JP5404275B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device used in a relatively small camera mounted on 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.

  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.

In order to solve the above-described problems, a lens driving device according to the present invention includes a movable body that holds a lens and is movable in a direction substantially orthogonal to the optical axis direction of the lens and the optical axis direction, A fixed body that holds the movable body so that the movable body can move in a direction substantially orthogonal to the optical axis direction, a first drive mechanism for driving the movable body in the optical axis direction, and substantially orthogonal to the optical axis direction A second drive mechanism for driving the movable body in a predetermined first direction, and a third drive mechanism for driving the movable body in a second direction substantially orthogonal to the optical axis direction and the first direction. And a spring member having a movable body fixing portion fixed to the movable body and a fixed body fixing portion fixed to the fixed body. The spring members are provided on one end side and the other end side of the movable body in the optical axis direction. arranged respectively at one end and the movable body in the optical axis direction Each end side, there is the spring force acting point of 4箇plants are movable body fixing portion spring force of the fixed spring member acts, when viewed in the optical axis direction, the driving force by the first driving mechanism The first driving force center of gravity, which is the center of gravity, is arranged closer to the center of the movable body when viewed from the optical axis direction than the eight spring force action points , and when viewed from the first direction, the second driving mechanism The second driving force center of gravity, which is the center of gravity of the driving force by, is arranged closer to the center of the movable body when viewed from the first direction than the eight spring force action points , and when viewed from the second direction, The third driving force center of gravity, which is the center of gravity of the driving force by the third driving mechanism , is disposed closer to the center side of the movable body when viewed from the second direction than the eight spring force action points. , First driving magnets arranged opposite to each other, or first driving magnets arranged opposite to each other and the first magnetism Between the first drive magnets arranged opposite to each other or between the first drive magnets arranged opposite to each other and the first magnetic piece. A uniform first magnetic field region is formed, and the first driving coil is disposed between the first driving magnets arranged to face each other or between the first driving magnet and the first magnetic piece arranged to face each other. Between the first drive magnets disposed between and opposed to each other, or between the first drive magnets disposed opposite to each other and the first magnetic piece, approximately in the direction of the optical axis and the optical axis direction. A first effective coil portion through which current flows in an orthogonal direction, and the second drive mechanism includes: a second drive magnet disposed opposite to each other; a second drive magnet and a second magnetic piece disposed opposite each other; A second driving magnet provided with two driving coils and arranged opposite to each other Alternatively, a second magnetic field region having a uniform magnetic flux density is formed between the second driving magnet and the second magnetic piece that are arranged to face each other, and the second driving coils are arranged to face each other. Between the second driving magnets, or between the second driving magnet and the second magnetic piece that are arranged to face each other, between the second driving magnets that are arranged to face each other, or to face each other A second effective coil portion that is substantially orthogonal to the direction of the magnetic flux generated between the second driving magnet and the second magnetic piece and flows in a direction substantially parallel to the optical axis direction. A third drive magnet disposed opposite to each other, or a third drive magnet and third magnetic piece disposed opposite to each other, and a third drive coil, and between the third drive magnets disposed opposite to each other. Or a third driving magnet and a third magnet arranged opposite to each other A third magnetic field region having a uniform magnetic flux density is formed between the third driving coil and the third driving coil between the third driving magnets arranged opposite to each other or the third driving arranged opposite to each other. Between the third magnet and the third magnetic piece, and between the third driving magnets arranged opposite to each other or between the third driving magnet arranged opposite to each other and the third magnetic pieces And a third effective coil portion in which current flows in a direction substantially parallel to the optical axis direction and the volume of the first effective coil portion arranged in the first magnetic field region is the optical axis direction, the first direction. And the volume of the second effective coil portion disposed in the second magnetic field region is substantially constant within the movable range of the movable body in the second direction, and / or the volume of the second effective coil portion is the optical axis direction, the first direction, and the second direction. Is substantially constant within the movable range of the movable body, and / or The volume of the third effective coil portion disposed in the third magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction, and is disposed opposite to each other. A first driving magnet or a first driving magnet and a first magnetic piece arranged opposite to each other; a second driving magnet or a second driving magnet and a second magnetic piece arranged opposite to each other; The third driving magnet arranged opposite to each other or the third driving magnet and the third magnetic piece arranged opposed to each other are attached to the fixed body, and the first driving coil, the second driving coil, The three driving coils are attached to the movable body, the first driving magnets arranged opposite to each other are the same as the second driving magnets arranged opposite to each other, and the third driving coils arranged opposite to each other. By magnet and common things The first driving magnet and the first magnetic piece that are configured or arranged to face each other are arranged to face each other with the second driving magnet and the second magnetic piece that are arranged to face each other. The third driving magnet and the third magnetic piece are common .

  In the lens driving device of the present invention, the movable body that holds the lens is movable in the optical axis direction of the lens and in a direction orthogonal to the optical axis direction, and the lens driving device of the present invention is in the optical axis direction. A first drive mechanism for driving the movable body, a second drive mechanism for driving the movable body in a first direction substantially orthogonal to the optical axis direction, and a first drive mechanism substantially orthogonal to the optical axis direction and the first direction. And a third drive mechanism for driving the movable body in two directions. Therefore, in the present invention, the lens can be driven in the optical axis direction using the first drive mechanism. That is, in the present invention, an autofocus operation can be performed using the first drive mechanism. In addition, the lens can be driven in a direction substantially orthogonal to the optical axis direction by using the second drive mechanism and the third drive mechanism. Therefore, in the present invention, by driving the lens in a direction substantially orthogonal to the optical axis direction, it is possible to correct the deviation of the photographed image caused by the shake in the direction substantially orthogonal to the optical axis direction. It is possible to correct shake when shooting is performed with a camera on which the apparatus is mounted. In the present invention, it is also possible to simultaneously drive the lens in the optical axis direction and the lens in the direction substantially orthogonal to the optical axis direction.

In the present invention, the spring member is disposed on each of the one end side and the other end side of the movable body in the optical axis direction, and is fixed to each of the one end side and the other end side of the movable body in the optical axis direction. There are four spring force action points where the part is fixed and the spring force of the spring member acts, and when viewed from the optical axis direction, the first drive force center of gravity that is the center of gravity of the drive force by the first drive mechanism is 8 It is arranged closer to the center side of the movable body when viewed from the optical axis direction than the spring force action point at the location. Therefore, even when the movable body is moving in a direction substantially orthogonal to the optical axis direction, the movable body is inclined with respect to the optical axis direction when the movable body is driven in the optical axis direction by the first drive mechanism. It becomes difficult. Further, the second driving force center of gravity, which is the center of gravity of the driving force by the second driving mechanism when viewed from the first direction, is greater than the eight spring force action points of the movable body when viewed from the first direction. It is arranged on the center side. Therefore, even when the movable body is moving in the optical axis direction or the second direction, when the movable body is driven in the first direction by the second drive mechanism, the movable body is not easily inclined with respect to the first direction. Become. Further, when viewed from the second direction, the third driving force center of gravity, which is the center of gravity of the driving force by the third driving mechanism, is greater than the eight spring force action points of the movable body when viewed from the second direction. It is arranged on the center side. Therefore, even when the movable body is moving in the optical axis direction or the first direction, when the movable body is driven in the second direction by the third drive mechanism, the movable body is not easily inclined with respect to the second direction. Become.

  Therefore, in the present invention, even if the movable body holding the lens is movable in the optical axis direction of the lens and in the direction orthogonal to the optical axis direction, the movable body with respect to the optical axis direction, the first direction, and the second direction. It is possible to suppress the tilt. As a result, according to the present invention, it is possible to improve the quality of an image taken by a camera equipped with a lens driving device.

Here, in the present invention, “the center of gravity of the driving force by the first driving mechanism” means the point of action when there is only one operating point of the driving force to the movable body by the first driving mechanism. Say. Further, in the present invention, “the center of gravity of the driving force by the first driving mechanism” refers to each operating point when there are two or more operating points of the driving force to the movable body by the first driving mechanism. The point where the product of the driving force and the distance to each action point when viewed from the optical axis direction is equal. For example, the action point of the driving force applied to the movable body by the first drive mechanism is from the action point a. When there are four places up to the action point d, the driving force acting on the action point a is Fa, the distance from the action point a to the center of gravity of the driving force when viewed from the optical axis direction is La, and the action point b. The acting driving force is Fb, the distance from the acting point b to the center of gravity of the driving force when viewed from the optical axis direction is Lb, the driving force acting on the acting point c is Fc, and the acting point when viewed from the optical axis direction The distance from c to the center of gravity of the driving force is Lc, the driving force acting on the action point d is Fd, and from the optical axis direction When the distance to the center of gravity of the driving force from the point d and Ld when the following equations are satisfied.
Fa × La = Fb × Lb = Fc × Lc = Fd × Ld
Similarly, in the present invention, “the center of gravity of the driving force by the second driving mechanism” refers to the point of action when there is only one operating point of the driving force to the movable body by the second driving mechanism. If there are two or more points of action of the driving force applied to the movable body by the second drive mechanism, the driving force acting on each point of action and the distance to each point of action when viewed from the first direction, The point where the products of are equal. In the present invention, “the center of gravity of the driving force by the third driving mechanism” refers to the point of action when there is only one operating point of the driving force to the movable body by the third driving mechanism. When there are two or more operating points of the driving force applied to the movable body by the third driving mechanism, the driving force applied to each operating point and the distance to each operating point when viewed from the second direction. The point where the products are equal.

In the present invention, when the volume of the first effective coil portion arranged in the first magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction. Even when the movable body is moving in a direction substantially orthogonal to the optical axis direction, the balance of the driving force around the optical axis of the first drive mechanism is not easily lost, so the first drive mechanism It is possible to effectively suppress the inclination of the movable body with respect to the optical axis direction when driving in the optical axis direction. Further, in the present invention, when the volume of the second effective coil portion arranged in the second magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction. Even when the movable body is moving in the optical axis direction or the second direction, the balance of the driving force of the second driving mechanism around the predetermined axis that is substantially parallel to the first direction and passes through the optical axis. Therefore, it is possible to effectively suppress the inclination of the movable body with respect to the first direction when the movable body is driven in the first direction by the second drive mechanism. Further, in the present invention, when the volume of the third effective coil portion arranged in the third magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction. Even when the movable body moves in the optical axis direction or the first direction, the balance of the driving force of the third driving mechanism around the predetermined axis that is substantially parallel to the second direction and passes through the optical axis Therefore, it is possible to effectively suppress the inclination of the movable body with respect to the second direction when the movable body is driven in the second direction by the third drive mechanism. Further, even when the movable body is moving in the optical axis direction or in a direction substantially orthogonal to the optical axis direction, the driving force in the optical axis direction of the first drive mechanism or the first direction of the second drive mechanism. And the driving force of the third driving mechanism in the second direction are less likely to fluctuate. Therefore, the movable body can be moved in a stable state in the optical axis direction and the direction orthogonal to the optical axis direction. In the present invention, the first driving magnets arranged opposite to each other are common to the second driving magnets arranged opposite to each other, and the same as the third driving magnet arranged opposite to each other. The first driving magnet and the first magnetic piece that are configured or arranged to face each other are arranged to face each other with the same thing as the second driving magnet and the second magnetic piece arranged to face each other. The third driving magnet and the third magnetic piece are common. Therefore, it is not necessary to separately provide the first drive magnet in addition to the second drive magnet and the third drive magnet. In addition to the second magnetic piece and the third magnetic piece, it is not necessary to separately provide the first magnetic piece. Therefore, the configuration of the lens driving device can be simplified.

  In the present invention, the first restoring force centroid, which is the centroid of the restoring force of the movable body in the optical axis direction by the spring member when the movable body moves in the optical axis direction, is the first drive when viewed from the optical axis direction. The second restoring force centroid which is substantially coincident with the force centroid and / or becomes the centroid of the restoring force of the movable body in the first direction by the spring member when the movable body moves in the first direction is the first direction The third driving force substantially coincides with the center of gravity of the second driving force and / or becomes the center of gravity of the restoring force of the movable body in the second direction by the spring member when the movable body moves in the second direction. It is preferable that the restoring force center of gravity substantially coincides with the third driving force center of gravity when viewed from the second direction. If comprised in this way, the inclination of a movable body with respect to the optical axis direction at the time of driving a movable body to an optical axis direction by a 1st drive mechanism will be eliminated, and / or a movable body will be made to a 1st direction by a 2nd drive mechanism. It is possible to eliminate the inclination of the movable body with respect to the first direction during driving and / or to eliminate the inclination of the movable body with respect to the second direction when driving the movable body in the second direction by the third drive mechanism. Become.

Here, in the present invention, the “centroid of the restoring force of the movable body in the optical axis direction” means the acting force of the spring member acting on each spring force acting point and the optical axis direction when viewed from the optical axis direction. It means a point where the product of the distance to each spring force action point becomes equal. For example, when there are four spring force action points from spring force action point e to spring force action point h, the spring force The acting force of the spring member in the optical axis direction acting on the action point e is Fe, the distance from the spring force action point e when viewed from the optical axis direction to the center of gravity of the restoring force is Le, and the spring force action point f is applied. The acting force of the spring member in the optical axis direction is Ff, the distance from the spring force acting point f when viewed from the optical axis direction to the center of gravity of the restoring force is Lf, and the spring member acting in the optical axis direction acting on the spring force acting point g Fg, the distance from the spring force acting point g to the center of gravity of the restoring force when viewed from the optical axis direction, Lg, If the acting force of the spring member in the optical axis direction acting on the net force acting point h is Fh, and the distance from the spring force acting point h to the center of gravity of the restoring force when viewed from the optical axis direction is Lh, the following equation is established. To do.
Fe × Le = Ff × Lf = Fg × Lg = Fh × Lh

  Similarly, in the present invention, “the center of gravity of the restoring force of the movable body in the first direction” means the acting force of the spring member in the first direction acting on each spring force acting point and when viewed from the first direction. The point where the product with the distance to each spring force action point becomes equal. In the present invention, the “centroid of the restoring force of the movable body in the second direction” means the acting force of the spring member acting in the second direction acting on each spring force acting point and each when viewed from the second direction. The point where the product of the distance to the spring force action point is equal.

  In the present invention, when viewed from the optical axis direction, there are two or more pairs of spring force action points that are arranged approximately point-symmetrically with respect to a predetermined zeroth reference point, and substantially with respect to the zeroth reference point. The acting force of the spring member in the optical axis direction at a pair of spring force acting points arranged symmetrically with respect to the point is substantially equal and / or substantially pointed with respect to a predetermined first reference point when viewed from the first direction. There are two or more pairs of spring force acting points arranged symmetrically, and the acting force of the spring member in the first direction at the pair of spring force acting points arranged substantially point symmetrically with respect to the first reference point is There are two or more pairs of spring force action points arranged substantially symmetrically with respect to a predetermined second reference point when viewed from the second direction, and / or the second reference point. Action of the spring member in the second direction at a pair of spring force action points arranged substantially symmetrical with respect to the point There generally is preferably equal. In this case, the 0th reference point coincides with the optical axis when viewed from the optical axis direction, and the first reference point is disposed on the optical axis when viewed from the first direction, The reference point is preferably disposed on the optical axis when viewed from the second direction.

  If comprised in this way, it will become easy to obtain | require a 1st restoring force gravity center, a 2nd restoring force gravity center, and / or a 3rd restoring force gravity center. Therefore, the first restoring force centroid and the first driving force centroid substantially coincide with each other when viewed from the optical axis direction, and / or the second restoring force centroid and second when viewed from the first direction. It becomes easy to substantially match the driving force center of gravity and / or to substantially match the third restoring force center of gravity and the third driving force center of gravity when viewed from the second direction.

  In the present invention, the movable body has the first driving force action point at which the driving force by the first driving mechanism acts at an even number of two or more places. When viewed from the optical axis direction, the movable body has a predetermined fifth reference point. There is at least a pair of first driving force action points arranged approximately point-symmetrically with respect to each other, and the driving force at the pair of first driving force action points arranged substantially point-symmetrically with respect to the fifth reference point is approximately And / or the movable body has second driving force action points at which the driving force by the second driving mechanism is applied at two or more even positions, and a predetermined third when viewed from the first direction. There is at least a pair of second driving force action points arranged substantially symmetrically with respect to the reference point, and driving at a pair of second driving force action points arranged substantially symmetrical with respect to the third reference point The force is substantially equal and / or the movable body is driven by a third drive mechanism. There are at least a pair of third driving points at which the third driving force acting point on which the power is applied is located at two or more even positions, and arranged substantially point-symmetrically with respect to the predetermined fourth reference point when viewed from the second direction. It is preferable that there is a force action point and the driving forces at the pair of third driving force action points arranged substantially point-symmetrically with respect to the fourth reference point are substantially equal. In this case, the fifth reference point coincides with the optical axis when viewed from the optical axis direction, and the third reference point is disposed on the optical axis when viewed from the first direction. The reference point is preferably disposed on the optical axis when viewed from the second direction.

  If comprised in this way, it will become easy to obtain | require a 1st driving force gravity center, a 2nd driving force gravity center, and / or a 3rd driving force gravity center. Therefore, the first restoring force centroid and the first driving force centroid substantially coincide with each other when viewed from the optical axis direction, and / or the second restoring force centroid and second when viewed from the first direction. It becomes easy to substantially match the driving force center of gravity and / or to substantially match the third restoring force center of gravity and the third driving force center of gravity when viewed from the second direction.

In the present invention, when viewed from the optical axis direction, the center of gravity of the movable body is disposed closer to the center side of the movable body when viewed from the optical axis direction than the eight spring force action points, and from the first direction. When viewed, the center of gravity of the movable body is located closer to the center of the movable body when viewed from the first direction than the eight spring force action points, and when viewed from the second direction, It is preferable that the center of gravity is arranged closer to the center of the movable body when viewed from the second direction than the eight spring force action points . If comprised in this way, when moving a movable body, it will become difficult to incline a movable body with respect to an optical axis direction, a 1st direction, and a 2nd direction. In addition, the movable body is less likely to tilt in the optical axis direction, the first direction, and the second direction due to the difference in posture of the lens driving device.

In the present invention, for example, the movable body is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape having an outer circumferential surface substantially parallel to the first direction or the second direction, and the first driving coil is along the outer circumferential surface of the movable body. The lens driving device is a first driving magnet that is disposed so as to face a part of the first driving coil in the first direction as the first driving magnet, and the first driving magnet in the second direction. Or a first driving magnet disposed oppositely so as to sandwich a part of the driving coil, or the lens driving device includes a part of the first driving coil as the first driving magnet and the first magnetic piece. A first driving magnet and a first magnetic piece arranged to face each other in the first direction so as to sandwich the first driving magnet, and a first driving magnet and a first driving magnet arranged to face each other in the second direction so as to sandwich a part of the first driving coil A first magnetic piece, and in the entire movable range of the movable body in the optical axis direction, The entire first drive coil in the axial direction is disposed in the first magnetic field region, and the first drive coil is disposed in the entire movable range of the movable body in the first direction and in the entire first magnetic field region in the first direction. In addition, the first drive coil is disposed over the entire movable range of the movable body in the second direction and over the entire first magnetic field region in the second direction.

In the present invention, for example, the second driving coil is wound in a substantially rectangular flat plate shape having four second straight side portions, and one second straight line out of the four second straight side portions. The side portion is a second effective coil portion, and the entire second effective coil portion is disposed in the second magnetic field region over the entire movable range of the movable body in the optical axis direction, the first direction, and the second direction. . Further, for example, the third drive coil is wound in a substantially rectangular flat plate shape having four third straight side portions, and one third straight side portion of the four third straight side portions. Is the third effective coil portion, and the entire third effective coil portion is disposed in the third magnetic field region over the entire movable range of the movable body in the optical axis direction, the first direction, and the second direction.

  In the present invention, the second driving mechanism is wound in a substantially rectangular flat plate shape and includes at least two second driving coils each including four second linear sides, and in the thickness direction of the second driving coil. A second drive magnet for generating magnetic flux, and the two second drive coils are adjacent so that the second adjacent sides which are one of the four second straight sides are adjacent to each other. The second driving magnet is provided with a second facing surface facing two second adjacent side portions, the second facing surface is magnetized to a single pole, and the second driving coils are adjacent to each other. And the third driving mechanism is wound in a substantially rectangular flat plate shape and is wound into four second straight lines. At least two third driving coils formed of side portions, and a third driving magnet for generating magnetic flux in the thickness direction of the third driving coil The two third drive coils are arranged adjacent to each other so that the third adjacent sides that are one of the four third straight sides are adjacent to each other, and the third drive magnet is The third counter surface is provided with a third counter surface facing two third adjacent side portions, the third counter surface is magnetized to a single pole, and the third driving coil is disposed on the two third adjacent side portions adjacent to each other. It is preferably wound so that currents in the same direction flow. If comprised in this way, the driving force of a 2nd drive mechanism will be raised using two 2nd adjacent edge parts, and / or a 3rd drive mechanism will be utilized using two 3rd adjacent edge parts. It becomes possible to increase the driving force.

In the present invention, for example, the spring member can be deformed in the optical axis direction, the first direction, and the second direction, and each of the plurality of spring force action points includes the optical axis direction, the first direction, and the second direction. Directional spring force acts.

In the present invention, the spring member is a leaf spring including an arm portion that connects the movable body fixing portion and the fixed body fixing portion, and the arm portion is an elongated first arm whose longitudinal direction is substantially parallel to the first direction. and part preferably comprises an elongate second arm portion and a direction substantially parallel to the second direction to the longitudinal direction. If comprised in this way, it will become possible to move a movable body appropriately to the direction substantially orthogonal to an optical axis direction and an optical axis direction.

  In the present invention, for example, the movable body is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape, and four movable body fixing portions are fixed to the four corners of the movable body on one end side of the movable body in the optical axis direction. The four springs are arranged so that the spring member is arranged in a rotational symmetry of 90 ° about the optical axis and the movable body fixing portions are fixed to the four corners of the movable body on the other end side of the movable body in the optical axis direction. The members are arranged in a rotational symmetry of 90 ° about the optical axis, four spring members arranged on one end side of the movable body in the optical axis direction, and arranged on the other end side of the movable body in the optical axis direction The four spring members are substantially plane-symmetric with respect to a predetermined plane orthogonal to the optical axis.

  In the present invention, the spring member is disposed on both ends of the movable body in the optical axis direction, and is a spring on one end side of the movable body in the optical axis direction and the first plane that is orthogonal to the optical axis direction and includes the second driving force gravity center. The distance in the optical axis direction from the force acting point and the acting force of the spring member in the first direction at the spring force acting point on one end side of the movable body in the optical axis direction when the movable body moves in the first direction. The product is the distance in the optical axis direction between the first plane and the spring force acting point on the other end side of the movable body in the optical axis direction, and the other of the movable body in the optical axis direction when the movable body moves in the first direction. The second plane and the optical axis that are substantially equal to the product of the acting force of the spring member in the first direction at the spring force acting point on the end side and / or that are orthogonal to the optical axis direction and include the third driving force gravity center The distance in the optical axis direction from the point of application of the spring force on one end of the movable body in the direction The product of the acting force of the spring member in the second direction at the spring force acting point on the one end side of the movable body in the optical axis direction when the movable body moves in the second direction is movable in the second plane and the optical axis direction. The distance in the optical axis direction from the spring force action point on the other end side of the body, and the second direction at the spring force action point on the other end side of the movable body in the optical axis direction when the movable body moves in the second direction It is preferable that the product is substantially equal to the product of the acting force of the spring member. If comprised in this way, the inclination of a movable body with respect to the 1st direction at the time of driving a movable body to a 1st direction by a 2nd drive mechanism will be suppressed effectively, and / or a 2nd direction will be carried out by a 3rd drive mechanism. It is possible to effectively suppress the inclination of the movable body with respect to the second direction when the movable body is driven.

  In the present invention, the spring constant of the spring member in the optical axis direction is preferably smaller than the spring constant of the spring member in a direction substantially orthogonal to the optical axis direction. If comprised in this way, even if a movable body can move to the direction substantially orthogonal to an optical axis direction, it becomes possible to stabilize a movable body in the direction substantially orthogonal to an optical axis direction. Therefore, it is possible to suppress a decrease in the quality of an image taken by a camera equipped with a lens driving device.

  In the present invention, the lens driving device includes, as spring members, two spring members made of a conductive material to which both ends of the conducting wire forming the first driving coil constituting the first driving mechanism are fixed, Two spring members made of a conductive material to which both ends of a conducting wire forming the second drive coil constituting the second drive mechanism are fixed, and a third drive coil constituting the third drive mechanism It is preferable to include two spring members made of a conductive material to which both ends of the conductive wire to be formed are fixed. If comprised in this way, it is necessary to provide separately the member for fixing the edge part of the conducting wire which forms the 1st drive coil, the conducting wire which forms the 2nd driving coil, and the conducting wire which forms the 3rd driving coil. Disappear. Therefore, the configuration of the lens driving device can be simplified.

  In the present invention, the lens driving device includes, as a spring member, a spring member made of a conductive material to which one end side of the first conducting wire forming the first driving coil constituting the first driving mechanism is fixed, and the second driving. A spring member made of a conductive material to which one end side of the second conducting wire forming the second driving coil constituting the mechanism is fixed, and a third conducting wire forming the third driving coil constituting the third driving mechanism At least two of a spring member made of a conductive material to which one end side of the first conductive wire is fixed, the other end side of the first conductive wire, the other end side of the second conductive wire, and the other end side of the third conductive wire are fixed. And a spring member made of a conductive material. If comprised in this way, the edge part of the 1st conducting wire which forms the 1st drive coil, the 2nd conducting wire which forms the 2nd driving coil, and the 3rd conducting wire which forms the 3rd driving coil is fixed. Therefore, it is not necessary to provide a separate member for the lens driving device, and the configuration of the lens driving device can be simplified. Moreover, if comprised in this way, at least 2 of the other end side of the 1st conducting wire, the other end side of the 2nd conducting wire, and the other end side of the 3rd conducting wire is fixed to a common spring member. Therefore, for example, the first conductor that forms the first drive coil only on one side of the movable body in the optical axis direction, the second conductor that forms the second drive coil, and the third conductor that forms the third drive coil. It is possible to fix the ends of the three conductors. Therefore, the routing process of the first drive coil, the second drive coil, and the third drive coil can be easily performed.

  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 present invention, even if the movable body that holds the lens is movable in the optical axis direction of the lens and in the direction orthogonal to the optical axis direction, the movable body with respect to the optical axis direction and the direction orthogonal to the optical axis direction is used. By suppressing the tilt, it is possible to improve the quality of an image captured by a camera equipped with a lens driving device.

It is a perspective view of the lens drive device concerning Embodiment 1 of the present invention. It is a top view for demonstrating schematic structure of the lens drive device shown in FIG. It is a longitudinal cross-sectional view for demonstrating schematic structure of the lens drive device shown in FIG. It is a figure for demonstrating the structure of the drive mechanism shown in FIG. 2 from a side surface. FIG. 5 is a diagram for explaining a relationship between a driving magnet and a driving coil in an E part of FIG. 4. It is a figure for demonstrating the relationship between the drive magnet in the F section of FIG. 4, and a drive coil. It is a top view for demonstrating the position of the action point of the driving force of the drive mechanism in the lens drive device shown in FIG. 1, and the position of the action point of the spring force of a leaf | plate spring. It is a side view for demonstrating the position of the action point of the drive force of the drive mechanism in the lens drive device shown in FIG. 1, and the position of the action point of the spring force of a leaf | plate spring from a X direction. It is a side view for demonstrating the position of the action point of the drive force of the drive mechanism in the lens drive device shown in FIG. 1, and the position of the action point of the spring force of a leaf | plate spring from a Y direction. It is a schematic perspective view for demonstrating the position of the gravity center of the movable body shown in FIG. 1, and the position of the action point of the spring force of a leaf | plate spring. It is a top view for demonstrating schematic structure of the lens drive device concerning Embodiment 2 of this invention. It is a figure for demonstrating one part schematic structure of the drive mechanism of the lens drive device shown in FIG. It is a top view for demonstrating the position of the action point of the driving force of the drive mechanism in the lens drive device shown in FIG. 11, and the position of the action point of the spring force of a leaf | plate spring.

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

[Embodiment 1]
(Schematic configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to a first embodiment of the present invention. FIG. 2 is a plan view for explaining a schematic configuration of the lens driving device 1 shown in FIG. FIG. 3 is a longitudinal sectional view for explaining a schematic configuration of the lens driving device 1 shown in FIG.

  The lens driving device 1 of this embodiment is used in a relatively small camera mounted on a mobile phone or the like, and has a shake correction function for correcting camera shake. As shown in FIG. 1, for example, the lens driving device 1 is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape as a whole. That is, 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 with the optical axis L as the center.

  In the following description, as shown in FIG. 1, the three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. In this embodiment, the Z direction is the optical axis direction of the lens driving device 1, the X direction is a first direction orthogonal to the optical axis direction, and the Y direction is orthogonal to the optical axis direction and the first direction. The second direction. In this embodiment, the four side surfaces of the lens driving device 1 are parallel to the X direction or the Y direction. Further, in the lens driving device 1 of this embodiment or the camera in which the lens driving device 1 is mounted, an imaging element (not shown) is disposed on the Z2 direction side (see FIG. 3), and the Z1 direction side (see FIG. 3). The subject placed in 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).

  As shown in FIGS. 1 to 3, the lens driving device 1 includes a movable body 5 that holds the photographing lenses 2 to 4 and is movable in an optical axis direction and a direction substantially orthogonal to the optical axis direction, and an optical axis. A fixed body 6 that holds the movable body 5 and a drive mechanism 7 that drives the movable body 5 are provided so that the movable body 5 can move in a direction substantially orthogonal to the direction and the optical axis direction. The movable body 5 is movably held by the fixed body 6 via a leaf spring 8 as a spring member. The lens driving device 1 also includes a movable range restricting mechanism (not shown) for restricting the amount of movement of the movable body 5 in the optical axis direction, the X direction, and the Y direction.

  The movable body 5 includes a sleeve 9 to which the lenses 2 to 4 are fixed on the inner peripheral side. The sleeve 9 is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape, and the outer shape of the sleeve 9 when viewed from the optical axis direction is a substantially rectangular shape. That is, in this embodiment, the movable body 5 as a whole is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape, and the outer shape of the movable body 5 when viewed from the optical axis direction is a substantially rectangular shape. In this embodiment, the three lenses 2 to 4 are fixed on the inner peripheral side of the sleeve 9, but the number of lenses fixed to the sleeve 9 may be one or two. It may be 4 or more.

  The outer peripheral surface of the sleeve 9 is constituted by four plane portions 9a substantially parallel to the X direction or the Y direction. In addition, as shown in FIG. 2, recesses 9 b in which drive magnets 15, which will be described later, constituting the drive mechanism 7 are disposed, are formed at four locations on the outer peripheral side of the sleeve 9. Specifically, the recesses 9b are formed so as to be recessed inward in the X direction or the Y direction from the approximate center positions of the four plane portions 9a in the X direction or the Y direction.

  The fixed body 6 includes a case body 10 constituting the outer peripheral surface of the lens driving device 1 and a base member 11. The case body 10 is formed, for example, in a substantially square cylindrical shape with a bottom having a bottom portion 10a and a cylindrical portion 10b. The case body 10 is disposed so as to surround the movable body 5 and the drive mechanism 7. The base member 11 is formed in a flat plate shape, for example, and is fixed to the opposite side of the case body 10.

  The leaf spring 8 is formed of a conductive material such as a stainless steel plate or a copper alloy. The leaf spring 8 includes a movable body fixing portion 8a fixed to the movable body 5, a fixed body fixing portion 8b fixed to the fixed body 6, and an arm portion connecting the movable body fixing portion 8a and the fixed body fixing portion 8. 8c. The thickness of the arm portion 8c is thinner than the width of the arm portion 8c. Further, as shown in FIG. 2, the arm portion 8c includes two long arm portions 8d and 8e that are formed in an elongated linear shape, and a short arm that is formed in a linear shape and shorter than the long arm portions 8d and 8e. 8f.

  A fixed body fixing portion 8b is connected to one end of the long arm portion 8d. One end of the long arm portion 8e is connected to the other end of the long arm portion 8d. Specifically, one end of the long arm portion 8e is connected to the other end of the long arm portion 8d so that the longitudinal direction of the long arm portion 8d and the longitudinal direction of the long arm portion 8e are different by 90 °. One end of the short arm portion 8f is connected to the other end of the long arm portion 8e. Specifically, one end of the short arm portion 8f is connected to the other end of the long arm portion 8e so that the short arm portion 8f and the long arm portion 8d are substantially parallel to each other. A movable body fixing portion 8a is connected to the other end of the short arm portion 8f.

  In this embodiment, a plurality of leaf springs 8 are disposed on both ends of the movable body 5 in the optical axis direction. Specifically, four leaf springs 8 are disposed on the subject side of the movable body 5, and four leaf springs 8 are disposed on the non-subject side of the movable body 5. More specifically, as shown in FIG. 2, on the subject side of the movable body 5, the movable body fixing portions 8a are fixed to the four corners of the movable body 5, and the longitudinal directions of the long arm portions 8d and 8e are the X direction. Alternatively, the four leaf springs 8 are arranged with rotational symmetry of 90 ° about the optical axis L so as to be substantially parallel to the Y direction. Similarly, on the opposite side of the movable body 5, the movable body fixing portions 8 a are fixed to the four corners of the movable body 5, and the longitudinal directions of the long arm portions 8 d and 8 e are substantially parallel to the X direction or the Y direction. In addition, four leaf springs 8 are arranged with a rotational symmetry of 90 ° about the optical axis L.

  In addition, the four leaf springs 8 disposed on the subject side of the movable body 5 and the four leaf springs 8 disposed on the opposite subject side of the movable body 5 are orthogonal to the optical axis L and have an optical axis. It arrange | positions so that it may become substantially plane symmetrical with respect to the plane P (refer FIG. 3) which passes the center position of the movable body 5 in a direction. That is, when viewed from the optical axis direction, the four leaf springs 8 disposed on the subject side of the movable body 5 and the four leaf springs 8 disposed on the opposite subject side of the movable body 5 overlap each other. Yes.

  As described above, the thickness of the arm portion 8c is thinner than the width of the arm portion 8c. In this embodiment, the leaf spring 8 is arranged so that the thickness direction of the leaf spring 8 substantially coincides with the optical axis direction. That is, in this embodiment, the spring constant of the leaf spring 8 in the optical axis direction is smaller than the spring constant of the leaf spring 8 in the direction substantially orthogonal to the optical axis direction.

  In this embodiment, the long arm portions 8d and 8e arranged so that the longitudinal direction thereof is substantially parallel to the X direction are first arm portions whose longitudinal direction is substantially parallel to the first direction, The long arm portions 8d and 8e arranged so that the longitudinal direction thereof is substantially parallel to the Y direction are second arm portions whose longitudinal direction is a direction substantially parallel to the second direction.

  The drive mechanism 7 includes eight drive magnets 15, a drive coil 16 wound along the outer peripheral surface of the sleeve 9, and eight drive coils 17 wound in a substantially rectangular air core shape. And. Hereinafter, a detailed configuration of the drive mechanism 7 will be described.

(Configuration of drive mechanism)
FIG. 4 is a view for explaining the configuration of the drive mechanism 7 shown in FIG. 2 from the side. FIG. 5 is a view for explaining the relationship between the drive magnet 15 and the drive coils 16 and 17 in the E part of FIG. FIG. 6 is a view for explaining the relationship between the drive magnet 15 and the drive coils 16 and 17 in the F part of FIG.

  The drive magnet 15 is formed in a substantially rectangular plate shape and is fixed to the fixed body 6. Four of the eight drive magnets 15 are arranged in the recess 9b of the sleeve 9, as shown in FIG. Specifically, the surface of the driving magnet 15 disposed in the recess 9b formed so as to be recessed toward the inside in the X direction is substantially parallel to the Y direction and is recessed toward the inside in the Y direction. Each of the four drive magnets 15 is disposed in the recess 9b so that the surface of the drive magnet 15 disposed in the recess 9b formed to be substantially parallel to the X direction. The remaining four drive magnets 15 are arranged so as to face the drive magnet 15 arranged in the recess 9b with a predetermined gap. Specifically, the driving magnets 15 arranged in the recess 9b and the remaining four driving magnets 15 are opposed to each other so that the opposed surfaces 15a of the driving magnets 15 facing each other are substantially parallel to each other. Has been. In other words, the drive magnets 15 are arranged to face each other at four locations on the outer peripheral side of the sleeve 9 at approximately the center position in the X direction or the Y direction.

  Further, the driving magnets 15 opposed to each other in the X direction overlap almost completely when viewed from the X direction, and the driving magnets 15 opposed to each other in the Y direction overlap almost completely when viewed from the Y direction. In addition, the driving magnet 15 disposed in the recess 9b and the remaining four driving magnets 15 are disposed to face each other. In this embodiment, the driving magnet 15 is magnetized so that the magnetic pole formed on the opposing surface 15a is a single pole (that is, the entire opposing surface 15a is an S pole or an N pole), And the drive magnet 15 is arrange | positioned so that the opposing surface 15a which mutually opposes may become a different magnetic pole. Therefore, a magnetic field region having a uniform magnetic flux density is formed between the two drive magnets 15 facing each other. Further, a magnetic flux substantially parallel to the X direction is generated between the two driving magnets 15 opposed in the X direction, and the Y direction is interposed between the two driving magnets 15 opposed in the Y direction. A substantially parallel magnetic flux is generated.

  As described above, the driving coil 16 is wound along the outer peripheral surface of the sleeve 9. For example, the drive coil 16 is wound along the outer peripheral surface of the sleeve 9 so that the center of the drive coil 16 and the center of the sleeve 9 substantially coincide with each other in the optical axis direction. The driving coil 17 is wound in a substantially rectangular air core shape. Specifically, the drive coil 17 is wound in a substantially rectangular flat plate shape, and as shown in FIG. 4, two long side portions 17a and 17b that are substantially parallel to each other and a long and substantially parallel to each other. It is comprised by the two short side parts 17c and 17d shorter than the side parts 17a and 17b.

  The driving coil 17 is fixed to the outer peripheral surface of the driving coil 16. Specifically, the drive coil 17 is driven such that the short sides 17c and 17d are substantially parallel to the optical axis direction and the two drive coils 17 are adjacent in the X direction or the Y direction. The outer coil 16 is fixed to the outer peripheral surface. That is, as shown in FIG. 4, the driving coil 17 is fixed to the outer peripheral surface of the driving coil 16 so that the two short sides 17 c are adjacent in the X direction or the Y direction. Further, the drive coil 17 is fixed to the outer peripheral surface of the drive coil 16 so that the two adjacent short side portions 17c are arranged at substantially the center positions of the four plane portions 9a of the sleeve 9. In addition, two driving coils 17 are arranged on the outer side of each flat portion 9a. The driving coil 17 is fixed to the outer peripheral surface of the driving coil 16 so that the center of the driving coil 17 and the center of the sleeve 9 in the optical axis direction substantially coincide with each other. In this embodiment, the driving coil 17 is wound so that currents in the same direction flow through the short side portions 17c adjacent to each other.

  As described above, the drive coil 16 is wound along the outer peripheral surface of the sleeve 9, and a part of the drive coil 16 is disposed between the drive magnets 15 arranged to face each other. . Further, the drive coil 17 is fixed to the outer peripheral surface of the drive coil 16 so that the two adjacent short side portions 17c are arranged at substantially the center positions of the four plane portions 9a of the sleeve 9. In addition, a part of the long side portions 17a and 17b and the short side portion 17c are arranged between the driving magnets 15 arranged to face each other.

  In the present embodiment, the direction of the magnetic flux generated between the driving magnets 15 arranged opposite to each other in the Y direction and the optical axis direction are formed on a part of the driving coil 16 arranged along the plane portion 9a parallel to the X direction. A current flows in a direction substantially orthogonal to each other, and a part of the driving coil 16 arranged along the plane portion 9a parallel to the Y direction is generated between the driving magnets 15 arranged to face each other in the X direction. A current flows in a direction substantially orthogonal to the direction of the magnetic flux and the direction of the optical axis. Therefore, when a current is supplied to the driving coil 16, a driving force in the optical axis direction is generated in the movable body 5 by the action of the driving magnet 15 and the driving coil 16 that are arranged to face each other. That is, in this embodiment, the eight drive magnets 15 and the drive coil 16 constitute a first drive mechanism for driving the movable body 5 in the optical axis direction.

  In this embodiment, since a current flows in the short side portion 17c in the optical axis direction, a current flows in the driving coil 17 attached to the outside of the plane portion 9a parallel to the X direction with the Y direction as the thickness direction. When supplied, a driving force in the X direction is generated in the movable body 5 by the action of the driving coil 17 and the driving magnet 15 arranged opposite to the Y direction. That is, in the present embodiment, the movable body 5 is moved in the X direction by the four driving coils 17 attached to the outside of the plane portion 9a parallel to the X direction and the four driving magnets 15 arranged to face each other in the Y direction. A second drive mechanism for driving the motor is configured.

  Further, when a current is supplied to the driving coil 17 attached to the outer side of the flat portion 9a parallel to the Y direction with the X direction as the thickness direction, the driving coil 17 is arranged to face the driving coil 17 in the X direction. Due to the action of the magnet 15, a driving force in the Y direction is generated in the movable body 5. In other words, in this embodiment, the movable body 5 is moved in the Y direction by the four driving coils 17 attached to the outside of the plane portion 9a parallel to the Y direction and the four driving magnets 15 arranged opposite to each other in the X direction. A third drive mechanism for driving to the right is configured.

  As shown in FIGS. 5 and 6, the length of the driving magnet 15 in the optical axis direction is longer than the width of the driving coil 16 and the lengths of the short sides 17c and 17d of the driving coil 17 in the optical axis direction. It has become. Specifically, the length of the driving magnet 15 in the optical axis direction is longer than the sum of the width of the driving coil 16 in the optical axis direction and the movable amount of the movable body 5 in the optical axis direction, and has a short side. It is longer than the sum of the lengths of the portions 17c and 17d and the movable amount of the movable body 5 in the optical axis direction.

  Further, in this embodiment, as shown in FIGS. 5A and 6A, even if the movable body 5 moves within the movable range in the optical axis direction, the drive magnets 15 are arranged so as to face each other. The drive magnet 15 and the drive coils 16 and 17 are arranged so that the drive coils 16 and 17 are not detached from the magnetic field region formed in the optical axis direction. That is, in the present embodiment, the entire region of the movable body 5 in the optical axis direction is disposed in the magnetic field region between the driving magnets 15, the entire region of the driving coil 16 in the optical axis direction being opposed to each other, and The entire short side portions 17c and 17d are arranged in a magnetic field region between the driving magnets 15 arranged to face each other.

  As shown in FIGS. 2 and 4, the length in the Y direction of the plane portion 9 a parallel to the Y direction is longer than the length in the Y direction of the driving magnets 15 that are arranged to face each other in the X direction. Specifically, the length in the Y direction of the plane portion 9a parallel to the Y direction is the sum of the length in the Y direction of the driving magnet 15 arranged opposite to the X direction and the movable amount of the movable body 5 in the Y direction. Longer than.

  Further, in this embodiment, even if the movable body 5 moves within the movable range in the Y direction, a plane portion parallel to the Y direction is formed from the magnetic field region formed between the driving magnets 15 opposed to each other in the X direction. A drive magnet 15 is arranged so that 9a does not come off in the Y direction. That is, in this embodiment, the driving coil 16 is arranged in the whole area in the Y direction of the magnetic field area between the driving magnets 15 arranged to face each other in the X direction in the whole movable range of the movable body 5 in the Y direction. .

  In addition, as shown in FIG. 6B, even if the movable body 5 moves within the movable range in the Y direction, the magnetic field region formed between the driving magnets 15 arranged to face each other in the X direction The driving magnet 15 and the driving coil 17 are arranged so that the short side portion 17c of the driving coil 17 attached to the outside of the plane portion 9a parallel to the direction does not come off in the Y direction. That is, in this embodiment, the entire short side portion 17c is arranged in the magnetic field region between the driving magnets 15 arranged to face each other in the X direction over the entire movable range of the movable body 5 in the Y direction.

  Similarly, the length in the X direction of the plane portion 9a parallel to the X direction is greater than the sum of the length in the X direction of the driving magnet 15 disposed opposite to the Y direction and the movable amount of the movable body 5 in the X direction. It is getting longer. Further, in this embodiment, even if the movable body 5 moves within the movable range in the X direction, a plane portion parallel to the X direction from the magnetic field region formed between the driving magnets 15 arranged to face each other in the Y direction. The drive magnet 15 is arranged so that 9a does not come off in the X direction. In other words, in this embodiment, the driving coil 16 is arranged in the entire area in the X direction of the magnetic field region between the driving magnets 15 arranged to face each other in the Y direction in the entire movable range of the movable body 5 in the X direction. .

  Further, even if the movable body 5 moves within the movable range in the X direction, the magnetic field region formed between the driving magnets 15 arranged to face each other in the Y direction is outside the flat portion 9a parallel to the X direction. The drive magnet 15 and the drive coil 17 are arranged so that the short side portion 17c of the drive coil 17 to be attached does not come off in the X direction. That is, in the present embodiment, the entire short side portion 17c is arranged in the magnetic field region between the driving magnets 15 arranged to face each other in the Y direction over the entire movable range of the movable body 5 in the X direction.

  Therefore, even if the movable body 5 moves in the optical axis direction, the X direction, and the Y direction, the volume of the driving coil 16 and the two driving coils 17 arranged between the driving magnets 15 arranged to face each other. The volume of the short side portion 17c is not changed. That is, the volume of the drive coil 16 and the volume of the two short side portions 17c arranged in the magnetic field region formed between the drive magnets 15 are in the optical axis direction, the X direction, and the Y direction of the movable body 5. It is substantially constant within the movable range of the movable body 5.

  In addition, as described above, in this embodiment, since a magnetic field region having a uniform magnetic flux density is formed between the driving magnets 15 facing each other, the movable body 5 in the optical axis direction, the X direction, and the Y direction is formed. Within the movable range, the driving force of the movable body 5 in the optical axis direction, the X direction, and the Y direction by the drive mechanism 7 is substantially constant.

  Each of the both end sides of the conducting wire forming the drive coil 16 is soldered to each of two plate springs 8 out of a total of eight plate springs 8 disposed on both sides of the movable body 5 in the optical axis direction. It is fixed by. The four driving coils 17 attached to the outside of the plane portion 9a parallel to the X direction are formed by sequentially winding one conducting wire, and both ends of the conducting wire forming this driving coil 17 are formed. Each of the sides is soldered to each of the two leaf springs 8 of the remaining six leaf springs 8 except for the two leaf springs 8 to which the both ends of the conducting wire of the drive coil 16 are fixed. It is fixed by etc. Further, the four drive coils 17 attached to the outside of the plane portion 9a parallel to the Y direction are formed by winding one conductive wire in sequence, and the conductive wires forming the drive coil 17 The two ends of each of the two are fixed to the two leaf springs 8 to which both ends of the conductor of the driving coil 16 are fixed and the ends of the conductor of the driving coil 17 attached to the outside of the flat portion 9a parallel to the X direction. Each of the remaining four plate springs 8 except for the two plate springs 8 is fixed to each of the two plate springs 8 by soldering or the like.

  Alternatively, one end side of the conducting wire of the driving coil 16, one end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9 a parallel to the X direction and driving side attached to the outside of the plane portion 9 a parallel to the Y direction. One end side of the conducting wire of the coil 17 is fixed to each of the three leaf springs 8 of the four leaf springs 8 arranged on the side opposite to the subject by soldering or the like, and the conducting wire of the driving coil 16 is connected. The other end of the conducting wire of the driving coil 17 attached to the other end side, the other end side of the driving coil 17 attached to the outside of the plane portion 9a parallel to the X direction and the other end of the conducting coil 17 attached to the outside of the plane portion 9a parallel to the Y direction. The other side is fixed to the remaining one leaf spring 8 disposed on the opposite object side by soldering or the like.

  The driving coil 16 is attached to one end side of the conducting wire of the driving coil 16, the one end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9 a parallel to the X direction and the outside of the planar portion 9 a parallel to the Y direction. Each of the one end side of the conducting wire of the coil 17 is fixed to each of the three leaf springs 8 of the eight leaf springs 8 by soldering or the like, and the other end side of the conducting wire of the driving coil 16, X Two of the other end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9a parallel to the direction and the other end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9a parallel to the Y direction. One of the remaining five leaf springs 8 is fixed to one leaf spring 8 by soldering or the like, and is parallel to the other end side of the conducting wire of the driving coil 16 not fixed to the leaf spring 8 in the X direction. Outside the flat part 9a One of the other end side of the conducting wire of the driving coil 17 to be attached and the other end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9a parallel to the Y direction is the remaining four leaf springs 8. It may be fixed to one of the leaf springs 8 by soldering or the like.

  Further, each of the three leaf springs 8 out of the four leaf springs 8 including the two leaf springs 8 disposed on the subject side and the two leaf springs 8 disposed on the opposite subject side is driven. Of the driving coil 17 attached to one end side of the conducting wire of the coil for driving 16, one end side of the conducting wire of the driving coil 17 attached to the outside of the flat portion 9 a parallel to the X direction and the outside of the flat portion 9 a parallel to the Y direction. Each one end side of the conducting wire is fixed, and the driving coil 17 attached to the remaining one leaf spring 8 on the other end side of the conducting wire of the driving coil 16 and outside the flat portion 9a parallel to the X direction. The other end side of the lead wire of the driving coil 17 attached to the other end side of the lead wire and the outside of the flat portion 9a parallel to the Y direction may be fixed.

  In this embodiment, the drive coil 16 is a first drive coil, and the drive coil 17 attached to the outside of the flat portion 9a parallel to the X direction is a second drive coil and parallel to the Y direction. The driving coil 17 attached to the outside of the flat surface portion 9a is a third driving coil. Further, in this embodiment, the eight drive magnets 15 (four sets of drive magnets 15) are first drive magnets, and four drive magnets 15 (two sets of pairs) arranged opposite to each other in the Y direction. The drive magnets 15) are second drive magnets, and the four drive magnets 15 (two sets of drive magnets 15) arranged to face each other in the X direction are third drive magnets. That is, the first driving magnet is common to the second driving magnet (that is, the four driving magnets 15 arranged opposite to each other in the Y direction) and the third driving magnet is common (that is, And four driving magnets 15) opposed to each other in the X direction.

  Further, in this embodiment, the magnetic field region formed between the four sets of driving magnets 15 is the first magnetic field region, and is formed between the two sets of driving magnets 15 arranged to face each other in the Y direction. The magnetic field region is a second magnetic field region, and the magnetic field region formed between the two sets of driving magnets 15 arranged to face each other in the X direction is a third magnetic field region.

  Furthermore, in this embodiment, each side portion of the driving coil 16 substantially parallel to the X direction or the Y direction is a first effective coil portion. The short side portion 17c of the driving coil 17 attached to the outside of the flat portion 9a parallel to the X direction is a second effective coil portion, and the driving coil attached to the outside of the flat portion 9a parallel to the Y direction. A short side portion 17c of 17 is a third effective coil portion.

  Furthermore, in this embodiment, the long side portions 17a and 17b and the short side portions 17c and 17d of the driving coil 17 attached to the outside of the plane portion 9a parallel to the X direction are the second straight side portions, The short side portion 17c is a second effective side portion and a second adjacent side portion. Further, the long side portions 17a and 17b and the short side portions 17c and 17d of the driving coil 17 attached to the outside of the plane portion 9a parallel to the Y direction are third straight side portions, and the short side portion 17c of these is the third straight side portion. Is the third effective side and the third adjacent side. In this embodiment, the facing surface 15a of the driving magnet 15 facing in the Y direction is a second facing surface, and the facing surface 15a of the driving magnet 15 facing in the X direction is a third facing surface.

(Relationship between drive force of drive mechanism and spring force of leaf spring)
FIG. 7 is a plan view for explaining the position of the acting point of the driving force of the driving mechanism 7 and the position of the acting point of the spring force of the leaf spring 8 in the lens driving device 1 shown in FIG. FIG. 8 is a side view for explaining the position of the action point of the driving force of the drive mechanism 7 and the position of the action point of the spring force of the leaf spring 8 in the lens driving device 1 shown in FIG. FIG. 9 is a side view for explaining the position of the action point of the driving force of the drive mechanism 7 and the position of the action point of the spring force of the leaf spring 8 in the lens driving device 1 shown in FIG. 1 from the Y direction. FIG. 10 is a schematic perspective view for explaining the position of the center of gravity of the movable body 5 and the position of the action point of the spring force of the leaf spring 8 shown in FIG.

  As described above, the movable body fixing portions 8a of the leaf springs 8 are fixed to the four corners on the subject side and the opposite subject side of the movable body 5. That is, the movable body 5 has eight spring force action points SP1 to SP8 where the movable body fixing portion 8a is fixed and the spring force of the leaf spring 8 acts. In this embodiment, there are spring force action points SP1 to SP4 at the four corners of the movable body 5 on the subject side, and spring force action points SP5 to SP8 at the four corners of the movable body 5 on the opposite subject side.

  Further, as described above, on the subject side of the movable body 5, the four leaf springs 8 are arranged in a rotational symmetry of 90 ° with respect to the optical axis L. As shown in FIG. When viewed from the axial direction, the spring force action point SP1 and the spring force action point SP3 are arranged substantially symmetrically with respect to the optical axis L, and the spring force action point SP2 and the spring force action point SP4 are located on the optical axis L. It is arranged substantially symmetrical with respect to the point. In other words, in this embodiment, there are two pairs of spring force action points that are arranged substantially symmetrically with respect to the optical axis L when viewed from the optical axis direction on the subject side of the movable body 5. Further, when viewed from the optical axis direction, a square T1 is formed by the spring force action points SP1 to SP4 as shown in FIG.

  Similarly, on the side opposite to the subject of the movable body 5, the four leaf springs 8 are arranged with rotational symmetry of 90 ° about the optical axis L, and when viewed from the optical axis direction, On the other hand, the spring force application point SP5 and the spring force application point SP7 are arranged substantially symmetrically, and the spring force application point SP6 and the spring force application point SP8 are arranged substantially symmetrical. In other words, in this embodiment, a pair of spring force action points SP5 and SP7 and a pair of springs are arranged on the opposite side of the movable body 5 on the opposite side of the movable body 5 with respect to the optical axis L when viewed from the optical axis direction. There are two sets of spring force action points, force action points SP6 and SP8. Further, when viewed from the optical axis direction, a quadrangle T2 is formed by the spring force action points SP5 to SP8.

  As described above, the four leaf springs 8 arranged on the subject side of the movable body 5 and the four leaf springs 8 arranged on the opposite subject side of the movable body 5 are in relation to the plane P. As shown in FIG. 8, when viewed from the X direction, the spring force application point SP1 and the spring force application point with respect to the intersection CP of the plane P and the optical axis L when viewed from the X direction. SP7 is arranged approximately point-symmetrically, the spring force action point SP2 and the spring force action point SP8 are arranged substantially point-symmetrically, the spring force action point SP3 and the spring force action point SP5 are arranged substantially point-symmetrically, The spring force action point SP4 and the spring force action point SP6 are arranged substantially symmetrically. That is, in this embodiment, there are four pairs of spring force action points that are arranged substantially symmetrically with respect to the intersection point CP when viewed from the X direction. Further, when viewed from the X direction, a square T3 is formed by the spring force action points SP1 to SP8 as shown in FIG.

  Similarly, when viewed from the Y direction, as shown in FIG. 9, the spring force action point SP1 and the spring force action point SP7 are arranged substantially symmetrically with respect to the intersection CP, and the spring force action point SP2 and the spring force point are arranged. The force application point SP8 is arranged approximately point-symmetrically, the spring force application point SP3 and the spring force application point SP5 are arranged approximately point-symmetrically, and the spring force application point SP4 and spring force application point SP6 are substantially point symmetrical. Is arranged. That is, in this embodiment, there are four pairs of spring force action points that are arranged substantially symmetrically with respect to the intersection point CP when viewed from the Y direction. Further, when viewed from the Y direction, a square T4 is formed by the spring force action points SP1 to SP8 as shown in FIG.

  In this embodiment, the leaf springs 8 having the same shape are disposed on the subject side and the opposite subject side of the movable body 5, and the acting forces of the leaf springs 8 at the spring force acting points SP1 to SP8 are substantially equal. That is, the acting force of the leaf spring 8 in the optical axis direction at each spring force acting point SP1 to SP8 is equal, the acting force of the leaf spring 8 in the X direction at each spring force acting point SP1 to SP8 is equal, and each spring force. The acting force of the leaf spring 8 in the Y direction at the action points SP1 to SP8 is equal.

  Therefore, in this embodiment, the first restoring force centroid SZ that is the centroid of the restoring force of the movable body 5 in the optical axis direction by the eight leaf springs 8 when the movable body 5 moves in the optical axis direction is the optical axis. When viewed from the direction, it substantially coincides with the optical axis L. Further, the second restoring force center of gravity SX, which is the center of gravity of the restoring force of the movable body 5 in the X direction by the eight leaf springs 8 when the movable body 5 moves in the X direction, is an intersection when viewed from the X direction. It almost coincides with CP. The third restoring force center of gravity SY, which is the center of gravity of the restoring force of the movable body 5 in the Y direction by the eight leaf springs 8 when the movable body 5 moves in the Y direction, is an intersection when viewed from the Y direction. It almost coincides with CP. Further, in this embodiment, when viewed from the optical axis direction, the intersection point CP, the second restoring force centroid SX, and the third restoring force centroid SY substantially coincide.

  As described above, when a current is supplied to the driving coil 16, the driving magnet 15 and the driving coil 16 that are arranged to face each other are arranged between the driving magnets 15 that are arranged to face each other. A driving force in the optical axis direction is generated in a part of the driving coil 16. That is, the movable body 5 around which the driving coil 16 is wound has four first driving force application points DP1 to DP4 where the driving force in the optical axis direction acts as shown in FIG.

  Further, as described above, the driving magnets 15 are arranged to face each other at four locations at the substantially central position in the X direction or Y direction on the outer peripheral side of the sleeve 9. That is, there are four first driving force action points DP1 to DP4 at approximately four central positions in the X direction or Y direction of the movable body 5, and when viewed from the optical axis direction as shown in FIG. On the other hand, the first driving force action point DP1 and the first driving force action point DP3 are arranged substantially point-symmetrically, and the first driving force action point DP2 and the first driving force action point DP4 are arranged substantially point-symmetrically. Yes. That is, in this embodiment, the movable body 5 has two pairs of first driving force action points that are arranged substantially symmetrically with respect to the optical axis L when viewed from the optical axis direction. Further, in the present embodiment, the first driving force action points DP1 to DP4 are arranged with a rotational symmetry of 90 ° with the optical axis L as the center.

  In the present embodiment, the driving forces acting on the first driving force action points DP1 to DP4 are substantially equal. For this reason, the first driving force center of gravity DZ, which is the center of gravity of the driving force in the optical axis direction by the driving mechanism 7, substantially coincides with the optical axis L when viewed from the optical axis direction. That is, in this embodiment, when viewed from the optical axis direction, the first driving force gravity center DZ and the first restoring force gravity center SZ substantially coincide. Further, when viewed from the optical axis direction, the first driving force gravity center DZ is arranged in the quadrangles T1 and T2. As described above, for example, the driving coil 16 is wound along the outer peripheral surface of the sleeve 9 so that the center of the driving coil 16 and the center of the sleeve 9 substantially coincide with each other in the optical axis direction. In this case, the first driving force centroid DZ and the first restoring force centroid SZ substantially coincide with each other when viewed from a direction orthogonal to the optical axis direction.

  Further, as described above, when a current is supplied to the driving coil 17 attached to the outer side of the plane portion 9a parallel to the X direction, the driving magnet 15 disposed opposite to the driving coil 17 in the Y direction, As a result, a driving force in the X direction is generated in the short side portion 17 c of the driving coil 17. That is, as shown in FIG. 8, the movable body 5 to which the driving coil 17 is attached has two second driving force action points DP5 and DP6 where the driving force in the X direction acts.

  Further, two adjacent short side portions 17c are fixed to the outer peripheral surface of the driving coil 16 so that the center of the short side portion 17c and the center of the sleeve 9 in the optical axis direction substantially coincide with each other. As shown in FIG. 8, when viewed from the X direction, the second driving force action point DP5 and the second driving force action point DP6 are arranged substantially point-symmetrically with respect to the intersection point CP. That is, in this embodiment, the movable body 5 has a pair of second driving force action points that are arranged substantially symmetrically with respect to the intersection point CP when viewed from the X direction.

  In the present embodiment, the driving forces acting on the second driving force action points DP5 and DP6 are substantially equal. Therefore, the second driving force center of gravity DX, which is the center of gravity of the driving force in the X direction by the driving mechanism 7, substantially coincides with the intersection point CP when viewed from the X direction. That is, in this embodiment, when viewed from the X direction, the second driving force gravity center DX and the second restoring force gravity center SX substantially coincide with each other. Further, when viewed from the X direction, the second driving force gravity center DX is disposed in the quadrangle T3. Further, in this embodiment, two adjacent short side portions 17c are fixed to the outer peripheral surface of the driving coil 16 so as to be disposed at a substantially central position of the plane portion 9a parallel to the X direction, and the optical axis Even when viewed from the direction, the second driving force gravity center DX and the second restoring force gravity center SX substantially coincide.

  Further, as described above, when a current is supplied to the driving coil 17 attached to the outside of the plane portion 9a parallel to the Y direction, the driving magnet 15 disposed opposite to the driving coil 17 in the X direction, As a result, a driving force in the Y direction is generated in the short side portion 17 c of the driving coil 17. That is, as shown in FIG. 9, the movable body 5 to which the driving coil 17 is attached has two second driving force action points DP7 and DP8 where the driving force in the Y direction acts.

  Further, two adjacent short side portions 17c are fixed to the outer peripheral surface of the driving coil 16 so that the center of the short side portion 17c and the center of the sleeve 9 in the optical axis direction substantially coincide with each other. As shown in FIG. 9, when viewed from the Y direction, the third driving force action point DP7 and the second driving force action point DP8 are arranged substantially point-symmetrically with respect to the intersection point CP. In other words, in the present embodiment, the movable body 5 has a pair of third driving force action points that are arranged substantially point-symmetrically with respect to the intersection point CP when viewed from the Y direction.

  In the present embodiment, the driving forces acting on the third driving force action points DP7 and DP8 are substantially equal. Therefore, the third driving force centroid DY, which is the centroid of the driving force in the Y direction by the driving mechanism 7, substantially coincides with the intersection point CP when viewed from the Y direction. That is, in this embodiment, when viewed from the Y direction, the third driving force gravity center DY and the third restoring force gravity center SY substantially coincide. Further, when viewed from the Y direction, the third driving force gravity center DY is disposed in the quadrangle T4. In the present embodiment, the two adjacent short side portions 17c are fixed to the outer peripheral surface of the driving coil 16 so as to be arranged at a substantially central position of the plane portion 9a parallel to the Y direction, and the optical axis Even when viewed from the direction, the third driving force gravity center DY and the third restoring force gravity center SY substantially coincide.

  Here, in this embodiment, the optical axis direction between the plane P (that is, the plane including the second driving force center of gravity DX and the third driving force center of gravity DY) and the spring force action points SP1 to SP4 on the subject side of the movable body 5. And the distance R2 in the optical axis direction between the plane P and the spring force action points SP5 to SP8 on the side opposite to the subject of the movable body 5 are substantially equal to each other. Further, the acting force of the leaf spring 8 in the X direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction and the spring force acting point SP5 when the movable body 5 moves in the X direction. The acting force of the leaf spring 8 in the X direction at SP8 is substantially equal, and the acting force of the leaf spring 8 in the Y direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction, and the Y direction. The acting force of the leaf spring 8 in the Y direction at the spring force acting points SP5 to SP8 when the movable body 5 is moved to is substantially equal.

  In other words, in this embodiment, the product of the acting force of the leaf spring 8 in the X direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction, and the movable body 5 in the X direction. The product of the acting force of the leaf spring 8 in the X direction and the distance R2 at the spring force acting points SP5 to SP8 when moved is substantially equal. Further, when the movable body 5 moves in the Y direction, the product of the acting force of the leaf spring 8 in the Y direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction. The product of the acting force of the leaf spring 8 in the Y direction and the distance R2 at the spring force acting points SP5 to SP8 is substantially equal.

  As described above, there are spring force action points SP1 to SP4 at the four corners on the subject side of the movable body 5, and spring force action points SP5 to SP8 at the four corners on the opposite side of the movable body 5. Therefore, as shown in FIG. 10, in this embodiment, the center of gravity G of the movable body 5 is inside a rectangular parallelepiped or a cube formed by the spring force action points SP1 to SP8.

  In this embodiment, the squares T1 and T2 are n0 squares formed by a plurality of spring force action points SP1 to SP8 when viewed from the optical axis direction, and the squares T3 are viewed from the X direction. The square T4 is an n2 prism formed by the plurality of spring force application points SP1 to SP8 when viewed from the Y direction. The intersection point CP is a predetermined first reference point, second reference point, third reference point, and fourth reference point. Further, the plane P is a first plane that is orthogonal to the optical axis direction and includes the second driving force centroid DX, and is a second plane that is orthogonal to the optical axis direction and includes the third driving force centroid DY. The optical axis L when viewed from the optical axis direction is a predetermined zeroth reference point and fifth reference point.

(Schematic operation of the lens driving device)
In the lens driving device 1 configured as described above, the movable body 5 moves in the direction of the optical axis and the focus is adjusted when shooting is performed with a camera on which the lens driving device 1 is mounted. When a camera shake is detected by a sensor (not shown) such as a gyroscope (angular velocity sensor), a current is supplied to the drive coil 17 based on the detection result of the sensor. The movable body 5 moves in the X direction and / or the Y direction, and the shake is corrected.

  It should be noted that the current required for correcting the image shake caused by the shake by moving the movable body 5 in the X direction and / or the Y direction is determined based on the shake amount of the camera detected by the sensor. The amount of current supplied to the drive coil 17 may be controlled by open control supplied to the drive coil 17. Further, the amount of current supplied to the drive coil 17 is controlled by the closed control that supplies the current necessary for correcting the image shake due to the shake to the drive coil 17 while monitoring the shake correction result. May be.

  Here, the sensor for detecting the shake is disposed inside the camera on which the lens driving device 1 is mounted. Alternatively, the sensor for detecting the shake is disposed inside the case body 10 of the lens driving device 1. In some cases, a sensor that detects vibration is attached to the movable body 5. As described above, various sensor arrangement positions are conceivable. However, in the case of open control, the movable body 5 in the X direction and / or the Y direction is based on the detection result of the sensor regardless of the sensor arrangement position. The amount of movement is controlled, and the lateral shift of the captured image due to shake is corrected. In the case of closed control, first, the movable body 5 is moved in the X direction and / or the Y direction based on the detection result of the sensor, and then the displacement amount of the movable portion 5 is used as a monitor of the shake correction result. The lateral shift of the photographed image due to the shake is corrected by performing feedback control that is detected by a sensor such as a magnetic sensor or an optical sensor (not shown) and that controls the amount of movement of the movable body 5 in the X direction and / or the Y direction. .

  As a method for detecting the shake amount, a detection method using a gyroscope is generally used, but camera shake may be detected based on an image photographed by the camera. That is, camera shake may be detected by image processing, and based on the detection result, the movable body 5 may be moved in the X direction and / or Y direction to correct the shake. Further, as a monitor of the shake correction result, a method of calculating and detecting an image shift amount may be employed.

(Main effects of this form)
As described above, in this embodiment, when viewed from the optical axis direction, the first driving force gravity center DZ is disposed in the quadrangles T1 and T2 formed by the spring force action points SP1 to SP8. Therefore, even when the movable body 5 is moving in a direction substantially orthogonal to the optical axis direction, the inclination of the movable body 5 with respect to the optical axis direction when the movable body 5 is driven in the optical axis direction is suppressed. Is possible. In particular, in this embodiment, when viewed from the optical axis direction, the first driving force gravity center DZ and the first restoring force gravity center SZ substantially coincide with each other, so that the movable body 5 moves in a direction substantially orthogonal to the optical axis direction. Even in this case, it is possible to eliminate the inclination of the movable body 5 with respect to the optical axis direction when the movable body 5 is driven in the optical axis direction.

  In this embodiment, when viewed from the X direction, the second driving force center of gravity DX is disposed in the quadrangle T3 formed by the spring force action points SP1 to SP8, so that the movable body 5 is positioned on the optical axis. Even when the movable body 5 is moving in the direction or the Y direction, it is possible to suppress the inclination of the movable body 5 with respect to the X direction when the movable body 5 is driven in the X direction. In particular, in this embodiment, the second driving force gravity center DX and the second restoring force gravity center SX substantially coincide with each other when viewed from the X direction, so that the movable body 5 moves in the optical axis direction and the Y direction. Even in this case, it is possible to eliminate the inclination of the movable body 5 with respect to the X direction when the movable body 5 is driven in the X direction.

  Furthermore, in this embodiment, when viewed from the Y direction, the third driving force center of gravity DY is disposed in the quadrangle T4 formed by the spring force action points SP1 to SP8, so that the movable body 5 is positioned on the optical axis. Even when the movable body 5 is moving in the direction or the X direction, it is possible to suppress the inclination of the movable body 5 with respect to the Y direction when the movable body 5 is driven in the Y direction. In particular, in this embodiment, the third driving force gravity center DY and the third restoring force gravity center SY substantially coincide with each other when viewed from the Y direction, so that the movable body 5 moves in the optical axis direction and the X direction. Even in this case, it is possible to eliminate the inclination of the movable body 5 with respect to the Y direction when the movable body 5 is driven in the Y direction.

  As described above, in the present embodiment, even if the movable body 5 is movable in the direction orthogonal to the optical axis direction in order to correct the shake, the movable body 5 can move relative to the optical axis direction, the first direction, and the second direction. Unnecessary tilt can be eliminated, and as a result, it is possible to improve the quality of an image shot by a camera on which the lens driving device 1 is mounted.

  In this embodiment, on the subject side of the movable body 5, the spring force action points SP <b> 1 to SP <b> 4 are arranged with a rotational symmetry of 90 ° with respect to the optical axis L, and the spring force action point on the opposite subject side of the movable body 5. The points SP5 to SP8 are arranged with a rotational symmetry of 90 ° with the optical axis L as the center. Further, the acting forces of the leaf springs 8 in the optical axis direction at the spring force acting points SP1 to SP8 are substantially equal. Therefore, the first restoring force gravity center SZ coincides with the optical axis L when viewed from the optical axis direction as described above. Further, in this embodiment, the first driving force action points DP1 to DP4 are arranged in a rotational symmetry of 90 ° with the optical axis L as the center, and the driving force acting on each first driving force action point DP1 to DP4 is It is almost equal. Therefore, the first driving force center of gravity DZ coincides with the optical axis L when viewed from the optical axis direction as described above. Therefore, in this embodiment, it is easy to make the first restoring force gravity center SZ and the first driving force gravity center DZ substantially coincide when viewed from the optical axis direction.

  In the present embodiment, the spring force action point SP1 and the spring force action point SP7 are arranged substantially point-symmetrically with respect to the intersection point CP, the spring force action point SP2 and the spring force action point SP8 are arranged substantially point-symmetrically, The spring force action point SP3 and the spring force action point SP5 are arranged substantially point-symmetrically, and the spring force action point SP4 and the spring force action point SP6 are arranged substantially point-symmetrically. Further, the acting force of the leaf spring 8 in the X direction at the spring force acting points SP1 to SP8 is equal, and the acting force of the leaf spring 8 in the Y direction at the spring force acting points SP1 to SP8 is equal. Therefore, as described above, the second restoring force centroid SX coincides with the intersection CP when viewed from the X direction, and the third restoring force centroid SY coincides with the intersection CP when viewed from the Y direction.

  Further, in this embodiment, when viewed from the X direction, the second driving force application point DP5 and the second driving force application point DP6 are arranged substantially symmetrically with respect to the intersection point CP, and when viewed from the Y direction. The third driving force action point DP7 and the third driving force action point DP8 are arranged substantially point-symmetrically with respect to the intersection point CP, and the driving forces acting on the second driving force action points DP5 and DP6 are substantially equal. The driving forces acting on the third driving force action points DP7 and DP8 are substantially equal. Therefore, as described above, the second driving force center of gravity DX substantially coincides with the intersection point CP when viewed from the X direction, and the third driving force center of gravity DY substantially coincides with the intersection point CP when viewed from the Y direction. .

  Therefore, in this embodiment, it is easy to make the second restoring force gravity center SX and the second driving force gravity center DX substantially coincide when viewed from the X direction, and the third restoring force when viewed from the Y direction. It becomes easy to make the center of gravity SY substantially coincide with the second driving force center of gravity DY.

  In this embodiment, the center of gravity G of the movable body 5 is inside a rectangular parallelepiped or a cube formed by the spring force action points SP1 to SP8. Therefore, when the movable body 5 is moved, the movable body 5 is difficult to tilt with respect to the optical axis direction, the X direction, and the Y direction. In addition, the movable body 5 is less likely to be inclined in the optical axis direction, the X direction, and the Y direction due to the attitude difference of the lens driving device 1.

  In this embodiment, as described above, even when the movable body 5 moves in the optical axis direction, the X direction, and the Y direction, the volume of the driving coil 16 disposed between the driving magnets 15 disposed to face each other, and The volume of the short side portion 17c of the two drive coils 17 does not change. A magnetic field region having a uniform magnetic flux density is formed between the drive magnets 15 facing each other. Therefore, in this embodiment, even when the movable body 5 is moving in a direction substantially orthogonal to the optical axis direction, the optical axis of the driving force in the optical axis direction at the first driving force action points DP1 to DP4. The balance with respect to L is less likely to be lost. Therefore, the tilt of the movable body 5 with respect to the optical axis direction when the movable body 5 is driven in the optical axis direction can be effectively suppressed. Further, even when the movable body 5 moves in the optical axis direction or the Y direction, the balance of the driving force in the X direction at the second driving force action points DP5 and DP6 with respect to the intersection point CP is not easily lost. Therefore, the tilt of the movable body 5 with respect to the X direction when the movable body 5 is driven in the X direction can be effectively suppressed. Furthermore, even when the movable body 5 moves in the optical axis direction or the X direction, the balance of the driving force in the Y direction of the movable body 5 at the third driving force action points DP7 and DP8 with respect to the intersection point CP is balanced. It becomes difficult to collapse. Accordingly, it is possible to effectively suppress the inclination of the movable body 5 with respect to the Y direction when the movable body 5 is driven in the Y direction.

  In this embodiment, even if the movable body 5 moves in the optical axis direction, the X direction, and the Y direction, the volume of the driving coil 16 and the two driving coils arranged between the driving magnets 15 arranged to face each other. The volume of the short side portion 17c of the coil 17 is not changed, and a magnetic field region having a uniform magnetic flux density is formed between the driving magnets 15 facing each other. Therefore, even when the movable body 5 is moving in the optical axis direction or a direction substantially orthogonal to the optical axis direction, the driving force of the movable body 5 in the optical axis direction, the X direction, and the Y direction is unlikely to fluctuate. Become. Therefore, the movable body 5 can be moved in a stable state in the optical axis direction and the direction orthogonal to the optical axis direction.

  In the present embodiment, the distance R1 between the spring force application points SP1 to SP4 and the plane P in the optical axis direction and the leaf spring 8 in the X direction at the spring force application points SP1 to SP4 when the movable body 5 moves in the X direction. The plate in the X direction at the spring force action points SP5 to SP8 when the movable body 5 moves in the X direction with the product of the action force and the distance R2 between the spring force action points SP5 to SP8 and the plane P in the optical axis direction. The product of the acting force of the spring 8 is substantially equal. Therefore, the tilt of the movable body 5 with respect to the X direction when the movable body 5 is driven in the X direction can be effectively suppressed.

  In the present embodiment, the distance R1 between the spring force action points SP1 to SP4 and the plane P in the optical axis direction and the leaf spring 8 in the Y direction at the spring force action points SP1 to SP4 when the movable body 5 moves in the Y direction. Y-direction plate at the spring force action points SP5 to SP8 when the movable body 5 moves in the optical direction between the product of the action force and the distance R2 between the spring force action points SP5 to SP8 and the plane P in the optical axis direction. The product of the acting force of the spring 8 is substantially equal. Therefore, the tilt of the movable body 5 with respect to the Y direction when the movable body 5 is driven in the Y direction can be effectively suppressed.

  In this embodiment, the two adjacent short side portions 17c are arranged between the drive magnets 15 arranged opposite to each other, and the current in the same direction flows through the adjacent short side portions 17c. A coil 17 is wound. Therefore, it is possible to increase the driving force of the movable body 5 in the X direction and the Y direction by using the two short sides 17c.

  In this embodiment, the movable body fixing portion 8a of the leaf spring 8 is fixed to the movable body 5 so that the longitudinal direction of the long arm portions 8d and 8e of the leaf spring 8 is substantially parallel to the X direction or the Y direction. . Therefore, the movable body 5 can be appropriately moved in the optical axis direction, and the movable body 5 can be appropriately moved in the X direction and the Y direction.

  In this embodiment, the spring constant of the leaf spring 8 in the optical axis direction is smaller than the spring constant of the leaf spring 8 in a direction substantially orthogonal to the optical axis direction. Therefore, even if the movable body 5 is movable in a direction substantially orthogonal to the optical axis direction, the movable body 5 can be stabilized in the direction substantially orthogonal to the optical axis direction. Therefore, it is possible to suppress a decrease in the quality of an image taken by a camera in which the lens driving device 1 is mounted.

  In this embodiment, each of both ends of the conducting wire forming the driving coil 16, each of both ends of the conducting wire forming the four driving coils 17 attached to the outside of the plane portion 9 a parallel to the X direction, and Each of the both end sides of the conducting wire forming the four driving coils 17 attached to the outside of the plane portion 9 a parallel to the Y direction is individually fixed to the leaf spring 8. Therefore, it is not necessary to separately provide a conductor for forming the driving coil 16 and a member for fixing the end of the conductor forming the driving coil 17, and the configuration of the lens driving device 1 can be simplified. Become.

  Alternatively, in this embodiment, on one end side of the conducting wire of the driving coil 16, on one end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9 a parallel to the X direction and on the outside of the plane portion 9 a parallel to the Y direction. One end side of the conducting wire of the driving coil 17 to be attached is individually fixed to the leaf spring 8 arranged on the side opposite to the subject, and the other end side of the conducting wire of the driving coil 16 is parallel to the X direction. The other end side of the conducting wire of the driving coil 17 attached to the outer side and the other end side of the conducting wire of the driving coil 17 attached to the outside of the plane portion 9a parallel to the Y direction are the remaining leaf springs arranged on the anti-subject side. 8 is fixed. Therefore, it is not necessary to separately provide a member for fixing the conductive wire of the driving coil 16 and the end of the conductive wire of the driving coil 17, and the configuration of the lens driving device 1 can be simplified. Further, in this case, the leaf spring 8 disposed on the side opposite to the subject can be used to process the end of the lead wire of the drive coil 16 and the lead wire of the drive coil 17, so that the drive coil 16 and the driving coil 17 can be easily routed.

  In the present embodiment, the eight drive magnets 15 that are the first drive magnets are the same as the second drive magnets (that is, the four drive magnets 15 arranged opposite to each other in the Y direction), The three driving magnets are common (that is, the four driving magnets 15 arranged opposite to each other in the X direction). Therefore, it is not necessary to separately provide the first driving magnet in addition to the second driving magnet and the third driving magnet. Therefore, the configuration of the lens driving device 1 can be simplified.

[Embodiment 2]
FIG. 11 is a plan view for explaining a schematic configuration of the lens driving device 31 according to the second embodiment of the present invention. FIG. 12 is a diagram for explaining a schematic configuration of a part of the driving mechanism 37 of the lens driving device 31 shown in FIG. FIG. 13 is a plan view for explaining the position of the acting point of the driving force of the driving mechanism 37 and the position of the acting point of the spring force of the leaf spring 8 in the lens driving device 31 shown in FIG.

  The lens driving device 31 of this embodiment is configured in substantially the same manner as the lens driving mechanism 1 except that the driving mechanism 37 for driving the movable body 5 is different from the driving mechanism 7 of the lens driving device 1 of the first embodiment. Has been. Therefore, hereinafter, the lens driving device 31 of the present embodiment will be described focusing on this difference.

  Similar to the lens driving device 1, the lens driving device 31 includes a movable body 5, a fixed body 6, and a drive mechanism 37 for driving the movable body 5. The movable body 5 is movably held on the fixed body 6 via a leaf spring 8. As with the first embodiment, four leaf springs 8 are arranged on each of both end sides of the movable body 5 in the optical axis direction.

  The movable body 5 includes a sleeve 39 formed in the same manner as the sleeve 9 of the first embodiment. That is, the sleeve 39 is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape, and the outer shape of the sleeve 39 when viewed from the optical axis direction is a substantially rectangular shape centered on the optical axis L. Further, the outer peripheral surface of the sleeve 39 is constituted by four plane portions 39a substantially parallel to the X direction or the Y direction. The sleeve 39 is formed with a through hole 39b in which the driving magnet 15 is disposed at a position corresponding to the concave portion 9b of the sleeve 9, and the sleeve 39 is different from the sleeve 9 in this respect.

  Similar to the drive mechanism 7 of the first embodiment, the drive mechanism 37 includes eight drive magnets 15 and eight drive coils 17 wound in a substantially rectangular air-core shape. Further, as shown in FIGS. 11 and 12, the drive mechanism 37 is wound in a substantially cylindrical shape with four substantially columnar drive magnets 45 disposed at positions corresponding to the four corners of the lens drive device 31. And four driving coils 46 that are arranged on the inner peripheral side of the driving magnet 45 so as to face each other with a predetermined gap.

  As in the first embodiment, four of the eight drive magnets 15 are arranged in the through hole 39b of the sleeve 39 as shown in FIG. The remaining four drive magnets 15 are arranged so as to face the drive magnets 15 arranged in the through holes 39b with a predetermined gap. The driving coil 17 is fixed to the flat portion 39 a of the sleeve 39. Specifically, almost in the same manner as in the first embodiment, the short side portions 17c and 17d are substantially parallel to the optical axis direction, and the two drive coils 17 are adjacent in the X direction or the Y direction. As described above, the driving coil 17 is fixed to the flat portion 39a.

  The drive magnet 45 is formed in, for example, a substantially polygonal column shape such as a substantially triangular prism or a substantially cylindrical shape. As shown in FIG. 12, the driving magnet 45 is disposed between two substantially columnar driving magnet pieces 47 and 48 arranged so as to overlap in the optical axis direction, and the driving magnet pieces 47 and 48. And a flat magnetic member 49. The drive coil 46 is formed, for example, by being wound into a substantially polygonal tube shape such as a substantially triangular tube or a substantially cylindrical shape. The four drive coils 46 are fixed to the four corners of the sleeve 39. Specifically, as described above, the four driving coils 46 are fixed to the four corners of the sleeve 39 so that the inner peripheral side thereof is disposed opposite to the outer peripheral surface of the driving magnet 45 via a predetermined gap. Has been. In this embodiment, the drive magnet 45 and the drive coil 46 are formed so that the magnetic member 49 is disposed on the inner peripheral side of the drive coil 46 in the entire movable range of the movable body 5 in the optical axis direction. Has been.

  As shown in FIG. 12, the drive magnet pieces 47 and 48 are arranged so that the same magnetic poles (S pole and S pole, or N pole and N pole) face each other in the optical axis direction. That is, the opposing surfaces of the drive magnet pieces 47 and 48 are both magnetized to the same magnetic pole. Therefore, as shown in FIG. 12, a magnetic flux passing through the driving coil 46 is generated between the driving magnet pieces 47 and 48 inward or outward in the radial direction. That is, the drive magnet 45 is magnetized so that a magnetic flux passing through the drive coil 46 is generated at a position facing the drive coil 46.

  Therefore, when a current is supplied to the driving coil 46, a driving force in the optical axis direction is generated in the movable body 5 by the action of the driving magnet 45 and the driving coil 46 that are arranged to face each other. That is, in this embodiment, the first drive mechanism for driving the movable body 5 in the optical axis direction is configured by the four drive magnets 45 and the four drive coils 46. As in the first embodiment, also in this embodiment, the four drive coils 17 attached to the flat portion 39a parallel to the X direction and the four drive magnets 15 arranged to face each other in the Y direction, A second drive mechanism for driving the movable body 5 in the X direction is configured, and the four drive coils 17 mounted on the flat portion 39a parallel to the Y direction are arranged to face each other in the X direction. The magnet 15 forms a third drive mechanism for driving the movable body 5 in the Y direction.

  Further, the four drive coils 46 are formed by sequentially winding one conductive wire, and each of both end sides of the conductive wire forming the drive coil 46 is for driving according to the first embodiment. It is fixed to the leaf spring 8 by soldering or the like in substantially the same manner as the conductive wire of the coil 16. In this embodiment, the drive coil 46 is a first drive coil, and the drive magnet 45 is a first drive magnet.

  Similar to the first embodiment, the movable body 5 has eight spring force action points SP1 to SP8. Similarly to the first embodiment, when viewed from the optical axis direction, a square T1 is formed by the spring force action points SP1 to SP4 as shown in FIG. 13, and a square T2 is formed by the spring force action points SP5 to SP8. Has been. Similarly to the first embodiment, the first restoring force gravity center SZ substantially coincides with the optical axis L when viewed from the optical axis direction.

  As described above, when a current is supplied to the driving coil 46, a driving force in the optical axis direction is generated in the driving coil 46 by the action of the driving magnet 45 and the driving coil 46. That is, the movable body 5 to which the driving coil 46 is fixed has four first driving force application points DP11 to DP14 where the driving force in the optical axis direction acts as shown in FIG. Further, the driving coil 46 is fixed to the four corners of the sleeve 39, and when viewed from the optical axis direction, as shown in FIG. 13, the first driving force action point DP11 and the first driving force with respect to the optical axis L. The action point DP13 is arranged approximately point-symmetrically, and the first driving force action point DP12 and the first driving force action point DP14 are arranged substantially point-symmetrically. Further, in the present embodiment, the first driving force action points DP11 to DP14 are arranged with a rotational symmetry of 90 ° with the optical axis L as the center.

  In the present embodiment, the driving forces acting on the first driving force action points DP11 to DP14 are substantially equal. Therefore, the first driving force center of gravity DZ, which is the center of gravity of the driving force in the optical axis direction by the driving mechanism 37, substantially matches the optical axis L when viewed from the optical axis direction. That is, in this embodiment, when viewed from the optical axis direction, the first driving force gravity center DZ and the first restoring force gravity center SZ substantially coincide. Further, when viewed from the optical axis direction, the first driving force gravity center DZ is arranged in the quadrangles T1 and T2.

  In this embodiment as well, as in the first embodiment, the second driving force gravity center DX and the second restoring force gravity center SX substantially coincide with each other when viewed from the X direction. Further, when viewed from the X direction, the second driving force gravity center DX is disposed in the quadrangle T3. Also in this embodiment, the third driving force centroid DY and the third restoring force centroid SY substantially match when viewed from the Y direction. Further, when viewed from the Y direction, the third driving force gravity center DY is disposed in the quadrangle T4.

  In the lens driving device 31 of the present embodiment configured as described above, substantially the same effect as that of the first embodiment can be obtained. In this embodiment, the driving magnets 45 disposed at the four corners of the lens driving device 31 are magnetized so that magnetic flux passing through the driving coil 46 is generated at positions facing the driving coil 46. Even when the movable body 5 moves in a direction substantially orthogonal to the optical axis direction, the balance of the driving force in the optical axis direction around the optical axis L is not easily lost. As a result, in this embodiment, the tilt of the movable body 5 with respect to the optical axis direction when the movable body 5 is driven in the optical axis direction can be effectively suppressed.

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

  In the embodiment described above, the movable body 5 has eight spring force action points SP1 to SP8. In addition, for example, if there are three or more spring force action points on the movable body 5, the number of spring force action points on the movable body 5 may be seven or less. Further, the movable body 5 may have nine or more spring force action points.

  In the embodiment described above, the spring force action points SP1 to SP8 form the squares T1 and T2 when viewed from the optical axis direction, but the spring force action points form a triangle when viewed from the optical axis direction. Alternatively, a pentagon or more polygon may be formed. Similarly, in the embodiment described above, the spring force action points SP1 to SP8 form a quadrangle T3 when viewed from the X direction, but the spring force action points form a triangle when viewed from the X direction. Alternatively, a pentagon or more polygon may be formed. Further, in the above-described form, the quadrangle T4 is formed by the spring force action points SP1 to SP8 when viewed from the Y direction, but a triangle is formed by the spring force action point when viewed from the Y direction. Alternatively, a pentagon or more polygon may be formed.

  In the embodiment described above, the first restoring force gravity center SZ substantially coincides with the optical axis L when viewed from the optical axis direction, but the first restoring force gravity center SZ is the optical axis when viewed from the optical axis direction. It may deviate from L. In the above-described embodiment, the first driving force gravity center DZ substantially coincides with the optical axis L when viewed from the optical axis direction, but the first driving force gravity center DZ is viewed from the optical axis direction. It may deviate from the optical axis L. Further, in the above-described form, the first driving force gravity center DZ and the first restoring force gravity center SZ substantially coincide with each other when viewed from the optical axis direction, but the first driving force gravity center DZ is viewed from the optical axis direction. May deviate from the first restoring force gravity center SZ.

  In the embodiment described above, the second restoring force centroid SX substantially coincides with the intersection CP when viewed from the X direction, but the second restoring force centroid SX deviates from the intersection CP when viewed from the X direction. May be. In the above-described form, the second driving force center of gravity DX substantially coincides with the intersection point CP when viewed from the X direction. However, the second driving force center of gravity DX is from the intersection point CP when viewed from the X direction. It may be shifted. Further, in this embodiment, when viewed from the X direction, the second driving force center of gravity DX and the second restoring force center of gravity SX substantially coincide with each other, but the second driving force center of gravity DX is viewed from the X direction. The second restoring force center of gravity SX may be deviated.

  In the above-described form, the third restoring force center of gravity SY substantially coincides with the intersection point CP when viewed from the Y direction, but the third restoring force center of gravity SY deviates from the intersection point CP when viewed from the Y direction. May be. Further, in the above-described form, the third driving force gravity center DY substantially coincides with the intersection point CP when viewed from the Y direction, but the third driving force gravity center DY may be deviated from the intersection point CP. Furthermore, in the above-described form, the third driving force gravity center DY and the third restoring force gravity center SY substantially coincide with each other when viewed from the Y direction, but the third driving force gravity center DY is viewed from the optical axis direction. May deviate from the third restoring force center of gravity SY.

  In the embodiment described above, when viewed from the optical axis direction, the spring force action points SP1 to SP4 and the spring force action points SP5 to SP8 are arranged with a rotational symmetry of 90 ° about the optical axis L. In addition to this, for example, the spring force action points SP1 to SP4 and / or the spring force action points SP5 to SP8 are not arranged with rotational symmetry of 90 ° about the optical axis L when viewed from the optical axis direction. May be. Further, when viewed from the optical axis direction, the spring force action point SP1 and the spring force action point SP3 do not have to be arranged substantially point-symmetrically with respect to the optical axis L, or the spring force action point SP2 and the spring force. The action point SP4 may not be arranged substantially point-symmetrically with respect to the optical axis L. Similarly, when viewed from the optical axis direction, the spring force action point SP5 and the spring force action point SP7 do not have to be arranged substantially point-symmetrically with respect to the optical axis L, or the spring force action point SP6 and the spring The force application point SP8 may not be arranged substantially point-symmetrically with respect to the optical axis L.

  Further, in the embodiment described above, when viewed from the X direction, the spring force action point SP1 and the spring force action point SP7 are arranged substantially symmetrically with respect to the intersection point CP, and the spring force action point SP2 and the spring force action are arranged. The point SP8 is arranged approximately point-symmetrically, the spring force acting point SP3 and the spring force acting point SP5 are arranged substantially point-symmetrically, and the spring force acting point SP4 and spring force acting point SP6 are arranged substantially point-symmetrically. However, when viewed from the X direction, the spring force application point SP1 and the spring force application point SP7 do not have to be substantially point-symmetric with respect to the intersection point CP, or the spring force application point SP2 and the spring The force application point SP8 may not be arranged substantially point-symmetrically. Further, when viewed from the X direction, the spring force action point SP3 and the spring force action point SP5 do not have to be arranged substantially point-symmetrically with respect to the intersection point CP, or the spring force action point SP4 and the spring force action point. The point SP6 may not be arranged substantially point-symmetrically.

  Further, in the embodiment described above, when viewed from the Y direction, the spring force action point SP1 and the spring force action point SP7 are arranged substantially point-symmetrically with respect to the intersection point CP, and the spring force action point SP2 and the spring force action are arranged. The point SP8 is arranged approximately point-symmetrically, the spring force acting point SP3 and the spring force acting point SP5 are arranged substantially point-symmetrically, and the spring force acting point SP4 and spring force acting point SP6 are arranged substantially point-symmetrically. However, when viewed from the Y direction, the spring force application point SP1 and the spring force application point SP7 do not have to be substantially point-symmetric with respect to the intersection point CP, or the spring force application point SP2 and the spring The force application point SP8 may not be arranged substantially point-symmetrically. Further, when viewed from the Y direction, the spring force action point SP3 and the spring force action point SP5 do not have to be arranged substantially symmetrically, and the spring force action point SP4 and the spring force action point SP6 are substantially points. It does not have to be arranged symmetrically.

  In the form mentioned above, there are the first driving force action points DP1 to DP4 and DP11 to DP14 at four locations of the movable body 5. In addition to this, for example, the number of first driving force action points existing in the movable body 5 may be three or less, or may be five or more. In the above-described embodiment, the second driving force action points DP5 and DP6 are provided at two places on the movable body 5. However, the number of second driving force action points existing on the movable body 5 may be one. And it may be three or more places. Furthermore, in the form mentioned above, there are the third driving force action points DP7 and DP8 at two places on the movable body 5, but the number of the third driving force action points existing on the movable body 5 may be one. And it may be three or more places.

  In the embodiment described above, the first driving force action points DP1 to DP4 and the first driving force action points DP11 to DP14 are arranged with a rotational symmetry of 90 ° with respect to the optical axis L. In addition to this, for example, the first driving force action points DP1 to DP4 and / or the first driving force action points DP11 to DP14 may not be arranged with a rotational symmetry of 90 ° with the optical axis L as the center. Further, when viewed from the optical axis direction, the first driving force action point DP1 and the first driving force action point DP3 do not have to be arranged substantially point-symmetrically with respect to the optical axis L. The force action point DP2 and the first driving force action point DP4 need not be arranged substantially symmetrically. Similarly, when viewed from the optical axis direction, the first driving force action point DP11 and the first driving force action point DP13 do not have to be arranged substantially point-symmetrically with respect to the optical axis L. The driving force action point DP12 and the first driving force action point DP14 do not have to be arranged substantially symmetrically.

  Further, in the above-described form, when viewed from the X direction, the second driving force action point DP5 and the second driving force action point DP6 are arranged substantially point-symmetrically with respect to the intersection point CP. When viewed, the second driving force action point DP5 and the second driving force action point DP6 do not have to be substantially point-symmetric with respect to the intersection point CP. Further, in the above-described form, when viewed from the Y direction, the third driving force action point DP7 and the second driving force action point DP8 are arranged substantially point-symmetrically with respect to the intersection point CP. When viewed, the third driving force action point DP7 and the second driving force action point DP8 do not have to be substantially point-symmetric with respect to the intersection point CP.

  In the embodiment described above, the acting force of the leaf spring 8 at each spring force acting point SP1 to SP8 is substantially equal, but the acting force of the leaf spring 8 at each spring force acting point SP1 to SP8 may not be equal.

  In the first embodiment described above, the driving forces acting on the first driving force action points DP1 to DP4 are substantially equal, but the driving forces acting on the first driving force action points DP1 to DP4 are not equal. Also good. In the second embodiment described above, the driving forces acting on the first driving force action points DP11 to DP14 are substantially equal, but the driving forces acting on the first driving force action points DP11 to DP14 are equal. It is not necessary. Furthermore, in the embodiment described above, the driving forces acting on the second driving force action points DP5 and DP6 are substantially equal, but the driving forces acting on the second driving force action points DP5 and DP6 are not substantially equal. Also good. Furthermore, in the embodiment described above, the driving forces acting on the third driving force action points DP7 and DP8 are substantially equal, but the driving forces acting on the third driving force action points DP7 and DP8 are not equal. Also good.

  In the embodiment described above, the two drive magnets 15 are arranged opposite to each other at four locations on the outer peripheral side of the sleeves 9 and 39. In addition to this, for example, if a magnetic field region having a uniform magnetic flux density can be formed, the driving magnet 15 and the magnetic piece may be arranged to face each other at four locations on the outer peripheral side of the sleeves 9 and 39. good. In this case, for example, the magnetic piece is formed in substantially the same shape as the drive magnet 15. In the embodiment described above, the driving magnet 15 is disposed in the recess 9b and the through hole 39b of the sleeves 9 and 39. However, even if the driving magnet 15 is not disposed in the recess 9b and the through hole 39b. good.

  In the embodiment described above, the two drive coils 17 are arranged on each of the four flat portions 9a, 39a of the sleeves 9, 39. In addition, for example, one driving coil 17 may be fixed to each of the four flat portions 9a and 39a. When one driving coil 17 is fixed to each of the four flat portions 39a, for example, the opposing surface 15a of the driving magnet 15 is adjacent to different magnetic poles in the X direction or the Y direction. Thus, the driving coil 17 is arranged so that each of the short side portions 17c and 17d faces each of the different magnetic poles formed on the facing surface 15a.

  In the embodiment described above, the distance R1 and the distance R2 are substantially equal. Further, the acting force of the leaf spring 8 in the X direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction and the spring force acting point SP5 when the movable body 5 moves in the X direction. The acting force of the leaf spring 8 in the X direction at SP8 is substantially equal, and the acting force of the leaf spring 8 in the Y direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction, and the Y direction. The acting force of the leaf spring 8 in the Y direction at the spring force acting points SP5 to SP8 when the movable body 5 is moved to is substantially equal. In addition to this, for example, the product of the acting force of the leaf spring 8 in the X direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction, and the movable body 5 in the X direction. If the product of the acting force of the leaf spring 8 in the X direction at the spring force acting points SP5 to SP8 when moved and the distance R2 are substantially equal, the distance R1 and the distance R2 may not be equal. Then, the acting force of the leaf spring 8 in the X direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction, and the spring force acting point SP5 when the movable body 5 moves in the X direction. The acting force of the leaf spring 8 in the X direction at SP8 may not be equal. Similarly, when the movable body 5 moves in the Y direction by the product of the acting force of the leaf spring 8 in the Y direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction. If the product of the acting force of the leaf spring 8 in the Y direction and the distance R2 at the spring force acting points SP5 to SP8 is substantially equal, the distance R1 may not be equal to the distance R2. At the acting force of the leaf spring 8 in the Y direction at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction, and at the spring force acting points SP5 to SP8 when the movable body 5 moves in the Y direction. The acting force of the leaf spring 8 in the Y direction may not be equal.

  When the movable body 5 moves in the X direction, the product of the acting force of the leaf spring 8 in the X direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the X direction and the movable body 5 moves in the X direction. The product of the acting force of the leaf spring 8 in the X direction and the distance R2 at the spring force acting points SP5 to SP8 does not necessarily have to be substantially equal. Similarly, when the movable body 5 moves in the Y direction by the product of the acting force of the leaf spring 8 in the Y direction and the distance R1 at the spring force acting points SP1 to SP4 when the movable body 5 moves in the Y direction. The product of the acting force of the leaf spring 8 in the Y direction at the spring force acting points SP5 to SP8 and the distance R2 does not necessarily have to be substantially equal.

  In the embodiment described above, four leaf springs 8 are arranged on each of the subject side and the non-subject side of the movable body 5. In addition, for example, one leaf spring formed by connecting four fixed body fixing portions 8b may be disposed on the subject side and / or the non-subject side of the movable body 5.

  In the embodiment described above, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is a substantially square shape. In addition, for example, the lens driving device 1 may be formed such that the shape when viewed from the optical axis direction is a substantially polygonal shape other than the substantially rectangular shape, or the shape when viewed from the optical axis direction. May be formed into a substantially circular shape or a substantially elliptical shape.

  In the second embodiment described above, the magnetic member 49 is disposed between the driving magnet pieces 47 and 48. However, even if a predetermined gap is formed between the opposing surfaces of the driving magnet pieces 47 and 48. Alternatively, the opposing surfaces of the drive magnet pieces 47 and 48 may be in contact with each other. In the above-described embodiment, the driving magnet 45 is constituted by the two driving magnet pieces 47 and 48 and the magnetic member 49. However, the driving magnet 45 is constituted by only one driving magnet piece. It may be configured.

  In the embodiment described above, the lens driving device 1 is used in a camera mounted on a mobile device such as a mobile phone. In addition to this, for example, the lens driving device 1 may be used in a camera mounted on a drive recorder that records the driving situation of an automobile. In this case, when camera shake is detected by a sensor such as a gyroscope due to the vibration of the automobile during travel, current is supplied to the drive coil 17 based on the detection result of the sensor. Then, the movable body 5 moves in the X direction and / or the Y direction, and the shake is corrected. The lens driving device 1 may be mounted on other cameras such as a monitoring camera.

  In the above-described embodiment, a reflection mirror that bends the optical axis L by approximately 90 ° may be disposed on the subject side of the lens driving devices 1 and 31.

DESCRIPTION OF SYMBOLS 1, 31 Lens drive device 2-4 Lens 5 Movable body 6 Fixed body 8 Leaf spring (spring member)
8a Movable body fixing part 8b Fixed body fixing part 8c Arm part 8d, 8e Long arm part (first arm part, second arm part)
15 Driving magnet (first driving magnet, second driving magnet, third driving magnet, part of first driving mechanism, part of second driving mechanism, part of third driving mechanism)
15a facing surface (second facing surface, third facing surface)
16 Driving coil (first driving coil, part of the first driving mechanism)
17 Driving coil (second driving coil, third driving coil, part of second driving mechanism, part of third driving mechanism)
17a, 17b long side (second straight side, third straight side)
17c short side portion (second effective coil portion, third effective coil portion, second straight side portion, third straight side portion, second effective side portion, third effective side portion, second adjacent side portion, third adjacent side Side)
17d short side (second straight side, third straight side)
45 Driving magnet (first driving magnet, part of first driving mechanism)
46 Driving coil (first driving coil, part of the first driving mechanism)
CP intersection (first reference point, second reference point, third reference point, fourth reference point)
DP1 to DP4, DP11 to DP14 First driving force action point DP5, DP6 Second driving force action point DP7, DP8 Third driving force action point DX Second driving force center of gravity DY Third driving force center of gravity DZ First driving force center of gravity G Center of gravity L Optical axis P Plane (first plane, second plane)
SP1 to SP8 Spring force action point SX Second restoring force centroid SY Third restoring force centroid SZ First restoring force centroid T1, T2 Quadrangle (n0 square)
T3 square (n1 square)
T4 square (n2 square)
X 1st direction Y 2nd direction Z Optical axis direction

Claims (17)

One movable body that holds the lens and is movable in an optical axis direction of the lens and a direction substantially orthogonal to the optical axis direction, and the movable body in the optical axis direction and a direction substantially orthogonal to the optical axis direction A fixed body that holds the movable body so as to be movable, a first drive mechanism for driving the movable body in the optical axis direction, and in a predetermined first direction substantially orthogonal to the optical axis direction. A second drive mechanism for driving the movable body, and a third drive mechanism for driving the movable body in a second direction substantially orthogonal to the optical axis direction and the first direction;
A spring member having a movable body fixing portion fixed to the movable body and a fixed body fixing portion fixed to the fixed body;
The spring member is disposed on each of one end side and the other end side of the movable body in the optical axis direction,
Each of one end and the other end of the movable body in the optical axis direction, there is the spring force acting point of 4箇plants spring force of the spring member and the movable body fixing part is fixed acts,
When viewed from the optical axis direction, the first driving force centroid serving as the centroid of the driving force by the first driving mechanism is more than the eight spring force action points when viewed from the optical axis direction. It is arranged on the center side of the movable body,
When viewed from the first direction, the second driving force center of gravity serving as the center of gravity of the driving force by the second driving mechanism is more than the eight spring force action points when viewed from the first direction. It is arranged on the center side of the movable body,
When viewed from the second direction, the third driving force centroid serving as the centroid of the driving force by the third driving mechanism is more than the eight spring force action points when viewed from the second direction. It is arranged on the center side of the movable body,
The first drive mechanism includes first drive magnets arranged opposite to each other or first drive magnets and first magnetic pieces arranged opposite to each other, and a first drive coil,
There is a first magnetic field region having a uniform magnetic flux density between the first driving magnets arranged opposite to each other or between the first driving magnets arranged opposite to each other and the first magnetic piece. Formed,
The first driving coil is disposed between the first driving magnets arranged to face each other, or between the first driving magnet and the first magnetic pieces arranged to face each other, and faces each other. A direction substantially perpendicular to the direction of the magnetic flux generated between the first driving magnets arranged or between the first driving magnets arranged opposite to each other and the first magnetic piece, and the optical axis direction. A first effective coil portion through which a current flows,
The second drive mechanism includes a second drive magnet disposed opposite to each other or a second drive magnet and a second magnetic piece disposed opposite to each other, and a second drive coil.
There is a second magnetic field region having a uniform magnetic flux density between the second driving magnets arranged opposite to each other or between the second driving magnets arranged opposite to each other and the second magnetic piece. Formed,
The second drive coil is disposed between the second drive magnets arranged to face each other, or between the second drive magnet and the second magnetic pieces arranged to face each other, and faces each other. Between the second driving magnets arranged or between the second driving magnets arranged opposite to each other and the second magnetic piece, it is substantially orthogonal to the direction of the magnetic flux and substantially in the optical axis direction. A second effective coil portion in which current flows in a parallel direction;
The third drive mechanism includes third drive magnets arranged opposite to each other or third drive magnets and third magnetic pieces arranged opposite to each other, and a third drive coil.
There is a third magnetic field region having a uniform magnetic flux density between the third driving magnets arranged to face each other or between the third driving magnets arranged to face each other and the third magnetic piece. Formed,
The third driving coil is arranged between the third driving magnets arranged opposite to each other, or between the third driving magnet arranged opposite to each other and the third magnetic piece, and opposed to each other. Between the third drive magnets arranged or between the third drive magnets arranged opposite to each other and the third magnetic piece, it is substantially orthogonal to the direction of the magnetic flux and substantially in the optical axis direction. A third effective coil portion in which current flows in a parallel direction;
The volume of the first effective coil portion disposed in the first magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction, and / or Alternatively, the volume of the second effective coil portion disposed in the second magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction, And / or the volume of the third effective coil portion disposed in the third magnetic field region is substantially constant within the movable range of the movable body in the optical axis direction, the first direction, and the second direction. And
The first driving magnets arranged opposite to each other, the first driving magnets arranged opposite to each other and the first magnetic pieces, and the second driving magnets arranged opposite to each other or the first arranged opposite to each other. The second driving magnet and the second magnetic piece, and the third driving magnet and the third driving magnet and the third magnetic piece, which are arranged to face each other, are attached to the fixed body. ,
The first drive coil, the second drive coil, and the third drive coil are attached to the movable body,
The first driving magnets arranged to face each other are constituted by the same ones as the second driving magnets arranged to face each other, and the same ones as the third driving magnets arranged to face each other. Or the first driving magnet and the first magnetic piece that are arranged to face each other are arranged to face each other in common with the second driving magnet and the second magnetic piece that are arranged to face each other. A lens driving device comprising the third driving magnet and the third magnetic piece in common . The first restoring force centroid, which is the centroid of the restoring force of the movable body in the optical axis direction by the spring member when the movable body is moved in the optical axis direction, is viewed from the optical axis direction. Substantially coincides with the first driving force center of gravity, and / or
When the movable body moves in the first direction, the second restoring force centroid, which is the centroid of the restoring force of the movable body in the first direction by the spring member, is viewed from the first direction. Substantially coincide with the second driving force center of gravity, and / or
A third restoring force center of gravity, which is a center of gravity of the restoring force of the movable body in the second direction by the spring member when the movable body moves in the second direction, is the above when viewed from the second direction. The lens driving device according to claim 1, wherein the lens driving device substantially coincides with the third driving force center of gravity. When viewed from the optical axis direction, there are two or more pairs of the spring force action points arranged approximately point-symmetrically with respect to a predetermined 0th reference point, and approximately points with respect to the 0th reference point. The acting force of the spring member in the optical axis direction at the pair of symmetrically arranged spring force acting points is substantially equal, and / or
When viewed from the first direction, there are two or more pairs of the spring force action points arranged approximately point-symmetrically with respect to a predetermined first reference point, and substantially points with respect to the first reference point. The acting force of the spring member in the first direction at the pair of symmetrically arranged spring force acting points is substantially equal, and / or
When viewed from the second direction, there are two or more pairs of the spring force action points arranged substantially point-symmetrically with respect to a predetermined second reference point, and the points substantially with respect to the second reference point 3. The lens driving device according to claim 2, wherein the acting force of the spring member in the second direction at a pair of symmetrically arranged spring force acting points is substantially equal. The zeroth reference point coincides with the optical axis when viewed from the optical axis direction,
The first reference point is disposed on the optical axis when viewed from the first direction,
The lens driving device according to claim 3, wherein the second reference point is disposed on the optical axis when viewed from the second direction. In the movable body, the first driving force acting point at which the driving force by the first driving mechanism acts is at an even number of two or more places,
When viewed from the optical axis direction, there is at least a pair of the first driving force action points arranged substantially point-symmetrically with respect to a predetermined fifth reference point, and substantially points with respect to the fifth reference point The driving forces at the pair of symmetrically arranged first driving force operating points are substantially equal, and / or
In the movable body, the second driving force acting point at which the driving force by the second driving mechanism acts is at an even number of two or more places,
When viewed from the first direction, there is at least a pair of the second driving force action points arranged substantially point-symmetrically with respect to a predetermined third reference point, and substantially points with respect to the third reference point The driving forces at the pair of symmetrically arranged second driving force operating points are substantially equal, and / or
In the movable body, the third driving force acting point at which the driving force by the third driving mechanism acts is at an even number of two or more places,
When viewed from the second direction, there is at least a pair of third driving force action points arranged substantially point-symmetrically with respect to a predetermined fourth reference point, and substantially points with respect to the fourth reference point 5. The lens driving device according to claim 2, wherein driving forces at a pair of symmetrically arranged third driving force operating points are substantially equal. The fifth reference point coincides with the optical axis when viewed from the optical axis direction,
The third reference point is disposed on the optical axis when viewed from the first direction,
The lens driving device according to claim 5, wherein the fourth reference point is disposed on the optical axis when viewed from the second direction. When viewed from the optical axis direction, the center of gravity of the movable body is arranged closer to the center side of the movable body when viewed from the optical axis direction than the eight spring force action points.
When viewed from the first direction, the center of gravity of the movable body is disposed closer to the center side of the movable body when viewed from the first direction than the eight spring force action points.
When viewed from the second direction, the center of gravity of the movable body is disposed closer to the center side of the movable body when viewed from the second direction than the eight spring force action points. The lens driving device according to claim 1, wherein the lens driving device is a lens driving device. The movable body is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape having an outer peripheral surface substantially parallel to the first direction or the second direction,
The first driving coil is wound along the outer peripheral surface of the movable body,
The lens driving device includes, as the first driving magnet, the first driving magnet disposed so as to face a part of the first driving coil in the first direction, and the first driving magnet in the second direction. The first driving magnet disposed opposite to sandwich a part of the first driving coil, or the lens driving device includes the first driving magnet and the first magnetic piece as the first driving magnet. The first driving magnet and the first magnetic piece, which are arranged to face each other in the first direction so as to sandwich a part of the first driving coil, and the second so as to sandwich a part of the first driving coil. The first driving magnet and the first magnetic piece, which are arranged to face each other in a direction,
The entire region of the first driving coil in the optical axis direction is arranged in the first magnetic field region in the entire movable range of the movable body in the optical axis direction,
The first driving coil is disposed over the entire movable range of the movable body in the first direction and over the entire first magnetic field region in the first direction,
Across the movable range of the movable body in the second direction, of claims 1 to 7, characterized in that the first drive coil in the entire area of the first magnetic field region in the second direction are arranged The lens driving device according to any one of the above. The second driving coil is wound in a substantially rectangular flat plate shape having four second straight sides,
Of the four second straight side portions, one second straight side portion is the second effective coil portion,
The entire second effective coil portion is disposed in the second magnetic field region in the entire movable range of the movable body in the optical axis direction, the first direction, and the second direction, and / or
The third driving coil is wound in a substantially rectangular flat plate shape having four third straight sides,
Of the four third straight side portions, one third straight side portion is the third effective coil portion,
The entire third effective coil section is disposed in the third magnetic field region over the entire movable range of the movable body in the optical axis direction, the first direction, and the second direction. Item 9. The lens driving device according to any one of Items 1 to 8 . The second driving mechanism is wound in a substantially rectangular flat plate shape and has at least two second driving coils each including four second linear sides, and a magnetic flux in the thickness direction of the second driving coil. A second driving magnet to be generated,
The two second driving coils are arranged adjacent to each other so that second adjacent sides that are one of the four second straight sides are adjacent to each other,
The second driving magnet includes a second facing surface facing the two second adjacent side portions,
The second facing surface is magnetized to a single pole,
The second driving coil is wound so that currents in the same direction flow through two adjacent second side portions adjacent to each other, and / or
The third drive mechanism is wound in a substantially rectangular flat plate shape and has at least two third drive coils composed of four third straight sides, and a magnetic flux in the thickness direction of the third drive coil. A third drive magnet to be generated,
The two third driving coils are arranged adjacent to each other such that third adjacent sides that are one of the four third straight sides are adjacent to each other,
The third driving magnet includes a third facing surface facing the two third adjacent sides,
The third facing surface is magnetized to a single pole,
The said 3rd coil for a drive is wound so that the electric current of the same direction may flow into two said 3rd adjacent edge parts adjacent to each other, The one of Claim 1 to 9 characterized by the above-mentioned. Lens drive device. The spring member can be deformed in the optical axis direction, the first direction, and the second direction,
Each of the plurality of the spring force acting point, the optical axis direction, the lens driving according to any one of claims 1 to 10, the spring force of the first direction and the second direction, characterized in that the act apparatus. The spring member is a leaf spring including an arm portion that connects the movable body fixing portion and the fixed body fixing portion;
The arm portion includes a first elongate arm portion for a direction substantially parallel to the longitudinal direction to said first direction, further comprising an elongated second arm portions to a direction substantially parallel to the longitudinal direction in the second direction the lens driving device according to claim 1, wherein 11. The movable body is formed in a substantially rectangular parallelepiped shape or a substantially cubic shape,
The four spring members are rotationally symmetrical by 90 ° about the optical axis so that the movable body fixing portions are fixed to the four corners of the movable body on one end side of the movable body in the optical axis direction. Placed in
The four spring members rotate 90 degrees about the optical axis so that the movable body fixing portions are fixed to the four corners of the movable body on the other end side of the movable body in the optical axis direction. Placed symmetrically,
The four spring members arranged on one end side of the movable body in the optical axis direction and the four spring members arranged on the other end side of the movable body in the optical axis direction are the light The lens driving device according to claim 12 , wherein the lens driving device is substantially plane-symmetric with respect to a predetermined plane orthogonal to the axis. The spring member is disposed on both ends of the movable body in the optical axis direction,
A distance in the optical axis direction between a first plane perpendicular to the optical axis direction and including the second driving force gravity center and the spring force acting point on one end side of the movable body in the optical axis direction; The product of the acting force of the spring member in the first direction at the spring force acting point on one end side of the movable body in the optical axis direction when the movable body moves in the direction is the first plane The distance in the optical axis direction to the spring force acting point on the other end side of the movable body in the optical axis direction, and the movable body in the optical axis direction when the movable body moves in the first direction. Substantially equal to the product of the acting force of the spring member in the first direction at the spring force acting point on the other end side, and / or
A distance in the optical axis direction between a second plane perpendicular to the optical axis direction and including the third driving force gravity center and the spring force acting point on one end side of the movable body in the optical axis direction; The product of the acting force of the spring member in the second direction at the spring force acting point on the one end side of the movable body in the optical axis direction when the movable body moves in the direction is the second plane The distance in the optical axis direction to the spring force acting point on the other end side of the movable body in the optical axis direction, and the movable body in the optical axis direction when the movable body moves in the second direction. the lens driving device according to claim 1, wherein the substantially equal to the product of the acting force in the second direction of the spring member in the spring force acting point of the other end 13. The spring constant of the spring member in the optical axis direction, the lens driving according to any one of claims 1 to 14, characterized in that less than the spring constant of the spring member in a direction substantially perpendicular to the optical axis apparatus. As the spring member, two spring members made of a conductive material to which both ends of a conducting wire forming the first drive coil constituting the first drive mechanism are fixed, and the second drive mechanism Two spring members made of a conductive material to which each of both ends of a conducting wire forming the second driving coil to be configured is fixed, and a conducting wire forming the third driving coil constituting the third driving mechanism the lens driving device according to any one of 15 claims 1, characterized in that it comprises a both end sides of two of said spring member made of a conductive material into which they are fixed. As the spring member, the spring member made of a conductive material to which one end side of the first conductive wire forming the first drive coil constituting the first drive mechanism is fixed, and the second drive mechanism constituting the second drive mechanism. The one end side of the third conductor forming the third driving coil constituting the third drive mechanism and the spring member made of a conductive material to which one end side of the second conductor forming the second driving coil is fixed At least two of the spring member made of a conductive material to be fixed, the other end side of the first conducting wire, the other end side of the second conducting wire, and the other end side of the third conducting wire are fixed. the lens driving device according to any one of 15 claims 1, characterized in that it comprises a said spring member made of a conductive material to be.

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