JP2017021101A - Lens barrel, image blur correction device, and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of highly accurate driving control by making an image blur correction unit small and light.SOLUTION: A lens barrel 2 comprises: a lens holding frame 96 for holding a second group lens 95; a magnet 70 provided on the lens holding frame 96 and having two-layer structure in an optical axis direction; and two coils 93a and 93b arranged so as to interpose the magnet 70 therebetween in the optical axis direction. The magnet 70 is magnetized so as to have two or more poles when viewed from the optical axis direction. The coils 93a and 93b are each arranged so that they face the different pole boundaries orthogonal to each other of the magnet 70 and overlap partly when viewed from the optical axis direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lens barrel, an image blur correction device, and an imaging device.

  There are known imaging apparatuses such as digital cameras that are provided with a retractable lens barrel that extends from the imaging apparatus body during imaging and retracts into the imaging apparatus body when not in use. In addition, there is a demand for higher optical zoom magnification and improved portability.

  Here, in recent years, it has become common for an imaging apparatus to include an image blur correction unit that corrects image distortion due to camera shake. Since the image blur correcting unit has a large number of parts and a complicated structure, reducing the size and weight of the image blur correcting unit contributes to reducing the size and weight of the imaging apparatus.

  Therefore, Patent Document 1 proposes an image blur correction unit that drives a shift barrel including an image blur correction lens in two orthogonal directions within a plane orthogonal to the optical axis. Specifically, in the image blur correction unit described in Patent Document 1, a guide is provided between a shift barrel that holds an image blur correction lens and a shift base barrel that is a fixed barrel in the optical axis direction. A member is placed. At this time, the magnet provided in the guide portion is sandwiched by two coils provided in each of the shift barrel and the shift base barrel from both sides in the optical axis direction. The guide portion can move only in the yaw direction with respect to the shift base barrel by the guide V-groove and the rolling ball. Further, the shift barrel can be moved only in the pitch direction with respect to the guide portion by the guide V-groove and the rolling ball.

  Therefore, the shift lens barrel can move in the yaw direction as the guide member moves in the yaw direction, and can move in the pitch direction with respect to the guide member that is restricted from moving in the pitch direction. Can do. Thus, the image blur correction lens held in the shift barrel can move in the yaw direction and the pitch direction orthogonal to each other in a plane orthogonal to the optical axis.

JP 2014-035477 A

  However, in the technique described in Patent Document 1, it is necessary to dispose a guide portion between the shift base barrel and the shift barrel that holds the image blur correction lens, and in the pitch direction and the yaw direction, respectively. A total of six rolling balls are required to regulate. Therefore, there is a problem that the number of parts increases and the weight increases, and the occupied volume of the parts increases, that is, the lens barrel increases in size.

  In addition, since the magnet is sandwiched between coils and the pitch direction and the yaw direction are controlled separately, the shift lens barrel that holds the image blur correction lens that needs to move in the pitch direction and the yaw direction must The coil needs to be arranged. In that case, since it is necessary to twist the wiring of the flexible printed circuit board and the like necessary for energizing the coil, a load that drags the flexible printed circuit board is generated in the shift column, and this load increases the shift column. It becomes an obstacle to control accurately.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel that can reduce the number of parts constituting an image blur correction unit, reduce the size and weight of the image blur correction unit, and enable high-precision drive control.

  The lens barrel according to the present invention is a lens barrel including a lens, and is provided with a lens holding frame that holds the lens, and the lens holding frame, and has a two-layer structure in the optical axis direction of the lens barrel. One magnet having and two coils arranged so as to sandwich the magnet in the optical axis direction, and the magnet is magnetized to two or more poles when viewed from the optical axis direction, Each of the two coils is disposed so as to face different magnetic pole boundary portions orthogonal to each other and partially overlap when viewed from the optical axis direction. To do.

  According to the present invention, the number of parts constituting the image blur correction unit can be reduced, and the image blur correction unit can be reduced in size and weight. Furthermore, since high-precision drive control of the image blur correction unit is possible, a good image blur correction effect can be obtained.

1 is an external perspective view showing a schematic configuration of an imaging apparatus according to an embodiment of the present invention. It is a disassembled perspective view of the lens barrel with which the imaging device shown in FIG. 1 is provided. FIG. 3 is an exploded perspective view of a second group barrel that constitutes the lens barrel shown in FIG. 2 according to the first embodiment of the present invention. FIGS. 4A and 4B are a front view and a cross-sectional view showing a configuration of main parts of an image blur correction unit in the second group barrel shown in FIG. 3. It is a figure explaining the structure of the magnet used for the image blurring correction unit shown in FIG. It is a front view explaining the relationship between the area | region used for image stabilization in each of the 2 group lens barrel shown in FIG. It is the front view and side view which show the structure of the main components of the image blurring correction unit which concerns on 2nd Embodiment of this invention which comprises the 2 group lens barrel shown in FIG. It is the front view and side view which show the structure of the main components of the image blurring correction unit which concerns on 3rd Embodiment of this invention which comprises the 2 group lens barrel shown in FIG. It is a front view explaining the structure of the L-shaped magnet with which the image blurring correction unit shown in FIG. 8 is provided. It is the rear view and side view which show the structure of the main components of the image blurring correction unit which concerns on 4th Embodiment of this invention which comprises the 2 group barrel shown in FIG. It is a front view explaining the structure of the L-shaped magnet with which the image blurring correction unit shown in FIG. It is the rear view which compared the lens holding frame used in 2nd and 3rd embodiment with the lens holding frame used in 4th Embodiment. It is the front view and side view explaining arrangement | positioning of the position detection element in 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is an external perspective view showing a schematic configuration of an imaging apparatus 1 according to an embodiment of the present invention. The imaging apparatus 1 is typically a so-called compact type digital camera, and generally includes a camera body 1A and a lens barrel 2.

  On the front surface of the lens barrel 2, a lens barrier device 3 (see FIG. 2) that opens and closes the optical path of the photographing lens according to the power on / off of the imaging device 1 is disposed. Is shown open. The lens barrel 2 is retracted (retracted) in the camera body 1A when the power of the imaging device 1 is off, and the power of the imaging device 1 is on as shown in FIG. This is a collapsible lens barrel that is extended from the camera body 1A. The lens barrel 2 is configured as a zoom lens barrel capable of changing the focal length (imaging field angle).

  A pop-up strobe device 4 is disposed on the upper surface of the camera body 1A. The strobe device 4 irradiates the subject with illumination light (strobe light) as necessary. Further, a release button 6 for starting a shooting preparation operation (autofocus operation, automatic exposure operation, etc.) is provided on the upper surface of the camera body 1A, and a finder window 5 is provided on the front of the camera body 1A. Is provided. The configuration of the imaging device 1 is not limited to that shown in FIG.

  FIG. 2 is an exploded perspective view of the lens barrel 2. The lens barrel 2 includes a first group barrel 7, an aperture unit 8, a second group barrel 9, a moving cam ring 10, a rectilinear barrel 11, a third group barrel 12, a fixed barrel 13, an image sensor holding member 14, and a barrel drive. A motor 15 and a lens barrel flexible substrate 16 are provided.

  The first group barrel 7 holds a first group photographing lens and includes a lens barrier device 3. The diaphragm unit 8 includes a diaphragm mechanism that adjusts the amount of light, and a diaphragm flexible substrate 81 is wound around the drive unit of the diaphragm unit 8. The second group lens barrel 9 holds a second group photographing lens, and includes an image blur correction unit (image blur correction device) and a shutter, and a shutter / vibration-proof flexible substrate 91 (hereinafter referred to as “an image blur correction unit” and a shutter drive unit). The anti-vibration FPC 91 ”is crawled. The movable cam ring 10 includes a drive cam for driving the first group barrel 7, the aperture unit 8, and the second group barrel 9 on the inner peripheral portion, and a gear portion to which power is transmitted from the barrel drive motor 15. 101.

  The rectilinear cylinder 11 is rotatably held by the movable cam ring 10 and restricts the first group barrel 7, the aperture unit 8 and the second group barrel 9 to go straight. The third group barrel 12 holds a third group photographing lens. The fixed cylinder 13 includes a drive cam for driving the moving cam ring 10 on the inner peripheral portion. The image sensor holding member 14 holds the image sensor. The light that has passed through the lens barrel 2 forms an optical image on the image sensor, and the image sensor converts the optical image into image data by photoelectric conversion.

  The lens barrel flexible substrate 16 is attached to a control circuit (not shown) provided in the camera body 1A, and the control circuit supplies power and control signals to various drive units provided in the lens barrel 2, and the lens barrel flexible substrate. 16 to supply. The diaphragm flexible substrate 81 and the vibration-proof FPC 91 are connected to the lens barrel flexible substrate 16 by a connector outside the fixed tube 13. The configuration of the lens barrel 2 is not limited to the above configuration as long as the configuration of the image blur correction unit described below can be applied.

  FIG. 3 is an exploded perspective view of the second group barrel 9 (second group barrel according to the first embodiment). The second group barrel 9 includes a base member 90, a vibration-proof FPC 91, a cover member 92, coils 93a and 93b, position detection elements 94a and 94b, a second group lens 95, a lens holding frame 96, a spring 97, and a ball 98.

  The base member 90 is a base of the second group lens barrel 9 and moves forward and backward in the optical axis direction when the follower pins 90f arranged at 120 ° equally move along the drive cam of the moving cam ring 10. The anti-vibration FPC 91 is provided with coils 93a and 93b and position detection elements 94a and 94b, and is electrically connected to a shutter drive unit 90d that drives a shutter mechanism (not shown) disposed on the imaging surface side of the base member 90. Connected to. The position detection elements 94a and 94b are, for example, known Hall elements.

  The lens holding frame 96 holds the second group lens 95 that is an image blur correction lens. One magnet 70 is fixed to the lens holding frame 96 by bonding or insert molding. The spring 97 biases the lens holding frame 96 toward the imaging surface with respect to the base member 90, and in the optical axis direction between a hook portion 96 f of the lens holding frame 96 and a hook portion (not shown) of the base member 90. It is hung. The ball 98 is held in the optical axis direction by a ball receiving portion 90a provided on the base member 90 and a ball receiving portion 96g (see FIGS. 4 and 13) provided on the lens holding frame 96, and the lens holding frame 96 is used as a base. The member 90 is rolled in a plane orthogonal to the optical axis direction.

  The cover member 92 restricts the lens holding frame 96 from floating in the optical axis direction. The cover member 92 is engaged with the hook portion 92 a of the cover member 92 and the projection portion 90 c of the base member 90, and the boss 90 b of the base member 90 is fitted into the hole portion 92 b of the cover member 92, whereby the cover member 92 is inserted into the base member 90. Positioning and fixing.

  The coil 93 a and the position detection element 94 a mounted on the vibration-proof FPC 91 are positioned by the boss 92 c of the cover member 92 and the hole 91 a of the vibration-proof FPC 91 and are arranged on the subject side with respect to the magnet 70. On the other hand, the coil 93b and the position detection element 94b mounted on the vibration-proof FPC 91 are positioned by the boss 90g (see FIG. 4B) of the base member 90 and the hole 91b of the vibration-proof FPC 91, and are positioned relative to the magnet 70. Arranged on the imaging surface side. As described above, the second group lens barrel 9 is configured such that the coils 93 a and 93 b sandwich the magnet 70 by rolling the anti-vibration FPC 91 forward and backward of the base member 90. By adopting such a configuration, it is possible to reduce the driving load caused by the anti-vibration FPC 91 when the lens holding frame 96 is driven as described later, and to enable highly accurate drive control of the lens holding frame 96. A good image blur correction effect can be obtained.

  FIG. 4A is a front view of main components constituting the image blur correction unit in the second group lens barrel 9 as seen from the subject side, and FIG. 4B is a view of arrow A shown in FIG. It is sectional drawing in -A. In FIG. 4A, the cover member 92 is not shown. The coils 93a and 93b are substantially the same, but the arrangement form in the lens barrel 2 is different. The coils 93a and 93b have a straight line part (long side part) and a curvature part (short side part). The coils 93a and 93b are arranged so as to sandwich the magnet 70 in the optical axis direction, and are arranged so that the longitudinal direction of the coil 93b and the longitudinal direction of the coil 93a are orthogonal to each other when viewed from the optical axis direction. Has been.

  FIG. 5 is a diagram illustrating the configuration of the magnet 70, and the Z direction shown in FIG. 5 indicates the direction from the imaging surface side toward the subject side. The magnet 70 having a substantially square shape when viewed from the optical axis direction has a two-layer structure in the optical axis direction. The magnet on the subject side is magnetized to a total of 4 poles (N pole 70a, S pole 70b, N pole 70c, S pole 70d) in 2 rows and 2 columns, and the magnetic pole boundary portion of each pole has a cross shape. . Similarly, the magnet on the imaging surface side is also magnetized to a total of 4 poles (S pole 70e, N pole 70f, S pole 70g, N pole 70h) in 2 rows and 2 columns, and the magnetic pole boundary portion of each pole is a cross shape. It has become. In the optical axis direction, the N pole 70a, the S pole 70b, the N pole 70c, and the S pole 70d face the S pole 70e, the N pole 70f, the S pole 70g, and the N pole 70h, respectively.

  The coil 93a is disposed so as to include a magnetic pole boundary 71a between the N pole 70a and the S pole 70d on the subject side. The coil 93b is disposed so as to include a magnetic pole boundary 71h between the S pole 70g and the N pole 70h on the imaging surface side. Thereby, one pole of the S pole 70d and the N pole 70h of the magnet 70 is shared by the coil 93a and the coil 93b. Further, since the magnetic pole boundary 71a and the magnetic pole boundary 71h are included in the coil 93a and the coil 93b, as shown in FIG. 4A, a part of the coil 93a and the coil 93b can be seen from the optical axis direction. Duplicate when. Thereby, compared with the case where the coils 93a and 93b are arranged in the same direction with respect to the magnet 70, space saving in the direction orthogonal to the optical axis can be achieved, and the second group barrel 9 can be downsized.

  The lens holding frame 96 that holds the second group lens 95 is driven in the X direction by energizing the coil 93a (supplying a drive signal) and driven in the Y direction by energizing the coil 93b according to the Fleming left-hand rule. That is, the lens holding frame 96 can be moved in a plane orthogonal to the optical axis by controlling the energization of each of the coils 93a and 93b.

  The magnet 70 has a structure in which each of the two layers in the optical axis direction is magnetized to four poles. Therefore, the R portion (end portion in the longitudinal direction) of the coil 93a exceeds the magnetic pole boundary portion 71b between the N pole 70a and the S pole 70b and the magnetic pole boundary portion 71d between the N pole 70c and the S pole 70d, and is opposite to the magnetic pole. Get in. Similarly, the R portion of the coil 93b enters the opposite magnetic pole beyond the magnetic pole boundary 71e between the S pole 70e and the N pole 70h and the magnetic pole boundary 71g between the N pole 70f and the S pole 70g. Therefore, the magnet 70 receives a force (reaction force) in the direction opposite to the direction in which the lens holding frame 96 is to be driven. However, since the area of these curvature portions with respect to the straight portion of the coil 93a (the portion sandwiched between the curvature portions at the ends in the longitudinal direction) and the straight portion of the coil 93b is small and the influence as a whole is small, it can be ignored. As a method of further reducing the influence of the reaction force, there is a method of enlarging the magnet 70 and lengthening the straight portion of the coil 93a or the straight portion of the coil 93b.

  When using the magnet 70 magnetized with four poles in each of the two layers in the optical axis direction, one pole of the S pole 70 b and the N pole 70 f is not used for driving the lens holding frame 96. However, as shown in FIG. 4, it is possible to detect the position of the lens holding frame 96 in the X direction by arranging the position detection element 94a at the magnetic pole boundary 71c between the S pole 70b and the N pole 70c. Similarly, the position of the lens holding frame 96 in the Y direction can be detected by arranging the position detection element 94b at the magnetic pole boundary 71f between the N pole 70f and the S pole 70e. That is, the four poles magnetized by the magnet 70 can be effectively used for the vibration isolation drive and the position detection. In addition, the rectangular magnet 70 magnetized to four poles has an advantage that it can be manufactured at low cost without any trouble in forming the magnetized yoke because it is easy to cut out and has a good magnetization balance.

  Next, the arrangement of the ball 98 and the coils 93a and 93b will be described. In order to hold the lens holding frame 96 with respect to the base member 90 in a well-balanced manner, one of the three balls 98 that support the lens holding frame 96 having a substantially symmetric shape with respect to the Y axis is arranged on the Y axis. It is desirable to be arranged. Here, when the longitudinal direction of the coil 93a is arranged along the Y axis, the coil 93b can be arranged on the imaging surface side sandwiching the magnet 70 so that the longitudinal direction thereof is along the X axis. A space for arranging one ball 98 on the top can be easily secured.

  In the present embodiment, the coil 93b is disposed so as to include the magnetic pole boundary 71h. However, the coil 93b includes the magnetic pole boundary 71f that is symmetrical to the magnetic pole boundary 71h with respect to the Y axis. You may arrange in. In any case, since the longitudinal direction of the coil 93b is parallel to the X axis, there is a space on the Y axis, so that one of the three balls 98 can be arranged on the Y axis.

  If the coil 93a and the ball 98 are arranged apart from each other in the optical axis direction, and the coil 93a and the ball 98 overlap when viewed from the optical axis direction (see FIG. 4A), 2 It is efficient in reducing the size of the group barrel 9. At this time, as shown in FIG. 4B, it is most preferable that the coil 93b and one of the three balls 98 are at substantially the same position in the optical axis direction, because no useless space is generated.

  FIG. 6A is a front view for explaining the relationship between the region A used for image stabilization in the second group lens barrel 9 and the region B usable other than image stabilization, as in FIG. 4A. A state viewed from the subject side is shown. The area B that can be used for other than the image stabilization can be used as, for example, a space 90e (see FIG. 3) in which the drive unit (not shown) of the aperture unit 8 enters when the shutter drive unit 90d and the barrel 2 are retracted. The region B can also be used as a space for arranging a screw, a guide shaft, and the like for moving the third group lens barrel 12 back and forth.

  FIG. 6B is a diagram for explaining a region A1 used for image stabilization and a region B1 usable for other than image stabilization in a conventional lens barrel using two magnets. In the conventional lens barrel, the area B1 is filled up only by arranging the space 90e into which the shutter drive unit 90d and the drive unit of the aperture unit 8 enter.

  6A and 6B, as is clear from the comparison between FIGS. 6A and 6B, in the first embodiment, it is assumed that the shutter drive unit 90d having the same size as the conventional example and the space 90e into which the drive unit of the aperture unit 8 enters are provided. But there is enough space. Therefore, using this space, other parts can be laid out around the image blur correction unit, and the entire lens barrel 2 can be reduced in size.

  As one of the reasons that the parts constituting the image blur correction unit in the first embodiment are small, the configuration in which only one magnet 70 is used reduces the occupied volume of the magnet itself and reduces the weight. It is possible to plan. Along with this, the volume of the lens holding frame 96 that holds the magnet 70 can be reduced, and this also makes it possible to reduce the size and weight. Thus, since the entire lens holding frame 96 is reduced in size and weight, the driving force for driving the lens holding frame 96 may be small, so that the coils 93a and 93b can be reduced in size.

  As described above, in the first embodiment, by using one square magnet 70 magnetized with four poles, the number of parts can be reduced and the cost can be reduced, and the lens can be held. The frame 96 can be reduced in size and weight. As a result, the entire image blur correction unit that drives the lens holding frame 96 can be reduced in size and weight. In addition, since the degree of freedom in layout of the peripheral components constituting the second group barrel 9 can be improved, the second group barrel 9 can be reduced in size and weight, and as a result, in the optical axis direction of the camera body 1A. Can be made thinner.

Second Embodiment
In the first embodiment, the image blur correction unit is configured using a rectangular plate-shaped magnet 70 magnetized with four poles. On the other hand, in the second embodiment, an image blur correction unit that drives the lens holding frame is configured by using an L-shaped magnet magnetized with three poles.

  FIG. 7 is a front view and a side view showing the configuration of the main components of the image blur correction unit according to the second embodiment of the present invention provided in the second group barrel 9. More specifically, FIG. 7A is a front view showing the positional relationship among the L-shaped magnet 70L, the lens holding frame 96A, the coils 93a and 93b, the position detection elements 94a and 94b, and the ball 98 as viewed from the subject side. FIG.7 (b) is a side view corresponding to Fig.7 (a). In the second embodiment, in order to change a part of the shape of the lens holding frame 96 used in the first embodiment, the reference numeral of the lens holding frame is changed to “96A”.

  The L-shaped magnet 70L has a structure in which one pole (S pole 70b and N pole 70f) not used for driving the lens holding frame 96 in the magnet 70 described in the first embodiment is removed. That is, the L-shaped magnet 70L has an L-shaped shape and has a structure magnetized to three poles so that three magnetic poles having a substantially square equivalent shape are formed from one end to the other end. .

  In the following description, regarding the L-shaped magnet 70L, the same configuration as the magnet 70 described in the first embodiment (for example, the magnetic pole (magnetized state)) is denoted by the same reference numeral, and is common to the first embodiment. Description of the configuration to be performed is omitted.

  The L-shaped magnet 70L has an edge 70p that is not in contact with the other magnetic poles of the S pole 70d and the N pole 70h, is arranged on the Y axis away from the optical axis, and opens on the optical axis side so as to be an inverted V shape. The lens holding frame 96A is fixed so as to be symmetric with respect to the Y axis. In other words, the L-shaped magnet 70L is equivalent to a magnet obtained by removing the S pole 70b and the N pole 70f from the magnet 70 and rotating counterclockwise by 45 degrees when viewed from the subject side. Accordingly, the coils 93a and 93b are also arranged by being rotated 45 degrees counterclockwise from the state shown in FIG. Therefore, the coils 93a and 93b share one central pole among the three magnetic poles formed on the L-shaped magnet 70L on the subject side and the imaging surface side in the optical axis direction. The mode of sharing the magnetic pole is the same as in the first embodiment.

  The driving method of the lens holding frame 96A by the L-shaped magnet 70L and the coils 93a and 93b is the same as that in the first embodiment. Therefore, the description of the driving method is omitted, and the characteristics when the L-shaped magnet 70L is used will be described below.

  The lens holding frame 96A can be driven even in the configuration in which the S pole 70b and the N pole 70f are removed from the magnet 70 in which each of the two layers in the optical axis direction is magnetized to four poles as described in the first embodiment. It is. On the other hand, by arranging the L-shaped magnet 70L as shown in FIG. 7A, the second group lens 95 can be inserted into the region C from which the S pole 70b and the N pole 70f have been removed. In other words, the region C is defined as a space formed between the magnetic poles at one end and the other end of the L-shaped magnet 70L in the direction connecting the magnetic poles at one end and the other end of the L-shaped magnet 70L. be able to. Therefore, the lens holding frame 96A can be made smaller than the lens holding frame 96.

For example, it is assumed that the planar shape when the magnet 70 described in the first embodiment is viewed from the subject side is a D × D square. In this case, the distance in the Y direction from the two optical axis-side edges 70q of the L-shaped magnet 70L in FIG. 7A to the edge 70p on the Y-axis is 3 × 2 ^1/2 × D / 4 ( ≈1.06D). Compared with the distance in the Y direction, the magnet 70 is slightly shorter than the L-shaped magnet 70L.

  However, when the L-shaped magnet 70L can be brought close to the second group lens 95, the second group lens 95 can be inserted inside a line connecting the two edges 70q. The area that can be inserted becomes wider as the curvature of becomes smaller. Thereby, the difference with the magnet 70 exceeds 0.06D, and the lens holding frame 96A can be downsized in the Y-axis direction.

  It is not preferable that the second group lens 95 and the L-shaped magnet 70L are in direct contact with each other. Therefore, it is desirable to interpose the molding material of the lens holding frame 96A between the second group lens 95 and the L-shaped magnet 70L. Even in this case, since the thickness of the interposition part can be set thin in consideration of molding accuracy, mechanical strength, etc., it is impossible to reduce the size in the Y-axis direction by providing the interposition part. There is nothing.

  In the second embodiment, the driving direction of the lens holding frame 96A is the X direction and the Y direction in the first embodiment, whereas in the second embodiment, the X1 direction shown in FIG. Y1 direction. At this time, as in the first embodiment, a slight force (reaction force) is generated in the direction opposite to the direction to be driven by the magnetic field of the adjacent magnetic pole, but the magnetic pole for one pole is removed. The reaction force is weaker than that of the first embodiment and can be substantially ignored.

  Further, although the position detection of the lens holding frame 96A is performed using the position detection elements 94a and 94b, in the second embodiment, the magnetic pole boundary not included in the coil 93a faces the coil 93b in the optical axis direction. ing. Similarly, the magnetic pole boundary not included in the coil 93b faces the coil 93a in the optical axis direction. In this case, position detection can be performed by arranging the position detection element 94a at a position facing the air core part of the coil 93a and the position detection element 94b at a position facing the air core part of the coil 93b.

  As described above, in the second embodiment, the weight can be reduced by using the L-shaped magnet 70L from which a part of the magnet 70 used in the first embodiment is removed. Further, by using the L-shaped magnet 70L, an insertion space for the second group lens 95 is generated. Thereby, further miniaturization is possible in the direction (Y direction) connecting the second group lens 95 and the L-shaped magnet 70L.

<Third Embodiment>
In the third embodiment, the lens holding frame 96A is driven using an L-shaped magnet magnetized with two poles. FIG. 8 is a front view and a side view showing the configuration of the main components of the image blur correction unit according to the third embodiment of the present invention provided in the second group barrel 9. More specifically, FIG. 8A is a front view showing the positional relationship among the L-shaped magnet 72, the lens holding frame 96A, the coils 93a and 93b, the position detection elements 94a and 94b, and the ball 98 as viewed from the subject side. FIG. 8B is a side view corresponding to FIG. FIG. 9 is a front view for explaining the configuration (magnetized state) of the L-shaped magnet 72, and the Z direction in the figure is the direction toward the subject.

  The L-shaped magnet 72 has a two-layer structure in the optical axis direction, and the subject-side magnet is magnetized to two poles of an S pole 72a and an N pole 72b along the L shape, and is on the imaging surface side. This magnet is magnetized to two poles, an N pole 72c and an S pole 72d. In the optical axis direction, the S pole 72a faces the N pole 72c, and the N pole 72b faces the S pole 72d.

  The coils 93a and 93b are respectively arranged with the magnetic boundary of the L-shaped magnet 72 as the center in the longitudinal direction. Here, the coil 93a is sandwiched between the L-shaped magnet 72 and the coil 93b is disposed on the imaging surface side. Are arranged respectively. Unlike the second embodiment, in the third embodiment, the coils 93a and 93b are arranged so as to follow the shape of the L-shaped magnet 72, that is, the longitudinal direction of the coil 93a is parallel to the Y1 direction. It arrange | positions so that a direction may become parallel to a X1 direction. Therefore, when viewed from the optical axis direction, the amount of protrusion of the coils 93a, 93b from the L-shaped magnet 72 is small, thereby further reducing the space required in the direction orthogonal to the optical axis direction, It is possible to reduce the size of the shake correction unit.

  As in the second embodiment, when the L-shaped magnet 72 is used, in the direction connecting the one end and the other end of the L-shaped magnet 72, between the one end and the other end of the L-shaped magnet 72. The second group lens 95 can be inserted into the formed space. Therefore, also in the third embodiment, by using the L-shaped magnet 72, the lens holding frame 96 can be saved in the Y direction.

  In the third embodiment, as in the second embodiment, the lens holding frame 96A is driven in the X1 direction by energizing the coil 93a, and is driven in the Y1 direction by energizing the coil 93b. At this time, as in the first and second embodiments, a slight force (reaction force) is generated in the direction opposite to the direction to be driven by the magnetic field of the adjacent magnetic pole. However, in the third embodiment, since the length of the coil 93a in the Y1 direction and the length of the coil 93b in the X1 direction can be increased, the ratio of the reaction force to the entire driving force is small and can be ignored. it can. At this time, the influence of the reaction force can be further suppressed by increasing the length of the coil 93a in the Y1 direction and the length of the coil 93b in the X1 direction within the space allowed.

  As is clear from the description in the first to third embodiments, the magnet for driving the lens holding frame 96 only needs to be magnetized to two or more poles, and thereby, the two coils 93a and 93b are used. It can be driven. However, even if it is magnetized to 5 poles or more, a magnetization boundary portion that is not used is generated, so it is desirable to set it to 4 poles or less.

<Fourth embodiment>
In 4th Embodiment, it replaces with the L-shaped magnet 72 used in 3rd Embodiment, and the L-shaped magnet 72L which provided the notch part in the corner | angular part 72g (refer FIG. 8) of the L-shaped magnet 72 is used. .

  FIG. 10 is a rear view and a side view showing the configuration of the main components of the image blur correction unit according to the fourth embodiment of the present invention provided in the second group barrel 9. More specifically, FIG. 10A is a front view showing the positional relationship among the L-shaped magnet 72L, the lens holding frame 96B, the coils 93a and 93b, the position detection elements 94a and 94b, and the ball 98 as viewed from the imaging surface side. FIG. 10 (b) is a side view corresponding to FIG. 10 (a). FIG. 11 is a front view for explaining the configuration (magnetized state) of the L-shaped magnet 72L, and the Z direction in the figure is the direction toward the subject. In the fourth embodiment, the lens holding frame 96 </ b> A used in the second and third embodiments is partly changed in shape, and therefore the description of the lens holding frame is changed to “96B”.

  The L-shaped magnet 72L has a structure in which a notch 72f is provided by removing the corner portion 72g (a part of the outer region of the bent portion) of the L-shaped magnet 72 described in the third embodiment. . Since the magnetized state of the L-shaped magnet 72L conforms to the magnetized state of the L-shaped magnet 72 described in the third embodiment, detailed description thereof is omitted.

  The corner portion 72g of the L-shaped magnet 72 described in the third embodiment generates a force (reaction force) in a direction opposite to the direction to be driven although the influence force is small in driving the lens holding frame 96A. Therefore, it is desirable to be removed. In the L-shaped magnet 72L, the region of the notch 72f is provided up to the L-shaped center line, that is, the S pole 72a and the N pole 72c are divided, but the N pole 72b and the S pole 72d are not divided. Yes. Thus, the lens holding frame 96B can be driven in the X1A direction by energizing the coil 93a, and can be driven in the Y1 direction by energizing the coil 93b. In this case, the notch 72f is provided. The reaction force can be reduced.

  FIG. 12 is a rear view comparing the lens holding frame 96A used in the second and third embodiments with the lens holding frame 96B used in the fourth embodiment. As shown in the left diagram of FIG. 12, since the L-shaped magnet 72L is provided with a notch 72f, the ball receiving portion 96g or the ball 98 can be disposed in the space. Therefore, the lens holding frame 96B can be made smaller in the Y direction by the distance D1 shown in the drawing than the lens holding frame 96A that holds the L-shaped magnet 72 without the notch 72f.

  FIG. 13A is a front view for explaining the arrangement of the position detection elements 94a and 94b in the fourth embodiment. In FIG. 13A, illustration of the coil 93b is omitted. FIG. 13B is a side view corresponding to FIG.

  In the third embodiment described above, the position detection element 94a is disposed at a position facing the air core portion of the coil 93a, and the position detection element 94b is disposed at a position facing the air core portion of the coil 93b. However, the present invention is not limited to this, and the position detection element 94a can be disposed at a position facing the coil 93b and the position detection element 94b can be disposed at a position facing the coil 93a with the L-shaped magnet 72 interposed therebetween. .

  In other words, in the fourth embodiment, the position detecting element 94a is arranged on the same side as the coil 93a on the magnetic pole boundary portion not included in the coil 93a, and the position detecting element 94b is positioned on the same side as the coil 93b and not included in the coil 93b. It is arranged at the boundary. In such an arrangement, driving in the X1A direction by the coil 93a is detected by the position detection element 94b, and driving in the B direction by the coil 93b is detected by the position detection element 94a.

<Other embodiments>
Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. Furthermore, each embodiment mentioned above shows only one embodiment of this invention, and it is also possible to combine each embodiment suitably. For example, the lens holding frame 96 may be supported by an orthogonal shaft instead of being supported by the ball 98.

  The L-shaped magnets 70L, 72, and 72L may be configured by combining two magnets that are symmetric about the Y axis. In that case, for example, the two magnets may be fixed to the lens holding frame 96B by bonding or insert molding, and this makes it possible to manufacture at a lower cost than an L-shaped magnet having an integral structure. In addition, even if the L-shaped magnets 70L, 72, and 72L are configured using two magnets, they are functionally equivalent to one magnet, so that the vibration-proof performance is not deteriorated.

DESCRIPTION OF SYMBOLS 1 Imaging device 1A Camera main-body part 2 Lens barrel 9 2 group barrel 70 Magnet 70L, 72, 72L L-shaped magnet 90 Base member 91 Anti-vibration FPC
93a, 93b Coils 94a, 94b Position detecting element 95 2 group lens 96 Lens holding frame 98 Ball

Claims (16)

A lens barrel having a lens,
A lens holding frame for holding the lens;
One magnet provided on the lens holding frame and having a two-layer structure in the optical axis direction of the lens barrel;
Two coils arranged so as to sandwich the magnet in the optical axis direction,
The magnet is magnetized to two or more poles when viewed from the optical axis direction,
Each of the two coils is disposed so as to face different magnetic pole boundary portions orthogonal to each other and partially overlap when viewed from the optical axis direction. Lens barrel to be used. Each of the two coils has a long side portion and a short side portion,
The lens barrel according to claim 1, wherein the long side portions of the two coils are orthogonal to each other when viewed from the optical axis direction. The magnet is square and is magnetized to a total of 4 poles in 2 rows and 2 columns,
3. The lens according to claim 1, wherein the two coils share at least one of the four magnetic poles on the subject side and the imaging surface side in the optical axis direction. A lens barrel.   A position detection element for detecting the position of the lens holding frame in a plane perpendicular to the optical axis direction is arranged at a magnetic pole boundary portion not included in the coil among the magnetic pole boundary portions of the magnet. The lens barrel according to claim 3, wherein A base member disposed on the imaging surface side in the optical axis direction with respect to the lens holding frame;
Three balls held between the lens holding frame and the base member in the optical axis direction;
The at least one of the three balls is disposed at a position overlapping with one of the two coils when viewed from the optical axis direction. Lens barrel. The magnet has an L-shape and is magnetized into three poles so that three magnetic poles having a substantially square equivalent shape are formed from one end to the other,
3. The lens mirror according to claim 1, wherein the two coils share one central pole among the three magnetic poles on the subject side and the imaging surface side in the optical axis direction. Tube.   A position detection element for detecting the position of the lens holding frame in a plane orthogonal to the optical axis direction is arranged at a position corresponding to each air core part of the two coils of the magnetic pole boundary part of the magnet. The lens barrel according to claim 6.   In the lens holding frame, a part of the lens is inserted into a space formed between the one end and the other end in a direction connecting the magnetic poles of the one end and the other end of the magnet. The lens barrel according to claim 6 or 7, characterized in that: The magnet has an L-shape and is magnetized to an L-shaped two poles along the L-shape,
3. The lens barrel according to claim 1, wherein each of the two coils shares a part of two poles of the magnet on the subject side and the imaging surface side in the optical axis direction.   The lens barrel according to claim 9, wherein a part of the lens is inserted into a space formed between the one end and the other end of the magnet in the lens holding frame.   11. The lens barrel according to claim 9, wherein the magnet has a notch portion from which a part of an outer region of the bent portion of the magnet is removed. A base member disposed on the imaging surface side in the optical axis direction with respect to the lens holding frame;
Three balls held between the lens holding frame and the base member in the optical axis direction;
The lens barrel according to claim 11, wherein at least one of the three balls is inserted and disposed in the notch when viewed from the optical axis direction.   A position detection element for detecting the position of the lens holding frame in a plane orthogonal to the optical axis direction is disposed at a position corresponding to each air core portion of the two coils at the magnetic pole boundary of the magnet. The lens barrel according to any one of claims 9 to 12, wherein:   Magnetization in which a position detecting element for detecting the position of the lens holding frame in a plane orthogonal to the optical axis direction is not included in the coil arranged on the subject side of the two coils on the subject side of the magnet. 10. The boundary portion and the magnetized boundary portion that is not included in the coil disposed on the imaging surface side of the two coils on the imaging surface side of the magnet, respectively. The lens barrel according to any one of 12 above. An image stabilization lens,
A lens holding frame for holding the image blur correction lens;
One magnet provided on the lens holding frame and having a two-layer structure in the optical axis direction of the image blur correction lens;
Two coils arranged to sandwich the magnet in the optical axis direction;
A control circuit that supplies a drive signal to the two coils and moves the lens holding frame in a plane orthogonal to the optical axis direction;
The magnet is magnetized to two or more poles when viewed from the optical axis direction,
Each of the two coils is disposed so as to face different magnetic pole boundary portions orthogonal to each other and partially overlap when viewed from the optical axis direction. Image blur correction device. The lens barrel according to any one of claims 1 to 14,
An imaging device comprising: an imaging device that converts an optical image formed by light passing through the lens barrel into image data.