Optical device

An optical device may include a movable part including a lens; a holding part to hold the movable part; and a drive mechanism to drive the movable part. The holding part may include a case body. The drive mechanism may include a plurality of drive magnets; a plurality of sheet-shaped coils including a coil part; and a flexible printed circuit board including a coil attaching part. A plurality of the sheet-shaped coils may be attached to one face of the coil attaching part. A thickness of the coil attaching part is thinner than the sheet-shaped coil. A width of the coil attaching part may be narrower than a width of the sheet-shaped coil.

CROSS REFERENCE TO RELATED APPLICATIONS

This is the U.S. national stage of application No. PCT/JP2013/083054, filed on Dec. 10, 2013. Priority under 35 U.S.C. § 119(a) and 35 U.S.C. § 365(B) is claimed from Japanese Application No. 2012-269974, filed Dec. 11, 2012, the disclosures of which are incorporated herein by reference.

FIELD OF THE INVENTION

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

BACKGROUND

Conventionally, an optical unit has been known which is provided with a shake correction function by which a movable module mounted with a lens and an imaging element is swung to correct a shake (see, for example, Patent Literature 1). An optical unit described in Patent Literature 1 includes a fixed body swingably holding a movable module and a shake correction drive mechanism structured to swing the movable module with respect to the fixed body. The shake correction drive mechanism in the optical unit includes four permanent magnets which are formed in a substantially quadrangular plate shape and are fixed to an outer peripheral face of the movable module and a sheet-shaped coil which is formed in a band shape and is integrally provided with four coil parts facing the four permanent magnets respectively. The fixed body is provided with an upper cover in a substantially rectangular tube shape which structures an outer peripheral face of the optical unit.

In the optical unit described in Patent Literature 1, the sheet-shaped coil formed in a band shape is fixed to an inner peripheral face of the upper cover so as to be along the inner peripheral face of the upper cover in a state that the sheet-shaped coil is bent at positions between the coil parts and is formed in a substantially rectangular tube shape. The sheet-shaped coil is fixed to the inner peripheral face of the upper cover by adhesion. In a case that the sheet-shaped coil is to be fixed to the upper cover, for example, in a state that an adhesive is applied to the inner peripheral face of the upper cover, the sheet-shaped coil bent in a substantially rectangular tube shape is inserted into an inner peripheral side with respect to the upper cover from one end side in an axial direction of the upper cover formed in a substantially rectangular tube shape and then the adhesive is cured.

CITATION LIST

Patent Literature

In the optical unit described in Patent Literature 1, the coil parts are formed in the sheet-shaped coil and the thickness of the sheet-shaped coil is relatively large and thus rigidity of the sheet-shaped coil is relatively high. Therefore, in the optical unit, in a case that the sheet-shaped coil is to be fixed to the inner peripheral face of the upper cover, even when the sheet-shaped coil is bent in a substantially rectangular tube shape so as to be along the inner peripheral face of the upper cover, the shape of the sheet-shaped coil is not stable. Accordingly, in the optical unit, work for fixing the sheet-shaped coil to the upper cover is complicated. Further, in the optical unit, since the shape of the sheet-shaped coil is not stable, in a case that the sheet-shaped coil is to be attached to the upper cover, when the sheet-shaped coil bent in a substantially rectangular tube shape is inserted into an inner peripheral side with respect to the upper cover from one end side in the axial direction of the upper cover in a state that an adhesive is applied to an inner peripheral face of the upper cover, the adhesive having been applied to the inner peripheral face of the upper cover is scraped by the sheet-shaped coil and thus attaching strength of the sheet-shaped coil to the upper cover may be decreased.

SUMMARY

In view of the problem described above, at least an embodiment of the present invention provides an optical device including a movable part and a holding part movably holding the movable part and also including a sheet-shaped coil which is integrally provided with a coil part, the optical device being capable of easily performing attaching work of the sheet-shaped coil to the movable part or the holding part and capable of increasing attaching strength of the sheet-shaped coil to the movable part or the holding part.

To achieve the above, at least an embodiment of the present invention provides an optical device including a movable part having a lens for photographing, a holding part which movably holds the movable part, and a drive mechanism structured to drive the movable part. The holding part includes a case body which covers an outer peripheral side of the movable part The drive mechanism includes a plurality of drive magnets which are attached to one of an outer peripheral side of the movable part and an inner peripheral side of the case body, a plurality of sheet-shaped coils integrally having a coil part which are oppositely disposed to the drive magnets, and a flexible printed circuit board which is provided with a coil attaching part in a band shape to which a plurality of the sheet-shaped coils is attached, the flexible printed circuit board being attached to the other of the outer peripheral side of the movable part and the inner peripheral side of the case body. A plurality of the sheet-shaped coils is attached to one face of the coil attaching part with a predetermined gap space therebetween in a longitudinal direction of the coil attaching part formed in the band shape, a thickness of the coil attaching part is thinner than a thickness of the sheet-shaped coil, and a width of the coil attaching part in a short widthwise direction of the coil attaching part which is perpendicular to the longitudinal direction of the coil attaching part is narrower than a width of the sheet-shaped coil in the short widthwise direction of the coil attaching part. The other face of the coil attaching part is attached to the other of the outer peripheral side of the movable part and the inner peripheral side of the case body in a state that the coil attaching part is bent in a gap space portion between the sheet-shaped coils so as to be along the other of the outer peripheral side of the movable part and the inner peripheral side of the case body and the coil attaching part is formed in a substantially tube shape.

In the optical device in accordance with at least an embodiment of the present invention, in a state that the coil attaching part one face of which is attached with a plurality of the sheet-shaped coils is bent in a gap space portion between the sheet-shaped coils so as to be along the other of the outer peripheral side of the movable part and the inner peripheral side of the case body and the coil attaching part is formed in a substantially tube shape, the other face of the coil attaching part is attached to the other of the outer peripheral side of the movable part and the inner peripheral side of the case body. Further, in at least an embodiment of the present invention, the thickness of the coil attaching part is thinner than the thickness of the sheet-shaped coil. In other words, in at least an embodiment of the present invention, the coil attaching part is bent in a portion which is thinner than the sheet-shaped coil. Therefore, in at least an embodiment of the present invention, a shape of the coil attaching part which is bent in a gap space portion between the sheet-shaped coils and is formed in a substantially tube shape is easily stabilized and thus the coil attaching part formed in a substantially tube shape is easily handled. Accordingly, in at least an embodiment of the present invention, attaching work of the sheet-shaped coils to the case body which structures the holding part or to the movable part can be easily performed.

Further, in at least an embodiment of the present invention, a plurality of the sheet-shaped coils is attached to one face of the coil attaching part and the other face of the coil attaching part is attached to the other of the outer peripheral side of the movable part and the inner peripheral side of the case body and, in addition, the width of the coil attaching part in a short widthwise direction of the coil attaching part is narrower than the width of the sheet-shaped coil in the short widthwise direction of the coil attaching part. Therefore, according to at least an embodiment of the present invention, a gap space having a width of the thickness of the coil attaching part can be formed between the outer peripheral side of the movable part or the inner peripheral side of the case body and the sheet-shaped coil. Accordingly, in at least an embodiment of the present invention, for example, an adhesive for adhesively bonding the outer peripheral side of the movable part or the inner peripheral side of the case body and the sheet-shaped coil to each other can be retained in the gap space. In other words, according to at least an embodiment of the present invention, the gap space having a width of the thickness of the coil attaching part which is formed between the outer peripheral side of the movable part or the inner peripheral side of the case body and the sheet-shaped coil can be utilized as an adhesive reservoir. As a result, in at least an embodiment of the present invention, attaching strength of the sheet-shaped coil to the case body structuring the holding part or to the movable part can be increased.

In at least an embodiment of the present invention, for example, the drive mechanism includes four sheet-shaped coils, the case body includes a tube part which is formed in a substantially rectangular tube shape, the coil attaching part is fixed to the tube part, and the other face of the coil attaching part is attached to the inner peripheral face of the tube part in the state that the coil attaching part is bent in the gap space portion between the sheet-shaped coils so as to be along the inner peripheral face of the case body and the coil attaching part is formed in a substantially rectangular tube shape. In this case, attaching work of the sheet-shaped coil to the tube part of the case body can be performed easily. Further, in this case, a gap space having a width of the thickness of the coil attaching part can be formed between the inner peripheral face of the tube part of the case body and the sheet-shaped coil and the gap space is utilized as an adhesive reservoir for retaining an adhesive which is used to adhesively bond the sheet-shaped coil to the inner peripheral face of the tube part and thus attaching strength of the sheet-shaped coil to the inner peripheral face of the tube part can be increased.

In at least an embodiment of the present invention, it is preferable that the coil attaching part is formed with a protruded part which is protruded in the short widthwise direction of the coil attaching part so as to contact with a part of the sheet-shaped coil. According to this structure, inclination of the sheet-shaped coil (slanting of the sheet-shaped coil) with respect to the coil attaching part can be suppressed by the protruded part. Therefore, a gap space between the drive magnet and the coil part can be maintained appropriately. Further, inclination of the sheet-shaped coil with respect to the coil attaching part can be suppressed by the protruded part and thus a gap space having a width of the thickness of the coil attaching part can be formed appropriately between the outer peripheral side of the movable part or the inner peripheral side of the case body and the sheet-shaped coil.

In at least an embodiment of the present invention, it is preferable that the sheet-shaped coil is provided with two first solder lands for supplying electric power to the coil part and a second solder land which is disposed at a position displaced from the first solder lands at least in one of the longitudinal direction of the coil attaching part and the short widthwise direction of the coil attaching part, and the first solder lands and the second solder land are soldered and fixed to the coil attaching part. According to this structure, in addition to the two first solder lands for supplying electric power to the coil part, the second solder land is soldered and fixed to the coil attaching part and thus fixed strength of the sheet-shaped coil to the coil attaching part can be increased.

In at least an embodiment of the present invention, it is preferable that the coil attaching part is formed with a protruded part which is protruded in the short widthwise direction of the coil attaching part and is contacted with a part of the sheet-shaped coil, and the second solder land is soldered and fixed to the protruded part. According to this structure, inclination of the sheet-shaped coil with respect to the coil attaching part can be suppressed by the protruded part. Therefore, a gap space between the drive magnet and the coil part can be maintained appropriately. Further, inclination of the sheet-shaped coil with respect to the coil attaching part can be suppressed by the protruded part and thus a gap space having a width of the thickness of the coil attaching part can be formed appropriately between the outer peripheral side of the movable part or the inner peripheral side of the case body and the sheet-shaped coil. Further, according to this structure, the second solder land is soldered and fixed to the protruded part and thus an arrangement space of a solder land where the second solder land is soldered and fixed is easily secured in the coil attaching part.

In at least an embodiment of the present invention, it is preferable that the flexible printed circuit board is provided with an external connection part in a band shape for electrically connecting the coil part with the outside, and the external connection part is extended from a substantially center position in the longitudinal direction of the coil attaching part formed in the band shape in a state that the coil attaching part bent in the gap space portion between the sheet-shaped coils and formed in a substantially tube shape is developed. According to this structure, in a connected portion of the external connection part with the coil attaching part, a plurality of wiring patterns connected with a plurality of coil parts is diverged toward respective both end parts of the coil attaching part and the wiring patterns are extended toward the respective both end parts of the coil attaching part. Therefore, the number of wiring patterns arranged in the short widthwise direction of the coil attaching part can be reduced and, as a result, the width of the coil attaching part in the short widthwise direction can be made narrow.

In at least an embodiment of the present invention, it is preferable that the optical device includes a plate spring having a movable side fixed part which is fixed to the movable part, a holding side fixed part which is fixed to the holding part, and a spring part which connects the movable side fixed part with the holding side fixed part and, when one side in an optical axis direction of the lens is an object side and the other side in the optical axis direction of the lens is an anti-object side, the holding side fixed part is welded and fixed to the holding part on the anti-object side with respect to the sheet-shaped coil, and the sheet-shaped coil is formed with a protruded part which protrudes toward the anti-object side. According to this structure, a distance between a welded portion of the holding side fixed part to the holding part and a main body portion of the sheet-shaped coil can be secured by utilizing the protruded part. Therefore, when the holding side fixed part is to be welded to the holding part, even in a case that sparks are scattered toward a main body portion of the sheet-shaped coil, the main body portion of the sheet-shaped coil is prevented from being damaged. Further, a short circuit can be prevented from being formed between the soldered portion of the sheet-shaped coil to the coil attaching part and the welded portion of the holding side fixed part to the holding part.

In at least an embodiment of the present invention, it is preferable that the sheet-shaped coil is formed with a coil side recessed part which is recessed in the short widthwise direction of the coil attaching part, and the coil attaching part is formed with a circuit board side recessed part which is recessed in the short widthwise direction of the coil attaching part at a position corresponding to the coil side recessed part. According to this structure, aligning of the coil attaching part with the sheet-shaped coil can be performed easily by utilizing the coil side recessed part and the circuit board side recessed part.

In at least an embodiment of the present invention, for example, the coil attaching part is formed with a through-hole for positioning the coil attaching part with respect to a jig to which the coil attaching part is fixed when the sheet-shaped coil is to be attached to the coil attaching part. In this case, the coil attaching part is positioned to the jig by utilizing the through-hole.

As described above, according to at least an embodiment of the present invention, in an optical device including a movable part and a holding part movably holding the movable part, and also including a sheet-shaped coil which is integrally provided with a coil part, attaching work of the sheet-shaped coil to the movable part or the holding part can be easily performed and attaching strength of the sheet-shaped coil to the movable part or the holding part can be increased.

DESCRIPTION OF EMBODIMENTS

(Entire Structure of Optical Device)

FIG. 1is a perspective view showing an optical device1in accordance with an embodiment of the present invention.FIG. 2is a cross-sectional view showing the “E-E” cross section inFIG. 1.FIG. 3is an exploded perspective view showing the optical device1inFIG. 1. In the following description, as shown inFIG. 1, three directions perpendicular to each other are respectively set in an “X” direction, a “Y” direction and a “Z” direction, and the “X” direction is a right and left direction, the “Y” direction is a front and rear direction, and the “Z” direction is an upper and lower direction. Further, a “Z1” direction side inFIG. 1is an “upper” side and a “Z2” direction side is a “lower” side.

An optical device1in this embodiment is a small and thin camera which is mounted on a portable apparatus such as a cell phone, a drive recorder, a monitoring camera system or the like. The optical device1is provided with an autofocus function and a shake correction function. The optical device1is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the optical device1is formed so that its shape when viewed in a direction of an optical axis “L” (optical axis direction) of a lens for photographing is a substantially square shape. Four side faces of the optical device1are substantially parallel to a plane formed by the right and left direction and the upper and lower direction (in other words, the “Z-X” plane formed by the “Z” direction and the “X” direction) or a plane formed by the front and rear direction and the upper and lower direction (in other words, the “YZ” plane formed by the “Y” direction and the “Z” direction).

The optical device1includes a movable module4as a movable part having a lens for photographing and an imaging element, and a support body5as a holding part which swingably holds the movable module4. The movable module4is connected with the support body5through a plate spring6. In this embodiment, the upper and lower direction is substantially coincided with the optical axis direction of the movable module4when the movable module4is not swung. Further, in this embodiment, an imaging element is mounted on a lower end side of the movable module4and an object to be photographed disposed on an upper side is photographed. In other words, in this embodiment, an upper side (“Z1” direction side) is an object to be photographed side (object side) which is one side in the optical axis direction and a lower side (“Z2” direction side) is an anti-object side (imaging element side, image side) which is the other side in the optical axis direction.

The movable module4is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the movable module4is formed so that its shape when viewed in the optical axis direction is a substantially square shape. The movable module4includes a movable body8which holds a lens and is movable in the optical axis direction, and a holding body9which movably holds the movable body8in the optical axis direction. The movable body8is movably held by the holding body9through a plate spring10connecting the movable body8with the holding body9on an upper end side of the movable body8and a plate spring11connecting the movable body8with the holding body9on a lower end side of the movable body8.

The movable body8includes a lens holder12to which a plurality of lenses is fixed and a sleeve13which holds the lens holder12. The holding body9includes a magnet fixing member14to which upper end faces of drive magnets38described below are fixed, a magnet fixing member15to which lower end faces of the drive magnets38are fixed, and a base member16which structures a lower end side portion of the movable module4.

The lens holder12is formed in a substantially cylindrical tube shape. A plurality of lenses is fixed to an inner peripheral side of the lens holder12. The sleeve13is formed in a substantially tube shape. Specifically, the sleeve13is formed in a substantially tube shape whose inner periphery of the sleeve13when viewed in the optical axis direction is a circular shape and its outer periphery of the sleeve13when viewed in the optical axis direction is a substantially regular octagonal shape. The sleeve13holds the lens holder12on its inner peripheral side. In other words, an outer peripheral face of the lens holder12is fixed to an inner peripheral face of the sleeve13. In this embodiment, an outer peripheral face of the sleeve13is an outer peripheral face of the movable body8and the outer peripheral face of the movable body8is formed so that its shape when viewed in the optical axis direction is a substantially regular octagonal shape.

The magnet fixing member14and15are formed in a frame shape. Specifically, the magnet fixing members14and15are formed so that their shapes when viewed in the optical axis direction are substantially square frame shapes. The movable body8is disposed on inner peripheral sides of the magnet fixing members14and15which are formed in frame shapes. The base member16is formed in a flat and substantially rectangular solid shape. A center of the base member16is formed with a through-hole16aand the base member16is formed so that its shape when viewed in the optical axis direction is a substantially square frame shape. An under face of the magnet fixing member15is fixed to an upper end face of the base member16. An IR cut filter17is fixed to the through-hole16a.

The plate spring10is provided with a movable body fixed part which is fixed to an upper end side of the sleeve13, a holding body fixed part which is fixed to the magnet fixing member14, and spring parts connecting the movable body fixed part with the holding body fixed part. The plate spring10is fixed to the sleeve13and the magnet fixing member14so that its thickness direction is substantially coincided with the upper and lower direction. The plate spring11is provided with a movable body fixed part which is fixed to a lower end side of the sleeve13, a holding body fixed part which is fixed to the magnet fixing member15, and spring parts connecting the movable body fixed part with the holding body fixed part. The plate spring11is fixed to the sleeve13and the magnet fixing member15so that its thickness direction is substantially coincided with the upper and lower direction.

The imaging element is mounted on a circuit board20. The circuit board20is fixed to an under face of the base member16. A flexible printed circuit board (FPC)21is connected with the circuit board20. The FPC21is led around on a lower end side of the optical device1and is extended out from a side face of the optical device1. An abutting plate22with which a support point member27is abutted is fixed to an under face of the circuit board20.

The support body5includes a case body25which structures four side faces of the support body5in the front and rear direction and the right and left direction, and a lower case body26which structures a lower end side portion of the support body5. In this embodiment, the case body25structures four side faces of the optical device1in the front and rear direction and the right and left direction and the lower case body26structures a lower end side portion of the optical device1.

The case body25is, for example, formed of nonmagnetic metal material. Further, the case body25is formed in a substantially bottomed square tube shape having a bottom part25aformed in a substantially quadrangular flat plate shape and a tube part25bformed in a substantially rectangular tube shape. The bottom part25ain this embodiment is formed in a substantially square flat plate shape. Further, the bottom part25ais connected with an upper end of the tube part25bto structure an upper end face of the case body25. The bottom part25ais formed with a through-hole25cpenetrating in the upper and lower direction. The through-hole25cis formed so that its center and the optical axis “L” are substantially coincided with each other. The case body25is disposed so that its axial direction and the upper and lower direction are substantially coincided with each other. Further, the case body25is disposed so as to cover the movable module4, a lens drive mechanism30and a shake correction mechanism31described below from an outer peripheral side.

The lower case body26is, as shown inFIG. 3, structured of a bottom part26awhich is formed in a substantially square flat plate shape and three side face parts26bwhich are respectively stood up toward an upper side from three sides of the bottom part26a. The bottom part26aof the lower case body26structures an under face of the optical device1. A support point member27is fixed to the center of the bottom part26a. The support point member27is formed so that a supporting point part27awhich serves as a supporting point for swinging the movable module4is protruded to an upper side. A surface of the supporting point part27ais formed in a curved face shape in which a part of a spherical surface is cut off. The supporting point part27ais abutted with the abutting plate22.

The plate spring6is provided with a movable side fixed part which is fixed to the movable module4, a holding side fixed part which is fixed to the support body5, and four spring parts which connect the movable side fixed part with the holding side fixed part. The movable side fixed part is fixed to a lower end side of the movable module4and the holding side fixed part is fixed to an upper end of the side face part26bof the lower case body26and thus the plate spring6connects the movable module4with the support body5on the lower end side (in other words, on the anti-object side).

In this embodiment, the spring parts are resiliently bent with respect to the holding side fixed part and thereby the movable module4fixed to the movable side fixed part is capable of swinging. The plate spring6is fixed in a resiliently bent state so that pressurization is generated for surely abutting the supporting point part27awith the abutting plate22(in other words, for generating an urging force which urges the movable module4to a lower direction). Further, in this embodiment, the holding side fixed part is fixed to an upper end of the side face part26bby welding. The holding side fixed part is fixed to the upper end of the side face part26bon a lower side with respect to a sheet-shaped coil34described below.

The optical device1includes a lens drive mechanism30for driving the movable body8in the optical axis direction with respect to the holding body9, and a shake correction mechanism31structured to swing the movable module4with respect to the support body5for correcting a shake such as a shake of hand. Structures of the lens drive mechanism30and the shake correction mechanism31will be described below.

(Structures of Lens Drive Mechanism and Shake Correction Mechanism)

Two lens drive coils32which structure the lens drive mechanism30are attached to an outer peripheral face of the sleeve13. The lens drive coil32is wound around along the outer peripheral face of the sleeve13. Two lens drive coils32are wound so that their winding directions are different from each other. Further, two lens drive coils32are fixed to the outer peripheral face of the sleeve13with a predetermined space therebetween in the upper and lower direction.

A sheet-shaped coil34integrally provided with a coil part33and structuring the shake correction mechanism31is disposed on respective inner sides of four side faces which structure the tube part25bof the case body25. In other words, the shake correction mechanism31includes four sheet-shaped coils34. The sheet-shaped coil34is an FP coil which is structured so that the coil part33comprised of a minute copper wiring line is formed on a printed circuit board. The coil part33is formed in a substantially rectangular frame shape and its long side portions are disposed so as to overlap in the upper and lower direction with each other. A surface of the coil part33is covered with an insulation film. A specific structure of the sheet-shaped coil34will be described below.

Four sheet-shaped coils34are electrically connected and fixed to a relay flexible printed circuit board (FPC)35. The FPC35is provided with a coil attaching part35ain a band shape to which four sheet-shaped coils34are attached, and an external connection part35bin a band shape for electrically connecting the coil parts33with the outside. The coil attaching part35ais disposed on an inner peripheral side with respect to the tube part25bin a bent state in a substantially rectangular tube shape. Four sheet-shaped coils34are attached to an inner peripheral face of the coil attaching part35awhich is bent in a substantially rectangular tube shape and an outer peripheral face of the coil attaching part35ais attached to the inner peripheral face of the tube part25b. In other words, four sheet-shaped coils34are fixed to the inner peripheral face of the tube part25bthrough the coil attaching part35a. The external connection part35bis connected with the FPC21. A specific structure of the FPC35will be described below.

The drive magnet38formed in a substantially rectangular flat plate shape is fixed to each of four straight portions of the magnet fixing member14and each of four straight portions of the magnet fixing member15which are formed in a substantially square frame shape. In other words, four drive magnets38are attached on an outer peripheral side of the movable module4. In four drive magnets38which are fixed to the magnet fixing members14and15, two drive magnets38disposed parallel to each other are disposed so as to be substantially parallel to the “Z-X” plane, and two remaining drive magnets38disposed parallel to each other are disposed so as to be substantially parallel to the “YZ” plane.

The drive magnet38is structured of two magnet pieces, i.e., a first magnet piece38aand a second magnet piece38bwhich are formed in a substantially rectangular flat plate shape, and a magnetic member38cwhich is disposed between the first magnet piece38aand the second magnet piece38b. Specifically, the first magnet piece38a, the second magnet piece38band the magnetic member38care adhesively bonded and fixed to each other in a state that the magnetic member38cis sandwiched between an under face of the first magnet piece38aand an upper face of the second magnet piece38band thereby the drive magnet38is formed.

The drive magnet38is magnetized so that a magnetic pole formed on one side face and a magnetic pole formed on the other side face are different from each other. In other words, the drive magnet38disposed substantially parallel to the “Z-X” plane is magnetized so that a magnetic pole formed on a front face of the drive magnet38and a magnetic pole formed on its rear face are different from each other. Further, the drive magnet38disposed substantially parallel to the “YZ” plane is magnetized so that a magnetic pole formed on a right side face of the drive magnet38and a magnetic pole formed on its left side face are different from each other.

Further, the drive magnet38is magnetized so that two magnetic poles different from each other are overlapped with each other in the upper and lower direction on its side face. Specifically, the drive magnet38is magnetized so that, in the front and rear direction or the right and left direction, a magnetic pole formed on an outer side face of the first magnet piece38aand a magnetic pole formed on an outer side face of the second magnet piece38bare different from each other (in other words, in the front and rear direction or the right and left direction, a magnetic pole formed on an inner side face of the first magnet piece38aand a magnetic pole formed on an inner side face of the second magnet piece38bare different from each other).

In this embodiment, four drive magnets38are disposed so that magnetic poles of inner side faces of four first magnet pieces38aare the same magnetic pole as each other (in other words, so that all magnetic poles of inner side faces of four second magnet pieces38bare the same magnetic pole as each other). In other words, in this embodiment, four drive magnets38are disposed so that all magnetic poles of outer side faces of four first magnet pieces38aare the same as each other (in other words, all magnetic poles of outer side faces of four second magnet pieces38bare the same as each other).

Inner side faces of the first magnet pieces38ain the front and rear direction or the right and left direction face an outer peripheral face of one of two lens drive coils32through a predetermined gap space, and inner side faces of the second magnet pieces38bin the front and rear direction or the right and left direction face an outer peripheral face of the other of the two lens drive coils32through a predetermined gap space. Further, outer side faces of the first magnet pieces38ain the front and rear direction or the right and left direction face one of two long side portions of the coil parts33through a predetermined gap space and outer side faces of the second magnet pieces38bin the front and rear direction or the right and left direction face the other of two long side portions of the coil parts33through a predetermined gap space.

In accordance with an embodiment of the present invention, the drive magnet38may be structured of one magnet piece. In a case that the drive magnet38is structured of one magnet piece, a portion corresponding to an arrangement portion of the magnetic member38cin this embodiment is formed as a non-magnetized region.

In this embodiment, the lens drive mechanism30is structured of the lens drive coils32, the drive magnets38and the like and, when an electric current is supplied to the lens drive coils32, a lens is moved in the optical axis direction together with the movable body8. Further, in this embodiment, the shake correction mechanism31is structured of the coil parts33, the drive magnets38and the like. When a variation of inclination of the optical device1is detected by a gyroscope disposed on an outer side of the optical device1, an electric current is supplied to the coil parts33based on a detected result by the gyroscope. Further, when an electric current is supplied to the coil parts33, the movable module4is swung with the supporting point part27aas a center so as to incline the optical axis “L” and thereby a shake is corrected. The Shake correction mechanism31in this embodiment is a drive mechanism for driving the movable module4that is a movable part.

(Specific Structures of Sheet-Shaped Coil and Flexible Printed Circuit Board)

FIG. 4is a perspective view showing a state that four sheet-shaped coils34are fixed to the flexible printed circuit board35shown inFIG. 3.FIG. 5is a perspective view showing the sheet-shaped coils34inFIG. 3.FIG. 6is a perspective view showing the flexible printed circuit board35inFIG. 3.FIG. 7is a front view showing the sheet-shaped coil34inFIG. 5. In the following descriptions, the “X1” direction side inFIG. 4and the like is referred to as a “right” side, the “X2” direction side is referred to as a “left” side, the “Y1” direction side is a “front” side, and the “Y2” direction side is a “rear” (back) side.

The sheet-shaped coil34is formed in a substantially rectangular thin flat plate shape. Two of four sheet-shaped coils34disposed parallel to each other are disposed substantially parallel to the “Z-X” plane and two remaining sheet-shaped coils34disposed parallel to each other are disposed substantially parallel to the “YZ” plane. Further, the sheet-shaped coil34is disposed so that a longitudinal direction of the sheet-shaped coil34formed in a substantially rectangular shape is coincided with the front and rear direction or the right and left direction and its short widthwise direction is coincided with the upper and lower direction.

In the following descriptions, in a case that four sheet-shaped coils34are distinguishably expressed, the sheet-shaped coil34disposed on the right side is indicated as a “sheet-shaped coil34A”, the sheet-shaped coil34disposed on a front side is indicated as a “sheet-shaped coil34B”, the sheet-shaped coil34disposed on a left side is as a “sheet-shaped coil34C”, and the sheet-shaped coil34disposed on a rear side is as a “sheet-shaped coil34D”.

A recessed part34aas a coil side recessed part is formed on a lower end side of the sheet-shaped coil34. The recessed part34ais formed so as to recess to an upper side and is formed in a substantially rectangular shape. In the sheet-shaped coils34A and34C, the recessed part34ais formed at a substantially center position in the front and rear direction and in a predetermined range in the front and rear direction. In the sheet-shaped coils34B and34D, the recessed part34ais formed at a substantially center position in the right and left direction and in a predetermined range in the right and left direction.

Three protruded parts34bthrough34dslightly protruding toward a lower side (anti-object side) are formed on a lower end side of the sheet-shaped coil34. In the sheet-shaped coil34A, the protruded part34bis formed so as to be connected with a rear end of the recessed part34a, the protruded part34cis formed so as to be connected with a front end of the recessed part34a, and the protruded part34dis formed on a front end side of the sheet-shaped coil34A. In the sheet-shaped coil34B, the protruded part34bis formed so as to be connected with a right end of the recessed part34a, the protruded part34cis formed so as to be connected with a left end of the recessed part34a, and the protruded part34dis formed on a left end side of the sheet-shaped coil34B. In the sheet-shaped coil34C, the protruded part34bis formed so as to be connected with a front end of the recessed part34a, the protruded part34cis formed so as to be connected with a rear end of the recessed part34a, and the protruded part34dis formed on a rear end side of the sheet-shaped coil34C. In the sheet-shaped coil34D, the protruded part34bis formed so as to be connected with a left end of the recessed part34a, the protruded part34cis formed so as to be connected with a right end of the recessed part34a, and the protruded part34dis formed on a right end side of the sheet-shaped coil34D.

Total three solder lands, i.e., two solder lands41and42as a first solder land and one solder land43as a second solder land are formed in the sheet-shaped coil34. The solder lands41through43are formed in a substantially rectangular shape. Further, the solder lands41through43are formed on an outer side face of the sheet-shaped coil34in the front and rear direction or the right and left direction. In other words, the solder lands41through43are formed on a right side face of the sheet-shaped coil34A, a front face of the sheet-shaped coil34B, a left side face of the sheet-shaped coil34C, and a rear face of the sheet-shaped coil34D. In addition, the solder lands41and42are formed on a lower end side of the sheet-shaped coil34and the solder land43is formed at a substantially center position in the upper and lower direction of the sheet-shaped coil34.

The solder lands41and42are formed on outer sides with respect to the protruded parts34band34cin the front and rear direction or the right and left direction. In other words, in the sheet-shaped coil34A, the solder land41is formed on a rear side with respect to the protruded part34band the solder land42is formed between the protruded part34cand the protruded part34d. In the sheet-shaped coil34B, the solder land41is formed on a right side with respect to the protruded part34band the solder land42is formed between the protruded part34cand the protruded part34d. In the sheet-shaped coil34C, the solder land41is formed on a front side with respect to the protruded part34band the solder land42is formed between the protruded part34cand the protruded part34d. In the sheet-shaped coil34D, the solder land41is formed on a left side of the protruded part34band the solder land42is formed between the protruded part34cand the protruded part34d.

The solder land43is formed at a position displaced from the solder lands41and42in the front and rear direction or the right and left direction. Specifically, in the sheet-shaped coil34A, the solder land43is formed on a front end side of the sheet-shaped coil34A and is disposed on a front side with respect to the solder land42. In the sheet-shaped coil34B, the solder land43is formed on a left end side of the sheet-shaped coil34B and is disposed on a left side with respect to the solder land42. In the sheet-shaped coil34C, the solder land43is formed on a rear end side of the sheet-shaped coil34C and is disposed on a rear side with respect to the solder land42. In the sheet-shaped coil34D, the solder land43is formed on a right end side of the sheet-shaped coil34D and is disposed on a right side with respect to the solder land42.

The solder lands41through43are soldered and fixed to solder lands (not shown) which are formed on the coil attaching part35a. The solder lands41and42are used for supplying electric power to the coil part33. The solder land41is electrically connected with one end of a copper wiring line structuring the coil part33and the solder land42is electrically connected with the other end of the copper wiring line structuring the coil part33. The solder land43is used to increase a fixed strength of the sheet-shaped coil34to the coil attaching part35aand thus the solder land43is not electrically connected with the coil part33.

A thickness of the flexible printed circuit board (FPC)35is thinner than a thickness of the sheet-shaped coil34. For example, the thickness of the FPC35is about one-fourth of the thickness of the sheet-shaped coil34. The FPC35is, as described above, provided with the coil attaching part35aand the external connection part35b. The coil attaching part35ais formed in a long and thin band shape having a roughly rectangular shape. A width in the upper and lower direction of the coil attaching part35a(in other words, a width in a short widthwise direction of the coil attaching part35aformed in a band shape) is set to be narrower than a width in the upper and lower direction of the sheet-shaped coil34. Further, the coil attaching part35ais structured of a first attaching part35cto which the sheet-shaped coil34A is attached, a second attaching part35dto which the sheet-shaped coil34B is attached, a third attaching part35eto which the sheet-shaped coil34C is attached, and a fourth attaching part35fto which the sheet-shaped coil34D is attached.

An end of the first attaching part35cin a longitudinal direction of the coil attaching part35ais connected with an end of the second attaching part35dand the other end of the first attaching part35cis connected with an end of the fourth attaching part35f. The other end of the second attaching part35din a longitudinal direction of the coil attaching part35ais connected with an end of the third attaching part35e. The coil attaching part35ais bent at a substantially right angle at three positions, i.e., a boundary between the first attaching part35cand the second attaching part35d, a boundary between the first attaching part35cand the fourth attaching part35f, and a boundary between the second attaching part35dand the third attaching part35eand, in this manner, the coil attaching part35ais bent in a substantially rectangular tube shape so as to be along an inner peripheral face of the tube part25b.

In the first attaching part35c, the second attaching part35d, the third attaching part35eand the fourth attaching part35f, recessed parts35gas a circuit board side recessed part are formed at positions corresponding to the recessed part34aof the sheet-shaped coil34. The recessed parts35gare formed on lower end sides of the first attaching part35c, the second attaching part35d, the third attaching part35eand the fourth attaching part35f. Further, the recessed part35gis formed so as to be recessed to an upper side and is formed in a substantially rectangular shape.

The first attaching part35c, the second attaching part35d, the third attaching part35eand the fourth attaching part35fare formed with protruded parts35hin a substantially rectangular shape which are protruded to an upper side. In the first attaching part35c, the protruded part35his formed on a front end side of the first attaching part35cand, in the second attaching part35d, the protruded part35his formed on a left end side of the second attaching part35dand, in the third attaching part35e, the protruded part35his formed on a rear end side of the third attaching part35eand, in the fourth attaching part35f, the protruded part35his formed on a right end side of the fourth attaching part35f. The protruded part35his formed with a solder land to which the solder land43of the sheet-shaped coil34is to be soldered and fixed, and the solder land43is soldered and fixed to the protruded part35h. In this embodiment, a width in the upper and lower direction of a portion of the coil attaching part35awhere the protruded part35his formed is set to be narrower than a width in the upper and lower direction of the sheet-shaped coil34.

The protruded part35hformed in the third attaching part35eis formed with a through-hole35jin a circular shape. Further, a through-hole35kin an elliptical shape is formed on an upper side with respect to the recessed part35gof the fourth attaching part35f. A portion of the fourth attaching part35fwhere the through-hole35kis formed is protruded toward an upper side.

The external connection part35bis formed in a band shape. The external connection part35bis connected with a lower end on a front end side of the first attaching part35cand is extended from the lower end on the front end side of the first attaching part35c. In other words, the external connection part35bis extended from a substantially center position in the longitudinal direction of the coil attaching part35ain a state that the coil attaching part35abent in a substantially rectangular tube shape is developed. The external connection part35bis connected with the FPC21as described above.

The sheet-shaped coil34is attached to the coil attaching part35aso that its lower end side and the lower end side of the coil attaching part35aare substantially coincided with each other. Further, the sheet-shaped coil34is attached to the coil attaching part35aso that the recessed part34aand the recessed part35gare overlapped with each other in the front and rear direction or the right and left direction. In a state that the sheet-shaped coil34is attached to the coil attaching part35a, inner side faces of the protruded parts35hin the front and rear direction or the right and left direction are contacted with upper end sides of outer side faces of the sheet-shaped coils34in the front and rear direction or the right and left direction. Further, in the state that the sheet-shaped coil34is attached to the coil attaching part35a, the protruded parts34bthrough34dare slightly protruded to a lower side with respect to a lower end of the coil attaching part35a.

Four sheet-shaped coils34are attached to an inner peripheral face of the coil attaching part35abent in a substantially rectangular tube shape in a separated state from each other with a predetermined gap space therebetween in a longitudinal direction of the coil attaching part35a. In this embodiment, a boundary between the first attaching part35cand the second attaching part35dis located in a gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34B, a boundary between the first attaching part35cand the fourth attaching part35fis located in a gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34D, and a boundary between the second attaching part35dand the third attaching part35eis located in a gap space portion between the sheet-shaped coil34B and the sheet-shaped coil34C. The coil attaching part35ais formed in a substantially rectangular tube shape by bending at a substantially right angle at three positions, i.e., a gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34B, a gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34D, and a gap space portion between the sheet-shaped coil34B and the sheet-shaped coil34C.

In this embodiment, in order to attach the sheet-shaped coils34to the coil attaching part35a, the coil attaching part35aand the sheet-shaped coils34are fixed to a predetermined jig. The through-holes35jand35kformed in the coil attaching part35aare used for determining the position of the coil attaching part35awith respect to the jig. Further, the recessed parts34aof the sheet-shaped coils34and the recessed parts35gof the coil attaching part35aare used for aligning the sheet-shaped coils34with the coil attaching part35a.

An outer peripheral face of the coil attaching part35awhich is bent in a substantially rectangular tube shape so as to be along an inner peripheral face of the tube part25bis attached to the inner peripheral face of the tube part25b. As described above, the width in the upper and lower direction of the coil attaching part35ais set to be narrower than the width in the upper and lower direction of the sheet-shaped coil34. Further, the sheet-shaped coils34are attached to the coil attaching part35aso that their lower end sides are substantially coincided with the lower end side of the coil attaching part35a. Therefore, as shown inFIG. 2, a gap space “S” corresponding to the thickness of the coil attaching part35ais formed between an upper end side of the sheet-shaped coil34and the inner peripheral faces of the tube part25b. In this embodiment, the sheet-shaped coil34and the coil attaching part35aare fixed to the inner peripheral face of the tube part25bby an adhesive and the gap space “S” is utilized as an adhesive reservoir where the adhesive for fixing the sheet-shaped coils34and the coil attaching part35ato the inner peripheral face of the tube part25bis retained.

When the coil attaching part35ain a state that the sheet-shaped coils34have been attached is to be attached to the inner peripheral face of the tube part25b, first, an adhesive is applied to the inner peripheral face of the tube part25b. Further, the coil attaching part35ais bent in a substantially rectangular tube shape at three positions, i.e., the boundary between the first attaching part35cand the second attaching part35d, the boundary between the first attaching part35cand the fourth attaching part35f, and the boundary between the second attaching part35dand the third attaching part35e. In this case, in order to smoothly insert the coil attaching part35ainto the inner peripheral side with respect to the tube part25b, the coil attaching part35ais bent in a substantially rectangular tube shape so that an outward form of the coil attaching part35abecomes smaller than the inner peripheral face of the tube part25b. After that, the coil attaching part35ais inserted from the lower end side of the tube part25binto the inner peripheral side of the tube part25band then the coil attaching part35ais fixed to the inner peripheral face of the tube part25b.

(Principal Effects in this Embodiment)

As described above, in this embodiment, the coil attaching part35awhich is fixed to the inner peripheral face of the tube part25bof the case body25is bent at a substantially right angle at three positions, i.e., the gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34B, the gap space portion between the sheet-shaped coil34A and the sheet-shaped coil34D, and the gap space portion between the sheet-shaped coil34B and the sheet-shaped coil34C and thereby the coil attaching part35ais formed in a substantially rectangular tube shape. Further, in this embodiment, the thickness of the coil attaching part35ais thinner than the thickness of the sheet-shaped coil34. In other words, in this embodiment, the coil attaching part35ais bent at portions which are thinner than the sheet-shaped coil34. Therefore, in this embodiment, the shape of the coil attaching part35abent in a substantially rectangular tube shape is easily stabilized and the coil attaching part35abent in a substantially rectangular tube shape is easily handled. Accordingly, in this embodiment, attaching work of the sheet-shaped coils34and the coil attaching part35ato the tube part25bcan be performed easily.

Further, in this embodiment, the thickness of the coil attaching part35ais thinner than the thickness of the sheet-shaped coil34and thus, even when the coil attaching part35ais bent in a substantially rectangular tube shape, cracking is hard to be occurred in bent parts of the coil attaching part35a. Therefore, in this embodiment, deterioration in quality of an image photographed by the optical device1is hard to be occurred by a foreign matter generated due to cracking of the coil attaching part35a.

In this embodiment, the gap space “S” having a width of the thickness of the coil attaching part35ais formed between an upper end side of the sheet-shaped coil34and an inner peripheral face of the tube part25band the gap space “S” is utilized as an adhesive reservoir for retaining adhesive for fixing the sheet-shaped coils34and the coil attaching part35ato the inner peripheral face of the tube part25b. Therefore, in this embodiment, attaching strength of the sheet-shaped coils34and the coil attaching part35ato the tube part25bcan be increased.

Further, in this embodiment, the sheet-shaped coils34are attached to the coil attaching part35aso that the gap space “S” is formed between an upper end side of the sheet-shaped coil34and the inner peripheral faces of the tube part25b. Therefore, in a case that, after an adhesive is applied to the inner peripheral face of the tube part25b, the coil attaching part35ais inserted into the inner peripheral side of the tube part25bfrom the lower end side of the tube part25band the coil attaching part35ais fixed to the inner peripheral face of the tube part25b, a problem can be prevented that the adhesive applied to the inner peripheral face of the tube part25bis scraped by the coil attaching part35aand pushed out toward the bottom part25aside. Accordingly, in this embodiment, a trouble such that the adhesive applied to the inner peripheral face of the tube part25bis adhered to other members or a jig can be prevented.

In this embodiment, the protruded parts35hprotruding to an upper side are formed in the coil attaching part35aand the inner side faces of the protruded parts35hin the front and rear direction or the right and left direction are contacted with upper end sides of the outer side faces of the sheet-shaped coils34in the front and rear direction or the right and left direction. Therefore, in this embodiment, inclination (slanting) with respect to the “Z-X” plane or the “Y-Z” plane of the sheet-shaped coil34which is disposed substantially parallel to the “Z-X” plane or the “Y-Z” plane can be suppressed by the protruded part35h. Especially, in this embodiment, a solder land to which the solder land43of the sheet-shaped coil34is to be soldered and fixed is formed in the protruded part35hand the solder land43is soldered and fixed to the protruded part35h. Therefore, inclination of the sheet-shaped coil34can be suppressed effectively with respect to the “Z-X” plane or the “Y-Z” plane. Accordingly, in this embodiment, a gap space between the drive magnet38and the coil part33can be maintained appropriately. Further, a gap space “S” having a width of the thickness of the coil attaching part35acan be formed appropriately between the upper end side of the sheet-shaped coil34and the inner peripheral face of the tube part25b.

In this embodiment, in addition to the solder lands41and42for supplying electric power to the coil parts33, the solder land43is soldered and fixed to the solder land formed in the coil attaching part35a. Therefore, in this embodiment, fixed strength of the sheet-shaped coil34to the coil attaching part35acan be increased.

In this embodiment, the external connection part35bis extended from a substantially center position in the longitudinal direction of the coil attaching part35ain a state that the coil attaching part35abent in a substantially rectangular tube shape is developed. Therefore, in this embodiment, a plurality of wiring patterns connected with four coil parts33are diverged toward respective both end parts of the coil attaching part35afrom a connected portion of the external connection part35bwith the coil attaching part35a. Accordingly, in this embodiment, the number of wiring patterns arranged in the upper and lower direction can be reduced in the coil attaching part35aand, as a result, the width of the coil attaching part35ain the upper and lower direction can be made narrow.

In this embodiment, the protruded parts34bthrough34dwhich are protruded toward a lower side are formed in the sheet-shaped coil34. Therefore, in this embodiment, even when the holding side fixed part of the plate spring6is fixed to the upper end of the side face part26bof the lower case body26by welding on a lower side with respect to the sheet-shaped coil34, a distance between a welded portion of the holding side fixed part to the side face part26band the main body portion of the sheet-shaped coil34can be secured by utilizing the protruded parts34bthrough34d. Accordingly, in this embodiment, in a case that the holding side fixed part is to be welded to the side face part26b, even when sparks are scattered to the main body portion of the sheet-shaped coil34, the main body portion of the sheet-shaped coil34is prevented from being damaged. Further, in this embodiment, a short circuit between the soldered portion of the sheet-shaped coil34to the coil attaching part35aand the welded portion of the holding side fixed part to the side face part26bcan be prevented from being formed.

In this embodiment, the recessed part34ais formed in the sheet-shaped coil34and the recessed part35gis formed in the coil attaching part35a. Further, in this embodiment, the recessed part34aand the recessed part35gare used for aligning the sheet-shaped coil34with the coil attaching part35a. Therefore, in this embodiment, when the sheet-shaped coil34is to be attached to the coil attaching part35a, the sheet-shaped coil34is easily aligned with the coil attaching part35a.

OTHER EMBODIMENTS

Although the present invention has been shown and described with reference to a specific embodiment, various changes and modifications will be apparent to those skilled in the art from the teachings herein.

In the embodiment described above, the drive magnets38are attached to an outer peripheral side of the movable module4and the sheet-shaped coils34and the FPC35are attached to an inner peripheral face of the tube part25bof the case body25. However, the present invention is not limited to this embodiment. For example, it may be structured that the drive magnets38are attached to an inner peripheral face of the tube part25band the sheet-shaped coils34and the coil attaching part35aare attached to an outer peripheral side of the movable module4. In this case, for example, the movable module4includes a cover member having a substantially rectangular tube shape which structures side faces in the front and rear direction and the right and left direction of the movable module4. The sheet-shaped coils34are attached to an outer peripheral face of the coil attaching part35a, which is bent in a substantially rectangular tube shape so as to be along an outer peripheral face of the cover member, and an inner peripheral face of the coil attaching part35abent in a substantially rectangular tube shape is attached to the outer peripheral face of the cover member. Also in this case, similar effects to the embodiment described above can be obtained.

In the embodiment described above, four sheet-shaped coils34each of which is provided with one coil part33is attached to the coil attaching part35a. However, the present invention is not limited to this embodiment. For example, two sheet-shaped coils each of which is provided with two coil parts33may be attached to the coil attaching part35a. In this case, two sheet-shaped coils are attached to the coil attaching part35awith a predetermined gap space therebetween in a longitudinal direction of the coil attaching part35a. Further, in this case, the coil attaching part35ais bent at a substantially right angle in a gap space portion between two sheet-shaped coils, and the sheet-shaped coil and the coil attaching part35aare bent at a substantially right angle in a predetermined portion between two coil parts33of one sheet-shaped coil and thereby the coil attaching part35ato which the sheet-shaped coils are attached is formed in a substantially rectangular tube shape. Also in this case, in comparison with the optical unit described in the above-mentioned Patent Literature 1, attaching work of the sheet-shaped coils to the tube part25bof the case body25is easy and, in addition, attaching strength of the sheet-shaped coils to the tube part25bcan be increased.

In the embodiment described above, the sheet-shaped coil34is attached to the coil attaching part35aso that its lower end side is substantially coincided with the lower end side of the coil attaching part35a. However, the present invention is not limited to this embodiment. For example, the sheet-shaped coil34may be attached to the coil attaching part35aso that the coil attaching part35ais disposed at its center position in the upper and lower direction. In this case, in addition to the protruded part35hor instead of providing the protruded part35h, a protruded part protruding to a lower side from the coil attaching part35amay be formed in the coil attaching part35a.

In the embodiment described above, one solder land43is formed in the sheet-shaped coil34for increasing fixed strength of the sheet-shaped coil34to the coil attaching part35a. However, the present invention is not limited to this embodiment. For example, two or more solder lands may be formed in the sheet-shaped coil34for increasing fixed strength of the sheet-shaped coil34to the coil attaching part35a. Further, in a case that fixed strength of the sheet-shaped coil34to the coil attaching part35ais secured, no solder land43may be formed in the sheet-shaped coil34.

In the embodiment described above, the solder lands41and42are formed on a lower end side of the sheet-shaped coil34. However, the present invention is not limited to this embodiment. For example, one of the solder lands41and42is formed on a lower end side of the sheet-shaped coil34and the other of the solder lands41and42may be formed on an upper end side of the sheet-shaped coil34. In this case, the solder land43may be formed on an upper end side of the sheet-shaped coil34, may be formed on a lower side of the sheet-shaped coil34, or may be formed at a substantially center position in the upper and lower direction of the sheet-shaped coil34. Further, in this case, the solder lands41and42may be formed at the same position as each other in the front and rear direction or the right and left direction or may be formed at positions displaced from each other in the front and rear direction or the right and left direction. When the solder lands41and42are formed at the same position as each other in the front and rear direction or the right and left direction, the solder land43is formed at a position displaced from the solder lands41and42in the front and rear direction or the right and left direction. Further, when the solder lands41and42are formed at positions displaced from each other in the front and rear direction or the right and left direction, the solder land43may be formed at the same position as the solder land41or the solder land42in the front and rear direction or the right and left direction, or may be formed at a position displaced from the solder lands41and42in the front and rear direction or the right and left direction.

In the embodiment described above, the optical device1is formed in a substantially square shape when viewed in the optical axis direction. However, the optical device1may be formed in a substantially rectangular shape when viewed in the optical axis direction. Further, the optical device1may be formed in other polygonal shapes when viewed in the optical axis direction. In this case, the tube part25bof the case body25is formed in a multi-angular tube shape depending on the shape of the optical device1. Further, a plurality of sheet-shaped coils34depending on the shape of the tube part25bis attached to a coil attaching part35a. The coil attaching part35ato which a plurality of the sheet-shaped coils34is attached is bent in a multi-angular tube shape so as to be along an inner peripheral face of the tube part25b. Further, the optical device1may be formed in a circular shape or an elliptic shape when viewed in the optical axis direction.

In the embodiment described above, the lens drive mechanism30is a so-called voice coil motor which includes the lens drive coils32and the drive magnets38. However, the present invention is not limited to this embodiment. For example, the lens drive mechanism30may include a piezoelectric element or a shape-memory alloy for moving a lens in an optical axis direction. Further, in the embodiment described above, the optical device1is provided with an autofocus function but the optical device1may be provided with no autofocus function. In other words, the optical device1may include no lens drive mechanism30.

In the embodiment described above, as an example, an embodiment of the present invention is the optical device1in which the movable module4is a movable part and the support body5is a holding part. However, the structure of at least an embodiment of the present invention may be applied to an optical device other than the optical device1. For example, the structure of at least an embodiment of the present invention may be applied to the movable module4in which the movable body8is a movable part, the holding body9movably holding the movable body8in the optical axis direction is a holding part, and the lens drive mechanism30for driving the movable body8in the optical axis direction is a drive mechanism.