting 26 arranged on the base 21.

The OIS coils 23A to 23D are arranged at positions facing the driving magnets 14A to 14D in the optical axis direction. The OIS coils 23A to 23D are built inside the coil substrate 22, for example, in the manufacturing process of the coil substrate 22.

The OIS coils 23A to 23D are air-core coils that are energized during shake correction. The radial edges of the driving magnets 14A to 14D fit within the coil cross-sectional width of each of the OIS coils 23A to 23D, that is, the magnetic field radiated from the bottom surface of the driving magnets 14A to 14D is connected to the OIS coils 23A to 23D. The size and arrangement of the OIS coils 23A to 23D and the driving magnets 14A to 14D are set so that they cross two opposing sides of the OIS coil 23D and return to the driving magnets 14A to 14D. Here, the OIS coils 23A to 23D have the same planar shape as the drive magnets 14A to 14D (here, approximately isosceles trapezoid shape). Thereby, it is possible to efficiently generate a driving force (electromagnetic force) for swinging the OIS movable part M1 in a plane perpendicular to the optical axis. The current flowing through the OIS coils 23A to 23D is controlled by the control unit 43, for example.

The OIS coils 23A and 23C arranged opposite to each other in the U direction and the OIS coils 23B and 23D arranged opposite to each other in the V direction are connected to each other, and the same current is applied to them. The driving magnets 14A, 14C and the OIS coils 23A, 23C constitute an OIS voice coil motor that swings the OIS movable part M1 in the U direction. Further, the driving magnets 14B and 14D and the OIS coils 23B and 23D constitute an OIS voice coil motor that swings the OIS movable part M1 in the V direction.

Magnetic sensors 31A and 31B are mounted on the lower surface of the coil substrate 22. The magnetic sensors 31A and 31B are comprised of, for example, a Hall element or a TMR (Tunnel Magneto Resistance) sensor, and are arranged at positions facing the driving magnets 14A and 14B, respectively, in the optical axis direction. In this embodiment, the magnetic sensors 31A and 31B are arranged on the back surface of the air core portions of the OIS coils 23A and 23B, respectively.

By detecting the magnetic field formed by the driving magnets 14A, 14B with the magnetic sensors 31A, 31B, it is possible to specify the position of the OIS movable part M1 in a plane perpendicular to the optical axis. That is, in this embodiment, the magnetic sensors 31A, 31B and the drive magnets 14A, 14B constitute an XY position detection section. Note that a magnet for detecting the XY position of the OIS movable part M1 may be arranged in the OIS movable part M1 separately from the driving magnets 14A and 14B. That is, in this embodiment, the drive magnets 14A and 14B also serve as XY position detection magnets.

The suspension wire 24 is a linear member extending in the optical axis direction, and is elastically deformed as the OIS movable portion M1 swings. One end (the end on the light receiving side in the optical axis direction, the upper end) of the suspension wire 24 is fixed to the OIS movable part M1 (the upper elastic support member 15 in this embodiment), and the other end (the end on the imaging side in the optical axis direction) ) is fixed to the OIS fixing part F1 (base 21 in this embodiment). In this embodiment, two of the four suspension wires 24 are used together with the upper elastic support member 15 as a power feeding path to the AF coil 13.

When performing shake correction in the lens driving device 1, the OIS coils 23A to 23D are energized. Specifically, the OIS drive section energizes the OIS coils 23A to 23D based on a detection signal from a shake detection section (not shown, for example, a gyro sensor) so that the shake of the camera module A is offset. Current is controlled. At this time, by feeding back the detection results of the magnetic sensors 31A and 31B, the swinging of the OIS movable portion M1 can be accurately controlled.

When the OIS coils 23A to 23D are energized, a Lorentz force is generated in the OIS coils 23A to 23D due to the interaction between the magnetic field of the drive magnets 14A to 14D and the current flowing through the OIS coils 23A to 23D (Fleming's left-hand rule). ). The direction of the Lorentz force is a direction (V direction or U direction) perpendicular to the direction of the magnetic field (Z direction) and the direction of current (U direction or V direction) in the long side portions of the OIS coils 23A to 23D. Since the OIS coils 23A to 23D are fixed, a reaction force acts on the drive magnets 14A to 14D. This reaction force becomes a driving force for the OIS voice coil motor, and the OIS movable part M1 having the driving magnets 14A to 14D swings within the XY plane to perform shake correction.

8A and 8B are plan views showing a movement regulating structure of the lens driving device 1 in a plane perpendicular to the optical axis.
As shown in FIGS. 8A and 8B, movement of the OIS movable portion M1 in the X direction and the Y direction is restricted by the contact between the outer surface of the magnet holder 12 and the inner surface of the cover 25. That is, the cover 25 and the magnet holder 12 move the OIS movable part M1 so that the movable stroke of the OIS movable part M1 in the X direction and the Y direction falls within the range of the first movement stroke L1 (for example, guaranteed stroke + 120 μm). An XY direction movement regulating section 51 is configured to regulate the movement of. That is, the inner surface of the cover 25 and the outer surface of the magnet holder 12 are spaced apart by the first movement stroke L1.

On the other hand, the movement of the OIS movable part M1 in the U direction and the V direction (intermediate direction) is caused by moving the movable side regulating part 129 (intermediate direction opposing surface 129a) of the magnet holder 12 and the fixed side regulating part 212 (intermediate direction opposing surface) of the base 21. The surface 212a) is regulated by contact with the surface 212a). That is, the movable side regulating section 129 and the fixed side regulating section 212 regulate the movement of the OIS movable section M1 so that the movable stroke of the OIS movable section M1 in the intermediate direction falls within the range of the second movement stroke L2. An intermediate direction movement restriction section 52 is configured. That is, the intermediate direction opposing surface 129a of the magnet holder 12 and the intermediate direction opposing surface 212a of the base 21 are spaced apart by the second movement stroke L2. The second movement stroke L2 is set to satisfy L1≦L2<√2×L1.

If the intermediate direction movement restriction section 52 is not provided as in a conventional lens driving device, the movable stroke of the OIS movable section M1 in the intermediate direction is √2 times the first movable stroke L1 (see Fig. (See 9B). On the other hand, in the present embodiment, the intermediate direction movement restriction section 52 makes the movable stroke of the OIS movable section M1 in the intermediate direction equal to the first movable stroke L1 (at least less than √2). Thereby, when the OIS movable part M1 swings, it is possible to suppress a load more than expected from being applied to the suspension wire 24. In particular, by setting the second movement stroke L2 to be the same as the first movement stroke L1, it is possible to employ the suspension wire 24 of suitable quality having the minimum characteristics based on the guaranteed stroke, and the lens drive device 1 can be made smaller and lighter.

When performing autofocus in the lens drive device 1, the AF coil 13 is energized. Power is supplied to the AF coil 13 from the base 21 via the suspension wire 24 and the upper elastic support member 15. When the AF coil 13 is energized, a Lorentz force is generated in the AF coil 13 due to the interaction between the magnetic fields of the drive magnets 14A to 14D and the current flowing through the AF coil 13. The direction of the Lorentz force is a direction (Z direction) orthogonal to the direction of the magnetic field by the drive magnets 14A to 14D and the direction of the current flowing through the AF coil 13. Since the drive magnets 14A to 14D are fixed, a reaction force acts on the AF coil 13. This reaction force becomes a driving force for the AF voice coil motor, and the lens holder 11 (AF movable part M2) in which the AF coil 13 is arranged moves in the optical axis direction, thereby performing autofocus.

Note that when power is not applied and autofocus is not performed, the AF movable part M2 (lens holder 11) is moved between the infinity position and the macro position by, for example, the AF support part S2 (upper elastic support member 15 and lower elastic support member 16). (hereinafter referred to as the "reference state"). That is, the AF movable part M2 is elastically supported by the AF support part S2 so that it can be displaced to both sides in the Z direction while being positioned with respect to the AF fixed part F2 (magnet holder 12). When performing autofocus, the direction of the current is controlled depending on whether the lens holder 11 is moved from the reference state toward the macro position or toward the infinity position. Further, the magnitude of the current is controlled depending on the moving distance (stroke) of the lens holder 11 from the reference state.

In this way, the lens driving device 1 includes an OIS fixed part F1 (first fixed part) and an OIS movable part M1 (first movable part) arranged apart from the OIS fixed part F1 in the optical axis direction. , an OIS support part S1 (support part) that connects the OIS fixed part F1 and the OIS movable part M1, and an OIS drive part D1 (drive part) for moving the OIS movable part M1, and includes an OIS drive part D1. In response to the driving force, the OIS movable part M1 moves in a plane perpendicular to the optical axis, thereby performing shake correction.
The OIS support part S1 is composed of a suspension wire 24 extending in the optical axis direction, and the movable stroke of the OIS movable part M1 in the mutually orthogonal X direction and Y direction in the plane perpendicular to the optical axis is a first movement stroke L1. The XY-direction movement regulating section 51 regulates the movement of the OIS movable section M1 so that the movement of the OIS movable section M1 is within the range of An intermediate direction movement restriction part 52 is provided to restrict movement of the OIS movable part M1 so that the possible stroke falls within the range of the second movement stroke L2. The second movement stroke L2 is set to satisfy L1≦L2<√2×L1.

According to the lens driving device 1, when the OIS movable part M1 swings, it is possible to suppress a load that is more than expected from being applied to the suspension wire 24. Therefore, the reliability of the lens driving device 1 is improved.

Further, the lens driving device 1 has a rectangular shape that extends in the X direction and the Y direction in a plan view from the optical axis direction, and the intermediate direction movement regulating portions 52 are provided at positions corresponding to the four corners of the rectangular shape. There is.
Thereby, the dead space around the suspension wire 24 can be effectively utilized to restrict the movement of the OIS movable portion M1 in the intermediate direction.

Furthermore, in the lens driving device 1, the intermediate direction movement regulating section 52 has a fixed side regulating section 212 provided on the OIS fixed section F1 so as to protrude toward the light receiving side in the optical axis direction, and the outer shape of the OIS movable section M1 in a plan view. A movable-side regulating portion 129 is provided on the OIS movable portion M1 so as to be recessed inwardly. 129a.
Thereby, the movement of the OIS movable part M1 is regulated by the surface contact between the intermediate direction opposing surfaces 212a and 129a, so that the movement of the OIS movable part M1 in the intermediate direction can be reliably regulated.

Further, in the lens driving device 1, the OIS movable section M1 has an AF movable section M2 (second movable section) that is movable in the optical axis direction, and the fixed side regulating section 212 and the movable side regulating section 129 each have a It has optical axis direction opposing surfaces 212b and 129b that face each other in the optical axis direction.
This makes it possible to avoid direct collision between the main parts of the lens drive device 1 (for example, the OIS coils 23A to 23D and the drive magnets 14A to 14D, etc.) when an external force in the optical axis direction is applied due to a fall or the like. , failure of the lens driving device 1 can be suppressed.

Further, in the lens driving device 1, the first movement stroke L1 and the second movement stroke L2 are the same. Thereby, it is possible to employ the suspension wire 24 of suitable quality that has the minimum characteristics based on the guaranteed stroke, and it is possible to reduce the size and weight of the lens driving device 1.

As above, the invention made by the present inventor has been specifically explained based on the embodiments, but the present invention is not limited to the above embodiments, and can be modified without departing from the gist thereof.

For example, in the embodiment, the smartphone M, which is a camera-equipped mobile terminal, is cited as an example of a camera-equipped device equipped with a camera module A, but the present invention is applicable to a camera-equipped device that is an information device or a transportation device. can. A camera-equipped device, which is an information device, is an information device that has a camera module and a control unit that processes image information obtained by the camera module, and includes, for example, a camera-equipped mobile phone, a notebook computer, a tablet terminal, and a portable game device. , web cameras, and in-vehicle devices with cameras (for example, back monitor devices, drive recorder devices). Further, a camera-equipped device that is a transportation device is a transportation device that has a camera module and a control unit that processes images obtained by the camera module, and includes, for example, a car.

FIG. 10A and FIG. 10B are diagrams showing an automobile V as a camera mounting device equipped with a vehicle camera module VC (Vehicle Camera). 10A is a front view of the automobile V, and FIG. 10B is a rear perspective view of the automobile V. The automobile V is equipped with the camera module A described in the embodiment as the in-vehicle camera module VC. As shown in FIGS. 10A and 10B, the in-vehicle camera module VC is attached, for example, to a windshield facing forward, or to a rear gate facing rearward. This in-vehicle camera module VC is used for back monitors, drive recorders, collision avoidance control, automatic driving control, and the like.

Further, for example, the configuration of the intermediate direction movement restriction section is not limited to that described in the embodiment, and can be changed as appropriate. For example, the fixed-side regulating section that constitutes the intermediate direction movement regulating section may be provided on the cover 25 instead of the base 21.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1 Lens drive device 2 Lens section 11 Lens holder 12 Magnet holder 13 AF coil 14A-14D Drive magnet 15 Upper elastic support member 16 Lower elastic support member 21 Base 22 Coil board 23A-23D OIS coil 24 Suspension wire 51 XY Directional movement regulation section 52 Intermediate direction movement regulation section D1 OIS drive section (drive section)
F1 OIS fixing part (first fixing part)
M1 OIS moving part (first moving part)
S1 OIS support part (support part)
M Smartphone A Camera module

Claims (8)

a first fixed part;
a first movable part disposed apart from the first fixed part in the optical axis direction;
a support part that connects the first fixed part and the first movable part;
A drive unit for moving the first movable unit,
A lens driving device that performs shake correction by moving the first movable part in a plane perpendicular to the optical axis perpendicular to the optical axis direction in response to the driving force of the driving part,
It has a rectangular shape that extends in mutually orthogonal X and Y directions in a plane orthogonal to the optical axis in a plan view from the optical axis direction,
The support part is composed of a suspension wire extending in the optical axis direction,
an XY direction movement restriction part that restricts movement of the first movable part so that a movable stroke of the first movable part in the X direction and the Y direction falls within a range of a first movement stroke L1;
an intermediate direction in which movement of the first movable part is restricted so that a movable stroke of the first movable part in an intermediate direction forming 45 degrees with the X direction and the Y direction falls within a range of a second movement stroke L2; A movement regulation section;
The second movement stroke L2 satisfies L1≦L2<√2×L1,
The intermediate direction movement restriction portion is provided at a position corresponding to four corners of the rectangular shape,
Each of the intermediate direction movement regulating portions is
a fixed-side regulating portion provided on the first fixing portion so as to protrude toward the light-receiving side in the optical axis direction;
a movable side regulating section provided in the first movable section;
The fixed-side regulating part and the movable-side regulating part each have intermediate direction opposing surfaces that face each other in the intermediate direction,
The fixed side regulating part is divided into two parts and arranged so as to sandwich the suspension wire.
Lens drive device. The movable side regulating portion is provided so as to be recessed inward from the outer shape of the first movable portion in a plan view,
The fixed-side regulating part and the movable-side regulating part each have optical axis direction opposing surfaces that face each other in the optical axis direction,
The separation distance between the optical axis direction opposing surface of the fixed side regulation part and the optical axis direction opposing surface of the movable side regulation part is smaller than the separation distance between the first fixed part and the first movable part.
The lens driving device according to claim 1. The driving part is arranged in an exposed state in at least one of the first fixed part and the first movable part,
The separation distance between the first fixed part and the first movable part is the separation distance between the part where the drive part is arranged,
The lens driving device according to claim 2. The driving section includes a coil disposed on the first fixed section, and a magnet disposed on the first movable section facing the coil in the optical axis direction,
The distance between the first fixed part and the first movable part is the distance between the parts where the coil and the magnet are arranged.
The lens driving device according to claim 3. The first movable part has a second movable part movable in the optical axis direction,
The lens driving device according to any one of claims 1 to 4 . The lens drive device according to any one of claims 1 to 5 , wherein the first movement stroke L1 and the second movement stroke L2 are the same. The lens driving device according to any one of claims 1 to 6 ,
a lens section attached to the first movable section;
an imaging unit that captures a subject image formed by the lens unit;
A camera module with. A camera-equipped device that is an information device or a transportation device,
A camera module according to claim 7 ,
an image processing unit that processes image information obtained by the camera module;
A camera-equipped device equipped with a camera.