WO2019049555A1

WO2019049555A1 - Lens drive device, camera module, and method for manufacturing lens drive device

Info

Publication number: WO2019049555A1
Application number: PCT/JP2018/028576
Authority: WO
Inventors: 英幸五明; 大友　勝彦; 和昭長谷川; 秀充佐藤
Original assignee: アルプスアルパイン株式会社
Priority date: 2017-09-07
Filing date: 2018-07-31
Publication date: 2019-03-14
Also published as: JP2021004905A

Abstract

A lens drive device comprises: a lens holder capable of holding a lens body equipped with a lens; a first coil provided around the lens holder and moving the lens holder along the optical axis direction of the lens; a plurality of magnets provided around the first coil at a distance from the first coil; a magnet holder provided around the first coil and holding the magnets; upper and lower springs for coupling the lens holder and the magnet holder; a second coil provided at a distance from the magnets along the optical axis direction of the lens and moving the lens holder in a direction intersecting with the optical axis of the lens; a support for supporting the second coil; and a suspension wire for connecting the support and the upper spring. Each of the plurality of magnets is provided in a plurality of magnet placement regions in the magnet holder. Gaps are provided between each magnet and the surface that forms the magnet placement regions in the optical axis direction and in a direction perpendicular to the optical axis direction.

Description

Lens drive device, camera module and method of manufacturing lens drive device

The present invention relates to a lens driving device, a camera module, and a method of manufacturing the lens driving device.

2. Description of the Related Art In recent years, small cameras have been mounted on many portable devices represented by mobile phones. A lens is mounted in such a small camera, and a lens driving device for driving a lens body (a lens barrel on which the lens is mounted) is incorporated for autofocusing. Such a lens drive device is required to have a function to drive a lens body with a small size and accuracy, and in order to satisfy this requirement, as a lens drive device, a lens holder (lens holding member) for holding the lens body is driven. It is known to provide a magnetic circuit for the lens holder around the lens holder. Specifically, there is one in which a coil for auto focusing is provided around the lens holder, and a permanent magnet is further provided on the outside. The magnetic field of the permanent magnet crosses the coil for autofocusing, and the lens body is moved in the direction of the optical axis according to Fleming's left hand law by supplying current to the coil for autofocusing provided around the lens holder. Drive in parallel to perform focusing.

Furthermore, recently, in order to improve the quality of an image captured by a small camera, a camera shake correction mechanism used in a general camera is also incorporated into the small camera. The camera shake correction mechanism includes various methods such as a method of moving a lens, a method of moving an automatic focusing drive, or a method of moving an imaging device (for example, a CCD: Charge Coupled Device). In the lens driving device incorporating the method of moving the lens in the camera shake correction mechanism, for example, a camera shake correction coil is provided below the lens holder so as to cross the magnetic field of the permanent magnet, and the current is supplied to the camera shake correction coil The lens holder is driven in a direction perpendicular to the optical axis by moving the lens, and shake is corrected.

JP, 2016-38505, A

By the way, although the permanent magnet is used in the lens drive device mentioned above, there is a variation in the size of the permanent magnet. As described above, if there is variation in the size of the permanent magnet, the distance from the permanent magnet to the coil for autofocus changes, and the strength of the magnetic field penetrating the coil for autofocus is different. Even when a current is applied, the driving force for driving the lens body varies. As described above, when the driving force for driving the lens body varies, it may not be possible to perform proper autofocus. Also, if the size of the permanent magnet varies, the distance from the permanent magnet to the coil for camera shake correction changes, and the strength of the magnetic field penetrating the coil for camera shake correction is different. Also in the driving force which drives a lens body, dispersion arises. As described above, when the driving force for driving the lens body varies, it may not be possible to perform proper shake correction.

Therefore, there is a need for a lens driving device that has stable driving force for autofocus and image stabilization even if the size of the permanent magnet varies.

According to one aspect of the present embodiment, a lens holder capable of holding a lens body provided with a lens, and a lens holder disposed on the outer peripheral side of the lens holder and operating the lens holder in the optical axis direction of the lens And a plurality of magnets spaced apart from the first coil on the outer peripheral side of the first coil, and a magnet holder installed on the outer peripheral side of the first coil and holding the magnet And an upper spring and a lower spring connecting the lens holder and the magnet holder, and the lens is spaced apart from the magnet in the optical axis direction of the lens, and the lens holder is in a direction intersecting the optical axis direction of the lens And a plurality of magnets, each of which includes a second coil to be operated, a support for supporting the second coil, and a suspension wire for connecting the support and the upper spring. It is installed in each of a plurality of magnet installation areas of the gnet holder, and a direction perpendicular to the optical axis direction and the light are provided between each of the magnets and a surface forming the magnet installation area. A gap is provided in the axial direction.

According to the disclosed lens driving device, even if there is variation in the size of the permanent magnet, the driving force for auto focusing and image stabilization can be stabilized.

The perspective view (1) of the lens drive device in this embodiment The perspective view (2) of the lens drive device in this embodiment Top view of the lens drive device according to the present embodiment An exploded perspective view (1) of the lens drive device according to the present embodiment An exploded perspective view (2) of the lens drive device according to the present embodiment Structure of permanent magnet (1) Structure of permanent magnet (2) Structure of permanent magnet (3) Structure of permanent magnet (4) Bottom view of magnet holder Illustration of magnet holder (1) Illustration of magnet holder (2) Explanatory drawing (1) of the relationship with the 1st coil in case there is variation in the size of a permanent magnet Explanatory drawing (2) of the relationship with the 1st coil in case there is variation in the size of a permanent magnet Explanatory drawing (3) of the relationship with the 1st coil in case there is variation in the size of a permanent magnet Explanatory drawing (1) of a relation with the 2nd coil in case there is variation in size of a permanent magnet Explanatory drawing (2) of a relationship with the 2nd coil in case there is variation in size of a permanent magnet Explanatory drawing (3) of a relation with the 2nd coil in case there is variation in size of a permanent magnet Explanatory drawing (1) of the lens drive device in this Embodiment Explanatory drawing (2) of the lens drive device in this Embodiment Explanatory drawing (3) of the lens drive device in this Embodiment Explanatory drawing (4) of the lens drive device in this Embodiment An exploded perspective view of a jig used for manufacturing the lens driving device according to the present embodiment Explanatory drawing (1) of the magnetic member used for manufacture of the lens drive device in this Embodiment Explanatory drawing (2) of the magnetic member used for manufacture of the lens drive device in this Embodiment Explanatory drawing (1) of the 1st jig used for manufacture of the lens drive device in this Embodiment An explanatory view (1) of a first jig used for manufacturing a lens drive device according to the present embodiment. Perspective view of magnet holder Process explanatory drawing (1) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (2) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (3) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (4) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (5) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (6) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (7) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing (8) of the manufacturing method of the lens drive device in this Embodiment Process explanatory drawing of the manufacturing method of the lens drive device in this Embodiment (9) Process explanatory drawing of the manufacturing method of the lens drive device in this Embodiment (10) Explanatory drawing (5) of the lens drive device in this Embodiment Explanatory drawing (6) of the lens drive device in this Embodiment Structure diagram of camera module in the present embodiment

A mode for carrying out will be described below. In addition, about the same member etc., the same code | symbol is attached | subjected and description is abbreviate | omitted.

[Lens drive device]
The lens driving device in the present embodiment will be described based on FIGS. 1 to 5. FIG. 1 is a perspective view seen from the upper side of the lens drive device in the present embodiment, FIG. 2 is a perspective view seen from the lower side of the lens drive device in the present embodiment, and FIG. It is a top view of the lens drive device in this Embodiment. FIG. 4 is an exploded perspective view seen from the upper side of the lens drive device in the present embodiment, and FIG. 5 is an exploded perspective view seen from the lower side of the lens drive device in the present embodiment. The direction shown by the broken line arrow A in FIGS. 1 and 2 is the optical axis direction of the lens (not shown), and this direction is the direction perpendicular to the paper surface in FIG.

As shown in FIGS. 1 to 3, the lens drive device according to the present embodiment is formed in a rectangular parallelepiped shape in appearance. As shown in FIGS. 4 and 5, the lens drive device according to the present embodiment includes a case 10, an upper flat spring 20, a magnet holder 30, a permanent magnet 40, a lens holder 50, a first coil 60, and a lower flat spring 70. , The second coil 80, the magnetic sensor 81, the support 90, and the like. The upper leaf spring 20 and the lower leaf spring 70 are formed of a metal material having a spring property.

In the lens drive device according to the present embodiment, the lens holder 50 is formed with an opening 51 at a central portion so that a lens body such as a lens barrel (not shown) can be installed. A coil 60 of 1 is provided. The first coil 60 is a coil for lens autofocusing.

The magnet holder 30 is formed in a substantially rectangular shape (substantially quadrilateral shape) in a plan view as viewed from the optical axis direction, and an opening 31 in which the lens holder 50 and the first coil 60 are inserted is provided in the central portion. In the four corners located around the opening 31, magnet installation areas 32 in which permanent magnets 40 are installed are provided. Therefore, around the first coil 60, the permanent magnets 40 are disposed to face the first coil 60 at a distance, respectively.

On the upper side (subject side) of the magnet holder 30 and the lens holder 50, two upper leaf springs 20 are provided to face each other. The outer portion 21 of the upper leaf spring 20 is fixed to upper surface portions 33 at the four corners of the magnet holder 30 with an adhesive or the like, and the inner portion 22 of the upper leaf spring 20 is fixed to the upper surface portion 52 of the lens holder 50 by caulking or the like. It is done. Thus, the upper leaf spring 20 is connected to the outer portion 21 of the upper leaf spring 20 connected to the upper surface portion 33 of the magnet holder 30 and the inner portion 22 of the upper leaf spring 20 connected to the upper surface portion 52 of the lens holder 50. The spring portion 23 acts as a spring. The upper surface portion 33 of the magnet holder 30 is provided at a position corresponding to the magnet installation area 32, that is, at a position opposite to the ceiling surface 32a of the magnet installation area 32 described later in the optical axis direction.

Further, on the lower side (the imaging side) of the magnet holder 30 and the lens holder 50, two lower side plate springs 70 are provided to face each other. The outer portions 71 of the lower leaf spring 70 are fixed to the bottom portions 34 of the four corners of the magnet holder 30 by caulking or the like, and the inner portions 72 of the lower leaf spring 70 are fixed to the bottom portion 53 of the lens holder 50 with an adhesive or the like. It is done. Accordingly, the lower leaf spring 70 is an outer portion 71 of the lower leaf spring 70 connected to the bottom surface portion 34 of the magnet holder 30 and an inner portion 72 of the lower leaf spring 70 connected to the bottom surface portion 53 of the lens holder 50. A spring portion 73 serves as a spring.

Therefore, when a force in the optical axis direction is applied to the lens holder 50, the upper plate spring 20 and the lower plate spring 70 connecting the lens holder 50 and the magnet holder 30 are deformed, and the lens holder 50 is It can be moved in the direction of the optical axis of the lens.

In addition, two coil substrates 85 are provided opposite to each other between the lower flat spring 70 and the support 90 under the magnet holder 30, and permanent between the coil substrate 85 and the support 90. Two magnetic sensors 81 for detecting the magnetic force of the magnet 40 are provided. The magnetic sensor 81 is mounted on the lower surface of the coil substrate 85. The coil substrate 85 is formed of a multilayer substrate, and one second coil 80 is formed on each side of one coil substrate 85. The second coil 80 is formed of a spiral conductive pattern (not shown) formed on the inner layer and the surface of the coil substrate 85 made of a multilayer substrate. The four second coils 80 are disposed to face the four permanent magnets 40 with a distance, respectively.

In the support body 90, a wiring pattern for transmitting current to the first coil 60 and the second coil 80 and for transmitting a signal detected by the magnetic sensor 81 is formed. The wiring pattern is three-dimensionally formed on the support 90 by printing or the like, and a part of the wiring pattern of the support 90 is electrically connected to the wiring pattern including the conductive pattern formed on the coil substrate 85. There is. The four corners of the support 90 having a rectangular shape in plan view and the connection portions 24 at the four corners of the upper flat spring 20 are connected by four suspension wires 91, respectively. The lens holder 30 and the lens holder 50 are movable in a direction (generally perpendicular direction) intersecting the optical axis direction. The suspension wire 91 and the upper leaf spring 20 are made of a conductive metal material, and each of the two upper leaf springs 20 is a wire (wire) forming the first coil 60. Both end portions are connected by soldering or the like, and the wiring pattern of the support 90 and the suspension wire 91 are connected by soldering or the like. Therefore, an electric current can be supplied to the first coil 60 from the wiring pattern of the support 90 through the suspension wire 91 and the upper flat spring 20. Further, the coil substrate 85 having the second coil 80 is installed and supported on the support 90, and a current can flow from the wiring pattern of the support 90 to the second coil 80.

Next, the permanent magnet 40 will be described in more detail. As shown in FIGS. 6A to 6D, the permanent magnet 40 is formed in a substantially hexagonal column shape. 6A is a top view of the permanent magnet 40 viewed from the optical axis direction, FIG. 6B is a front view viewed from the inside (the side of the first coil 60), and FIG. 6C is a back view viewed from the outside Fig. 6D is a side view.

The external shape of the permanent magnet 40 is formed substantially in parallel with the inner side surface 40 a on the opposite side of the inner side surface 40 a which is the side of the first coil 60 (the side facing the first coil 60) and the inner side surface 40 a An outer surface 40b, a side surface 40c formed substantially perpendicular to the inner surface 40a from both ends of the inner surface 40a, an inclined surface 40d formed to scrape a corner between the side surface 40c and the outer surface 40b, an upper surface 40e and The bottom surface 40f is formed. Therefore, the side surface of the hexagonal prism is formed by the inner side surface 40a, the outer side surface 40b, the two side surfaces 40c, and the two inclined surfaces 40d. The angle between the inner surface 40a, the outer surface 40b, the side surface 40c and the inclined surface 40d and the upper surface 40e and the bottom surface 40f is substantially perpendicular, and the angle between the outer surface 40b and the side surface 40c and the inclined surface 40d is approximately It is 45 degrees. Each surface may be formed by a flat surface, and the corner between each surface and the surface may be chamfered. The permanent magnet 40 is a surface where the top surface 40 e and the bottom surface 40 f are opposed in the optical axis direction. Also, each permanent magnet 40 is magnetized so that the inner side surface 40 a and the outer side surface 40 b side have different magnetic poles, and is magnetized so that the inner side surfaces 40 a of the four permanent magnets 40 have the same magnetic pole ing. For example, the inner side surface 40a of all the permanent magnets 40 is an N pole, and the outer surface 40b side is an S pole.

In the present embodiment, four permanent magnets 40 described above are provided, and each permanent magnet 40 is installed in a magnet installation area 32 provided at four corners of the magnet holder 30. Specifically, as shown in FIGS. 7, 8A and 8B, the magnet installation area 32 is formed in a shape corresponding to the external shape of the permanent magnet 40, and the ceiling surface 32a substantially perpendicular to the optical axis direction The rear wall surface 32b, the side surface 32c, and the inclined surface 32d are substantially parallel to the optical axis direction. Therefore, in the magnet installation area 32, the side (inner side) where the first coil 60 is arranged and the side (imaging side) where the second coil 80 is arranged are opened. Further, an inner side surface 37 having a substantially U shape is formed around the magnet installation area 32 on the inner side of the magnet holder 30 (the side facing the first coil 60). 7 is a bottom view (plan view seen from the imaging side) of the magnet holder 30, FIG. 8A is a perspective view of the magnet installation area 32 of the magnet holder 30, and FIG. 8B is a view of the magnet holder 30. It is a side view of magnet installation field 32 seen from the opening 31 side.

Next, the auto focus function and the shake correction function will be described. In the present embodiment, a magnetic field penetrating the first coil 60 is generated by the permanent magnet 40 installed in the magnet holder 30, and a current is caused to flow through the first coil 60, according to Fleming's left-hand rule. A force is generated to move the first coil 60 in the optical axis direction of the lens. The magnet holder 30 and the lens holder 50 are connected by an upper leaf spring 20 and a lower leaf spring 70. The first coil 60 is attached to the lens holder 50, and the lens is attached to the lens holder 50. Therefore, by supplying current to the first coil 60, the lens holder 50 can be moved in the optical axis direction with respect to the magnet holder 30, and auto focusing of the lens can be performed.

Similarly, a magnetic field penetrating the second coil 80 is generated by the permanent magnet 40 installed in the magnet holder 30, and the permanent magnet 40 and the second coil 80 are generated by supplying a current to the second coil 80. Force is generated between Since the coil substrate 85 having the second coil 80 is fixed on the support 90, the force acts in the moving direction of the permanent magnet 40. The four corners of the magnet holder 30 to which the permanent magnet 40 is attached are connected to the support 90 via the upper leaf spring 20 and the suspension wire 91 having elasticity. Therefore, by supplying current to the second coil 80, the permanent magnet 40, the magnet holder 30, and the lens holder 50 can be moved in a direction substantially perpendicular to the optical axis of the lens. In this way, camera shake correction can be performed. In the four second coils 80, two second coils 80 located at one diagonal are connected in series, and the remaining two second coils 80 located at the other diagonal are connected. Connected in series.

By the way, it is difficult to produce many permanent magnets 40 having exactly the same size, and variations in size occur. Therefore, when the permanent magnet 40 is installed in the magnet installation area 32 of the magnet holder 30 by aligning the outer surface 40b of the permanent magnet 40 on the back wall surface 32b of the magnet installation area 32, the inner surface 40a of the permanent magnet 40 and the A difference occurs in the distance between the first coil 60 and the second coil 60.

Specifically, as shown in FIG. 9A, when the permanent magnet 40 is formed in a desired shape, the distance between the inner side surface 40a of the permanent magnet 40 and the first coil 60 is La1. On the other hand, as shown in FIG. 9B, when the thickness between the inner surface 40a and the outer surface 40b of the permanent magnet 40 is large, the distance La2 between the inner surface 40a of the permanent magnet 40 and the first coil 60 is 9A is smaller than the interval La1 in the case shown in FIG. 9A. In this case, when the magnetic field penetrating the first coil 60 is intensified, and the same current as in the case shown in FIG. 9A is applied to the first coil 60, the force acting on the first coil 60 is greater than that shown in FIG. Also becomes stronger.

Further, as shown in FIG. 9C, when the thickness between the inner surface 40a and the outer surface 40b of the permanent magnet 40 is small, the distance La3 between the inner surface 40a of the permanent magnet 40 and the first coil 60 is as shown in FIG. It becomes wider than the interval La1 in the case shown in 9A. In this case, even if the magnetic field penetrating the first coil 60 becomes weak and the same current as in the case of FIG. 9A flows in the first coil 60, the force acting on the first coil 60 is as shown in FIG. 9A. It becomes weaker than.

As described above, when the force acting on the first coil 60 varies due to the variation in the size of the permanent magnet 40, it is not possible to perform proper autofocus.

Further, as shown in FIG. 10A, when the permanent magnet 40 is formed in a desired shape, the distance between the bottom surface 40f of the permanent magnet 40 and the second coil 80 provided on the coil substrate 85 is Lb1. is there. On the other hand, as shown in FIG. 10B, when the thickness between the top surface 40e and the bottom surface 40f of the permanent magnet 40 is large, the distance Lb2 between the bottom surface 40f of the permanent magnet 40 and the second coil 80 is as shown in FIG. It becomes narrower than the interval Lb1 in the case shown in FIG. In this case, when the magnetic field penetrating the second coil 80 is intensified, and the same current is applied to the second coil 80 as shown in FIG. 10A, the force acting on the permanent magnet 40 (the force acting on the second coil 80 The reaction force) is stronger than the case shown in FIG. 10A.

Further, as shown in FIG. 10C, when the thickness between the top surface 40e and the bottom surface 40f of the permanent magnet 40 is thin, the distance Lb3 between the bottom surface 40f of the permanent magnet 40 and the second coil 80 is as shown in FIG. It becomes wider than the case interval Lb1. In this case, even though the magnetic field penetrating the second coil 80 is weakened and the same current as in FIG. 10A is applied to the second coil 80, the force acting on the permanent magnet 40 is weaker than that shown in FIG. 10A. Become.

As described above, when the force acting on the second coil 80 reflects the variation of the size of the permanent magnet 40, the shake correction may not be properly performed if the variation occurs. In addition, since the magnet holder 30 is manufactured using a metal mold | die etc., compared with the permanent magnet 40, it can manufacture with high dimensional accuracy.

In the lens drive device according to the present embodiment, the magnet installation area 32 has a shape larger than the external dimension of the permanent magnet 40 so that a gap is formed between the magnet installation area 32 of the magnet holder 30 and the permanent magnet 40. It is formed. When the permanent magnet 40 is installed, the permanent magnet 40 is positioned so as to be a desired position, and then the gap between the magnet installation area 32 of the magnet holder 30 and the permanent magnet 40 is hardened with an adhesive. It is done. Specifically, as shown in FIGS. 11 to 13, the back wall surface 32 b of the magnet installation area 32 of the magnet holder 30 and the outer surface 40 b of the permanent magnet 40, the side surface 32 c of the magnet installation area 32 and the side surface 40 c of the permanent magnet 40 A gap 41 is formed between the inclined surface 32d of the magnet installation area 32 and the inclined surface 40d of the permanent magnet 40, and the thermosetting adhesive 42 is provided in the gap 41, and the permanent magnet 40 is formed. It is being fixed to the magnet holder 30 (magnet installation area | region 32). Further, a gap 43 is formed between the ceiling surface (inner bottom surface) 32 a of the magnet installation area 32 of the magnet holder 30 and the upper surface 40 e of the permanent magnet 40. The UV curable adhesive 44 is formed in the gap 43. The permanent magnet 40 is fixed to the magnet holder 30. The gap 41 is a first gap between the permanent magnet 40 and the surface (the back wall surface 32b, the inclined surface 32d, and the side surface 32c) forming the magnet installation region 32 in the direction perpendicular to the optical axis direction. This is a second gap between the permanent magnet 40 in the optical axis direction and the ceiling surface 32 a which is a surface forming the magnet installation area 32. FIG. 14 shows the state of the adhesive 42 by the thermosetting resin cured in the magnet installation area 32 of the magnet holder 30 and the adhesive 44 by the ultraviolet curing resin, and for the sake of convenience, the permanent magnet temporarily fixed. It shows a state in which 40 is removed. Thus, adhesive strength between the permanent magnet 40 and the surface forming the magnet installation area 32 can be enhanced by providing the adhesive in both the gap 41 and the gap 43. Further, by using the ultraviolet curable adhesive 44 and the thermosetting adhesive 42 in combination as the adhesive, it is possible to improve the productivity and the adhesive strength. For example, the permanent magnet 40 can be temporarily fixed to the magnet installation area 32 in a short time by the UV curable adhesive 44, and the permanent magnet 40 is firmly fixed to the magnet installation area 32 by the thermosetting adhesive 42 having high adhesive strength. It is possible to fix (final fix).

[Method of Manufacturing Lens Drive Device]
Next, a method of manufacturing the lens driving device in the present embodiment will be described. In the lens drive device manufacturing method according to the present embodiment, as shown in FIG. 15, the magnetic member 110, the first jig 120, and the second jig 130 are used as jigs for manufacturing the lens drive device. Use. As shown in FIGS. 16A and 16B, the magnetic member 110 is formed of a magnetic material such as iron. The magnetic member 110 is formed in a substantially rectangular shape (more strictly, an octagonal shape) when viewed from the top, and the upper portion 111 is formed to be larger than the lower portion 112. The lower portion 112 is formed with four side surfaces 113, and an upper bottom surface 114 is formed between the side surfaces of the upper portion 111 and the lower portion 112. 16A is a perspective view of the magnetic member 110 as viewed from the top side, and FIG. 16B is a perspective view of the magnetic member 110 as viewed from the bottom side.

As shown in FIGS. 17A and 17B, the first jig 120 is formed of a nonmagnetic material such as a resin material, and an opening 122 is formed on the upper surface side of the upper portion 121 of the first jig 120. It is done. The shape of the opening 122 is a shape corresponding to the magnetic member 110, and is formed in such a shape that substantially the entire portion enters from the lower portion 112 side of the magnetic member 110. The opening 122 is formed continuously to the lower portion 123 of the first jig 120, and when the magnetic member 110 is attached to the opening 122, the lower portion 112 of the magnetic member 110 is a first member. It will be located inside the lower part 123 of the tool 120. Four flat reference side surfaces 124 for defining the position of the inner side surface 40 a of the permanent magnet 40 are formed outside the lower portion 123 of the first jig 120, and between the upper portion 121 and the lower portion 123. The reference bottom surface 125 for defining the position of the bottom surface 40 f of the permanent magnet 40 is formed. That is, the upper portion 121 of the first jig 120 is formed to be larger than the lower portion 123, and the lower surface of the upper portion 121 at a portion protruding outward from the lower portion 123 is a flat reference bottom surface 125.

The outer shape of the lower portion 123 of the first jig 120 is formed to fit inside the magnet holder 30, and the size of the lower portion 123 (the forming position of the reference side surface 124) corresponds to the lower portion 123 of the magnet holder 30. The four reference side surfaces 124 are precisely defined so as to be substantially in surface contact with the inner side surfaces 37 formed around the four magnet mounting areas 32 of the magnet holder 30 when inserted inside. The projection amount of the lower portion 123 protruding from the upper portion 121 of the first jig 120, that is, the dimension from the reference bottom surface 125 to the tip end surface of the lower portion 123 is from the upper surface portion 33 of the magnet holder 30 to the bottom surface 40f of the permanent magnet 40 It is set with high precision so as to become the design reference dimension of. 17A is a perspective view of the first jig 120 as viewed from the top side, and FIG. 17B is a perspective view of the first jig 120 as viewed from the bottom side. In the present application, the first jig 120 may be described as a nonmagnetic member.

As shown in FIG. 15, the second jig 130 is formed of a nonmagnetic material such as a resin material, and a plurality of magnet holders 30 are provided on the upper surface of the second jig 130.

Recesses

131 and 132 are provided. Therefore, as shown in FIG. 18, on the upper surface portion 33 which is the upper surface side of the magnet holder 30, a plurality of

convex portions

35 and 36 corresponding to the plurality of

concave portions

131 and 132 of the second jig 130 are provided. It is provided. Further, a penetrating portion 133 penetrating vertically is formed at the central portion of the second jig 130, and the size of the penetrating portion 133 is set smaller than the lower portion 123 of the first jig 120. There is.

In the method of manufacturing the lens drive device according to the present embodiment, first, as shown in FIG. 19, the magnetic member 110 is inserted into the opening 122 on the upper surface of the first jig 120 from the lower portion 112 side.

Next, as shown in FIGS. 20A to 20C, the permanent magnet 40 is adsorbed so as to be in contact with the reference side surface 124 and the reference bottom surface 125 of the first jig 120. Since the magnetic member 110 is formed of a magnetic material, the permanent magnet 40 can be magnetically attracted to the reference side surface 124 and the reference bottom surface 125 of the first jig 120 via the first jig 120. Specifically, the inner side surface 40 a of the permanent magnet 40 is adsorbed to the reference side surface 124 of the first jig 120, and the bottom surface 40 f of the permanent magnet 40 is adsorbed to the reference bottom surface 125 of the first jig 120. 20A is a perspective view of this state as viewed from the top side, FIG. 20B is a perspective view of the bottom side, and FIG. 20C is a side view. In the present application, the reference side surface 124 may be described as a first reference surface, and the reference bottom surface 125 may be described as a second reference surface.

In the present embodiment, although it is preferable to use a magnetic member 110 to attract the permanent magnet 40 to the reference side surface 124 and the reference bottom surface 125 of the first jig 120 by magnetic force, the permanent magnet 40 is used as the first jig. Other methods may be used as long as they can contact the reference side surface 124 and the reference bottom surface 125 of 120 and maintain the contact state to some extent. Further, the magnetic member 110 and the first jig 120 may be formed of one magnetic material, but from the viewpoint of manufacturing, a method using the magnetic member 110 and the first jig 120 of the nonmagnetic member Is preferred.

Next, as shown in FIGS. 21A and 21B, the corresponding

protrusions

35 and 36 provided on the magnet holder 30 are inserted into the

recesses

131 and 132 provided on the upper surface of the second jig 130 and installed. . At this time, the magnet holder 30 is in a posture in which the upper surface portion 33 is directed to the upper surface side of the second jig 130 (a posture reverse to the state shown in FIG. 4). It is in contact with the upper surface of the tool 130. FIG. 21A is a perspective view of this state as viewed from the top, and FIG. 21B is a side view. Thereafter, an adhesive (not shown) is applied to the ceiling surface 32a, the back wall surface 32b, the side surface 32c, and the inclined surface 32d of the magnet installation area 32 of the magnet holder 30. Specifically, an ultraviolet curable adhesive is applied to the ceiling surface 32 a of the magnet installation area 32 of the magnet holder 30 so that the state as shown in FIG. 14 is obtained, and the magnet installation area of the magnet holder 30 is A thermosetting adhesive is applied to the back wall surface 32b, the side surface 32c, and the inclined surface 32d. At this time, a part of the thermosetting adhesive also adheres to the ceiling surface 32a. In addition, although the method of using two types of adhesives as mentioned above is preferable, only the ultraviolet curable adhesive is used on the ceiling surface 32a, the back wall surface 32b, the side surface 32c and the inclined surface 32d of the magnet installation area 32 of the magnet holder 30. May be applied. Moreover, in the magnet installation area | region 32 shown in FIG. 14, you may make the part which apply | coats an ultraviolet curable adhesive, and the part which apply | coats a thermosetting adhesive reverse. However, as in the present embodiment shown in FIG. 14, on a plurality of surfaces (back wall surface 32 b, side surface 32 c, inclined surface 32 d, and part of ceiling surface 32 a) forming magnet installation region 32 of magnet holder 30, By applying a thermosetting adhesive and fixing the permanent magnet 40 to the magnet installation area 32 with the thermosetting adhesive, the bonding area can be increased, and the bonding strength can be enhanced.

The step of applying an adhesive to the magnet installation area 32 of the magnet holder 30 and the permanent contact with the reference side surface 124 and the reference bottom surface 125 of the first jig 120 described with reference to FIG. 20A to FIG. Either of the step of adsorbing the magnet 40 may be performed first. Furthermore, the two steps may be performed in parallel.

Next, as shown in FIGS. 22A and 22B, the first jig 120 is brought close to the second jig 130, and the first fixing step is performed on the magnet installation area 32 of the magnet holder 30 to which the adhesive is applied. The permanent magnet 40 in a state of being adsorbed to the tool 120 is inserted. At this time, the four reference side surfaces 124 of the first jig 120 are in contact with the inner side surface 37 located around the inside of the four magnet installation areas 32 of the magnet holder 30. Thus, the inner side surface 37 around the magnet installation area 32 and the inner side surface 40 a of the permanent magnet 40 become flush with each other. The flat lower surface (tip surface) of the lower portion 123 of the first jig 120 is in contact with the upper surface of the second jig 130 located around the penetrating portion 133, and the bottom surface 40f of the permanent magnet 40 is , Protrudes from the magnet mounting area 32 by a slight fixed dimension. Thus, the distance from the upper surface portion 33 of the magnet holder 30 to the bottom surface 40f of the permanent magnet 40 is accurately determined. FIG. 22A is a perspective view of this state as viewed from the top, and FIG. 22B is a side view.

As shown in FIGS. 22A and 22B, the permanent magnet 40 in the direction perpendicular to the optical axis direction is obtained by inserting the lower portion 123 of the first jig 120 in a state in which the permanent magnet 40 is adsorbed inside the magnet holder 30. The thermosetting adhesive is interposed in the first gap (the gap 41) where the surface forming the magnet installation area 32 (the back wall surface 32b, the inclined surface 32d, the side surface 32c) opposes, and the optical axis direction In the second gap (the gap 43) where the permanent magnet 40 and the ceiling surface 32a which is the surface forming the magnet installation area 32 are opposed to each other, an ultraviolet curable adhesive is interposed. Thereafter, ultraviolet light is applied to the ultraviolet curable adhesive from the obliquely lower side through the penetration portion 133 of the second jig 130 to apply it to the ceiling surface 32 a of the magnet installation area 32 of the magnet holder 30. Cure the UV curable adhesive. Thereby, the permanent magnet 40 is fixed to the magnet installation area 32 of the magnet holder 30 with an adhesive. In addition, in order to cure by ultraviolet light, the first jig 120 is formed of a resin material which transmits ultraviolet light, such as acrylic resin. The second jig 130 is also preferably formed of a resin material that transmits ultraviolet light.

Next, as shown in FIG. 23, the magnetic member 110 put in the opening 122 of the first jig 120 is removed.

Next, as shown in FIG. 24, the first jig 120 and the second jig 130 are removed from the magnet holder 30. Thereafter, heat is applied to cure the thermosetting adhesive applied to the back wall surface 32b, the side surface 32c, the inclined surface 32d, and the ceiling surface 32a of the magnet installation area 32 of the magnet holder 30. As a result, it is possible to manufacture one in which each permanent magnet 40 is installed in a predetermined area in the magnet installation area 32 of the magnet holder 30. In addition, before removing the magnet holder 30 from the second jig 130, it is also possible to remove the first jig 120 with the magnetic member 110 attached together with the magnetic member 110.

In the present embodiment, each permanent magnet 40 can be fixed at a desired position with high accuracy to the magnet holder 30 by the above method. Therefore, as shown in FIG. 25, the inside surface 37 and the permanent magnet 40 around the magnet installation area 32 of the magnet holder 30 on the side of the first coil 60 (the side facing the first coil 60). It becomes flush with the side surface 40a. Further, the inner side surfaces 40a of the permanent magnets 40 located diagonally are parallel to each other, and the centers of the inner side surfaces 40a of the permanent magnets 40 located diagonally in a plan view seen from the direction along the optical axis direction. The distance B1 from the intersection point 212 of the

straight lines

211a and 211b connecting the two to the center of the inner side surface 40a of each permanent magnet 40 is equal. Also, the variation of the distance B1 to the center of the inner surface 40a of each permanent magnet 40 is smaller than the variation of the distance B2 from the intersection point 212 to the outer surface 40b of each permanent magnet 40. ing. In FIG. 25, the auxiliary line 211 c which is the starting point of the distances B 1 and B 2 is a straight line which is parallel to the inner side surface 40 a of the permanent magnet 40 and passes through the intersection point 212. Moreover, the dimension line which shows the distance B1 and the distance B2 with a continuous line is a straight line parallel to the straight line 211a. Therefore, the distance B2 is the distance between the intersection point 212 and the outer side surface 40b located on the extension of the straight line 211a.

Furthermore, as shown in FIG. 26, the inner side surface 40 a of the permanent magnet 40 and the back wall surface 32 b of the magnet installation area 32 of the magnet holder 30 are parallel to each other. The distance B3 between the magnet installation area 32 and the back wall surface 32b is equal.

Further, the distances B4 between the inner side surface 40a of the permanent magnet 40 and the inner side surface 37 around the magnet installation area 32 of the magnet holder 30 in which the permanent magnet 40 located at the diagonal of the permanent magnet 40 is inserted are equal to each other. It is formed. 26, the straight line (dimension line) indicating the distance B4 is a straight line orthogonal to the inner side surface 40a of the permanent magnet 40 and the inner side surface 37 of the magnet holder 30 (the inner side surface of the wall having the ceiling surface 32a). .

The lens drive device in the present embodiment is manufactured by the above manufacturing method. Therefore, as shown in FIGS. 11 to 13, the back wall surface 32 b of the magnet installation area 32 of the magnet holder 30 and the outer surface 40 b of the permanent magnet 40, the side surface 32 c of the magnet installation area 32 and the side surface 40 c of the permanent magnet 40, the magnet A gap 41 is formed between the inclined surface 32 d of the installation area 32 and the inclined surface 40 d of the permanent magnet 40, and a permanent magnet is formed by the adhesive 42 of thermosetting resin provided in the gap 41 in the direction perpendicular to the optical axis direction. 40 is fixed. Further, a gap 43 in the optical axis direction is formed between the ceiling surface 32a of the magnet installation area 32 of the magnet holder 30 and the upper surface 40e of the permanent magnet 40, and an adhesive made of ultraviolet curing resin provided in the gap 43. The permanent magnet 40 is fixed by 44.

Thereafter, the upper plate spring 20 and the lower plate spring 70 are attached to the upper surface side and the lower surface side of the lens holder 50 and the magnet holder 30 to which the first coil 60 is attached. Further, the magnetic sensor 81 is attached to the lower surface of the coil substrate 85 provided with the second coil 80, and the coil substrate 85 is fixed to the support 90. Then, the support 90 and the upper leaf spring 20 are connected by the suspension wire 91. After that, the lens driving device in the present embodiment can be manufactured by covering the case 10 on the support body 90 and fixing it.

In the above, although the thing of the structure which the magnetic member 110 and the 1st jig | tool 120 isolate | separate was demonstrated, you may use what the magnetic member 110 and the 1st jig | tool 120 integrated.

Moreover, although the case where an ultraviolet curing adhesive and a thermosetting adhesive were simultaneously apply | coated to the magnet installation area 32 of the magnet holder 30 was demonstrated in the above, the magnet installation area 32 of a thermosetting adhesive was demonstrated. Coating is not limited to simultaneous application with an ultraviolet-curable adhesive. For example, after curing the ultraviolet curable adhesive and removing the first jig 120 and the second jig 130 from the magnet holder 30, the permanent magnet 40 and the magnet installation area 32 in the direction perpendicular to the optical axis direction. A thermosetting adhesive may be placed in the first gap (the gap 41) facing the surface forming the and then heated to cure the thermosetting adhesive.

Moreover, in the above, although the thing which puts the lower part 123 of the 1st jig | tool 120 in the state which the permanent magnet 40 adsorb | sucked to the inner side of the magnet holder 30 was demonstrated, it is not limited to this. For example, after applying two kinds of adhesives to the magnet installation area 32 of the magnet holder 30, the permanent magnet 40 is put into the magnet installation area 32, and thereafter, the first jig 120 and the magnetic member 110 are respectively The permanent magnet 40 can be adsorbed to the first jig 120 by mounting it on the first jig 120, and then the UV curable adhesive can be cured.

〔The camera module〕
Next, the camera module in the present embodiment will be described. As shown in FIG. 27, the camera module according to the present embodiment uses the lens driving device according to the present embodiment, and a lens barrel 210 in which a lens (not shown) is incorporated is attached to the lens holder 50. It is done. That is, the lens barrel 210 as a lens body is held by the lens holder 50 by means such as an adhesive. Further, an imaging element 220 is attached to the side (imaging side) opposite to the side (subject side) where light is incident on the lens of the lens barrel 210. The imaging element 220 can capture a two-dimensional image, and is attached to the imaging substrate 221 by soldering or the like. The camera module in the present embodiment can form an image by forming an image on the imaging surface of the imaging element 220 by the light incident on the lens barrel 210.

As mentioned above, although an embodiment was explained in full detail, it is not limited to a specific embodiment, and various modification and change are possible within the limits indicated in a claim.

The present international application claims priority based on Japanese Patent Application No. 2017-171901 filed on Sep. 7, 2017, and the entire contents of that application are incorporated in the present international application.

10 case 20 upper plate spring 30 magnet holder 31 opening 32 magnet installation area 32a ceiling surface 32b back surface 32b back wall surface 32c side surface 32d inclined surface 33 top portion 34 bottom portion 35 convex portion 36 convex portion 37 inner side 40 permanent magnet 40a inner side 40b outside Side surface

40c Side surface

40d Inclination surface

40e Top surface

40f Bottom surface 41 Gap (first gap)
42 adhesive 43 gap (second gap)
44 adhesive 50 lens holder 60 first coil 70 lower flat spring 80 second coil 81 magnetic sensor 90 support 91 suspension wire 110 magnetic member 120 first jig 121 upper portion 122 opening portion 123 lower portion 124 reference side surface 1 reference plane)
125 Reference bottom (second reference surface)
130 Second jig

Claims

A lens holder capable of holding a lens body provided with a lens;
A first coil disposed on an outer peripheral side of the lens holder and operating the lens holder in the optical axis direction of the lens;
A plurality of magnets spaced apart from the first coil on an outer peripheral side of the first coil;
A magnet holder disposed on an outer peripheral side of the first coil and holding the magnet;
Upper and lower springs connecting the lens holder and the magnet holder;
A second coil disposed apart from the magnet in the optical axis direction of the lens, and operating the lens holder in a direction intersecting the optical axis direction of the lens;
A support for supporting the second coil;
A suspension wire connecting the support and the upper spring;
Have
The plurality of magnets are respectively installed in a plurality of magnet installation areas of the magnet holder, and
A lens driving device characterized in that a gap is provided in a direction perpendicular to the optical axis direction and in the optical axis direction between each of the magnets and a surface forming the magnet installation area.
The lens driving device according to claim 1, wherein the distance between the first coil and each of the magnets is equal.
The inner surface around the magnet installation area of the magnet holder and the inner surface of the magnet are flush with each other on the side where the first coil is installed. Lens drive device.
The magnet holder has a substantially rectangular outer shape in a plan view when viewed from the optical axis direction, and the magnet installation area of the magnet holder is provided at four corners of the magnet holder,
The magnet is installed in each of the magnet installation areas,
The inner surfaces on the first coil side of the magnets disposed diagonally are parallel to each other,
In a plan view as viewed from the optical axis direction, the distances from the intersection point at which the straight lines connecting the centers of the inner surfaces of the magnets disposed diagonally intersect to the centers of the inner surfaces of the magnets are equal. The lens drive device according to any one of claims 1 to 3, characterized in that:
The magnet holder has a substantially rectangular outer shape in a plan view when viewed from the optical axis direction, and the magnet installation area of the magnet holder is provided at four corners of the magnet holder,
The magnet is installed in each of the magnet installation areas,
The inner surfaces on the first coil side of the magnets disposed diagonally are parallel to each other,
A back wall surface parallel to the inner side surface of the magnet is formed in the magnet installation region of the magnet holder, and from the inner side surface of each magnet to the back wall surface of the magnet installation region of the magnet holder The lens driving device according to any one of claims 1 to 3, wherein the distances are equal.
The magnet holder has a substantially rectangular outer shape in a plan view when viewed from the optical axis direction, and the magnet installation area of the magnet holder is provided at four corners of the magnet holder,
The magnet is installed in each of the magnet installation areas,
An outer surface is formed on the opposite side of the inner surface on the first coil side of the magnet,
The inner surfaces on the first coil side of the magnets disposed diagonally are parallel to each other,
In a planar view viewed from the optical axis direction, the intersection point is not the variation in the distance from the intersection point where the straight line connecting the centers of the inner side faces of the magnets disposed diagonally intersects to the inner side face of each of the magnets The lens driving device according to any one of claims 1 to 3, wherein variation in the distance from the lens to the outer surface of each of the magnets is larger.
The magnet holder has a substantially rectangular outer shape in a plan view when viewed from the optical axis direction, and the magnet installation area of the magnet holder is provided at four corners of the magnet holder,
The magnet is installed in each of the magnet installation areas,
The inner surfaces on the first coil side of the magnets disposed diagonally are parallel to each other,
In a plan view viewed from the optical axis direction, the inner side surface of one of the magnets and the periphery of the magnet installation area of the magnet holder in which another magnet of the diagonal is installed on the one magnet The lens drive device according to any one of claims 1 to 3, wherein the distances to the inner surface are equal to one another.
A plurality of second coils are provided corresponding to the magnets, and
The lens driving device according to any one of claims 1 to 7, wherein the distance between each of the second coils and each of the magnets is equal.
Of the gap between the magnet and the surface forming the magnet installation area in the direction perpendicular to the optical axis direction, and the gap between the magnet and the surface forming the magnet installation area in the optical axis direction A thermosetting adhesive is provided in at least one of the gaps, and an ultraviolet curable adhesive is provided in the other gap, and the magnet and the magnet holder are thermosetting The lens driving device according to any one of claims 1 to 8, wherein the lens driving device is fixed by an adhesive of the present invention and an ultraviolet curing adhesive.
A thermosetting adhesive is provided in a gap between the magnet and a surface forming the magnet installation area in a direction perpendicular to the optical axis direction,
The lens drive device according to claim 9, wherein an ultraviolet-curable adhesive is provided in a gap between the magnet and a surface forming the magnet installation area in the optical axis direction.
A lens driving device according to any one of claims 1 to 10.
A lens body held by the lens holder;
An imaging element on which light transmitted through the lens of the lens body is incident;
A camera module characterized by having:
A lens holder capable of holding a lens body provided with a lens, a first coil disposed on the outer peripheral side of the lens holder for operating the lens holder in the optical axis direction of the lens, and an outer periphery of the first coil On the side, a magnet spaced apart from the first coil, and a magnet holder installed on the outer peripheral side of the first coil for holding the magnet, and connecting the lens holder and the magnet holder A spring and a lower spring, and a second coil disposed apart from the magnet in the optical axis direction of the lens and operating the lens holder in a direction intersecting the optical axis direction of the lens, and the second coil And a suspension wire for connecting the support and the upper spring, and the magnet is installed in a magnet installation area of the magnet holder. The method of manufacturing a's drive,
Providing an adhesive in a gap between the magnet and a surface forming the magnet installation area;
Curing the adhesive in a state in which the inner surface of the magnet is in contact with a first reference surface formed on a jig;
Removing the jig in contact with the magnet;
A method of manufacturing a lens driving device, comprising:
In the step of providing the adhesive, the magnet is applied to the magnet installation area of the magnet holder, and the magnet with the inner surface in contact with the first reference surface of the jig is the magnet The method of manufacturing a lens drive device according to claim 12, wherein the method is performed by placing the lens in an installation area.
The jig has a second reference surface orthogonal to the first reference surface,
The lens according to claim 12 or 13, wherein the step of curing the adhesive is performed in a state in which a bottom surface of the magnet facing the second coil is in contact with the second reference surface. Method of manufacturing drive device.
The adhesive is a UV curable adhesive,
A part of the jig is made of a material that transmits ultraviolet light,
The method for manufacturing a lens driving device according to any one of claims 12 to 14, wherein ultraviolet light is irradiated in the step of curing the adhesive.
The method for manufacturing a lens drive device according to any one of claims 12 to 15, wherein the jig is formed of a magnetic member and a nonmagnetic member surrounding the periphery of the magnetic member.
The gap between the magnet and the surface forming the magnet installation area is a first gap where the magnet and the surface forming the magnet installation area face each other in the direction perpendicular to the optical axis direction, and the optical axis And a second gap in which the magnet and the surface forming the magnet installation area face each other in the direction,
The method for manufacturing a lens drive device according to any one of claims 12 to 16, wherein in the step of providing the adhesive, an ultraviolet curable adhesive is interposed in the second gap.
And a step of interposing a thermosetting adhesive in the first gap, and a step of heating to cure the thermosetting adhesive after the step of removing the jig. The manufacturing method of the lens drive device of Claim 17.