Drive unit

Abstract

To provide a drive unit capable of holding a movable section in a predetermined position relative to a fixed body, and uniformizing force applied to a rolling element disposed between the movable section and the fixed body.SOLUTION: A drive unit 100 comprises: a movable section 2; a fixed body 4; a first magnetic drive mechanism 5 for generating magnetic force for moving the movable section 2 in the X-axis direction; a second magnetic drive mechanism 6 for generating magnetic force for moving the movable section 2 in the Y-axis direction; a magnetic attraction section 7 for holding the movable section 2 in a predetermined position relative to the fixed body 4 by magnetic attraction force operating between a first attraction magnet 71 and a magnetic body 72; and multiple rolling elements 8 sandwiched between the movable section 2 and the fixed body 4 by magnetic attraction force. The first attraction magnet 71 and the magnetic body 72 are disposed in positions that match the center of gravity G of the movable section 2 when viewed from the light axis direction when the movable body 2 is positioned in a predetermined position relative to the fixed body 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drive device. [Background technology]

[0002] A driving device that drives an optical element mounted on a camera or mobile terminal to correct shake is described in Patent Document 1. The driving device in Patent Document 1 includes a movable element having an imaging element as the optical element, a fixed element, a camera-side shake correction unit that drives the movable element relative to the fixed element on a plane perpendicular to the optical axis, and three rolling balls arranged between the movable element and the fixed element. The movable element includes a sheet metal element made of a magnetic material. The camera-side shake correction unit includes a coil arranged on the movable element and a magnet arranged on the fixed element. The sheet metal element is attracted to the magnet by magnetic attraction, thereby biasing the movable element toward the fixed element. This holds the rolling balls rotatably between the movable element and the fixed element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-101783 Summary of the Invention [Problem to be solved by the invention]

[0004] In the drive device of Patent Document 1, when viewed from the optical axis direction, the magnet is composed of a magnet extending in the X-axis direction on the outside of a first side extending in the X-axis direction of the imaging element, and a magnet extending in the Y-axis direction on the outside of a second side extending in the Y-axis direction of the imaging element. When viewed from the optical axis direction, the three rolling balls are arranged on the outside of the first side, the outside of the second side, and the outside of a third side extending in the X-axis direction that forms a pair with the first side. Therefore, the magnetic attractive force is strong on the outside of the first side and the outside of the second side.

[0005] In the drive device of Patent Document 1, the movable member is biased toward the fixed member by magnetic attraction, but the movable member is not held in a predetermined position relative to the fixed member. Therefore, when correcting shake of the image sensor, depending on the tilt state of the drive device, it is difficult for the drive device to stably correct the shake of the movable member. Furthermore, because the three rolling balls each receive different forces from the movable member and the fixed member due to magnetic attraction, it is difficult for the movable member to stably move in the X-axis and Y-axis directions relative to the fixed member.

[0006] In view of the above problems, an object of the present invention is to provide a drive device that can hold a movable part in a predetermined position relative to a fixed body and can uniformly apply force to a rolling element arranged between the movable part and the fixed body. [Means for solving the problem]

[0007] In order to solve the above problem, the driving device of the present invention includes a movable part having an optical member, a fixed body overlapping with the movable part in an optical axis direction along the optical member, a first magnetic driving mechanism that generates a magnetic force that moves the movable part in a first direction perpendicular to the optical axis, a second magnetic driving mechanism that generates a magnetic force that moves the movable part in a second direction perpendicular to the optical axis and the first direction, a first attracting magnet arranged on one side of the movable part and the fixed body, and a magnetic body arranged on the other side of the movable part and the fixed body, and a magnetic attraction part that holds the movable part at a predetermined position with respect to the fixed body by a magnetic attraction force acting between the first attracting magnet and the magnetic body, and a plurality of rolling bodies that are sandwiched between the movable part and the fixed body by the magnetic attraction force. , and the first attracting magnet and the magnetic body are arranged at a position that coincides with the center of gravity of the movable part when viewed from the optical axis direction when the movable part is positioned at the predetermined position relative to the fixed body. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of the drive device of this embodiment. [Figure 2]FIG. 2 is an exploded perspective view of the drive device of FIG. 1 as seen from one side. [Figure 3] 3 is an exploded perspective view of the drive device of FIG. 1 as seen from the other side. [Figure 4] FIG. 4 is a perspective view of the movable portion as seen from one side. [Figure 5] FIG. 5 is a perspective view of the movable portion as seen from the other side. [Figure 6] FIG. 6 is a cross-sectional view of the magnetic attraction portion. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a drive device to which the present invention is applied will be described with reference to the drawings.

[0010] FIG. 1 is a perspective view of a driving device 100 of this embodiment. FIG. 2 is an exploded perspective view of the driving device 100 of FIG. 1 as seen from one side. FIG. 3 is an exploded perspective view of the driving device 100 of FIG. 1 as seen from the other side. FIG. 4 is a perspective view of the movable part 2 as seen from one side. FIG. 5 is a perspective view of the movable part 2 as seen from the other side. FIG. 6 is a cross-sectional view of the magnetic attraction part 7.

[0011] The driving device 100 is mounted on an imaging device such as a camera, etc. The driving device 100 moves the optical member 3 along a plane perpendicular to the optical axis L of the optical member 3 to correct camera shake.

[0012] In the following description, three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis. The Z-axis is parallel to the optical axis L. In the Z-axis direction, the Z1 direction is one side of the optical axis along the optical axis, which is the subject side of the optical member 3, and the Z2 direction is the other side of the optical axis along the optical axis, which is the image side of the optical member 3.

[0013] 1 to 3, the driving device 100 includes a movable part 2 having an optical member 3, a fixed body 4 overlapping with the movable part 2 in the optical axis direction, a first magnetic driving mechanism 5 that generates a magnetic force that moves the movable part 2 in the X-axis direction (first direction), a second magnetic driving mechanism 6 that generates a magnetic force that moves the movable part in the Y-axis direction (second direction), a magnetic attraction part 7 that holds the movable part 2 at a predetermined position relative to the fixed body 4, and a plurality of rolling elements 8 sandwiched between the movable part 2 and the fixed body 4. In this embodiment, the rolling elements 8 are three balls 81.

[0014] 2, the optical member 3 includes an imaging element 31 and a substrate 32 on which the imaging element 31 is mounted. The imaging element 31 is a CCD sensor, a CMOS sensor, or the like. A first flexible wiring board 12 is electrically connected to the substrate 32. In this embodiment, the optical axis L of the optical member 3 coincides with the center of the imaging element 31. The optical member 3 may further include an optical system made up of lenses.

[0015] As shown in FIGS. 2 to 5, the movable part 2 includes a rectangular main body 21 that holds the optical member 3. The main body 21 is made of resin. The main body 21 includes three protrusions 26 that protrude in the Z2 direction. The protrusions 26 are cylindrical. A ball accommodating portion 27 that is recessed in the Z1 direction is provided at the tip of the protrusion 26. A ball 81 is accommodated in the ball accommodating portion 27. A metal plate 29 is disposed on the bottom surface of the ball accommodating portion 27. When the ball 81 is accommodated in the ball accommodating portion 27, the ball 81 comes into contact with the plate 29. A plurality of cooling fins 28 that protrude in the Z2 direction are formed on the Z2-direction surface of the main body 21. The cooling fins 28 cool the imaging element 31 and the substrate 32. Here, as shown in FIG. 1, the center of gravity G of the movable part 2 is located at a position that does not coincide with the optical axis L when viewed from the optical axis direction.

[0016] As shown in FIGS. 1 to 3, the fixed body 4 includes an upper fixed body 41 and a lower fixed body 42 that are arranged to sandwich the movable part 2 in the optical axis direction. The upper fixed body 41 and the lower fixed body 42 are each made of three metal plate members. The fixed body 4 includes three spacers 43 that determine the distance between the upper fixed body 41 and the lower fixed body 42 in the optical axis direction. The upper fixed body 41 is fixed to the spacers 43 with screws 15. The lower fixed body 42 is fixed to the spacers 43 with screws 16.

[0017] As shown in FIGS. 2 and 3 , the first magnetic drive mechanism 5 includes a first coil 51 disposed on the movable part 2 and a first drive magnet 52 disposed on the fixed body 4 and facing the first coil 51. The first coil 51 is electrically connected to the second flexible wiring board 13, inserted into a first coil holding hole 22 formed in the main body 21, and fixed to the main body 21 with an adhesive or the like. As shown in FIG. 4 , a first position detection element 9 that detects the position of the movable part 2 is disposed in the space at the center of the first coil 51. For example, a Hall element or the like is used as the first position detection element 9. The first position detection element 9 detects the position of the movable part 2 relative to the fixed body 4 using the magnetic circuit of the first drive magnet 52. Note that a magnetoresistive element may also be used as the first position detection element 9.

[0018] The first drive magnet 52 includes an upper first drive magnet 53 disposed on the upper fixed body 41 and facing the first coil 51, and a lower first drive magnet 54 disposed on the lower fixed body 42 and facing the first coil 51. The upper first drive magnet 53 and the lower first drive magnet 54 overlap in the optical axis direction. The upper first drive magnet 53 and the lower first drive magnet 54 include two magnets 531 and 541 (first magnets) that are the same size and disposed at a predetermined interval in the X-axis direction. Here, the upper fixed body 41 and the lower fixed body 42 each include a first spacer 46 disposed between the two magnets 531 and 541. In this embodiment, the first spacer 46 is made of resin. The first spacer 46 defines the interval between the two magnets 531 and 541.

[0019] As shown in FIGS. 2 and 3 , the second magnetic drive mechanism 6 includes a second coil 61 disposed on the movable part 2, a second drive magnet 62 disposed on the fixed body 4 and facing the second coil 61, a third coil 66 disposed on the movable part 2 and aligned with the second coil 61 in the X-axis direction, and a third drive magnet 67 disposed on the fixed body 4 and facing the third coil 66. The second coil 61 and the third coil 66 are electrically connected to a second flexible wiring board 13, inserted into a second coil holding hole 23 formed in the main body 21, and fixed to the main body 21 with an adhesive or the like. As shown in FIG. 4 , a second position detection element 10 that detects the position of the movable part 2 is disposed in a space at the center of the second coil 61. A third position detection element 11 that detects the position of the movable part 2 is disposed in a space at the center of the third coil 66. The second position detection element 10 and the third position detection element 11 may be, for example, a Hall element. The second position detection element 10 and the third position detection element 11 detect the position of the movable part 2 relative to the fixed body 4 by utilizing the magnetic circuits of the second drive magnet 62 and the third drive magnet 67. Note that the second position detection element 10 and the third position detection element 11 may be magnetoresistive elements.

[0020] The second drive magnet 62 includes an upper second drive magnet 63 disposed on the upper fixed body 41 and facing the second coil 61, and a lower second drive magnet 64 disposed on the lower fixed body 42 and facing the second coil 61. The upper second drive magnet 63 and the lower second drive magnet 64 overlap in the optical axis direction. The upper second drive magnet 63 and the lower second drive magnet 64 include two magnets 631 and 641 (second magnets) that are the same size and disposed at a predetermined interval in the Y-axis direction. Here, the upper fixed body 41 and the lower fixed body 42 each include a second spacer 47 disposed between the two magnets 631 and 641. In this embodiment, the second spacer 47 is made of resin. The second spacer 47 defines the interval between the two magnets 631 and 641.

[0021] The third drive magnet 67 includes an upper third drive magnet 68 disposed on the upper fixed body 41 and facing the third coil 66, and a lower third drive magnet 69 disposed on the lower fixed body 42 and facing the third coil 66. The upper third drive magnet 68 and the lower third drive magnet 69 overlap in the optical axis direction. The upper third drive magnet 68 and the lower third drive magnet 69 include two magnets 681, 691 of the same size and disposed at a predetermined distance in the Y-axis direction. Here, the upper fixed body 41 and the lower fixed body 42 each include a third spacer 48 disposed between the two magnets 681, 691. In this embodiment, the third spacer 48 is made of resin. The third spacer 48 defines the distance between the two magnets 681, 691. In this embodiment, the second spacer 47 and the third spacer 48 are integrally formed.

[0022] 2, 3, 5, and 6, the magnetic attraction unit 7 includes a first attraction magnet 71 fixed to the lower fixed body 42 of the fixed body 4, and a magnetic body 72 fixed to the movable part 2. The magnetic attraction unit 7 holds the movable part 2 at a predetermined position relative to the fixed body 4 by the magnetic attraction force acting between the first attraction magnet 71 and the magnetic body 72. Here, the predetermined position is the design origin position of the movable part 2 relative to the fixed body 4, and the driving device 100 performs image stabilization of the optical member 3 by moving the movable part 2 around the origin position.

[0023] The first attracting magnet 71 has a circular shape when viewed in the optical axis direction. The first attracting magnet 71 is inserted into a recess 44 provided on the Z1-direction surface of the lower fixed body 42 and fixed with an adhesive or the like. An opening 711 is formed in the center of the first attracting magnet 71, penetrating the first attracting magnet 71 in the optical axis direction.

[0024] The magnetic body 72 is a circular magnet. The magnetic body 72 is inserted into a recess 24 provided on the surface of the movable part 2 in the Z2 direction and fixed with an adhesive or the like. An opening 721 is formed in the center of the magnetic body 72, penetrating the magnetic body 72 in the optical axis direction. In this embodiment, the first attractive magnet 71 and the magnetic body 72 are magnets of the same shape. The magnetic body 72 may be a metal member.

[0025] As shown in FIG. 6 , when the movable part 2 is positioned at a predetermined position relative to the fixed body 4, the first attracting magnet 71 and the magnetic body 72 are positioned to coincide with the center of gravity G of the movable part 2 when viewed from the optical axis direction. That is, the center of gravity G of the movable part 2, the first attracting magnet 71, and the magnetic body 72 are aligned on the axis N. Here, the movable part 2 includes a rectangular regulating frame 25 that surrounds the first attracting magnet 71. As shown in FIG. 6 , when the movable part 2 is positioned at a predetermined position relative to the fixed body 4, the regulating frame 25 is spaced apart from the first attracting magnet. When the movable part 2 moves in the X-axis and Y-axis directions, the first attracting magnet 71 abuts against the regulating frame 25, thereby defining the range of movement of the movable part 2. When the first attracting magnet 71 abuts against the regulating frame 25, the first attracting magnet 71 overlaps with at least a portion of the magnetic body 72 in the optical axis direction.

[0026] The balls 81 are spherical bodies made of metal. The balls 81 are sandwiched between the movable part 2 and the fixed body 4 by magnetic attraction. The three balls 81 roll, causing the movable part 2 to move in the X-axis and Y-axis directions relative to the fixed body 4.

[0027] (Action and effect) The driving device 100 of this embodiment includes a magnetic attraction unit 7 that holds the movable part 2 at a predetermined position relative to the fixed body 4 by a magnetic attraction force acting between a first attraction magnet 71 and a magnetic body 72. When the movable part 2 is at a predetermined position relative to the fixed body 4, the first attraction magnet 71 and the magnetic body 72 are arranged at a position that coincides with the center of gravity G of the movable part 2 when viewed from the optical axis direction. In other words, the magnetic body 72 is arranged at a position that coincides with the center of gravity G of the movable part when viewed from the optical axis direction. As a result, a magnetic attraction force acts at the position of the center of gravity G of the movable part 2 when viewed from the optical axis direction, so the movable part 2 is held at a predetermined position relative to the fixed body 4 regardless of the inclination of the driving device 100. As a result, the drive device 100 can stably move the movable part 2. Furthermore, the first magnetic drive mechanism 5 and the second magnetic drive mechanism 6 can easily maintain a constant magnetic force that moves the movable part 2 in the X-axis and Y-axis directions compared to when the magnetic attractive force acts at a position other than the position of the center of gravity G of the movable part 2, thereby reducing the power consumed by the first magnetic drive mechanism 5 and the second magnetic drive mechanism 6. Furthermore, because the magnetic attractive force acts at the position of the center of gravity G of the movable part 2, the force applied to the multiple balls 81 can be made uniform. As a result, the movable part 2 can easily move stably in the X-axis and Y-axis directions relative to the fixed body 4.

[0028] The movable part 2 includes a regulating frame portion 25 that surrounds a first attracting magnet 71 arranged on the fixed body 4. When the movable part 2 moves in the X-axis direction and the Y-axis direction, the first attracting magnet 71 comes into contact with the regulating frame portion, thereby defining the range of movement of the movable part 2. As a result, the range of movement of the movable part 2 is defined by the first attracting magnet 71 coming into contact with the regulating frame portion 25, and therefore the configuration of the drive device 100 can be simplified compared to a configuration in which a member other than the first attracting magnet 71 comes into contact with the regulating frame portion 25.

[0029] The first attractive magnet 71 that contacts the regulating frame portion 25 is circular when viewed from the optical axis direction. The regulating frame portion 25 is rectangular when viewed from the optical axis direction. This allows the movable portion 2 to move in a wider range than when the regulating frame portion 25 is circular.

[0030] When the first attractive magnet 71 abuts against the regulating frame portion 25, the first attractive magnet 71 overlaps with at least a part of the magnetic body 72 in the optical axis direction. This allows a magnetic attractive force to always be exerted between the first attractive magnet and the magnetic body, regardless of the position of the movable part 2 within its movement range.

[0031] An opening 711 is formed in the center of the first attracting magnet 71, penetrating the first attracting magnet 71 in the optical axis direction. As a result, even if the first attracting magnet 71 is made larger and the range over which the magnetic attractive force acts is widened, the strength of the magnetic attractive force can be adjusted by forming the opening 711. As a result, the force applied to the ball 81 can be adjusted, and it is possible to prevent the movable part 2 from becoming difficult to move relative to the fixed body 4.

[0032] The fixed body 4 includes an upper fixed body 41 and a lower fixed body 42 arranged to sandwich the movable part 2 in the optical axis direction. The first magnetic drive mechanism 5 includes a first coil 51 arranged on the movable part 2, an upper first drive magnet 53 arranged on the upper fixed body 41 and facing the first coil 51, and a lower first drive magnet 54 arranged on the lower fixed body 42 and facing the first coil 51. The second magnetic drive mechanism 6 includes a second coil 61 arranged on the movable part 2, an upper second drive magnet 63 arranged on the upper fixed body 41 and facing the second coil 61, and a lower second drive magnet 64 arranged on the lower fixed body 42 and facing the second coil 61. This allows the magnetic forces generated by the first magnetic drive mechanism 5 and the second magnetic drive mechanism 6 to be increased without increasing the sizes of the first drive magnet 52 of the first magnetic drive mechanism 5 and the second drive magnet 62 of the second magnetic drive mechanism 6.

[0033] The driving device 100 includes a first position detection element 9 disposed in a space at the center of the first coil 51 to detect the position of the movable part 2, and a second position detection element 10 disposed in a space at the center of the second coil 61 to detect the position of the movable part 2. The upper first drive magnet 53 and the lower first drive magnet 54 each include two magnets 531, 541 of the same size and arranged at a predetermined interval in the X-axis direction. The upper second drive magnet 63 and the lower second drive magnet 64 each include two magnets 631, 641 of the same size and arranged at a predetermined interval in the Y-axis direction. As a result, a predetermined interval is formed between the two magnets 531, 541, making it easy for the first position detection element 9 to detect the magnetic boundary between the two first magnets. As a result, a predetermined interval is formed between the two magnets 631, 641, making it easy for the second position detection element 10 to detect the magnetic boundary between the two magnets 631, 641. As a result, the first position detection element 9 can easily detect the magnetic boundary between the two magnets 631, 641. The output element 9 and the second position detection element 10 can accurately detect the position of the movable part 2 relative to the fixed body 4.

[0034] The second magnetic drive mechanism 6 includes a third coil 66 arranged on the movable part 2 alongside the second coil 61 in the X-axis direction, an upper third drive magnet 68 arranged on the upper fixed body 41 and facing the third coil 66, and a lower third drive magnet 69 arranged on the lower fixed body 42 and facing the third coil 66. This allows the second magnetic drive mechanism 6 to rotate the movable part 2 in a plane formed by the X-axis direction and the Y-axis direction.

[0035] The upper fixed body 41 and the lower fixed body 42 each include a first spacer 46 disposed between the two magnets 531 and 541, and a second spacer 47 disposed between the two magnets 631 and 641. This makes it easy to maintain a constant distance between the two magnets 531 and 541 and between the two magnets 631 and 641.

[0036] The magnetic body 72 is a magnet. This makes it possible to strengthen the magnetic attraction force acting between the first attracting magnet 71 and the magnetic body 72 without increasing the size of the first attracting magnet 71.

[0037] (Variation) In the above embodiment, the first drive magnet 52 comprises an upper first drive magnet 53 and a lower first drive magnet 54, but the first drive magnet 52 may also be only one magnet arranged on the lower fixed body 42.

[0038] In the above embodiment, the second drive magnet 62 comprises an upper second drive magnet 63 and a lower second drive magnet 64, but the second drive magnet 62 may also be only one magnet arranged on the lower fixed body 42.

[0039] The first spacer 46 and the second spacer 47 may be formed integrally with the upper fixed body 41 and the lower fixed body 42, respectively. In this case, the upper fixed body 41 and the lower fixed body 42 may each be formed by metal press working. This makes it difficult for the upper fixed body 41 and the lower fixed body 42 to deform even if the upper first drive magnet 53 and the upper second drive magnet 63 arranged on the upper fixed body 41 and the lower first drive magnet 54 and the lower second drive magnet 64 arranged on the lower fixed body 42 are attracted to each other by magnetic force.

[0040] A restriction frame portion 25 may be provided on the fixed body 4, and the magnetic body 72 may come into contact with the restriction frame portion 25, thereby restricting the range of movement of the movable part 2.

[0041] In the above embodiment, the center of gravity G of the movable part 2 does not coincide with the optical axis L when viewed from the optical axis direction, but the center of gravity G of the movable part 2 may be positioned at a position that coincides with the optical axis L when viewed from the optical axis direction.

[0042] The present technology can be configured as follows.

[0043] (1) a movable part including an optical member; a fixed body overlapping the movable part in an optical axis direction along the optical member; a first magnetic driving mechanism that generates a magnetic force that moves the movable part in a first direction perpendicular to the optical axis; a second magnetic driving mechanism that generates a magnetic force that moves the movable part in a second direction perpendicular to the optical axis and the first direction; a first attracting magnet disposed on one of the movable portion and the fixed portion; a magnetic attraction unit including a magnetic body disposed on the other side of the fixed body, the magnetic attraction unit holding the movable part at a predetermined position relative to the fixed body by a magnetic attraction force acting between the first attraction magnet and the magnetic body; a plurality of rolling elements sandwiched between the movable element and the fixed element by the magnetic attraction force; Equipped with A driving device characterized in that the first attractive magnet and the magnetic body are arranged in a position that coincides with the center of gravity of the movable part when viewed from the optical axis direction when the movable part is positioned at the predetermined position relative to the fixed body.

[0044] As a result, when viewed from the optical axis direction, a magnetic attractive force acts at the center of gravity of the movable part, making it easier to hold the movable part at a predetermined position relative to the fixed body. As a result, the drive device can stably move the movable part. Furthermore, the first magnetic drive mechanism and the second magnetic drive mechanism can more easily maintain a constant magnetic force that moves the movable part in the first and second directions compared to when the magnetic attractive force acts at a position other than the center of gravity of the movable part, thereby reducing the power consumed by the first magnetic drive mechanism and the second magnetic drive mechanism. Furthermore, because the magnetic attractive force acts at the center of gravity of the movable part, the force applied to the multiple rolling elements can be made uniform. As a result, the movable part can more easily move stably in the first and second directions relative to the fixed body.

[0045] (2) one of the movable part and the fixed body includes a regulating frame part that surrounds the first attracting magnet and the magnetic body that are disposed on the other of the movable part and the fixed body; The drive device described in (1) is characterized in that when the movable part moves in the first direction and the second direction, one of the first attractive magnet and the magnetic body hits the regulating frame part, thereby restricting the range of movement of the movable part.

[0046] As a result, the range of movement of the movable part is determined by either the first attractive magnet or the magnetic body contacting the regulating frame part, thereby simplifying the configuration of the drive device compared to a configuration in which a member other than the first attractive magnet or the magnetic body contacts the regulating frame part.

[0047] (3) one of the first attracting magnet and the magnetic body that contacts the regulating frame portion has a circular shape when viewed from the optical axis direction, 3. The driving device according to claim 2, wherein the regulating frame portion has a rectangular shape when viewed from the optical axis direction.

[0048] As a result, one of the first attractive magnet and the magnetic body that contacts the regulating frame portion is circular, and the regulating frame portion is rectangular, so the range of movement of the movable part can be made wider compared to when the regulating frame portion is circular.

[0049] (4) A driving device described in any one of (1) to (3), characterized in that an opening is formed in the central portion of the first attracting magnet, penetrating the first attracting magnet in the optical axis direction.

[0050] As a result, even if the first attracting magnet is made larger and the range over which the magnetic attractive force acts is widened, the strength of the magnetic attractive force can be adjusted by forming the opening.

[0051] (5) the first magnetic drive mechanism includes a first coil disposed on one of the movable part and the fixed body, and a first drive magnet disposed on the other of the movable part and the fixed body and facing the first coil; The drive device described in any one of (1) to (4) is characterized in that the second magnetic drive mechanism includes a second coil arranged on one of the movable part and the fixed body, and a second drive magnet arranged on the other of the movable part and the fixed body and facing the second coil.

[0052] (6) the fixed body includes an upper fixed body and a lower fixed body arranged to sandwich the movable part in the optical axis direction, the first magnetic drive mechanism includes a first coil arranged in the movable part, an upper first drive magnet arranged in the upper fixed body and facing the first coil, and a lower first drive magnet arranged in the lower fixed body and facing the first coil; The drive device described in any one of (1) to (4) is characterized in that the second magnetic drive mechanism comprises a second coil arranged in the movable part, an upper second drive magnet arranged in the upper fixed body and facing the second coil, and a lower second drive magnet arranged in the lower fixed body and facing the second coil.

[0053] This makes it possible to increase the magnetic force generated by the first magnetic drive mechanism and the second magnetic drive mechanism without increasing the size of the drive magnets of the first magnetic drive mechanism and the second magnetic drive mechanism.

[0054] (7) a first position detection element disposed in a space at the center of the first coil and detecting a position of the movable part; and a second position detection element disposed in a space at the center of the second coil and detecting a position of the movable part, the upper first drive magnet and the lower first drive magnet each include two first magnets that are the same size and are arranged at a predetermined interval in the first direction; The drive device described in (4) is characterized in that the upper second drive magnet and the lower second drive magnet each comprise two second magnets of the same size and arranged at a predetermined interval in the second direction.

[0055] This creates a predetermined gap between the two first magnets, making it easier for the first position detection element to detect the magnetic boundary between the two first magnets. This creates a predetermined gap between the two second magnets, making it easier for the second position detection element to detect the magnetic boundary between the two second magnets. As a result, the first and second position detection elements can accurately detect the position of the movable part relative to the fixed body.

[0056] (8) The drive device described in (6) or (7) is characterized in that the second magnetic drive mechanism comprises a third coil arranged in the movable part in line with the second coil in the first direction, an upper third drive magnet arranged in the upper fixed body and facing the third coil, and a lower third drive magnet arranged in the lower fixed body and facing the third coil.

[0057] This allows the second magnetic drive mechanism to rotate the movable part in a plane formed by the first direction and the second direction.

[0058] (9) The driving device described in (7) is characterized in that the upper fixed body and the lower fixed body each include a first spacer arranged between the two first magnets and a second spacer arranged between the two second magnets.

[0059] This makes it easier to keep the distance between the two first magnets and the distance between the two second magnets constant. .

[0060] (10) The drive device according to (9), wherein the first spacer and the second spacer are formed integrally with the upper fixed body and the lower fixed body, respectively.

[0061] As a result, even if the upper first drive magnet and upper second drive magnet arranged on the upper fixed body and the lower first drive magnet and lower second drive magnet arranged on the lower fixed body are attracted to each other by magnetic force, the upper fixed body and the lower fixed body are less likely to deform.

[0062] (11) The driving device according to any one of (1) to (10), wherein the magnetic body is a magnet.

[0063] This makes it possible to strengthen the magnetic attraction force acting between the first attracting magnet and the magnetic body without increasing the size of the first attracting magnet. [Explanation of symbols]

[0064] 100...drive device, 2...movable part, 3...optical member, 4...fixed body, 5...first magnetic drive mechanism, 6...second magnetic drive mechanism, 7...magnetic attraction part, 8...rolling body, 9...first position detection element, 10...second position detection element, 11...third position detection element, 12...first flexible wiring board, 13...second flexible wiring board, 15·16...screw, 21...main body, 22...first coil holding hole, 23...second coil holding hole, 24...recess: holds magnetic member, 25...regulating frame part, 26...protrusion, 27...ball accommodating part, 28...cooling fin, 29...plate, 31...imaging element, 32...substrate, 41...upper fixed body, 42...lower fixed body, 43...spacer, 44...recess, 4 6...first spacer, 47...second spacer, 48...third spacer, 51...first coil, 52...first drive magnet, 53...upper first drive magnet, 54...lower first drive magnet, 61...second coil, 62...second drive magnet, 63...upper second drive magnet, 64...lower second drive magnet, 66...third coil, 67...third drive magnet, 68...upper third drive magnet, 69...lower third drive magnet, 71...first attractive magnet, 72...magnetic material, 81...ball, 531...magnet (first magnet), 541...magnet (first magnet), 631...magnet (second magnet), 641...magnet (second magnet), 681...magnet, 691...magnet, 711...opening, 721...opening, G...center of gravity, L...optical axis.

Claims

1. a movable part including an optical member; a fixed body overlapping the movable part in an optical axis direction along the optical member; a first magnetic driving mechanism that generates a magnetic force that moves the movable part in a first direction perpendicular to the optical axis; a second magnetic driving mechanism that generates a magnetic force that moves the movable part in a second direction perpendicular to the optical axis and the first direction; a magnetic attraction unit including a first attraction magnet disposed on one side of the movable unit and the fixed body, and a magnetic body disposed on the other side of the movable unit and the fixed body, the magnetic attraction unit holding the movable unit at a predetermined position relative to the fixed body by a magnetic attraction force acting between the first attraction magnet and the magnetic body; a plurality of rolling elements sandwiched between the movable element and the fixed element by the magnetic attraction force; Equipped with A driving device characterized in that the first attracting magnet and the magnetic body are positioned at a position that coincides with the center of gravity of the movable part when viewed from the optical axis direction when the movable part is positioned at the predetermined position relative to the fixed body.

2. one of the movable part and the fixed body includes a regulating frame part that surrounds one of the first attracting magnet and the magnetic body that is disposed in the other of the movable part and the fixed body, The drive device according to claim 1, characterized in that when the movable part moves in the first direction and the second direction, one of the first attractive magnet and the magnetic body hits the regulating frame part, thereby restricting the range of movement of the movable part.

3. one of the first attracting magnet and the magnetic body that contacts the regulating frame portion has a circular shape when viewed from the optical axis direction, The drive device according to claim 2 , wherein the regulating frame portion has a rectangular shape when viewed in the optical axis direction.

4. 4. The driving device according to claim 1, wherein an opening is formed in a central portion of the first attracting magnet, the opening passing through the first attracting magnet in the optical axis direction.

5. the first magnetic drive mechanism includes a first coil disposed on one of the movable part and the fixed body, and a first drive magnet disposed on the other of the movable part and the fixed body and facing the first coil; The drive device described in claim 1, characterized in that the second magnetic drive mechanism comprises a second coil arranged on one of the movable part and the fixed body, and a second drive magnet arranged on the other of the movable part and the fixed body and facing the second coil.

6. the fixed body includes an upper fixed body and a lower fixed body arranged to sandwich the movable part in the optical axis direction, the first magnetic drive mechanism includes a first coil disposed in the movable part, an upper first drive magnet disposed in the upper fixed body and facing the first coil, and a lower first drive magnet disposed in the lower fixed body and facing the first coil; The drive device described in claim 1, characterized in that the second magnetic drive mechanism comprises a second coil arranged in the movable part, an upper second drive magnet arranged in the upper fixed body and facing the second coil, and a lower second drive magnet arranged in the lower fixed body and facing the second coil.

7. a first position detection element disposed in a space at the center of the first coil for detecting the position of the movable part; a second position detection element disposed in a space at the center of the second coil and configured to detect a position of the movable part, the upper first drive magnet and the lower first drive magnet each include two first magnets that are the same size and are arranged at a predetermined interval in the first direction, 7. The driving device according to claim 6, wherein the upper second driving magnet and the lower second driving magnet each comprise two second magnets of the same size and arranged at a predetermined interval in the second direction.

8. The drive device described in claim 6 or 7, characterized in that the second magnetic drive mechanism comprises a third coil arranged in the movable part in line with the second coil in the first direction, an upper third drive magnet arranged in the upper fixed body and facing the third coil, and a lower third drive magnet arranged in the lower fixed body and facing the third coil.

9. The drive device according to claim 7, characterized in that the upper fixed body and the lower fixed body each include a first spacer arranged between the two first magnets and a second spacer arranged between the two second magnets.

10. The drive device according to claim 9 , wherein the first spacer and the second spacer are integrally formed with the upper fixed body and the lower fixed body, respectively.

11. The driving device according to claim 1 , wherein the magnetic body is a magnet.

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