JP2021004905A - Lens drive device, camera module, and manufacturing method for lens drive device - Google Patents

Abstract

To provide a lens drive device with a stable driving force for autofocus and camera shake correction.SOLUTION: The lens drive device has: a lens holder 50 holding a lens; a first coil 60 which operates the lens holder 50 in an optical axis direction of the lens; a plurality of magnets 40 arranged separately from the first coil 60; a magnet holder 30 holding the magnets 40; an upper spring 20 and a lower spring 70 connecting the lens holder 50 and the magnet holder 30; a second coil 80 which is arranged separately from the magnets 40 in a lens optical axis direction and operates the lens holder 50 in the direction crossing the lens optical axis; a support body 90 supporting the second coil 80; and a suspension wire 91 connecting the support body 90 and the upper spring 20. The magnets 40 are installed in magnet installation areas of the magnet holder 30 respectively, and a gap is provided between the respective magnets 40 and surfaces forming the magnet installation areas in the direction orthogonal to the optical axis and in the optical axis direction.SELECTED DRAWING: Figure 4

Description

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

In recent years, many mobile devices such as mobile phones are equipped with small cameras. Such a small camera is equipped with a lens and incorporates a lens driving device that drives a lens body (lens barrel to which the lens is mounted) for autofocus. Such a lens driving device is required to have a function of driving a lens body with a small size and accuracy, and in order to satisfy this demand, a lens holder (lens holding member) for holding the lens body is driven as a lens driving device. It is known that a magnetic circuit for this purpose is provided around the lens holder. Specifically, there is a lens holder in which a coil for autofocus is provided around the lens holder and a permanent magnet is further installed on the outside. The magnetic field of the permanent magnet crosses the coil for autofocus, and by passing an electric current through the coil for autofocus provided around the lens holder, the lens body is moved in the optical axis direction according to Fleming's left-hand rule. Drive in parallel to perform focusing.

Recently, in order to improve the quality of images taken by a small camera, a camera shake correction mechanism used in a general camera has been incorporated into the small camera. There are various methods for this image stabilization mechanism, such as a method of moving a lens, a method of moving an autofocus drive device, and a method of moving an image sensor (for example, CCD: Charge Coupled Device). Among the camera shake correction mechanisms, in a lens drive device that incorporates a method of moving the lens, for example, a camera shake correction coil is provided under the lens holder so as to cross the magnetic field of the permanent magnet, and a current is applied to the camera shake correction coil. The lens holder is driven in the direction perpendicular to the optical axis to correct camera shake.

JP-A-2016-38505

By the way, in the above-mentioned lens driving device, a permanent magnet is used, but the size of the permanent magnet varies. In this way, if the size of the permanent magnets varies, the distance from the permanent magnets to the coil for autofocus will change, and the strength of the magnetic field penetrating the coil for autofocus will differ, so the amount of current will be the same. Even if an electric current is applied, the driving force that drives the lens body varies. As described above, if 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 magnets varies, the distance from the permanent magnets to the coil for camera shake correction will change, and the strength of the magnetic field penetrating the coil for camera shake correction will differ, so the same amount of current will flow. However, the driving force that drives the lens body varies. As described above, if the driving force for driving the lens body varies, it may not be possible to perform appropriate image stabilization.

Therefore, there is a demand for a lens driving device in which the driving force for autofocus and camera shake correction is stable 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 first lens holder arranged on the outer peripheral side of the lens holder and operating the lens holder in the optical axis direction of the lens. A lens, a plurality of lenses arranged 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 to hold the magnet. The upper spring and the lower spring that connect the lens holder and the magnet holder are arranged apart from the magnet in the optical axis direction of the lens, and the lens holder is arranged in a direction intersecting the optical axis direction of the lens. It has 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, and the plurality of the magnets are a plurality of the magnet holders. There is a gap between each of the lenses and the surface forming the magnet installation area in the direction perpendicular to the optical axis direction and in the optical axis direction. Is provided.

According to the disclosed lens driving device, the driving force for autofocus and camera shake correction can be stabilized even if the size of the permanent magnet varies.

Perspective view of the lens driving device according to the present embodiment (1) Perspective view of the lens driving device according to the present embodiment (2) Top view of the lens driving device according to this embodiment An exploded perspective view of the lens driving device according to the present embodiment (1) An exploded perspective view of the lens driving device according to the present embodiment (2) Structural drawing of permanent magnet Bottom view of magnet holder Explanatory drawing of magnet holder Explanatory drawing of the relationship with the first coil when the size of the permanent magnet varies. Explanatory drawing of the relationship with the second coil when the size of the permanent magnet varies. Explanatory drawing of the lens driving device in this embodiment (1) Explanatory drawing (2) of the lens driving device in this embodiment Explanatory drawing (3) of the lens driving device in this embodiment Explanatory drawing (4) of the lens driving 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 of magnetic member used for manufacturing of lens driving apparatus in this embodiment Explanatory drawing of the first jig used for manufacturing the lens driving device in this embodiment Perspective view of magnet holder Process explanatory view of the manufacturing method of the lens drive device in this embodiment (1) Process explanatory view of the manufacturing method of the lens driving device in this embodiment (2) Process explanatory view of the manufacturing method of the lens driving device in this embodiment (3) Process explanatory view of the manufacturing method of the lens driving device in this embodiment (4) Process explanatory view of the manufacturing method of the lens driving device in this embodiment (5) Process explanatory view of the manufacturing method of the lens driving device in this embodiment (6) Explanatory drawing (5) of the lens driving device in this embodiment Explanatory drawing (6) of the lens driving device in this embodiment Structural drawing of the camera module in this embodiment

The embodiment for carrying out will be described below. The same members and the like are designated by the same reference numerals and the description thereof will be omitted.

[Lens drive device]
The lens driving device according to the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view seen from the upper side of the lens driving device according to the present embodiment, FIG. 2 is a perspective view seen from the lower side of the lens driving device according to the present embodiment, and FIG. It is a top view of the lens driving device in this embodiment. FIG. 4 is an exploded perspective view seen from the upper side of the lens driving device in the present embodiment, and FIG. 5 is an exploded perspective view seen from the lower side of the lens driving device in the present embodiment. The direction indicated 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 perpendicular to the paper surface in FIG.

As shown in FIGS. 1 to 3, the lens driving device according to the present embodiment is formed in a rectangular parallelepiped shape in appearance. As shown in FIGS. 4 and 5, the lens driving device according to the present embodiment includes a case 10, an upper leaf spring 20, a magnet holder 30, a permanent magnet 40, a lens holder 50, a first coil 60, and a lower leaf spring 70. , A second coil 80, a magnetic sensor 81, a 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 driving device of the present embodiment, the lens holder 50 has an opening 51 formed in the central portion thereof so that a lens body such as a lens barrel (not shown) can be installed, and the lens holder 50 has a first opening around the lens holder 50. The coil 60 of 1 is provided. The first coil 60 is a coil for autofocusing the lens.

The magnet holder 30 is formed in a substantially rectangular shape (substantially square shape) in a plan view seen from the optical axis direction, and is provided with an opening 31 in which the lens holder 50 and the first coil 60 are inserted in the central portion. A magnet installation area 32 in which a permanent magnet 40 is installed is provided at each of the four corners located around the opening 31. Therefore, the permanent magnets 40 are arranged around the first coil 60 so as to face each other apart from the first coil 60.

Two upper leaf springs 20 are provided facing each other on the upper side (subject side) of the magnet holder 30 and the lens holder 50. The outer portion 21 of the upper leaf spring 20 is fixed to the 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. Has been done. Therefore, the upper leaf spring 20 is 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 space between the two becomes the spring portion 23 and functions 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, two lower leaf springs 70 are provided on the lower side (imaging side) of the magnet holder 30 and the lens holder 50 so as to face each other. The outer portion 71 of the lower leaf spring 70 is fixed to the bottom portions 34 at the four corners of the magnet holder 30 by caulking or the like, and the inner portion 72 of the lower leaf spring 70 is fixed to the bottom portion 53 of the lens holder 50 by an adhesive or the like. Has been done. Therefore, the lower leaf spring 70 is the outer portion 71 of the lower leaf spring 70 connected to the bottom surface portion 34 of the magnet holder 30, and the inner portion 72 of the lower leaf spring 70 connected to the bottom surface portion 53 of the lens holder 50. The space between the two becomes the spring portion 73 and functions as a spring.

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

Further, two coil substrates 85 are provided facing each other between the lower leaf spring 70 under the magnet holder 30 and the support 90, and the coil substrate 85 and the support 90 are permanently separated from each other. 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 composed of a multilayer substrate, and one second coil 80 is formed on each side of one coil substrate 85. The second coil 80 is composed 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 arranged so as to face each other at a distance from the four permanent magnets 40.

The support 90 is formed with a wiring pattern for passing a current through the first coil 60 and the second coil 80 and for transmitting a signal detected by the magnetic sensor 81. 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. Further, the four corners of the support 90 having a rectangular plan view and the connecting portions 24 at the four corners of the upper leaf spring 20 are each connected by four suspension wires 91, and the magnet holder is connected to the support 90. The 30 and the lens holder 50 can be moved in a direction intersecting the optical axis direction (a substantially vertical direction). Further, the suspension wire 91 and the upper leaf spring 20 are formed of a conductive metal material, and the wiring (wire) forming the first coil 60 is formed on each of the two upper leaf springs 20. Both ends 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, from the wiring pattern of the support 90, a current can be passed through the first coil 60 via the suspension wire 91 and the upper leaf spring 20. Further, a coil substrate 85 having a second coil 80 is installed and supported on the support 90, and a current can be passed through the second coil 80 from the wiring pattern of the support 90.

Next, the permanent magnet 40 will be described in more detail. As shown in FIG. 6, the permanent magnet 40 is formed in a substantially hexagonal columnar shape. 6 (a) is a top view of the permanent magnet 40 seen from the optical axis direction, and FIG. 6 (b) is a front view seen from the inside (the side of the first coil 60). (C) is a rear view seen from the outside, and FIG. 6 (d) is a side view.

The external shape of the permanent magnet 40 is formed on the inner side surface 40a on the side of the first coil 60 (the side facing the first coil 60) and on the opposite side of the inner side surface 40a, substantially parallel to the inner side surface 40a. The outer surface 40b, the side surface 40c formed substantially perpendicular to the inner side surface 40a from both ends of the inner side surface 40a, the inclined surface 40d, the upper surface 40e and the upper surface 40e formed so as to cut the corner between the side surface 40c and the outer surface 40b. It is formed by the bottom surface 40f. Therefore, the side surface of the hexagonal prism is formed by the inner side surface 40a, the outer surface 40b, the two side surfaces 40c, and the two inclined surfaces 40d. The angle formed by the inner side 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 vertical, and the angle formed by the outer surface 40b and the side surface 40c and the inclined surface 40d is about. It is 45 °. It should be noted that each surface is formed by a flat surface, and the corner between each surface may be chamfered. The permanent magnet 40 is a surface on which the upper surface 40e and the lower surface 40f face each other in the optical axis direction. Further, each permanent magnet 40 is magnetized so that the inner side surface 40a and the outer side surface 40b side have different magnetic poles, and the inner side surfaces 40a of the four permanent magnets 40 are magnetized so as to have the same magnetic poles. ing. For example, the inner side surface 40a of all the permanent magnets 40 is the north pole, and the outer side surface 40b side is the south pole.

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

Next, the autofocus function and the image stabilization 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 by passing an electric current 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 passing a current through the first coil 60, the lens holder 50 can be moved in the optical axis direction with respect to the magnet holder 30, and the lens can be autofocused.

Similarly, a magnetic field penetrating the second coil 80 is generated by the permanent magnet 40 installed in the magnet holder 30, and by passing an electric current through the second coil 80, the permanent magnet 40 and the second coil 80 are formed. A force is generated between them. Since the coil substrate 85 having the second coil 80 is fixed on the support 90, the force acts in the direction of moving 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 elastic suspension wire 91. Therefore, by passing a current through 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. As a result, camera shake correction can be performed. In the four second coils 80, two second coils 80 located diagonally on one side are connected in series, and the remaining two second coils 80 located diagonally on the other side are connected. They are connected in series.

By the way, it is difficult to manufacture many permanent magnets 40 having exactly the same size, and the sizes vary. Therefore, when the outer surface 40b of the permanent magnet 40 is aligned with the back wall surface 32b of the magnet installation area 32 and the permanent magnet 40 is installed in the magnet installation area 32 of the magnet holder 30, the inner side surface 40a of the permanent magnet 40 and the first There is a difference in the distance between the coil 60 and the 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. is there. On the other hand, as shown in FIG. 9B, when the inner surface 40a and the outer surface 40b of the permanent magnet 40 are thick, the inner surface 40a of the permanent magnet 40 and the first coil 60 are combined. The interval La2 is narrower than the interval La1 in the case shown in FIG. 9A. In this case, the magnetic field penetrating the first coil 60 is strengthened, and when the same current as shown in FIG. 9A is passed through the first coil 60, the force acting on the first coil 60 is as shown in FIG. 9 (a). It is stronger than the case shown in a).

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

In this way, if the force acting on the first coil 60 reflects the variation in the size of the permanent magnet 40 and varies, proper autofocus cannot be performed.

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. On the other hand, as shown in FIG. 10B, when the thickness of the upper surface 40e and the bottom surface 40f of the permanent magnet 40 is thick, the distance Lb2 between the bottom surface 40f of the permanent magnet 40 and the second coil 80 is set. , It is narrower than the interval Lb1 in the case shown in FIG. 10 (a). In this case, the magnetic field penetrating the second coil 80 is strengthened, and when the same current as shown in FIG. 10A is passed through the second coil 80, the force acting on the permanent magnet 40 (on the second coil 80). The reaction force of the working force) is stronger than that shown in FIG. 10 (a).

Further, as shown in FIG. 10C, when the thickness of the upper 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 shown in FIG. The interval is wider than the interval Lb1 in the case shown in 10 (a). In this case, the magnetic field penetrating the second coil 80 weakens, and even if the same current as in the case of FIG. 10A is passed through the second coil 80, the force acting on the permanent magnet 40 is as shown in FIG. 10A. It is weaker than the case shown in.

As described above, if the force acting on the second coil 80 reflects the variation in the size of the permanent magnet 40 and varies, the camera shake correction may not be performed properly. Since the magnet holder 30 is manufactured using a mold or the like, it can be manufactured with higher dimensional accuracy than the permanent magnet 40.

In the lens driving device of the present embodiment, the magnet installation area 32 has a shape larger than the external dimensions 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 installing the permanent magnet 40, after the permanent magnet 40 is aligned so as to be in a desired position, the gap between the magnet installation area 32 of the magnet holder 30 and the permanent magnet 40 is hardened with an adhesive. Has been done. Specifically, as shown in FIGS. 11 to 13, the back wall surface 32b of the magnet installation area 32 of the magnet holder 30 and the outer surface 40b of the permanent magnet 40, the side surface 32c of the magnet installation area 32 and the side surface 40c 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 heat-curable adhesive 42 is provided in the gap 41 to form the permanent magnet 40. It is fixed to the magnet holder 30 (magnet installation area 32). Further, a gap 43 is formed between the ceiling surface (inner bottom surface) 32a of the magnet installation area 32 of the magnet holder 30 and the upper surface 40e of the permanent magnet 40, and the gap 43 is filled with an ultraviolet curable adhesive 44. Is provided, and the permanent magnet 40 is fixed to the magnet holder 30. The gap 41 is a first gap between the permanent magnet 40 in the direction perpendicular to the optical axis direction and the surface (back wall surface 32b, inclined surface 32d, side surface 32c) forming the magnet installation area 32, and the gap 43 is This is a second gap between the permanent magnet 40 in the optical axis direction and the ceiling surface 32a, which is a surface forming the magnet installation area 32. Note that FIG. 14 shows the state of the adhesive 42 made of thermosetting resin and the adhesive 44 made of ultraviolet curable resin that are cured in the magnet installation area 32 of the magnet holder 30, and is a permanent magnet once fixed for convenience. The state in which 40 is removed is shown. By providing the adhesive in both the gap 41 and the gap 43 in this way, it is possible to increase the adhesive strength between the permanent magnet 40 and the surface forming the magnet installation area 32. 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 with the ultraviolet curable adhesive 44, and the permanent magnet 40 is strengthened to the magnet installation area 32 with the thermosetting adhesive 42 having high adhesive strength. It is possible to fix (mainly fix) to.

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

As shown in FIG. 17, the first jig 120 is formed of a non-magnetic 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. .. The shape of the opening 122 is a shape corresponding to the magnetic member 110, and is formed so that substantially the entire portion can be inserted from the lower 112 side of the magnetic member 110. The opening 122 is continuously formed up to the lower part 123 of the first jig 120, and when the magnetic member 110 is attached to the opening 122, the lower part 112 of the magnetic member 110 is first cured. It is located inside the lower part 123 of the jig 120. On the outside of the lower portion 123 of the first jig 120, four flat reference side surfaces 124 for defining the position of the inner side surface 40a of the permanent magnet 40 are formed, and between the upper portion 121 and the lower portion 123. Is formed with a reference bottom surface 125 for defining the position of the bottom surface 40f of the permanent magnet 40. That is, the upper portion 121 of the first jig 120 is formed larger than the lower portion 123, and the lower surface of the upper portion 121 in the 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 so as to fit inside the magnet holder 30, and the size of the lower portion 123 (the forming position of the reference side surface 124) is such that the lower portion 123 of the magnet holder 30 is formed. When placed inside, the four reference side surfaces 124 are accurately sized so as to substantially surface contact with the inner side surfaces 37 formed around the four magnet installation areas 32 of the magnet holder 30. Further, the amount of protrusion 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 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 accuracy so that it becomes the standard dimension in the design of. 17 (a) is a perspective view of the first jig 120 viewed from the top surface side, and FIG. 17 (b) is a perspective view of the first jig 120 viewed from the bottom surface side. In the present application, the first jig 120 may be described as a non-magnetic member.

As shown in FIG. 15, the second jig 130 is formed of a non-magnetic material such as a resin material, and a plurality of magnet holders 30 for installing the magnet holder 30 are placed on the upper surface of the second jig 130. Recesses 131 and 132 are provided. Therefore, as shown in FIG. 18, the upper surface portion 33 on the upper surface side of the magnet holder 30 has a plurality of convex portions 35 and 36 corresponding to the plurality of concave portions 131 and 132 of the second jig 130. It is provided. Further, a penetrating portion 133 penetrating vertically is formed in the central portion of the second jig 130, and the size of the penetrating portion 133 is set smaller than that of the lower portion 123 of the first jig 120. There is.

In the method of manufacturing the lens driving 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 112 side.

Next, as shown in FIG. 20, the permanent magnet 40 is attracted 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 made 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 40a of the permanent magnet 40 is attracted to the reference side surface 124 of the first jig 120, and the bottom surface 40f of the permanent magnet 40 is attracted to the reference bottom surface 125 of the first jig 120. 20 (a) is a perspective view of this state viewed from the top surface side, FIG. 20 (b) is a perspective view viewed from the bottom surface side, and FIG. 20 (c) is a side view. Further, in the present application, the reference side surface 124 may be described as the first reference plane, and the reference bottom surface 125 may be described as the second reference plane.

In the present embodiment, a method of attracting the permanent magnet 40 to the reference side surface 124 and the reference bottom surface 125 of the first jig 120 by magnetic force using the magnetic member 110 is preferable, but the permanent magnet 40 is attached to the first jig 120. Other methods may be used as long as they can be brought into contact with the reference side surface 124 and the reference bottom surface 125 of the 120 and the contact state can be maintained 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 of using the magnetic member 110 and the first jig 120 of the non-magnetic member. Is preferable.

Next, as shown in FIG. 21, the corresponding convex portions 35 and 36 provided in 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 faces the upper surface side of the second jig 130 (the posture shown in FIG. 4 is upside down), and the upper surface portion 33 is in the second curing position. It is in contact with the upper surface of the tool 130. 21 (a) is a perspective view of this state as viewed from the upper surface side, and FIG. 21 (b) is a side view. After that, 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 32a 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 applied. A thermosetting adhesive is applied to the back wall surface 32b, the side surface 32c, and the inclined surface 32d of the 32. At this time, a part of the thermosetting adhesive also adheres to the ceiling surface 32a. Although it is preferable to use two types of adhesives as described above, only the ultraviolet curable adhesive 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. May be applied. Further, in the magnet installation area 32 shown in FIG. 14, the portion to which the ultraviolet curable adhesive is applied and the portion to which the thermosetting adhesive is applied may be reversed. However, as in the present embodiment shown in FIG. 14, on a plurality of surfaces (back wall surface 32b, side surface 32c, inclined surface 32d, and part of ceiling surface 32a) forming the magnet installation area 32 of the 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 widened and the bonding strength can be increased.

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

Next, as shown in FIG. 22, the first jig 120 is brought close to the second jig 130, and the first jig 120 is placed in the magnet installation area 32 of the magnet holder 30 to which the adhesive is applied. Insert the permanent magnet 40 in the attracted state. At this time, the four reference side surfaces 124 of the first jig 120 are in contact with the inner side surfaces 37 located around the inside of the four magnet installation areas 32 of the magnet holder 30, respectively. As a result, the inner side surface 37 around the magnet installation area 32 and the inner side surface 40a of the permanent magnet 40 are flush with each other. Further, 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 , It protrudes from the magnet installation area 32 by a slight constant dimension. As a result, 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. 22 (a) is a perspective view of this state as viewed from the upper surface side, and FIG. 22 (b) is a side view.

As shown in FIGS. 22 (a) and 22 (b), the lower portion 123 of the first jig 120 in the state where the permanent magnet 40 is attracted is inserted inside the magnet holder 30 so as to be perpendicular to the optical axis direction. A thermosetting adhesive is interposed in the first gap (gap 41) where the permanent magnet 40 and the surface (back wall surface 32b, inclined surface 32d, side surface 32c) forming the magnet installation area 32 face each other in the same direction. At the same time, an ultraviolet curable adhesive is interposed in the second gap (gap 43) where the permanent magnet 40 and the ceiling surface 32a, which is the surface forming the magnet installation area 32, face each other in the optical axis direction. .. After that, the ultraviolet rays are applied to the ceiling surface 32a of the magnet installation area 32 of the magnet holder 30 by irradiating the ultraviolet curable adhesive from the diagonally lower side through the penetrating portion 133 of the second jig 130. It cures the UV curable adhesive. As a result, the permanent magnet 40 is fixed to the magnet installation area 32 of the magnet holder 30 with an adhesive. In order to cure with ultraviolet rays, the first jig 120 is made of a resin material that transmits ultraviolet rays, for example, acrylic resin. Further, the second jig 130 is also preferably formed of a resin material that transmits ultraviolet rays.

Next, as shown in FIG. 23, the magnetic member 110 inserted 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. After that, 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 a magnet holder 30 in which each permanent magnet 40 is installed in a predetermined area in the magnet installation area 32. 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 accurately fixed to the magnet holder 30 at a desired position by the above method. Therefore, as shown in FIG. 25, the inner side surface 37 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) and the inside of the permanent magnet 40. The side surface 40a is 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 are aligned with each other in a plan view viewed from a direction along the optical axis direction. The distance B1 from the intersection 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 formed equally. Further, the variation of the distance B1 from the intersection 212 to the outer surface 40b of each permanent magnet 40 is formed so as to be smaller than the variation of the distance B1 to the center of the inner side surface 40a of each permanent magnet 40. ing. In FIG. 25, the auxiliary line 211c, which is the starting point of the distances B1 and B2, is a straight line parallel to the inner side surface 40a of the permanent magnet 40 and passing through the intersection 212. Further, the dimension line showing the distance B1 and the distance B2 by a solid line is a straight line parallel to the straight line 211a. Therefore, the distance B2 is the distance between the intersection 212 and the outer surface 40b located on the extension line of the straight line 211a.

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

Further, the distance 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 diagonally of the permanent magnet 40 is inserted is equal. It is formed. In FIG. 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 (inner side surface of the wall portion having the ceiling surface 32a) of the magnet holder 30. ..

The lens driving device according to the present embodiment is manufactured by the above manufacturing method. Therefore, as shown in FIGS. 11 to 13, the back wall surface 32b of the magnet installation area 32 of the magnet holder 30 and the outer surface 40b of the permanent magnet 40, the side surface 32c of the magnet installation area 32 and the side surface 40c of the permanent magnet 40, and the magnet. A gap 41 is formed between the inclined surface 32d of the installation area 32 and the inclined surface 40d of the permanent magnet 40, and the permanent magnet is formed by the adhesive 42 made of the 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 an ultraviolet curable resin provided in the gap 43. The permanent magnet 40 is fixed by 44.

After that, the upper leaf spring 20 and the lower leaf 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, a 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 according to the present embodiment can be manufactured by covering the case 10 with the support 90 and fixing the case 10.

In the above, the structure in which the magnetic member 110 and the first jig 120 are separated has been described, but the one in which the magnetic member 110 and the first jig 120 are integrated may be used.

Further, in the above, the case where the ultraviolet curable adhesive and the thermosetting adhesive are simultaneously applied to the magnet installation area 32 of the magnet holder 30 has been described, but the magnet installation area 32 of the thermosetting adhesive has been described. The application to is not limited to the one applied at the same time as the ultraviolet curable adhesive. For example, after curing an 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 are formed in a direction perpendicular to the optical axis direction. A thermosetting adhesive may be placed in the first gap (gap 41) facing the surface forming the magnet, and then heated to cure the thermosetting adhesive.

Further, in the above description, the lower portion 123 of the first jig 120 in which the permanent magnet 40 is attracted is inserted inside the magnet holder 30, but the present invention 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 then the first jig 120 and the magnetic member 110 are placed on the magnet holder 30 respectively. It is also possible to attach the permanent magnet 40 to the first jig 120 by attaching it to the first jig 120, and then cure the ultraviolet curable adhesive.

〔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 incorporating a lens (not shown) is attached to the lens holder 50. Has been done. That is, the lens barrel 210, which is the lens body, is held by the lens holder 50 by means such as an adhesive. Further, an image sensor 220 is attached to a side (imaging side) opposite to the side (subject side) where light is incident on the lens of the lens barrel 210. The image sensor 220 is capable of capturing a two-dimensional image, and is attached to the image pickup board 221 by soldering or the like. The camera module in the present embodiment can image an image on the image pickup surface of the image pickup device 220 by the light incident on the lens barrel 210.

Although the embodiments have been described in detail above, the embodiments are not limited to the specific embodiments, and various modifications and changes can be made within the scope of the claims.

10 Case 20 Upper leaf spring 30 Magnet holder 31 Opening 32 Magnet installation area 32a Ceiling surface 32b Back wall surface 32c Side surface 32d Inclined surface 33 Top surface part 34 Bottom part 35 Convex part 36 Convex part 37 Inner side surface 40 Permanent magnet 40a Inner side surface 40b Outside Side surface 40c Side surface 40d Inclined 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 leaf spring 80 Second coil 81 Magnetic sensor 90 Support 91 Suspension wire 110 Magnetic member 120 First jig 121 Upper 122 Opening 123 Lower 124 Reference side surface (first Reference plane of 1)
125 Reference bottom surface (second reference surface)
130 Second jig

Claims (18)

A lens holder that can hold a lens body equipped with a lens,
A first coil arranged 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 arranged apart from the first coil on the outer peripheral side of the first coil,
A magnet holder installed on the outer peripheral side of the first coil and holding the magnet,
An upper spring and a lower spring that connect the lens holder and the magnet holder,
A second coil that is arranged apart from the magnet in the optical axis direction of the lens and operates the lens holder in a direction that intersects the optical axis direction of the lens.
A support that supports the second coil and
A suspension wire connecting the support and the upper spring,
Have,
The plurality of magnets are installed in the plurality of magnet installation areas of the magnet holder, respectively.
A lens driving device characterized in that a gap is provided between each of the magnets and a surface forming the magnet installation region in a direction perpendicular to the optical axis direction and in the optical axis direction. The lens driving device according to claim 1, wherein the distance between the first coil and each of the magnets is equal. The first or second aspect of the magnet holder, wherein the inner surface of the magnet holder around the magnet installation area 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 areas of the magnet holder are provided at four corners of the magnet holder.
The magnet is installed in each of the magnet installation areas.
The inner surfaces of the magnets installed diagonally on the first coil side are parallel to each other.
In a plan view from the optical axis direction, the distances from the intersections of the intersections of the straight lines connecting the centers of the inner surfaces of the magnets installed diagonally to the centers of the inner surfaces of the magnets are equal. The lens driving device according to any one of claims 1 to 3, wherein the lens driving device is characterized. The magnet holder has a substantially rectangular outer shape in a plan view when viewed from the optical axis direction, and the magnet installation areas of the magnet holder are provided at four corners of the magnet holder.
The magnet is installed in each of the magnet installation areas.
The inner surfaces of the magnets installed diagonally on the first coil side are parallel to each other.
A back wall surface parallel to the inner side surface of the magnet is formed in the magnet installation area of the magnet holder, and from the inner side surface of each magnet to the back wall surface of the magnet installation area 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 areas of the magnet holder are 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 of the magnet on the first coil side.
The inner surfaces of the magnets installed diagonally on the first coil side are parallel to each other.
In a plan view from the optical axis direction, the intersection is more than the variation in the distance from the intersection of the straight lines connecting the centers of the inner surfaces of the magnets installed diagonally to the inner surface of each magnet. The lens driving device according to any one of claims 1 to 3, wherein the variation in the distance from the magnet to the outer surface of each magnet 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 areas of the magnet holder are provided at four corners of the magnet holder.
The magnet is installed in each of the magnet installation areas.
The inner surfaces of the magnets installed diagonally on the first coil side are parallel to each other.
In a plan view seen from the optical axis direction, the inner surface of one of the magnets and the periphery of the magnet installation area of the magnet holder in which the other magnet diagonal to the one magnet is installed The lens driving device according to any one of claims 1 to 3, wherein the distance from the inner surface is equal to each other. A plurality of the second coils are installed corresponding to the magnets.
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. 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 the adhesive of the above and an ultraviolet curable adhesive. A thermosetting adhesive is provided in the gap between the magnet and the surface forming the magnet installation region in the direction perpendicular to the optical axis direction.
The lens driving 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 region in the optical axis direction. The lens driving device according to any one of claims 1 to 10.
The lens body held in the lens holder and
An image sensor in which light transmitted through the lens of the lens body is incident, and
A camera module characterized by having. A lens holder capable of holding a lens body provided with a lens, a first coil arranged on the outer peripheral side of the lens holder and operating the lens holder in the optical axis direction of the lens, and an outer circumference of the first coil. On the side, a magnet arranged apart from the first coil, a magnet holder installed on the outer peripheral side of the first coil and holding the magnet, and the lens holder and the magnet holder are connected to each other. A second coil, which is arranged apart from the magnet in the optical axis direction of the lens and operates the lens holder in a direction intersecting the optical axis direction of the lens, and a second coil. The lens has a support for supporting the lens and a suspension wire for connecting the support and the upper spring, and the magnet is used in a method of manufacturing a lens driving device installed in a magnet installation area of the magnet holder.
The step of providing an adhesive in the gap between the magnet and the surface forming the magnet installation area, and
A step of curing the adhesive with the inner surface of the magnet in contact with the first reference surface formed on the jig.
The process of removing the jig in contact with the magnet and
A method for manufacturing a lens driving device, which comprises. In the step of providing the adhesive, the adhesive is applied to the magnet installation area of the magnet holder, and the magnet is attached to the magnet in a state where the inner surface is in contact with the first reference surface of the jig. The method for manufacturing a lens driving device according to claim 12, wherein the method is performed by putting the magnet in an installation area. The jig has a second reference plane orthogonal to the first reference plane.
The lens according to claim 12 or 13, wherein the step of curing the adhesive is performed in a state where the bottom surface of the magnet facing the second coil is in contact with the second reference surface. How to manufacture the drive unit. The adhesive is an ultraviolet curable adhesive and is
A part of the jig is made of a material that transmits ultraviolet rays.
The method for manufacturing a lens driving device according to any one of claims 12 to 14, wherein in the step of curing the adhesive, ultraviolet rays are irradiated. The method for manufacturing a lens driving device according to any one of claims 12 to 15, wherein the jig is formed of a magnetic member and a non-magnetic member surrounding the magnetic member. The gap between the magnet and the surface forming the magnet installation area is the first gap in which 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. In the direction, it has a second gap in which the magnet and the surface forming the magnet installation region face each other.
The method for manufacturing a lens driving 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. It is characterized by having a step of interposing a thermosetting adhesive in the first gap, and having a step of heating to cure the thermosetting adhesive after the step of removing the jig. The method for manufacturing a lens driving device according to claim 17.