JP2019159268A - Shake correction device - Google Patents

Abstract

To provide a shake correction device capable of reducing impact of high frequency noise generated from a coil.SOLUTION: A shake correction device 110 includes: a fixed part on which magnets 14, 15 are arranged; a movable part on which coils 11, 12 and an image pick-up device 1 are arranged and which moves with respect to the fixed part in a direction perpendicular to an optical axis O of the image pick-up device 1; and a conductive plate 6 preventing or reducing high frequency noise generated from the coils when current flows through the coils from affecting the image pick-up device.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shake correction apparatus that corrects a shake by moving a movable part provided with an image sensor with respect to a fixed part, for example.

  2. Description of the Related Art Conventionally, a technique for reducing power consumption by driving a voice coil motor (VCM) of a shake correction apparatus by a pulse width modulation method (PWM driving) is known. In PWM drive, a current pulsating at a high frequency flows through the coil of the VCM. Thereby, AC magnetic flux (high frequency noise) pulsating at a high frequency is generated from the coil. When this high-frequency noise enters the image sensor, it may become horizontal stripe noise.

  A technique is known in which a coil is arranged obliquely with respect to a non-magnetic metal plate holding an image sensor in order to prevent a problem that high-frequency noise from the coil enters the image sensor (for example, Patent Document 1). In the apparatus of Patent Document 1, the magnetic flux from the coil passing through the nonmagnetic metal plate is reduced by arranging the coil obliquely with respect to the nonmagnetic metal plate. Thereby, the eddy current generated in the nonmagnetic metal plate is reduced, and the influence of the magnetic field due to the eddy current transmitted through the nonmagnetic metal plate on the image sensor is reduced.

JP, 2006-5061, A

  However, the conventional apparatus described above does not consider high-frequency noise that directly enters the image sensor from the coil. For this reason, it is necessary to dispose the coil at a certain distance from the image sensor, and the size of the apparatus increases accordingly.

  In other words, the above-described conventional technique cannot be applied to the high frequency noise countermeasure of the shake correction apparatus. In the shake correction device, an imaging element is provided in a movable part, one of a coil and a magnet is disposed in a fixed part, and the other of the coil and the magnet is disposed in a movable part. In order to reduce the size of the shake correction apparatus, it is necessary to dispose the coil close to the image sensor, and high-frequency noise generated from the coil easily enters the image sensor directly.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a shake correction apparatus that can reduce the influence of high-frequency noise generated from a coil.

  According to one aspect of the shake correction apparatus of the present invention, the magnet and the other one of the coils disposed opposite to the magnet are disposed, the other of the magnet and the coil, and the image sensor are disposed, A movable part that moves in a direction perpendicular to the optical axis of the image sensor, and a high-frequency blocker that prevents or reduces the influence of high-frequency noise generated from the coil when the current is passed through the coil on the image sensor, It has.

  Further, according to one aspect of the shake correction device of the present invention, the magnet and the other one of the coils arranged opposite to the magnet are disposed, the other of the magnet and the coil, and the image sensor are disposed, and the stationary unit In contrast, the movable part provided to be movable in a direction perpendicular to the optical axis of the image sensor, and a direction in which the movable part is perpendicular to the optical axis with respect to the fixed part by passing a current by a pulse width modulation driving method through the coil And a high-frequency cutoff unit that prevents or reduces the influence of high-frequency noise generated from the coil when the current flows through the coil on the image sensor.

  ADVANTAGE OF THE INVENTION According to this invention, the blurring correction apparatus which can reduce the influence of the high frequency noise which generate | occur | produces from a coil can be provided.

FIG. 1 is a schematic diagram of a camera including a shake correction apparatus according to the embodiment. FIG. 2 is a schematic perspective view of a shake correction apparatus incorporated in the camera body of FIG. FIG. 3 is a schematic diagram of the shake correction apparatus according to the first embodiment. FIG. 4 is a perspective view showing a nonmagnetic conductive plate used in the shake correction apparatus of FIG. FIG. 5 is a diagram showing an example in which the shape of the conductive plate in FIG. 4 is changed in the surface direction. FIG. 6 is a diagram illustrating an example in which the shape in the thickness direction of the conductive plate in FIG. 4 is changed. FIG. 7 is a schematic diagram of a shake correction apparatus according to the second embodiment. FIG. 8 is a schematic diagram of a shake correction apparatus according to the third embodiment. FIG. 9 is a schematic diagram of a shake correction apparatus according to the fourth embodiment. FIG. 10 is a schematic diagram of a shake correction apparatus according to the fifth embodiment. FIG. 11 is a schematic diagram showing a modification of the shake correction apparatus of FIG. FIG. 12 is a schematic diagram of a shake correction apparatus according to the sixth embodiment. FIG. 13 is a schematic diagram of a shake correction apparatus according to the seventh embodiment. FIG. 14 is a schematic diagram of a shake correction apparatus according to the eighth embodiment. FIG. 15 is a schematic diagram of a shake correction apparatus according to the ninth embodiment. FIG. 16 is a schematic diagram of a shake correction apparatus according to the tenth embodiment. FIG. 17 is a schematic diagram of a shake correction apparatus according to the eleventh embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In the drawings used for the following description, the scale may be different for each component in order to make each component large enough to be recognized on the drawing. It is not limited only to the quantity of the component described in (1), the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

  In the following description, the direction from the camera body 100 toward the subject (not shown) is referred to as the front, and the opposite is referred to as the rear. Furthermore, an axis that coincides with the optical axis O of the optical system that the lens unit 200 constitutes is defined as a Z axis, and two axes that are orthogonal to each other on a plane orthogonal to the Z axis are defined as an X axis and a Y axis. In each figure, an X axis, a Y axis, and a Z axis are illustrated as appropriate.

  As shown in FIG. 1, the camera body 100 has a housing 101 that forms an outer shell thereof. The camera body 100 includes a shake correction device 10 according to an embodiment of the present invention in a housing 101.

  The lens unit 200 is detachably attached to the camera body 100. The lens unit 200 includes a shake correction device 20. The blur correction device 20 of the lens unit 200 corrects blur by moving a specific lens among the plurality of lenses arranged on the optical axis O in a direction perpendicular to the optical axis O.

  As shown in FIG. 2, the shake correction device 10 of the camera body 100 is separated from the movable unit 2 including the imaging element 1 on which an image of the subject is formed via the lens unit 200, and behind the movable unit 2. And fixed portions 4 arranged in parallel. The fixing unit 4 is fixed to the camera body 100. The movable part 2 is supported in a float state with respect to the fixed part 4. The movable part 2 moves in a direction perpendicular to the optical axis O of the image sensor 1 with respect to the fixed part 4.

  The movable part 2 includes three coils 11, 12, 13 and three Hall elements 17, 18, 19 in addition to the image sensor 1. The fixed portion 4 includes three drive magnets 14, 15, 16 facing the coils 11, 12, 13. Alternatively, the fixed portion 4 may include the coils 11, 12, and 13, and the movable portion 2 may include the driving magnets 14, 15, and 16 that face the coils 11, 12, and 13 in the optical axis O direction, respectively. In FIG. 2, the Y driving magnet 16 and the hall element 19 for detecting the position in the Y direction are not shown.

  When a current is passed through the coils 11, 12, and 13, magnetic flux is generated from the coils 11, 12, and 13, and the movable portion 2 is XY relative to the fixed portion 4 due to electromagnetic induction between the magnets 14, 15, and 16. Move along a plane. The moving direction of the movable part 2 is determined by the direction of the current flowing through the coils 11, 12, 13. That is, the shake correction apparatus 10 moves the movable part 2 relative to the fixed part 4 along a plane (XY plane) orthogonal to the optical axis O (Z axis) of light incident on the image sensor 1. The camera shake of the camera body 100 is corrected.

  The imaging element 1 is disposed in front of the movable part 2 and is fixed to the movable part 2. Two X driving coils 11, 12 and one Y driving coil 13 are arranged behind the movable part 2. These three coils 11, 12, 13 are fixed to the movable part 2. Yes. Each of the coils 11, 12, and 13 is attached to the movable unit 2 so that the air core portion is in a posture parallel to the optical axis O. The two X driving coils 11 and 12 are provided apart from each other in the illustrated vertical direction (Y direction). The Y driving coil 13 is disposed between the two X driving coils 11 and 12 along the Y direction.

  The fixed portion 4 is disposed behind the movable portion 2 along the optical axis O. Between the movable part 2 and the fixed part 4, a plurality of spherical rolling elements (not shown) are arranged. The movable part 2 is biased toward the fixed part 4 by a plurality of tension springs (not shown). That is, the movable part 2 is supported so as to be movable in a direction perpendicular to the optical axis O in a non-contact state with respect to the fixed part 4 with a plurality of rolling elements interposed therebetween.

  Two X driving magnets 14 and 15 that are opposed to the two X driving coils 11 and 12 of the movable unit 2 are fixed to the fixed portion 4. In addition, one Y driving magnet 16 (not shown) facing the one Y driving coil 13 of the movable unit 2 is fixed to the fixed portion 4.

  Hall elements 17 and 18 for X-direction position detection provided corresponding to the X driving magnets 14 and 15 are fixed to the movable portion 2. The movable portion 2 is fixedly provided with a hall element 19 (not shown) for detecting the position in the Y direction facing the Y driving magnet 16. These three Hall elements 17, 18, 19 detect the relative position of the movable part 2 with respect to the fixed part 4 by detecting a change in magnetic flux.

  Hereinafter, a plurality of embodiments of the above-described shake correction apparatus 10 will be described. In each embodiment, components that function in the same manner as the shake correction apparatus 10 described above are assigned the same reference numerals, and detailed descriptions thereof are omitted. In each embodiment, for easy understanding of the description, the layout of each component of the shake correction apparatus 10 is appropriately changed and shown. In each embodiment, in addition to the driving magnets 14 and 15, the position detecting magnets 7 and 8 facing the hall elements 17 and 18 are provided. In each embodiment, the illustration and description of the Y drive configuration are omitted, and only the X drive configuration is described. However, the same configuration for reflecting or absorbing high-frequency noise is also used in the Y drive configuration. A configuration is provided.

(First embodiment)
FIG. 3 shows a schematic diagram of the shake correction apparatus 110 according to the first embodiment, in which the movable part 2 and the fixed part 4 are omitted. Hereinafter, in the description of each embodiment, illustration and description of the movable portion 2 and the fixed portion 4 are omitted. The shake correction apparatus 110 includes a power feeding unit 5 that allows a high-frequency current to flow through the X driving coils 11 and 12 (hereinafter simply referred to as the coils 11 and 12). The power feeding unit 5 creates a sinusoidal alternating current that is optimal for blur correction by periodically changing the on-time width of voltage pulses having a constant period. That is, the power feeding unit 5 causes a current by a pulse width modulation method to flow through the coils 11 and 12. That is, the shake correction apparatus 110 of the present embodiment employs PWM driving that consumes relatively little power.

  In the PWM drive, a current pulsating at a high frequency flows through the coils 11 and 12 of the VCM. As a result, an alternating magnetic flux pulsating at a high frequency is generated from the coils 11 and 12. AC magnetic flux causes high frequency noise. When this high-frequency noise enters the image sensor 1, for example, there is a possibility that it becomes horizontal stripe noise. Further, the high frequency noise may adversely affect the position detection accuracy by the Hall elements 17 and 18. For this reason, the shake correction apparatus 110 of the present embodiment has a configuration for reflecting or absorbing at least partially high-frequency noise generated from the coils 11 and 12.

  The blur correction device 110 includes nonmagnetic conductive plates 6 and 6 (plate-like bodies) at both ends along the air core portions of the coils 11 and 12. In other words, the conductive plates 6 and 6 are arranged in contact with one opening side of the coils 11 and 12 and the other opening side of the coils 11 and 12 in the optical axis direction. The conductive plate 6 functions as a high frequency cutoff unit for at least partially reflecting or absorbing high frequency noise generated from the coils 11 and 12.

  More specifically, one conductive plate 6 is disposed between the printed circuit board 3 on which the image pickup device 1 is mounted and the coils 11 and 12. The other conductive plate 6 is arranged on the side where the coils 11 and 12 face the X driving magnets 14 and 15 (hereinafter simply referred to as magnets 14 and 15), respectively. The conductive plates 6 and 6 are bonded and fixed to the coils 11 and 12 using, for example, a double-sided tape or an adhesive so as to close the openings at both ends of the air core portions of the coils 11 and 12.

  In the present embodiment, the conductive plate 6 is disposed at both ends of the air core portion of each of the coils 11 and 12, but the conductive plate 6 may be disposed to face at least one end portion of the air core portion. For example, even when the conductive plate 6 is disposed only at the end of the coils 11, 12 on the magnet 14, 15 side, a magnetic flux having a relatively high magnetic flux density along the air core passes through the conductive plate 6. At this time, an eddy current is generated on the surface of the conductive plate 6 and the magnetic flux passing through the conductive plate 6 is weakened.

  That is, even when the conductive plate 6 is provided only on the magnets 14 and 15 side of the coils 11 and 12, the magnetic flux generated on the opposite side of the coils 11 and 12 (printed circuit board 3 side) can be weakened. The high frequency noise generated from 11 and 12 can be reduced as a whole. Needless to say, the effect of canceling high-frequency noise is higher when the conductive plate 6 is provided on both sides of the coils 11 and 12 than when the conductive plate 6 is provided only on one side of the coils 11 and 12.

  The conductive plate 6 is made of a nonmagnetic conductive member such as copper, aluminum, or an alloy containing these, and has a thickness of 2 μm to 0.3 mm, for example. When the high frequency magnetic flux generated from the coils 11 and 12 by the PWM drive passes through the conductive plate 6, an eddy current in a direction to cancel the passing magnetic flux is generated on the surface of the conductive plate 6. In other words, the conductive plate 6 absorbs high-frequency noise at least partially by generating eddy currents. It has been found that the conductive plate 6 absorbs almost all the high frequency magnetic flux of 100 kHz or more generated from the coils 11 and 12 by having a thickness of 0.1 mm or more.

  Alternatively, the conductive plate 6 reflects the high-frequency magnetic flux at least partially. The magnetic flux reflected by the conductive plate 6 reverses the direction of the magnetic flux and at least partially cancels the magnetic flux from the magnet 14 (15). As a result, the high-frequency magnetic flux is weakened.

  In order to effectively reflect or absorb high-frequency noise using the conductive plate 6, it is desirable to dispose the conductive plate 6 at a position where the high-frequency magnetic flux passes in a direction crossing the magnetic flux. In the present embodiment, the conductive plates 6 are disposed at both ends of the air core where the magnetic flux generated from the coils 11 and 12 is the densest, in a posture orthogonal to the magnetic flux. Therefore, according to this embodiment, the high frequency noise generated from the coils 11 and 12 can be reflected or absorbed most effectively.

  On the other hand, the nonmagnetic conductive plate 6 such as copper or aluminum passes a magnetic flux having a relatively low frequency (for example, 20 Hz or less) like the driving frequency of the VCM. For this reason, even if the conductive plate 6 is provided near the coils 11 and 12, the VCM drive is not affected.

  The shape of the conductive plate 6 may be a flat rectangular plate or sheet shown in FIG. 4, and the surface shape of the plate or sheet is not rectangular but curved as shown in FIG. It may be a plate-like body 6 ′ or a plate-like body 6 ″ having a shape curved in the thickness direction as shown in FIG. 6. That is, the shape of the conductive plate 6 is limited to a flat rectangular plate shape. Instead, it may be a plate-like body or sheet having a thickness of about 0.1 mm in the direction in which the magnetic flux passes.

  As described above, according to the first embodiment, since the conductive plate 6 made of a nonmagnetic conductive member is disposed opposite to the air core portions of the coils 11 and 12, high frequency noise generated from the coils is effectively canceled out. be able to. Thereby, it is possible to almost eliminate the adverse effects such as the above-described lateral stripe noise on the image sensor 1. Further, according to the present embodiment, high frequency noise entering the Hall elements 17 and 18 can also be reduced.

(Second to tenth embodiments)
Hereinafter, second to tenth embodiments will be described with reference to FIGS. 7 to 16.
In each embodiment described below, the coils 11 and 12 are connected to the power feeding unit 5 (not shown) described in the first embodiment. That is, in all of the following embodiments, PWM driving with relatively low power consumption is adopted.

  As shown in FIG. 7, the shake correction apparatus 120 according to the second embodiment includes a cylindrical nonmagnetic conductive member 121 (high-frequency cutoff unit, conductive plate) arranged along the outer periphery of the coil 11 (12). Have. The conductive member 121 includes a portion disposed between the coil 11 (12) and the image sensor 1. When the conductive member 121 is arranged so as to surround the outer side of the coil along the winding direction of the coil 11 (12) as described above, the high-frequency magnetic flux exiting from the coil 11 (12) toward the image sensor 1 is at least partially canceled. be able to.

  As illustrated in FIG. 8, the shake correction device 130 according to the third embodiment includes a nonmagnetic conductive plate 131 (high-frequency cutoff unit) having an L-shaped cross section. That is, the conductive plate 131 includes a plate-like body 131 a disposed between the coil 11 (12) and the magnet 14 (15), and a plate-like body disposed between the coil 11 (12) and the imaging element 1. 131b and are integrally connected. The plate-like bodies 131a and 131b are not necessarily connected and may be separated.

  The plate-like body 131a is bonded and fixed to the end of the coil 11 (12) where the air core part faces the magnet 14 (15). The plate-like body 131b extends continuously in the direction orthogonal to the plate-like body 131a at the end portion of the plate-like body 131a close to the imaging element 1, and is adhesively fixed to the side surface of the coil 11 (12) on the imaging element 1 side. Has been.

  The plate-like body 131a disposed at one end of the air core portion has a high effect of canceling high-frequency noise generated from the coil 11 (12) because the highest density magnetic flux generated from the coil 11 (12) passes therethrough. Further, since the plate-like body 131b arranged between the coil 11 (12) and the image pickup device 1 is arranged on the image pickup device 1 side that is easily affected by high-frequency noise, imaging is performed in combination with the plate-like body 131a. High frequency noise entering the element 1 can be reduced more effectively.

  As shown in FIG. 9, the shake correction apparatus 140 according to the fourth embodiment includes a nonmagnetic conductive plate 141 (high-frequency cutoff unit) having an L-shaped cross section. That is, the conductive plate 141 includes a plate-like body 141 a disposed between the printed circuit board 3 and the coil 11 (12), and a plate-like body 141 b disposed between the coil 11 (12) and the imaging device 1. , Are connected together. The plate-like bodies 141a and 141b are not necessarily connected and may be separated.

  The plate-like body 141a is disposed on the mounting surface of the printed circuit board 3, that is, the surface 3a. The coil 11 (12) is bonded and fixed to the surface 3a side of the printed circuit board 3 with the plate-like body 141a interposed therebetween. The plate-like body 141b extends continuously in the direction perpendicular to the plate-like body 141a at the end of the plate-like body 141a close to the image pickup device 1, and is adhesively fixed to the side surface of the coil 11 (12) on the image pickup device 1 side. Has been.

  The plate-like body 141a disposed at one end of the air core portion has a high canceling effect on high-frequency noise generated from the coil 11 (12) because the highest density magnetic flux generated from the coil 11 (12) passes therethrough. Further, since the plate-like body 141b arranged between the coil 11 (12) and the image pickup device 1 is arranged on the Hall element 17 (18) side that is easily affected by high-frequency noise, it is combined with the plate-like body 141a. Thus, high frequency noise entering the Hall element 17 (18) can be effectively reduced. Thereby, the fall of the position detection precision by the influence of a high frequency noise can be suppressed.

  As shown in FIG. 10, the shake correction apparatus 150 according to the fifth embodiment includes coils 11 and 12 and hall elements 17 and 18 on the back surface 3b side opposite to the front surface 3a of the printed circuit board 3 on which the imaging device 1 is mounted. It has. The hall element 17 (18) is disposed in the air core portion of the coil 11 (12). The blur correction device 150 includes a sheet-like nonmagnetic conductive member 151 (high-frequency blocking unit, conductive plate, conductive film) between the coil 11 (12) and the Hall element 17 (18). At this time, it is necessary to insulate the terminal portion so that each terminal of the Hall element 17 (18) does not conduct with the conductive member 151.

  The conductive member 151 has a size that covers the end face of the coil 11 (12) along the optical axis O direction. The conductive member 151 covers the Hall element 17 (18) provided on the back surface 3b of the printed circuit board 3, and the coil 11 (12) is disposed on the back surface 3b side of the printed circuit board 3 with the conductive member 151 interposed therebetween. . The conductive member 151 may be a non-magnetic metal plate partially curved, or may be a non-magnetic metal material applied in a film form. The conductive member 151 has a thickness of 2 μm to 100 μm.

  Since the conductive member 151 is provided at one end of the air core part through which the magnetic flux of the coil 11 (12) passes at high density, the high-frequency noise generated from the coil 11 (12) can be effectively canceled. In addition, since the conductive member 151 is disposed between the coil 11 (12) and the Hall element 17 (18), high-frequency noise entering the Hall element 17 (18) from the coil 11 (12) is effectively reduced. Can be made. Furthermore, the conductive member 151 has a function of reducing high frequency noise entering the image sensor 1.

  FIG. 11 shows a modification of the shake correction apparatus 150 of the fifth embodiment described above. The shake correction apparatus 150 ′ according to this modification has the same structure as the shake correction apparatus 150 of the fifth embodiment described above except that the conductive member 152 (high-frequency cutoff unit) having a smaller area than the conductive member 151 described above is used. Have. The conductive member 152 has a size that closes one end of the air core portion of the coil 11 (12) on the printed circuit board 3 side, and is disposed inside the outer peripheral edge of the coil 11 (12).

  Since the conductive member 152 has a size that closes one end of the air-core portion of the coil 11 (12), it allows a magnetic flux having a high magnetic flux density to pass therethrough. In other words, high frequency noise generated from the coil 11 (12) can be most effectively canceled by disposing the conductive member 152 at a position where at least one end of the air core portion is closed as in this modification. Further, compared with the fifth embodiment described above, the size of the conductive member can be reduced, and accordingly, the material cost can be reduced, the apparatus can be reduced in weight, and the movable portion 2 can be reduced. Drive response performance can be improved.

  As shown in FIG. 12, the shake correction apparatus 160 according to the sixth embodiment includes a Hall element 17 (18) on the surface 3 a of the printed board 3 on which the imaging element 1 is mounted. A position detecting magnet 7 (8) is provided in front of the hall element 17 (18) so as to be spaced apart from each other. A yoke 162 is provided on the surface 3 a of the printed circuit board 3. The Hall element 17 (18) is provided on the surface 3a side of the printed circuit board 3 with the yoke 162 interposed therebetween. The yoke 162 functions as a magnetic spring in cooperation with the driving magnet 14 (15). The magnetic spring is provided in place of the tension spring that biases the movable portion 2 toward the fixed portion 4.

  Further, the blur correction device 160 includes a coil 11 (12) on the back surface 3b side of the printed circuit board 3. On the back surface 3b of the printed circuit board 3, a nonmagnetic conductive plate 161 (high-frequency cutoff unit) is provided. The conductive plate 161 is disposed between the back surface 3b of the printed circuit board 3 and the coil 11 (12). The conductive plate 161 has a size that covers at least the end surface along the air core of the coil 11 (12).

  The conductive plate 161 of the present embodiment is disposed between the coil 11 (12) and the Hall element 17 (18), and is disposed between the coil 11 (12) and the imaging element 1. For this reason, it is possible to effectively reduce high-frequency noise that enters the Hall element 17 (18) from the coil 11 (12), and to effectively reduce high-frequency noise that enters the image sensor 1 from the coil 11 (12). Can do.

  As shown in FIG. 13, the shake correction apparatus 170 according to the seventh embodiment includes a Hall element 17 (18) on the surface 3 a of the printed board 3 on which the imaging element 1 is mounted. A position detecting magnet 7 (8) is provided in front of the hall element 17 (18) so as to be spaced apart from each other. A non-magnetic conductive plate 171 (high-frequency cutoff unit) is provided on the surface 3 a of the printed circuit board 3. The Hall element 17 (18) is provided on the surface 3a side of the printed circuit board 3 with the conductive plate 171 interposed therebetween.

  In addition, the shake correction device 170 includes a coil 11 (12) on the back surface 3 b side of the printed circuit board 3. A non-magnetic conductive plate 172 (high-frequency cutoff unit) is provided on the back surface 3b of the printed circuit board 3. The conductive plate 172 is disposed between the back surface 3b of the printed circuit board 3 and the coil 11 (12). The conductive plate 172 has a size that covers at least the end surface along the air core of the coil 11 (12).

  The conductive plates 171 and 172 of this embodiment are disposed between the coil 11 (12) and the Hall element 17 (18), and are disposed between the coil 11 (12) and the image sensor 1. For this reason, it is possible to effectively reduce high-frequency noise that enters the Hall element 17 (18) from the coil 11 (12), and to effectively reduce high-frequency noise that enters the image sensor 1 from the coil 11 (12). Can do.

  As shown in FIG. 14, the shake correction apparatus 180 according to the eighth embodiment includes a coil 11 (12) on the surface 3 a of the printed circuit board 3 on which the imaging device 1 is mounted. A driving magnet 14 (15) is provided in front of the coil 11 (12) so as to face and separate from the coil 11 (12). A non-magnetic conductive plate 181 (high-frequency cutoff unit) is provided on the surface 3 a of the printed circuit board 3. The coil 11 (12) is provided on the surface 3a side of the printed circuit board 3 with the conductive plate 181 interposed therebetween.

  Further, the shake correction device 180 includes a hall element 17 (18) on the back surface 3b side of the printed circuit board 3. Further, a magnet 7 (8) for position detection is provided behind the hall element 17 (18) so as to be separated from and opposed to the hall element 17 (18). Further, a heat radiating member 183 is connected to the conductive plate 181 via a heat transfer member 182.

  The coil 11 (12) generates heat by PWM driving and is heated to a high temperature of about 100 ° C. Moreover, since the coil 11 (12) is provided in the movable part 2 supported in the float state with respect to the fixed system of the camera main body 100, it is difficult for heat to escape to other members. For this reason, in this embodiment, the heat radiating member 183 was connected to the conductive plate 181 in contact with the coil 11 (12) via the heat transfer member 182 to cool the coil 11 (12).

  That is, in the eighth embodiment, by providing the conductive plate 181 at one end of the air core portion of the coil 11 (12), high-frequency noise generated from the coil 11 (12) can be reduced, and the conductive plate Coil 11 (12) can be cooled by thermally connecting 181 to heat dissipation member 183.

  As shown in FIG. 15, the shake correction apparatus 190 according to the ninth embodiment includes a Hall element 17 (18) on the back surface 3 b side of the printed circuit board 3. The coil 11 (12) is fixed behind the hall element 17 (18) via a holding plate (not shown). Further, a driving magnet 14 (15) is provided behind and spaced from the coil 11 (12). The magnet 14 (15) also functions as a position detection magnet.

  Note that a conductive film 191 (high-frequency cutoff unit) made of a nonmagnetic conductive member is provided on the entire surface of the coil 11 (12). The conductive film 191 is provided not only on the outer surface of the coil 11 (12) but also on the inner surface facing the air core. The conductive film 191 is applied to the entire surface of the coil 11 (12) by dipping or plating the coil 11 (12) on a nonmagnetic conductive agent.

  By providing the conductive film 191 on the entire surface of the coil 11 (12) as in the present embodiment, high-frequency noise generated from the coil 11 (12) can be effectively canceled out. For this reason, regardless of the layout of the device configuration arranged around the coil 11 (12), the influence of high frequency noise can be reduced, and the degree of freedom in designing the shake correction device 190 can be increased.

  As illustrated in FIG. 16, the shake correction apparatus 300 according to the tenth embodiment includes driving magnets 14 and 15 on the back surface 3 b side of the printed circuit board 3 on which the imaging element 1 is mounted. That is, in the shake correction apparatus 300 of the present embodiment, the magnets 14 and 15 are provided in the movable part 2, and the coils 11 and 12 are provided in the fixed part 4. Hall elements 17 and 18 and coils 11 and 12 facing the rear of the magnet are fixed to the fixed portion 4.

  As described in the first to ninth embodiments, high-frequency noise enters the image sensor 1 and the hall elements 17 and 18 by providing a non-magnetic conductive member in the path of the magnetic flux emitted from the coils 11 and 12. Problems can be prevented or suppressed. That is, every place can be assumed as a position where the nonmagnetic conductive member is provided. In the present embodiment, a non-magnetic conductive plate 301 (high frequency blocking portion) is bonded and fixed in front of the coils 11 and 12 fixed to the fixing portion 4, and the Hall element 17 (18) is further forward of the conductive plate 301. Fixed.

  In addition to this, as the place where the conductive plate 301 is provided, the front surface 3a of the printed circuit board 3 (between the front surface 3a of the printed circuit board 3 and the imaging device 1), the back surface 3b of the printed circuit board 3 (the back surface 3b of the printed circuit board 3 and the magnet 14 ( 15)), the rear surface of the magnet 14 (15), the rear end surface of the coil 11 (12), and the like. In any case, the high-frequency noise generated from the coils 11 and 12 can be at least partially canceled by providing a nonmagnetic conductive member at a position where the magnetic flux emitted from the coils 11 and 12 passes.

  As shown in FIG. 17, the shake correction apparatus 310 according to the eleventh embodiment includes a Hall element 17 (18) at a position overlapping the imaging element 1 in the optical axis O direction. The hall element 17 (18) is disposed in the air core portion of the coil 11 (12). That is, the air core part of the coil 11 (12) is arranged in a region where the image sensor 1 is projected in the optical axis direction. The structure other than this is the same as the shake correction apparatus 150 of the fifth embodiment described above. The nonmagnetic conductive member 151 (high-frequency blocking portion, conductive plate, conductive film) is disposed between the Hall element 17 (18) and the coil 11 (12) so as to cover the Hall element 17 (18). At this time, it is necessary to insulate the terminal portion so that each terminal of the Hall element 17 (18) does not conduct with the conductive member 151.

  Since the conductive member 151 is provided at one end of the air core part through which the magnetic flux of the coil 11 (12) passes at high density, the high-frequency noise generated from the coil 11 (12) can be effectively canceled. In addition, since the conductive member 151 is disposed between the coil 11 (12) and the Hall element 17 (18), high-frequency noise entering the Hall element 17 (18) from the coil 11 (12) is effectively reduced. Can be made. Furthermore, the conductive member 151 has a function of reducing high frequency noise entering the image sensor 1.

  In other words, according to the present embodiment, the imaging device 1 is disposed at a position overlapping the air core portion of the coil 11 (12) in the direction of the optical axis O. If the image pickup device 1 is arranged at a position overlapping the air core portion of the coil 11 (12) without providing the conductive member 151, high frequency noise adversely affects the image pickup device 1. However, high frequency noise entering the image sensor 1 can be suppressed by disposing the conductive member 151 at a position overlapping the air core portion of the coil 11 (12) as in the present embodiment. For this reason, according to this embodiment, the image pick-up element 1 can be arrange | positioned in the optical axis direction of the coil 11 (12), and an apparatus structure can be reduced in size.

  In addition, this invention is not limited to embodiment mentioned above, It can change arbitrarily, without exceeding the range of invention.

  DESCRIPTION OF SYMBOLS 1 ... Imaging device, 2 ... Movable part, 4 ... Fixed part, 5 ... Power feeding part, 6 ... Conductive plate, 7, 8 ... Magnet for position detection, 10 ... Shake correction apparatus, 11, 12 ... Coil for X drive, DESCRIPTION OF SYMBOLS 13 ... Coil for Y drive, 14, 15 ... Magnet for X drive, 16 ... Magnet for Y drive, 17, 18, 19 ... Hall element, 100 ... Camera body, 121, 151, 152 ... Conductive member, 131, 141, 161, 171, 172, 181, 301 ... conductive plate, 182 ... heat transfer member, 183 ... heat dissipation member, 191 ... conductive film, O ... optical axis.

Claims (11)

A fixed portion in which one of a magnet and a coil arranged to face the magnet is disposed;
A movable part in which the other of the magnet and the coil and the image sensor are arranged and move in a direction perpendicular to the optical axis of the image sensor with respect to the fixed part;
A high-frequency cutoff unit that prevents or reduces the influence of high-frequency noise generated from the coil when the current is passed through the coil on the imaging device;
A blur correction apparatus comprising:   The blur correction apparatus according to claim 1, wherein the high-frequency cutoff unit is made of a nonmagnetic conductive member.   The non-magnetic conductive member is a plate-like body or sheet, and is disposed on at least one side of one opening side of the coil or the other opening side of the coil in the optical axis direction of the imaging element. The shake correction apparatus according to claim 2, wherein the shake correction apparatus is provided.   The blur correction apparatus according to claim 2 or 3, wherein the plate-like body or sheet is disposed between the coil and the imaging device.   The blur correction device according to claim 4, wherein the plate-like body or the sheet is disposed in contact with the surface of the opening of the coil. The imaging device is disposed on a printed circuit board,
The blur correction apparatus according to claim 1, wherein the high-frequency cutoff unit is disposed on a surface of the printed circuit board.   The blur correction apparatus according to claim 1, wherein the high-frequency cutoff unit is a nonmagnetic conductive film. The imaging device is disposed on a printed circuit board,
8. The blur correction apparatus according to claim 7, wherein the conductive film is applied to at least one surface of the coil, the magnet, or the printed board.   The blur correction device according to claim 2, further comprising a heat transfer member that thermally connects the plate-like body to the heat dissipation member. A fixed portion in which one of a magnet and a coil arranged to face the magnet is disposed;
The movable part provided such that the other of the magnet and the coil and the image sensor are arranged and movable with respect to the fixed part in a direction perpendicular to the optical axis of the image sensor;
A power feeding part that moves the movable part in a direction perpendicular to the optical axis with respect to the fixed part by flowing a current by a pulse width modulation driving method to the coil;
A high-frequency cutoff unit that prevents or reduces the influence of high-frequency noise generated from the coil when the current is passed through the coil on the imaging device;
A blur correction apparatus comprising:   The air core part of the coil is located in the optical axis direction projection part of the image sensor, and the plate-like body or sheet is disposed at a position covering at least the air core part between the image sensor and the coil. The blur correction apparatus according to claim 3, wherein: