JP2017111183A - Hand tremor correction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand tremor correction device that can highly accurately move a movable member to a prescribed position, and can be downsized and light-weighted.SOLUTION: A hand tremor correction device includes: a first stationary part 2; a second stationary part 5 that is assembled to the first stationary part 2; a movable unit 3 that is arranged between the first stationary part 2 and the second stationary part 5 along an optical axis direction, is rotatably supported in an in-plane orthogonal to n optical axis, and holds a correction lens; and a plurality of voice coil motors 6a, 6b and 6c that have three drive magnets 61a, 61b and 61c with a Halbach array to be installed in the first stationary part 2 (or may be the movable unit 3), and drive coils 62a, 62b and 62c. The first stationary part 2 includes a first stationary frame 20 that abuts against a part of an outer peripheral side of the drive magnets 61a, 61b and 61c when viewing from the optical axis direction, and has wall parts 25a, 25b and 25c thinner than the drive magnet. The first stationary frame 20 includes adhesive accumulations 26a, 26b and 26c on an upper part of each wall part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a camera shake correction apparatus including a voice coil motor that moves a movable portion relative to a fixed portion and a position detection member that includes a magnetic field detection element.

  In precision instruments such as digital cameras, such as digital cameras, for example, optical camera shake correction devices are attached to camera bodies and interchangeable lenses in order to take high-quality pictures as the taking lens becomes longer in focus or zoomed in at a higher magnification. It has become common to install. In an optical camera shake correction device, a correction lens or an image sensor is moved in a two-dimensional direction by a voice coil motor (hereinafter referred to as “VCM”) on a plane perpendicular to the optical axis, and a position detection device is mounted on the servo. It is common to control.

  For example, in Patent Document 1, a ball that can roll is sandwiched between a shift frame that holds a shake correction lens and a shift base, and the shift frame is pitched in a plane orthogonal to the optical axis by a moving coil type voice coil motor. And a magnet for detection fixed to the shift frame while urging the shift frame toward the base side by a magnetic attraction acting between the magnet and the yoke constituting the voice coil motor. And an image blur correction device including position detection means including a Hall element fixed to the shift base.

  However, since the image blur correction apparatus described in Patent Document 1 is arranged so that the coil of the voice coil motor and the magnet for detection overlap when viewed from the optical axis direction, the position detection is performed under the influence of the magnetic field of the coil. There is a problem that accuracy decreases. Also, the position detection magnet and the drive magnet are arranged so as to overlap in the optical axis direction, and a magnetic attraction force always acts between the movable position detection magnet and the fixed-side drive magnet. The force is a force that tries to hold the position of the movable part at the center position of the optical axis, and there is a problem that the movement of the movable part is hindered during the original control operation for correcting the image blur. Furthermore, since the attractive force between the magnets is very strong, when adjusting the attractive force of the movable part to the shift base, the distance between the position detection magnet and the drive magnet in the optical axis direction must be increased, and as a result There may be a problem that the size in the thickness direction becomes large and the size cannot be reduced.

  In recent camera shake correction apparatuses, it is necessary to improve the correction effect (the number of steps of the shutter speed), use a large-diameter lens, and reduce the size. However, even if VCM is simply used, it is difficult to improve thrust and it cannot be downsized. Therefore, it is conceivable to use a VCM having a magnetic circuit structure having a Halbach array as lens driving means. A driving means having a Halbach array is described in Patent Document 2, for example.

  In Patent Document 2, a magnet fixing member such as a back yoke or a hub is not required, and the moving element is magnetized in a direction perpendicular to the stator in order to reduce the weight of the moving magnet type linear motor. A cuboid main magnetic pole permanent magnet and a rectangular parallelepiped auxiliary magnetic pole permanent magnet which is magnetized in the moving direction of the mover and circulates the magnetic flux are arranged in an odd number of at least three by a Hullback arrangement alternately arranged along the moving direction. A flat plate-shaped multipole field magnetic pole and a nonmagnetic holder that holds the side surface and the end surface in the moving direction of the flat plate-shaped multipole field magnetic pole. Are formed with a plurality of through-holes penetrating between the end faces in the moving direction, and the non-magnetic holder is formed with respective holes facing the plurality of through-holes, penetrating the through-holes of the multipole field magnetic poles. The end of the fastening rod protruding from the end face in the moving direction is not It is described that is fitted into the hole of sexual holder.

Japanese Patent No. 4006178 Japanese Patent No. 5300325

  However, if a Halbach array type magnetic circuit is to be constructed, there is a problem that the permanent magnets are lifted from the magnet fixing portion due to the same-polarity repulsive action because the permanent magnets having different magnetization directions are combined. Large linear motors, such as semiconductor manufacturing equipment, can assemble magnetic circuits using jigs, etc., so that they can prevent the magnets from floating, but small precision equipment such as image stabilization devices can prevent the magnets from floating. Will be difficult.

  Accordingly, an object of the present invention is to provide a camera shake correction device that can improve thrust and linearly move a movable part to a predetermined position with high accuracy, and can be reduced in size and weight.

The camera shake correction device of the present invention is
A fixed portion, a movable portion that is disposed to face the fixed portion along the optical axis direction and is rotatably supported in a plane orthogonal to the optical axis, and the fixed portion or the fixed portion or A plurality of voice coil motors having three drive magnets and a drive coil having a Halbach array installed in the movable part;
The fixed part or the movable part is provided in contact with a part of the outer peripheral side of the driving magnet when viewed from the optical axis direction, has a wall part thinner than the driving magnet, and has an adhesive on the upper part of the wall part. Having a reservoir,
It is characterized by this.

  In the present invention, it is preferable that at least a part of the adhesive reservoir is filled with an acrylic adhesive (more preferably an anaerobic adhesive).

  In the present invention, the fixed part and the movable part may be provided with members constituting a plurality of position detection parts, and the position detection part may have a detection magnet and a magnetic field detection element opposed thereto.

  In the present invention, the fixed portion includes a first fixed frame in which the driving magnet and the magnetic field detecting element are installed via a back yoke, and a second portion in which the movable portion is disposed between the fixed frame. A movable frame may be included, and the movable part may include the driving coil and the detection magnet.

  In the present invention, it is preferable that the position detecting magnet and the magnetic field detecting element are arranged at equiangular intervals along the circumferential direction when viewed from the axial direction.

  In this invention, it is preferable that the said spherical body is installed in the position which does not overlap with the said magnet for a drive seeing from an axial direction.

  In the present invention, it is possible to provide an opposing yoke fixed to the second fixing portion and into which a magnetic flux generated from the driving magnet flows and a suction yoke into which a magnetic flux generated from the detection magnet flows.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to move a movable member to a predetermined position at high speed, the camera-shake correction apparatus which can be reduced in size and weight can be obtained.

1 is an exploded perspective view of a camera shake correction apparatus according to an embodiment of the present invention. Ru It is a disassembled perspective view which shows the 1st fixing | fixed part in the camera-shake correction apparatus shown in FIG. It is a disassembled perspective view which shows the movable part in the camera-shake correction apparatus shown in FIG. It is a disassembled perspective view which shows the 2nd fixing | fixed part in the camera-shake correction apparatus shown in FIG. It is a schematic plan view for showing the positional relationship of the main members of the camera shake correction apparatus shown in FIG. It is sectional drawing (equivalent to the sectional view on the AA line of FIG. 2) of the camera-shake correction apparatus shown in FIG. FIG. 7 is an enlarged view of FIG. 6. It is sectional drawing of the camera-shake correction apparatus concerning a comparative example (a part of FIG. 6 is changed).

  The details of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>

  As shown in FIG. 1, the camera shake correction apparatus 1 includes a first fixing unit 2, a fixing unit 10 including a second fixing unit 5 fixed thereto, a first fixing unit 2, and a second fixing unit. An annular movable part 3 interposed between the part 5 and a plurality of (for example, three) spherical bodies (for example, steel balls) that slidably support the movable part 3 in a plane orthogonal to the central axis. 4a, 4b, 4c. The camera shake correction apparatus 1 is configured to drive a movable unit 3 having an optical element (for example, a correction lens) (not shown) in a plane perpendicular to a central axis (Z axis, in this example, an optical axis). Three movable coil type voice coil motors (hereinafter referred to as “VCM”) 6a, 6b, 6c having 61a, 61b, 61c and driving coils (air-core coils) 62a, 62b, 62c are provided. The driving coils 62a, 62b, and 62c are connected to a control circuit (not shown) through a flexible printed circuit board (hereinafter referred to as “FPC”) 9 (see FIG. 3). The VCM may be a movable magnet type or two.

  In order to detect the movement amount of the movable part 3, the camera shake correction apparatus 1 includes position detection parts 8a, 8b, 8c having magnetic field detection elements 80a, 80b, 80c and detection magnets 81a, 81b, 81c (see FIG. 3). ). The magnetic field detection elements 80a, 80b, and 80c are connected to a control circuit (not shown) through the FPC 7. The detection magnet can be omitted (the drive magnet may also be used).

  As shown in FIG. 5, in the above-described camera shake correction device 1, the VCMs 6a, 6b, and 6c are arranged at equiangular intervals (120 °) along the circumferential direction when viewed from the axial direction. The position detectors 8a, 8b, and 8c are located in the middle of the respective VCMs along the circumferential direction and are arranged at equal angular intervals (120 °). In this example, the spherical bodies 4a, 4b, and 4c are arranged at a position (between the VCM and the position detection unit) that does not overlap with the driving magnet when viewed from the axial direction.

  Details of each part of the camera shake correction apparatus 1 will be described including FIGS.

  As shown in FIG. 2 (see also FIG. 5), the first fixing portion 2 includes an annular fixing frame 20 including a support plate portion 21 and a flange portion 22 for supporting the second fixing portion 5. Have. The support plate portion 21 is formed at an equal angle interval (120 °) along the circumferential direction, and a depth into which a part of the drive magnet holding portions 23a, 23b, 23c and the spherical bodies 4a, 4b, 4c enter. It has the annular part 24a, 24b, 24c which has thickness. Back yokes 63a, 63b, 63c and driving magnets 61a, 61b, 61c made of a ferromagnetic material (for example, a steel material) are installed in the driving magnet holding portions 23a, 23b, 23c. The drive magnet can be formed of a known permanent magnet, but is preferably formed of a rare earth sintered magnet (for example, a rare earth / iron / boron magnet) in order to obtain high thrust with low power consumption. The FPC 7 includes receiving portions 70a, 70b, and 70c that extend radially from the annular portion. The magnetic field detection elements 80a, 80b, and 80c are installed on the support plate 21 in a state of being mounted on the receiving portions 70a, 70b, and 70c.

  In the present invention, as shown in FIG. 5 and FIG. 6, each magnet is composed of a pair of permanent magnets magnetized in the thickness direction, and a permanent magnet having a magnetization direction different from (for example, orthogonal to) these permanent magnets. Configure the magnetic circuit of the array. That is, a pair of permanent magnets have magnetic poles with different polarities facing the surface of the drive magnet, and other permanent magnets with different magnetization directions are adjacent to the magnetic poles of the permanent magnets that have the same polarity. To be arranged. With this Halbach arrangement, magnetic flux concentrates on each magnetic pole on the surface of the driving magnet (on the side facing the driving coil), so that the magnetic flux density of the magnetic gap can be improved, and thus the thrust of the VCM can be improved.

  Further, in the present invention, each permanent magnet is fixed to the fixed frame 20 using a specific adhesive and with a specific structure. In the Halbach arrangement of FIG. 7, the N pole of the permanent magnet 611b and the N pole of the permanent magnet 613b (the S pole of the permanent magnet 613b and the S pole of the permanent magnet 612b) repel each other, and it is necessary to suppress this repulsive force. It becomes. Therefore, the adhesive strength can be improved by using an acrylic adhesive which is preferably anaerobic (or may be an ultraviolet curable type). As shown in FIG. 7, when each drive magnet is constructed, the wall portion 25b is brought into contact with the outside of the permanent magnets 611b and 612b magnetized in the thickness direction, and the thickness (t2) of the wall portion 25b is set to the permanent magnet. In addition, the adhesive reservoir 26b is provided on the wall portion and at least one portion thereof is filled with the adhesive, and between each permanent magnet and the back yoke 63b. Also, an adhesive is interposed. The thickness t3 of the adhesive reservoir 26b may be less than or equal to half the thickness t1 of the drive magnet 61b. Thereby, it is possible to prevent the permanent magnets 611b and 612b from floating.

  As shown in FIG. 3 (viewed from the bottom of FIG. 1), the movable portion 3 includes a movable frame 30 including a cylindrical portion 31 that holds the outer periphery of an optical element (for example, a correction lens, not shown). The movable frame 30 includes a pair of coil holding portions 32a, 32b, 32c formed on the outer peripheral side of the flat plate portion, and annular portions 33a, 33b, 33c having a depth into which a part of the spherical body enters and a detection magnet 81a. 81b, 81c and detection magnet holding portions 34a, 34b, 34c for holding the back yokes 82a, 82b, 82c. Each of the detection magnets is magnetized in the thickness direction and arranged so that magnetic poles of different polarity are aligned along the radial direction. The coil holding portion, the annular portion, and the detection magnet holding portion are all equiangularly spaced (120 °) when viewed from the axial direction, and the detection magnets 81a, 81b, 81c and the annular portions 33a, 33b, 33c. Are arranged alternately along the circumferential direction. Each annular part 33a, 33b, 33c is formed in a size that allows the spherical bodies 4a, 4b, 4c to roll within a predetermined range. The coil holding portions 32a, 32b, and 32c are fitted with air core portions of driving coils 62a, 62b, and 62c, which are flat air-core coils, constituting the movers of the VCMs 6a, 6b, and 6c.

  As the detection magnet, a known permanent magnet can be used, but since it is installed on the movable part, in order to reduce the weight, permanent magnet powder (the surface may be coated with resin) and this You may use the rare earth bond magnet which couple | bonded the rare earth magnet powder with polymer materials, such as resin or rubber | gum. However, since the output voltage of the magnetic field detection element (for example, Hall element) decreases, it may be amplified electrically. The material of the detection magnet is preferably a rare earth bonded magnet in order to reduce the weight of the movable part. However, if the mass of the movable member is large, even a small rare earth sintered magnet can substantially reduce the weight of the movable part. There is no practical problem because it does not hinder it.

  As shown in FIG. 4, the second fixing portion 5 includes a ferromagnetic disk (secondary frame-like second fixing frame 50) and yokes 52 a, 52 b, 52 c formed therein. Opposite yokes 51a, 51b, 51c made of a steel material such as an SS material. The opposing yoke has a thickness in the range of, for example, 1 to 2 mm, and can have the same size as the suction yokes 27a, 27b, and 27c. Therefore, the manufacturing cost can be reduced.

  As shown in FIG. 6, the opposing yoke 51b (51a, 51c) is provided at a position where the magnetic flux generated from the driving magnet 61b (61a, 61c) flows. By narrowing the gap between the opposing yoke 51b (51a, 51c) and the driving magnet 61b (61a, 61c), the leakage magnetic flux is reduced and the permeance coefficient is improved, and the thrust of the VCM can be improved. Since the suction yoke 27a (27b, 27c) is provided at a position where the magnetic flux flowing out from the detection magnet 81a (81b, 81c) flows, the movable portion 3 is magnetically moved away from the fixed portion 2 along the axial direction. Is aspirated. The gap between the detection magnet 81a (81b, 81b) and the suction yoke 27a (27b, 27c) can be adjusted, for example, by changing the installation position of the detection magnet. The gap between the detection magnet 81a (81b, 81c) and the magnetic field detection element 80a (80b, 80c) can be adjusted, for example, by changing the installation position of the magnetic field detection element.

  Since the movable frame 30 has a plurality of spherical bodies interposed between the movable frame 30 and the first fixed frame when viewed from the optical axis direction, the movable frame 30 ensures a planar positional accuracy perpendicular to the optical axis. It becomes possible. The first fixed frame 20, the movable frame 30, and the second fixed frame 50 are formed of a non-magnetic material (for example, engineering plastic).

  As in the present embodiment, when the center of the magnetic field detection element is at a position reversed from the center of thrust, calculation of the current position is facilitated, and the movable member can be quickly moved to the target position. Further, since the magnetic field detection elements 80a, 80b, and 80c are located far from the driving coils 62a, 62b, and 62c, the magnetic field detection elements 80a, 80b, and 80c are not affected by the magnetic flux generated from the coils (without noise) and are highly accurate. Can be detected.

  In the above-described camera shake correction apparatus 1, the magnitude and direction of the thrust can be adjusted by changing the polarity and / or magnitude of the current supplied to each driving coil, so that the thrust generated in each VCM is synthesized. Thus, the movable part 3 can be driven in an arbitrary direction within a plane perpendicular to the central axis. This drive amount is fed back to the control circuit, and servo control for moving the movable member to the target position can be performed.

  When the movable member is driven by the VCM described above, position detection members 8a, 8b, and 8c for detecting the moving amount of the movable portion 3 are provided, and detection magnets 81a, 81b, and 81c installed on the movable portion 3 are provided. Since the generated magnetic field is detected by the magnetic field detection elements 80a, 80b, and 80c, feedback control can be performed based on the amount of movement of the movable portion 3. The first fixed frame 20 is provided with suction yokes 27a, 27b, and 27c, so that magnetic flux generated from the detection magnet flows and a magnetic attraction force is generated between the detection magnet and the suction yoke. Thus, the movable part 3 is attracted to the first fixed part 2 side. That is, in the present embodiment, the detection magnets 81a, 81b, 81c function as magnetic field generating means for attracting the movable part 3 to the first fixed part 2 side as well as magnetic field generating means for performing position detection. Have both.

  The above detection magnets (same for the drive magnets) are a pair of flat permanent magnets magnetized in the thickness direction (single-pole magnetized), but instead of a pair of flat permanent magnets It is possible to use a single flat permanent magnet that is magnetized in the thickness direction and has adjacent magnetic poles of different polarities.

  In the initial position where the movable part 3 is centered, the magnetic field detection elements 80a, 80b, 80c are respectively intermediate between the detection magnets 81a, 81b, 81c whose centers are fixed to the movable part 3 (positions where the magnetic poles are reversed: The magnetic flux density is almost zero). Therefore, on the surface of each magnetic field detection element 80a, 80b, 80c, the magnetic flux density from the one end to the other end of each detection magnet 81a, 81b, 81c has a predetermined length across the middle (zero cross point) of the detection magnets. Within a range, the magnetic flux density varies linearly. Since the magnetic field detection element outputs a voltage proportional to the magnetic flux density, if the size of the magnet part and the distance between the magnetic field detection element and the magnet part are set appropriately, it is proportional to the amount of movement of the detection magnet (change in magnetic force). Since the output voltage can be output to the control circuit and the linearity of the output voltage can be improved, highly accurate positioning can be performed.

  In the present embodiment, as described above, the suction yoke, the magnetic field detection element, and the detection magnet are arranged in this order along the central axis direction, and are symmetrical with respect to the magnetic field detection element across the central axis. In position, the back yoke, the driving magnet, the movable coil, and the opposing yoke are arranged in this order. As described above, the magnetic field detection element is not opposed to the movable coil and is disposed at a position away from the movable coil, so that the magnetic flux generated from the movable coil does not affect the magnetic field detection element. Further, since the attraction yoke is disposed at a position where the magnetic flux generated from the detection magnet flows, the movable portion 3 is magnetically attracted toward the yoke. By setting the magnetic attraction force to an appropriate value according to the mass of the movable part, the movable part 2 can be smoothly supported in a plane orthogonal to the central axis. The value of the magnetic attractive force is preferably about twice the mass of the movable member. For example, when the mass of the movable part is about 25-30 g, it is preferably in the range of 50-60 gf.

  The camera shake correction apparatus of the present invention is, for example, in the case where the mass of the movable member 5 is 20 to 30 g, so that the thrust mass ratio (maximum thrust / mass of the movable member) falls within the range of, for example, 3.0 to 4.0. Can be configured. However, the thrust mass ratio may be 4.0 or more.

  When the movable part is driven by VCM and a Hall element is used as the position detection element, the maximum moving distance of the movable member can be set within a range of ± (0.5 to 1.0) mm from the initial position, for example. it can. In this movement range, it is necessary that the difference between the actual movement amount and the movement amount corresponding to the output voltage of the magnetic field detection element (the error amount with respect to the theoretical line) is small (high linearity). When the element is used, the error amount with respect to the theoretical straight line can be within 0.04 mm.

  In the present embodiment, the positions of the opposing yokes 51a, 51b, 51c, the suction yokes 27a, 27b, 27c and the magnetic field detection elements 80a, 80b, 80c in the axial direction (Z-axis direction) can be adjusted independently. Therefore, it is possible to adjust the magnetic attraction force by the detection magnet and the linearity of the output of the magnetic field detection element to optimum values while obtaining a high thrust, irrespective of the thrust.

As described above, according to the present embodiment,
(1) Since the drive magnet is formed by three permanent magnets having the Halbach array, the thrust is improved and the permanent magnet is fixed to the fixed frame with a specific structure using a specific adhesive. The magnet can be firmly held on the fixed frame.

(2) Since the magnetic circuit is formed by arranging the driving magnet, the driving coil, and the opposing yoke along the axial direction, it is possible to use a fixed magnet having large magnetic characteristics without increasing power consumption. Therefore, the thrust mass ratio can be increased, and since the detection magnet is used separately from the drive magnet, the dimension of the detection magnet can be set giving priority to the straightness of the output voltage of the magnetic field detection element, In addition to being able to dispose the magnetic field detection element at a position where the magnetic flux generated from the driving coil does not reach, and eliminating the influence of the driving coil on the magnetic field detection element, the following effects are achieved. obtain.

(3) Since the two yokes are provided in the fixed portion at positions facing the drive magnet and the detection magnet, the thrust generated by the VCM for driving the movable member and the magnetism for attracting the movable member to the fixed side member Both the attractive force and the linearity of the output of the magnetic field detecting element can be adjusted independently (to an optimum value).

<Experimental example 1>
The surface magnetic flux density and the maximum thrust were compared for the magnetic circuit structure of the present invention shown in FIG. 6 and the conventional magnetic circuit structure shown in FIG. FIG. 8 is the same as FIG. 6 except that the three permanent magnets are changed from the Halbach arrangement to the normal two-pole arrangement (two permanent magnets magnetized in the thickness direction are arranged so that magnetic poles of different polarities are adjacent to each other). It is the same structure as. The experimental condition is that the distance between the driving coil and the driving magnet is set to 0.3 mm, a DC voltage of 5 V is applied to a coil having a wire diameter of 0.14 mm, 250 turns, and a resistance of 13.9 Ω. Rare earth sintered magnet having a width (w1) of 3.0 mm, a length (l1: refer to FIG. 2) of 16 mm, and a thickness (t1) of 3 mm (Nd—Fe—B system, (BH) max = 48 MGOe, Br = 1.35 ~ 1.41T) (the width is 9 mm in total), and in FIG. 8, the width (w2) is 4.5 mm, the length (same as FIG. 6) is 16 mm, and the thickness (t4) is 3 mm. Two rare earth sintered magnets (total width: 9 mm) were used. FIG. 8 shows a configuration other than that in which the three permanent magnets are changed from the Halbach arrangement to the normal two-pole arrangement (two permanent magnets magnetized in the thickness direction are arranged so that magnetic poles of different polarities are adjacent to each other). It is the same structure as.

  In the magnetic circuit of FIG. 8, the surface magnetic flux density is 0.48 T and the maximum thrust is 740 mN, whereas in the magnetic circuit of FIG. 6, the surface magnetic flux density is 0.64 T and the maximum thrust is 950 mN, which is a significant improvement. It was.

<Experimental example 2>
To assemble the magnetic circuit shown in FIG. 6 and FIG. 7, four types of commercially available adhesives [(1) acrylic instantaneous adhesive Loctite 4204, (2) room temperature moisture curable silicone adhesive Cemedine SX720B, (3) Adhesive strength using two-component self-curing epoxy adhesive ThreeBond E90-EL, (4) UV curable acrylic instant adhesive ThreeBond TB3177, (5) Anaerobic UV curable acrylic adhesive ThreeBond 1359G] Was evaluated.

(Example 1)
As a result of natural standing for 24 hours after applying each adhesive, peeling of permanent magnets occurred in the adhesives of (1) and (2) above, but the adhesives of (3), (4) and (5) above The permanent magnet did not peel off, and the change in the surface magnetic flux density of the permanent magnet before and after bonding could be kept within ± 5%.
(Example 2)
After applying the adhesives of (3), (4), and (5) above, it was left in a high-temperature and high-humidity environment of 70 ° C and 90% RH for 168 hours. In the adhesive (5), no permanent magnet peeling occurred, and the change in the surface magnetic flux density of the permanent magnet before and after bonding could be kept within ± 5%.
(Example 3)
After applying the adhesives of (3), (4), and (5) above, after leaving at −30 ° for 30 minutes and then leaving at 70 ° C. for 30 minutes, a total of 168 hours was left as a result. Permanent magnet peeling occurs in (4), permanent magnet peeling does not occur in the adhesive of (5), and the change in surface magnetic flux density of the permanent magnet before and after bonding can be kept within ± 5%. It was.
(Example 4)
As a result of conducting a vibration test (20-60 Hz, amplitude 1.0 mm, 20 min.) After 24 hours after the application of each adhesive of the above (4) and (5), both of the above (4) and (5 ) Did not peel off the permanent magnet (3 surfaces), and the change in surface magnetic flux density of the permanent magnet before and after bonding could be kept within ± 5%.

(Example 5)
As a result of performing a drop impact test (gravity acceleration 100G 6 surface, +200 G 6 surface) after 24 hours after applying each adhesive of the above (4) and (5), it is permanent with the above adhesive. Separation of the magnet (3 sides) did not occur, and the change in the surface magnetic flux density of the permanent magnet before and after bonding could be kept within ± 5%.
From all the above test results, it is understood that an anaerobic acrylic adhesive is preferably used in the present invention, and an ultraviolet curable adhesive may be used.

1: Camera shake correction device,
10: fixed part 2: first fixed part,
20: fixed frame, 21: support plate part, 22: flange part, 23a, 23b, 23c: driving magnet holding part, 24a, 24b, 24c: ring part, 25a, 25b, 25c: wall part, 26a, 26b , 26c: adhesion reservoir, 27a, 27b, 27c: suction yoke 3: movable part,
30: Movable frame, 31: Cylindrical part, 32a, 32b, 32c: Coil holding part, 33a, 33b, 33c: Ring part, 34a, 34b, 34c: Magnet holding part for detection,
4a, 4b, 4c: spherical bodies,
5: 2nd fixing | fixed part,
50: second fixed frame, 51a, 51b, 51c: opposing yoke, 52a, 52b, 52c: yoke holding portions 6a, 6b, 6c: voice coil motor,
61a, 61b, 61c: driving magnet, 62a, 62b, 62c: driving coil, 63a, 63b, 63c: back yoke,
611a, 611b, 611c: Driving magnet (for Halbach array)
7, 9: flexible printed circuit board,
8a, 8b, 8c: position detection unit,
80a, 80b, 80c: magnetic field detection element,
81a, 81b, 81c: detection magnet, 82a, 82b, 82c: detection magnet back yoke

Claims (3)

A fixed portion, a movable portion that is disposed along the optical axis direction and is supported rotatably in a plane orthogonal to the optical axis, and is installed in the fixed portion or the movable portion. A plurality of voice coil motors having three drive magnets having a Halbach array and a drive coil;
The fixed part or the movable part is provided in contact with a part of the outer peripheral side of the drive magnet when viewed from the optical axis direction, has a wall part thinner than the drive magnet, and has an adhesive reservoir on the upper part of the wall part. A camera shake correction device characterized by comprising:   The camera shake correction apparatus according to claim 1, wherein the adhesive reservoir is filled with an acrylic adhesive (more preferably an anaerobic adhesive).   A plurality of detection magnets installed in the middle of each of the voice coil motors as viewed from the optical axis direction and installed in the fixed part or the movable part, and a plurality of magnetic field detection elements facing the detection magnets The camera shake correction apparatus according to claim 1, further comprising a position detection unit.

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