JP2015034856A - Image capturing optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image capturing optical device which is capable of driving movement of a moveable body in an optical axis direction and swing movement of a moveable module having the moveable body and a holding body using common driving magnets and yet secures fixation strength of the driving magnets to the moveable module.SOLUTION: An image capturing optical device 1 includes a moveable module 4 having a movable body 8 and a holding body 9 which holds the moveable body 8 in a manner that allows movement in an optical axial direction, and a support body 5 which swingably holds the moveable module 4. The holding body 9 has a cylindrical portion 14b which constitutes an outer periphery of the moveable module 4 made of a nonmagnetic material, and the driving magnets 38 are fixed to an inner periphery of the cylindrical portion 14b. The image capturing optical device 1 has lens driving coils 32 which are mounted on the moveable body 8 to face the driving magnets 38 from the inner peripheral side, and shake-correction coils 33 which are mounted on the support body 5 to face the driving magnets 38 from the outer peripheral side with the cylindrical portion 14b in between.

Description

  The present invention relates to a photographing optical apparatus having a shake correction function for correcting shake by swinging a movable module on which a lens and an image sensor are mounted.

  2. Description of the Related Art Conventionally, there has been known a photographing optical apparatus having a shake correction function for correcting shake by swinging a movable module on which a lens and an image sensor are mounted (see, for example, Patent Document 1). The photographic optical device described in Patent Document 1 includes a movable module on which a lens and an image sensor are mounted, and a support that supports the movable module so as to be swingable. In this photographing optical device, the movable module includes a movable body that holds the lens and is movable in the optical axis direction of the lens, and a holding body that holds the movable body so as to be movable in the optical axis direction.

  In addition, the photographing optical device described in Patent Document 1 includes a lens driving coil attached to a movable body, a shake correction coil attached to a support, and four driving magnets. The inner surface of the driving magnet in the direction orthogonal to the optical axis direction faces the lens driving coil, and the outer surface of the driving magnet in the direction orthogonal to the optical axis direction faces the shake correction coil. The holding body includes a cover member that constitutes a part of the outer peripheral surface of the movable module. The cover member is formed of a nonmagnetic material and is formed in a substantially bottomed rectangular tube shape having a bottom portion and a tube portion. Fixing holes penetrating the side surfaces are formed on the four side surfaces constituting the cylindrical portion, and a driving magnet is fixed to the fixing holes.

JP 2011-203476 A

  As described above, in the photographing optical device described in Patent Document 1, the driving magnet is fixed to the fixing hole of the cover member. However, the thickness of the cylindrical portion in which the fixing hole is formed depends on the driving magnet. It is significantly thinner than the thickness. Therefore, in this photographing optical device, it may be difficult to ensure the fixing strength of the driving magnet with respect to the cover member. That is, in this photographing optical device, it may be difficult to ensure the fixing strength of the driving magnet with respect to the movable module. If the fixing strength of the driving magnet with respect to the movable module cannot be ensured, the driving magnet may come off the movable module when the photographing optical device receives an impact such as dropping.

  Therefore, the problem of the present invention is that even if the movement of the movable body in the optical axis direction and the swing of the movable module having the movable body and the holding body can be performed using a common drive magnet, An object of the present invention is to provide an imaging optical device capable of securing the fixing strength of a driving magnet to a movable module.

  In order to solve the above problems, a photographing optical device according to the present invention includes a movable body that holds a lens and is movable in the optical axis direction of the lens, and a movable body that holds the movable body so as to be movable in the optical axis direction. A module, a support that holds the movable module in a swingable manner, a lens drive coil that is attached to the movable body, a shake correction coil that is attached to the support, and a drive magnet that is attached to the support. The holding body includes a cylindrical portion that is formed in a cylindrical shape and forms an outer peripheral surface of the movable module and is disposed so as to cover the outer peripheral side of the movable body. The cylindrical portion is formed of a nonmagnetic material, and the driving magnet is The lens driving coil is fixed to the inner peripheral surface of the cylindrical portion, the lens driving coil faces the driving magnet from the inner peripheral side, and the shake correction coil faces the driving magnet from the outer peripheral side through the cylindrical portion. It is characterized by that.

  In the photographic optical device of the present invention, the lens driving coil faces the driving magnet from the inner peripheral side, so the movable body is moved in the optical axis direction using the lens driving coil and the driving magnet. It becomes possible to make it. In the present invention, the driving magnet is fixed to the inner peripheral surface of the cylindrical portion. However, since the cylindrical portion is formed of a nonmagnetic material, the lines of magnetic force generated by the driving magnet are passed through the cylindrical portion. It passes through a shake correction coil facing the drive magnet from the outer peripheral side. Therefore, in the present invention, the movable module can be swung using the shake correction coil and the drive magnet.

  In the present invention, since the driving magnet is fixed to the inner peripheral surface of the cylindrical portion, the contact area between the cylindrical portion and the driving magnet is increased, and the driving magnet to the cylindrical portion constituting the holding body is increased. It becomes possible to secure the fixed strength. That is, according to the present invention, it is possible to ensure the fixing strength of the driving magnet to the movable module. Therefore, in the present invention, even if it is possible to move the movable body in the optical axis direction and swing the movable module having the movable body and the holding body using a common driving magnet, the movable module It becomes possible to secure the fixing strength of the driving magnet to the.

  In the present invention, for example, the support includes an outer cylindrical portion that is formed in a cylindrical shape and is disposed so as to cover the outer peripheral side of the movable module, and the cylindrical portion and the outer cylindrical portion are viewed from the optical axis direction. Is formed in a substantially square cylindrical shape that is a substantially square frame shape or a substantially rectangular frame shape, and the lens driving coils are wound and fixed around the outer peripheral surface of the movable body to form four cylindrical portions. A driving magnet formed in a substantially rectangular flat plate shape is fixed to each inner side surface of the side surface portion of each of the four side surface portions, and shake correction is performed on each inner side surface of the four outer peripheral side portions constituting the outer peripheral side cylindrical portion. The coil for use is fixed.

  In the present invention, the imaging optical device includes a spring member that connects the movable module and the support, and the spring member includes a movable-side fixed portion that is fixed to the movable module, and a fixed-side fixed portion that is fixed to the support. The movable side fixed portion and the arm portion connecting the fixed side fixed portion, and when the one side in the optical axis direction is the subject side and the other side in the optical axis direction is the anti-subject side, the spring member is It is preferable that the movable module is connected to the support on the object side, and the movable module is biased with respect to the support in the optical axis direction and the direction orthogonal to the optical axis direction. With this configuration, for example, in the state where the optical axis direction coincides with the horizontal direction (that is, in the state where the optical axis direction is orthogonal to the direction of gravity (gravity direction)), the imaging optical device is used. Even if it exists, it becomes possible to make small the inclination amount by the side of the subject of the movable module with respect to a support body. Therefore, even when the photographing optical device is used in a state where the optical axis direction is orthogonal to the direction of gravity, it is possible to improve the quality of an image photographed by the photographing optical device.

  In the present invention, the photographing optical device includes four spring members, and the spring members are wire springs formed by bending a linear member into a substantially L shape, and are arranged on the outer peripheral side of the cylindrical portion. It is preferable that the bent portions of the spring member that is disposed on the inner peripheral side with respect to the outer peripheral side cylindrical portion and is formed in a substantially L shape are disposed at each of the four corners of the cylindrical portion and the outer peripheral side cylindrical portion. If comprised in this way, since a cylinder part, an outer side cylinder part, and a spring member do not overlap in an optical axis direction, it becomes possible to reduce in size an optical apparatus for imaging | photography in an optical axis direction. Also, since the spring member is a wire spring formed by bending the spring member into a substantially L shape, the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the outer peripheral side cylindrical portion is reduced. Also, it becomes possible to dispose a spring member. Therefore, 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 holding body includes a substantially rectangular frame-shaped spring fixing member fixed to the outer peripheral surface of the cylindrical portion, and the spring fixing member is formed with a fixing hole for fixing the movable side fixing portion. It is preferable that a slit-like notch portion to which the fixed side fixing portion is fixed is formed at the subject side end of the cylindrical portion. If comprised in this way, it will become possible to arrange | position a spring member accurately and easily using a fixing hole and a notch part. Also, with this configuration, it is possible to adjust the fixing position of the spring fixing member configured separately from the cylindrical portion with respect to the cylindrical portion, and thus it is possible to adjust the biasing force of the spring member.

  In the present invention, for example, the four spring members are fixed to the outer side surfaces of the four side surfaces and are arranged on the outer peripheral side of the fixed side fixing portion and the fixed side fixing portion. The leaf spring may include a movable side fixed portion and four arm portions extending from the fixed side fixed portion toward the outer peripheral side.

  In the present invention, for example, the holding body includes an end surface portion that constitutes an end surface on the subject side of the movable module, the end surface portion is formed with a through-hole penetrating in the optical axis direction, and the spring member is annularly formed. The fixed side fixing portion to be formed, four movable side fixing portions that are arranged on the inner peripheral side than the fixed side fixing portion and are fixed to the through hole, and extend from the fixed side fixing portion toward the inner peripheral side A leaf spring including four arm portions may be used.

  Further, in the present invention, the photographing optical device is disposed on the outer peripheral side of the cylindrical part and on the inner peripheral side of the outer peripheral side cylindrical part, and is disposed on a diagonal line among the four corners of the cylindrical part and the outer peripheral side cylindrical part. Provided with two spring members disposed at each of the two corner portions, the holding body includes an end surface portion constituting an end surface on the subject side of the movable module, and the spring member is formed in a substantially L shape. A fixed-side fixed portion fixed to the inner surface of two corners arranged on the diagonal line of the four corners of the outer peripheral side cylindrical portion, and two movable-side fixed fixed to the subject side surface of the end surface portion A leaf spring including a portion and two arm portions may be used.

  In the present invention, if one side in the optical axis direction is the subject side and the other side in the optical axis direction is the non-subject side, the photographing optical device is attached to the subject side of the movable module, for example, The other end is attached to the non-subject side of the support, and includes four tension coil springs that urge the movable module toward the anti-subject side, and each of the four tension coil springs has four corners of the cylindrical portion and the outer peripheral side cylindrical portion. Are arranged in each.

  In the present invention, if one side in the optical axis direction is the subject side and the other side in the optical axis direction is the non-subject side, the photographic optical device is disposed on the anti-subject side of the photographic optical device, and the movable module The four compression coil springs may be disposed at substantially the center positions of the four sides of the cylindrical portion when viewed from the optical axis direction.

  As described above, in the photographing optical device of the present invention, the movement of the movable body in the optical axis direction and the swing of the movable module having the movable body and the holding body can be performed using a common drive magnet. Even if it is possible, it becomes possible to secure the fixing strength of the driving magnet to the movable module.

1 is a perspective view of a photographic optical device according to an embodiment of the present invention. It is sectional drawing of the EE cross section of FIG. It is a disassembled perspective view of the optical device for imaging shown in FIG. FIG. 4 is an exploded perspective view of the movable module shown in FIG. 3. FIG. 3 is a diagram illustrating a cover member, a lens driving coil, a shake correction coil, and a driving magnet shown in FIG. 2 from the opposite object side. FIG. 4 is an enlarged view of a wire spring and a spring fixing member shown in FIG. 3. FIG. 3 is a perspective view showing a wire spring, a cover member, a spring fixing member, and a case body shown in FIG. 2 from the subject side. It is a perspective view for demonstrating the spring member concerning other embodiment of this invention. It is a perspective view for demonstrating the spring member concerning other embodiment of this invention.

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

(Overall configuration of optical device for photographing)
FIG. 1 is a perspective view of a photographing optical apparatus 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the photographing optical device 1 shown in FIG. FIG. 4 is an exploded perspective view of the movable module 4 shown in FIG. In the following description, as shown in FIG. 1 and the like, the three directions orthogonal to each other are defined as 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. And Further, the Z1 direction side in FIG. 1 and the like 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. The four side surfaces are a plane composed of a left-right direction and an up-down direction (that is, a ZX plane composed of a Z direction and an X direction) or a plane composed of a front-rear direction and an up-down direction (that is, a Y direction). And the YZ plane formed by the Z direction).

  The photographing optical device 1 includes a movable module 4 on which a photographing lens and an image sensor are mounted, and a support 5 that holds the movable module 4 so as to be swingable. The movable module 4 is connected to the support 5 by four wire springs 6 as spring members. In this embodiment, the vertical direction substantially coincides with the optical axis direction of the movable module 4 when the movable module 4 is not swinging. In this embodiment, an imaging device is mounted on the lower end of the movable module 4 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) that is one side in the optical axis direction, and the lower side (Z2 direction side) is the opposite side that is the other side in the optical axis direction. Side (image sensor side, image side).

  The movable module 4 is formed in a substantially quadrangular prism shape as a whole. In this embodiment, the movable module 4 is formed so that the shape when viewed from the optical axis direction is a substantially square shape. The movable module 4 includes a movable body 8 that holds a lens and is movable in the optical axis direction, and a holding body 9 that holds the movable body 8 so as to be movable in the optical axis direction. The movable body 8 includes a leaf spring 10 that connects the movable body 8 and the holding body 9 on the upper end side of the movable body 8, and a leaf spring 11 that connects the movable body 8 and the holding body 9 on the lower end side of the movable body 8. The holding body 9 is movably held.

  The movable body 8 includes a lens holder 12 to which a plurality of lenses are fixed, and a sleeve 13 that holds the lens holder 12. The holding body 9 includes a cover member 14 that forms four front, back, left, and right side surfaces of the movable module 4, a base member 16 that forms a lower end side portion (anti-subject side portion) of the movable module 4, and a part of the leaf spring 10. Is provided with a spacer 17 and a spring fixing member 18 to which a part of the wire spring 6 is fixed. In FIGS. 3 and 4, the lens holder 12 is not shown.

  The lens holder 12 is formed in a substantially cylindrical shape. A plurality of lenses are fixed on the inner peripheral side of the lens holder 12. The sleeve 13 is formed in a substantially cylindrical shape. Specifically, the sleeve 13 has a substantially cylindrical shape in which the inner periphery of the sleeve 13 is circular when viewed from the optical axis direction, and the outer periphery of the sleeve 13 is substantially rectangular when viewed from the optical axis direction. Is formed. The sleeve 13 holds the lens holder 12 on its inner peripheral side. That is, the outer peripheral surface of the lens holder 12 is fixed to the inner peripheral surface of the sleeve 13.

  The cover member 14 is made of a nonmagnetic material. For example, the cover member 14 is formed of a nonmagnetic metal material or resin material. The cover member 14 is formed in a substantially bottomed rectangular tube shape having a bottom portion 14a and a tube portion 14b. The bottom portion 14a is disposed on the upper side and constitutes the upper end surface (end surface on the subject side) of the movable module 4. A through hole 14c penetrating in the vertical direction is formed at the center of the bottom portion 14a. The bottom portion 14 a covers a part of the upper end side of the movable body 8. The bottom portion 14a of this embodiment is an end surface portion that constitutes an end surface on the subject side of the movable module 4.

  The cylinder part 14b is formed in the cylinder shape. Specifically, the cylindrical portion 14b is formed in a substantially square cylindrical shape having a substantially square frame shape when viewed from the optical axis direction, and includes two side surface portions 14d orthogonal to the front-rear direction and the left and right sides. It is comprised by the four side parts 14d with the two side parts 14d orthogonal to a direction. The cylindrical portion 14 b covers the outer peripheral side of the movable body 8. Moreover, the cylinder part 14b comprises four side surfaces (outer peripheral surfaces) of front, rear, left and right of the movable module 4.

  The base member 16 is formed in a flat and substantially rectangular parallelepiped shape, and the outer shape of the base member 16 when viewed from the optical axis direction is a substantially square shape. In this embodiment, a through hole 16a is formed at the center of the base member 16, and the base member 16 is formed so that the shape when viewed from the optical axis direction is a substantially square frame. The base member 16 is attached to the lower end side of the cover member 14.

  The spacer 17 is formed in a substantially square flat block shape. The spacer 17 is formed in a frame shape, and a through hole is formed at the center thereof. The spacer 17 is fixed to the lower surface of the bottom portion 14 a of the cover member 14. The spring fixing member 18 is formed in a substantially square frame shape. The detailed configuration of the spring fixing member 18 will be described later.

  The leaf spring 10 has four movable body fixing portions fixed to the upper end side of the sleeve 13, four fixed body fixing portions fixed to the spacer 17, and four connecting the movable body fixing portion and the fixed body fixing portion. Arm. The leaf spring 10 is fixed to the sleeve 13 and the spacer 17 so that the thickness direction and the vertical direction substantially coincide with each other. As shown in FIG. 4, the leaf spring 11 is composed of two spring pieces 20. The two spring pieces 20 connect the movable body fixing portion fixed to the lower end side of the sleeve 13, the two fixed body fixing portions fixed to the base member 16, and the movable body fixing portion and the fixed body fixing portion. Arm. The leaf spring 11 is fixed to the sleeve 13 and the base member 16 so that the thickness direction and the vertical direction substantially coincide with each other.

  The image sensor is mounted on the substrate 21. The substrate 21 is fixed to the lower surface of the base member 16. An FPC (flexible printed circuit board) 22 is connected to the lower surface of the substrate 21. A substantially flat fulcrum member 23 is fixed to the lower surface of the FPC 22. At the center of the fulcrum member 23, a fulcrum part 23a serving as a fulcrum for swinging the movable module 4 is formed so as to protrude downward. The fulcrum portion 23 a is in contact with the upper surface of a base plate 26 described later that constitutes the support 5.

  The support 5 includes a case body 25 that forms four front, back, left, and right side surfaces of the support 5, and a base plate 26 that forms the lower end surface of the support 5. In this embodiment, the case body 25 constitutes four front and rear side surfaces of the photographing optical device 1, and the base plate 26 constitutes a lower end surface of the photographing optical device 1. Further, the support body 5 includes a spring cover 27 fixed to the upper end of the case body 25.

  The case body 25 is made of, for example, a nonmagnetic metal material. Further, the case body 25 is formed in a substantially rectangular tube shape. Specifically, the case body 25 is formed in a substantially square tube shape having a substantially square frame shape when viewed from the optical axis direction, and includes two side surface portions 25a orthogonal to the front-rear direction and the left and right sides. It is comprised by the four side parts 25a with the two side parts 25a orthogonal to a direction. The case body 25 is disposed so as to cover the outer peripheral side of the movable module 4 and the outer peripheral side of the lens driving mechanism 30 and the shake correction mechanism 31 described later. The case body 25 of the present embodiment is an outer peripheral side cylindrical portion that is formed in a cylindrical shape and is disposed so as to cover the outer peripheral side of the movable module 4. Moreover, the side part 25a of this form is an outer peripheral side part.

  A slit-shaped cutout portion 25b is formed on the side surface portion 25a. The cutout portion 25b is formed so as to be cut out from the upper end of the side surface portion 25a toward the lower side. Further, in the two side surface portions 25a orthogonal to the front-rear direction, a notch portion 25b is formed at an intermediate position in the left-right direction, and in the two side surface portions 25a orthogonal to the left-right direction, a notch is formed in the intermediate position in the front-back direction A portion 25b is formed. A fixed side fixing portion 6b, which will be described later, constituting the wire spring 6 is fixed to the notch portion 25b.

  The base plate 26 is formed in a substantially square flat plate shape. At the center of the base plate 26, a guide portion 26a for preventing the fulcrum portion 23a from shifting in the front-rear and left-right directions is formed. The guide part 26a is formed in an annular shape protruding upward. The fulcrum part 23a is arranged on the inner peripheral side of the guide part 26a. Further, the fulcrum part 23 a is in contact with the upper surface of the base plate 26.

  The spring cover 27 is formed in a substantially square frame shape. The spring cover 27 is fixed to the upper end of the case body 25 as described above. As will be described later, the spring cover 27 is disposed between the cylindrical portion 14b of the cover member 14 and the case body 25 in the front-rear and left-right directions and covers the wire spring 6 disposed on the upper end side of the movable module 4 from above. Yes.

  In addition, the photographing optical device 1 includes a lens driving mechanism 30 for driving the movable body 8 in the optical axis direction with respect to the holding body 9, and the movable module 4 with respect to the support body 5 by swinging the movable module 4. A shake correction mechanism 31 for correcting shake is provided. Hereinafter, the configurations of the lens driving mechanism 30 and the shake correction mechanism 31 will be described.

(Configuration of lens drive mechanism and shake correction mechanism)
FIG. 5 is a view showing the cover member 14, the lens driving coil 32, the shake correction coil 33, and the driving magnet 38 shown in FIG.

  Two lens driving coils 32 constituting the lens driving mechanism 30 are attached to the outer peripheral surface of the sleeve 13. The lens driving coil 32 is wound along the outer peripheral surface of the sleeve 13. That is, the lens driving coil 32 is wound and fixed around the outer peripheral surface of the movable body 8. The two lens driving coils 32 are wound so that their winding directions are different from each other. The two lens driving coils 32 are fixed to the outer peripheral surface of the sleeve 13 with a predetermined interval in the vertical direction.

  A shake correction coil 33 constituting the shake correction mechanism 31 is fixed to the inner side surface of each of the four side face portions 25 a constituting the case body 25. The shake correction coil 33 is an air-core coil and is formed in a substantially oval flat plate shape. Note that the shake correction coil 33 may be an FP coil configured by forming a coil portion made of fine copper wiring on a printed circuit board.

  The shake correction coil 33 formed in a substantially oval flat plate shape is fixed to the inner side surface of the side surface portion 25a by bonding or the like so that the long side portions thereof overlap in the vertical direction. Further, the shake correction coil 33 fixed to the inner side surface of the side surface portion 25a orthogonal to the front-rear direction is fixed so that the thickness direction and the front-rear direction substantially coincide with each other. The shake correction coil 33 fixed to the inner surface is fixed so that the thickness direction and the left-right direction substantially coincide.

  A driving magnet 38 formed in a substantially rectangular flat plate shape is fixed to each inner side surface of the four side surface portions 14d constituting the cylindrical portion 14b of the cover member 14. That is, four drive magnets 38 are fixed to the inner peripheral surface of the cylindrical portion 14b. The driving magnet 38 fixed to the inner surface of the side surface portion 14d orthogonal to the front-rear direction is fixed so that the thickness direction and the front-rear direction substantially coincide with each other, and is attached to the inner surface of the side surface portion 14d orthogonal to the left-right direction. The driving magnet 38 to be fixed is fixed so that the thickness direction thereof substantially coincides with the left-right direction. Further, the drive magnet 38 formed in a substantially rectangular flat plate shape is fixed to the inner side surface of the side surface portion 14d by bonding or the like so that the short side direction thereof coincides with the vertical direction.

  The driving magnet 38 is a neodymium magnet mainly composed of neodymium, iron, and boron. The driving magnet 38 is composed of two magnet pieces, a first magnet piece 38a and a second magnet piece 38b, which are formed in a substantially rectangular flat plate shape. Specifically, the first magnet piece 38a and the second magnet piece 38b are bonded and fixed to each other while the lower surface of the first magnet piece 38a and the upper surface of the second magnet piece 38b are in contact with each other. A magnet 38 is formed.

  The drive magnet 38 is magnetized so that the magnetic pole formed on one side surface is different from the magnetic pole formed on the other side surface. That is, the drive magnet 38 arranged so that the thickness direction thereof substantially coincides with the front-rear direction is worn so that the magnetic pole formed on the front side surface of the drive magnet 38 and the magnetic pole formed on the rear side surface are different. It is magnetized. Further, the driving magnet 38 arranged so that the thickness direction thereof substantially coincides with the left-right direction is worn so that the magnetic pole formed on the right side surface of the driving magnet 38 is different from the magnetic pole formed on the left side surface. It is magnetized.

  The drive magnet 38 is magnetized so that two different magnetic poles overlap in the vertical direction on the side surface. Specifically, the drive magnet 38 disposed so that the thickness direction thereof substantially coincides with the front-rear direction includes a magnetic pole formed on the outer surface of the first magnet piece 38a in the front-rear direction and the second magnet piece 38b. The magnetic poles formed on the outer surface are different (that is, the magnetic poles formed on the inner surface of the first magnet piece 38a and the magnetic poles formed on the inner surface of the second magnet piece 38b in the front-rear direction are different). ) The driving magnet 38 that is magnetized and arranged so that the thickness direction thereof substantially coincides with the left-right direction has a magnetic pole formed on the outer surface of the first magnet piece 38a in the left-right direction and the second magnet piece 38b. The magnetic poles formed on the outer surface are different (that is, the magnetic poles formed on the inner surface of the first magnet piece 38a and the magnetic poles formed on the inner surface of the second magnet piece 38b in the left-right direction are different). ) Magnetized.

  In this embodiment, the magnetic poles on the inner side surfaces of the four first magnet pieces 38a are all the same magnetic pole (that is, the magnetic poles on the inner side surfaces of the four second magnet pieces 38b are all the same magnetic pole). A number of drive magnets 38 are arranged. That is, in this embodiment, the magnetic poles on the outer surface of the four first magnet pieces 38a are all the same magnetic pole (that is, the magnetic poles on the outer surface of the four second magnet pieces 38b are all the same magnetic pole). Four drive magnets 38 are arranged.

  The inner surface of the first magnet piece 38a in the front-rear direction or the left-right direction opposes the outer peripheral surface of one of the two lens drive coils 32 with a predetermined gap, The inner surface of the second magnet piece 38b in the left-right direction is opposed to the outer peripheral surface of the other lens driving coil 32 with a predetermined gap. That is, the lens driving coil 32 faces the driving magnet 38 from the inner peripheral side, as shown in FIG.

  The outer side surface of the first magnet piece 38a in the front-rear direction or the left-right direction opposes one long side portion of the two long side portions of the shake correction coil 33 via the side surface portion 14d and a predetermined gap. The outer side surface of the second magnet piece 38b in the front-rear direction or the left-right direction is opposed to the other long side portion of the two long side portions of the shake correction coil 33 via the side surface portion 14d and a predetermined gap. doing. In other words, the shake correction coil 33 faces the drive magnet 38 from the outer peripheral side via the cylindrical portion 14b.

  In this embodiment, the lens driving mechanism 30 is configured by the lens driving coil 32 and the driving magnet 38. When a current is supplied to the lens driving coil 32, the lens together with the movable body 8 moves in the optical axis direction. Moving. Further, as described above, since the cover member 14 is made of a nonmagnetic material, the magnetic lines of force generated by the driving magnet 38 pass through the cylindrical portion 14b and are driven from the outer peripheral side via the cylindrical portion 14b. Passes through a shake correction coil 33 facing the magnet 38. In this embodiment, the shake correction mechanism 31 is configured by the shake correction coil 33 and the drive magnet 38. When a change in the tilt of the photographic optical device 1 is detected by the gyroscope disposed outside the photographic optical device 1, a current is supplied to the shake correction coil 33 based on the detection result of the gyroscope. . When a current is supplied to the shake correction coil 33, the movable module 4 swings so that the optical axis L is tilted about the fulcrum portion 23a, thereby correcting the shake.

(Configuration of wire spring and spring fixing member)
FIG. 6 is an enlarged view of the wire spring 6 and the spring fixing member 18 shown in FIG. FIG. 7 is a perspective view showing the wire spring 6, the cover member 14, the spring fixing member 18, and the case body 25 shown in FIG. 2 from the subject side.

  The wire spring 6 is formed by bending a linear member into a substantially L shape. For example, the wire spring 6 is formed by bending a metal wire into a substantially L shape. One end side of the wire spring 6 extends straight as it is. One end side of the wire spring 6 is a movable side fixing portion 6 a that is fixed to the movable module 4. On the other end side of the wire spring 6, a bent portion that is bent in a substantially ¼ arc shape is formed. This bent portion is a fixed-side fixing portion 6 b that is fixed to the support 5. The portion of the wire spring 6 between the movable side fixed portion 6a and the fixed side fixed portion 6b is an arm portion 6c that connects the movable side fixed portion 6a and the fixed side fixed portion 6b. It is formed in a substantially L shape. In addition, although the cross-sectional shape of the wire spring 6 of this form is a rectangular shape, the cross-sectional shape of the wire spring 6 may be a square shape or a circular shape. Further, the cross-sectional shape of the wire spring 6 may be a polygonal shape other than a rectangular shape or may be an elliptical shape.

  The spring fixing member 18 is formed in a substantially square frame shape as described above. The spring fixing member 18 of this embodiment is formed so as to have a substantially square frame shape when viewed from the optical axis direction, and is configured by four side portions 18a formed in a linear shape. . The spring fixing member 18 is fixed to the outer peripheral surface on the upper end side of the cylindrical portion 14 b of the cover member 14. The size of the inner peripheral end of the spring fixing member 18 is substantially equal to the size of the outer peripheral surface of the cylindrical portion 14b, and the inner peripheral end of the spring fixing member 18 is in contact with the outer peripheral surface of the cylindrical portion 14b. A spring fixing portion 18b to which the movable side fixing portion 6a of the wire spring 6 is fixed is formed at the center of the side portion 18a. The upper surface of the spring fixing portion 18b is formed in a planar shape orthogonal to the vertical direction.

  As shown in FIG. 7, the movable side fixing portion 6a of the wire spring 6 is fixed to the upper surface of the spring fixing portion 18b by bonding or the like while being placed on the upper surface of the spring fixing portion 18b. The fixed side fixing portion 6b of the wire spring 6 is fixed to the notch portion 25b by bonding or the like while being inserted into the notch portion 25b of the case body 25. As described above, the wire spring 6 connects the movable module 4 and the support 5 on the upper end side (subject side) of the movable module 4, and is disposed on the upper end side of the movable module 4. Further, the wire spring 6 is disposed on the outer peripheral side with respect to the cylindrical portion 14 b and on the inner peripheral side with respect to the case body 25. That is, the wire spring 6 is disposed between the cylindrical portion 14b and the case body 25 in the front-rear and left-right directions. Further, the bent portions of the wire spring 6 formed in a substantially L shape (that is, the bent portions of the arm portion 6 c) are disposed at the four corners of the cylindrical portion 14 b and the case body 25, respectively.

  The wire spring 6 urges the movable module 4 in the up and down direction (optical axis direction) and the front and rear left and right direction (direction orthogonal to the optical axis direction) with respect to the support 5 by an arm portion 6c formed in a substantially L shape. doing. In this embodiment, the wire spring 6 is applied with a biasing force for biasing the movable module 4 downward so as to generate a pressure for reliably contacting the fulcrum 23a and the upper surface of the base plate 26. It is fixed in a bent state.

(Main effects of this form)
As described above, in this embodiment, the movable body 8 can be moved in the optical axis direction by the lens driving mechanism 30 including the lens driving coil 32 and the driving magnet 38. Further, in this embodiment, the cover member 14 is made of a nonmagnetic material, and the line of magnetic force generated by the driving magnet 38 has the vibration correction coil 33 that faces the driving magnet 38 from the outer peripheral side via the cylindrical portion 14b. Therefore, the movable module 4 can be swung by the shake correction mechanism 31 including the shake correction coil 33 and the drive magnet 38. In this embodiment, since the driving magnet 38 is fixed to the inner peripheral surface of the cylinder portion 14b, the contact area between the cylinder portion 14b and the driving magnet 38 is increased, and the driving magnet to the cover member 14 is increased. It is possible to ensure a fixed strength of 38. That is, in this embodiment, it is possible to ensure the fixing strength of the driving magnet 38 to the movable module 4. Therefore, in this embodiment, even if the movement of the movable body 8 in the optical axis direction and the swinging of the movable module 4 can be performed using the common drive magnet 38, the drive for the movable module 4 can be performed. It becomes possible to ensure the fixing strength of the magnet 38.

  In this embodiment, the wire spring 6 connects the movable module 4 and the support 5 on the object side of the movable module 4, and biases the movable module 4 in the vertical direction and the front-rear and left-right directions with respect to the support 5. ing. Therefore, in this embodiment, even when the optical apparatus for photographing 1 is used in a state where the optical axis direction coincides with the horizontal direction (that is, in a state where the optical axis direction is orthogonal to the gravity direction), the support body The amount of inclination of the movable module 4 on the subject side with respect to 5 can be reduced. Therefore, in this embodiment, even when the photographing optical device 1 is used in a state where the optical axis direction is orthogonal to the gravity direction, it is possible to improve the quality of an image photographed by the photographing optical device 1. Become.

  In this embodiment, the wire spring 6 is disposed on the outer peripheral side of the cylindrical portion 14b of the cover member 14 and on the inner peripheral side of the case body 25, and overlaps the cylindrical portion 14b and the case body 25 in the optical axis direction. Not. Therefore, in this embodiment, it is possible to reduce the size of the photographic optical device 1 in the optical axis direction. Further, in this embodiment, the wire spring 6 is formed by being bent into a substantially L shape. Therefore, even if the gap between the outer peripheral surface of the cylindrical portion 14b and the inner peripheral surface of the case body 25 is reduced, the wire spring 6 is The spring 6 can be arranged. 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.

  In this embodiment, the spring fixing member 18 formed separately from the cover member 14 is fixed to the outer peripheral surface on the upper end side of the cylindrical portion 14b, and the movable side fixing portion 6a of the wire spring 6 is attached to the spring fixing member 18. It is fixed. Therefore, in this embodiment, it is possible to adjust the urging force in the optical axis direction of the wire spring 6 by adjusting the fixing position of the spring fixing member 18 with respect to the cylindrical portion 14b. In this embodiment, the case body 25 is formed with the notch 25b to which the fixed side fixing portion 6b of the wire spring 6 is fixed. Therefore, the fixed side fixing portion 6b can be easily and accurately attached to the case body. 25 can be fixed.

(Modification of wire spring and spring fixing member)
With the form mentioned above, the movable side fixing | fixed part 6a of the wire spring 6 is being fixed to the upper surface of the spring fixing | fixed part 18b in the state mounted in the upper surface of the spring fixing | fixed part 18b. In addition to this, for example, a fixing hole in which the movable side fixing portion of the wire spring 6 is inserted and fixed may be formed in the spring fixing member 18b. In this case, the fixing hole is formed so as to penetrate the spring fixing portion 18b in the vertical direction. Further, in this case, a bent portion that is bent at approximately 90 ° is formed on one end side of the wire spring 6, and this bent portion is a movable side fixed portion of the wire spring 6. In this case, the movable side fixing portion of the wire spring 6 can be accurately and easily fixed to the spring fixing member 18.

(Modification of spring member)
8 and 9 are perspective views for explaining a spring member according to another embodiment of the present invention.

  In the above-described form, the photographic optical device 1 includes the four wire springs 6 as spring members that connect the movable module 4 and the support 5. In addition to this, for example, the photographing optical device 1 may include a leaf spring 46 shown in FIG. 8A in place of the four wire springs 6. The leaf spring 46 includes an annular fixed side fixed portion 46b, four movable side fixed portions 46a disposed on the outer peripheral side of the fixed side fixed portion 46b, and a movable side fixed portion 46a and a fixed side fixed portion. And four arm portions 46c connecting the portion 46b. When the photographic optical device 1 includes the leaf spring 46, the photographic optical device 1 includes an end surface member (not shown) that constitutes the upper end surface of the photographic optical device 1, and this end surface member is The upper end of the case body 25 is fixed.

  The fixed-side fixing portion 46b is formed in an annular shape and is fixed to the lower surface of the end surface member. The four movable side fixing portions 46a are fixed to the outer side surfaces of the four side surface portions 14d of the cylindrical portion 14b. Further, the movable side fixing portion 46a is fixed to the upper end side of the side surface portion 14d and is fixed to a substantially center position of the side surface portion 14d in the front-rear and left-right directions. The arm portion 46c is formed to extend straight from the fixed side fixed portion 46b toward the outer peripheral side. The leaf spring 46 biases the movable module 4 in the up-down direction and the front-rear left-right direction with respect to the support 5.

  Further, the photographing optical device 1 may include a plate spring 56 shown in FIG. 8B instead of the four wire springs 6. The leaf spring 56 includes an annular fixed side fixed portion 56b, four movable side fixed portions 56a disposed on the inner peripheral side of the fixed side fixed portion 56b, the movable side fixed portion 56a, and the fixed side. Four arm portions 56c that connect the fixing portion 56b are provided. When the photographic optical device 1 includes the leaf spring 56, the photographic optical device 1 includes an end surface member that constitutes the upper end surface of the photographic optical device 1, and this end surface member is the case body 25. It is fixed at the top of the.

  The fixed side fixing portion 56b is formed in a quadrangular annular shape and is fixed to the lower surface of the end surface member. The four movable side fixing portions 56a are fixed to a through hole 14c formed in the bottom portion 14a of the cover member 14. Specifically, the four movable side fixing portions 56a are fixed at substantially the center position in the front-rear and left-right directions of the edge of the through hole 14c. The arm portion 56c is formed so as to extend straight from the fixed-side fixed portion 56b toward the inner peripheral side. The leaf spring 56 biases the movable module 4 in the up-down direction and the front-back, left-right direction with respect to the support 5.

  Furthermore, the photographic optical device 1 may include two leaf springs 66 shown in FIG. 8C instead of the four wire springs 6. The plate spring 66 is formed in a substantially L shape as a whole. The leaf spring 66 is disposed on the outer peripheral side of the cylindrical portion 14 b of the cover member 14 and on the inner peripheral side of the case body 25, and is disposed on diagonal lines among the four corners of the cylindrical portion 14 b and the case body 25. It is arranged at each of the two corners.

  The leaf spring 66 includes a fixed side fixing portion 66b formed in a substantially L shape, two movable side fixing portions 66a, and two arm portions 66c that connect the movable side fixing portion 66a and the fixed side fixing portion 66b. And. The fixed-side fixing portion 66b is fixed to the inner side surfaces of the two corner portions arranged on the diagonal line of the four corners of the case body 25. The movable side fixing portion 66 a is fixed to the upper surface of the bottom portion 14 a of the cover member 14. Specifically, the movable side fixing portion 66a is fixed at a substantially center position in the front-rear and left-right directions on the upper surface of the bottom portion 14a. The arm portion 66c is formed in a straight flat plate shape. The leaf spring 66 urges the movable module 4 in the up-down direction and the front-rear left-right direction with respect to the support 5.

  In the leaf springs 46, 56, even if one of the four arm portions 46c, 56c of the leaf springs 46, 56 is damaged, the entire leaf springs 46, 56 are removed. Need to be replaced. Further, in the leaf spring 66, even if one of the two arm portions 66c of the leaf spring 66 is damaged, it is necessary to replace the entire leaf spring 66. On the other hand, in the case of the wire spring 6, if the arm portion 6c is damaged, only one wire spring 6 needs to be replaced. Therefore, in the photographing optical device 1 having the above-described form, it is possible to reduce the replacement cost when the arm portion 6c is damaged.

  Further, the photographing optical device 1 may include four tension coil springs 71 shown in FIG. 9A instead of the four wire springs 6. The four tension coil springs 71 are disposed on the outer peripheral side with respect to the cylindrical portion 14 b of the cover member 14 and on the inner peripheral side with respect to the case body 25, and are disposed on each of the four corners of the cylindrical portion 14 b and the case body 25. . One end of the tension coil spring 71 is attached to the upper end side (subject side) of the movable module 4, and the other end of the tension coil spring 71 is attached to the lower end side (counter subject side) of the support 5. Specifically, one end of the tension coil spring 71 is attached to a spring fixing member 72 that is fixed to the upper end side of the cylindrical portion 14 b of the cover member 14, and the other end of the tension coil spring 71 is attached to the base plate 26. . The tension coil spring 71 biases the movable module 4 downward (on the opposite subject side).

  Further, the photographing optical device 1 may include four compression coil springs 75 shown in FIG. 9B instead of the four wire springs 6. In this case, a rectangular parallelepiped spring contact member 76 is fixed at a substantially central position in the front / rear / left / right direction of the outer peripheral surface of the base member 16, and the four compression coil springs 75 are provided on the lower surface of the spring contact member 76. And the upper surface of the base plate 26. That is, each of the four compression coil springs 75 is disposed at substantially the center position of each of the four sides of the cylindrical portion 14b of the cover member 14 when viewed from the optical axis direction. The compression coil spring 75 biases the movable module 4 upward (subject side). In the modification shown in FIGS. 8 and 9, the photographing optical device 1 does not include the spring fixing member 18.

(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 holding body 9 includes the spring fixing member 18, but the holding body 9 may not include the spring fixing member 18. In this case, the movable side fixing portion 6 a of the wire spring 6 is directly fixed to the cover member 14.

  In the embodiment described above, the side surface of the drive magnet 38 is magnetized so that two different magnetic poles overlap in the optical axis direction, but the side surface of the drive magnet 38 may be magnetized to a single pole. In this case, one lens driving coil 32 is fixed to the outer peripheral side of the sleeve 13. In the embodiment described above, the drive magnet 38 is constituted by the first magnet piece 38a and the second magnet piece 38b. However, the drive magnet 38 is configured so that two different magnetic poles overlap in the optical axis direction. You may be comprised by one magnet piece magnetized.

  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. In this case, the cylindrical portion 14b and the case body 25 of the cover member 14 are formed in, for example, a substantially square cylindrical shape having a substantially rectangular frame shape when viewed from the optical axis direction. 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. In this case, the cylindrical portion 14b and the case body 25 are formed in a shape corresponding to the outer shape of the photographing optical device 1.

DESCRIPTION OF SYMBOLS 1 Optical apparatus for imaging | photography 4 Movable module 5 Support body 6 Wire spring (spring member)
6a Movable side fixed portion 6b Fixed side fixed portion 6c Arm portion 8 Movable body 9 Holding body 14 Cover member 14a Bottom portion (end surface portion)
14b cylinder part 14c through-hole 14d side part 18 spring fixing member 25 case body (outer peripheral side cylinder part)
25a Side surface (outer peripheral surface)
25b Notch 32 Lens drive coil 33 Shake correction coil 38 Drive magnet 46, 56, 66 Leaf spring (spring member)
46a, 56a, 66a Movable side fixing part 46b, 56b, 66b Fixed side fixing part 46c, 56c, 66c Arm part 71 Tension coil spring 75 Compression coil spring L Optical axis Z Optical axis direction Z1 Subject side Z2 Opposite subject side

Claims (10)

A movable body that holds a lens and is movable in the optical axis direction of the lens, a movable module that has a holding body that holds the movable body so as to be movable in the optical axis direction, and a support that holds the movable module in a swingable manner A body, a lens driving coil attached to the movable body, a shake correction coil attached to the support, and a driving magnet attached to the holding body,
The holding body includes a cylindrical portion that is formed in a cylindrical shape and constitutes an outer peripheral surface of the movable module and is disposed so as to cover an outer peripheral side of the movable body;
The cylindrical portion is formed of a nonmagnetic material,
The driving magnet is fixed to the inner peripheral surface of the cylindrical portion,
The lens driving coil is opposed to the driving magnet from the inner peripheral side,
The photographing optical device according to claim 1, wherein the shake correction coil faces the driving magnet from the outer peripheral side through the cylindrical portion. The support is provided with an outer peripheral side cylindrical portion that is formed in a cylindrical shape and is arranged so as to cover the outer peripheral side of the movable module,
The cylindrical portion and the outer peripheral side cylindrical portion are formed in a substantially square cylindrical shape having a substantially square frame shape or a substantially rectangular frame shape when viewed from the optical axis direction,
The lens driving coil is wound and fixed around the outer peripheral surface of the movable body,
The driving magnets formed in a substantially rectangular flat plate shape are fixed to the inner side surfaces of the four side surface portions constituting the cylindrical portion,
2. The photographing optical device according to claim 1, wherein the shake correction coils are fixed to inner surfaces of the four outer peripheral side surfaces constituting the outer peripheral side cylindrical portion. A spring member connecting the movable module and the support;
The spring member includes a movable side fixed portion fixed to the movable module, a fixed side fixed portion fixed to the support, and an arm portion connecting the movable side fixed portion and the fixed side fixed portion. ,
When one side of the optical axis direction is the subject side and the other side of the optical axis direction is the anti-subject side,
The spring member connects the movable module and the support on the subject side of the movable module, and urges the movable module in the optical axis direction and the direction perpendicular to the optical axis direction with respect to the support. The photographing optical apparatus according to claim 2, wherein the photographing optical apparatus is provided. Comprising four spring members,
The spring member is a wire spring formed by bending a linear member into a substantially L shape, and is disposed on the outer peripheral side of the cylindrical portion and on the inner peripheral side of the outer peripheral side cylindrical portion,
4. The photographing optical device according to claim 3, wherein the bent portion of the spring member formed in a substantially L shape is disposed at each of the four corners of the cylindrical portion and the outer peripheral side cylindrical portion. The holding body includes a substantially square frame-shaped spring fixing member fixed to the outer peripheral surface of the cylindrical portion,
The spring fixing member is formed with a fixing hole for fixing the movable side fixing portion,
5. The optical apparatus for photographing according to claim 4, wherein a slit-like notch portion to which the fixed side fixing portion is fixed is formed at a subject side end of the outer peripheral side cylindrical portion.   The spring member is arranged in an annular shape on the fixed side fixing portion, and on the outer peripheral side of the fixed side fixing portion, and on the four side surfaces, the four fixed side surfaces are fixed. 4. The photographing optical device according to claim 3, wherein the photographing optical device is a leaf spring including a movable side fixing portion and four arm portions extending from the fixed side fixing portion toward an outer peripheral side. The holding body includes an end surface portion constituting an end surface on the subject side of the movable module,
A through-hole penetrating in the optical axis direction is formed in the end surface portion,
The spring member includes the fixed side fixing portion formed in an annular shape, the four movable side fixing portions that are disposed on the inner peripheral side of the fixed side fixing portion and are fixed to the through hole, 4. The photographing optical device according to claim 3, wherein the photographing optical device is a leaf spring including four arm portions extending from a fixed side fixing portion toward an inner peripheral side. The two corners arranged on the diagonal line of the four corners of the cylinder part and the outer cylinder part and arranged on the outer circumference side of the cylinder part and the inner circumference side of the outer cylinder part Two spring members disposed on each of the spring members;
The holding body includes an end surface portion constituting an end surface on the subject side of the movable module,
The spring member is formed in a substantially L shape, and is fixed to the inner side surface of the two corners arranged on the diagonal line of the four corners of the outer peripheral side cylinder part, and the end face part The photographing optical device according to claim 3, wherein the photographing optical device is a leaf spring including two movable side fixing portions fixed to a surface of the subject side and two arm portions. When one side of the optical axis direction is the subject side and the other side of the optical axis direction is the anti-subject side,
One end is attached to the subject side of the movable module, the other end is attached to the opposite subject side of the support, and includes four tension coil springs that bias the movable module toward the opposite subject side,
3. The photographing optical device according to claim 2, wherein each of the four tension coil springs is disposed at each of four corners of the cylindrical portion and the outer peripheral cylindrical portion. When one side of the optical axis direction is the subject side and the other side of the optical axis direction is the anti-subject side,
Four compression coil springs arranged on the opposite subject side of the photographing optical device and biasing the movable module toward the subject side,
3. The photographing optical device according to claim 2, wherein each of the four compression coil springs is disposed at a substantially central position of each of the four sides of the cylindrical portion when viewed from the optical axis direction.

Images