JP2010096803A - Optical device for photographing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device for photographing where a lens drive device on which a lens and an imaging device are mounted is rocked appropriately, and which attains size reduction and thinning, and suppresses the effects due to disturbances, including vibrations and impacts. <P>SOLUTION: The optical device for photographing 1, having a camera shake correcting function that rocks the lens drive device 2 so as to correct camera shake includes: a rocking drive mechanism 6 that rocks the lens drive device 2; a support point 19 that is the center of rocking of the lens drive device 2; and a leaf spring 17 that supports the lens drive device 2 to rock. The rocking drive mechanism 6 includes a coil for driving 23 and a magnet for driving 21. The magnet for driving 21 is rocked together with the lens drive device 2, and the coil for driving 23 is fixed to the support body 5. In the optical device for photography 1, energizing force for energizing the lens drive device 2 in a direction going toward the support point 19 is generated by the attractive force generated between a magnetic member 20 and the magnet for driving 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  2. Description of the Related Art In recent years, a photographing optical device is mounted on a portable device such as a cellular phone. In the case of a mobile device, camera shake tends to occur during shooting. Therefore, an optical apparatus capable of correcting camera shake during shooting has been proposed (see, for example, Patent Document 1).

  The optical device described in Patent Document 1 is fixed to a movable portion on which a lens and an image sensor are mounted, a pivot shaft that is fixed to the base of the optical device and contacts the bottom surface of the movable portion, and a base. A leaf spring for swingably supporting the movable part and a swinging mechanism for swinging the movable part are provided. In this optical device, the swing mechanism is composed of a drive coil and a drive magnet, and the movable portion swings about the pivot shaft as a fulcrum by the drive force of the swing mechanism, and the camera shake is corrected. Yes.

  In this optical device, the leaf spring is fixed to the fixed piece fixed to the base, the outer frame piece connected to the fixed piece via the X-axis deforming portion, and the outer frame piece via the Y-axis deforming portion. And a support piece for the movable part to be coupled. When the movable part swings, the X-axis deformation part and the Y-axis deformation part are twisted. In this optical device, the leaf spring is fixed to the base in a bent state so as to generate a pressure for reliably bringing the tip of the pivot shaft into contact with the bottom surface of the movable portion.

JP 2007-310084 A

  As described above, in the optical device described in Patent Document 1, the base plate is bent in a state in which the leaf spring is bent so as to generate a pressure for reliably bringing the tip of the pivot shaft into contact with the bottom surface of the movable portion. It is fixed to. Here, a portable device on which the optical device described in Patent Document 1 is mounted is susceptible to disturbances such as vibration and impact. For this reason, it is preferable to generate a relatively large pressurization to ensure that the tip of the pivot shaft is in contact with the bottom surface of the movable part.

  However, in the optical device described in Patent Document 1, if the spring constant of the leaf spring is increased in order to generate a predetermined pressurization, there is a risk of hindering the swinging of the movable part. On the other hand, if the spring constant of the leaf spring is reduced, the amount of bending of the leaf spring must be increased in order to generate a predetermined pressurization, which may increase the size of the optical device.

  Accordingly, an object of the present invention is to appropriately swing a lens driving device equipped with a lens and an image pickup device, and to reduce the size and thickness of the lens driving device. An object of the present invention is to provide a photographing optical device capable of suppressing the influence of disturbance.

  In order to solve the above problems, a photographic optical device according to the present invention includes a lens driving device including a lens, an imaging element, and a lens driving mechanism that drives the lens, a support that supports the lens driving device, and lens driving. A sensor that detects the tilt of the device, and a camera shake correction mechanism that corrects camera shake by swinging the lens drive device with respect to the support based on the detection result of the sensor. A rocking drive mechanism for rocking, a fulcrum part that is a rocking center of the lens driving device, and a leaf spring that supports the lens driving device so as to be rockable. The rocking driving mechanism includes a driving coil and a driving coil. And either one of the driving coil or the driving magnet swings together with the lens driving device, and the other of the driving coil or the driving magnet is fixed to the support, and the camera shake correction mechanism. Furthermore, by the suction force generated between the driving magnet, characterized in that it comprises a magnetic member for generating an urging force for urging the lens driving device in the direction towards the fulcrum.

  In the photographic optical device according to the present invention, the camera shake correction mechanism includes a magnetic member that generates a biasing force that biases the lens driving device in a direction toward the fulcrum by an attractive force generated between the camera and the driving magnet. . Therefore, it is possible to suppress the influence of disturbances such as vibration and impact by the attractive force generated between the magnetic member and the driving magnet. Therefore, it is not necessary to urge the lens driving device in the direction toward the fulcrum by the leaf spring. That is, it is not necessary to bend the leaf spring. Further, since it is not necessary to suppress the influence of the disturbance by the leaf spring, it is possible to reduce the spring constant of the leaf spring. Or even if it is a case where a lens drive device is urged | biased in the direction which goes to a fulcrum part with a leaf | plate spring, it becomes possible to make small the urging | biasing force by a leaf | plate spring. Therefore, even if the spring constant of the leaf spring is reduced, the amount of deflection of the leaf spring can be reduced.

  Thus, in the present invention, since the spring constant of the leaf spring can be reduced, the spring constant of the leaf spring is set so as not to hinder the swinging operation of the lens driving device by the swing driving mechanism. Is possible. Therefore, it is possible to appropriately swing the lens driving device according to the driving force of the swing driving mechanism. In the present invention, it is not necessary to bend the leaf spring, or the amount of bending of the leaf spring can be reduced, so that the space for bending the leaf spring can be omitted or reduced. Therefore, it is possible to reduce the size and thickness of the photographing optical device.

  In the present invention, for example, the driving coil and the magnetic member are fixed to the support, and the magnetic member is disposed on the fulcrum side of the magnetic center position of the driving magnet. In this case, it is preferable that the support body includes a case body that is formed of a non-magnetic material and forms an outer peripheral surface of the photographing optical device, and the magnetic member is fixed to the case body. If comprised in this way, it will become possible to fix a magnetic member to a case body, after arrange | positioning a drive magnet inside the case body formed of a nonmagnetic material at the time of the assembly of the imaging optical device. Therefore, it is possible to prevent the magnetic member from being attracted by the driving magnet when the photographing optical device is assembled, and the photographing optical device can be assembled smoothly and accurately.

  In the present invention, the case body preferably has an opening in which the magnetic member is disposed. If comprised in this way, compared with the case where a magnetic member is arrange | positioned on the outer peripheral surface of a case body, the optical device for imaging | photography can be reduced in size.

  In the present invention, the fulcrum portion is disposed at a position through which the optical axis of the lens driving device passes, and the magnetic member and the driving magnet in a direction parallel to the optical axis when no current is supplied to the driving coil. It is preferable to arrange so that it may overlap. If comprised in this way, the lens drive device can be urged | biased in the direction which goes to a fulcrum part efficiently using the attractive force which arises between the magnet for a drive and a magnetic member. Therefore, even if the attractive force generated between the driving magnet and the magnetic member is reduced, the lens driving device can be biased with a relatively large force in the direction toward the fulcrum.

  In the present invention, the leaf spring may be fixed to the support body in a bent state so that an urging force for urging the lens driving device in a direction toward the fulcrum portion is generated. In this case, the attractive force generated between the driving magnet and the magnetic member can be set small.

  As described above, in the photographic optical device according to the present invention, the lens driving device can be appropriately swung, and the size and thickness can be reduced, and disturbances such as vibration and impact can be achieved. It becomes possible to suppress the influence of.

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

(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. In the following description, as shown in FIG. 1, the three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. In FIG. 1, the X1 direction side is the “right” side, the X2 direction side is the “left” side, the Y1 direction side is the “front” side, the Y2 direction side is the “rear (rear)” side, and the Z1 direction side is “up”. The “side” and the Z2 direction side are the “lower” side. In this embodiment, the Z direction is the direction of the optical axis L (optical axis direction) of the photographing optical device 1 when it is not swinging.

  The photographic optical device 1 of this embodiment is a small and thin camera mounted on a portable device such as a cellular phone, and is formed in a substantially rectangular parallelepiped shape as a whole. As shown in FIGS. 1 and 2, the photographing optical device 1 includes a lens driving device 2 on which a lens and an imaging device (not shown) are mounted, a sensor 4 that detects the tilt of the lens driving device 2, and lens driving. A support 5 that supports the device 2 and a swing drive mechanism 6 that swings the lens drive device 2 are provided.

  As described above, the lens driving device 2 is equipped with a lens and an image sensor. Specifically, a lens is mounted on the upper end side of the lens driving device 2, and an imaging element is mounted on the lower end of the lens driving device 2. The lens driving device 2 is equipped with a lens driving mechanism for driving the lens in the optical axis direction. This lens driving mechanism is constituted by, for example, a driving coil and a driving magnet.

  The lens driving device 2 is formed in a substantially rectangular parallelepiped shape as a whole. The front and rear and left and right side surfaces of the lens driving device 2 are covered with a cover member 9 formed in a substantially square cylindrical shape with a bottom having an open lower end. The cover member 9 is made of a magnetic material. A circular through hole 9a is formed at the bottom of the cover member 9 disposed on the upper end side. In addition, a flange 9b is formed at the lower end of the cover member 9 so as to expand outward in the front-rear direction and outward in the left-right direction. A drive magnet 21 (described later) that constitutes the swing drive mechanism 6 is fixed to each of the front and rear and left and right side surfaces of the cover member 9.

  The sensor 4 is a gyro sensor (angular velocity sensor) and is disposed below the lens driving device 2. A flexible printed circuit board (FPC) 10 is connected to the sensor 4. The FPC 10 is also connected to an image sensor mounted on the lens driving device 2. The FPC 10 is drawn on the lower end side of the photographing optical device 1 and pulled out from the left side surface of the photographing optical device 1.

  The sensor 4 is disposed inside a sensor cover member 11 that is formed in a flat and substantially rectangular tube shape with a bottom that opens at the upper end. At the center of the bottom of the sensor cover member 11 disposed on the lower end side, a contact surface 11a with which a fulcrum protrusion 15b described later contacts is formed in a flat shape. Further, at the upper end of the sensor cover member 11, a flange portion 11 b that comes into contact with the flange portion 9 b of the cover member 9 from below is formed so as to spread outward in the front-rear direction and outward in the left-right direction. In this embodiment, the flange portion 9b and the flange portion 11b are fixed to each other. That is, the sensor cover member 11 is fixed to the lower end of the cover member 9.

  In this embodiment, the lens driving device 2, the sensor 4, the cover member 9, and the sensor cover member 11 are supported by the support 5 so as to be swingable. That is, the lens driving device 2, the sensor 4, the cover member 9 and the sensor cover member 11 constitute a movable module 12 that can swing with respect to the support 5.

  The support 5 includes a base body 15 constituting the lower surface of the photographing optical device 1 and case bodies 16 constituting the front and rear and left and right outer peripheral surfaces of the photographing optical device 1. A stopper member 18 for restricting the swing range of the movable module 12 is fixed to the case body 16. Further, a leaf spring 17 is fixed to the stopper member 18 to support the lens driving device 2 in a swingable manner (more specifically, to support the movable module 12 in a swingable manner). Further, a magnetic member 20 for urging the lens driving device 2 downward is fixed to the case body 16 in cooperation with a driving magnet 21 which will be described later constituting the swing driving mechanism 6.

  The base body 15 is formed in a substantially rectangular shape. A projecting portion 15 a projecting upward is formed at the approximate center of the base body 15. In addition, a fulcrum protrusion 15b serving as a fulcrum for swinging the movable module 12 is formed on the upper surface of the protruding portion 15a. In other words, in this embodiment, the swinging fulcrum of the movable module 12 is disposed below the movable module 12. The fulcrum protrusion 15 b is formed in a hemispherical shape, for example, and is in contact with the contact surface 11 a of the sensor cover member 11. In this embodiment, a fulcrum portion 19 serving as a center of oscillation of the lens driving device 2 is configured by the fulcrum protrusion 15b and the contact surface 11a. The fulcrum portion 19 is disposed at a position where the optical axis L of the lens driving device 2 passes. The optical axis L of the lens driving device 2 is arranged at the center of the movable module 12.

  The case body 16 is formed in a substantially rectangular tube shape having upper and lower ends opened. The case body 16 of this embodiment is formed of a nonmagnetic material. The case body 16 is made of a metal material. On the front and rear side surfaces of the case body 16 and the lower end sides of the left and right side surfaces, openings 16a in which the magnetic members 20 are disposed are formed so as to penetrate the respective side surfaces. The opening 16a is formed in a substantially rectangular shape. The magnetic member 20 is formed in a rectangular plate shape by a magnetic material such as an electromagnetic steel plate.

  The plate spring 17 is formed in a substantially rectangular shape as a whole. The four corners of the leaf spring 17 are fixed to the case body 16 via the stopper member 18, and the movable module 12 (specifically, the sensor cover member 11) is fixed to the center portion of the leaf spring 17. The leaf spring 17 includes a fixed portion that is fixed to the case body 16, a holding portion that holds the movable module 12, and a spring portion that connects the fixing portion and the holding portion.

  The stopper member 18 is fixed to the inner peripheral surface of the case body 16. Specifically, the two stopper members 18 are provided in the case body at positions where they can contact the upper surface of the flange portion 9b of the cover member 9 and positions where they can contact the lower surface of the flange portion 11b of the sensor cover member 11. 16 is fixed to the inner peripheral surface, and the swing range of the movable module 12 is regulated by the stopper member 18 and the flange portions 9b and 11b.

  The swing drive mechanism 6 includes a drive magnet 21 and a drive coil 23 disposed to face the drive magnet 21. The swing drive mechanism 6 of this embodiment includes four drive magnets 21 and four drive coils 23.

  The drive magnet 21 is formed in a substantially rectangular plate shape. The driving magnet 21 is composed of two magnet pieces, a first magnet piece 21a and a second magnet piece 21b. Specifically, the first magnet piece 21a and the second magnet piece 21b are bonded and fixed while the lower surface of the first magnet piece 21a and the upper surface of the second magnet piece 21b are in contact with each other. Is formed. The first magnet piece 21a and the second magnet piece 21b are formed to have the same width. In addition, the thickness of the 1st magnet piece 21a and the thickness of the 2nd magnet piece 21b differ as mentioned later.

  One drive magnet 21 is fixed to each of the front and rear side surfaces and the left and right side surfaces of the cover member 9, and is disposed inside the case body 16. The driving magnet 21 swings together with the lens driving device 2. As described above, the cover member 9 is made of a magnetic material, and the cover member 9 functions as a back yoke of the drive magnet 21.

  In this embodiment, the driving magnet 21 fixed to the left and right side surfaces of the cover member 9 is magnetized so that the magnetic pole formed on the right surface of the driving magnet 21 is different from the magnetic pole formed on the left surface. The driving magnet 21 fixed to the left and right side surfaces of the cover member 9 includes a magnetic pole formed on the outer surface of the first magnet piece 21a and a magnetic pole formed on the outer surface of the second magnet piece 21b in the left-right direction. Are different (that is, the magnetic poles formed on the inner surface of the first magnet piece 21a and the magnetic poles formed on the inner surface of the second magnet piece 21b in the left-right direction) are magnetized.

  Similarly, the driving magnet 21 fixed to the front and rear side surfaces of the cover member 9 is magnetized so that the magnetic pole formed on the front surface of the driving magnet 21 and the magnetic pole formed on the rear surface are different. Further, the driving magnet 21 fixed to the front and rear side surfaces of the cover member 9 includes a magnetic pole formed on the outer surface of the first magnet piece 21a and a magnetic pole formed on the outer surface of the second magnet piece 21b in the front-rear direction. Are magnetized differently.

  For example, the right side surface of the first magnet piece 21 a of the driving magnet 21 fixed to the right side surface of the cover member 9 is magnetized to the S pole and the left side surface is magnetized to the N pole. The second magnet piece 21 b of the driving magnet 21 is magnetized. The right side is magnetized to the N pole and the left side is magnetized to the S pole. Similarly, the left side surface of the first magnet piece 21a of the driving magnet 21 fixed to the left side surface of the cover member 9 is magnetized to the S pole, and the right side surface is magnetized to the N pole. The left side surface of 21b is magnetized to the N pole, and the right side surface is magnetized to the S pole.

  Further, for example, the rear side surface of the first magnet piece 21 a of the driving magnet 21 fixed to the rear side surface of the cover member 9 is magnetized to the N pole, and the front side surface is magnetized to the S pole. The rear side of the piece 21b is magnetized to the S pole and the front side is magnetized to the N pole. Similarly, the front side surface of the first magnet piece 21a of the driving magnet 21 fixed to the front side surface of the cover member 9 is magnetized to the N pole, and the rear side surface is magnetized to the S pole. The front side surface of 21b is magnetized to the S pole and the rear side surface is magnetized to the N pole.

  The driving coil 23 is formed by winding a fusion wire including an insulating coating covering the periphery of the conducting wire and a fusion coating further covering the periphery of the insulating coating in an air-core shape (that is, a core such as a bobbin). Air core coil). The driving coil 23 is formed by winding a fusion wire in a substantially rectangular shape. One drive coil 23 is fixed to each of the front and rear side surfaces and the left and right side surfaces of the case body 16 via an insulating film. Specifically, the driving coil 23 is fixed to the inner peripheral side of the case body 16 so that the short direction and the vertical direction of the driving coil 23 wound in a substantially rectangular shape coincide with each other.

  As shown in FIG. 2, the driving magnet 21 and the driving coil 23 are arranged to face each other with a predetermined gap. Specifically, even if the movable module 12 swings with the fulcrum portion 19 as a fulcrum, the drive magnet 21 and the drive coil 23 are set in a predetermined manner so that the drive magnet 21 and the drive coil 23 do not come into contact with each other. Oppositely arranged with a gap.

  In this embodiment, when no current is supplied to the driving coil 23, the movable module 12 is in a neutral position that is not inclined with respect to the support 5 as shown in FIG. 2. In this embodiment, the left and right outer surfaces of the drive magnets 21 fixed to the left and right side surfaces of the cover member 9 are the outer sides in the left and right direction as the movable module 12 is in the neutral position. The drive magnet 21 is formed so that the cross-sectional shape when viewed from the front-rear direction is substantially trapezoidal. Similarly, when the movable module 12 is in the neutral position, the outer surface in the front-rear direction of the driving magnet 21 fixed to the front and rear side surfaces of the cover member 9 is gradually moved outward in the front-rear direction as it goes downward. The drive magnet 21 is formed so that its cross-sectional shape is substantially trapezoidal when viewed from the left-right direction.

  Further, in this embodiment, as shown in FIG. 2, the center position of the driving coil 23 in the vertical direction is arranged above the contact surface 27 between the first magnet piece 21a and the second magnet piece 21b. The driving magnet 21 and the driving coil 23 are arranged to face each other.

  Furthermore, in this embodiment, the center position of the magnetic member 20 in the vertical direction is disposed below the contact surface 27 between the first magnet piece 21a and the second magnet piece 21b, which is the magnetic center of the drive magnet 21. ing. Specifically, the magnetic member 20 is disposed below the contact surface 27 that is the magnetic center of the drive magnet 21. That is, the magnetic member 20 is disposed closer to the fulcrum 19 than the contact surface 27. More specifically, the magnetic member 20 is disposed outside the driving magnet 21 in the left-right direction or the front-rear direction and obliquely below the driving magnet 21.

  Therefore, an urging force that urges the movable module 12 downward is generated by the attractive force generated between the magnetic member 20 and the driving magnet 21. That is, the magnetic member 20 urges the movable module 12 in a direction toward the fulcrum portion 19 (that is, a direction in which the fulcrum protrusion 15b and the contact surface 11a abut) by an attractive force generated between the magnetic member 20 and the drive magnet 21. The urging force to generate is generated. The magnetic member 20 is disposed below the driving coil 23.

The downward urging force generated in the movable module 12 by the attractive force of the magnetic member 20 and the driving magnet 21 is, for example, the vibration function of the mobile phone if the photographing optical device 1 is mounted on the mobile phone. Therefore, the fulcrum protrusion 15b and the contact surface 11a are not separated from each other even when the photographic optical device 1 vibrates. For example, assuming that the total mass of the movable module 12 and the driving magnet 21 is M and the vibration acceleration of the vibration of the mobile phone is α, the downward direction generated in the movable module 12 due to the attractive force between the magnetic member 20 and the driving magnet 21. The urging force F is set so as to satisfy the following expression (1).
F> α × M Formula (1)
Note that the vibration acceleration α is, for example, 4G or more.

  In the photographic optical device 1 configured as described above, when camera shake is detected by the sensor 4, current is supplied to the driving coil 23 based on the detection result of the sensor 4, and the movable module 12 is connected to the fulcrum portion. The camera shake is corrected by swinging around 19. In this embodiment, the lens is based on the detection result of the sensor 4 by the fulcrum portion 19 including the contact surface 11a and the fulcrum protrusion 15b, the swing drive mechanism 6, the leaf spring 17, and the magnetic member 20. A camera shake correction mechanism that corrects camera shake by swinging the drive device 2 is configured.

  Further, in the photographic optical device 1 configured as described above, the movable module 12 with the driving magnet 21 is disposed inside the case body 16 so that the driving magnet 21 and the driving coil 23 face each other. After that, the magnetic member 20 is fixed to the opening 16 a of the case body 16.

(Main effects of this form)
As described above, in this embodiment, the biasing force that biases the movable module 12 in the direction toward the fulcrum portion 19 is generated by the attractive force of the magnetic member 20 and the driving magnet 21. Therefore, the influence of disturbance such as vibration and impact can be suppressed by the attractive force generated between the magnetic member 20 and the driving magnet 21. Therefore, it is not necessary to urge the movable module 12 in the direction toward the fulcrum 19 by the leaf spring 17. That is, it is not necessary to bend the leaf spring 17 in order to bias the movable module 12 in the direction toward the fulcrum 19. As a result, in this embodiment, a space for bending the leaf spring 17 can be omitted, and the photographing optical device 1 can be reduced in size and thickness.

  Further, since it is not necessary to suppress the influence of the disturbance by the leaf spring 17, the spring constant of the leaf spring 17 can be set small so as not to hinder the swing operation of the movable module 12 by the swing drive mechanism 6. become. Therefore, the lens driving device 2 can be appropriately swung according to the driving force of the swing driving mechanism 6. In addition, since the spring constant of the leaf spring 17 can be set so that the swing operation of the movable module 12 by the swing drive mechanism 6 is not hindered, the degree of freedom in designing the leaf spring 17 is increased.

  In this embodiment, the magnetic member 20 is fixed to the case body 16 formed of a nonmagnetic material and constituting the outer peripheral surface of the photographing optical device 1. Therefore, as described above, the movable module 12 with the driving magnet 21 is used. The magnetic member 20 can be fixed to the case body 16 after the is placed inside the case body 16. Therefore, it is possible to prevent the magnetic member 20 from being attracted to the drive magnet 21 when the photographing optical device 1 is assembled, and the photographing optical device 1 can be assembled smoothly and accurately.

  In this embodiment, the case body 16 is formed with an opening 16a in which the magnetic member 20 is disposed. Therefore, compared with the case where the magnetic member 20 is fixed to the outer peripheral surface of the case body 16, the imaging optical device 1 can be reduced in size.

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

  In the embodiment described above, the magnetic member 20 is disposed outside the driving magnet 21 in the left-right direction or the front-rear direction and obliquely below the driving magnet 21. In addition to this, as shown in FIG. 3, for example, when no current is supplied to the driving coil 23 (that is, when the movable module 12 is in the neutral position), the magnetic member is parallel to the optical axis L. The magnetic member 20 may be disposed below the drive magnet 21 so that 20 and the drive magnet 21 overlap. In this case, since an attractive force is generated between the magnetic member 20 and the driving magnet 21 in the vertical direction, the attractive force generated between the magnetic member 20 and the driving magnet 21 is efficiently used, The lens driving device 2 can be urged in the direction toward the fulcrum portion 19. Therefore, even if the attractive force generated between the magnetic member 20 and the driving magnet 21 is reduced, the lens driving device 2 can be biased in a direction toward the fulcrum portion 19 with a relatively large force.

  In the embodiment described above, the biasing force that biases the movable module 12 in the direction toward the fulcrum portion 19 is generated by the attractive force of the magnetic member 20 and the driving magnet 21. In addition, for example, in addition to the attractive force between the magnetic member 20 and the driving magnet 21, a biasing force that biases the movable module 12 in the direction toward the fulcrum 19 may be generated by the leaf spring 17. That is, even if the leaf spring 17 is bent and fixed to the base member 15, the case body 16, or the stopper member 18 so as to generate a biasing force that biases the lens driving device 2 in the direction toward the fulcrum portion 19. good.

  In this case, the downward urging force of the movable module 12 by the leaf spring 17 can be reduced, so that the leaf spring 17 does not interfere with the swing operation of the movable module 12 by the swing drive mechanism 6. Even if the spring constant is reduced, the amount of bending of the leaf spring 17 can be reduced. Accordingly, it is possible to appropriately swing the lens driving device 2 in accordance with the driving force of the swing driving mechanism 6, and it is possible to reduce the space for bending the leaf spring 17 and to shoot optical. The device 1 can be reduced in size and thickness. In this case, the attractive force generated between the magnetic member 20 and the driving magnet 21 can be set small.

  In the embodiment described above, the magnetic member 20 and the driving magnet 21 generate a biasing force that biases the movable module 12 in the direction toward the fulcrum portion 19. In addition to this, for example, the stopper member 18 may be formed of a magnetic material, and the biasing force for biasing the movable module 12 in the direction toward the fulcrum 19 may be generated by the stopper member 18 and the driving magnet 21. . Further, the base member 15 may be formed of a magnetic material, and a biasing force that biases the movable module 12 in a direction toward the fulcrum portion 19 may be generated by the base member 15 and the driving magnet 21.

  In the embodiment described above, the magnetic member 20 is disposed in the opening 16 a of the case body 16. In addition, for example, the magnetic member 20 may be fixed to the outer peripheral surface of the case body 16 without forming the opening 16 a in the case body 16.

  In the embodiment described above, the magnetic member 20 is disposed below the driving coil 23. That is, in the case body 16, the opening 16 a is formed below the fixed portion of the driving coil 23. In addition, for example, in the case body 16, an opening 16 a is formed up to the fixed portion of the driving coil 23, and a part of the magnetic member 20 is disposed outside the driving coil 23 in the left-right direction or the front-rear direction. Also good. In this case, the permeance coefficient of the magnetic circuit formed by the drive magnet 21 and the drive coil 23 can be increased, and the drive force of the swing drive mechanism 6 can be increased.

  In the embodiment described above, the drive magnet 21 is attached to the cover member 9, and the drive coil 23 is attached to the case body 16. In addition, for example, the driving magnet 21 may be attached to the case body 16 via a yoke, and the driving coil 23 may be attached to the cover member 9. In this case, the magnetic member 20 is attached to the cover member 9 above the contact surface 27 that is the magnetic center of the drive magnet 21. If the case body 16 is formed of a magnetic material, the drive magnet 21 may be directly attached to the case body 16.

  In the embodiment described above, the fulcrum protrusion 15 b is formed on the base body 15, and the contact surface 11 a on which the fulcrum protrusion 15 b abuts is formed on the sensor cover member 11. In addition, for example, a fulcrum protrusion may be formed on the sensor cover member 11, and a contact surface with which the fulcrum protrusion abuts may be formed on the base body 15. Further, a fulcrum projection 15b may be formed on the base body 15, and a recess may be formed on the sensor cover member 11 to engage the fulcrum projection 15b. A fulcrum projection may be formed on the sensor cover member 11, and the fulcrum projection may be engaged. A concave portion to be joined may be formed in the base body 15.

  In the embodiment described above, the drive magnet 21 is constituted by two magnet pieces, the first magnet piece 21a and the second magnet piece 21b. In addition to this, for example, the drive magnet 21 may be configured by a single magnet piece.

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 schematic diagram for demonstrating the arrangement | positioning relationship between the drive magnet and magnetic member concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical device for imaging | photography 2 Lens drive device 4 Sensor 5 Support body 6 Oscillation drive mechanism 16 Case body 16a Opening part 17 Leaf spring 19 Supporting point part 20 Magnetic member 21 Driving magnet 23 Driving coil 27 Contact surface (magnetic center)
L Optical axis

Claims (6)

A lens driving device equipped with a lens, an image sensor, and a lens driving mechanism for driving the lens, a support body for supporting the lens driving device, a sensor for detecting the tilt of the lens driving device, and detection by the sensor A camera shake correction mechanism that corrects camera shake by swinging the lens driving device with respect to the support based on the result,
The camera shake correction mechanism includes a swing drive mechanism that swings the lens drive device, a fulcrum portion that is a swing center of the lens drive device, and a leaf spring that supports the lens drive device so as to be swingable. ,
The swing drive mechanism includes a drive coil and a drive magnet,
Either the driving coil or the driving magnet swings together with the lens driving device, and the other of the driving coil or the driving magnet is fixed to the support,
The camera shake correction mechanism further includes a magnetic member that generates an urging force for urging the lens driving device in a direction toward the fulcrum portion by an attractive force generated between the image stabilization mechanism and the driving magnet. Optical device. The drive coil and the magnetic member are fixed to the support,
The photographic optical device according to claim 1, wherein the magnetic member is disposed closer to the fulcrum than a magnetic center position of the driving magnet. The support includes a case body that is formed of a non-magnetic material and constitutes an outer peripheral surface of the imaging optical device.
The photographic optical device according to claim 2, wherein the magnetic member is fixed to the case body.   4. The photographing optical device according to claim 3, wherein the case body has an opening in which the magnetic member is disposed. The fulcrum portion is disposed at a position where the optical axis of the lens driving device passes,
5. The magnetic member according to claim 1, wherein the magnetic member is disposed so as to overlap the driving magnet in a direction parallel to the optical axis when no current is supplied to the driving coil. An optical device for photographing according to claim 1.   2. The leaf spring is fixed to the support body in a bent state so as to generate a biasing force that biases the lens driving device in a direction toward the fulcrum. 5. The photographing optical device according to any one of 5 above.

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