JP7553843B2 - Lens drive device, camera module, and camera-mounted device - Google Patents

Description

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

Generally, mobile terminals such as smartphones are equipped with small camera modules. Such camera modules are equipped with a lens drive device that has an autofocus function (hereinafter referred to as the "AF function"; AF: Auto Focus) that automatically adjusts the focus when photographing a subject, and an image stabilization function (hereinafter referred to as the "OIS function"; OIS: Optical Image Stabilization) that optically corrects shakes (vibrations) that occur during photography to reduce image distortion (e.g., Patent Documents 1 to 3).

The lens driving devices disclosed in Patent Documents 1 to 3 include an autofocus driving device that moves a lens unit in the optical axis direction, and a shake correction driving device that moves autofocus elements including the autofocus driving device in a plane perpendicular to the optical axis direction. The autofocus driving device is placed on the movable stage of the shake correction driving device, and is mechanically and electrically connected to a fixed part of the shake correction driving device via a flexible printed circuit board.

Special table 2017-522615 publication Special table 2015-537247 publication Patent No. 6289451

In the lens driving devices disclosed in Patent Documents 1 to 3, etc., the autofocus driving device and the shake correction driving device are connected via a flexible printed circuit board, and the movement operation during shake correction is restricted to a certain extent by the flexible printed circuit board. In particular, when the flexible printed circuit board has a multi-layer structure, sufficient flexibility is not obtained, and the movement operation during shake correction is hindered, and there is a risk that shake correction will not be performed normally.
An object of the present invention is to provide a lens driving device, a camera module, and a camera-mounted device that can alleviate restrictions on movement during shake correction by a flexible printed circuit board and perform normal shake correction.

The lens driving device according to the present invention comprises:
a fixing portion having a rectangular shape in a plan view from the optical axis direction and having an upright wall formed to protrude in the optical axis direction;
a movable portion configured to be able to hold a lens portion and connected to the fixed portion so as to be able to move in the optical axis direction;
A drive source that moves the movable part;
a flexible printed circuit board for supplying power to the driving source;
The flexible printed circuit board is
A first substrate portion having a substrate surface fixed to a wall surface of the upright wall;
a second substrate portion connected to the first substrate portion and at least a portion of which is spaced apart from the standing wall in a direction perpendicular to the optical axis direction,
An electronic component is disposed on the first substrate portion ,
the second substrate portion has a bent portion that extends along the rectangular shape,
The bent portion is spaced apart from the upright wall .

The camera module according to the present invention comprises:
The lens driving device,
A lens unit attached to the movable part;
an imaging section that captures the subject image formed by the lens section.

The camera-mounted device according to the present invention comprises:
A camera-equipped device that is an information device or a transport device,
The camera module described above;
and an image processing unit that processes image information obtained by the camera module.

The present invention can alleviate restrictions on movement during shake correction by flexible printed circuit boards in lens driving devices, camera modules, and camera-mounted devices, allowing shake correction to be performed normally.

1A and 1B are diagrams showing a smartphone equipped with a camera module according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the camera module. FIG. 3 is an exploded perspective view of the AF lens driving section. FIG. 4 is an exploded perspective view of the AF lens driving section. 5A to 5C are perspective views showing the structure of the base. 6A and 6B are perspective views of a flexible printed circuit board. 7A and 7B are plan views showing the attached state of the flexible printed circuit board. 8A and 8B are diagrams showing an automobile as a camera-mounted device equipped with an on-board camera module.

The following describes in detail the embodiment of the present invention with reference to the drawings.

1A and 1B are diagrams showing a smartphone M (camera-mounted device) equipped with a camera module A according to one 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.

The smartphone M is equipped with a camera module A, for example as a rear camera OC. The camera module A has an AF function and an OIS function, and can automatically adjust the focus when photographing a subject, and can optically correct shaking (vibration) that occurs during shooting to capture images without blur.

Figure 2 is an exploded perspective view of camera module A. As shown in Figure 2, in this embodiment, the description will be given using a Cartesian coordinate system (X, Y, Z). The same Cartesian coordinate system (X, Y, Z) will also be used in the figures described below.

When actually taking a picture with smartphone M, camera module A is mounted so that the X direction is the up-down 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. That is, the Z direction is the optical axis direction, with the upper side in the figure being the light receiving side in the optical axis direction and the lower side being the image forming side in the optical axis direction. In addition, the X and Y directions perpendicular to the Z axis are referred to as the "optical axis perpendicular direction", and the XY plane is referred to as the "optical axis perpendicular plane".

As shown in FIG. 2, the camera module A includes an AF lens driving device 1 that realizes the AF function, an OIS lens driving device 2 that realizes the OIS function, a lens unit 3 having a lens housed in a cylindrical lens barrel, and an imaging unit (not shown) that captures the subject image formed by the lens unit 3.
The AF lens driving device 1 and the OIS lens driving device 2 are configured independently, and the camera module A can be assembled using the AF lens driving device 1 and the OIS lens driving device 2 which are manufactured separately.

The imaging unit (not shown) is disposed on the image-forming side in the optical axis direction of the OIS lens driving device 2. The imaging unit has, for example, an image sensor board and an imaging element mounted on the image sensor board. The imaging element is, for example, configured with a charge-coupled device (CCD) type image sensor, a complementary metal oxide semiconductor (CMOS) type image sensor, or the like. The imaging element captures the subject image formed by the lens unit 3.
In addition, a control unit that controls the driving of the AF lens driving device 1 and the OIS lens driving device 2 may be provided on the image sensor board of the imaging unit, or may be provided in a camera-mounted device (in this embodiment, a smartphone M) on which the camera module A is mounted.

The OIS lens driving device 2 is mounted on, for example, an image sensor substrate (not shown) of the imaging unit, and is mechanically and electrically connected to it. The OIS lens driving device 2 has an OIS movable part 21, an OIS fixed part 22, and an OIS driving part (not shown). The OIS movable part 21 is connected to the OIS fixed part 22 so as to be movable within a plane perpendicular to the optical axis. The OIS driving part is a driving source for moving the OIS movable part 21 within a plane perpendicular to the optical axis, and for example, a driving means using a voice coil motor (VCM), an ultrasonic motor (USM), or a shape memory alloy (SMA) (see Patent Documents 1 to 3) can be applied. Also, for example, a tilt type driving means may be applied to the OIS driving part.

The AF lens driving device 1 is fixed to the OIS movable part 21 of the OIS lens driving device 2, and is configured to be movable together with the OIS movable part 21 in a plane perpendicular to the optical axis. The AF lens driving device 1 is mechanically and electrically connected to, for example, the OIS fixed part 22 via a flexible printed circuit board 15 (hereinafter referred to as "FPC 15"). Note that the FPC 15 may be mechanically and electrically connected to the image sensor board on which the OIS lens driving device 2 is mounted.

Figures 3 and 4 are exploded perspective views of the AF lens driving device 1. Figure 3 is an upper perspective view, and Figure 4 is a lower perspective view.

As shown in Figures 3 and 4, the AF lens driving device 1 includes an AF movable part 11, an AF fixed part 12, an AF driving part 13, an AF support part 14, an FPC 15, etc. In this embodiment, a voice coil motor is applied to the AF lens driving device 1 as the AF driving part 13.

The AF movable part 11 is a part that moves in the optical axis direction relative to the AF fixed part 12 during focusing. In this embodiment, an AF coil 131 constituting the AF drive part 13 is attached to the AF movable part 11.
The AF fixed portion 12 is a portion that supports the AF movable portion 11 via the AF support portion 14. In this embodiment, the AF fixed portion 12 has drive magnets 132A and 132B (AF magnets) that constitute the AF drive portion 13 attached thereto.
That is, the AF drive unit 13, which is the drive source of the AF lens drive device 1, employs a moving coil system.

The AF movable portion 11 is disposed radially apart from the AF fixed portion 12 and is connected to the AF fixed portion 12 by an AF support portion 14 .
In this embodiment, the AF movable part 11 is composed of a lens holder (hereinafter referred to as "lens holder 11"). The AF fixed part 12 is composed of a base 121 and a yoke 122. The AF support part 14 is composed of an upper spring 141 that supports the lens holder 11 on the light receiving side (upper side) in the optical axis direction relative to the AF fixed part 12, and lower springs 142A and 142B that support the lens holder 11 on the image forming side (lower side) in the optical axis direction relative to the AF fixed part 12.

The lens holder 11 is formed of a resin material such as liquid crystal polymer (LCP). The lens holder 11 is formed in a rectangular shape (here, a square shape) in a plan view, and has a lens housing portion 11a in the center. The lens portion 3 (see FIG. 2) is fixed to the lens housing portion 11a by screwing and bonding. An upper spring 141 is fixed to the peripheral portion 11b on the light receiving side in the optical axis direction of the lens housing portion 11a (hereinafter referred to as "upper spring fixing portion 11b"). The upper spring fixing portion 11b is provided with four positioning pieces 11c that protrude to the light receiving side in the optical axis direction. The upper spring 141 is positioned by the positioning pieces 11c.

Lower springs 142A and 142B are fixed to the peripheral portion 11d on the optical axis direction imaging side of the lens housing portion 11a (hereinafter referred to as "lower spring fixing portion 11d"). The lower spring fixing portion 11d is provided with a positioning piece 11e that protrudes on the optical axis direction imaging side. The lower springs 142A and 142B are positioned by the positioning piece 11e.

The AF coil 131 is wound around the side 11f of the lens housing section 11a (hereinafter referred to as "coil winding section 11f"). The coil winding section 11f is formed in a rectangular shape overall, and is partially provided with a notch 11k. The shape of the AF coil 131 is determined by the coil winding section 11f. In addition, the insertion piece 122d of the yoke 122 is inserted between the notch 11k provided in the part of the coil winding section 11f along the Y direction and the AF coil 131.

A rotation restricting piece 11g is provided at approximately the center in the longitudinal direction of the two outer parts along the X direction of the lens holder 11. A magnet storage portion 11h is provided on one side of the rotation restricting piece 11g, and a counterweight portion 11i is provided on the opposite side. The magnet storage portion 11h and the counterweight portion 11i are each provided at a point-symmetrical position with respect to the optical axis.
In the X direction, the AF coil 131 is disposed between the rotation restricting piece 11g, the magnet housing portion 11h, the counterweight portion 11i and the coil winding portion 11f.

The AF coil 131 is an air-core coil that is energized during focusing. The portion of the AF coil 131 that is aligned along the Y direction faces the drive magnets 132A and 132B. Both ends of the AF coil 131 are respectively wound around the winding portion 11j of the lens holder 11 and electrically connected to the lower springs 142A and 142B. The AF coil 131 is energized via the lower springs 142A and 142B. The current flowing through the AF coil 131 is controlled by the control IC 151 (see FIG. 6B).

Position detection magnets 16A and 16B are placed in the magnet storage section 11h of the lens holder 11. The position detection magnet 16A is placed in one of the magnet storage sections 11h and faces the control IC 151. The position detection magnet 16B is placed in the other magnet storage section 11h. The position detection magnet 16A is used to detect the position of the lens holder 11 in the optical axis direction. The position detection magnet 16B is a dummy magnet that is not used to detect the position of the lens holder 11, and is placed to balance the weight of the lens holder 11 and the magnetic force acting on the lens holder 11, and to stabilize the posture of the lens holder 11.

In this embodiment, the drive magnets 132A, 132B are arranged along the Y direction, and the position detection magnets 16A, 16B are arranged on the sides along the X direction. By arranging the drive magnets 132A, 132B and the position detection magnets 16A, 16B as far apart as possible, the magnetic effect of the drive magnets 132A, 132B on the position detection magnets 16A, 16B can be suppressed. This improves the position detection accuracy in the optical axis direction of the lens holder 11, improving reliability.

In the AF fixing portion 12, the base 121 is formed of a resin material such as liquid crystal polymer (LCP), etc. The base 121 is formed in a rectangular shape (here, a square shape) in a plan view, and has a circular opening 121a in the center.
At the four corners of the base 121, lower springs 142A and 142B are fixed to the surface 121b on the light receiving side in the optical axis direction (hereinafter referred to as "lower spring fixing portion 121b"). The lower spring fixing portion 121b has a positioning boss 121c that protrudes toward the lens holder 11 side (light receiving side in the optical axis direction). The positioning boss 121c determines the position of the lower springs 142A and 142B. In the base 121, the lower spring fixing portion 121b is formed to bulge toward the light receiving side in the optical axis direction more than other portions. This allows the lower springs 142A and 142B to elastically deform toward the image forming side in the optical axis direction, and the lens holder 11 to move toward the image forming side in the optical axis direction.

Yoke attachment pieces 121d and 121e on which the yoke 122 is placed are provided on the lower periphery of the base 121. The yoke 122 is positioned by the yoke attachment pieces 121d and 121e. The yoke 122 is placed on the yoke attachment piece 121d and is fixed, for example by adhesive, in a state where it is fitted into the yoke attachment piece 121e.

The base 121 has an upright wall 121f on the side along the X direction that protrudes toward the light receiving side in the optical axis direction. On each side, the upright wall 121f is divided at approximately the center in the longitudinal direction. The rotation restricting piece 11g of the lens holder 11 is disposed in the space 121g between the two upright walls 121f (hereinafter referred to as the "rotation restricting portion 121g"). The FPC 15 is fixed to the outer surface of one of the upright walls 121f (the front side in FIG. 4), and the yoke 122 is fixed to the outer surface of the other upright wall 121f (the back side in FIG. 4). One of the upright walls 121f has an IC housing portion 121h.

Two terminal fittings 124, 125 and two reinforcing plates 126, 127 are embedded in the base 121 (see FIGS. 5A to 5C). Fig. 5A is an external perspective view of the base 121, Fig. 5B is a see-through perspective view of the base 121, and Fig. 5C is an external perspective view of the terminal fittings 124, 125 and the reinforcing plates 126, 127.
The terminal fittings 124, 125 and the reinforcing plates 126, 127 are formed from a metal material such as a copper foil, and are integrally formed with the base 121 by insert molding.

The terminal fittings 124 and 125 are disposed on one side of the base 121 along the X-direction. One end 124a, 125a and the other end 124b, 125b of the terminal fittings 124, 125 are exposed from the base 121.
One end 124a, 125a of the terminal fittings 124, 125 is soldered to the base fixing parts 142b, 142b of the lower springs 142A, 142B, and is mechanically and electrically connected thereto, and the other end 124b, 125b of the terminal fittings 124, 125 is soldered to the coil power supply terminals 152e, 152f of the FPC 15, and is mechanically and electrically connected thereto.

The reinforcing plates 126 and 127 are arranged on the sides of the base 121 along the Y direction. The reinforcing plates 126 and 127 have yoke mounting portions 126a and 127a. Adhesive is applied to the yoke mounting portions 126a and 127a when the yoke 122 is attached to the base 121. The anchor effect improves the adhesive strength when attaching the yoke 122 to the base 121, improving resistance to drop impact.

The portion of the base 121 along the Y direction is thinner than the portion along the X direction. Even if the thick portion of the base 121 along the X direction is made thinner, a certain level of strength can be ensured because the standing wall 121f is provided. On the other hand, since the driving magnets 132A and 132B are located on the light receiving side in the optical axis direction in the thin portion along the Y direction, it is difficult to provide a reinforcing portion such as the standing wall 121f. In other words, if the portion along the Y direction is made thinner to meet the demand for a lower height, the strength will decrease.
In this embodiment, reinforcing plates 126 and 127 are disposed on the thin portions of the base 121 along the Y direction, thereby ensuring the strength of the base 121 .

That is, in the AF driving device 1, the base 121 has a thick portion (portion along the X direction) and a thin portion (portion along the Y direction) that is thinner than the thick portion, and reinforcing plates 126, 127 are embedded in the thin portion.
This allows the thickness of the base 121 in the Y direction to be reduced, thereby making it possible to reduce the height.

The yoke 122 is made of a magnetic material such as SPC material. The yoke 122 also functions as a housing cover that covers the components of the AF lens driving device 1. By using the yoke 122 as a housing cover, the number of parts is reduced, making it possible to reduce weight and reduce assembly labor.

The yoke 122 is formed in a rectangular shape (here, a square shape) in a plan view, and has a substantially rectangular opening 122a in the center. The lens portion 3 is exposed to the outside from this opening 122a.
At the four corners of the yoke 122, upper springs 141 are fixed to the back surface 122b of the top plate (hereinafter referred to as "upper spring fixing parts 122b"). In the top plate of the yoke 122, the upper spring fixing parts 122 are formed recessed toward the image formation side in the optical axis direction compared to other parts. This allows the arms 141c of the upper springs 141 to elastically deform toward the light receiving side in the optical axis direction, and the lens holder 11 to move toward the light receiving side in the optical axis direction.

In the yoke 122, the driving magnets 132A and 132B are fixed to the inner surfaces of the two side walls 122e along the Y direction. The driving magnets 132A and 132B are fixed to the side walls 122e by, for example, adhesion. The driving magnets 132A and 132B are magnetized in mutually opposite directions in the inward and outward directions.
The light receiving sides of the drive magnets 132A and 132B in the optical axis direction are covered by a eaves portion 122c of the top plate along the Y direction. The eaves portion 122c is provided with an insertion piece 122d that hangs down in the Z direction. The insertion piece 122d is inserted between a notch 11k provided in the lens holder 11 and the AF coil 131. The insertion piece 122d faces the drive magnets 132A and 132B across the AF coil 131. In the magnetic circuit formed by the yoke 122 and the drive magnets 132A and 132B, magnetic flux efficiently crosses the AF coil 131, improving drive efficiency.

In the yoke 122, one side wall 122e along the X direction (the side wall 122e on the near side in FIG. 4) is provided with a notch 122f having a shape corresponding to one standing wall 121f of the base 121. Moreover, the standing wall 121f of the base 121 is fixed to the inner surface of the other side wall 122e along the X direction (the side wall 122e on the far side in FIG. 4) by, for example, adhesion.
Further, a base engaging portion 122g that engages with the yoke attachment pieces 121d and 121e of the base 121 is provided at the lower end portion of the yoke 122 on the image forming side in the optical axis direction.

The upper spring 141 is a leaf spring made of a metal material such as beryllium copper, nickel copper, or stainless steel. The upper spring 141 elastically supports the lens holder 11 relative to the AF fixed portion 12 (yoke 122).

The upper spring 141 is formed, for example, by punching out a single sheet of metal. The upper spring 141 has a lens holder fixing part 141a, a yoke fixing part 141b, and an arm part 141c. The lens holder fixing part 141a has a shape corresponding to the upper spring fixing part 11b of the lens holder 11, and a part corresponding to the positioning piece 11c is cut out. The yoke fixing part 141b is provided at the four corners of the upper spring 141, and has a shape corresponding to the upper spring fixing part 122b of the yoke 122. The arm part 141c has a zigzag shape, and connects the lens holder fixing part 141a and the yoke fixing part 141b.

The upper spring 141 is positioned and fixed to the lens holder 11 by engaging a notch (reference number omitted) of the lens holder fixing portion 141a with a positioning piece 11c of the lens holder 11. The upper spring 141 is also fixed to the yoke 122 by bonding the yoke fixing portion 141b to the upper spring fixing portion 122b of the yoke 122. When the lens holder 11 moves in the optical axis direction, the lens holder fixing portion 141a is displaced together with the lens holder 11, and the arm portion 141c is elastically deformed.

The lower springs 142A and 142B are two leaf springs made of a metal material such as beryllium copper, nickel copper, or stainless steel. The lower springs 142A and 142B elastically support the lens holder 11 relative to the AF fixing portion 12 (base 121).

The lower springs 142A and 142B are formed, for example, by punching out a single sheet of metal. The lower springs 142A and 142B each have a lens holder fixing portion 142a, a base fixing portion 142b, and an arm portion 142c. The lens holder fixing portion 142a has a shape corresponding to the lower spring fixing portion 11d of the lens holder 11. The base fixing portion 142b is provided at the four corners of the lower springs 142A and 142B, and has a shape corresponding to the lower spring fixing portion 121b of the base 121. The arm portion 142c has a zigzag shape and connects the lens holder fixing portion 142a and the base fixing portion 142b.

The lower springs 142A and 142B each have a winding connection portion 142d at the lens holder fixing portion 142a. The winding connection portion 142d is electrically connected to the AF coil 131 wound around the winding portion 11j of the lens holder 11. The base fixing portion 142b is electrically connected to the terminal fittings 124 and 125 arranged on the base 12. Power is supplied to the AF coil 131 via the lower springs 142A and 142B.

The lower springs 142A and 142B are positioned and fixed to the lens holder 11 by inserting a fixing hole (number omitted) of the lens holder fixing part 142a into a positioning piece 11c of the lens holder 11. The lower springs 142A and 142B are also positioned and fixed to the base 12 by inserting a positioning boss 121c of the base 12 into a fixing hole (number omitted) of the base fixing part 142b. When the lens holder 11 moves in the optical axis direction, the lens holder fixing part 142a displaces together with the lens holder 11, and the arm part 142c displaces elastically.

The FPC 15 is a flexible substrate in which a conductor pattern (electrical circuit) made of a conductive metal material such as copper foil is formed on a film-like substrate made of an insulating resin material (e.g., polyimide). A control IC 151 is mounted on the FPC 15. The conductor pattern includes power terminals 152a, 152b, signal terminals 152c, 152d, coil power supply terminals 152e, 152f, and wiring (not shown). The wiring is formed, for example, on the front and back surfaces of the FPC. The wiring formed on the front surface of the substrate and the wiring formed on the back surface of the substrate are connected via through holes. The front and back surfaces of the FPC 15 are covered with a coverlay, and each of the terminals 152a to 152f is exposed from the coverlay.

The power supply terminals 152a, 152b and the signal terminals 152c, 152d are mechanically and electrically connected to the OIS fixing portion 22 of the OIS lens driving device 2, for example.
The coil power supply terminals 152e, 152f are mechanically and electrically connected to the ends 124b, 125b of the terminal fittings 124, 125, respectively.
Each of the terminals 152a to 152f is electrically connected to the control IC 151 via a wiring.

The control IC 151 functions as a coil control unit that controls the current flowing through the AF coil 131. Specifically, the control IC 151 controls the current flowing through the AF coil 131 based on control signals input from signal terminals 152c and 152d and a detection result (hall output) by a hall element (not shown) built into the control IC 151.
In the AF lens driving device 1, power is supplied from the control IC 151 to the AF coil 131 via the terminal fittings 124 and 125 and the lower springs 142A and 142B.

The control IC 151 incorporates a Hall element (not shown) that utilizes the Hall effect to detect changes in a magnetic field, and functions as a position detection unit that detects the position of the lens holder 11 in the optical axis direction. When the lens holder 11 moves in the optical axis direction, the magnetic field generated by the position detection magnet 16A changes. The Hall element detects this change in magnetic field, and the position of the lens holder 11 in the optical axis direction is detected. By designing the layout of the Hall element and the position detection magnet 16A so that the detection surface of the Hall element is intersected by a magnetic flux proportional to the amount of movement of the lens holder 11, a Hall output proportional to the amount of movement of the lens holder 11 can be obtained.

The FPC 15 is fixed, for example, by adhesion, to the upright wall 121f of the base 121. At this time, the control IC 151 is inserted into the IC housing portion 121h of the base 121.
As shown in Figures 6A and 6B, the FPC 15 has a portion FS (hereinafter referred to as the "fixed substrate portion FS") that is fixed to the base 121, and a portion MS (hereinafter referred to as the "movable substrate portion MS") that is deformable in response to the movement of the lens holder 11.

The fixed substrate part FS is divided into an IC mounting part FS1 on which the control IC 151 is mounted, and a branch part FS2 which extends from the IC mounting part FS1 and is narrower than the IC mounting part FS1. A movable substrate part MS is connected to the IC mounting part FS1 and is substantially parallel to the branch part FS2.
The movable substrate part MS is bent at a substantially right angle. The movable substrate part MS has a first extension part MS1 connected to the fixed substrate part FS (IC mounting part FS1) and a second extension part MS2 connected to the first extension part MS1. An end of the second extension part MS2 extends to the imaging side in the optical axis direction (the OIS lens driving device 2 side).

7A and 7B show the attached state of the FPC 15. Fig. 7A is a plan view of the AF lens driving device 1, and Fig. 7B is a plan view of the AF lens driving device 1 with the yoke 122 removed.
7A and 7B, the first extension portion MS1 is inclined with respect to the X direction, and the second extension portion MS2 is parallel to the Y direction. That is, the first extension portion MS1 is inclined with respect to a first side (side along the X direction) that defines the outer shape of the AF lens driving device 1, and the second extension portion MS2 is parallel to a second side (side along the Y direction) adjacent to the first side.
Specifically, the angle between the extension direction (first direction) of the first extension portion MS1 and the extension direction (second direction) of the second extension portion MS2 is equal to or greater than 60° and less than 90° (for example, 87°).
As a result, the portion from the first extending portion MS1 to the bent portion MS3 is separated from the yoke 122, forming a space, so that the FPC 15 can easily deform in response to the shake correction operation.

Since the control IC 151 is mounted on the fixed substrate part FS, a conductor pattern is formed on both sides of the substrate. In contrast, the conductor pattern is formed on only one side of the substrate of the movable substrate part MS. That is, in this embodiment, the movable substrate part MS has fewer wiring layers and is thinner than the fixed substrate part FS. This improves the flexibility of the movable substrate part MS, so that restrictions on movement by the FPC 15 during shake correction can be alleviated, and shake correction can be performed normally without hindrance.

In addition, the bent portion MS3 between the first extension portion MS1 and the second extension portion MS2 is processed into an R-shape. This allows the FPC 15 to more flexibly respond to shake correction operations.

In addition, an R-shaped cutout FS3 is provided at the connection between the IC mounting portion FS1 and the first extension portion MS1. The connection between the IC mounting portion FS1 and the first extension portion MS1 is subjected to stress during shake correction, but the R-shaped cutout FS3 allows the stress to be dispersed.

When automatic focusing is performed in the AF lens driving device 1, electricity is applied to the AF coil 131. When electricity is applied to the AF coil 131, a Lorentz force is generated in the AF coil 131 due to the interaction between the magnetic field of the driving magnets 132A and 132B and the current flowing through the AF coil 131. The direction of the Lorentz force is a direction (Z direction) perpendicular to the direction of the magnetic field caused by the driving magnets 132A and 132B and the direction of the current flowing through the AF coil 131. Since the driving magnets 132A and 132B are fixed, a reaction force acts on the AF coil 131. This reaction force becomes the driving force for the AF voice coil motor, and the lens holder 11 to which the AF coil 131 is attached moves in the optical axis direction, performing focusing.

When no current is being applied and focusing is not being performed, the AF movable part 11 is held in a state (hereinafter referred to as the "reference state") suspended between the infinity position and the macro position by, for example, the upper spring 141 and the lower springs 142A and 142B. That is, the AF movable part 11 is elastically supported by the upper spring 141 and the lower springs 142A and 142B so as to be displaceable in both directions of the optical axis while being positioned relative to the AF fixed part 12. When focusing is performed, the direction of the current is controlled depending on whether the AF movable part 11 is moved from the reference state to the macro position side or to the infinity position side. Also, the magnitude of the current is controlled depending on the movement distance (stroke) of the AF movable part 11 from the reference state.

The current passing through the AF coil 131 is controlled by the control IC 151. Specifically, the control IC 151 controls the current passing through the AF coil 131 based on a control signal supplied via the FPC 15 and a detection result by a Hall element (not shown) built into the control IC 151.
That is, in the AF lens driving device 1, closed-loop control based on the Hall output is completed within the control IC 151. With the closed-loop control method, there is no need to consider the hysteresis characteristics of the voice coil motor, and it is possible to directly detect that the position of the lens holder 11 has stabilized. Furthermore, it is also possible to support automatic focusing using an image plane detection method. Therefore, it has high response performance and can achieve high-speed autofocus operation.

In this way, the AF lens driving device 1 (lens driving device) according to this embodiment is fixed to the OIS movable part 21 (movable part) that moves in a plane perpendicular to the optical axis during shake correction, and moves in the plane perpendicular to the optical axis together with the OIS movable part 21. The AF lens driving device 1 includes an AF fixed part 12, an AF movable part 11 configured to be able to hold the lens part 3 and connected to the AF fixed part 12 so as to be able to move in the optical axis direction, an AF driving part 13 (driving source) that moves the AF movable part 11, and an FPC 15 for supplying power to the AF driving part 13. The FPC 15 has a fixed substrate part FS fixed to the AF fixed part 12, and a movable substrate part MS that is deformable in accordance with the movement of the AF movable part 11. The movable substrate part MS has a first extension part MS1 connected to the fixed substrate part FS and extending in a first direction perpendicular to the optical axis direction, a second extension part MS2 connected to the first extension part MS1 and extending in a second direction perpendicular to the optical axis direction, and a bent part MS3 between the first extension part MS1 and the second extension part MS2, and is formed thinner than the fixed substrate part FS.

The AF lens driving device 1 can ease the restrictions on movement caused by the FPC 15 during shake correction, allowing shake correction to be performed normally without any problems.

The invention made by the inventor has been specifically described above based on the embodiment, but the invention is not limited to the above embodiment and can be modified without departing from the gist of the invention.

For example, in the embodiment, a smartphone M, which is a mobile terminal with a camera, has been described as an example of a camera-mounted device equipped with a camera module A, but the present invention can be applied to a camera-mounted device having a camera module and an image processing unit that processes image information obtained by the camera module. Camera-mounted devices include information devices and transportation equipment. Information devices include, for example, mobile phones with cameras, notebook computers, tablet terminals, portable game consoles, web cameras, and in-vehicle devices with cameras (for example, rear monitor devices and drive recorder devices). Furthermore, transportation equipment includes, for example, automobiles.

Figures 8A and 8B are diagrams showing an automobile V as a camera-mounted device equipped with an in-vehicle camera module VC (Vehicle Camera). Figure 8A is a front view of the automobile V, and Figure 8B 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 Figures 8A and 8B, the in-vehicle camera module VC is attached, for example, to the windshield facing forward or to the rear gate facing backward. This in-vehicle camera module VC is used for rear monitors, drive recorders, collision avoidance control, automatic driving control, etc.

Furthermore, for example, in the AF lens driving device 1, the configuration other than the FPC 15 arranged on the base 121 can be changed as appropriate.
Furthermore, the configuration of the AF driving unit 13 is not limited to that shown in the embodiment. For example, in the AF driving unit 13, the shape and arrangement of the AF coil unit 131 and the driving magnet 132 are arbitrary. Also, for example, the AF driving unit 13 may be a moving magnet type in which the AF coil 131 is arranged in the AF fixed unit 12 and the driving magnet 132 is arranged in the AF movable unit. Furthermore, an ultrasonic motor may be applied to the AF driving unit 13.
That is, the present invention can be applied to the case where, in the AF lens driving device 1 used together with the OIS lens driving device 2, power is supplied to the AF driving section 13 via an FPC.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

1. AF lens drive device (lens drive device)
2 OIS lens driving device 3 Lens section 11 AF movable section, lens holder 12 AF fixed section 121 Base 122 Yoke 124, 125 Terminal fittings 126, 127 Reinforcement plate 13 AF driving section 131 AF coil 132A, 132B Driving magnet 14 AF support section 141 Upper spring 142A, 142B Lower spring 15 Flexible printed circuit board 151 Control IC
152a to 152f Terminals 16A, 16B Position detection magnet A Camera module M Smartphone (camera-mounted device)
FS Fixed board part MS Movable board part

Claims (5)

a fixing portion having a rectangular shape in a plan view from the optical axis direction and having an upright wall formed to protrude in the optical axis direction;
a movable portion configured to be able to hold a lens portion and connected to the fixed portion so as to be able to move in the optical axis direction;
A drive source that moves the movable part;
a flexible printed circuit board for supplying power to the driving source;
The flexible printed circuit board is
A first substrate portion having a substrate surface fixed to a wall surface of the upright wall;
a second substrate portion connected to the first substrate portion and at least a portion of which is spaced apart from the standing wall in a direction perpendicular to the optical axis direction,
An electronic component is disposed on the first substrate portion ,
the second substrate portion has a bent portion that extends along the rectangular shape and is bent,
The bent portion is spaced apart from the upright wall.
Lens drive unit. The upright wall has a board fixing portion to which the first board portion is fixed and an accommodation portion to accommodate the electronic component.
The lens driving device according to claim 1 . The second substrate portion is formed thinner than the first substrate portion.
3. The lens driving device according to claim 1. The lens driving device according to claim 1 ,
A lens unit attached to the movable part;
an imaging unit that captures a subject image formed by the lens unit,
Camera module. A camera-equipped device that is an information device or a transport device,
A camera module according to claim 4 ;
and an image processing unit that processes image information obtained by the camera module.
Camera-equipped device.