JP5939839B2 - Optical device - Google Patents

Description

  The present invention relates to a small optical device mounted on a mobile phone or the like.

  In recent years, mobile devices such as mobile phones have been equipped with optical devices for photographing. In the case of a mobile device, camera shake tends to occur during shooting. Therefore, conventionally, an optical apparatus capable of correcting camera shake during photographing has been proposed (see, for example, Patent Document 1). An optical device described in Patent Document 1 is a movable module on which a lens and an image sensor are mounted, a fixed body that supports the movable module, and a shake correction unit that corrects camera shake by swinging the movable module with respect to the fixed body. Drive mechanism.

  In the optical device described in Patent Document 1, the fixed body includes a substantially square cylindrical upper cover that covers the outer peripheral side of the movable module and the shake correction drive mechanism. The shake correction drive mechanism includes four drive magnets fixed to the outer peripheral surface of the movable module formed in a substantially quadrangular prism shape, and four coil portions arranged to face each of the four drive magnets. The sheet-like coil which has integrally. The sheet-like coil is formed in an elongated strip shape, and is bent so as to be along the inner peripheral surface of the upper cover, for example, an adhesive filled between the inner peripheral surface of the upper cover and the sheet-like coil. Is fixed to the inner peripheral surface of the upper cover. That is, the sheet-like coil is fixed along the inner peripheral surface of the upper cover by an adhesive filled between the inner peripheral surface of the upper cover and the sheet-like coil.

  Therefore, in the optical device described in Patent Document 1, the shape of the sheet-like coil disposed along the inner peripheral surface of the upper cover by the adhesive filled between the inner peripheral surface of the upper cover and the sheet-like coil. Can be maintained. Therefore, in this optical device, it is possible to provide an appropriate gap between the driving magnet and the coil portion, and as a result, it is possible to stabilize the driving force of the shake correction driving mechanism.

JP2011-257555A

  However, in the optical device described in Patent Document 1, if the amount of adhesive filled between the inner peripheral surface of the upper cover and the sheet-like coil is small, the sheet-like coil is reliably attached to the inner peripheral surface of the upper cover. There is a possibility that it cannot be fixed and the shape of the sheet-like coil arranged along the inner peripheral surface of the upper cover cannot be maintained. As a result, in this optical device, an appropriate gap cannot be provided between the driving magnet and the coil portion, and the driving force of the shake correction driving mechanism may become unstable.

  On the other hand, if the amount of adhesive filled between the inner peripheral surface of the upper cover and the sheet-like coil is increased, the sheet-like coil is securely fixed to the inner peripheral surface of the upper cover, and the inner It becomes possible to maintain the shape of the sheet-like coil arranged along the plane. However, if the amount of the adhesive is too large, the adhesive adheres to a predetermined jig for maintaining the shape of the sheet coil before being bonded and fixed to the inner peripheral surface of the upper cover, and the sheet is attached to the jig. There is a risk that the coil will be fixed. Therefore, in the optical device described in Patent Document 1, the amount of adhesive filled between the inner peripheral surface of the upper cover and the sheet coil must be strictly controlled, and the manufacturing process of the optical device is complicated. become.

  Accordingly, an object of the present invention is to provide an optical device capable of stabilizing the driving force of the driving mechanism while maintaining the shape of the sheet-like coil arranged along the inner peripheral surface of the case body relatively easily. It is to provide.

In order to solve the above-described problems, an optical device of the present invention includes a movable part having a photographing lens, a holding part that holds the movable part in a movable manner, and a drive mechanism that drives the movable part. Is provided with a plurality of driving magnets attached to the outer peripheral surface of the movable part, and a strip-shaped sheet-like coil integrally having a plurality of coil parts arranged to face each of the plurality of driving magnets, Provided with a substantially square cylindrical case body that covers the outer peripheral side of the drive magnet and the sheet-like coil, the longitudinal ends of the sheet-like coil are connected to each other at both longitudinal ends of the sheet-like coil formed in a strip shape. A solder land for soldering is formed, and the sheet-like coil is bent at substantially right angles at four points in the longitudinal direction of the sheet-like coil, and the end portions in the longitudinal direction of the sheet-like coil are substantially square cylindrical cases. 4 of the body In the state of being formed into a substantially square tube shape by being soldered in one of the aspects, it is fixed to the inner peripheral surface of the case body, the solder land, the sheet-shaped coil, the inner periphery of the case body A notch portion is formed in a portion of the case body corresponding to the solder land, which is formed on the surface facing the surface .

  In the optical device of the present invention, the solder lands for soldering the longitudinal ends of the sheet-like coil to each other are formed at both ends in the longitudinal direction of the sheet-like coil. The end portions in the direction are fixed to the inner peripheral surface of the case body in a state where the end portions are soldered. Therefore, in the present invention, it is possible to maintain the shape of the sheet-like coil fixed to the inner peripheral surface of the case body by solder bonding using the solder land. That is, in the present invention, it is possible to maintain the shape of the sheet-like coil arranged along the inner peripheral surface of the case body relatively easily by solder bonding using the solder land, and as a result, the drive It is possible to secure an appropriate gap between the magnet for use and the coil portion and stabilize the driving force of the driving mechanism.

  Further, in the present invention, since the shape of the sheet-like coil can be maintained by solder joining using the solder land, the inner peripheral surface of the case body and the sheet-like shape as in the optical device described in Patent Document 1. Compared with the case where the shape of the sheet-like coil is maintained by the adhesive filled between the coils, it is possible to suppress the change in the shape of the sheet-like coil due to environmental changes such as temperature changes. . That is, when the shape of the sheet-like coil is maintained by the adhesive filled between the inner peripheral surface of the case body and the sheet-like coil, the adhesive expands or contracts due to an environmental change such as a temperature change. Although the shape of the sheet-like coil is likely to fluctuate, if the shape of the sheet-like coil is maintained by solder bonding, the solder joint is less susceptible to environmental changes such as temperature changes, so environmental changes such as temperature changes It is possible to suppress the variation in the shape of the sheet-like coil due to the above. Therefore, it is possible to stabilize the driving force of the driving mechanism by suppressing the fluctuation of the gap between the driving magnet and the coil portion due to the environmental change.

In the present invention , since the solder land is formed on the surface of the sheet-shaped coil facing the inner peripheral surface of the case body, the sheet-shaped coil is wound around a predetermined jig when assembling the optical device. It becomes possible to solder-bond the end portions in the longitudinal direction of the sheet-like coil in a state where the shape is adjusted. Therefore, the joining work of the longitudinal ends of the sheet-like coil is facilitated.

In the present invention , since a notch is formed at a location corresponding to the solder land of the case body, the solder land is formed on the surface of the sheet-like coil facing the inner peripheral surface of the case body. Even in this case, the contact between the solder on the solder land and the case body can be prevented. Therefore, it is possible to prevent the sheet-like coil from being deformed due to the contact between the solder on the solder land and the case body. It becomes possible to secure a large gap. Further, in the present invention, the case body is formed in a substantially rectangular tube shape, and the sheet-like coil is bent at substantially right angles at four positions in the longitudinal direction of the sheet-like coil, and the longitudinal ends of the sheet-like coil are arranged with each other. Is fixed to the inner peripheral surface of the case body in a state of being formed into a substantially square cylinder shape by being joined on one of the four side surfaces of the substantially square cylindrical case body. Even if a notch for preventing contact between the upper solder and the case body is formed in the case body, it is possible to suppress a decrease in rigidity of the case body. That is, the sheet-like coil is bent at a substantially right angle at three locations in the longitudinal direction, and ends in the longitudinal direction are joined at one corner of the four corners of the case body to form a substantially rectangular tube shape. If the case body is formed with a notch for preventing contact between the solder on the solder land and the case body, the notch is formed at the corner of the case body. The rigidity of the body tends to decrease. On the other hand, when the end portions in the longitudinal direction of the sheet-like coil are joined to each other at the side surface of the case body, the notch portion for preventing contact between the solder on the solder land and the case body is provided. Even if it is formed, since the notch is formed on the side surface of the case body, the rigidity of the case body is unlikely to decrease.

  In the present invention, the solder land is preferably formed on one end side of the sheet coil in the short direction of the sheet coil perpendicular to the longitudinal direction of the sheet coil. When fixing the sheet-like coil to the inner peripheral surface of the case body, for example, the sheet-like coil in a state where the end portions in the longitudinal direction of the sheet-like coil are soldered together is connected from the other end side in the short direction. Although it is inserted into the inner peripheral side of the case body and fixed to the inner peripheral surface of the case body, this configuration reduces the size of the notch portion even when the notch portion is formed in the case body. It becomes possible to do. Accordingly, it is possible to suppress a decrease in rigidity of the case body.

  As described above, in the optical device of the present invention, the driving force of the driving mechanism can be stabilized by maintaining the shape of the sheet-like coil disposed along the inner peripheral surface of the case body relatively easily. become.

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. It is a disassembled perspective view of the optical apparatus shown in FIG. It is a perspective view of the sheet-like coil shown in FIG. It is a figure which shows the state which expand | deployed the sheet-like coil shown in FIG. It is a perspective view of the sheet-like coil concerning other embodiments of the present invention. It is a perspective view of the sheet-like coil concerning other embodiments of the present invention.

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

(Schematic 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. In the following description, as shown in FIG. 1, the three directions orthogonal to each other are 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. To do. 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.

  The optical device 1 includes a camera module 3 as a movable part that has a photographing lens and an image sensor 2 and can swing, and a shake for correcting a shake of an optical image formed on the image sensor 2 by the lens. And a correction device 4. In this embodiment, the vertical direction substantially coincides with the optical axis direction of the camera module 3 when the camera module 3 is not swinging. In this embodiment, the image sensor 2 is mounted on the lower end side of the camera module 3, and a subject arranged 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).

(Configuration of camera module)
FIG. 3 is an exploded perspective view of the optical device 1 shown in FIG.

  The camera module 3 is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the camera module 3 is formed so as to have a substantially square shape when viewed from the optical axis direction, and the four side surfaces of the camera module 3 are substantially parallel to the left-right direction or the front-rear direction. ing. In addition to the lens and the image sensor 2, the camera module 3 includes a movable body 5 that holds the lens and can move in the optical axis direction, a holding body 6 that holds the movable body 5 so as to be movable in the optical axis direction, and a holding body. 6 includes a lens driving mechanism 7 for driving the movable body 5 in the optical axis direction. The movable body 5 is movably held by the holding body 6 via a leaf spring 9 disposed on the upper end side of the movable body 5 and a leaf spring 10 disposed on the lower end side of the movable body 5.

  The movable body 5 includes a lens holder 12 to which a plurality of lenses are fixed, and a sleeve 13 that holds the lens holder 12. The lens holder 12 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed to the inner peripheral side of the lens holder 12. The sleeve 13 is formed in a substantially cylindrical shape. The outer peripheral surface of the lens holder 12 is fixed to the inner peripheral surface of the sleeve 13.

  The holding body 6 includes a cover member 14 that forms four side surfaces of the camera module 3 and a base member 15 that forms a lower end side portion of the camera module 3. The cover member 14 is formed in a substantially rectangular tube shape with a bottom having a bottom portion 14a and a tube portion 14b. The bottom portion 14 a is disposed on the upper side and constitutes an end surface on the subject side of the camera module 3. A through hole 14c is formed in the center of the bottom portion 14a. The cover member 14 is disposed so as to surround the outer peripheral side of the movable body 5 and the lens driving mechanism 7. The base member 15 is formed in a flat and substantially rectangular parallelepiped shape. A through hole 15a is formed at the center of the base member 15, and the base member 15 is formed so that the shape when viewed from the optical axis direction is a substantially square frame. The base member 15 is fixed to the lower end of the cylindrical portion 14 b of the cover member 14.

  The lens driving mechanism 7 includes two lens driving coils 18 wound along the outer peripheral surface of the movable body 5 and four lens driving magnets 19 arranged to face the lens driving coil 18. ing. The two lens driving coils 18 are fixed to the outer peripheral surface of the sleeve 13 with a predetermined interval in the vertical direction. The lens driving magnet 19 is formed in a substantially quadrangular prism shape having a substantially isosceles trapezoidal shape when viewed from the optical axis direction. The four lens driving magnets 19 are fixed to the four corners of the inner peripheral surface of the cylindrical portion 14 b of the cover member 14.

  The image sensor 2 is mounted on the substrate 22. The substrate 22 is fixed to the lower surface of the base member 15. An FPC (flexible printed circuit board) 23 is connected to the substrate 22, and the FPC 23 is drawn around on the lower end side of the optical device 1 and pulled out from the side surface of the optical device 1. Further, a contact plate 24 with which a fulcrum projection 35a described later contacts is fixed to the lower surface of the substrate 22.

  The camera module 3 also includes later-described magnet holding frames 43 and 44 and a stopper member 45 that are attached to the cylindrical portion 14 b of the cover member 14.

(Configuration of shake correction device)
The shake correction device 4 includes a support 27 that supports the camera module 3 in a swingable manner, a leaf spring 28 that connects the camera module 3 and the support 27, and a support 27 for correcting shake such as camera shake. And a swing drive mechanism 29 that swings the camera module 3. The support body 27 in this embodiment is a holding unit that movably holds the camera module 3 that is a movable unit, and the swing drive mechanism 29 is a drive mechanism that drives the camera module 3 that is a movable unit.

  The support body 27 includes a case body 31 that forms four front, back, left, and right side surfaces of the optical device 1 and a lower case body 32 that forms a lower end side portion of the optical device 1. The case body 31 is formed in a substantially rectangular tube shape, and the axial direction and the vertical direction thereof substantially coincide with each other. Further, the case body 31 is arranged so as to cover the camera module 3 and a shake correction magnet 39 and a sheet-like coil 40, which will be described later, constituting the swing drive mechanism 29 from the outer peripheral side. As shown in FIG. 3, the lower case body 32 includes a substantially square bottom portion 32a and three side portions 32b. A side plate 33 is fixed to a portion of the side surface of the lower case body 32 where the side surface portion 32b is not formed.

  A bottom portion 32 a of the lower case body 32 is disposed on the lower side and constitutes the lower surface of the optical device 1. As shown in FIG. 2, the center part of the bottom part 32a is dented toward the upper side. A through hole 32c is formed at the center of the bottom 32a. A fulcrum member 35 on which a fulcrum protrusion 35a serving as a fulcrum for the swing of the camera module 3 is formed is disposed in the recess of the bottom 32a. The fulcrum protrusion 35a is formed in a substantially hemispherical shape. The fulcrum protrusion 35a is disposed so as to protrude from the upper surface of the bottom 32a through the through hole 32c, and is in contact with the contact plate 24. A fixing plate 36 is fixed to the lower surface of the bottom portion 32a so as to close the recess of the bottom portion 32a, and the fulcrum member 35 is held in the recess of the bottom portion 32a by the fixing plate 36.

  The leaf spring 28 includes four movable side fixing portions 28a fixed to the camera module 3, a holding side fixing portion 28b fixed to the support 27, and four movable side fixing portions 28a and the holding side fixing portion 28b. Arm portion 28c. In this embodiment, the arm portion 28c is bent with respect to the holding side fixing portion 28b, so that the camera module 3 fixed to the movable side fixing portion 28a can swing. Note that the leaf spring 28 generates a pressurizing force for surely bringing the fulcrum protrusion 35a and the contact plate 24 into contact with each other (that is, an urging force for urging the camera module 3 downward). Like), it is fixed in a bent state.

  The swing drive mechanism 29 is a sheet-like body integrally including four shake correction magnets 39 and four coil portions 38 that are opposed to each of the four shake correction magnets 39 with a predetermined gap therebetween. And a coil 40. The shake correction magnet 39 of this embodiment is a drive magnet.

  The shake correction magnet 39 is formed in a substantially rectangular flat plate shape. The upper end surfaces of the four shake correction magnets 39 are fixed to the magnet holding frame 43, and the lower end surfaces of the four shake correction magnets 39 are fixed to the magnet holding frame 44. The magnet holding frames 43 and 44 are formed in a flat plate shape and a substantially square frame shape. The magnet holding frames 43 and 44 are arranged on the outer periphery of the cylindrical portion 14b so that the four shake correcting magnets 39 are arranged on the four outer surfaces constituting the outer peripheral surface of the cylindrical portion 14b of the cover member 14, respectively. It is fixed to the surface. That is, the four shake correction magnets 39 are attached to the outer peripheral surface of the camera module 3 via the magnet holding frames 43 and 44.

  A stopper member 45 for restricting the movable range of the camera module 3 in the front-rear and left-right directions when an impact such as dropping is applied to the optical device 1 is fixed to the lower surface of the magnet holding frame 44. The stopper member 45 is formed in a flat plate shape and a substantially square frame shape.

  The sheet-like coil 40 is an FP coil configured by forming four coil portions 38 made of fine copper wiring on a printed board. The coil part 38 is formed in a substantially rectangular frame shape. Further, the surface of the coil portion 38 is covered with an insulating film. The sheet coil 40 is connected to the FPC 23 via a relay FPC 41. Hereinafter, a specific configuration of the sheet coil 40 will be described.

(Configuration of sheet coil)
FIG. 4 is a perspective view of the sheet-like coil 40 shown in FIG. FIG. 5 is a diagram showing a state in which the sheet-like coil 40 shown in FIG. 4 is developed.

  The sheet coil 40 is formed in a band shape. Specifically, the sheet coil 40 is formed in an elongated rectangular shape. Solder lands 48 for soldering the longitudinal ends of the sheet coil 40 to each other are formed at both ends in the longitudinal direction of the sheet coil 40. In the following description, when the four coil portions 38 formed on the sheet coil 40 are distinguished from each other, the four coil portions 38 are referred to as coil portions 38A to 38D. As shown in FIG. 5, the coil portions 38 </ b> A to 38 </ b> D are formed in this order in the longitudinal direction of the sheet-like coil 40.

  The sheet-like coil 40 is fixed to the inner peripheral surface of the case body 31 with the longitudinal ends of the sheet-like coil 40 being soldered together by soldering using the solder lands 48. Specifically, the sheet-like coil 40 is bent in a substantially right angle at four positions in the longitudinal direction and the ends in the longitudinal direction are soldered together to form a substantially rectangular tube shape. It is fixed to the inner peripheral surface of the body 31 by adhesion or the like. Further, the sheet-like coil 40 is arranged such that each of the four coil portions 38 is disposed on each of the four inner surfaces constituting the inner peripheral surface of the case body 31, and the inner peripheral surface of the case body 31. Are fixed to the inner peripheral surface of the case body 31. The joint 40a where the longitudinal ends of the sheet coil 40 are joined is disposed in one of the four sides of the case body 31 formed in a substantially rectangular tube shape. That is, end portions in the longitudinal direction of the sheet-like coil 40 are joined to one side surface among the four side surfaces of the case body 31. In this embodiment, the sheet-like coil 40 is directly fixed to the inner peripheral surface of the case body 31, but the sheet-like coil 40 is fixed to the inner peripheral surface of the case body 31 via a predetermined member. May be.

  The solder land 48 is formed on the surface of the sheet coil 40 facing the inner peripheral surface of the case body 31. That is, the solder land 48 is formed on the outer peripheral side of the sheet coil 40. The solder land 48 is formed on one end side of the sheet-like coil 40 in the short direction of the sheet-like coil 40 perpendicular to the longitudinal direction of the sheet-like coil 40. Specifically, the solder land 48 is formed on the lower end side of the sheet coil 40. In this embodiment, one solder land 48 is formed at each of both end portions of the sheet-like coil 40 in the longitudinal direction. The solder lands 48 are not electrically connected to various wiring patterns formed on the coil portion 38 and the sheet-like coil 40.

  Assuming that the folds 40b to 40e of the sheet-like coil 40 bent at substantially right angles at four locations (see FIG. 5) and the folds 40b to 40e are arranged in this order in the longitudinal direction of the sheet-like coil 40, for example, As shown in FIG. 5, the distance between the coil part 38A and the crease 40b arranged between the creases 40b and 40c is short, but the distance between the coil part 38A and the crease 40c is long. Moreover, although the distance of the coil part 38B arrange | positioned between the creases 40c and 40d and the crease | fold 40d is short, the distance of the coil part 38B and the crease | fold 40c is long, and the coil part arrange | positioned between the creases 40d and 40e Although the distance between 38C and the crease 40e is short, the distance between the coil portion 38C and the crease 40d is long. Moreover, the coil part 38 is not formed between the longitudinal end of the sheet-like coil 40 and the crease 40b.

  The coil portions 38 </ b> A to 38 </ b> D are formed at substantially the same position in the short direction of the sheet coil 40. Further, as shown in FIG. 4, in the sheet-like coil 40 fixed to the inner peripheral surface of the case body 31 in a state of being formed in a substantially rectangular tube shape, the coil portion 38A and the coil portion 38C are arranged in the front-rear direction or the left-right direction. The coil portion 38B and the coil portion 38D are disposed at substantially the same position in the left-right direction or the front-rear direction. That is, in the sheet-like coil 40 fixed to the inner peripheral surface of the case body 31, the coil portion 38A and the coil portion 38C face each other in the front-rear direction or the left-right direction, and the coil portion 38B and the coil portion 38D face the left-right direction or the front-rear direction. Opposite in direction.

  In this embodiment, between the coil portion 38A and the crease 40c, between the coil portion 38B and the crease 40c, between the coil portion 38C and the crease 40d, and between one end in the longitudinal direction of the sheet-like coil 40 and the crease 40b. Photo reflectors for detecting the position of the camera module 3 with respect to the support 27 are mounted at a total of four locations. Alternatively, either one of the coil portion 38A and the crease 40c, or between the coil portion 38C and the crease 40d, and between the coil portion 38B and the crease 40c, or one end of the sheet coil 40 in the longitudinal direction. Photo reflectors for detecting the position of the camera module 3 with respect to the support 27 are mounted at a total of two locations between the crease 40b and one of them. Note that the FPC 41 is connected to the sheet-like coil 40 between the folds 40b and 40c.

  As shown in FIGS. 1 and 3, a cutout portion 31 a is formed at a location corresponding to the solder land 48 of the case body 31. That is, a cutout 31 a is formed on one side surface of the case body 31. The cutout 31a is formed in a predetermined range from the lower end of the case body 31 toward the upper end side. Further, on the other side surface of the case body 31, a notch portion 31 b for connecting the FPC 41 to the sheet coil 40 is formed.

(Schematic operation of optical device for photographing)
In the optical device 1, when a current is supplied to the lens driving coil 18, the lens moves in the optical axis direction together with the movable body 5. In the optical device 1, when a change in the tilt of the camera module 3 is detected by a gyroscope (not shown), a current is supplied to the coil unit 38 based on the detection result of the gyroscope. When a current is supplied to the coil section 38, the camera module 3 swings so that the optical axis L is inclined with the fulcrum protrusion 35a as the center and the left-right direction and / or the front-rear direction as the axial direction, thereby correcting the shake. Is done.

(Fixing method of sheet coil to case body)
When assembling the optical device 1, when fixing the sheet-like coil 40 to the inner peripheral surface of the case body 31, first, the sheet-like coil 40 is bent at the folds 40 b to 40 e. Further, the sheet-like coil 40 is wound around a predetermined jig so that the sheet-like coil 40 has a substantially rectangular tube shape, and the shape of the sheet-like coil 40 is adjusted. Thereafter, using the solder lands 48, the longitudinal ends of the sheet-like coil 40 are soldered together. Thereafter, the sheet-like coil 40 is inserted from the lower end side of the case body 31 to the inner peripheral side of the case body 31 and fixed to the inner peripheral surface of the case body 31 by adhesion or the like.

(Main effects of this form)
As described above, in the present embodiment, the sheet coil 40 has the inner periphery of the case body 31 in a state where the longitudinal ends of the sheet coil 40 are soldered together by soldering using the solder lands 48. It is fixed to the surface. Therefore, the shape of the sheet-like coil 40 fixed to the inner peripheral surface of the case body 31 can be maintained by soldering using the solder land 48. That is, the shape of the sheet-like coil 40 disposed along the inner peripheral surface of the case body 31 can be maintained relatively easily by soldering using the solder land 48. As a result, in this embodiment, it is possible to secure an appropriate gap between the shake correction magnet 39 and the coil portion 38 and stabilize the driving force of the swing drive mechanism 29.

  Further, in this embodiment, since the shape of the sheet coil 40 can be maintained by soldering using the solder lands 48, the inside of the case body 31 as in the optical device described in Patent Document 1 described above. Compared to the case where the shape of the sheet-like coil 40 is maintained by the adhesive filled between the peripheral surface and the sheet-like coil 40, the variation in the shape of the sheet-like coil 40 due to environmental changes such as temperature changes. Can be suppressed. That is, when the shape of the sheet-like coil 40 is maintained by the adhesive filled between the inner peripheral surface of the case body 31 and the sheet-like coil 40, the adhesive expands due to an environmental change such as a temperature change. The shape of the sheet-like coil 40 is likely to change due to shrinkage. However, when the shape of the sheet-like coil 40 is maintained by solder bonding, the solder-joined portion is not easily affected by environmental changes such as temperature changes. Variations in the shape of the sheet coil 40 due to environmental changes such as changes can be suppressed. Therefore, in this embodiment, it is possible to stabilize the driving force of the swing drive mechanism 29 by suppressing fluctuations in the gap between the shake correction magnet 39 and the coil portion 38 due to environmental changes.

  In this embodiment, the solder land 48 is formed on the surface of the sheet-like coil 40 facing the inner peripheral surface of the case body 31. Therefore, in the present embodiment, when the optical device 1 is assembled, even if the sheet-like coil 40 is wound around a predetermined jig and the shape thereof is adjusted, the longitudinal ends of the sheet-like coil 40 are easily soldered together. Is possible.

  In this embodiment, a notch 31 a is formed at a location corresponding to the solder land 48 of the case body 31. Therefore, even if the solder land 48 is formed on the surface of the sheet-like coil 40 facing the inner peripheral surface of the case body 31, contact between the solder on the solder land 48 and the inner peripheral surface of the case body 31 is prevented. It becomes possible to do. Therefore, in this embodiment, it is possible to prevent the sheet-like coil 40 from being deformed due to the contact between the solder on the solder land 48 and the inner peripheral surface of the case body 31, and as a result, An appropriate gap between the shake correction magnet 39 and the coil portion 38 can be secured.

  In this embodiment, the solder land 48 is formed on the lower end side of the sheet coil 40. Therefore, even when the sheet-like coil 40 is inserted from the lower end side of the case body 31 to the inner peripheral side of the case body 31 at the time of assembling the optical device 1 as in the present embodiment, the size of the notch 31a. Can be reduced. Therefore, in this embodiment, even when the notch 31 a is formed in the case body 31, it is possible to suppress a decrease in rigidity of the case body 31.

  In this embodiment, the coil portions 38 </ b> A to 38 </ b> D are formed at substantially the same position in the short direction of the sheet coil 40, and are fixed to the inner peripheral surface of the case body 31 in a state of being formed in a substantially rectangular tube shape. In the sheet-like coil 40, the coil part 38A and the coil part 38C are arranged at substantially the same position in the front-rear direction or the left-right direction, and the coil part 38B and the coil part 38D are arranged at substantially the same position in the left-right direction or the front-rear direction. ing. Therefore, in this embodiment, it is possible to balance the driving force of the swing drive mechanism 29 in the left-right direction and the balance in the front-rear direction. As a result, the swing operation of the camera module 3 by the swing drive mechanism 29 is achieved. Can be stabilized.

  In this embodiment, between the coil portion 38A and the crease 40c, between the coil portion 38B and the crease 40c, between the coil portion 38C and the crease 40d, and between one end in the longitudinal direction of the sheet-like coil 40 and the crease 40b. Photo reflectors for detecting the position of the camera module 3 with respect to the support 27 are mounted at a total of four locations. Alternatively, either one of the coil portion 38A and the crease 40c, or between the coil portion 38C and the crease 40d, and between the coil portion 38B and the crease 40c, or one end of the sheet coil 40 in the longitudinal direction. Photo reflectors for detecting the position of the camera module 3 with respect to the support 27 are mounted at a total of two locations between the crease 40b and one of them. Therefore, in this embodiment, the optical device 1 can be reduced in size.

(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 embodiment described above, the solder land 48 is formed on the surface of the sheet coil 40 facing the inner peripheral surface of the case body 31. In addition, for example, the solder land 48 may be formed on the surface side of the sheet-like coil 40 facing the shake correction magnet 39. That is, the solder land 48 may be formed on the inner peripheral side of the sheet coil 40. In this case, since the solder on the solder land 48 is arranged on the inner peripheral side of the sheet-like coil 40, the notch 31a for preventing the solder on the solder land 48 from contacting the case body 31 is provided in the case body. No need to form 31. Accordingly, it is possible to prevent a decrease in the rigidity of the case body 31, and it is possible to simplify the shape of the case body 31.

  In the embodiment described above, the sheet-like coil 40 is bent at substantially right angles at four locations in the longitudinal direction, and the end portions in the longitudinal direction are soldered to one of the four side surfaces of the case body 31. Yes. In addition to this, for example, as shown in FIGS. 6 and 7, the sheet-like coil 40 is bent at substantially right angles at three locations in the longitudinal direction, and the ends in the longitudinal direction are among the four corners of the case body 31. It may be soldered at one corner. In this case, as shown in FIG. 6, for example, solder lands 48 are formed on the opposite sides of the both ends in the longitudinal direction of the sheet-like coil 40 to the inner peripheral surface of the case body 31. Further, in this case, as shown in FIG. 7, a solder land 48 is formed on one side of the longitudinal direction of the sheet-like coil 40 on the side facing the inner peripheral surface of the case body 31 to form a sheet-like shape. A solder land 48 is formed on the other end in the longitudinal direction of the coil 40 on the side facing the shake correcting magnet 39, and the other end in the longitudinal direction of the sheet-like coil 40 protrudes to the outer peripheral side. In the state, the end portions in the longitudinal direction of the sheet-like coil 40 may be soldered together.

  When the longitudinal ends of the sheet-like coil 40 are soldered together at the corners of the case body 31, the joints 40 a of the sheet-like coil 40 are arranged at the corners of the case body 31 (that is, Since the joining portion 40a is not disposed in the side surface of the case body 31, the coil portion 38 is formed on the entire portion of the sheet-like coil 40 corresponding to the side surface of the case body 31 as shown in FIGS. It becomes possible. Therefore, the driving force of the swing drive mechanism 29 can be increased. Further, in this case, the number of bent portions of the sheet-like coil 40 can be reduced, so that the folding operation of the sheet-like coil 40 is facilitated.

  In addition, in order to prevent contact between the solder on the solder land 48 and the inner peripheral surface of the case body 31 when the longitudinal ends of the sheet-like coil 40 are soldered together on the side surface of the case body 31. Even if the notch 31 a is formed in the case body 31, it is possible to suppress a decrease in rigidity of the case body 31. That is, as shown in FIG. 6, when the longitudinal ends of the sheet-like coil 40 are soldered at the corners of the case body 31, the solder on the solder lands 48 and the inner periphery of the case body 31. Since the notches for preventing contact with the surface are formed at the corners of the case body 31, the rigidity of the case body 31 is likely to decrease. On the other hand, when the end portions in the longitudinal direction of the sheet-like coil 40 are soldered together on the side surface of the case body 31, the notch portion 31 a is formed on the side surface of the case body 31. It becomes difficult for the rigidity of a to fall.

  In the embodiment described above, the solder land 48 is formed on the lower end side of the sheet coil 40. In addition, for example, the solder land 48 may be formed on the upper end side of the sheet-like coil 40 or may be formed at an intermediate position of the sheet-like coil 40 in the vertical direction. Moreover, the solder land 48 may be formed in the whole area of the sheet-like coil 40 in the up-down direction. In the above-described embodiment, one solder land 48 is formed at each of the longitudinal ends of the sheet-like coil 40. However, two or more solder lands 48 are provided at each of the longitudinal ends of the sheet-like coil 40. A solder land 48 may be formed.

  In the embodiment described above, the sheet coil 40 is an FP coil configured by forming four coil portions 38 made of fine copper wiring on a printed circuit board. In addition to this, for example, the sheet-like coil 40 includes four FP coils configured by forming one coil portion 38 on a printed circuit board, and an FPC on which the four FP coils are mounted. It may be composed of In this case, a solder land 48 is formed on the FPC.

  In the embodiment described above, the photo reflector for detecting the position of the camera module 3 with respect to the support 27 is mounted on the sheet-like coil 40. In addition to this, for example, the photo reflector may not be mounted on the sheet-like coil 40 but may be disposed at a place other than the sheet-like coil 40.

  In the embodiment described above, the lens driving mechanism 7 is a so-called voice coil motor including the lens driving coil 18 and the lens driving magnet 19. In addition to this, for example, the lens driving mechanism 7 may include a piezoelectric element for moving the lens in the optical axis direction instead of the lens driving coil 18 and the lens driving magnet 19, or a shape memory alloy. May be provided. 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 3 may not include the lens driving mechanism 7. In this case, for example, the sleeve 13 is fixed to the holding body 6.

  In the embodiment described above, the embodiment of the present invention has been described by taking the optical device 1 having the camera module 3 as a movable portion and the support 27 as a holding portion as an example. However, the configuration of the present invention is an optical device other than the optical device 1. It is also applicable to the device. For example, the configuration of the present invention can be applied to the camera module 3 in which the movable body 5 is a movable portion, the holding body 6 is a holding portion, and the lens driving mechanism 7 is a driving mechanism.

1 Optical device 3 Camera module (movable part)
27 Support (holding part)
29 Swing drive mechanism (drive mechanism)
31 Case body 31a Notch portion 38 Coil portion 39 Shake correction magnet (drive magnet)
40 Sheet coil 48 Solder land

Claims (2)

A movable portion having a lens for photographing, a holding portion that movably holds the movable portion, and a drive mechanism that drives the movable portion,
The drive mechanism includes a plurality of drive magnets attached to the outer peripheral surface of the movable portion, and a belt-like sheet coil integrally including a plurality of coil portions arranged to face each of the plurality of drive magnets. ,
The holding portion includes a case body having a substantially rectangular tube shape that covers an outer peripheral side of the driving magnet and the sheet-like coil,
Solder lands for soldering the longitudinal ends of the sheet-like coil to each other are formed at both ends in the longitudinal direction of the sheet-like coil formed in a strip shape,
The sheet-like coil is bent at substantially right angles at four points in the longitudinal direction of the sheet-like coil, and the longitudinal ends of the sheet-like coil are of the four side surfaces of the case body having a substantially rectangular tube shape. In a state of being formed into a substantially square cylindrical shape by being soldered on one of the side surfaces of the case, it is fixed to the inner peripheral surface of the case body ,
The solder land is formed on the surface of the sheet-like coil facing the inner peripheral surface of the case body,
An optical device , wherein a notch portion is formed at a location corresponding to the solder land of the case body . The solder land, the optical device according to claim 1, characterized in that it is formed at one end of the sheet-shaped coil in the lateral direction of the sheet-like coil which is perpendicular to the longitudinal direction of the sheet-like coil.

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