JP2011053600A - Lens driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a specific configuration of a lens driving device capable of driving a lens in an optical axis direction and correcting a camera-shake. <P>SOLUTION: The lens driving device having an substantially quadrangular shape when viewed from the optical axis direction includes: a movable member 2 which is movable together with the lens; a stator which holds the movable member 2; and a driving mechanism 4 for driving the movable member 2. The movable member 2 is formed so that its outer shape is substantially quadrangular when viewed from the optical axis direction. The driving mechanism 4 includes: a first driving coil 11 which is wound around the outer circumferential surface of the movable member 2; four second driving coils 12 which are wound and formed in an air core shape and arranged at four corners of the movable member 2, respectively, along the outer circumferential surface of the movable member 2, while the second driving coils 12 are bent substantially at 90°; and four driving magnets 13 which are arranged in substantially parallel with four sides of the lens driving device, respectively. The driving magnets 13 are arranged to face the first driving coil 11 and the second driving coils 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a moving lens body that moves in the optical axis direction while holding a plurality of lenses, and a moving lens via two leaf springs 2. Description of the Related Art A lens driving device including a fixed body that holds a body in a movable manner is known (for example, see Patent Document 1). In the lens driving device described in Patent Document 1, a driving coil is wound around the outer periphery of a cylindrical sleeve constituting a moving lens body. In this lens driving device, four magnets are arranged so as to face the outer peripheral surface of the driving coil.

JP 2008-58659 A

  When shooting using a camera mounted on a mobile device such as a mobile phone, shake tends to occur. On the other hand, in recent years, in the market of cameras mounted on mobile phones and the like, there is an increasing demand for higher functionality of cameras, and there is a demand for cameras capable of correcting shake during shooting. In recent years, in the market of cameras used for mobile phones and the like, the demand for higher pixels has further increased, and in order to meet the demand for higher pixels, the amount of tilt of the optical axis of the lens mounted on the camera ( The allowable range of (tilt amount) is becoming narrower.

  Accordingly, an object of the present invention is to propose a specific configuration of a lens driving device capable of driving a lens in the optical axis direction and correcting shake. Another object of the present invention is to propose a lens driving device capable of suppressing the inclination of the optical axis of the lens.

  In order to solve the above problems, a lens driving device according to the present invention is a lens driving device having a substantially square shape when viewed from the optical axis direction of the lens, and is a movable body that holds and moves the lens. And a fixed body for movably holding the movable body and a drive mechanism for driving the movable body, and the movable body is formed so that the outer shape when viewed from the optical axis direction is a substantially square shape. The driving mechanism includes a first driving coil wound around the outer peripheral surface of the movable body and each of the four corners of the movable body formed in an air-core shape and bent at approximately 90 °. And four second driving coils arranged along the outer peripheral surface of the movable body, and four substantially plate-like driving magnets arranged substantially in parallel with each of the four side surfaces of the lens driving device. The driving magnet includes a first driving coil and a second driving coil. Characterized in that it is arranged to Le facing.

  In the present invention, for example, the second driving coil is wound in a substantially rectangular shape including two first sides that are substantially parallel to the optical axis direction and two second sides that are substantially orthogonal to the optical axis direction. The first side portion of the driving magnet is opposed to the first driving coil and the second driving coil, while being rotated and bent at about 90 ° at a predetermined position of the second side portion. It faces one magnetic pole. In the present invention, for example, the second driving coil has a substantially rectangular shape including two first side portions that are substantially parallel to the optical axis direction and two second side portions that are substantially orthogonal to the optical axis direction. And is bent at approximately 90 ° at a predetermined position of the second side portion, and the second side portion is formed between the first driving coil and the second driving coil of the driving magnet. It faces one magnetic pole on the facing surface.

  In the lens driving device of the present invention, the driving mechanism includes a first driving coil wound around the outer peripheral surface of the movable body, and a substantially plate-like 4 disposed substantially parallel to each of the four side surfaces of the lens driving device. Each of the driving magnets, and the driving magnet is disposed so as to face the first driving coil. Therefore, the lens held by the movable body can be driven in the optical axis direction by the first driving coil and the driving magnet.

  Further, in the present invention, the drive mechanism is formed by winding four second drive coils that are formed at the four corners of the movable body in a state where the drive mechanism is wound in an air-core shape and is bent at approximately 90 °. The drive magnet is disposed so as to face the second drive coil. Therefore, the first side portion of the second driving coil that is substantially parallel to the optical axis direction is opposed to one magnetic pole on the surface of the driving magnet that faces the first driving coil and the second driving coil. Then, it becomes possible to generate a driving force in a direction substantially orthogonal to the optical axis direction between the driving magnet and the first side portion, and the movable body is held in a direction substantially orthogonal to the optical axis direction. It becomes possible to drive the lens. Therefore, in the present invention, by driving the lens in a direction substantially orthogonal to the optical axis direction, it is possible to correct shake when shooting is performed with a camera equipped with a lens driving device.

  Further, in the present invention, the drive mechanism is formed by winding four second drive coils that are formed at the four corners of the movable body in a state where the drive mechanism is wound in an air-core shape and is bent at approximately 90 °. The drive magnet is disposed so as to face the second drive coil, and therefore, the second side portion of the second drive coil that is substantially orthogonal to the optical axis direction is the first of the drive magnet. If it faces one magnetic pole on the surface facing the driving coil and the second driving coil, it is possible to generate a driving force in the optical axis direction between the driving magnet and the second side portion. Become. That is, it becomes possible to generate a driving force in the optical axis direction at the four corners of the movable body. Therefore, it is possible to correct the inclination of the optical axis of the lens held by the movable body by changing the magnitude of the driving force generated at each of the four corners of the movable body. Therefore, in the present invention, it is possible to suppress the inclination of the optical axis of the lens by appropriately correcting the inclination of the optical axis of the lens. In the present invention, since it is possible to correct the tilt of the optical axis of the lens, it is also possible to correct this shake when shake occurs in the camera in which the lens driving device is mounted.

  In the present invention, the opposing surface of the driving magnet is magnetized to a single pole and magnetized to the same magnetic pole, and each of the two first sides constituting one driving coil is a lens driving device. It is preferable to face each of the facing surfaces of the drive magnets adjacent in the circumferential direction. If comprised in this way, the driving force to the direction substantially orthogonal to an optical axis direction can be generated in the two 1st edge parts which comprise one 2nd coil for a drive. Therefore, it becomes possible to increase the driving force of the lens in a direction substantially orthogonal to the optical axis direction.

  In the present invention, of the four second driving coils, one of the two second driving coils arranged on the diagonal line of the movable body when viewed from the optical axis direction is sequentially wound by one conductor. The remaining two second driving coils are formed by sequentially winding the other one conducting wire, or each of the four second driving coils is Each of the four conducting wires is formed by being wound, and two of the two second driving coils are arranged on the diagonal line of the movable body when viewed from the optical axis direction. It is preferable that the driving coils are connected in series and the remaining two second driving coils are connected in series. If comprised in this way, it will become possible to simplify the structure of the current supply circuit for supplying an electric current to four 2nd coils for a drive. In addition, current supply control for supplying current to the four second driving coils is facilitated.

  In the present invention, the lens driving device includes two first driving coils arranged at a predetermined interval in the optical axis direction, and two magnetic poles different in the optical axis direction are adjacent to each other on the opposing surface of the driving magnet. Each of the two first driving coils is arranged in such a manner as to face each of the two magnetic poles on the opposing surface of the driving magnet, and constitutes one second driving coil. Each of the second side portions is preferably opposed to each of the two magnetic poles on the opposing surface of the drive magnet. If comprised in this way, the drive force to an optical axis direction can be generated in the two 2nd edge parts which comprise one 2nd coil for a drive. Therefore, the driving force in the optical axis direction generated at the four corners of the movable body can be increased, and the tilt of the optical axis of the lens can be corrected more appropriately. Also, with this configuration, each of the two first driving coils is disposed so as to oppose each of the two magnetic poles on the opposing surface of the driving magnet, thereby increasing the permeance coefficient of the lens driving device. Is possible.

  In the present invention, each of the four second driving coils is preferably formed by winding each of the four conductive wires. Further, in this case, the four second driving coils are supplied to each of the two second driving coils arranged on the diagonal line of the movable body when viewed from the optical axis direction. Preferably, the difference in current magnitude is controlled, and the difference in magnitude of current supplied to each of the remaining two second drive coils is controlled. If comprised in this way, the predetermined 1st direction orthogonal to an optical axis direction is made into an axial direction by two 2nd drive coils arrange | positioned on the diagonal of a movable body when it sees from an optical axis direction. The inclination of the optical axis of the lens is corrected and the inclination of the optical axis of the lens with the second direction perpendicular to the optical axis direction and the first direction as the axial direction is corrected by the remaining two second driving coils. It becomes possible to correct. Therefore, it is possible to correct the inclination of the optical axis in all directions by the four second driving coils.

  As described above, in the lens driving device of the present invention, it is possible to drive the lens in the optical axis direction and to correct shake. In the lens driving device of the present invention, it is possible to suppress the inclination of the optical axis of the lens.

It is a perspective view of the lens drive device concerning an embodiment of the invention. It is a perspective view which shows the state which removed the case body from the lens drive device shown in FIG. It is a top view which shows schematic structure when a case body is removed from the lens drive device shown in FIG. It is a figure for demonstrating the arrangement | positioning relationship of the 1st drive coil and drive magnet from the EE direction of FIG. It is a figure for demonstrating the arrangement | positioning relationship of the 2nd drive coil and drive magnet from the EE direction of FIG. It is a figure for demonstrating the arrangement | positioning relationship between the 1st drive coil and drive magnet concerning other embodiment of this invention from a side surface. It is a figure for demonstrating the arrangement | positioning relationship between the 2nd drive coil and drive magnet concerning other embodiment of this invention from a side surface.

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

(Configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state where the case body 8 is removed from the lens driving device 1 shown in FIG. FIG. 3 is a plan view showing a schematic configuration when the case body 8 is removed from the lens driving device 1 shown in FIG. FIG. 4 is a view for explaining the arrangement relationship between the first drive coil 11 and the drive magnet 13 from the EE direction in FIG. 3. FIG. 5 is a diagram for explaining the positional relationship between the second drive coil 12 and the drive magnet 13 from the EE direction in FIG. 3.

  The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone or the like, and has a shake correction function for correcting camera shake. As shown in FIG. 1, the lens driving device 1 is formed in a substantially quadrangular prism shape as a whole. Specifically, the lens driving 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. In this embodiment, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square.

  In the camera on which the lens driving device 1 of this embodiment is mounted, an image sensor (not shown) is arranged on the Z2 direction side in FIGS. 1 and 2 and the like, and is arranged on the Z1 direction side in FIGS. Subject is photographed. Therefore, in the following description, the Z1 direction side is the subject side (object side), and the Z2 direction side is the anti-subject side (imaging element side, image side). In the following description, two directions orthogonal to the optical axis L and orthogonal to each other are defined as an X direction and a Y direction. In this embodiment, the four side surfaces of the lens driving device 1 are parallel to the X direction or the Y direction.

  As shown in FIGS. 1 to 3, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in an optical axis direction and a direction substantially orthogonal to the optical axis direction, an optical axis direction, and light. A fixed body 3 that holds the movable body 2 so that the movable body 2 can move in a direction substantially orthogonal to the axial direction, and a drive mechanism 4 that drives the movable body 2 are provided. The movable body 2 is movably held on the fixed body 3 via a leaf spring (not shown).

  The movable body 2 includes a sleeve 7 that holds a lens holder 6 to which a plurality of lenses are fixed. The fixed body 3 includes a case body 8 that forms a side surface of the lens driving device 1 and a base member 9 that forms an end surface of the lens driving device 1 on the side opposite to the subject.

  The lens holder 6 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed on the inner peripheral side thereof. The sleeve 7 is formed of, for example, a resin material and is formed in a substantially rectangular tube shape, and the lens holder 6 is fixed to the inner peripheral side thereof. That is, the sleeve 7 is formed so that the outer shape when viewed from the optical axis direction is a substantially square shape. In this embodiment, the sleeve 7 is formed so that the outer shape when viewed from the optical axis direction is substantially square. More specifically, as shown in FIG. 3, the sleeve 7 is formed so that the outer shape when viewed from the optical axis direction is a substantially square shape having chamfered portions at four corners. In this embodiment, the outer shape of the sleeve 7 is the outer shape of the movable body 2, and the movable body 2 is also formed so that the outer shape when viewed from the optical axis direction is a substantially square shape having chamfered portions at the four corners. Has been.

  The case body 8 is formed of a magnetic material, and is formed in a substantially square cylindrical shape with a bottom having a bottom portion 8a and a cylindrical portion 8b. A circular through hole 8c is formed at the center of the bottom 8a disposed on the subject side. The case body 8 is disposed so as to surround the outer peripheral side of the movable body 2 and the drive mechanism 4.

  The base member 9 is formed of, for example, a resin material and is substantially square. The base member 9 is attached to the opposite side of the case body 8.

  The drive mechanism 4 includes one first drive coil 11 wound around the outer peripheral surface of the movable body 2, four second drive coils 12 disposed at each of the four corners of the movable body 2, and a lens. Four drive magnets 13 are provided which are arranged substantially parallel to each of the four side surfaces of the drive device 1.

  The second driving coil 12 is a flat coil formed by being wound in a substantially rectangular air-core shape, and includes two short side portions 12a that are substantially parallel to each other and substantially parallel to each other from the short side portion 12a. And two long side portions 12b. Further, the second drive coil 12 is formed by being bent at approximately 90 ° at approximately the center position of the long side portion 12b.

  The second driving coil 12 is fixed to the four corners of the movable body 2. Specifically, the second drive coil 12 is fixed to the movable body 2 so as to follow the outer peripheral surface of the movable body 2 at the four corners of the movable body 2. That is, the second drive is performed so that the short side portion 12a is substantially parallel to the optical axis direction and the long side portion 12b is substantially orthogonal to the optical axis direction (that is, substantially parallel to the X direction or the Y direction). The working coil 12 is fixed to the movable body 2. Further, when viewed from the direction orthogonal to the optical axis direction, the second driving coil 12 has substantially the center of the first driving coil 11 in the optical axis direction and the center of the short side portion 12a in the optical axis direction. It is being fixed to the movable body 2 so that it may correspond. The short side part 12a of this form is a 1st side part substantially parallel to an optical axis direction, and the long side part 12b is a 2nd side part substantially orthogonal to an optical axis direction.

  Hereinafter, when the four second driving coils 12 are distinguished from each other, the second driving coils 12 are referred to as second driving coils 12A to 12D. As shown in FIG. 3, the second driving coils 12 </ b> A to 12 </ b> D are arranged in this order in the clockwise direction in the circumferential direction of the lens driving device 1 around the optical axis L. Specifically, the optical axis L is sandwiched in a first direction V (first direction V) inclined by approximately 45 ° with respect to the X direction and the Y direction on the XY plane formed from the X direction and the Y direction. The second drive coils 12 </ b> A and 12 </ b> C are disposed, and the second drive coil 12 </ b> A and the second drive coil 12 </ b> C are disposed on the diagonal line of the sleeve 7. The second driving coils 12B and 12D are arranged so as to sandwich the optical axis L in a second direction W (second direction W) substantially orthogonal to the first direction V in the XY plane, The second drive coil 12 </ b> B and the second drive coil 12 </ b> D are arranged on the diagonal line of the sleeve 7.

  In this embodiment, the second drive coil 12A and the second drive coil 12C are formed by winding one conductive wire in sequence. Further, the second driving coil 12B and the second driving coil 12D are formed by sequentially winding another one conducting wire.

  The drive magnet 13 is formed in a substantially rectangular thin plate shape. The drive magnet 13 is magnetized so that the surfaces thereof have different magnetic poles. That is, the drive magnet 13 is magnetized so that one surface of the drive magnet 13 is an S pole and the other surface of the drive magnet 13 is an N pole. That is, both surfaces of the drive magnet 13 are magnetized to a single pole.

  Each of the four drive magnets 13 is fixed to the inner side of each of the four side surfaces constituting the cylindrical portion 8 b of the case body 8. Specifically, 4 so that the drive magnet 13 is substantially parallel to the side surface of the cylindrical portion 8b, and the longitudinal direction of the drive magnet 13 is substantially parallel to the X direction or the Y direction. Each of the driving magnets 13 is fixed to the inner surface of the cylindrical portion 8b. Each of the four drive magnets 13 is fixed to the inner surface of the cylindrical portion 8b so that the first drive coil 11 and the second drive coil 12 and the drive magnet 13 face each other. Further, the four drive magnets 13 are provided with the cylindrical portion 8b so that the opposing surfaces 13a of the four drive magnets 13 facing the first drive coil 11 and the second drive coil 12 have the same magnetic pole. It is fixed to the inner surface of the. For example, the four drive magnets 13 are fixed to the inner surface of the cylindrical portion 8b so that the magnetic poles of the four opposing surfaces 13a are all S poles.

  In the following description, when the four drive magnets 13 are distinguished from each other, the drive magnets 13 are referred to as drive magnets 13A to 13D. As shown in FIG. 3, the driving magnets 13 </ b> A to 13 </ b> D are arranged in this order in the clockwise direction in the circumferential direction of the lens driving device 1 around the optical axis L. Specifically, the drive magnets 13A and 13C are arranged so as to face each other in the X direction, and the drive magnets 13B and 13D are arranged so as to face each other in the Y direction.

  As described above, the four drive magnets 13 are fixed to the cylindrical portion 8 b so as to face the first drive coil 11. Moreover, all the opposing surfaces 13a are magnetized by the same magnetic pole. Therefore, when a current is supplied to the first driving coil 11, a driving force in the optical axis direction is generated between the first driving coil 11 and the driving magnet 13. That is, when a current is supplied to the first driving coil 11, a driving force in the optical axis direction is generated in the movable body 2.

  Further, as described above, the four drive magnets 13 are fixed to the cylindrical portion 8 b so as to face the second drive coil 12. Specifically, the four short side portions 12a constituting one second driving coil 12 are respectively opposed to the opposing surfaces 13a of the driving magnets 13 adjacent in the circumferential direction. A plurality of driving magnets 13 are fixed to the cylindrical portion 8b. That is, each of the two short sides 12a constituting the second drive coil 12A is opposed to each of the opposed surfaces 13a of the drive magnets 13D and 13A, and the two short sides 12a constituting the second drive coil 12B are formed. Each of the short side portions 12a is opposed to each of the opposing surfaces 13a of the drive magnets 13A and 13B, and each of the two short side portions 12a constituting the second drive coil 12C is the drive magnets 13B and 13C. Each of the two short sides 12a constituting the second drive coil 12D is opposed to each of the opposed surfaces 13a of the drive magnets 13C and 13D.

  Since the opposing surfaces 13a of the four drive magnets 13 are all magnetized to the same magnetic pole, when current is supplied to the second drive coils 12A and 12C, the short sides of the second drive coils 12A and 12C are short. A driving force in the first direction V is generated in the movable body 2 by the resultant force of the driving force generated between the side portion 12 a and the driving magnet 13. Further, when a current is supplied to the second drive coils 12B and 12D, the movable body 2 is generated by the resultant force of the drive force generated between the short side portion 12a of the second drive coils 12B and 12D and the drive magnet 13. Causes a driving force in the second direction W.

  In this embodiment, as shown in FIG. 5, since a part of the long side portion 12b and the driving magnet 13 are opposed to each other, when a current is supplied to the second driving coil 12, the long side portion Although a driving force is generated in the optical axis direction in 12b and the driving magnet 13, the opposing surface 13a of the driving magnet 13 is magnetized to a single pole, so that one second driving coil 12 is configured. The directions of the driving force generated between the two long side portions 12b and the driving magnet 13 are different from each other. That is, the driving force in the optical axis direction generated between the long side portion 12b arranged on the subject side and the driving magnet 13 is between the long side portion 12b arranged on the non-subject side and the driving magnet 13. Is offset by the driving force in the direction of the optical axis.

  In the present embodiment, as shown in FIG. 4, the width of the drive magnet 13 in the optical axis direction is wider than the width of the first drive coil 11 in the optical axis direction, and the movable body in the optical axis direction. The entire region of the first movable coil 11 in the optical axis direction is opposed to the facing surface 13 a of the driving magnet 13 in the entire movable range of 2. In this embodiment, as shown in FIG. 5, the width of the driving magnet 13 in the optical axis direction is longer than the length of the short side portion 12a in the optical axis direction, and the movable body 2 in the optical axis direction is In the entire movable range, the entire short side portion 12 a in the optical axis direction is opposed to the facing surface 13 a of the driving magnet 13. Furthermore, in this embodiment, the entire region of the short side portion 12a in the X direction or the Y direction is opposed to the facing surface 13a of the driving magnet 13 in the entire movable range of the movable body 2 in the direction orthogonal to the optical axis direction. It has become.

  In the lens driving device 1 configured as described above, the movable body 2 moves in the optical axis direction and the focus is adjusted when shooting is performed with a camera on which the lens driving device 1 is mounted. Further, when a camera shake is detected by a sensor (not shown) such as a lens drive device 1 or a gyroscope (angular velocity sensor) mounted on the camera, based on the detection result of this sensor, A current is supplied to the second drive coil 12, and the movable body 2 moves in the first direction V and / or the second direction W, and the shake is corrected.

(Main effects of this form)
As described above, in the present embodiment, the first driving coil 11 wound around the outer peripheral surface of the movable body 2 and the driving magnet 13 are disposed so as to face each other, and the facing surface 13a of the driving magnet 13 is Both are magnetized on the same magnetic pole. Therefore, in this embodiment, a driving force in the optical axis direction can be generated between the first driving coil 11 and the driving magnet 13, and the lens held by the movable body 2 is driven in the optical axis direction. be able to.

  Further, in this embodiment, the short side portion 12a of the second driving coil 12 arranged at the four corners of the movable body 2 and the driving magnet 13 are arranged to face each other, and the facing surface 13a of the driving magnet 13 is a single surface. The pole is magnetized. Therefore, in this embodiment, it is possible to generate a driving force in a direction substantially orthogonal to the optical axis direction between the short side portion 12a and the driving magnet 13, and the movable body 2 in a direction substantially orthogonal to the optical axis direction. It is possible to drive the lens held by the lens. Therefore, in this embodiment, by driving the lens in a direction substantially orthogonal to the optical axis direction, it is possible to correct shake when shooting is performed with a camera in which the lens driving device 1 is mounted.

  In this embodiment, a common driving magnet 13 is used to generate a driving force of the movable body 2 in the optical axis direction and a driving force of the movable body 2 in a direction substantially orthogonal to the optical axis direction. . Therefore, a driving magnet for generating a driving force of the movable body 2 in the optical axis direction and a driving magnet for generating a driving force of the movable body 2 in a direction substantially orthogonal to the optical axis direction are individually provided. The structure of the drive mechanism 4 can be simplified compared with the case where it is provided. Therefore, the configuration of the lens driving device 1 can be simplified and the lens driving device 1 can be downsized.

  In this embodiment, each of the two short side portions 12a constituting one second driving coil 12 is opposed to each of the opposing surfaces 13a of the driving magnets 13 adjacent in the circumferential direction. Therefore, it is possible to generate a driving force in a direction substantially orthogonal to the optical axis direction on the two short side portions 12 a constituting one second driving coil 12. Therefore, it becomes possible to increase the driving force of the lens in a direction substantially orthogonal to the optical axis direction.

  In the present embodiment, the two second drive coils 12A and 12C arranged on the diagonal line of the sleeve 7 are formed by sequentially winding one conductive wire, and the remaining two second drive coils 12B. , 12D is formed by sequentially winding another one conducting wire. Therefore, the configuration of the current supply circuit for supplying current to the four second driving coils 12 can be simplified. Further, current supply control for supplying current to the four second driving coils 12 is facilitated.

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

  In the above-described form, the second drive coil 12A and the second drive coil 12C are formed by sequentially winding one conductive wire, and the second drive coil 12B and the second drive coil 12D are: Another one conducting wire is formed by being wound sequentially. In addition, for example, each of the four second driving coils 12 is formed by winding four conductive wires, and the second driving coil 12A and the second driving coil 12C are connected in series. The second drive coil 12C and the second drive coil 12D may be connected in series. Even in this case, the configuration of the current supply circuit for supplying current to the four second driving coils 12 can be simplified, and the four second driving coils 12 can be simplified. Current supply control for supplying current is facilitated.

  In the embodiment described above, the facing surface 13a of the driving magnet 13 is magnetized to a single pole. In addition, for example, the facing surface 13a of the driving magnet 13 may be magnetized so that two magnetic poles different in the optical axis direction are adjacent to each other, as shown in FIGS. In this case, for example, as shown in FIG. 6, two first drive coils 11 are wound around the outer peripheral surface of the movable body 2 at a predetermined interval in the optical axis direction, and two first Each of the driving coils 11 is disposed so as to face each of the two magnetic poles of the facing surface 13a. If each of the two first driving coils 11 is disposed so as to face each of the two magnetic poles of the facing surface 13a, the permeance coefficient of the lens driving device 1 can be increased. In this case, the winding directions of the two first driving coils 11 are different from each other.

  Further, in this case, as shown in FIG. 7, the two long side portions 12b constituting one second driving coil 12 are arranged so as to face the two magnetic poles of the facing surface 13a. Is done. Therefore, in this case, when a current is supplied to the second driving coil 12, a driving force in the optical axis direction is generated at each of the four corners of the movable body 2. Accordingly, it is possible to correct the inclination of the optical axis L of the lens held by the movable body 2 by changing the magnitude of the driving force generated at each of the four corners of the movable body 2. Therefore, in this case, it is possible to suppress the inclination of the optical axis L of the lens by appropriately correcting the inclination of the optical axis L of the lens.

  In particular, in this case, each of the two long side portions 12b constituting one second driving coil 12 is opposed to each of the two magnetic poles of the opposing surface 13a. In each of these, it is possible to generate a driving force in the optical axis direction by using the four long side portions 12b. Therefore, the driving force in the optical axis direction generated at the four corners of the movable body 2 can be increased, and the inclination of the optical axis L of the lens can be corrected more appropriately.

  Further, in this case, since it is possible to correct the inclination of the optical axis L of the lens, it is possible to correct this shake when a shake occurs in the camera in which the lens driving device 1 is mounted. Become. In this case, since the short side portion 12a is disposed so as to straddle two different magnetic poles of the opposing surface 13a, the driving force in the direction substantially perpendicular to the optical axis direction generated in the short side portion 12a is canceled out. Is done.

  In this case, each of the four second driving coils 12 is formed by winding each of the four conductive wires, and is supplied to each of the second driving coils 12A and 12C. Preferably, the difference in current magnitude is controlled, and the difference in magnitude of the current supplied to each of the second drive coils 12B and 12D is controlled. With this configuration, the inclination of the optical axis L of the lens having the second direction W as the axial direction is corrected by the second driving coils 12A and 12C, and the first direction V is corrected by the second driving coils 12B and 12D. It is possible to correct the inclination of the optical axis L of the lens whose axis direction is. Therefore, the four second driving coils 12 can correct the inclination of the optical axis L in all directions.

  In this case, each of the four second driving coils 12 is formed by winding each of the four conductive wires, and the second driving coil 12A and the second driving coil 12B. May be connected in series, and the second drive coil 12C and the second drive coil 12D may be connected in series. Alternatively, the second driving coil 12A and the second driving coil 12B are formed by sequentially winding one conductive wire, and the second driving coil 12C and the second driving coil 12D are the other one. It may be formed by winding a conducting wire sequentially. With this configuration, by controlling the difference between the magnitude of the current supplied to the second drive coils 12A and 12B and the magnitude of the current supplied to the second drive coils 12C and 12D, the Y direction can be It becomes possible to correct the inclination of the optical axis L of the lens as the direction.

  In this case, each of the four second driving coils 12 is formed by winding each of the four conductive wires, and the second driving coil 12A and the second driving coil 12D May be connected in series, and the second drive coil 12B and the second drive coil 12C may be connected in series. Alternatively, the second driving coil 12A and the second driving coil 12D are formed by sequentially winding one conductive wire, and the second driving coil 12B and the second driving coil 12C are the other one. It may be formed by winding a conducting wire sequentially. With this configuration, by controlling the difference between the magnitude of the current supplied to the second drive coils 12A and 12D and the magnitude of the current supplied to the second drive coils 12B and 12C, the X direction can be It becomes possible to correct the inclination of the optical axis L of the lens as the direction.

  In addition, when the facing surface 13a of the driving magnet 13 is magnetized so that two magnetic poles that are different in the optical axis direction are adjacent to each other, only one of the two magnetic poles of the facing surface 13a is opposed. Alternatively, one first driving coil 11 may be wound around the outer peripheral surface of the movable body 2. In this case, the four second driving coils 12 are movable body 2 so that only one or the other of the two magnetic poles of the facing surface 13a faces the second driving coil 12. It may be arranged at the four corners. Even in this case, it is possible to correct the shake by driving the lens in a direction substantially orthogonal to the optical axis direction.

  Moreover, when the opposing surface 13a is magnetized to a single pole as in the embodiment described above, only one of the two long side portions 12b constituting one second driving coil 12 is the opposing surface. The four second driving coils 12 may be arranged at the four corners of the movable body 2 so as to face 13a. Even in this case, since the driving force in the optical axis direction can be generated at each of the four corners of the movable body 2, the magnitude of the driving force generated at each of the four corners of the movable body 2 can be changed. Thus, the inclination of the optical axis L of the lens held by the movable body 2 can be corrected.

  In the embodiment described above, the four short side portions 12a constituting one second driving coil 12 are respectively opposed to the opposing surfaces 13a of the driving magnets 13 adjacent in the circumferential direction. A number of drive magnets 13 are arranged. In addition to this, for example, the second driving coil is configured such that only one of the two short side portions 12 a constituting one second driving coil 12 faces the facing surface 13 a of the driving magnet 13. 12 and the driving magnet 13 may be formed and arranged.

  In the embodiment described above, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square. In addition, for example, the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is substantially rectangular.

  In the embodiment described above, the lens driving device 1 is mounted on a camera used in a mobile phone or the like. In addition to this, for example, the lens driving device 1 may be mounted on a camera used in a drive recorder that records the driving situation of an automobile. In this case, when camera shake (vibration) due to automobile vibration or the like during traveling is detected, current is supplied to the second drive coil 12 to correct the shake. The lens driving device 1 may be mounted on other devices such as a monitoring camera.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 11 1st drive coil 12 (12A-12D) 2nd drive coil 12a Short side part (1st side part)
12b Long side (second side)
13 (13A to 13D) Driving magnet 13a Opposing surface L Optical axis

Claims (8)

A lens driving device having a substantially square shape when viewed from the optical axis direction of the lens,
A movable body that holds and moves the lens, a fixed body that movably holds the movable body, and a drive mechanism for driving the movable body,
The movable body is formed so that the outer shape when viewed from the optical axis direction is a substantially rectangular shape,
The driving mechanism includes a first driving coil wound around the outer peripheral surface of the movable body, and is formed by being wound in an air-core shape and bent at approximately 90 ° at the four corners of the movable body. Four drive coils arranged in parallel with the four second driving coils respectively disposed along the outer peripheral surface of the movable body, and four substantially plate-shaped drives arranged substantially parallel to the four side surfaces of the lens driving device. And a magnet for
The lens driving device according to claim 1, wherein the driving magnet is arranged to face the first driving coil and the second driving coil. The second driving coil is wound in a substantially rectangular shape including two first sides that are substantially parallel to the optical axis direction and two second sides that are substantially orthogonal to the optical axis direction. And formed by being bent at approximately 90 ° at a predetermined position of the second side part,
2. The lens according to claim 1, wherein the first side portion is opposed to one magnetic pole on a surface of the driving magnet facing the first driving coil and the second driving coil. Drive device. The opposed surfaces of the four drive magnets are magnetized to a single pole and magnetized to the same magnetic pole,
Each of the two first sides constituting the one second driving coil is opposed to each of the opposing surfaces of the driving magnets adjacent in the circumferential direction of the lens driving device. The lens driving device according to claim 2. Of the four second driving coils, the two second driving coils arranged on the diagonal line of the movable body when viewed from the optical axis direction are sequentially wound by one conductor. The remaining two second driving coils are formed by sequentially winding another one conducting wire, or
Each of the four second driving coils is formed by winding each of the four conductive wires, and when viewed from the optical axis direction of the four second driving coils. The two second driving coils arranged on a diagonal line of the movable body are connected in series, and the remaining two second driving coils are connected in series. Item 4. The lens driving device according to Item 3. The second driving coil is wound in a substantially rectangular shape including two first sides that are substantially parallel to the optical axis direction and two second sides that are substantially orthogonal to the optical axis direction. And formed by being bent at approximately 90 ° at a predetermined position of the second side part,
2. The lens according to claim 1, wherein the second side portion faces one magnetic pole on a surface of the driving magnet facing the first driving coil and the second driving coil. Drive device. Two first drive coils arranged at a predetermined interval in the optical axis direction;
The opposing surface of the driving magnet is magnetized so that two different magnetic poles are adjacent to each other in the optical axis direction,
Each of the two first driving coils is disposed to face each of the two magnetic poles of the facing surface of the driving magnet,
2. Each of the two second sides constituting the one second driving coil is opposed to each of two magnetic poles of the facing surface of the driving magnet. 5. The lens driving device according to 5.   7. The lens driving device according to claim 5, wherein each of the four second driving coils is formed by winding each of the four conductive wires.   Of the four second driving coils, the magnitude of the current supplied to each of the two second driving coils arranged on a diagonal line of the movable body when viewed from the optical axis direction. 8. The lens driving device according to claim 7, wherein the difference in height is controlled, and the difference in magnitude of the current supplied to each of the remaining two second driving coils is controlled.

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