KR101031857B1 - Hand shaking correction device of a camera - Google Patents

Abstract

It is to provide a camera shake correction device with a simple configuration of a drive means (actuator).

The camera module 20 holding the lens and the imaging element is oscillated around the first axis P and the second axis Y perpendicular to the optical axis O and intersecting with each other so as to correct camera shake. The camera shake correction apparatus 30 includes an inner frame 32 which fixes the camera module 20 therein, and an intermediate frame 34 which freely swings the inner frame around the first axis P from the outside thereof. And an outer frame 36 which freely swings the intermediate frame from the outside to the circumference of the second axis Y, and a voice coil motor 40 provided at the bottom of the inner frame and the bottom of the outer frame. The voice coil motor 40 drives the inner frame 32 and the intermediate frame 34 to rock around the 1st axis P and the 2nd axis Y, respectively.

Lens, image pickup device, camera module, optical axis, image stabilization device, inner frame, middle frame, outer frame, voice coil motor

Description

Camera shake correction device {HAND SHAKING CORRECTION DEVICE OF A CAMERA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake correction apparatus, and more particularly, to a camera shake correction apparatus capable of correcting a hand shake (vibration) generated during shooting on a still image so that an image without image shake can be taken.

Even if there is a shake (vibration) at the time of shooting on a still image, various image stabilization apparatuses (image shake correction apparatus) which prevented the image shake on an image formation surface and made it possible to take a clear picture are conventionally proposed.

For example, Japanese Patent Laid-Open No. 2006-65352 (Patent Document 1) describes a specific lens group (hereinafter referred to as "correction lens") in a photographing optical system (imaging optical system) consisting of a plurality of lens groups with respect to an optical axis. Disclosed is an "image shake correction device" for correcting image shake by movement control in two directions perpendicular to each other in a vertical plane. In the image shake correction device disclosed in Patent Literature 1, the correcting lens is freely supported in the up-down direction (pitching direction) and the left-right direction (yawing direction) with respect to the fixed frame via the pitching movement frame and the yawing movement frame.

Japanese Patent Laid-Open No. 2008-26634 (Patent Document 2) discloses a "shake stabilizer unit" including a correction optical member for correcting a shake of an image formed by an imaging optical system by moving in a direction crossing the optical axis of the imaging optical system. have. In the correction optical member disclosed in Patent Literature 2, the lens holding frame holding the correction lens is freely supported in the pitching direction and the yawing direction with respect to the accommodation cylinder via the pitching slider and the yawing slider.

Japanese Laid-Open Patent Publication No. 2006-215095 (Patent Document 3) discloses an "image shake correction device" which can move a correction lens with a small driving force and can perform a fast and highly accurate image shake correction. The image shake correction device disclosed in Patent Document 3 includes a holding frame for holding a correcting lens, a first slider for slidably supporting the holding frame in a first direction (pitching direction), and a holding frame in a second direction (yawing direction). A second slider for freely supporting the slide, a first coil motor for driving the first slider in the first direction, and a second coil motor for driving the second slider in the second direction.

Japanese Patent Laid-Open No. 2008-15159 (Patent Document 4) discloses a lens barrel provided with a shake optical system provided to be movable in a direction perpendicular to the optical axis. In the shake optical system disclosed in Patent Document 4, the movable VR unit disposed in the VR main body unit is provided so as to hold the correction lens (third lens group) and move in the XY plane perpendicular to the optical axis.

Japanese Patent Laid-Open No. 2007-212876 (Patent Document 5) makes it possible to move a corrected lens held in a moving frame in first and second directions orthogonal to each other with respect to an optical axis of the lens system, Disclosed is an "image shake correction device" which makes it possible to correct an image shake by controlling an optical axis to coincide with an optical axis of a lens system.

Japanese Patent Application Laid-Open No. 2007-17957 (Patent Document 6) discloses a correcting lens for correcting a shake of an image formed by a lens system in a first direction and a second direction that are orthogonal to each other and perpendicular to the optical axis of the lens system. Disclosed is an "image shake correction device" which is driven by the operation of a drive unit and corrects image shake. In the image stabilization apparatus disclosed in Patent Document 6, the lens driving unit is disposed on one side in a direction orthogonal to the optical axis of the correction lens.

Japanese Patent Application Laid-Open No. 2007-17874 (Patent Document 7) allows a corrected lens held in a moving frame to be movable in a first direction and a second direction orthogonal to each other and perpendicular to the optical axis of the lens system. Disclosed is an "image shake correction device" which makes it possible to correct an image shake by controlling the optical axis of the lens to coincide with the optical axis of a lens system. The image stabilization apparatus disclosed in this patent document 7 is provided with the drive means which has a coil and a magnet which became relatively movable. One of the coil and the magnet is fixed to the moving frame, and the other of the coil and the magnet is fixed to the supporting frame for supporting the moving frame. In addition, the image shake correction device disclosed in Patent Document 7 includes a first Hall element which detects positional information about a first direction of a correcting lens by detecting a magnetic force of a magnet, and positional information about a second direction of a correcting lens. It is provided with the 2nd hall element which detects by detecting the magnetic force of a magnet.

The image stabilization apparatus (image stabilization apparatus) disclosed in the above-mentioned patent documents 1 to 7 all has a structure in which the moving lens is moved and adjusted in a plane perpendicular to the optical axis. However, the image shake correction device (image stabilizer) having such a structure has a problem that the structure is complicated and is not suitable for miniaturization.

In order to solve this problem, a camera shake correction device (image shake correction device) which makes it possible to correct camera shake (image shake) by rocking the lens module (camera module) itself holding the lens and the image pickup device (image sensor) Proposed.

For example, Japanese Patent Application Laid-Open No. 2007-41455 (Patent Document 8) includes a lens module for holding a lens and an imaging element, a frame structure for rotatably supporting the lens module by a rotation shaft, and a dodge ball on a rotation shaft. And a driving means (actuator) for rotating the lens module with respect to the frame structure by applying a driving force to the eastern part (rotor), and a pressing means (plate spring) for pressing the driving means (actuator) to the driven part (rotor) of the rotation shaft. Disclosed is an image shake correction device of an optical device. The frame structure consists of an inner frame and an outer frame. The drive means (actuator) is arranged to abut on the driven portion (rotor) of the rotating shaft in a direction perpendicular to the optical axis. The drive means (actuator) consists of a piezoelectric element and an acting portion on the rotational shaft side. The acting portion drives the rotating shaft by the longitudinal vibration and the bending vibration of the piezoelectric element.

In addition, Japanese Patent Application Laid-Open No. 2007-93953 (Patent Document 9) accommodates a camera module incorporating a photographing lens and an image sensor in a casing, and perpendicularly crosses the camera module with a photographing optical axis and crosses at right angles to each other. Shake freely on the casing around the first and second shafts, and control the posture of the entire camera module inside the casing according to the vibration of the casing detected by the hand-shake sensor, resulting in camera shake during still image shooting. A camera shake correction device is disclosed. The camera shake correction apparatus disclosed in Patent Document 9 includes an intermediate frame that freely supports an inner frame to which the camera module is fixed, and swings freely about its first axis from the outside thereof, and is fixed to a casing to center the intermediate frame around the second axis from the outside thereof. First drive means which swings the inner frame around the first axis according to a shake signal from a shake sensor (a first sensor module that detects shake in the pitching direction), which is placed in the intermediate frame and the intermediate frame. And second driving means which is placed in the outer frame and oscillates the intermediate frame around the second axis in accordance with the shake signal from the shake sensor (second sensor module for detecting the shake in the yaw direction). The first driving means comprises: a first stepping motor, a first reduction gear train that decelerates its rotation, and a first cam follower which rotates integrally with the gear of the final stage to oscillate the inner frame through the first cam follower provided on the inner frame. It consists of a cam. The second drive means comprises a second stepping motor, a second reduction gear train for slowing its rotation, and a second cam for swinging the intermediate frame through a second cam follower installed in the intermediate frame by rotating integrally with the gear of the last stage. Is done.

Further, Japanese Patent Application Laid-Open No. 2007-142938 (Patent Document 10) discloses a portable information terminal having a function of correcting camera shake during shooting by using an angular velocity sensor such as a gyro. In order to correct camera shake, a reference pitching axis and yaw axis, which are orthogonal to each other, orthogonal to each other are set in a plane orthogonal to the optical axis of the camera lens. It is necessary to detect both angular velocities of the rotation serving as the central axis of rotation. Patent document 10 discloses arrange | positioning the 1st gyro which detects the rotational angular velocity of rotation about a pitching axis, and the 2nd gyro which detects the rotational angular velocity of rotation around a yaw axis, on the side surface of an imaging device.

Patent Document 1: Japanese Patent Application Laid-Open No. 2006-65352

Patent Document 2: Japanese Patent Application Laid-Open No. 2008-26634

Patent Document 3: Japanese Patent Application Laid-Open No. 2006-215095

Patent Document 4: Japanese Patent Application Laid-Open No. 2008-15159

Patent Document 5: Japanese Patent Application Laid-Open No. 2007-212876

Patent Document 6: Japanese Patent Application Laid-Open No. 2007-17957

Patent Document 7: Japanese Patent Application Laid-Open No. 2007-17874

Patent Document 8: Japanese Patent Application Laid-Open No. 2007-41455

Patent Document 9: Japanese Patent Application Laid-Open No. 2007-93953

Patent Document 10: Japanese Patent Application Laid-Open No. 2007-142938 (paragraph 0005, paragraph 0006, Fig. 2)

All of the image stabilization apparatuses (image stabilization apparatuses) disclosed in Patent Documents 1 to 7 described above have a problem in that the correction lens is moved and adjusted in a plane perpendicular to the optical axis, and thus the structure is complicated and does not suit miniaturization. .

On the other hand, in the image shake correction device disclosed in Patent Document 8, an actuator including a piezoelectric element and an acting portion on the rotational shaft side is used as a driving means (actuator). The rotor is driven by elliptical movement of the acting portion. If abrasion occurs at the working point of the rotor (driven part) and the acting part of the actuator, there is a fear that the correct contact is impaired. Therefore, in order to reduce this abrasion, it is necessary to use a special material as a rotor (driven part). Moreover, in the actuator which consists of a piezoelectric element and an action part, since an action part is made to contact a rotor (driven part), it is difficult to return a lens module to its neutral position (initial position).

In addition, in the camera shake correction apparatus disclosed in Patent Document 9, a combination of a stepping motor, a reduction gear train, and a cam is used as the driving means. Therefore, it is necessary to bring the cam follower into contact with the cam surface of the cam by the pressurization of the torsion spring. Therefore, the structure of a drive means becomes complicated. Moreover, since the cam follower makes contact with the cam surface of the cam, it is difficult to return the camera module to its neutral position (initial position).

In addition, the portable information terminal disclosed in Patent Document 10 merely discloses that an angular velocity sensor such as a gyro is used as the camera shake sensor.

Therefore, the subject of this invention is providing the image stabilizer with the simple structure of a drive means (actuator).

Another object of the present invention is to provide a camera shake correction device, which can easily return the camera module to its neutral position (initial position).

Other objects of the present invention will become clear as the description proceeds.

(Means to solve the task)

According to the present invention, the camera module 20 holding the lenses L1, L2, L3 and the image capturing element 28 has the first axis P and the first axis P perpendicular to the optical axis O and intersecting with each other. In an image stabilization device (30; 30A) which is designed to correct camera shake by oscillating around two axes (Y), an inner frame (32) for fixing the camera module (20) inside and an inner frame (outside thereof) The intermediate frame 34 which swings freely around the first axis P from the outside, the outer frame 36 which swings freely around the second axis Y from the outside thereof, and the inner frame The voice coil is provided at the bottom of the bottom and the outer frame, and drives the inner frame 32 and the intermediate frame 34 to swing around the first axis P and the second axis Y, respectively. A camera shake correction device having a motor 40 is obtained.

In the image stabilization apparatus 30 (30A) according to the present invention, the voice coil motor 40 is, for example, a four-pole magnetized magnet 42 attached to the bottom of the outer frame 36. And a 4-pole magnetized magnet 42 in which the 4-poles are rotated symmetrically around the central axis C of the outer frame, and the coil substrate 44 provided at the bottom of the inner frame 32 to face the 4-pole magnets. 4 coils 44-1, 44-2, 44-3, 44-4 which are arranged symmetrically about the optical axis O so as to span between adjacent magnetic poles of the 4-pole magnetized magnet 42. ) Is preferably composed of a coil substrate 44 and a neutral retaining plate 46 attached on the coil substrate to face the four-pole magnetized magnet in a state where four coils are sandwiched therebetween.

In the image stabilizer 30 according to the present invention, a position detecting means 50 for detecting the position of the inner frame 32 with respect to the outer frame 36 may be provided. The position detecting means 50 is mounted on the coil substrate 44, and detects the magnetic force of the four-pole magnetized magnet 42, thereby detecting the first position accompanying the fluctuation around the first axis P. FIG. The second position, which is mounted on the one-hole element 51 and the coil substrate 44 and detects the magnetic force of the four-pole magnetized magnet 42, detects the second position accompanying the swing around the second axis Y. You may be comprised from the 2nd hall element 52. FIG.

In the camera shake correction apparatus 30A according to the present invention, the outer frame 36 is fixed to the casing, and the inner frame 32 is first and second orthogonal to the first and second axes P and Y, respectively. You may have the outer wall which has two side surfaces 32-1 and 32-2. In this case, the camera shake correction apparatus 30A is attached to one of the first side surface 32-1 and the second side surface 32-2 of the outer wall of the inner frame, and the first shaft P of the inner frame 32. A first hand shake sensor 61 for detecting a hand shake in the vicinity of the inner side of the inner frame 32, and attached to the other of the first side face 32-1 and the second side face 32-2 of the outer wall of the inner frame. It is preferable to further have a second camera shake sensor 62 which detects the shake around the second axis Y. The first camera shake sensor may be composed of a first angular velocity sensor 61 that detects a rotational angular velocity around the first axis P, and the second camera shake sensor may detect a rotational angular velocity around the second axis Y. The second angular velocity sensor 62 may be configured. The 1st angular velocity sensor is comprised by the 1st gyro sensor 61, for example, and the 2nd angular velocity sensor is comprised by the 2nd gyro sensor 62, for example.

In addition, the code | symbol in the said parenthesis is attached for easy understanding, It is only an example, Of course, it is not limited to these.

In this invention, since the voice coil motor provided in the bottom part of an inner frame and the bottom part of an outer frame is used as a drive means (actuator), there exists an advantage that the structure of a drive means (actuator) becomes simple.

(The best mode for carrying out the invention)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

With reference to FIGS. 1-3, the camera unit 10 including the camera shake correction apparatus 30 by 1st Embodiment of this invention is demonstrated. 1 is an exploded perspective view illustrating the camera unit 10. FIG. 2 is a plan view of the camera unit 10 shown in FIG. 1. 3 is a front sectional view of the camera unit 10 shown in FIG. 1.

The camera unit 10 includes a camera module 20 and a camera shake correction device 30. The camera module 20 holds a lens and an imaging device which will be described later. The illustrated camera module 20 includes an autofocus lens drive unit.

The autofocus lens driving unit includes a lens movable portion and a lens driving portion. The lens driver drives the lens movable part while slidably supporting the lens movable part in the optical axis O direction.

The camera module 20 has a module casing 22. The module casing 22 includes a cup-shaped upper cover 24 and a lower base 26. The upper surface of the image cover 24 has a cylindrical portion 24a whose central axis is the optical axis O of the lens. On the other hand, an imaging device (to be described later) disposed on a substrate (not shown) is mounted at the center of the lower base 26. This imaging element captures an image of a subject formed by a lens (to be described later) and converts it into an electrical signal. The imaging element is configured by, for example, a charge coupled device (CCD) type image sensor, a complementary metal oxide semiconductor (CMOS) type image sensor, or the like.

The camera shake correction device 30 is for correcting the camera shake by swinging the camera module 20 around the first axis P and the second axis Y perpendicular to the optical axis O and intersecting with each other. . In the example of illustration, 1st axis P is a pitching axis extended in a pitching direction, and 2nd axis Y is a yawing axis extended in a yawing direction.

The camera shake correction apparatus 30 includes an inner frame 32, an intermediate frame 34, and an outer frame 36. The inner frame 32 is for fixing (holding) the camera module 20 therein. The inner frame 32 is a pair of pitching support shafts 32a and 32a projecting outward toward the intermediate frame 34 in the direction (pitching direction) of the first axis (pitching axis) P (in FIG. 1). Only one side). The intermediate frame 34 swings and supports the inner frame 32 freely around its first axis (pitching axis) P from its outside. For this reason, the intermediate frame 34 has a pair of pitching receiving parts (receiving holes) 34a and 34a extending in the direction (pitching direction) of the first axis (pitching axis) P. The pair of pitching support shafts 32a and 32a are inserted into the pitching receiving portions (supporting holes) 34a and 34a.

The intermediate frame 34 has a pair of yawing support shafts 34b and 34b projecting outwardly toward the outer frame 36 in the direction (yawing direction) of the second axis (yawing axis) Y (in FIG. 1). Only one side). The outer frame 36 freely supports the intermediate frame 34 from the outside thereof around the second axis (yaw shaft) Y. As shown in FIG. Therefore, the outer frame 36 has a pair of yaw receiving parts (receiving holes) 36a and 36a extending in the direction (yawing direction) of the second axis (yawing axis) Y, and the pair of these The pair of yawing support shafts 34b and 34b are inserted into the yawing receiving parts (receiving holes) 36a and 36a.

In addition, the outer frame 36 is fixed to the casing of the cellular phone 100 with a camera (FIG. 6) described later.

In the above embodiment, the biaxial fitting portion is formed in a circumferential shape of irregularities. That is, each of the pair of pitching support shafts 32a and 32a and the pair of the yawing support shafts 34b and 34b has a convex circumferential shape, and the pair of pitching receiving portions (receiving holes) 34a and 34a. And each of the pair of yawing receiving parts (receiving holes) 36a and 36a have a concave cylindrical shape. For this reason, there exists a possibility that clearance may generate | occur | produce a little in a biaxial fitting part. As a countermeasure, a support shaft may be made into a cone shape, and a receiving part (bending hole) may be made into bowl shape.

The image stabilizer 30 further includes a voice coil motor (VCM) 40 (to be described later) provided at the bottom of the inner frame 32 and the bottom of the outer frame 36. The voice coil motor 40 swings the inner frame 32 and the intermediate frame 34 around the first axis (pitching axis) P and the second axis (yawing axis) Y, respectively. Drive.

4 is an exploded perspective view showing the voice coil motor (VCM) 40 used in the image stabilizer 30.

Next, with reference to FIG. 3 and FIG. 4, the voice coil motor (VCM) 40 used for the camera shake correction apparatus 30 is demonstrated.

The voice coil motor (VCM) 40 has a 4-pole magnetized magnet 42 attached to the bottom of the outer frame 36 and a coil provided on the inner frame 32 opposite the 4-pole magnetized magnet 42. The board | substrate 44 and the neutral holding plate (yoke) 46 are comprised.

The four magnetic poles of the four-pole magnetized magnet 42 are provided in rotationally symmetry around the central axis C of the outer frame 36. The coil substrate 44 includes first to fourth coils 44-1, 44-2, which are symmetrically disposed about the optical axis O so as to span between adjacent magnetic poles of the four-pole magnetized magnet 42. 44-3, and 44-4) are arranged. The neutral retaining plate (yoke) 46 is attached on the coil substrate 44 to face the four-pole magnetized magnet 42 with the first to fourth coils 44-1 to 44-4 sandwiched therebetween. It is.

The coil substrate 44 shown is composed of a plurality of multilayer substrates. Therefore, the first to fourth coils 44-1 to 44-4 are formed inside the coil substrate (multilayer substrate) 44. As shown in FIG. The first coil 44-1 and the third coil 44-3 are one coil wire, and are formed in a plurality of layers of the coil substrate 44. That is, the 1st coil 44-1 and the 3rd coil 44-3 are connected in series. On the other hand, the second coil 44-2 and the fourth coil 44-4 are one coil wire, which is different from the layer on which the first coil 44-1 and the third coil 44-3 are formed. It is formed in different plural layers of different coil substrates 44. That is, the second coil 44-2 and the fourth coil 44-4 are connected in series.

As shown in FIG. 4, the first coil 44-1 and the third coil 44-3 are disposed away from each other in the pitching direction P from the optical axis O. As shown in FIG. The second coil 44-2 and the fourth coil 44-4 are disposed away from each other in the yawing direction Y from the optical axis O. Since the combination of the first coil 44-1 and the third coil 44-3 is used to swing the camera module 20 around the first axis (pitching axis) P, the pitching coil pattern Also called. The combination of the second coil 44-2 and the fourth coil 44-4 is used to swing the camera module 20 around the second axis (yaw shaft) Y, so it is also called a yaw coil pattern. It is called.

In a state in which no current flows in the first to fourth coils 44-1 to 44-4 (during non-energization), the neutral retaining plate (yoke) 46 moves the camera module 20 to its neutral position (initial position). It is arrange | positioned at the opposing surface of the 4-pole magnetizing magnet 42 so that it can hold | maintain. Therefore, at the time of non-energization, as is apparent from FIGS. 2 and 3, the optical axis O and the central axis C of the outer frame 36 coincide with each other.

The four-pole magnetized magnet 42 is disposed on the bottom surface of the outer frame 36 so as not to influence the magnetic field on the autofocus compatible camera module 20.

In addition, in the example of illustration, although the four-pole magnetization magnet is used as the magnet 42, of course, you may arrange | position four single-pole magnets of a flat plate.

The illustrated image stabilizer 30 further includes position detection means 50 for detecting the position of the inner frame 32 relative to the outer frame 36. The illustrated position detecting means 50 is composed of first and second hall elements 51 and 52 mounted on the coil substrate 44. The first Hall element 51 is mounted on the coil substrate 44 at a position away from the third coil 44-3 in the pitching direction P from the optical axis O. As shown in FIG. The second hall element 52 is mounted on the coil substrate 44 at a position away from the fourth coil 44-4 in the yaw direction Y from the optical axis O. As shown in FIG. The first Hall element 51 detects the first position (pitching position) accompanying the swing around the first axis (pitching axis) P by detecting the magnetic force of the four-pole magnetized magnet 42. The second hall element 52 detects the second position (yaw position) accompanying the swing around the second axis (yaw shaft) Y by detecting the magnetic force of the four-pole magnetized magnet 42.

Next, with reference to FIG. 5, operation | movement of the voice coil motor (VCM) 40 is demonstrated.

FIG. 5A shows the first to fourth coils 44-1 to 44-4 and the first and second Hall elements 51 and 52 formed on the four-pole magnetized magnet 42 and the coil substrate 44. As shown in FIG. Excerpt from the drawing. FIG. 5 (A) shows the arrangement when the first to fourth coils 44-1 to 44-4 are not energized. Therefore, the optical axis O and the central axis C of the outer frame 36 coincide with each other. In other words, the camera module 20 is placed in a neutral position (initial position). At this time, the first and second Hall elements 51 and 52 do not generate an output voltage.

In this state, as shown in Fig. 5A, it is assumed that current I flows through the first and second coils (pitching coil patterns) 44-1 and 44-3. In this case, by the interaction of the magnetic field (magnetic flux) of the 4-pole magnetized magnet 42 and the current I flowing through the pitching coil patterns 44-1 and 44-3, The electromagnetic force (thrust) F is generated in the coil patterns 44-1 and 44-3. As a result, the inner frame 32 (camera module 20) swings around the first axis (pitching axis) P. As shown in FIG.

FIG. 5B shows a state in which the position of the inner frame 32 (camera module 20) is out of position due to the electromagnetic force (thrust) F of the pitching coil patterns 44-1 and 44-3. It is a figure. By this position shift, reaction force as shown by the arrow of FIG. 5 (B) arises in the neutral holding plate (yoke) 46. FIG.

Where the thrust F of the coil shown in FIG. 5A and the reaction force generated in the neutral retaining plate (yoke) 46 are balanced, the inner frame 32 (camera module ( 20)) is maintained.

At this time, the first Hall element 51 is out of the first position (pitching position) with respect to the four-pole magnetized magnet 42, and thus generates a voltage corresponding to the first position (pitching position).

FIG. 5 has described the operation when the current I flows through the first and second coils (pitching coil patterns) 44-1 and 44-3, but the second and fourth coils (yoling coil patterns). The same works when the current I flows through the 44-2 and 44-4. That is, by the interaction of the magnetic field (magnetic flux) of the 4-pole magnetized magnet 42 and the current I flowing through the yaw coil patterns 44-2 and 44-4, the Fleming's left-hand law The electromagnetic force (thrust) F is generated in the patterns 44-2 and 44-4, and as a result, the inner frame 32 (camera module 20) is surrounded by the second axis (yaw axis) Y. Rocking. The inner frame 32 (camera module 20) is held relative to the outer frame 36 where the reaction force generated in the thrust F of the coil and the neutral retaining plate (yoke) 46 are balanced. Since the second Hall element 52 is out of the second position (yaw position) with respect to the four-pole magnetized magnet 42, it generates a voltage corresponding to the second position (yaw position).

FIG. 6 is a block diagram showing the configuration of the mobile phone with camera 100 mounted with the camera unit 10 shown in FIGS.

The camera module 20 holds a plurality of lenses L1, L2, L2 and the imaging element 28. In the example of illustration, the lens L2 is an autofocus lens.

The camera-equipped cellular phone 100 has an overall control unit 110. The overall control unit 110 incorporates the vibration correction control unit 112. The whole control part 100 is connected to the timing generator (TG) 122. The signal picked up by the imaging device 28 is supplied to an analog processing unit (AFE) 124. The timing generator (TG) 122 supplies a timing signal to the imaging device 28 and the analog processing unit (AFE) 124. The signal processed by the analog processing unit (AFE) 124 is processed by the image processing unit 126 and then recorded (stored) in the image memory 128. The image processing unit 126 and the image memory 128 are controlled by the overall control unit 110.

The display unit 130 and the image recording unit 132 are connected to the overall control unit 110. In addition, the whole control unit 110 transmits a focus command signal to the focus control unit 134. In response to the focus command signal, the focus control unit 134 moves the lens L2 in the camera module 20 along the optical axis. The overall controller 110 transmits a shutter control signal to the shutter driver 136. In response to the shutter control signal, the shutter driver 136 drives the shutter (not shown) of the camera unit 10.

FIG. 7 is a block diagram showing the configuration of the camera shake correction actuator 200 for controlling the camera shake correction apparatus (the camera shake correction mechanism) 30. As shown in FIG.

The casing (not shown) of the mobile phone with camera 100 includes a pitching direction gyro 202 for detecting vibration in the pitching direction (vibration around the pitching axis P), and a vibration in the yawing direction (yaw shaft ( Yawing direction gyro 204 for detecting the vibration of the surroundings of Y) is provided.

The pitching direction gyro 202 detects the angular velocity in the pitching direction and outputs a pitching direction angular velocity signal (first angular velocity signal) indicating the detected angular velocity in the pitching direction. The yawing direction gyro 204 detects the angular velocity in the yawing direction and outputs a yawing direction angular velocity signal (second angular velocity signal) indicating the detected angular velocity in the yawing direction. The first and second angular velocity signals are supplied to the vibration correction controller 112. The vibration correction control unit 112 is supplied with a shutter operation command signal from the shutter button 206.

The vibration correction control unit 112 includes a vibration detection circuit 212 for detecting the vibration of the casing of the cellular phone 100 with a camera from the first and second angular velocity detection signals, and a sequence control circuit 214 for receiving a shutter operation command signal. Has The vibration detection circuit 212 includes a filter circuit and an amplifier circuit. The vibration detection circuit 212 supplies a vibration detection signal to the vibration amount detection circuit 216. The vibration amount detection circuit 216 detects the vibration amount of the casing of the mobile phone with camera 100 from the vibration detection signal, and sends the vibration amount detection signal to the coefficient conversion circuit 218. The coefficient converting circuit 218 counts the vibration amount detection signal and sends the counted signal to the control circuit 220. The control circuit 220 is supplied with a position detection signal from the position detection means (position sensor) 50 provided in the image stabilizer (image stabilizer) 30.

In response to the counted signal, the control circuit 220 outputs a control signal such as to cancel the vibration detected by the vibration detection circuit 212 based on the position detection signal. The sequence control circuit 214 controls the timing of the vibration amount detection circuit 216, the coefficient conversion circuit 218, and the control circuit 220 in response to the shutter operation command signal. The control signal is supplied to the drive circuit 222.

As described above, the camera shake correction device (the camera shake correction mechanism) 30 is a voice coil motor 40 for pitching to swing the camera module 20 around the first axis (pitching axis) P. As shown in FIG. Yaw coil patterns 44-2, 44-4 and yaw coil patterns 44-2, 44-4 for swinging the camera module 20 around the second axis (yaw axis) Y are provided. Doing. The pitching coil patterns 44-1 and 44-3 are also called first direction actuators 44P, and the yawing coil patterns 44-2 and 44-4 are also referred to as second direction actuators 44Y. In any case, the camera shake correction device (the camera shake correction mechanism) 30 includes a first direction actuator 44P and a second direction actuator 44Y.

The drive circuit 222 drives the first directional actuator 44P and the second directional actuator 44Y in response to the control signal.

By this structure, the camera module 20 can be rocked so as to cancel the vibration of the casing of the mobile phone with camera 100. As a result, camera shake can be corrected.

With reference to FIG. 8, the camera unit 10A containing the camera shake correction apparatus 30A which concerns on 2nd Embodiment of this invention is demonstrated. FIG. 8 is a perspective view illustrating the camera unit 10A in a state where the four-pole magnetized magnet 42 and the outer frame 36 are removed.

The illustrated image stabilization circuit 30A further includes the first and second gyro sensors 61 and 62, except that the first and second hall elements 51 and 52 are deleted. 1 to 3 have the same configuration as the camera shake correction circuit 30 shown in FIGS. Therefore, the same reference numerals are given to the same components as those shown in FIGS. 1 to 3, and for the sake of simplicity, only different points will be described below.

The inner frame 32 has a first side face 32-1 orthogonal to the first axis (pitching axis) P and a second side face 32-2 orthogonal to the second axis (yawing axis) Y. FIG. It has an outer wall having. The first gyro sensor 61 is attached to the first side 32-1 of the outer wall of the inner frame 32, and the second gyro sensor 62 is the second side 32-of the outer wall of the inner frame 32. 2) is attached. The first gyro sensor 61 operates as a first angular velocity sensor that detects the rotational angular velocity around the first axis (pitching axis) P, and the second gyro sensor 62 operates the second axis (yawing axis) ( It operates as a second angular velocity sensor that detects the rotational angular velocity around Y). In other words, the first gyro sensor 61 acts as a first hand shake sensor for detecting hand shake around the first axis (pitching axis) P of the inner frame 32, and the second gyro sensor 62 It functions as a second camera shake sensor for detecting camera shake around the second axis (yaw shaft) Y of the inner frame 32.

Therefore, the first gyro sensor 61 is also called a pitching direction gyro, and the second gyro sensor 62 is also called a yawing direction gyro.

In the image stabilization circuit 30A shown in FIG. 8, the first gyro sensor 61 is attached to the first side surface 32-1 of the outer wall of the inner frame 32, and the second gyro sensor 62 is attached. Although it is attached to the 2nd side surface 32-2 of the outer wall of the inner frame 32, it may be reversed. That is, the first gyro sensor 61 may be attached to the second side surface 32-2 of the outer wall of the inner frame 32, and the second gyro sensor 62 may be attached to the first side of the outer wall of the inner frame 32. It may be attached to (32-1).

FIG. 9 is a block diagram showing the configuration of the camera shake correction actuator 200A for controlling the camera shake correction apparatus (shake stabilizer) 30A shown in FIG.

In the camera shake correction actuator 200 shown in FIG. 7, the pitching direction gyro 202 and the yawing direction gyro 204 are attached to the casing of the mobile phone with camera 100, but the camera shake correction actuator shown in FIG. In 200A), a 1st gyro sensor (pitching direction gyro) 61 and a 2nd gyro sensor (yawing direction gyro) 62 are attached directly to the image stabilizer (image stabilizer) 30A.

In addition, while the image stabilizer (image stabilizer) 30 shown in FIG. 7 includes a position sensor (hall element) 50, the image stabilizer (image stabilizer) 30A shown in FIG. 9 is 30A. Does not have such a position sensor (hall element) 50.

The camera shake correction actuator 200A shown in FIG. 9 has the same structure as the camera shake correction actuator 200 shown in FIG. 7 except that the structure (operation) of the vibration correction control unit is different as will be described later. Therefore, reference numeral 112A is attached to the vibration correction control unit.

The vibration correction control unit 112A has the same configuration as the vibration correction control unit 112 shown in FIG. 7 except that the operation of the control circuit is different from that shown in FIG. Therefore, 220A is denoted by the control circuit.

The control circuit 220A outputs a feedback control signal such that the output of the pitching direction gyro 61 and the yawing direction gyro 62 is minimized in response to the coefficient-converted signal supplied from the coefficient conversion circuit 218. do. In response to this feedback control signal, the drive circuit 222 drives the first directional actuator 44P and the second directional actuator 44Y.

By this structure, the camera module 20 can be rocked so that the vibration of the inner frame 32 of the lens unit 10A of the cellular phone with camera 100 can be canceled. As a result, camera shake can be corrected.

As described above, in the camera shake correction apparatus according to the present invention, the camera shake can be corrected as long as the camera module 20 is a standardized camera module.

As mentioned above, although this invention was demonstrated by the preferable embodiment, it is clear that various changes are possible for those skilled in the art within the range which does not deviate from the mind of this invention. For example, in the above embodiment, the voice coil motor is composed of a four-pole magnetized magnet provided on the outer frame and a coil substrate provided on the inner frame, but is not limited to the one having such a structure. For example, the voice coil motor may be constituted by a four-pole magnetized magnet provided on the inner frame and a coil substrate provided on the outer frame. In addition, in said 1st Embodiment, although the hall element is used as a position detection means (position sensor), you may use another position detection means (position sensor). In addition, in the said 2nd Embodiment, although the angular velocity sensor, such as a gyro sensor, is used as a shake sensor, you may use another shake sensor. In addition, EMC measures may be taken by attaching a conductive shield case to the outside of the camera unit.

1 is an exploded perspective view showing a camera unit including a camera shake correction device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the camera unit shown in FIG. 1.

3 is a front sectional view of the camera unit shown in FIG. 1.

FIG. 4 is an exploded perspective view showing the voice coil motor VCM used in the image stabilizer shown in FIG. 1.

FIG. 5 is a view for explaining the operation of the voice coil motor VCM shown in FIG. 4.

FIG. 6 is a block diagram showing the configuration of a mobile phone with a camera equipped with the camera unit shown in FIGS.

FIG. 7 is a block diagram showing the configuration of the image stabilizer actuator for controlling the image stabilizer (image stabilizer) shown in FIGS.

It is a perspective view which shows the camera unit containing the image stabilizer which concerns on 2nd Embodiment of this invention in the state which removed the 4-pole magnetizing magnet and an outer frame.

FIG. 9 is a block diagram showing the configuration of a camera shake correction actuator for controlling the camera shake correction apparatus (shake correction mechanism) shown in FIG.

(Explanation of the sign)

10, 10A Camera Unit 20 Camera Module

28 Imaging element 30, 30 A Image stabilizer (image stabilizer)

32 inner frame 32a pitching support shaft

34 Intermediate frame 34a Pitching stand (bending hole)

34b yaw support shaft 36 outer frame

36a Yawing Receptacle (Receiving Hole) 40 Voice Coil Motor (VCM)

42 4-pole magnetized magnet 44 coil board

44-1 to 44-4 Coil 44P First Directional Actuator

44Y 2nd direction actuator 46 neutral retaining plate (yoke)

50 position detecting means (position sensor) 51, 52 holes

61 1st Gyro Sensor (Pitching Direction Gyro)

62 2nd Gyro Sensor (Yaw Direction Gyro)

L1, L2, L3 Lens 100 Mobile Phone with Camera

112, 112A Vibration Correction Control 200, 200A Image Stabilization Actuator

202 Pitching Direction Gyro 204 Ying Direction Gyro

212 Vibration Detection Circuit 214 Sequence Control Circuit

216 Vibration Amount Detection Circuit 218 Coefficient Conversion Circuit

220, 220A control circuit 222 driving circuit

O Optical axis C Center of outer frame

P 1st axis (pitching axis, pitching direction) Y 2nd axis (yawing axis, yawing direction)

Claims (7)

In a camera shake correction apparatus, a camera module holding a lens and an imaging element is oscillated around a first axis and a second axis that are perpendicular to the optical axis and intersect with each other. An inner frame fixing the camera module therein; An intermediate frame which freely swings the inner frame from the outside to the circumference of the first axis, An outer frame that freely supports the intermediate frame from the outside to the circumference of the second axis; It is provided with the bottom part of the said inner frame and the bottom part of the said outer frame, and has the voice coil motor which drives the inner frame and the said intermediate frame to rock around the said 1st axis and the said 2nd axis, respectively, , The voice coil motor, A four-pole magnetized magnet attached to a bottom portion of the outer frame, wherein the four-pole magnetized magnet is provided in rotationally symmetry around a central axis of the outer frame; A coil substrate provided at the bottom of the inner frame opposite to the four-pole magnetized magnet, wherein four coils are arranged symmetrically about the optical axis so as to span between adjacent magnetic poles of the four-pole magnetized magnet. The coil substrate, And a neutral retaining plate attached to the coil substrate so as to face the four-pole magnetized magnet in a state where the four coils are sandwiched therebetween. delete The image stabilization apparatus according to claim 1, further comprising position detecting means for detecting a position of said inner frame relative to said outer frame. The method of claim 3, wherein the position detecting means, A first hall element mounted on the coil substrate and detecting a first position accompanying fluctuation around the first axis by detecting a magnetic force of the four-pole magnetized magnet; And a second hall element mounted on the coil substrate and configured to detect a second position accompanying fluctuation around the second axis by detecting a magnetic force of the quadrupole magnetized magnet. The method of claim 1, wherein the outer frame is fixed to the casing, The inner frame has outer walls having first and second sides orthogonal to the first and second axes, respectively, A first camera shake sensor attached to one of the first side surface and the second side surface of the outer wall of the inner frame and detecting a hand shake around the first axis of the inner frame; And a second hand shake sensor attached to the other of the first side and the second side of the outer wall of the inner frame and detecting a hand shake around the second axis of the inner frame. 6. The method of claim 5, wherein the first camera shake sensor comprises a first angular velocity sensor that detects a rotational angular velocity around the first axis, And said second camera shake sensor comprises a second angular velocity sensor for detecting a rotational angular velocity around said second axis. The method of claim 6, wherein the first angular velocity sensor is composed of a first gyro sensor, The second angular velocity sensor is a camera shake correction apparatus, characterized in that composed of a second gyro sensor.

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