JP2014222277A - Optical device and method for manufacturing optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device including a movable body holding a lens and a fixed body movably holding the movable body, in which even when the device is miniaturized, the movable body can be properly moved and which can reduce the manufacturing cost of a magnet for driving for moving the movable body.SOLUTION: An optical device 1 includes a movable body 2 holding a lens for photographing, a fixed body 3 movably holding the movable body 2, a magnet for driving 18 and a coil for driving 17 for moving the movable body 2 relatively to the fixed body 3, and metal members 24 and 25 fixed to the magnet for driving 18. The coil for driving 17 fixed to the fixed body 3 and the magnet for driving 18 fixed to the movable body 2 are arranged to face each other across a predetermined gap. The magnet for driving 18 and the metal members 24 and 25 are joined to each other by tin layers 26 and 27 formed by melting and solidifying tin foil arranged between the magnet for driving 18 and the metal members 24 and 25.

Description

  The present invention relates to an optical device including a movable body that holds a photographing lens and a fixed body that movably holds the movable body. The present invention also relates to a method for manufacturing such an optical device.

  Conventionally, an optical device having an autofocus function and a shake correction function is known (see, for example, Patent Document 1). The optical device described in Patent Document 1 corrects a shake of an optical image, a camera module that holds a lens and an image sensor, a fixed body that holds the camera module so that the optical axis of the lens is tilted, and an optical image. And a swing drive mechanism for swinging the camera module with respect to the fixed body. The camera module is formed in a substantially quadrangular prism shape having a substantially square shape when viewed from the optical axis direction. The fixed body includes a substantially square cylindrical case body that constitutes the outer peripheral surface of the optical device. The swing drive mechanism includes four drive coils and four substantially rectangular drive magnets arranged to face each of the four drive coils.

  In the optical device described in Patent Document 1, each of the four drive coils is fixed inside each of the four side portions of the case body. Each of the four drive magnets is fixed to the outside of each of the four side portions of the camera module. Magnet connecting members formed in a substantially square frame shape are fixed to both end faces of the driving magnet in the optical axis direction, and the four driving magnets are connected by the magnet connecting members. A nickel plating layer is formed on the entire surface of the driving magnet and the entire surface of the magnet coupling member. Further, the driving magnet and the magnet coupling member are joined by a joining layer made of a tin-based metal. In the drive magnet before being joined to the magnet coupling member, a tin plating layer is formed on the entire surface of the drive magnet so as to cover the nickel plating layer, and this tin plating layer is melted and solidified to drive A joining layer for joining the magnet and the magnet coupling member is formed.

JP 2012-118213 A

  In the optical device described in Patent Document 1, the driving magnet and the magnet coupling member are joined by the joining layer formed by melting and solidifying the tin plating layer on the surface of the driving magnet before being joined to the magnet coupling member. Therefore, the bonding layer does not protrude from between the driving magnet and the magnet coupling member. Therefore, even when the optical device is miniaturized and the gap between the driving magnet and the driving coil is narrowed, the gap between the bonding layer and the driving coil can be formed with high accuracy. It becomes possible to prevent interference between the bonding layer and the driving coil.

  However, in the optical device described in Patent Document 1, since the tin plating layer is formed on the entire surface of the driving magnet, the thickness of the driving magnet is increased by the amount of the tin plating layer. Further, in this optical device, when the bonding layer is formed, the tin plating layer formed on the entire surface of the drive magnet is melted and solidified, so that the drive magnet has a surface facing the drive coil. The melted tin solidifies into particles, and tin particles may be formed on the surface of the drive magnet facing the drive coil. If the thickness of the driving magnet is increased, when the camera module swings, the driving magnet and the driving coil interfere with each other, which may hinder the swinging operation of the camera module. Also, if tin particles are formed on the surface of the drive magnet facing the drive coil, when the camera module swings, the tin particles interfere with the drive coil, and the camera module swings. May interfere with operation.

  This problem can be solved if a tin plating layer is formed only on the joint surface of the driving magnet before being joined to the magnet coupling member with the magnet coupling member. However, in order to form a tin plating layer only on the joint surface of the driving magnet before being joined to the magnet coupling member with the magnet coupling member, when the tin plating layer is formed on the driving magnet, It is necessary to cover the surface of the driving magnet excluding the joint surface with a mask, which increases the manufacturing cost of the driving magnet.

  Accordingly, an object of the present invention is to provide an optical device including a movable body that holds a lens for photographing and a fixed body that movably holds the movable body, even if the device is downsized. It is an object of the present invention to provide an optical device that can appropriately move the lens and reduce the manufacturing cost of a driving magnet for moving a movable body. Moreover, the subject of this invention is providing the manufacturing method of this optical apparatus.

  In order to solve the above problems, an optical device of the present invention is configured to move a movable body relative to a fixed body, a movable body that holds a lens for photographing, a fixed body that holds the movable body in a movable manner, and The driving magnet and the driving coil, and a metal member fixed to the driving magnet, the driving magnet is fixed to one of the movable body and the fixed body, and the driving coil is fixed to the movable body and the fixed body. The driving magnet and the driving coil are fixed to each other with a predetermined gap therebetween, and the driving magnet and the metal member are arranged between the driving magnet and the metal member. Are joined by a solder layer formed by melting and solidifying the solder foil or a tin layer formed by melting and solidifying the tin foil disposed between the driving magnet and the metal member It is characterized by that.

  In the optical device of the present invention, the drive magnet and the metal member are formed by melting and solidifying a solder foil disposed between the drive magnet and the metal member, or the drive magnet and Joined by a tin layer formed by melting and solidifying a tin foil disposed between the metal members. Therefore, in the present invention, it is possible to prevent the solder layer or the tin layer from protruding from between the joined driving magnet and the metal member. In the present invention, since the solder foil or tin foil disposed between the driving magnet and the metal member is melted and solidified, the surface of the driving magnet as in the optical device described in Patent Document 1 is used. It is not necessary to cover the whole with a tin plating layer. Furthermore, in the present invention, since the solder foil or tin foil disposed between the driving magnet and the metal member is melted and solidified, the solder particles and tin particles are formed on the surface of the driving magnet facing the driving coil. The risk of forming is reduced. Therefore, in the present invention, even when the gap between the driving magnet and the driving coil is narrowed, it is possible to prevent interference between the movable body side and the fixed body side. That is, according to the present invention, by narrowing the gap between the driving magnet and the driving coil, even when the apparatus is downsized, interference between the movable body side and the fixed body side is prevented, and the movable body is appropriately It becomes possible to move to.

  Moreover, in the present invention, unlike the optical device described in Patent Document 1, it is not necessary to form a tin plating layer on the driving magnet when manufacturing the driving magnet, and it is not necessary to cover the driving magnet with a mask. The manufacturing cost of the drive magnet can be reduced.

  In the present invention, the metal member is preferably formed by a punching process, and the sagging side surface of the metal member formed during the punching process is preferably joined to the driving magnet. If comprised in this way, it will become easy to fuse | melt and melt | dissolve solder or tin which flows into the clearance gap formed between the drooping part of a metal member, and a drive magnet. Therefore, it is possible to increase the bonding strength between the driving magnet and the metal member. Also, with this configuration, molten solder or tin does not flow easily on the surface of the drive magnet facing the drive coil, so solder particles or tin particles are formed on the surface of the drive magnet facing the drive coil. The risk of being reduced is further reduced.

  In this case, the metal member is preferably formed in a polygonal frame shape, and the driving magnet is preferably joined to a side portion of the metal member formed in a polygonal frame shape. If comprised in this way, it will become easy to fuse | melt and melt | dissolve solder or tin in the clearance gap between the drooping part formed in the both sides of the side part of a metal member, and a drive magnet. Accordingly, it is possible to further increase the bonding strength between the driving magnet and the metal member.

  In the present invention, for example, the movable body is swingably held by the fixed body so that the optical axis of the lens is tilted, and the drive magnet is formed in a substantially flat plate shape in a direction perpendicular to the optical axis direction of the lens. The magnetic pole on one side and the magnetic pole on the other side are magnetized so as to be different from each other and fixed to the movable body. The driving coil has a predetermined clearance from the side of the driving magnet in a direction perpendicular to the optical axis direction. The metal member is fixed to each of both end faces of the driving magnet in the optical axis direction, and the driving coil and the driving magnet are movable relative to the fixed body. Rock.

  The optical device of the present invention includes, for example, a sticking step of sticking a solder foil or tin foil to a metal member, and a joining step of joining a plurality of driving magnets and the metal member after the sticking step. Manufactured by. In this case, in the attaching step, the attaching operation of the solder foil or tin foil is facilitated as compared with the case where the solder foil or tin foil is attached to each of the plurality of driving magnets.

  In the present invention, a soldering foil or a tin foil is attached to two metal members in the attaching step, and a plurality of driving magnets are sandwiched between the two metal members in the optical axis direction in the joining step. It is preferable to join the driving magnet and two metal members. If comprised in this way, in a joining process, two metal members in the state which sandwiched a plurality of drive magnets will be pressurized and heated from the both sides of an optical axis direction, and a plurality of drive magnets and two metal members will be heated Can be fixed at once.

  In this invention, it is preferable to affix a solder foil or tin foil to a metal member with the flux which has viscosity at a sticking process. If comprised in this way, it will become easy for the molten solder or tin to spread between a drive magnet and a metal member in a joining process. Therefore, it is possible to form a uniform solder layer or tin layer between the driving magnet and the metal member, and as a result, it is possible to increase the bonding strength between the driving magnet and the metal member.

  As described above, according to the present invention, an optical device including a movable body that holds a lens for photographing and a fixed body that movably holds the movable body can be moved even when the device is downsized. It becomes possible to move the body appropriately. In the optical device of the present invention, the manufacturing cost of the driving magnet can be reduced. In addition, in the method for manufacturing an optical device according to the present invention, it is easy to apply a solder foil or tin foil to a metal member.

1 is a perspective view of an optical device according to an embodiment of the present invention. It is sectional drawing of the EE cross section of FIG. FIG. 3 is an exploded perspective view of a driving coil, a driving magnet, a magnet coupling member, and the like shown in FIG. FIG. 4 is a perspective view of a state where a magnet coupling member is fixed to the drive magnet shown in FIG. 3. It is a side view of the magnet for a drive shown in FIG. 4, and a magnet connection member. FIG. 3 is a diagram showing a case body, a driving coil, a driving magnet, a magnet coupling member, and the like shown in FIG. It is a figure for demonstrating the joining method of the magnet for a drive shown in FIG. 3, and a magnet connection member. It is a figure for demonstrating the effect of the optical apparatus shown in FIG. It is a perspective view of the optical apparatus concerning other embodiment of this invention. It is sectional drawing of the GG cross section of FIG. FIG. 10 is a perspective view of a state in which a driving magnet is fixed to the cover member shown in FIG. 9.

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

(Configuration of optical device)
FIG. 1 is a perspective view of an optical device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the driving coil 17, the driving magnet 18, and the magnet coupling members 24 and 25 shown in FIG. FIG. 4 is a perspective view showing a state in which the magnet coupling members 24 and 25 are fixed to the driving magnet 18 shown in FIG. FIG. 5 is a side view of the drive magnet 18 and the magnet coupling members 24 and 25 shown in FIG. FIG. 6 is a diagram showing the case body 12, the driving coil 17, the driving magnet 18, the magnet coupling member 24, and the like shown in FIG. In the following description, as shown in FIG. 1 and the like, the three directions orthogonal to each other are defined as the X direction, the Y direction, and the Z direction, the X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. And The Z1 direction side is the “upper” side, and the Z2 direction side is the “lower” side.

  The optical device 1 of this embodiment is a small and thin camera mounted on a portable device such as a mobile phone, a drive recorder, a surveillance camera system, or the like, and has an autofocus function and a shake correction function. The optical device 1 is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the optical device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. Is substantially parallel to the left-right direction or the front-rear direction.

  As shown in FIGS. 1 and 2, the optical device 1 includes a camera module 2 as a movable body that holds a lens and an image sensor, and a fixed body that holds the camera module 2 so that the optical axis L is tiltable. 3, a leaf spring 4 that connects the camera module 2 and the fixed body 3, and a swing that swings the camera module 2 with respect to the fixed body 3 in order to correct a shake of an optical image formed on the image sensor. And a drive mechanism 5. In this embodiment, the vertical direction substantially coincides with the optical axis direction of the camera module 2 when the camera module 2 is not swinging. In the present embodiment, an image sensor is mounted on the lower end of the camera module 2, and a subject placed on the upper side is photographed. That is, in this embodiment, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the anti-subject side (imaging element side, image side).

  The camera module 2 is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the camera module 2 is formed so that the shape when viewed from the optical axis direction is substantially square. The camera module 2 includes a movable body that holds a lens and can move in the optical axis direction, a holding body that holds the movable body so as to move in the optical axis direction, and the movable body in the optical axis direction with respect to the holding body. And a lens driving mechanism for driving. The lens driving mechanism is configured by, for example, a driving coil fixed to the movable body and a driving magnet fixed to the holding body. The lens driving mechanism may be constituted by a piezoelectric element or a shape memory alloy.

  A substrate 7 is fixed to the lower surface of the camera module 2. An image sensor is mounted on the substrate 7. Further, for example, a gyroscope for detecting a change in the tilt of the camera module 2 is mounted on the substrate 7. An FPC (flexible printed circuit board) 8 is connected to the substrate 7, and the FPC 8 is drawn on the lower end side of the optical device 1 and pulled out from the side surface of the optical device 1. Further, as shown in FIG. 2, an abutting plate 9 with which a later-described spherical member 14 abuts is fixed to the lower surface of the substrate 7.

  The fixed body 3 includes a case body 12 that forms four front and rear, left and right side surfaces (outer peripheral surfaces) of the optical device 1, and a lower case body 13 that forms the lower surface side of the optical device 1. The case body 12 is formed in a substantially rectangular tube shape, and is disposed so as to surround the camera module 2 from the outer peripheral side. The lower case body 13 is formed in a substantially square cylindrical shape with a bottom (substantially bottomed rectangular cylindrical shape) having a bottom portion 13a and a cylindrical portion 13b.

  The bottom portion 13 a of the lower case body 13 is disposed on the lower side and constitutes the lower surface of the optical device 1. In addition, an arrangement hole 13c in which the lower end side of the spherical member 14 serving as a fulcrum of the camera module 2 is disposed is formed at the center of the bottom portion 13a. In the present embodiment, the spherical member 14 and the arrangement hole 13c constitute a fulcrum portion 15 serving as a swing center of the camera module 2. The fulcrum portion 15 is disposed below the camera module 2, and the upper end of the spherical member 14 is in contact with the lower surface of the contact plate 9.

  The swing drive mechanism 5 includes four drive coils 17 and four drive magnets 18 disposed to face the four drive coils 17 respectively.

  The four driving coils 17 are pattern coils formed on the FPC 19 itself, as shown in FIG. Further, the drive coil 17 is formed by being wound in a substantially rectangular shape, and includes two long side portions that are substantially parallel to each other. The FPC 19 is arranged along the inner peripheral surface of the case body 12 such that each of the four drive coils 17 is arranged on each of the four inner surfaces constituting the inner peripheral surface of the case body 12. Yes. The FPC 19 is connected to the FPC 8 via the relay FPC 20. The drive coil 17 may be an air core coil wound in an air core shape. In this case, the driving coil 17 may be fixed to each of the four inner surfaces of the case body 12, or the four driving coils 17 may be mounted on the FPC 19.

  The driving magnet 18 is a neodymium magnet mainly composed of neodymium, iron, and boron. The driving magnet 18 is formed in a substantially rectangular flat plate shape. The driving magnet 18 is composed of two magnet pieces, a magnet piece 22 and a magnet piece 23, which are formed in a substantially rectangular flat plate shape. Specifically, the magnet 18 for driving is formed by the magnet piece 22 and the magnet piece 23 being bonded and fixed to each other in a state where the lower surface of the magnet piece 22 and the upper surface of the magnet piece 23 are in contact with each other. On the surface of the driving magnet 18, a nickel alloy mainly composed of nickel or a nickel plating layer made of nickel is formed.

  A magnet connecting member 24 formed in a substantially square frame shape is fixed to the upper end surfaces of the four drive magnets 18, and formed in a substantially square frame shape on the lower end surfaces of the four drive magnets 18. The magnet connecting member 25 is fixed. The magnet connecting members 24 and 25 are formed of a thin steel plate such as a stainless steel plate. Moreover, the magnet connection members 24 and 25 are formed by press punching. On the surfaces of the magnet coupling members 24 and 25, a nickel alloy mainly composed of nickel or a nickel plating layer made of nickel is formed.

  On the upper end surfaces of the four drive magnets 18, the sagging side surface of the magnet connecting member 24 formed at the time of punching is fixed. Further, the sag side surface of the magnet connecting member 25 formed at the time of punching is fixed to the lower end surfaces of the four drive magnets 18. As shown in FIG. 4, each of the four drive magnets 18 is joined to each of the four side portions of the magnet coupling members 24 and 25 formed in a substantially square frame shape. The width of the driving magnet 18 in the front-rear direction or the left-right direction is shorter than the length of the side portions of the magnet coupling members 24, 25.

  In this embodiment, the drive magnet 18 and the magnet coupling member 24 are joined by a tin layer 26 made of a tin-based metal containing at least tin. Similarly, the drive magnet 18 and the magnet coupling member 25 are joined by a tin layer 27 made of a tin-based metal containing at least tin. That is, as shown in FIGS. 2 and 5, the magnet coupling member 24 and the driving magnet 18 are joined by the tin layer 26 disposed between the lower surface of the magnet coupling member 24 and the upper surface of the driving magnet 18. The magnet connecting member 25 and the driving magnet 18 are joined by the tin layer 27 disposed between the upper surface of the magnet connecting member 25 and the lower surface of the driving magnet 18. The tin layers 26 and 27 are made of tin, a tin alloy containing copper, a tin alloy containing gold, a tin alloy containing silver, a tin alloy containing bismuth, or the like. The magnet coupling members 24 and 25 of this embodiment are metal members fixed to the driving magnet 18.

  The four drive magnets 18 are fixed to each of the four outer surfaces constituting the outer peripheral surface of the camera module 2, and are arranged on the inner peripheral side of the case body 12 with respect to the drive coil 17. In this embodiment, after the four driving magnets 18 and the magnet connecting members 24 and 25 are joined and the four driving magnets 18 are connected by the magnet connecting members 24 and 25, the outer surface of the camera module 2. The four drive magnets 18 are fixed to each other.

  The magnet piece 22 is magnetized so that the magnetic pole formed on one side and the magnetic pole formed on the other side are different. In other words, the magnet pieces 22 are formed so that the magnetic poles formed on the front and rear inner surfaces fixed to the camera module 2 and the front and rear outer surfaces facing the driving coil 17 are different from each other. Is magnetized. Similarly, the magnet piece 23 is a magnetic pole in which the magnetic poles formed on the front and rear inner surfaces fixed to the camera module 2 are different from the magnetic poles formed on the front and rear outer surfaces facing the driving coil 17. Is so magnetized. The magnet pieces 22 and 23 are magnetized so that the magnetic poles on the inner surface of the magnet piece 22 and the magnetic poles on the inner surface of the magnet piece 23 are different from each other. That is, the magnet pieces 22 and 23 are magnetized so that the magnetic poles on the outer surface of the magnet piece 22 are different from the magnetic poles on the outer surface of the magnet piece 23.

  As described above, the driving coil 17 is disposed along the inner peripheral surface of the case body 12, and as shown in FIG. 6, the driving magnet 18 fixed to the outer surface of the camera module 2, and the case It is arranged in a gap with the inner peripheral surface of the body 12. That is, the drive coil 17 is opposed to the drive magnet 18 with a predetermined gap in the front-rear direction or the left-right direction. The driving coil 17 is also opposed to the tin layers 26 and 27 via a predetermined gap in the front-rear direction or the left-right direction (see FIG. 2).

  The leaf spring 4 includes a movable side fixed portion fixed to the magnet coupling member 25, a fixed side fixed portion fixed to the fixed body 3, and a plurality of spring portions connecting the movable side fixed portion and the fixed side fixed portion. I have. In this embodiment, the spring part is bent with respect to the fixed side fixing part, so that the camera module 2 fixed to the movable side fixing part via the magnet coupling member 25 and the driving magnet 18 can be swung. It has become. Further, the leaf spring 4 ensures that the upper end of the spherical member 14 and the contact plate 9 are in contact with each other, and the lower end side of the spherical member 14 and the edge of the arrangement hole 13c of the lower case body 13 are in contact with each other. Therefore, it is fixed in a bent state so that a pressurizing force is generated (that is, an urging force for urging the camera module 2 downward is generated).

  In the optical device 1 configured as described above, when a change in the tilt of the camera module 2 is detected by the gyroscope mounted on the substrate 7, a current is supplied to the driving coil 17 based on the detection result of the gyroscope. Is supplied. When a current is supplied to the driving coil 17, the camera module 2 swings with the fulcrum 15 as the center and the left and right direction and / or the front and rear direction as the axial direction so as to tilt the optical axis L, thereby correcting the shake. Is done.

(Join method of driving magnet and magnet connecting member)
FIG. 7 is a view for explaining a method of joining the driving magnet 18 and the magnet coupling members 24 and 25 shown in FIG.

  In the manufacturing process of the optical device 1, the driving magnet 18 and the magnet coupling members 24 and 25 are joined as follows. That is, first, the tin foil 30 that becomes the tin layers 26 and 27 after bonding is bonded to one surface of the magnet coupling members 24 and 25 before being bonded to the driving magnet 18 (sticking step). In the attaching step, the tin foil 30 is attached to the sagging side surfaces of the magnet connecting members 24 and 25. Specifically, in the pasting step, a viscous flux is applied to the sagging side surfaces of the magnet connecting members 24 and 25, and the tin foil 30 is applied to the sagging side surfaces of the magnet connecting members 24 and 25 by the applied flux. paste.

  Further, in the pasting step, after the sheet-shaped tin foil 30 larger than the magnet connecting members 24 and 25 is attached to the magnet connecting members 24 and 25, the punching process or the cutting process using the blade, Unnecessary portions of the tin foil 30 (that is, portions of the tin foil 30 that are not attached to the magnet coupling members 24 and 25) are removed. Therefore, the tin foil 30 is affixed to the whole surface of the magnet coupling members 24 and 25 on the sag side after the affixing step. In the pasting step, tin foil 30 that has been cut in the same shape as the magnet connecting members 24 and 25 (that is, cut into a substantially square frame shape) may be pasted on the magnet connecting members 24 and 25 in advance. .

  Further, four driving magnets 18 are arranged and aligned on a predetermined jig. Thereafter, the magnet connecting members 24 and 25 and the driving magnet 18 are joined (joining step). In the joining step, first, the magnet connecting member 25 is inverted, and the surface of the magnet connecting member 25 on which the tin foil 30 is attached is placed above the end faces of the four drive magnets 18 aligned in the jig. In a state of being in contact with each other, the heater chip is pressed against the magnet coupling member 25 from the upper side to pressurize and heat the magnet coupling member 25, and then the heater chip is removed. Then, the tin foil 30 is melted by the heat of the heater chip, and then the melted tin is solidified to form the tin layer 27, and the four driving magnets 18 are joined to the magnet coupling member 25.

  Thereafter, the magnet connecting member 25 and the four driving magnets 18 joined to the magnet connecting member 25 are reversed, and the surface of the magnet connecting member 24 on which the tin foil 30 is attached is placed on the four driving magnets 18. In a state where it is in contact with the end face of the magnet from above, a heater chip is pressed against the magnet connecting member 24 from above to pressurize and heat the magnet connecting member 24, and then the heater chip is removed. Then, the tin foil 30 is melted by the heat of the heater chip, and then the melted tin is solidified to form the tin layer 26, and the four driving magnets 18 are joined to the magnet connecting member 24.

  Thus, in this embodiment, the magnet coupling member 24 is formed by the tin layers 26 and 27 formed by melting and solidifying the tin foil 30 disposed between the magnet coupling members 24 and 25 and the driving magnet 18. 25 and the drive magnet 18 are joined.

(Main effects of this form)
As described above, in this embodiment, the magnet coupling is performed by the tin layers 26 and 27 formed by melting and solidifying the tin foil 30 disposed between the magnet coupling members 24 and 25 and the driving magnet 18. The members 24 and 25 and the driving magnet 18 are joined. Therefore, in this embodiment, it is possible to prevent the tin layers 26 and 27 from protruding from between the joined magnet coupling members 24 and 25 and the driving magnet 18. In this embodiment, since the tin foil 30 disposed between the magnet coupling members 24 and 25 and the driving magnet 18 is melted and solidified, the driving magnet as in the optical device described in Patent Document 1. It is not necessary to cover the entire surface of 18 with a tin plating layer. Furthermore, in this embodiment, since the tin foil 30 disposed between the magnet coupling members 24 and 25 and the driving magnet 18 is melted and solidified, the surface of the driving magnet 18 facing the driving coil 17 ( That is, the possibility that tin grains are formed on the front, rear, left and right outer surfaces of the drive magnet 18 is reduced. Therefore, in this embodiment, even when the gap between the driving magnet 18 and the driving coil 17 is narrowed, it is possible to prevent interference between the camera module 2 side and the fixed body 3 side. That is, in this embodiment, even if the optical device 1 is downsized by narrowing the gap between the driving magnet 18 and the driving coil 17, interference between the camera module 2 side and the fixed body 3 side is prevented. Thus, the camera module 2 can be appropriately swung.

  In the present embodiment, unlike the optical device described in Patent Document 1, it is not necessary to form a tin plating layer on the driving magnet 18 when the driving magnet 18 is manufactured, and the surface of the driving magnet 18 is a magnet connecting member. It is not necessary to cover with a mask so as to remove the joint surface between the drive magnets 24 and 25 and the drive magnet 18. Therefore, in this embodiment, the manufacturing cost of the driving magnet 18 can be reduced.

  In this embodiment, the sagging side surfaces of the magnet coupling members 24 and 25 are joined to the driving magnet 18. Therefore, in this embodiment, as shown in FIGS. 8A and 8B, molten tin is formed in a gap formed between the sag portions 24 a and 25 a of the magnet coupling members 24 and 25 and the driving magnet 18. The tin of the foil 30 flows and becomes easy to solidify. Therefore, in this embodiment, it is possible to increase the bonding strength between the magnet coupling members 24 and 25 and the driving magnet 18.

  In particular, in the present embodiment, each of the four drive magnets 18 is joined to each of the four side portions of the magnet connection members 24 and 25 formed in a substantially square frame shape. The melted tin flows into the gaps between the sagging portions 24a, 25a formed on both sides of the side portions 25 and the driving magnet 18 and solidifies easily. Therefore, in this embodiment, it is possible to further increase the bonding strength between the magnet connecting members 24 and 25 and the driving magnet 18. Further, in this embodiment, since the tin foil 30 is attached to the entire surface of the magnet coupling members 24 and 25 on the sag side, a fillet is formed on the joint surface between the magnet coupling members 24 and 25 and the driving magnet 18. It becomes easy to be done. Therefore, in this embodiment, it is possible to further increase the bonding strength between the magnet connecting members 24 and 25 and the driving magnet 18.

  Further, as shown in FIG. 8C, when the surface of the magnet coupling members 24, 25 on the burrs side is joined to the drive magnet 18, the melted tin foil 30 tin is used as the drive magnet 18. It flows out and solidifies on the front, back, left and right side surfaces, and there is a high possibility that the granular tin particles 31 adhere to the front, back, left and right side surfaces of the drive magnet 18. That is, when the burrs side surfaces of the magnet coupling members 24 and 25 are joined to the driving magnet 18, there is a possibility that tin particles 31 may be formed on the surface of the driving magnet 18 facing the driving coil 17. Get higher. On the other hand, in this embodiment, since the molten tin flows into the gap between the sagging portions 24a and 25a and the driving magnet 18 and is easily solidified, the surface of the driving magnet 18 facing the driving coil 17 The risk of forming tin particles 31 on the surface is further reduced.

  In this embodiment, the tin foil 30 is affixed to the magnet coupling members 24 and 25 in the affixing step. Therefore, in this embodiment, in the attaching step, the attaching operation of the tin foil 30 is facilitated as compared with the case where the tin foil is attached to each of the four drive magnets 18.

  In this embodiment, in the attaching step, a viscous flux is applied to the magnet connecting members 24 and 25, and the tin foil 30 is attached to the magnet connecting members 24 and 25 by the applied flux. Therefore, in this embodiment, in the joining step, the melted tin is likely to spread between the magnet coupling members 24 and 25 and the driving magnet 18. Therefore, in this embodiment, it is possible to form uniform tin layers 26 and 27 between the magnet coupling members 24 and 25 and the driving magnet 18, and as a result, the magnet coupling members 24 and 25 and the driving magnet are formed. It is possible to increase the bonding strength with the 18.

(Modification of optical device)
FIG. 9 is a perspective view of an optical device 51 according to another embodiment of the present invention. 10 is a cross-sectional view taken along the line GG in FIG. FIG. 11 is a perspective view of a state in which the driving magnet 63 is fixed to the cover member 60 shown in FIG.

  In the above-described embodiment, the optical device 1 is a camera having an autofocus function and a shake correction function. However, the optical device to which the present invention is applied moves a photographing lens in the optical axis direction to generate an optical image. The lens driving device 51 having a configuration for adjusting the focal position may be used. The lens driving device 51 is mounted and used in a relatively small camera used in a mobile phone, a drive recorder, a surveillance camera system, or the like. Hereinafter, the configuration of the lens driving device 51 will be described.

  The lens driving device 51 is formed in a flat, substantially quadrangular prism shape whose shape when viewed from the direction of the optical axis L (optical axis direction) of the photographing lens is a substantially square shape. As shown in FIGS. 9 and 10, the lens driving device 51 holds a photographing lens and can move a movable body 52 in the optical axis direction, and a fixed body that holds the movable body 52 so as to be movable in the optical axis direction. A body 53 and a drive mechanism 54 for driving the movable body 52 in the optical axis direction are provided. The movable body 52 is movably held by the fixed body 53 via a leaf spring (not shown). In the following description, the X direction is the left-right direction, the Y direction is the front-rear direction, the Z direction is the up-down direction, the Z1 direction side is the “upper” side, and the Z2 direction side is the “lower” as in the above-described embodiment. ”Side. The Z direction (vertical direction) substantially coincides with the optical axis direction, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the opposite subject side (imaging element side). , Image side).

  The movable body 52 includes a sleeve 58 that holds a lens holder 57 to which a plurality of lenses are fixed. The lens holder 57 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed to the inner peripheral side of the lens holder 57. The sleeve 58 is formed in a substantially cylindrical shape, and the outer peripheral surface of the lens holder 57 is fixed to the inner peripheral surface of the sleeve 58. Further, a flange portion 58 a is formed on the lower end side of the sleeve 58.

  The fixed body 53 includes a cover member 60 that forms four side surfaces of the lens driving device 51 and a base member 61 that forms an end surface of the lens driving device 51 on the side opposite to the subject. The cover member 60 is made of a magnetic thin steel plate. A nickel plating layer is formed on the surface of the cover member 60. The cover member 60 is formed in a substantially rectangular tube shape with a bottom having a bottom portion 60a and a tube portion 60b. The bottom 60a constitutes the subject side end face of the lens driving device 51. A circular through hole 60c is formed at the center of the bottom 60a. The cover member 60 is disposed so as to surround the outer peripheral side of the drive mechanism 54 and the movable body 52. The base member 61 is formed in a substantially square frame shape, and is attached to the lower end side of the cover member 60.

  The drive mechanism 54 includes four drive magnets 63 that are substantially triangular prisms arranged at the four corners of the lens drive device 51, and one drive coil 64 that is fixed to the sleeve 58. The driving magnet 63 is a neodymium magnet mainly composed of neodymium, iron, and boron. The driving magnet 63 is formed so that its shape when viewed from above and below is a substantially right-angled isosceles triangle. A nickel plating layer is formed on the surface of the driving magnet 63.

  The four drive magnets 63 are fixed to the bottom 60 a of the cover member 60. Specifically, the upper end surfaces of the four drive magnets 63 are fixed to the lower surface of the bottom portion 60a in a state where they are in contact with the lower surface of the bottom portion 60a. The driving magnet 63 is joined to the bottom 60a by a tin layer 65 made of a tin-based metal. That is, as shown in FIG. 11, the driving magnet 63 and the bottom portion 60 a are joined by the tin layer 65 disposed between the lower surface of the bottom portion 60 a and the upper surface of the driving magnet 63.

  A flat magnetic member 67 made of a magnetic material is fixed to the lower end surface of the drive magnet 63. The magnetic member 67 of this embodiment is formed of a stainless steel plate having magnetism. A nickel plating layer is formed on the surface of the magnetic member 67. The magnetic member 67 is formed so that its shape when viewed from above and below is a substantially right isosceles triangular shape similar to that of the drive magnet 63. The magnetic member 67 is joined to the driving magnet 63 by a tin layer 68 made of a tin-based metal. That is, as shown in FIG. 10, the driving magnet 63 and the magnetic member 67 are joined by the tin layer 68 disposed between the lower surface of the driving magnet 63 and the upper surface of the magnetic member 67. The cover member 60 and the magnetic member 67 are metal members fixed to the driving magnet 63.

  The driving magnet 63 is magnetized into two poles in the vertical direction so that the magnetic pole on the upper end surface is different from the magnetic pole on the lower end surface. In the lens driving device 51, as shown in FIG. A magnetic field F is formed that passes through the cylindrical portion 60b, the bottom portion 60a, the driving magnet 63, and the magnetic member 67, and wraps around from the lower surface of the magnetic member 67 toward the inner peripheral surface of the cylindrical portion 60b.

  The driving coil 64 is wound in a flat and substantially rectangular tube shape so that the shape when viewed from the vertical direction is a substantially square shape. The driving coil 64 is fixed to the upper surface of the flange portion 58 a of the sleeve 58. The driving coil 64 is arranged along the inner peripheral surface of the cylindrical portion 60b of the cover member 60. The four corners of the driving coil 64 and the vicinity thereof are the driving magnet 63, the magnetic member 67, and the cover member. It arrange | positions in the clearance gap between 60 cylinder parts 60b. In other words, the four corners of the driving coil 64 and the inner peripheral surface of the vicinity thereof are opposed to the driving magnet 63 and the magnetic member 67 with a predetermined gap in the front-rear direction or the left-right direction.

  In the lens driving device 51, the cover member 60, the magnetic member 67, and the driving magnet 63 are joined as follows. That is, first, a tin foil that becomes the tin layer 65 after bonding is attached to the bottom 60a of the cover member 60 and / or the driving magnet 63 before bonding, and the driving magnet 63 and / or the magnetic member 67 before bonding. Then, a tin foil that becomes the tin layer 68 after bonding is pasted (affixing step). In the pasting step, tin foil is pasted with an adhesive flux as in the above-described form. Thereafter, similarly to the above-described embodiment, the cover member 60 and the magnetic member 67 and the driving magnet 63 are joined using a heater chip (joining step). Thus, also in the lens driving device 51, the tin foil disposed between the cover member 60 and the driving magnet 63 and the tin foil disposed between the magnetic member 67 and the driving magnet 63 are melted. The cover member 60 and the magnetic member 67 and the driving magnet 63 are joined by the tin layers 65 and 68 formed by solidification.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the above-described embodiment, the magnet coupling members 24 and 25 are formed by the tin layers 26 and 27 formed by melting and solidifying the tin foil 30 disposed between the magnet coupling members 24 and 25 and the driving magnet 18. The drive magnet 18 is joined. In addition, for example, the magnet coupling members 24 and 25 and the driving magnet are formed by a solder layer formed by melting and solidifying a solder foil disposed between the magnet coupling members 24 and 25 and the driving magnet 18. 18 may be joined. Similarly, in the above-described modification, the tin foil disposed between the cover member 60 and the driving magnet 63 and the tin foil disposed between the magnetic member 67 and the driving magnet 63 are melted and solidified. The cover member 60 and the magnetic member 67 and the driving magnet 63 are joined to each other by the tin layers 65 and 68 formed by the solder layer, and the solder foil disposed between the cover member 60 and the driving magnet 63. The cover member 60, the magnetic member 67, and the driving magnet 63 are joined by a solder layer formed by melting and solidifying the solder foil disposed between the magnetic member 67 and the driving magnet 63. May be. However, since the tin foil can be formed thinner than the solder foil, it is preferable to use the tin foil in order to reduce the size of the optical device 1 and the lens driving device 51.

  In the embodiment described above, the tin foil 30 that becomes the tin layers 26 and 27 after bonding is attached to one surface of the magnet coupling members 24 and 25 before being bonded to the driving magnet 18. In addition to this, for example, instead of the tin foil 30 attached to one surface of the magnet connecting members 24, 25, or in addition to the tin foil 30 attached to one surface of the magnet connecting members 24, 25, Tin foil may be affixed to both end faces of the drive magnet 18 before being joined to the magnet coupling members 24 and 25. Moreover, in the form mentioned above, although the tin foil 30 is affixed on the magnet connection members 24 and 25, without connecting the tin foil 30 to the magnet connection members 24 and 25, the magnet connection members 24 and 25 and the drive magnets. The magnet coupling members 24 and 25 and the driving magnet 18 may be joined by pressing a heater chip against the magnet coupling members 24 and 25 in a state where the tin foil 30 is sandwiched between the magnet coupling members 24 and 25.

  In the embodiment described above, after the four driving magnets 18 and the magnet coupling member 25 are joined in the joining step, the four driving magnets 18 and the magnet coupling member 24 are joined. In addition, for example, in the joining step, a heater chip is attached to the magnet connecting member 24 and the magnet connecting member 25 in a state where the four driving magnets 18 are sandwiched between the magnet connecting member 24 and the magnet connecting member 25. The magnet connecting members 24 and 25 and the four driving magnets 18 may be joined by pressing, heating, and then removing the heater chip. In this case, since the magnet coupling members 24 and 25 and the driving magnet 18 can be joined in a single operation, the time for joining the magnet coupling members 24 and 25 and the driving magnet 18 is shortened. .

  In the embodiment described above, the magnet coupling members 24 and 25 and the driving magnet 18 are joined using a heater chip. In addition, for example, the magnet coupling members 24 and 25 and the driving magnet 18 may be joined by induction heating. Further, the magnet coupling members 24 and 25 and the drive magnet 18 may be joined by ultrasonic bonding, or the tin coupling 30 may be irradiated with a laser so that the magnet coupling members 24 and 25 and the drive magnet 18 May be joined.

  In the embodiment described above, the sagging side surfaces of the magnet connecting members 24 and 25 are joined to the driving magnet 18, but the burrs side surfaces of the magnet connecting members 24 and 25 may be joined to the driving magnet 18. . In the above-described embodiment, the magnet connecting member 24 and the magnet connecting member 25 are fixed to the driving magnet 18. However, only one of the magnet connecting member 24 or the magnet connecting member 25 is fixed to the driving magnet 18. good. In the above-described embodiment, the optical device 1 has an autofocus function, but the optical device 1 may not have an autofocus function. That is, the camera module 2 may not include a lens driving mechanism.

  In the embodiment described above, the optical device 1 is formed so that the shape when viewed from the optical axis direction is substantially square. In addition, for example, the optical device 1 may be formed so that the shape when viewed from the optical axis direction is substantially rectangular, or the shape when viewed from the optical axis direction is substantially hexagonal or substantially It may be formed to have a polygonal shape such as an octagonal shape. When the optical device 1 is formed so that the shape when viewed from the optical axis direction is a polygonal shape, the magnet coupling members 24 and 25 are formed in a polygonal frame shape corresponding to the outer shape of the optical device 1. .

1 Optical device 2 Camera module (movable body)
3, 53 Fixed body 17, 64 Driving coil 18, 63 Driving magnet 24, 25 Magnet connecting member (metal member)
26, 27, 65, 68 Tin layer 30 Tin foil 51 Lens driving device (optical device)
52 Movable body 60 Cover member (metal member)
67 Magnetic member (metal member)
L Optical axis Z Optical axis direction

Claims (7)

A movable body that holds a lens for photographing, a fixed body that movably holds the movable body, a drive magnet and a drive coil for moving the movable body relative to the fixed body, and the drive A metal member fixed to the magnet for use,
The driving magnet is fixed to one of the movable body and the fixed body,
The driving coil is fixed to one of the movable body and the fixed body,
The driving magnet and the driving coil are disposed to face each other with a predetermined gap therebetween.
The drive magnet and the metal member are a solder layer formed by melting and solidifying a solder foil disposed between the drive magnet and the metal member, or the drive magnet and the metal An optical device characterized by being joined by a tin layer formed by melting and solidifying a tin foil disposed between members. The metal member is formed by press punching,
The optical device according to claim 1, wherein a sag side surface of the metal member formed at the time of the punching is joined to the driving magnet. The metal member is formed in a polygonal frame shape,
The optical device according to claim 2, wherein the driving magnet is joined to a side portion of the metal member formed in a polygonal frame shape. The movable body is swingably held by the fixed body so that the optical axis of the lens is inclined,
The driving magnet is formed in a substantially flat plate shape, and is magnetized so that a magnetic pole on one side surface and a magnetic pole on the other side surface in a direction orthogonal to the optical axis direction of the lens are different from each other, and on the movable body Fixed,
The drive coil is fixed to the fixed body so as to face a side surface of the drive magnet via a predetermined gap in a direction orthogonal to the optical axis direction,
The metal member is fixed to each of both end faces of the driving magnet in the optical axis direction,
The optical device according to claim 1, wherein the driving coil and the driving magnet swing the movable body with respect to the fixed body. A method for manufacturing an optical device according to any one of claims 1 to 4,
An attaching step of attaching the solder foil or the tin foil to the metal member;
An optical device manufacturing method comprising: a joining step of joining a plurality of the driving magnets and the metal member after the pasting step. In the attaching step, the solder foil or the tin foil is attached to the two metal members,
In the joining step, the plurality of driving magnets and the two metal members are joined in a state where the plurality of driving magnets are sandwiched between the two metal members in the optical axis direction. A method for manufacturing an optical device according to claim 5.   7. The method of manufacturing an optical device according to claim 5, wherein, in the attaching step, the solder foil or the tin foil is attached to the metal member with a viscous flux.

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