JP2014186152A - Photographing optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographing optical device that enables the device to be downsized in both directions of an optical axis direction and a direction orthogonal to the optical axis in the photographing optical device having an oscillation correction function.SOLUTION: According to a photographing optical device 1, an oscillation correction mechanism 4 oscillating a camera module 3 to correct an oscillation includes a support part section that serves as a supporting point of the oscillation of the camera module 3 and an oscillation mechanism 9 that oscillates the camera module 3, using a supporting point section as the supporting point, and the oscillation correction mechanism 4 is arranged on an opposite side of a subject of the camera module 3 so as to overlap with the camera module 3 in an optical direction. The oscillation mechanism 9 comprises: a magnetic plate 11; an oscillation correction coil 12; and a core member 13 that has a counter part 13a facing the magnetic plate 11, and is arranged on an inner periphery side of the oscillation correction coil 12. The magnetic plate 11 is anchored at an end face on the opposite side of the subject of the camera module 3, and the oscillation correction coil 12 having the core member 13 arranged on the inner periphery side constitutes a part of a holding member 16 oscillatedly holding the camera module 3.

Description

  The present invention relates to a photographing optical apparatus having a shake correction function for correcting shake of an optical image.

  2. Description of the Related Art Conventionally, there has been known a photographing optical device including a camera module having a lens and an image sensor, and a shake correction device that corrects a shake of an optical image formed on the image sensor by swinging the camera module. (For example, see Patent Document 1). In the photographic optical device described in Patent Document 1, the shake correction device includes a shake correction permanent magnet (a shake correction magnet) and a shake correction coil (a shake correction coil).

  Further, in the photographing optical device described in Patent Document 1, four shake correction coils are integrally formed on the coil substrate. The coil substrate is fixed to the end surface of the inner frame fixed to the outer peripheral surface of the camera module on the side opposite to the subject. Further, in this photographing optical device, a plate-like shake correction magnet is fixed to the outer frame that holds the inner frame in a swingable manner. The shake correction magnet is arranged so that its thickness direction and the optical axis direction substantially coincide. Further, the shake correction magnet is disposed on the opposite side of the coil substrate, and the shake correction magnet and the coil substrate face each other in the optical axis direction.

JP 2010-78842 A

  In the photographing optical device described in Patent Document 1, a coil substrate is fixed to an end surface of the inner frame on the side opposite to the subject. In this photographic optical device, the shake correction magnet is disposed on the side opposite to the subject with respect to the coil substrate, and the shake correction magnet and the coil substrate face each other in the optical axis direction. Therefore, in this photographing optical device, it is possible to reduce the size of the device in a direction orthogonal to the optical axis direction. However, in this optical device for photographing, since the shake correction magnet is a permanent magnet, it is difficult to appropriately magnetize the shake correction magnet unless the thickness of the shake correction magnet is secured to some extent. is there. That is, in this photographing optical apparatus, the thickness of the shake correction magnet is increased, and as a result, the apparatus may be increased in size in the optical axis direction.

  Accordingly, an object of the present invention is to reduce the size of an optical apparatus for photographing having a shake correction function for correcting shake of an optical image in both the optical axis direction and the direction orthogonal to the optical axis direction. It is an object of the present invention to provide a photographing optical device that can perform the above-described operation.

  In order to solve the above-described problems, an imaging optical device according to the present invention forms an image on a camera module having a lens and an image sensor and by swinging the camera module so that the optical axis of the lens is tilted. A shake correction mechanism for correcting shake of the optical image, and the shake correction mechanism includes a fulcrum portion that serves as a fulcrum of the camera module, and a swing mechanism that swings the camera module with the fulcrum as a fulcrum. And is disposed on the opposite side of the camera module so as to overlap the camera module in the optical axis direction of the lens, and the swing mechanism is formed of a soft magnetic material and is disposed substantially orthogonal to the optical axis direction. It is formed of a soft magnetic material and has a magnetic plate, a shake correction coil formed by being wound in a cylindrical shape or a frame shape, and a facing portion facing the magnetic plate with a predetermined gap therebetween. A core member disposed on the inner peripheral side of the shake correction coil, and either the shake correction coil or the magnetic plate in which the core member is disposed on the inner peripheral side is on the opposite side of the camera module The other one of the shake correction coil and the magnetic plate fixed to the end surface and having the core member disposed on the inner peripheral side constitutes at least a part of a holding portion that holds the camera module in a swingable manner. It is characterized by.

  In the photographic optical device of the present invention, the shake correction mechanism is disposed on the opposite side of the camera module so as to overlap the camera module in the optical axis direction of the lens. Therefore, in the present invention, it is possible to reduce the size of the photographing optical device in the direction orthogonal to the optical axis direction. In the present invention, the swing mechanism includes a magnetic plate formed of a soft magnetic material instead of a permanent magnet. Therefore, in the present invention, as compared with the case where the magnet plate made of a permanent magnet is arranged so as to be substantially orthogonal to the optical axis direction as in the photographing optical device described in Patent Document 1, it is substantially orthogonal to the optical axis direction. Thus, the thickness of the magnetic plate arranged can be reduced. Therefore, in the present invention, it is possible to reduce the size of the photographing optical device even in the optical axis direction. Furthermore, in the present invention, since at least a part of the core member is disposed on the inner peripheral side of the shake correction coil, the driving force of the swing mechanism is ensured even if a magnetic plate is provided instead of the permanent magnet. It becomes possible to do.

  In the present invention, the shake correction coil is formed by being wound with the optical axis direction being the axial direction of the winding, the core member is formed in a straight column shape or a flat plate shape, and the facing portion is the core member in the optical axis direction It is preferable that the magnetic plate and the facing portion face each other in the optical axis direction. If comprised in this way, since the core member is formed in the shape of a right pillar or flat plate, it becomes possible to simplify the structure of a core member. Further, even if the magnetic plate disposed so as to be substantially orthogonal to the optical axis direction is formed in a flat plate shape, a magnetic path can be formed between the magnetic plate and the facing portion. That is, the configuration of the magnetic plate can be simplified. Therefore, the configuration of the swing mechanism can be simplified.

  In the present invention, the swing mechanism preferably includes a second magnetic plate formed of a soft magnetic material and in contact with the other end surface of the core member in the optical axis direction. If comprised in this way, it will become possible to suppress the leakage of the magnetic flux which the shake correction coil generates with the second magnetic plate.

  In the present invention, the photographing optical device is formed so that the shape when viewed from the optical axis direction is a substantially square shape, and when viewed from the optical axis direction, the fulcrum portion is substantially the center of the optical device for photographing. It is preferable that four shake correction coils with the core member arranged on the inner peripheral side are arranged at each of the four corners of the photographing optical device. With this configuration, the distance between the fulcrum portion and the shake correction coil can be increased. Therefore, even if the driving force of the swing mechanism is reduced, it is possible to swing the camera module appropriately. That is, even if the camera module can be properly swung, the driving force of the swinging mechanism can be reduced, and as a result, the swinging mechanism can be downsized.

  In the present invention, the shake correction coil is formed by being wound with the direction orthogonal to the optical axis direction as the axial direction of the winding, and when viewed from the optical axis direction, the plurality of shake correction coils have fulcrum portions. You may arrange | position radially at the center. In this case, the length of the shake correction coil in the axial direction of the winding can be increased. Therefore, it is possible to increase the number of turns of the conducting wire constituting the shake correction coil, and as a result, it is possible to increase the driving force of the swing mechanism.

  In the present invention, for example, the core member is formed in a substantially rectangular flat plate shape or a straight column shape whose longitudinal direction is the winding axial direction of the shake correction coil, and the end surface on the fulcrum side of the core member is the inner end surface, When the end surface opposite to the inner end surface is an outer end surface, the outer end surface is a facing portion, and the magnetic plate is formed so that a magnetic plate-side facing portion facing the facing portion protrudes in the optical axis direction, The facing portion and the magnetic plate side facing portion face each other in the axial direction of winding of the shake correction coil. In this case, the configuration of the core member can be simplified.

  In the present invention, the core member includes a first core portion formed in a substantially rectangular flat plate shape or a straight column shape in which the axial direction of winding of the shake correction coil is a longitudinal direction, and the first core member If the end surface on the fulcrum side is the inner end surface, and the end surface opposite to the inner end surface is the outer end surface, it has a projecting portion that projects in the optical axis direction from the outer end surface, and the tip surface of the projecting portion is the opposing portion. The facing portion and the magnetic plate may face each other in the optical axis direction. In this case, since the magnetic plate disposed so as to be substantially orthogonal to the optical axis direction only needs to be formed in a flat plate shape, the configuration of the magnetic plate can be simplified.

  In the present invention, the shake correction mechanism includes a fulcrum member having a fulcrum portion and formed of a soft magnetic material, and the swing mechanism is formed of a soft magnetic material and the third end surface of the core member is in contact with the fulcrum member. It is preferable that a magnetic plate is provided, and the fulcrum member is in contact with the third magnetic plate and is in contact with the magnetic plate. With this configuration, the core member, the third magnetic plate, the fulcrum member, and the magnetic plate form a magnetic path through which the lines of magnetic force generated by the shake correction coil pass. Therefore, the magnetic efficiency of the swing mechanism can be increased.

  In the present invention, the swing mechanism includes a coil holding member that holds a plurality of shake correction coils, and the coil holding member is formed so that an arrangement recess in which the shake correction coil is arranged is recessed in the optical axis direction. Preferably it is. With this configuration, even if a plurality of shake correction coils that are formed by winding with the direction orthogonal to the optical axis direction as the axial direction of the winding are held by the coil holding member, they swing in the optical axis direction. The mechanism can be miniaturized.

  In the present invention, the shake correction mechanism includes a fulcrum member having a fulcrum portion, the swing mechanism includes a coil holding member that holds a shake correction coil, and the fulcrum member is fixed to the coil holding member or the magnetic plate. Preferably it is. In this case, it is not necessary to separately provide a structure for fixing the fulcrum member in addition to the coil holding member and the magnetic plate. Therefore, the configuration of the shake correction mechanism can be simplified.

  In the present invention, the surface of the shake correction coil is preferably covered with an insulating film. With this configuration, even if the shake correction coil and the magnetic plate come into contact with each other due to, for example, an impact when the photographic optical device is dropped, it is possible to prevent a short circuit of the shake correction coil.

  In the present invention, for example, the swing mechanism includes a coil holding member that holds a shake correction coil, and the shake correction mechanism includes a first fixing portion that is fixed to the coil holding member and a second fixing that is fixed to the magnetic plate. A spring member having a fixing portion and an arm portion connecting the first fixing portion and the second fixing portion, the spring member being disposed between the coil holding member and the magnetic plate, and the arm portion being bent. With this, the camera module can be swung.

  As described above, according to the present invention, in a photographing optical device having a shake correction function for correcting shake of an optical image, the size of the device can be reduced in both the optical axis direction and the direction orthogonal to the optical axis direction. It becomes possible to do.

1 is a side view of a photographing optical device according to an embodiment of the present invention. It is a disassembled perspective view of the optical device for imaging shown in FIG. It is a disassembled perspective view for demonstrating the structure of the shake correction mechanism concerning other embodiment of this invention. It is sectional drawing for demonstrating the structure of the shake correction mechanism concerning other embodiment of this invention.

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

(Configuration of optical device for photographing)
FIG. 1 is a side view of a photographing optical device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the photographing optical device 1 shown in FIG. In the following description, as shown in FIG. 1, the three directions orthogonal to each other are the X direction, the Y direction, and the Z direction, the X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. To do. The Z1 direction side is the “upper” side, and the Z2 direction side is the “lower” side.

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

  The photographic optical device 1 corrects a shake of an optical image formed on the image pickup device by swinging the camera module 3 so that the optical axis L of the lens is tilted and the camera module 3 having the lens and the image pickup device. And a shake correction mechanism 4 for this purpose. In this embodiment, the vertical direction substantially coincides with the optical axis direction of the camera module 3 when the camera module 3 is not swinging. In this embodiment, an image sensor is mounted on the lower end side of the camera module 3, and a subject placed on the upper side is photographed. That is, in this embodiment, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the anti-subject side (imaging element side, image side).

  The camera module 3 is formed in a substantially quadrangular prism shape as a whole. The camera module 3 of this embodiment is formed so that the shape when viewed from the optical axis direction is a substantially square shape, and the four side surfaces of the camera module 3 are substantially parallel to the left-right direction or the front-rear direction. Yes. The camera module 3 includes a lens for forming an optical image on an image sensor, a movable body that holds the lens and is movable in the optical axis direction, and a movable body that emits light through a spring member such as a leaf spring. A holding body that is held so as to be movable in the axial direction, and a lens driving mechanism that drives the movable body in the optical axis direction with respect to the holding body. In addition, the camera module 3 includes a substrate 6 on which an image sensor and the like are mounted.

  The lens driving mechanism is, for example, a voice coil motor including a lens driving coil fixed to the outer peripheral surface of the movable body, and a lens driving magnet fixed to the holding body and arranged to face the outer peripheral surface of the lens driving coil. is there. The substrate 6 is formed in a substantially square plate shape. The substrate 6 is fixed to the lower surface of the holding body and constitutes the lower end surface of the camera module 3. In the camera module 3, when an electric current is supplied to the lens driving coil constituting the lens driving mechanism, the lens moves in the optical axis direction together with the movable body. The lens driving mechanism may include a piezoelectric element for moving the lens in the optical axis direction or a shape memory alloy instead of the lens driving coil and the lens driving magnet.

  The shake correction mechanism 4 includes a fulcrum member 8 having a fulcrum portion 8a that serves as a fulcrum of the camera module 3, and a swing mechanism 9 that swings the camera module 3 with the fulcrum portion 8a as a fulcrum. The shake correction mechanism 4 is disposed so as to overlap the camera module 3 in the optical axis direction. Further, the shake correction mechanism 4 is disposed below the camera module 3 (that is, on the side opposite to the subject). In this embodiment, when viewed from the optical axis direction, the outer shape of the camera module 3 and the outer shape of the shake correction mechanism 4 are substantially the same.

  The swing mechanism 9 includes a magnetic plate 11 made of a soft magnetic material, four shake correction coils 12 formed by winding in a substantially rectangular or substantially square frame shape, and a shake correction coil 12. A core member 13 disposed on the inner peripheral side, a coil holding member 14 that holds the four shake correction coils 12, and a first end surface that is formed of a soft magnetic material and forms an end surface on the side opposite to the subject of the photographing optical device 1. And a magnetic plate 15 as a second magnetic plate. In this embodiment, the shake correction coil 12, the core member 13, the coil holding member 14, and the magnetic plate 15 constitute a holding portion 16 that holds the camera module 3 in a swingable manner. Further, the shake correction mechanism 4 includes a leaf spring 17 as a spring member that connects the camera module 3 and the holding unit 16.

  The magnetic plate 11 is formed in a substantially square flat plate shape. The magnetic plate 11 is fixed to the lower surface of the substrate 6 so as to be substantially orthogonal to the optical axis direction. That is, the magnetic plate 11 is fixed to the end surface on the side opposite to the subject of the camera module 3 so that the thickness direction thereof substantially coincides with the optical axis direction. The shake correction coil 12 is formed by being wound with the optical axis direction as the axial direction of the winding. That is, the inner peripheral side of the shake correction coil 12 is a through hole penetrating in the optical axis direction. The surface of the shake correction coil 12 is covered with an insulating film.

  The core member 13 is made of a soft magnetic material. The core member 13 is formed in a flat substantially quadrangular prism shape or a substantially square flat plate shape. In this embodiment, the thickness of the core member 13 in the optical axis direction is substantially equal to the thickness of the shake correction coil 12 in the optical axis direction, and the entire core member 13 is disposed on the inner peripheral side of the shake correction coil 12. Has been.

  The coil holding member 14 is made of a nonmagnetic material. The coil holding member 14 is formed by cutting out its four corners from a substantially square flat plate into a substantially square shape. That is, the coil holding member 14 is formed in a substantially cross shape. The coil holding member 14 is disposed so that the thickness direction and the optical axis direction substantially coincide with each other. The thickness of the coil holding member 14 in the optical axis direction is substantially equal to the thickness of the core member 13 and the thickness of the shake correction coil 12 in the optical axis direction. Each of the four shake correction coils 12 in which the core member 13 is disposed on the inner peripheral side is fixed to each of the notches at the four corners of the coil holding member 14. The coil holding member 14 to which the four shake correction coils 12 are fixed is formed in a substantially square flat plate shape, and the four shake correction coils 12 are for photographing when viewed from the optical axis direction. Arranged at each of the four corners of the optical device 1.

  The magnetic plate 15 is formed in a substantially square flat plate shape. The magnetic plate 15 is fixed to the lower surface of the coil holding member 14 so as to be substantially orthogonal to the optical axis direction. The lower end surface of the core member 13 is in contact with the upper surface of the magnetic plate 15. In this embodiment, the outer shape of the magnetic plate 11 when viewed from the optical axis direction, the outer shape of the coil holding member 14 with the shake correction coil 12 attached, and the outer shape of the magnetic plate 15 are substantially the same. .

  The fulcrum member 8 includes an annular fixed portion 8b that is fixed to the upper surface of the coil holding member 14, and a convex curved surface portion 8c that rises upward from the inner peripheral end of the fixed portion 8b. . The curved surface portion 8c is a convex curved surface formed by cutting a part of a spherical surface. The upper end of the curved surface portion 8c is in contact with the lower surface of the magnetic plate 11, and the upper end of the curved surface portion 8c is a fulcrum portion 8a. The fulcrum member 8 is fixed to the coil holding member 14 so that the center of the coil holding member 14 and the center of the fulcrum member 8 (that is, the fulcrum portion 8a) substantially coincide with each other when viewed from the optical axis direction. The part 8a is disposed at substantially the center of the photographing optical device 1 when viewed from the optical axis direction. Moreover, the fulcrum part 8a is arrange | positioned in the position through which the optical axis L passes.

  The leaf spring 17 includes a first fixing portion that is fixed to the coil holding member 14, a second fixing portion that is fixed to the magnetic plate 11, and an arm portion that connects the first fixing portion and the second fixing portion. Yes. The leaf spring 17 is disposed between the magnetic plate 11 and the coil holding member 14 in the optical axis direction. In this embodiment, the arm part of the leaf spring 17 is bent, so that the camera module 3 can swing with respect to the holding part 16. A through hole 17a in which the curved surface portion 8c of the fulcrum member 8 is disposed is formed at the center of the leaf spring 17 (more specifically, the center of the first fixed portion). The through hole 17a penetrates the leaf spring 17 in the vertical direction. Note that the leaf spring 17 generates a pressurizing force for reliably abutting the fulcrum portion 8a and the magnetic plate 11 (that is, an urging force for urging the camera module 3 downward). ), Fixed in a bent state. 1 and 2 show a leaf spring 17 with a simplified shape, and the first fixing portion, the second fixing portion, and the arm portion are not shown.

  The upper end surface of the core member 13 is opposed to the lower surface of the magnetic plate 11 with a predetermined gap. That is, the core member 13 and the magnetic plate 11 face each other in the optical axis direction. In this embodiment, the upper end surface of the core member 13 is a facing portion 13a that faces the magnetic plate 11 via a predetermined gap.

  In the photographic optical device 1, when a change in the tilt of the camera module 3 is detected by a gyroscope mounted at a predetermined position, a current is supplied to the shake correction coil 12 based on the detection result of the gyroscope. The When a current is supplied to the shake correction coil 12, a magnetic attractive force is generated between the upper end surface of the core member 13 (that is, the facing portion 13 a) and the magnetic plate 11. Further, when a magnetic attractive force is generated between the facing portion 13a and the magnetic plate 11, the camera module 3 swings around the fulcrum portion 8a so that the optical axis L is inclined, and the shake is corrected.

(Main effects of this form)
As described above, in this embodiment, the shake correction mechanism 4 is disposed below the camera module 3 so as to overlap the camera module 3 in the optical axis direction. Therefore, in this embodiment, it is possible to reduce the size of the photographing optical device 1 in the front-rear and left-right directions. Further, the swing mechanism 9 of this embodiment includes a magnetic plate 11 formed of a soft magnetic material instead of a permanent magnet. Therefore, in this embodiment, as compared with a case where a magnet plate made of a permanent magnet is arranged so as to be substantially orthogonal to the optical axis direction as in the photographing optical device described in Patent Document 1, it is substantially orthogonal to the optical axis direction. Thus, the thickness of the magnetic plate 11 arranged in such a manner can be reduced. Therefore, in this embodiment, it is possible to reduce the size of the photographing optical device 1 also in the optical axis direction. Further, in this embodiment, since the core member 13 is disposed on the inner peripheral side of the shake correction coil 12, the driving force of the swing mechanism 9 is ensured even when the magnetic plate 11 is provided instead of the permanent magnet. It becomes possible to do.

  In this embodiment, the magnetic plate 11 and the facing portion 13a of the core member 13 are opposed in the optical axis direction. Therefore, in this embodiment, even if the magnetic plate 11 arranged so as to be substantially orthogonal to the optical axis direction is formed in a flat plate shape, a magnetic path can be formed between the magnetic plate 11 and the facing portion 13a. become. That is, in this embodiment, the configuration of the magnetic plate 11 can be simplified. In this embodiment, since the core member 13 is formed in a flat plate shape of a substantially quadrangular prism or a substantially square shape, the configuration of the core member 13 can be simplified. Therefore, in this embodiment, the configuration of the swing mechanism 9 can be simplified.

  In this embodiment, when viewed from the optical axis direction, the fulcrum portion 8a is arranged at the approximate center of the photographing optical device 1, and the four shake correction coils 12 with the core member 13 arranged on the inner peripheral side are These are arranged at each of the four corners of the photographing optical device 1. Therefore, in this embodiment, it is possible to increase the distance between the fulcrum portion 8a and the shake correction coil 12. Therefore, in this embodiment, the camera module 3 can be swung appropriately even if the driving force of the swing mechanism 9 is reduced. In other words, in this embodiment, even if the camera module 3 can be properly swung, the driving force of the swinging mechanism 9 can be reduced, and as a result, the swing constituting the swinging mechanism 9 can be reduced. The correction coil 12 and the like can be downsized.

  In this embodiment, the fulcrum member 8 is fixed to a coil holding member 14 that holds the shake correction coil 12. Therefore, in this embodiment, in addition to the coil holding member 14, it is not necessary to separately provide a configuration for fixing the fulcrum member 8. Therefore, in this embodiment, the configuration of the shake correction mechanism 4 can be simplified. In this embodiment, since the lower end surface of the core member 13 is in contact with the upper surface of the magnetic plate 15, the magnetic plate 15 can suppress leakage of magnetic flux generated by the shake correction coil 12. In this embodiment, since the surface of the shake correction coil 12 is covered with an insulating film, the shake correction coil 12 and the magnetic plate 11 are caused by, for example, an impact when the photographing optical device 1 is dropped. Even if they come into contact with each other, it is possible to prevent a short circuit of the shake correction coil 12.

  Note that the fulcrum member 8 of this embodiment may be formed of a soft magnetic material or a nonmagnetic material. When the fulcrum member 8 is formed of a soft magnetic material, the core member 13, the magnetic plate 15 fulcrum member 8, and the magnetic plate 11 form a magnetic path through which magnetic lines generated by the shake correction coil 12 pass. Therefore, in this case, the magnetic efficiency of the swing mechanism 9 can be increased.

(Modification of shake correction mechanism)
FIG. 3 is an exploded perspective view for explaining the configuration of a shake correction mechanism 4 according to another embodiment of the present invention. 4A is a cross-sectional view for explaining the configuration of the shake correction mechanism 4 shown in FIG. FIG. 4B is a cross-sectional view for explaining the configuration of a variation of the shake correction mechanism 4 shown in FIG.

  In the embodiment described above, the shake correction mechanism 4 includes the shake correction coil 12 that is formed by being wound with the optical axis direction as the winding axial direction. In addition to this, for example, as shown in FIGS. 3 and 4, the shake correction mechanism 4 is formed by being wound with the direction orthogonal to the optical axis direction as the axial direction of the winding instead of the shake correction coil 12. The shake correction coil 22 may be provided. Hereinafter, the configuration of the swing mechanism 19 having the shake correction coil 22 will be described. 3 and 4, the same or similar configurations as those described above are denoted by the same reference numerals.

  The swing mechanism 19 includes a magnetic plate 21 made of a soft magnetic material, four shake correction coils 22 formed by being wound in a substantially long cylindrical shape, and an inner peripheral side of the shake correction coil 22. The core member 23 to be arranged, the coil holding member 24 for holding the four shake correction coils 22, and the magnetic plate as a third magnetic plate made of a soft magnetic material and arranged at the center of the coil holding member 24 25. In this embodiment, the shake correction coil 22, the core member 23, the coil holding member 24, and the magnetic plate 25 constitute a holding portion 26 that holds the camera module 3 so as to be swingable.

  The magnetic plate 21 includes a base portion 21a formed in a substantially square flat plate shape, and protruding portions 21b that protrude downward from the four corners of the base portion 21a. The magnetic plate 21 is fixed to the lower surface of the substrate 6 so that the base portion 21a is substantially orthogonal to the optical axis direction. That is, the magnetic plate 21 is fixed to the end surface of the camera module 3 on the side opposite to the subject so that the thickness direction of the base portion 21a substantially coincides with the optical axis direction. The protrusion 21b is formed in a substantially rectangular flat plate shape. The protrusion 21b is inclined by about 45 ° with respect to the left-right direction and the front-rear direction.

  As described above, the shake correction coil 22 is formed by being wound with the direction orthogonal to the optical axis direction as the axial direction of the winding. That is, the inner peripheral side of the shake correction coil 22 is a through-hole penetrating in a direction orthogonal to the optical axis direction. The surface of the shake correction coil 22 is covered with an insulating film. The core member 23 is made of a soft magnetic material. The core member 23 is formed in a substantially rectangular flat plate shape with the axial direction of winding of the shake correction coil 22 as the longitudinal direction. The length of the core member 23 is substantially equal to the length of the shake correction coil 22, and the entire core member 23 is disposed on the inner peripheral side of the shake correction coil 22.

  The coil holding member 24 is made of a nonmagnetic material. The coil holding member 24 is formed in a substantially octagonal flat plate shape. The coil holding member 24 is disposed so that its thickness direction and the optical axis direction substantially coincide. On the upper surface of the coil holding member 24, a cross-shaped recess 24a is formed so as to be recessed downward. The concave portion 24a is formed at the center of the coil holding member 24 and has a substantially square central portion 24b that forms the center of the concave portion 24a, and extends radially from the central portion 24b in a direction inclined by 45 ° with respect to the front-rear direction and the left-right direction. It is comprised from the piece of radial part 24c. The depth of the recess 24a is substantially equal to the thickness of the shake correction coil 22 in the optical axis direction.

  In each of the four radial portions 24c, each of the four shake correction coils 22 is disposed. Similarly to the embodiment described above, the fulcrum member 8 is fixed to the coil holding member 24 so that the center of the coil holding member 24 and the fulcrum portion 8a substantially coincide with each other when viewed from the optical axis direction. When viewed from, the four shake correction coils 22 are arranged radially about the fulcrum portion 8a. The length of the radially extending radial portion 24c and the length of the shake correcting coil 22 are substantially equal, and the shake correcting coil 22 is disposed over the entire area of the radial portion 24c. The radial portion 24c is an arrangement recess in which the shake correction coil 22 is arranged.

  The magnetic plate 25 is formed in a substantially square flat plate shape. The magnetic plate 25 is fixed to the central portion 24 b of the coil holding member 24. The size of the magnetic plate 25 is substantially equal to the size of the central portion 24b. The thickness of the magnetic plate 25 is substantially equal to the depth of the recess 24a, the lower surface of the magnetic plate 25 is in contact with the upper surface of the center portion 24b, and the upper surface of the magnetic plate 25 and the upper surface of the coil holding member 24 are And the magnetic plate 25 are fixed to the coil holding member 24 so that they substantially coincide with each other. In addition, the thickness of the magnetic plate 25 may be thinner than the depth of the recess 24a. In this case, for example, the upper surface of the magnetic plate 25 is fixed to the lower surface of the fulcrum member 8 so that the upper surface of the magnetic plate 25 and the upper surface of the coil holding member 24 substantially coincide with each other.

  The end surface of the core member 23 on the fulcrum part 8a side (that is, the end surface on the inner side in the lens radial direction) is the inner end surface 23a, and the end surface of the core member 23 opposite to the inner end surface 23a (that is, the outer side in the lens radial direction). Is the outer end surface 23b, the lower end of the protrusion 21b of the magnetic plate 21 is disposed below the lower surface of the shake correction coil 22 and above the lower surface of the coil holding member 24. The outer end surface 23b faces the protruding portion 21b of the magnetic plate 21 with a predetermined gap. That is, the outer end face 23b and the protruding portion 21b face each other in the axial direction of winding of the shake correction coil 22. In the swing mechanism 19, the outer end surface 23 b is a facing portion that faces the magnetic plate 21 with a predetermined gap, and the protruding portion 21 b is a magnetic plate side facing portion that faces the outer end surface 23 b that is the facing portion. .

  The inner end surface 23 a of the core member 23 is in contact with the outer peripheral end surface of the magnetic plate 25. Further, the lower surface of the fulcrum member 8 is in contact with the upper surface of the magnetic plate 25, and the fulcrum portion 8 a of the fulcrum member 8 is in contact with the base portion 21 a of the magnetic plate 21. In the oscillating mechanism 19, the fulcrum member 8 is made of a soft magnetic material, and the core member 23, the magnetic plate 25, the fulcrum member 8, and the magnetic plate 21 pass through the magnetic field lines generated by the shake correction coil 22. A road is formed.

  In the swing mechanism 19 shown in FIGS. 3 and 4A, the shake correction coil 22 is formed by being wound with the direction orthogonal to the optical axis direction being the winding axial direction. Compared with the shake correction coil 12, the length of the shake correction coil 22 in the axial direction of winding can be increased. Therefore, in this case, it is possible to increase the number of turns of the conducting wire constituting the shake correction coil 22, and as a result, it is possible to increase the driving force of the swing mechanism 19. In the swing mechanism 19, the fulcrum member 8 is made of a soft magnetic material, and the magnetic force lines generated by the shake correction coil 22 pass through the core member 23, the magnetic plate 25, the fulcrum member 8, and the magnetic plate 21. Since the magnetic path is formed, the magnetic efficiency of the swing mechanism 19 can be increased.

  In the swing mechanism 19, the coil holding member 24 is formed with a radial portion 24 c where the shake correction coil 22 is disposed. The depth of the radial portion 24 c is equal to the thickness of the shake correction coil 22 in the optical axis direction. Therefore, even if the shake correction coil 22 formed by winding with the direction orthogonal to the optical axis direction as the axial direction of the winding is held by the coil holding member 24, the vibration correction coil 22 does not swing in the optical axis direction. The moving mechanism 19 can be downsized. Further, in the swing mechanism 19, it is only necessary that the core member 23 is formed in a substantially rectangular flat plate shape, so that the configuration of the core member 23 can be simplified.

  In the example shown in FIGS. 3 and 4A, the magnetic plate 21 includes a base portion 21a and a protruding portion 21b. However, the magnetic plate 21 is similar to the magnetic plate 11 having the above-described form. Alternatively, it may be formed in a substantially square flat plate shape. In this case, as shown in FIG. 4B, the core member 23 is formed in a substantially rectangular flat plate shape whose longitudinal direction is the winding axial direction of the shake correction coil 22. It has. Further, the end surface on the fulcrum 8a side of the first core portion 23c (that is, the inner end surface in the radial direction of the lens) is the inner end surface 23d, and the end surface of the first core portion 23c opposite to the inner end surface 23d (that is, the end surface) When the outer end surface in the lens radial direction) is defined as the outer end surface, the outer peripheral end surface of the first core portion 23c protrudes outward in the radial direction from the outer end of the shake correction coil 22 in the lens radial direction. The core member 23 is formed with a protruding portion 23e that protrudes upward from the outer end surface of the first core portion 23c.

  In this case, the front end surface of the protruding portion 23e (that is, the upper end surface of the protruding portion 23e) faces the lower surface of the magnetic plate 21 with a predetermined gap. That is, the front end surface of the protrusion 23e and the magnetic plate 11 are opposed to each other in the optical axis direction, and the front end surface of the protrusion 23e is a facing portion 23f that faces the magnetic plate 15 with a predetermined gap. . In this case, the inner end surface 23 d of the first core portion 23 c is in contact with the outer peripheral end surface of the magnetic plate 25. In this case, since the magnetic plate 21 only needs to be formed in a flat plate shape, the configuration of the magnetic plate 21 can be simplified.

(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 fixed portion 8 b of the fulcrum member 8 is fixed to the upper surface of the coil holding member 14, and the fulcrum portion 8 a is in contact with the lower surface of the magnetic plate 11. In addition, for example, the fixed portion 8 b of the fulcrum member 8 may be fixed to the lower surface of the magnetic plate 11, and the fulcrum portion 8 a may be in contact with the upper surface of the coil holding member 14. Similarly, in the shake correction mechanism 4 shown in FIGS. 3 and 4, the fixed portion 8 b of the fulcrum member 8 is fixed to the upper surface of the coil holding member 24, and the fulcrum portion 8 a is in contact with the lower surface of the magnetic plate 21. The fixed portion 8 b of the fulcrum member 8 may be fixed to the lower surface of the magnetic plate 21, and the fulcrum portion 8 a may be in contact with the magnetic plate 25 fixed to the coil holding member 24. In addition, the shake correction mechanism 4 may include a fulcrum member formed in a spherical shape instead of the fulcrum member 8. In this case, for example, the coil holding member 14 or the magnetic plate 25 is formed with a holding portion for preventing the fulcrum member from shifting in the front-rear and left-right directions. Abut.

  In the embodiment described above, the magnetic plate 11 is fixed to the end surface of the camera module 3 on the side opposite to the subject, and the camera module 3 is swung by the shake correction coil 12, the core member 13, the coil holding member 14, and the magnetic plate 15. A holding portion 16 is configured to hold it as possible. In addition to this, for example, the upper surface of the magnetic plate 15 is fixed to the end surface on the side opposite to the subject of the camera module 3, and the coil holding member 14 to which the shake correction coil 12 is fixed is fixed to the lower surface of the magnetic plate 15 ( That is, the shake correction coil 12 is fixed to the end surface of the camera module 3 on the side opposite to the subject via the magnetic plate 15), and a holding unit that holds the camera module 3 so as to be swingable by the magnetic plate 11 is configured. Also good. In this case, for example, the fixed portion 8 b of the fulcrum member 8 is fixed to the upper surface of the magnetic plate 11, and the fulcrum portion 8 a contacts the coil holding member 14. In this case, the first fixing portion of the leaf spring 17 is fixed to the magnetic plate 11, and the second fixing portion is fixed to the coil holding member 14.

  Similarly, in the shake correction mechanism 4 shown in FIGS. 3 and 4, the magnetic plate 21 is fixed to the end surface on the side opposite to the subject of the camera module 3, and the shake correction coil 22, the core member 23, and the coil holding member 24 are used. The magnetic plate 25 constitutes a holding portion 26 that holds the camera module 3 so as to be able to swing, but the surface of the coil holding member 24 on which the shake correction coil 22 is not attached is opposite to the camera module 3. While being fixed to the end surface on the subject side (that is, the shake correction coil 22 is fixed to the end surface on the opposite side of the camera module 3 via the coil holding member 24), the camera module 3 is shaken by the magnetic plate 21. A holding part that holds the movable part may be configured. In this case, for example, the fixed portion 8 b of the fulcrum member 8 is fixed to the upper surface of the magnetic plate 21, and the fulcrum portion 8 a contacts the magnetic plate 25 fixed to the coil holding member 24. In this case, the first fixing portion of the leaf spring 17 is fixed to the magnetic plate 21, and the second fixing portion is fixed to the coil holding member 24.

  In the embodiment described above, each of the four shake correction coils 12 is disposed at each of the four corners of the photographing optical device 1 when viewed from the optical axis direction. In addition, for example, each of the four shake correction coils 12 may be disposed on each of the four sides of the photographing optical device 1 when viewed from the optical axis direction.

  In the embodiment described above, the swing mechanism 9 includes four shake correction coils 12 and a coil holding member 14. In addition, for example, the swing mechanism 9 includes a sheet-like coil integrally including four coil portions as a shake correction coil, instead of the four shake correction coils 12 and the coil holding member 14. May be. The sheet coil in this case is, for example, an FP coil configured by forming four coil portions made of fine copper wiring on a printed board.

  In the embodiment described above, the photographic optical device 1 has an autofocus function, but the photographic optical device 1 may not have an autofocus function. In the embodiment described above, the swing mechanism 9 includes the magnetic plate 15, but the swing mechanism 9 may not include the magnetic plate 15. In the shake correction mechanism 4 shown in FIGS. 3 and 4, the swing mechanism 19 includes the magnetic plate 25, but the swing mechanism 19 may not include the magnetic plate 25.

  In the embodiment described above, the photographing optical device 1 is formed so as to have a substantially square shape when viewed from the optical axis direction. However, the photographing optical device 1 is formed when viewed from the optical axis direction. You may form so that a shape may become a substantially rectangular shape. The photographing optical device 1 may be formed so that the shape when viewed from the optical axis direction is another polygonal shape, and the shape when viewed from the optical axis direction is a circular shape or an elliptical shape. It may be formed as follows. Similarly, the camera module 3 may be formed so that the shape when viewed from the optical axis direction is substantially rectangular. Further, the camera module 3 may be formed such that the shape when viewed from the optical axis direction is other polygonal shape, or the shape when viewed from the optical axis direction is a circular shape or an elliptical shape. May be formed.

  In the shake correction mechanism 4 shown in FIGS. 3 and 4, the fulcrum member 8 made of a soft magnetic material and the magnetic plate 25 are separate members. In addition, for example, the fulcrum member 8 made of a soft magnetic material and the magnetic plate 25 may be one member.

DESCRIPTION OF SYMBOLS 1 Optical device for imaging | photography 3 Camera module 4 Shake correction mechanism 8 Support point member 8a Support point part 9, 19 Oscillation mechanism 11, 21 Magnetic plate 12, 22 Shake correction coil 13, 23 Core member 13a, 23f Opposing part 14, 24 Coil Holding member 15 Magnetic plate (second magnetic plate)
16, 26 Holding part 17 Leaf spring (spring member)
21b Protruding part (magnetic plate side facing part)
23a, 23d Inner end face 23b Outer end face (opposing part)
23c 1st core part 23e Protrusion part 24c Radial part (arrangement recessed part)
25 Magnetic plate (third magnetic plate)
L Optical axis Z Optical axis direction Z2 Opposite subject side

Claims (12)

A camera module having a lens and an image sensor; and a shake correction mechanism for correcting a shake of an optical image formed on the image sensor by swinging the camera module so that an optical axis of the lens is inclined. Prepared,
The shake correction mechanism includes a fulcrum portion serving as a fulcrum of the camera module, and a swing mechanism that swings the camera module with the fulcrum as a fulcrum, and in the optical axis direction of the lens. Arranged on the opposite side of the camera module so as to overlap the camera module,
The swing mechanism includes a magnetic plate formed of a soft magnetic material and disposed so as to be substantially orthogonal to the optical axis direction, a shake correction coil formed by being wound in a cylindrical shape or a frame shape, and the magnetic A core member that has a facing portion that opposes the plate through a predetermined gap and is formed of a soft magnetic material, and at least a portion thereof is disposed on the inner peripheral side of the shake correction coil,
Either the shake correction coil or the magnetic plate in which the core member is disposed on the inner peripheral side is fixed to an end surface of the camera module on the side opposite to the subject,
The other one of the shake correction coil and the magnetic plate in which the core member is disposed on the inner peripheral side constitutes at least a part of a holding portion that holds the camera module in a swingable manner. An optical device for photographing. The shake correction coil is formed by being wound with the optical axis direction as the winding axial direction,
The core member is formed in a straight column shape or a flat plate shape,
The facing portion is one end surface of the core member in the optical axis direction,
2. The photographing optical apparatus according to claim 1, wherein the magnetic plate and the facing portion are opposed to each other in the optical axis direction.   3. The photographing optical device according to claim 2, wherein the swing mechanism includes a second magnetic plate formed of a soft magnetic material and in contact with the other end surface of the core member in the optical axis direction. The photographing optical device is formed so that the shape when viewed from the optical axis direction is a substantially square shape,
When viewed from the optical axis direction, the fulcrum portion is disposed at substantially the center of the photographing optical device, and the four shake correction coils in which the core member is disposed on the inner peripheral side include the photographing portion. 4. The photographing optical device according to claim 2, wherein the photographing optical device is disposed at each of four corners of the optical device for photographing. The shake correction coil is formed by being wound with a direction orthogonal to the optical axis direction as a winding axial direction,
2. The photographing optical device according to claim 1, wherein when viewed in the optical axis direction, the plurality of shake correction coils are arranged radially about the fulcrum portion. The core member is formed in a substantially rectangular flat plate shape or a straight column shape in which the axial direction of winding of the shake correction coil is a longitudinal direction,
When the end surface on the fulcrum part side of the core member is an inner end surface, and the end surface opposite to the inner end surface is an outer end surface,
The outer end surface is the facing portion,
The magnetic plate is formed such that a magnetic plate side facing portion facing the facing portion protrudes in the optical axis direction,
6. The photographing optical apparatus according to claim 5, wherein the facing portion and the magnetic plate side facing portion face each other in the axial direction of winding of the shake correction coil. The core member includes a first core portion formed in a substantially rectangular flat plate shape or a straight column shape whose longitudinal direction is the winding axial direction of the shake correction coil, and the fulcrum portion of the first core member. When the end face on the side is the inner end face, and the end face opposite to the inner end face is the outer end face, a protrusion projecting in the optical axis direction from the outer end face is provided,
The front end surface of the protruding portion is the facing portion,
6. The photographing optical apparatus according to claim 5, wherein the facing portion and the magnetic plate are opposed to each other in the optical axis direction. The shake correction mechanism includes a fulcrum member having the fulcrum portion and formed of a soft magnetic material,
The swing mechanism includes a third magnetic plate formed of a soft magnetic material and in contact with the inner end surface,
8. The photographing optical apparatus according to claim 6, wherein the fulcrum member is in contact with the third magnetic plate and is in contact with the magnetic plate. The swing mechanism includes a coil holding member that holds the plurality of shake correction coils,
9. The photographing optical device according to claim 5, wherein the coil holding member is formed so that a placement concave portion in which the shake correction coil is disposed is recessed in the optical axis direction. . The shake correction mechanism includes a fulcrum member having the fulcrum part,
The swing mechanism includes a coil holding member that holds the shake correction coil,
10. The photographing optical apparatus according to claim 1, wherein the fulcrum member is fixed to the coil holding member or the magnetic plate.   11. The photographing optical device according to claim 1, wherein a surface of the shake correction coil is covered with an insulating film. The swing mechanism includes a coil holding member that holds the shake correction coil,
The shake correction mechanism includes: a first fixing portion that is fixed to the coil holding member; a second fixing portion that is fixed to the magnetic plate; and an arm portion that connects the first fixing portion and the second fixing portion. A spring member having
The spring member is disposed between the coil holding member and the magnetic plate,
The photographing optical device according to claim 1, wherein the camera module can swing when the arm portion is bent.

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