JP2013041026A - Camera shake suppression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera shake suppression device which is capable of efficiently swinging a lens driving device with a simple configuration.SOLUTION: A camera shake suppression device 10 for suppressing a shake of a lens driving device 20 includes: a base 11; a movable base 13 holding the lens driving device 20; a swinging flat spring 12 which suspends the movable base 13 on the base 11 so as to allow the movable base to swing; and electromagnetic driving means 141 to 144 which are arranged at uniform angular intervals around a Z axis being an axial line of the movable base 13 and comprise a plurality of pairs of coils and magnetic pieces comprising excitation coils 151 to 154 and magnetic pieces 161 to 164 and swing the movable base 13 relative to the base 11. The camera shake suppression device 10 is configured so that the excitation coils 151 to 154 are mounted on the base 11 and the magnetic pieces 161 to 164 are mounted on the movable base 13.

Description

  The present invention relates to a camera shake suppression device capable of suppressing camera shake of, for example, a photographing optical apparatus.

In recent years, a camera mounted on a mobile phone or the like has increased in the number of pixels of an image sensor, and the quality of captured images has been improved. Along with this, the lens system to be mounted is also shifting from the conventional fixed focus lens driving device to the movable focus lens driving device. This is because a fixed-focus lens driving device is out of focus and cannot cope with the resolution of a high pixel count image sensor.
As a lens system driving method in a movable focus lens driving device, a lens driving device using a voice coil motor is often used (see, for example, Patent Document 1).
However, since a camera mounted on a mobile phone or the like is likely to be shaken during shooting, a shooting optical device having a function of suppressing camera shake by swinging a lens holder has been proposed. Accordingly, in addition to the function of driving the lens holder in the optical axis direction of the lens, camera shake can be suppressed, so that a clear image can be formed on the image sensor (see, for example, Patent Document 2).

JP 2004-280031 A JP 2009-294393 A

  However, the conventional camera shake suppression device has a problem in that the drive efficiency is low because the lens driving device is swung by the Lorentz force generated on a part of the side of the driving coil.

  The present invention has been made in view of the conventional problems, and an object thereof is to provide a camera shake suppression device capable of efficiently swinging a lens driving device with a simple configuration.

As a result of intensive studies, the inventor has arranged a plurality of pairs of coils and magnetic pieces arranged so as to face the openings of the coils around the axis in the moving direction of the movable base, and thereby using Coulomb force (magnetic force). If a structure that suppresses camera shake by providing an electromagnetic drive means for driving the movable base can exert a strong attractive force on the magnetic piece, a compact and easy-to-use camera shake suppressor with excellent drive efficiency is provided. The present invention has been found out that it can be obtained.
That is, the invention according to claim 1 of the present application includes a base as a fixed member, a cylindrical movable base that holds a lens driving device, and a spring member that swingably suspends the movable base from the base. And an electromagnetic drive unit that swings the movable table with respect to the base, wherein when the axial direction of the movable table is the Z-axis direction, the electromagnetic drive unit includes: A plurality of coil-magnetic piece pairs, which are arranged at equal angles around the Z-axis and are composed of an excitation coil and a magnetic piece arranged to face the opening of the excitation coil, are provided, and the excitation coil and the magnetic One of the pieces is mounted on the movable table, and the other is mounted on the base.
In this way, multiple pairs of coil-magnetic piece pairs are arranged at equal angles around the Z axis, energized through the exciting coil, and the magnetic piece is attracted by the Coulomb force to drive the movable base. With a simple configuration, the swinging in the X-axis direction including the linear reciprocating motion in the X-axis direction and the pendulum motion involving rotation around the X-axis, the Y including the pendulum motion involving the linear reciprocating motion in the Y-axis direction and rotation around the Y-axis. Since the swinging in the axial direction and the swinging in combination with these can be given to the movable base, hand shake can be reliably suppressed.

A second aspect of the present invention is the camera shake suppression device according to the first aspect, wherein the exciting coil includes an X-axis direction and a Y-axis that are two directions perpendicular to the Z-axis acting on the movable base. The excitation current is distributed according to the polarity of the velocity signal (hereinafter referred to as velocity signal) of either or both of the directions.
Thus, since the velocity signals in the X-axis direction and the Y-axis direction are separately detected and the excitation coil is energized, the X-axis direction swing and the Y-axis direction swing are combined. Camera shake can be easily suppressed.
A third aspect of the present invention is the camera shake suppression device according to the second aspect, wherein the speed signal is a signal corresponding to a rotational angular speed of the movable table.
As described above, since the rotational angular velocity of the movable base that swings due to the camera shake is directly measured and used as the speed signal, the suppression of the camera shake can be reliably suppressed.
According to a fourth aspect of the present invention, in the camera shake suppression device according to the second aspect, the velocity signal is imaged on an image sensor provided in a plane parallel to the XY plane behind the movable base in the Z axis. It is a signal according to the moving speed of the image to be performed.
In addition, since the moving speed of the image formed on the image sensor is used as a speed signal and the position of the image that moves due to camera shake is returned, the suppression of camera shake can be reliably suppressed.
A fifth aspect of the present invention is the camera shake suppression device according to any one of the second to fourth aspects, wherein the excitation current is pulsed.
If the magnetic piece is accelerated by the pulse-like signal, the movable base moves by the inertial force even after the exciting current is stopped. Therefore, since energization is intermittent and requires a short time, it is effective for power saving.

  The summary of the invention does not list all necessary features of the present invention, and a sub-combination of these feature groups can also be an invention.

It is a figure which shows the structure of the camera-shake suppression apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of an electromagnetic drive means. It is a figure which shows the shape of the leaf | plate spring for rocking | fluctuation. It is a figure which shows an example of a camera module of an image sensor fixed type. It is a figure which shows an example of a camera module of an image sensor movable type. It is a figure for demonstrating operation | movement of a camera module of an image sensor fixed type when camera shake acts. It is a figure for demonstrating the camera-shake suppression method of an image sensor fixed type camera module. It is a figure for demonstrating operation | movement of an image sensor movable type camera module when camera shake acts. It is a figure for demonstrating the camera-shake suppression method of an image sensor movable type camera module. It is a figure which shows an example of the exciting current made to make an analog response to a speed signal. It is a figure which shows the other structure of the camera-shake suppression apparatus by this invention. It is a figure which shows the other structure of the camera-shake suppression apparatus by this invention. It is a figure which shows the other structure of the camera-shake suppression apparatus by this invention. It is a figure which shows the structural example of an electromagnetic drive means in case the lens drive device is provided with the magnetic shield or the magnetic yoke. It is a figure which shows the structure of the camera-shake suppression apparatus which concerns on this Embodiment 2. FIG. It is a figure which shows the other structure of the camera-shake suppression apparatus by this invention. It is a figure which shows the structure of the front spring member and back spring member which clamp a camera module, and operation | movement of a camera module.

  Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

Embodiment 1 FIG.
FIGS. 1A and 1B are diagrams showing a configuration of a camera shake suppression device 10 according to Embodiment 1 of the present invention, where FIG. 1A is a plan view, and FIG. 1B is a diagram A of FIG. It is -A sectional drawing.
The camera shake suppression device 10 includes a frame-shaped base 11 as a fixed member, a frame-shaped movable base 13 that is suspended on the base 11 by a swinging plate spring 12 that is a spring member, and a movable base 13. Are provided with first to fourth electromagnetic drive means 141 to 144 for swinging the base 11, and a lens driving device 20 is mounted on the inner peripheral side of the movable base 13.
The lens driving device 20 includes, for example, a lens holder that holds a lens, a case that is a fixing member, a driving coil, a permanent magnet, and a spring member that connects the lens holder and the case. The thing of the form of is used.
Hereinafter, the subject direction of the lens driving device 20 is defined as the front in the Z-axis direction (+ Z side), and the two directions orthogonal to the Z-axis are defined as the X-axis and the Y-axis, respectively.
In this example, when the lens driving device 20 is viewed from the Z-axis direction, the outer shape is two sides extending in the Y-axis direction (+ X side side and −X side side) and two sides extending in the X-axis direction ( A case of a square composed of a + Y side and a −Y side) will be described.

The first electromagnetic driving means 141 includes a first exciting coil 151 wound around the X axis and disposed on the inner peripheral side of the + X side of the base 11, and the + X side of the movable base 13. A coil-magnetic piece pair including a first magnetic piece 161 arranged on the outer peripheral side and arranged to face the opening of the exciting coil 151 is provided.
The second electromagnetic driving means 142 includes a second exciting coil 152 wound around the X axis and disposed on the inner peripheral side of the −X side side of the base 11, and the −X side of the movable base 13. A coil-magnetic piece pair including a second magnetic piece 162 arranged on the outer peripheral side of the side and arranged to face the opening of the exciting coil 152 is provided.
The third electromagnetic drive means 143 includes a third excitation coil 153 wound around the Y axis and disposed on the inner peripheral side of the side on the + Y side of the base 11, and the + Y side of the movable base 13. A coil-magnetic piece pair including a third magnetic piece 163 arranged on the outer peripheral side of the side and arranged to face the opening of the exciting coil 153 is provided.
The fourth electromagnetic driving means 144 is wound around the Y axis and arranged on the inner peripheral side of the −Y side of the base 11, and the −Y side of the movable base 13. A coil-magnetic piece pair including a fourth magnetic piece 164 arranged on the outer peripheral side of the side and arranged to face the opening of the exciting coil 154 is provided.
In this example, magnetic pieces made of a soft magnetic material are used as the first to fourth magnetic pieces 161 to 164. As a result, the first to fourth magnetic pieces 161 to 164 are moved in the axial direction of the first to fourth excitation coils 151 to 154 regardless of the polarity of the current applied to the first to fourth excitation coils 151 to 154. It can be magnetized and attracted in a parallel direction.
The first to fourth magnetic pieces 161 to 164 only need to face the openings of the first to fourth excitation coils 151 to 154, and the tips thereof are the first to fourth excitation coils 151 to 154. It does not matter whether it has entered the inner peripheral side or not.

Since the first to fourth excitation coils 151 to 154 are wound around the X axis or the Y axis, for example, as shown in FIGS. 2A and 2B, the first excitation coil 151 is used. When a current is applied to the first exciting coil 151, a magnetic field is generated on the central axis of the first exciting coil 151 and has a distribution such that the intensity is maximized at the axial center of the coil. Since the energized first exciting coil 151 corresponds to a magnet magnetized in the axial direction of the coil, a Coulomb force (magnetic force) acts on the first magnetic piece 161, and the first magnetic piece 161 One excitation coil 151 is drawn toward the center. The relationship between the second to fourth exciting coils 152 to 154 and the second to fourth magnetic pieces 162 to 164 is the same.
In addition, since the force for attracting the first to fourth magnetic pieces 161 to 164 can be increased / decreased by changing the magnitude of the excitation current energized to the first to fourth excitation coils 151 to 154, The moving speed applied to the fourth magnetic pieces 161 to 164 can be controlled.
In addition, when the excitation current is pulsed, the first to fourth magnetic pieces 161 to 164 can be moved by inertia after giving acceleration only for a predetermined time corresponding to the pulse width.

As shown in FIG. 3, the swinging leaf spring 12 includes an outer ring 12a, an inner ring 12b, an intermediate ring 12c, an X-side connector 12m, and a Y-side connector 12n. The outer ring 12 a, the inner ring 12 b, and the intermediate ring 12 c are similar square plate frames, the outer ring 12 a is attached to the inner edge of the base 11, and the inner ring 12 b is attached to the outer edge of the movable base 13, The outer ring 12a and the intermediate ring 12c are connected by the Y side connector 12n on the + Y side and the −Y side, and the inner ring 12b and the intermediate ring 12c are connected by the X side connector 12m on the + X side and the −X side. Yes.
The intermediate ring 12c and the X-side and Y-side connectors 12m and 12n are movable parts of the swinging leaf spring 12 that substantially functions as a spring member.
In this example, in order to suppress unintentional movement in the Z-axis direction, the intermediate ring 12c is made thicker than the outer ring 12a and the inner ring 12b to make it difficult to bend.
By adopting such a configuration, when a torque around the X axis acts on the movable table 13, the X side connector 12m is twisted around the X axis, and the movable table 13 rotates until it balances with the spring reaction force of the X side connector 12m. To do. On the other hand, when a torque around the Y-axis acts on the movable table 13, the Y-side connector 12n is twisted around the Y-axis, and the movable table 13 rotates until it balances with the spring reaction force of the Y-side connector 12n.

By applying the camera shake suppression device 10 of the present invention to a camera module, a camera module 30A with a camera shake suppression function as shown in FIG. 4 can be configured. Specifically, the lens module 21 is mounted on the lens driving device 20, and the image sensor 31 that detects the subject image focused by the lens 21 is mounted on the camera shake suppression device 10, thereby providing a camera module with a camera shake suppression function. 30A is configured. The image sensor 31 is mounted on a sensor holder 32, and the sensor holder 32 is attached to the base 11. The image sensor 31 is mounted on the side opposite to the subject side of the lens driving device 20 and on the lens driving device 20 side of the sensor holder 32.
An angular velocity sensor (not shown) is attached to the movable base 13 which is a movable portion of the camera shake suppression device 10, and the first to fourth excitation coils 151 to 154 are energized according to the detection output of the angular velocity sensor. The magnitude and direction of the excitation current are controlled. The angular velocity sensor may be attached to the lens driving device 20 of the camera module 30A.
Further, as shown in FIG. 5, a camera holder 30 with a camera shake suppression function may be configured by attaching a sensor holder 32 equipped with an image sensor 31 to the movable base 13.
In the camera module 30A with a camera shake suppression function, the image sensor 31 is attached to the base 11 that is a fixed member. Therefore, the optical axis of the lens 21 is rotated by camera shake, and the imaging point is shifted from the center of the image sensor 31. In this case, the lens driving device 20 is swung by the camera shake suppression device 10 so that the image formation point on the image sensor 31 is returned.
On the other hand, in the camera module 30B with a camera shake suppression function, the sensor holder 32 is attached to the movable base 13 which is a movable member, so that the lens driving device 20 and the sensor holder 32 (image sensor 31) are swung in conjunction with each other. The imaging point on the image sensor 31 is returned.

Next, the operation of the camera module 30A with a camera shake suppression function will be described.
Here, an example is shown in which when a camera shake that rotates at a rotational angular velocity Ω around the Y axis occurs, a pulsed excitation current is applied to the first and second excitation coils 151 and 152 to suppress the camera shake.
As shown in FIG. 6A, when a camera shake occurs such that the camera module 30A rotates to the right around the Y axis, the optical axis of the lens 21 also rotates, so that the imaging point P deviates from the center of the image sensor 31. End up.
In many cases, the hand shake is not actually a rotation in one direction but is finally rotated clockwise or counterclockwise while shaking left and right. Therefore, the position of the imaging point P on the image sensor 31 is, for example, A time change as shown in FIG. On the other hand, the rotational angular velocity of the movable table 13 changes with time as shown in FIG. This rotational angular velocity signal is a shaking velocity signal acting on the movable table 13. Hereinafter, this rotational angular velocity signal is referred to as a velocity signal.
When the speed signal is (+), the lens driving device 20 is going to rotate clockwise around the Y axis, and as shown in FIG. 7A, the excitation current I is applied to the second excitation coil 152 of the camera shake suppression device 10. ₂ is energized to rotate the lens driving device 20 counterclockwise. On the other hand, when the speed signal is (−), the lens driving device 20 is going to rotate counterclockwise around the Y axis, so that the exciting current I ₁ is applied to the first exciting coil 151 as shown in FIG. 7B. The lens driving device 20 is rotated clockwise.
As a result, as shown in FIG. 7C, the lens driving device 20 can be rotated in the direction opposite to the direction of camera shake to return the image formation point P on the image sensor 31 to the original position.
By repeating the operation of returning the position of the imaging point P to the original position, the change in the position of the imaging point P on the image sensor 31 can be reduced as shown in FIG. Can be reliably suppressed.
It is assumed that a current having a magnitude corresponding to the magnitude of the speed signal flows through the first and second exciting coils 151 and 152.

Further, in this example, as shown in FIGS. 7A and 7B, the excitation current applied to the first and second excitation coils 151 and 152 is a pulsed current. The pulse width of the excitation current may be set in the range of 1 ms to 1000 ms, for example, regardless of the amplitude or frequency of the speed signal. In addition, the magnitude of the excitation current distributed to the first and second electromagnetic driving means 141 and 142 (the current flowing through the first and second excitation coils 151 and 152) is increased or decreased depending on the magnitude of the speed signal. .
As a result, acceleration in the + X direction or −X direction is applied to the first and second magnetic pieces 161 and 162, and after the excitation current is stopped, the speed reaches a position where the inertial force and the restoring force by the spring member 12 are balanced. Move while reducing.
In addition, the pulsed excitation current is effective for power saving because it only needs to be energized intermittently for a short time during the imaging mode.
As described above, if the exciting currents to be supplied to the first and second exciting coils 151 and 152 are distributed according to the polarity of the speed signal acting on the movable table 13 due to the hand shake, Since a shake in the direction opposite to the camera shake is applied, as shown in FIG. 7D, the imaging point P on the image sensor 31 shifted by the camera shake can be returned to the original position.
In addition, with respect to camera shake around the X axis, it is only necessary to suppress the camera shake by applying a pulsed excitation current to the third and fourth excitation coils 153 and 154.
Further, for camera shake around an axis that is inclined with respect to the X axis or the Y axis in the XY plane, the camera shake around the X axis (rotational angular velocity) and the camera shake around the Y axis (rotation) Angular velocity), and by applying pulsed excitation currents to the first and second exciting coils 151 and 152 and the third and fourth exciting coils 153 and 154 for each hand shake, the hand shake is suppressed. Can do.

Further, the camera shake with the camera shake suppression function 30B having the configuration in which the image sensor 31 is attached to the movable base 13 shown in FIG.
For example, as shown in FIG. 8A, when a camera shake occurs such that the camera module 30B rotates clockwise around the Y axis, the optical axis of the lens 21 and the image sensor 31 rotate at the same time. Is deviated from the center of the image sensor 31. At this time, the position of the image formation point P on the image sensor 31 and the time change of the speed signal of the movable base 13 are the same as those in the camera module 30A with a camera shake suppression function, as shown in FIGS. It becomes like this. Therefore, when an excitation current as shown in FIGS. 9A and 9B is passed through the first and second excitation coils 151 and 152, as shown in FIG. Since the sensor 31 can be rotated in the direction opposite to the direction of camera shake, as shown in FIG. 9D, the image formation point on the image sensor 31 shifted by the camera shake can be returned to the original position. .

In the first embodiment, an angular velocity sensor is attached to the movable table 13, and the rotational angular velocity that is the output of this angular velocity sensor is used as a velocity signal that acts on the movable table 13, but the image formed on the image sensor 31 is moved. A moving speed detecting means for detecting the speed may be provided, and an output signal of the moving speed detecting means may be a speed signal acting on the movable table 13. As a result, the angular velocity sensor can be omitted, and the moving speed of the image formation point of the image sensor 31 can be directly detected, so that camera shake can be more effectively suppressed.
In the above example, magnetic pieces made of a soft magnetic material are used as the first to fourth magnetic pieces 161 to 164. However, the first to fourth exciting coils 151 to 154 are arranged to be N poles or S poles. Alternatively, a pole piece made of a permanent magnet magnetized in a magnetic field may be used. In this case, it goes without saying that the direction of the current supplied to the first to fourth exciting coils 151 to 154 is set to the direction in which the first to fourth magnetic pieces 161 to 164 are drawn.

In the above example, the excitation current is pulsed. However, the present invention is not limited to this, and it may be a current generated stepwise corresponding to the speed signal or an analog response signal.
A signal obtained by analog response to the speed signal will be described by taking as an example a case in which camera shake that rotates around the Y axis at a rotational angular speed Ω occurs.
First, as shown in FIG. 10 (a), a speed signal of the movable platform 13 with the camera shake rectifies each half-wave, (+) side of the current I ₊ and separated into a _- (-) side of the current I . Then, as shown in FIG. 10B, the current I ₊ on the (+) side is applied to the second excitation coil 152 as the excitation current I ₂ , and the current obtained by inverting the current I ₋ on the (−) side is excited. The current I ₁ is applied to the first exciting coil 151. In this manner, by passing the signals I ₁ and I ₂ that are analog-responsive to the speed signal to the first and second exciting coils 151 and 152, respectively, as shown in FIG. 10C, camera shake is suppressed. be able to. When the magnetic piece is a soft magnetic material as in this example, the current I ₋ on the (−) side may be applied as it is to the first exciting coil 151 without being inverted.
Further, with respect to camera shake around the X axis, a signal obtained by analog response to the speed signal may be applied to the third and fourth exciting coils 153 and 154.

In the above example, air-core coils are used as the first to fourth exciting coils 151 to 154. However, as shown in FIG. 11, auxiliary magnetic cores are provided on the inner circumferences of the first to fourth exciting coils 151 to 154, respectively. If it is set as the structure which inserts and fixes 171-174, since the force which attracts | sucks the 1st-4th magnetic pieces 161-164 will increase, camera shake can be efficiently suppressed with little electric current.
Moreover, in the said example, although the 1st-4th exciting coils 151-154 were arrange | positioned at the base 11, and the 1st-4th magnetic pieces 161-164 were arrange | positioned at the movable stand 13, as shown in FIG. In addition, the same effect can be obtained even if the first to fourth magnetic pieces 161 to 164 are arranged on the base 11 and the first to fourth exciting coils 151 to 154 are arranged on the movable base 13. In this case as well, it goes without saying that the first to fourth magnetic pieces 161 to 164 are arranged so as to face the openings of the first exciting coils 151 to 154.
In the above example, the first to fourth exciting coils 151 to 154 and the first to fourth magnetic pieces 161 to 164 of the electromagnetic driving means 141 are arranged at the centers of the sides of the base 11 and the movable base 13, respectively. However, the present invention is not limited to this. For example, as shown in FIG. 13, first to fourth exciting coils 151 to 154 are arranged at four corners on the inner peripheral side of the base 11, and It is good also as a structure which arrange | positions the 1st-4th magnetic pieces 161-164 in the side corner | angular part of the movable stand 13. FIG.
In the above example, four pairs of coil-magnetic pieces are provided at intervals of 90 ° around the Z-axis. However, two pairs of coil-magnetic pieces are arranged at intervals of 180 °, and the X-axis direction is set. Alternatively, camera shake suppression may be performed in which only swinging in any direction in the Y-axis direction is controlled.

Further, in the above example, the hand movement is suppressed by using the electromagnetic driving means 141 to 144 formed of a coil-magnetic piece pair. For example, as shown in FIG. 14A, the lens driving device is the lens driving device 20A. When the magnetic shield 20s that covers the outer peripheral side surface is provided, the magnetic shield 20s can be used as a magnetic piece of the electromagnetic drive means.
Even when the lens driving device includes a magnetic yoke, the magnetic yoke can be used as a magnetic piece of the electromagnetic driving means. FIG. 14B is a diagram illustrating an example of a lens driving device 20Y provided with a magnetic yoke 24. The lens driving device 20Y includes a lens holder 22 that holds a lens 21 and a driving coil that is attached to the lens holder 22. 23, a case 25 on which the magnetic yoke 24 is mounted on the inner peripheral side, a drive magnet 26 attached to the inner wall side of the magnetic yoke 24, and upper and lower spring members 27A and 27B that connect the lens holder 22 and the case 25 to each other. And. The drive magnet 26 applies a radially distributed magnetic field to the drive coil 23. For example, a plurality of arc-shaped magnets are annularly formed on the inner wall side of the L-shaped magnetic yoke 24 made of a soft magnetic material. Those arranged in the above are used.
The magnetic yoke 24 includes a horizontal piece 24m that covers the upper side of the drive magnet 26 and a vertical piece 24n that covers the side surface of the drive magnet 26 opposite to the drive coil 23. Therefore, if the exciting coils 151 to 154 are arranged so as to face the vertical piece 24n of the magnetic yoke 24 and energized, an attractive force toward the center of the exciting coils 151 to 154 is applied to the case 25 holding the magnetic yoke 24. be able to. That is, the case 25 of the lens driving device 20Y can function as the movable base 13, and the magnetic yoke 24 can be used as a magnetic piece of electromagnetic driving means.
In addition, the case 25 of the lens driving device 20Y may be attached to a movable base, and the sensor holder 32 on which the image sensor 31 is mounted may be attached to the movable base.

Embodiment 2. FIG.
15 (a) and 15 (b) are diagrams showing the configuration of the camera shake suppression device 40 according to Embodiment 2 of the present invention. FIG. 15 (a) is a cross-sectional view, and FIG. It is a principal part perspective view which shows arrangement | positioning.
The camera shake suppression device 40 includes a frame-shaped base 41 as a fixed member, a frame-shaped movable base 43 that is movably suspended on the base 41 by a swinging plate spring 42 that is a spring member, and a movable base 43. The first to fourth electromagnetic driving means 441 to 444 that swing with respect to the base 41 are provided. The lens driving device 20 is mounted on the inner peripheral side of the movable base 43, and the Z of the movable base 43 is A sensor holder 32 carrying an image sensor 31 is attached to the rear of the shaft.
The lens driving device 20, the image sensor 31, and the sensor holder 32 constitute a camera module 30C.
The base 41 includes a cylindrical side portion 41 a disposed so as to cover the outer peripheral side of the movable base 43 and a bottom portion 41 b provided behind the side portion 41 a and supporting the lower end portion of the side portion.
The configuration of the swinging leaf spring 42 is the same as that of the swinging leaf spring 12 shown in FIG. 3, and the outer ring is attached to the inner edge of the side portion of the base 41 and the inner ring is attached to the outer edge of the movable base 43. .

In the electromagnetic drive units 441 to 444 of the second embodiment, the coil-magnetic piece pair is arranged in the Z-axis direction. That is, the first to fourth electromagnetic driving means 441 to 444 are wound around the Z axis and are on a line connecting sides facing each other on the inner edge side on the surface of the bottom 41b of the base 41 on the sensor holder 32 side. 1st to 4th exciting coils 451 to 454, and 1st to 4th magnetic pieces 461 to 464 arranged so as to face the openings of the 1st to 4th exciting coils 451 to 454, Consists of The first to fourth magnetic pieces 461 to 464 are arranged on the bottom 41 b side of the base 41 in the sensor holder 32.
By adopting such a configuration, for example, when camera shake around the Y axis occurs, the camera module 30C is reversed from camera shake by energizing the first excitation coil 451 or the second excitation coil 452. The camera shake can be suppressed by rotating in the direction. Further, when camera shake around the X axis occurs, the camera module 30C is rotated in the opposite direction to the camera shake by energizing the third excitation coil 453 or the fourth excitation coil 454 to suppress the camera shake. be able to.
Further, the first to fourth magnetic pieces 461 to 464 of the camera shake suppressing device 40 are arranged at the four corners on the bottom 41b side of the base 41, and the first to fourth exciting coils 451 to 454 are arranged on the base of the sensor holder 32. It is good also as a structure arrange | positioned at the four corners by the side of the bottom part 41b of the base 41. FIG.

In the second embodiment, the electromagnetic drive units 441 to 444 are arranged on the Z axis rear side of the camera module 30C. However, as shown in FIG. 16, the first to fourth electromagnetic drive units 441 to 444 are connected to the camera. While arranging the module 30C behind the Z axis, the fifth to eighth electromagnetic driving means 445 to 448 may be arranged in front of the Z axis. Thereby, the camera module 30C is rotated around the X axis, around the Y axis, or around the axis tilted with respect to the X axis or the Y axis in the XY plane, thereby configuring the camera shake suppression device 40D that suppresses camera shake. be able to.
Specifically, the Z-axis direction front end of the side part 41a of the base is extended forward in the Z-axis direction from the opening of the lens driving device 20, and the Z-axis direction front side of the side part 41a of the base is extended. A hollow plate-like coil attachment member 47 is attached to the end, and fifth to eighth excitation coils 455 to 458 wound around the Z axis are disposed on the lens attachment device 20 side of the coil attachment member 47. On the other hand, a hollow plate-like magnetic piece attachment member 48 is attached to the end of the movable base 43 in the Z-axis direction, and the fifth to eighth magnetic pieces 465 to 468 are attached to the coil attachment member 47 side of the magnetic piece attachment member 48. Place. The fifth to eighth magnetic pieces 465 to 468 are arranged so as to face the openings of the fifth to eighth exciting coils 455 to 458.
Further, in this example, the front spring member 49A and the rear spring member 49B are suspended from the camera shake suppression device 40D so as to sandwich the camera module 30C with two leaf springs.
As shown in FIG. 17, the front spring member 49A and the rear spring member 49B each include an outer peripheral frame 49a, an inner peripheral frame 49b, and an intermediate frame 49c formed in a frame shape, and the outer peripheral frame 49a and the intermediate frame 49c. Are connected by a connecting piece 49u protruding in the X-axis direction and a connecting collar portion 49p extending in the Y-axis direction. The inner peripheral frame 49b and the intermediate frame 49c are connected by a connecting piece 49v protruding in the Y-axis direction and a connecting collar portion 49q extending in the Y-axis direction.
The outer peripheral frame 49 a is attached to the inner edge of the side part 41 a of the base, and the inner peripheral frame 49 b is attached to the outer edge of the movable base 43.

For example, when a camera shake that rotates counterclockwise around the Y axis occurs in the camera module 30C, one of the first excitation coil 451 located rearward in the Z axis direction and the sixth excitation coil 456 located forward in the Z axis direction. Energize one or both. When the first exciting coil 451 is energized, the -Z direction Coulomb force acts on the first magnetic piece 461. On the other hand, when the sixth excitation coil 456 is energized, the Coulomb force in the + Z direction acts on the sixth magnetic piece 466. Accordingly, as shown in FIG. 17A, forces directed in the −Z direction are generated on the + X side of the intermediate frame 49c of the front spring member 49A and the + X side of the intermediate frame 49c of the rear spring member 49B, respectively. A force directed in the + Z direction is generated on the −X side of the intermediate frame 49c of the front spring member 49A and the −X side of the intermediate frame 49c of the rear spring member 49B. Therefore, as shown in FIG. 17B, when a camera shake that rotates counterclockwise around the Y axis indicated by the thin arrow in the figure occurs, one of the first excitation coil 451 and the sixth excitation coil 456 is detected. If one or both are energized to cause the camera module 30C to act on the camera module 30C with the force indicated by the white arrow in the figure, and the camera module 30C is rotated to the right around the Y axis, the camera shake that rotates to the left around the Y axis will occur. Can be suppressed.
In addition, when a camera shake that rotates clockwise around the Y axis occurs, either one or both of the second excitation coil 452 located rearward in the Z axis direction and the fifth excitation coil 455 located forward in the Z axis direction are energized. By doing so, it is possible to suppress camera shake by rotating the camera module 30C counterclockwise around the Y axis.
On the other hand, when a camera shake that rotates counterclockwise around the X-axis occurs, energize one or both of the fourth excitation coil 454 that is rearward in the Z-axis direction and the seventh excitation coil 457 that is forward in the Z-axis direction. When a camera shake that rotates clockwise around the X-axis occurs, current is supplied to one or both of the third excitation coil 453 that is rearward in the Z-axis direction and the eighth excitation coil 458 that is forward in the Z-axis direction. By doing so, camera shake around the X axis can be suppressed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

10 camera shake suppression device, 11 base, 12 leaf spring for rocking, 13 movable base,
141-144 1st-4th electromagnetic drive means,
151-154 First to fourth exciting coils,
161-164 1st-4th magnetic piece,
20 lens drive device, 21 lens,
30A, 30B camera module, 31 image sensor,
32 Sensor holder.

Claims (5)

A base as a fixed member, a cylindrical movable base that holds the lens driving device, a spring member that swingably suspends the movable base from the base, and the movable base is swung with respect to the base. A vibration suppressing device including an electromagnetic driving means to be moved,
When the axial direction of the movable table is the Z-axis direction,
The electromagnetic driving means includes a plurality of pairs of coil-magnetic pieces, each of which is formed of an exciting coil and a magnetic piece arranged to face the opening of the exciting coil, arranged at an equal angle around the Z-axis,
One of the exciting coil and the magnetic piece is attached to the movable base, and the other is attached to the base.   An excitation current is distributed to the excitation coil in accordance with the polarity of the velocity signal of one or both of the X-axis direction and the Y-axis direction, which are two directions perpendicular to the Z-axis acting on the movable base. The camera shake suppression device according to claim 1.   The camera shake suppression device according to claim 2, wherein the speed signal is a signal corresponding to a rotational angular speed of the movable base.   3. The signal according to claim 2, wherein the speed signal is a signal corresponding to a moving speed of an image formed on an image sensor provided in a plane parallel to an XY plane behind the movable base in the Z axis. Camera shake suppression device.   The camera shake suppression device according to any one of claims 2 to 4, wherein the excitation current is pulsed.

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