JP2013025035A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device configured to include an offset in a lens holder, which can rock the lens holder, regardless of the position of the lens holder, is simple in structure, and can be miniaturized.SOLUTION: The lens drive device includes a lens holder 12 holding a lens 11, a driving coil 15 wound on the outer circumferential side of the lens holder 12, a case 14 being a fixed member, a driving magnet 16 held by the case 14 and arranged to face the driving coil 15 with a gap, and a lock member 13 arranged on the side opposite to an object side of the lens holder 12 and coming into contact with the lens holder 12. The lens drive device is configured so that the lock member 13 is suspended and supported to be swingable with respect to the case 14 by spring members for locking 19A and 19B and the lens holder 12 can be moved to the object side with respect to the lock member 13 and is suspended and supported in such a state that the lens holder 12 is energized to the opposite side to the object side by spring members for driving 18A and 18B.

Description

  The present invention relates to a lens driving device capable of suppressing camera shake of, for example, a photographing optical apparatus.

In recent years, a camera mounted on a mobile phone or the like has increased in the number of pixels of an image sensor, and the quality of captured images has been improved. Along with this, the lens system to be mounted is also shifting from the conventional fixed focus camera module to the movable focus camera module. This is because a fixed-focus camera module causes out-of-focus blur and cannot cope with the resolution of the high pixel number image sensor.
As a lens system driving method in a movable focus camera module, a lens driving device 50 using a voice coil motor as shown in FIG. 16 is often used (see, for example, Patent Document 1).

The lens driving device 50 includes a yoke 51 having a U-shaped cross section made of a magnetic material such as soft iron, a driving magnet 52 attached to the inner wall side of the yoke 51, a lens holder 54 that holds the lens 53 at the center position, A driving coil 55 attached to the lens holder 54, a case 56 to which the yoke 51 is attached on the inner peripheral side, and upper and lower spring members 57A and 57B connecting the lens holder 54 and the case 56 are provided.
As the driving magnet 52, a cylindrical magnet or a plurality of arc-shaped magnets arranged in an annular shape on the inner wall side of the yoke 51 is used. The drive coil 55 is installed in a magnetic field that is applied by the yoke 51 and the drive magnet 52 and is distributed radially around the coil.
Accordingly, when the drive coil 55 is energized, a Lorentz force is generated in the drive coil 55 in the direction of the subject (forward in the Z-axis direction indicated by the arrow in FIG. 16). It can be moved to a position balanced with the restoring force of 57A and 57B. That is, the position of the lens 53 can be controlled by controlling the amount of movement of the lens holder 54 by controlling the current value supplied to the driving coil 55.

By the way, when attaching the lens holder 54 to the case 56, in order to focus the image at infinity on an image sensor (not shown), the case 56 is provided with a locking portion 56k that supports the lens holder 54 from below. The spring members 57A and 57B are attached in a state offset by P ₀ forward in the Z-axis direction. Thus, when the drive coil 55 is energized, the lens holder is offset by the offset P ₀ applied to the spring members 57A and 57B until the magnitude of the drive current reaches the starting current value I ₀ as shown in FIG. 54 is maintained in contact with the case 56, and the lens holder 54 moves forward in the Z-axis according to Hook's law from the point where the magnitude of the drive current exceeds the starting current value I _0. .
Thus, by providing the offset P ₀ , the lens holder 54 can be stably held at the lowest position even when the lens driving device 50 is directed upward or downward.

JP 2004-280031 A

By the way, in the conventional lens driving device, as described above, since the camera shake cannot be suppressed only by the focus driving, it is necessary to separately provide a drive system in order to suppress the camera shake.
However, if a mechanism for suppressing camera shake is separately provided, there is a problem that the structure becomes complicated and it is difficult to reduce the size.

  The present invention has been made in view of conventional problems, and in a lens driving device in which an offset is provided by pushing the lens holder forward by a locking member, the lens holder is swung regardless of the position of the lens holder. An object of the present invention is to provide a lens driving device that can be made simple and can be downsized.

According to the first aspect of the present invention, the lens holder that holds the lens, the driving coil wound around the outer periphery of the lens holder, the case that is a fixing member, and the driving that is held by the case A lens driving device comprising a driving coil and a driving magnet arranged so as to face each other with a gap, and is disposed on a side opposite to the subject side of the lens holder and abuts against the lens holder The locking member is suspended and supported by the locking spring member so as to be swingable with respect to the case, and the lens holder is movable toward the subject side with respect to the locking member by the driving spring member; It is biased to the side opposite to the subject side and is suspended and supported.
By adopting such a configuration, the magnet used for focus drive can be shared with camera shake suppression drive, and the lens holder can be swung regardless of the position of the lens holder. It is possible to provide a lens driving device capable of performing
Note that “swing” refers to the movement in the XY plane and the plane perpendicular to the Z axis when the subject side is the front in the Z axis direction and the two directions perpendicular to the Z axis are the X axis direction and the Y axis direction, respectively. And rotational movement in the inside.

According to a second aspect of the present invention, in the lens driving device according to the first aspect, an auxiliary driving coil is attached to the locking member.
Accordingly, the locking member can be swung with a simple configuration.
According to a third aspect of the present invention, in the lens driving device according to the second aspect, the auxiliary driving coil is disposed in the driving magnet with a gap.
Thereby, the locking member can be swung efficiently.
A fourth aspect of the present invention is the lens driving device according to the second aspect, wherein the auxiliary driving coil includes an auxiliary driving magnet disposed with a gap.
As described above, even when the auxiliary driving magnet is provided and the magnetic field is applied to the auxiliary driving coil, the locking member can be efficiently swung.
According to a fifth aspect of the present invention, in the lens driving device according to the fourth aspect, a magnetic yoke is disposed outside the auxiliary driving magnet.
Thus, by providing the magnetic yoke, a magnetic field can be effectively applied to the auxiliary driving coil, so that the locking member can be swung efficiently.

A sixth aspect of the present invention is the lens driving device according to the first aspect, wherein the driving coils face each other across the lens holder when the subject side is the front in the Z-axis direction. Provided with at least one pair of coils wound in a direction orthogonal to the Z-axis direction, and the drive magnet is different from the first magnet disposed in front of the Z-axis direction. And a second magnet having polarity and disposed rearward in the Z-axis direction.
By adopting such a configuration, the locking member can be swung without providing an auxiliary drive coil.

  The summary of the invention does not list all necessary features of the present invention, and a sub-combination of these feature groups can also be an invention.

It is a longitudinal cross-sectional view which shows the structure of the lens drive device which concerns on Embodiment 1 of this invention. 1 is a plan view of a lens driving device according to Embodiment 1. FIG. FIG. 3 is an exploded perspective view of the lens driving device according to the first embodiment. It is a figure which shows the magnetic field and magnetic flux density distribution which a drive magnet generate | occur | produces. It is a top view which shows the other structure of the lens drive device by this invention. It is a longitudinal cross-sectional view which shows the other structure of the lens drive device by this invention. It is a figure which shows the relationship between a drive magnet and a magnetic yoke. 6 is a diagram illustrating a configuration of a lens driving device according to Embodiment 2. FIG. FIG. 6 is an exploded perspective view of a lens driving device according to a second embodiment. 6 is a diagram illustrating a configuration of a lens driving device according to Embodiment 3. FIG. FIG. 10 is a diagram for explaining the operation of the lens driving device according to the third embodiment. FIG. 10 is a diagram for explaining the operation of the lens driving device according to the third embodiment. It is a top view which shows the other structure of the lens drive device by this invention. It is a top view which shows the other structure of the lens drive device by this invention. It is a figure which shows the relationship between the coil for auxiliary drives and an auxiliary magnet in the lens drive device of FIG. It is a longitudinal cross-sectional view which shows the structure of the conventional lens drive device. It is a figure which shows the relationship between the applied electric current when there exists offset, and the moving amount | distance of a lens holder.

  Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

Embodiment 1 FIG.
1 to 3 are diagrams showing the configuration of the lens driving device 10 according to the first embodiment. FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view, FIG. 3A is an exploded perspective view, and FIG. (B) is a figure which shows the detail of 19 A of spring members for locking (19B).
The lens driving device 10 includes a lens holder 12 that holds the lens 11, a locking member 13, a case 14, a driving coil 15, a driving magnet 16, an auxiliary driving coil 17, a driving spring member 18A, 18B and locking spring members 19A and 19B.
As shown in FIG. 1, a camera module substrate 21 is attached to the lens drive device 10 on the side opposite to the subject side of the case 14, and the lens 11 is focused on the lens holder 12 side of the camera module substrate 21. An image sensor 22 for detecting a subject image is attached to shoot the subject. Further, drive control and camera shake suppression control of the lens holder 12 are performed by current control means (not shown). The current control means controls the current flowing through the driving coil 15 and the auxiliary driving coil 17.
The lens holder 12 is, for example, a cylindrical member, and a lens 11 that is a combination of an objective lens and an eyepiece is held on the inner side, and a driving coil 15 is mounted on the outer side.
In addition to the cylindrical shape, the lens holder 12 may be a rectangular tube shape or an octagonal tube shape.
Hereinafter, assuming that the subject side in the optical axis direction of the lens 11 is the front (+ Z side) in the Z-axis direction, and the two directions perpendicular to the Z-axis are the X-axis direction and the Y-axis direction, respectively, the driving coil 15 It is wound around the Z axis on the outside. The + Z side is also called the upper side, and the -Z side is also called the lower side.

The locking member 13 is disposed on the opposite side to the subject side of the lens holder 12 and has a cylindrical protruding portion 13T that contacts the lens holder 12, and a disc-shaped flange that protrudes in the radial direction from the peripheral surface of the protruding portion 13T. A portion 13a and a cylindrical coil holding portion 13b provided so as to protrude upward from the outer edge portion of the flange 13a. A hole (coil mounting portion) 13s for mounting the auxiliary driving coil 17 is provided on the outer peripheral side of the coil holding portion 13b.
The locking member 13 suspends and supports the lens holder 12 movably to the subject side + Z side by the driving spring members 18A and 18B at the upper and lower portions on the inner peripheral side of the coil holding portion 13b. The lens holder 12 is offset by P ₀ to the + Z side by the protruding portion 13T. Therefore, the restoring force of the drive spring members 18A and 18B urges the lens holder 12 to always be pulled back downward.
The case 14 is a box-like member having an opening 14h on the bottom 14a and having an open upper side, and mounting recesses 14s for holding the driving magnets 16 are formed on the inner sides of the four side surfaces 14b.
In addition, the case 14 is disposed outside the locking member 13, and the locking member 13 can be swung by the locking spring members 19A and 19B on the upper end side of the coil holding portion 13b and the lower end side of the protruding portion 13T. Suspended to support.

The driving coil 15 is a coil for autofocus driving that is wound around the Z axis around the outer periphery of the lens holder 12, and the outer shape when viewed from the + Z side is the same cylindrical shape or the rectangular cylindrical shape as the lens holder 12. Or it is an octagonal cylinder shape.
The drive magnet 16 includes first to fourth magnets 16A to 16D magnetized in a direction perpendicular to the plate surface, and the case 14 so that each magnet 16A to 16D faces the drive coil 15 with a gap. Mounted on. The first and second magnets 16A and 16B are arranged so that the magnetic field directions are in the −X axis direction and the + X axis direction, respectively, and the third and fourth magnets 16C and 16D are in the −Y axis direction, respectively. And the + Y-axis direction. That is, the surfaces of the first to fourth magnets 16 </ b> A to 16 </ b> D on the side of the driving coil 15 are all arranged to be N poles.
The auxiliary driving coil 17 is wound around the X-axis and is arranged with a first gap and a gap between the first and second magnets 16A and 16B, and the third and second auxiliary coils 17A and 17B. The fourth magnets 16C and 16D are provided with third and fourth auxiliary coils 17C and 17D, respectively, spaced apart from each other.
In this example, the upper side of the first to fourth auxiliary coils 17A to 17D is near the upper end of the first to fourth magnets 16A to 16D, and the lower side is the first to fourth magnets 16A to 16A. The first to fourth auxiliary coils 17A to 17D are arranged so as to be positioned near the lower end of 16D.

Here, the magnetic field generated by each of the magnets 16A to 16D will be described using the second magnet 16B as an example. As shown in FIGS. 4A and 4B, the direction of the magnetic field is substantially in the X direction on a line connecting points A and B that are separated by a distance d in the X direction from both ends in the Z direction of the second magnet 16B. Below the point A and above the point B, the direction of the magnetic field is substantially the Z direction.
In this example, the driving coil 15 is arranged at a position where the magnetic flux density in the X direction is flat as shown in FIG. 4C, and the second magnet 16B is arranged in the Z direction as shown in FIG. If the upper and lower sides are arranged at a position where the magnetic flux density is large, a magnetic field substantially directed in the + X direction can be applied to the driving coil 15 and the upper side of the second auxiliary coil 17B faces upward. A downward magnetic field can be applied to the lower side of the magnetic field.

The drive spring members 18A and 18B are respectively substantially circular connecting an annular outer peripheral portion 18a having an opening at the center, an annular inner peripheral portion 18b, and an outer peripheral portion 18a and an inner peripheral portion 18b. The outer peripheral portion 18a is fixed to the upper and lower portions on the inner peripheral side of the coil holding portion 13b of the locking member 13, and the inner peripheral portion 18b is fixed to the lens holder 12. It is fixed to the upper side and the lower side, respectively. The four arm portions 18 c function as springs that suspend the lens holder 12 from the locking member 13.
As shown in FIG. 3B, the locking spring members 19A and 19B include a square outer peripheral portion 19a having an opening at the center, an annular inner peripheral portion 19b, and an outer peripheral portion 19a. An annular intermediate portion 19c disposed between the inner peripheral portion 19b, the inner peripheral portion 19b and the intermediate portion 19c are connected to each other by a connector 19m on the + Y side and the −Y side, and the outer peripheral portion 19a. And the intermediate portion 19c are connected by a connector 19n on the + X side and the -X side, respectively. The outer peripheral portion 19 a is fixed to the case 14, and the inner peripheral portion 19 b is fixed to the locking member 13. The intermediate portion 19 c functions as a spring that suspends the locking member 13 from the case 14.
In this example, in order to suppress the deformation of the spring, as shown in FIG. 3B, the thickness of the intermediate portion 19c is made larger than the thickness of the outer peripheral portion 19a and the inner peripheral portion 19b. Depending on the weight and the shape of the locking member 13, the thickness may be the same.

Next, the operation of the lens driving device 10 according to the present invention will be described.
In the case of so-called autofocus driving in which the lens holder 12 is moved in the subject direction (Z-axis direction), the driving coil 15 is energized to move the lens holder 12 in the Z-axis direction.
Since a magnetic field substantially orthogonal to the direction of current is applied to the drive coil 15 from the first to fourth magnets 16A to 16D, when a clockwise current in the + Z-axis direction is supplied to the drive coil 15, the drive coil 15 is driven. the use coil 15, the Lorentz force F _L is generated which faces the + Z side shown in FIG. Therefore, the lens holder 12 + moves to the Z side, moves to a position where the Lorentz force F _L and the driving spring member 18A, and the restoring force of 18B balanced.
In order to move the lens holder 12 to the −Z side, a current counterclockwise in the Z-axis direction may be supplied to the driving coil 15.

On the other hand, in order to suppress camera shake, current is supplied to one or more of the first to fourth auxiliary coils 17A to 17D.
First, whether or not camera shake has occurred in the lens 11 or the image sensor 22 is detected by an angular velocity sensor (not shown). If camera shake has occurred, the magnitude and direction of camera shake detected by the angular velocity sensor are sent to a current control means (not shown). The current control means controls the amount of current to be supplied to the first to fourth auxiliary coils 17A to 17D and the direction of supply in accordance with the detected magnitude and direction of the camera shake, thereby swinging the locking member 13. To suppress camera shake.
As described above, the upward magnetic field from the first to fourth magnets 16A to 16D is applied to the upper side of the first to fourth auxiliary coils 17A to 17D, and the downward magnetic field is applied to the lower side. Applied. Therefore, for example, when a camera shake occurs that moves the locking member 13 that supports or holds the lens 11 or the image sensor 22 to the left side (−X direction) in FIG. A current counterclockwise in the X-axis direction as shown in FIG. 1 may be supplied to one or both of the coils 17A and 17B. As a result, a Lorentz force F _c directed in the + X direction is generated in the first and second auxiliary coils 17A and 17B, and the locking member 13 is swung to the right (+ X direction). Camera shake that moves to the left side can be suppressed.
In addition, when a hand movement that causes the locking member 13 to move to the right side occurs, if a current clockwise in the X-axis direction is supplied to one or both of the first and second auxiliary coils 17A and 17B, Good.
Further, when a camera shake occurs that moves the locking member 13 to the upper side (+ Y side) or the lower side (−Y side) in FIG. 2, one of the third and fourth auxiliary coils 17C and 17D. One or both may be supplied with a current counterclockwise in the Y-axis direction or clockwise in the Y-axis direction.
Accordingly, when camera shake occurs in the lens 11 or the image sensor 22, the direction and magnitude of the current flowing through the first to fourth auxiliary coils 17A to 17D are controlled to move the locking member 13 within the XY plane. By doing so, camera shake can be effectively suppressed.
In addition, only the upper side of the first to fourth auxiliary coils 17A to 17D is positioned near the upper end of the first to fourth magnets 16A to 16D, or only the lower side is set to the first to fourth. Even when the magnets 16A to 16D are positioned in the vicinity of the lower ends, the locking member 13 can be moved in the XY plane or rotated around an axis orthogonal to the Z axis.

Further, if the position of the first and second auxiliary coils 17A, 17B in the Z-axis direction is arranged closer to the upper locking spring member 19A, and the current direction is the X-axis direction counterclockwise as described above, Lorentz force F _c is generated which faces the -Z direction in the first auxiliary coil 17A, because the Lorentz force F _c which faces the + Z direction in the second auxiliary coil 17B is generated, the lens holder 12 Y axis It can be rotated clockwise (clockwise in FIG. 1). Conversely, if the position of the first and second auxiliary coils 17A, 17B in the Z-axis direction is arranged closer to the lower locking spring member 19B, the lens holder 12 is rotated counterclockwise in the Y-axis direction in FIG. It can be rotated counterclockwise in FIG.
Similarly, if the positions of the third and fourth auxiliary coils 17C, 17D in the Z-axis direction are arranged closer to the upper locking spring member 19A or closer to the lower locking spring member 19B, The lens holder 12 can be rotated counterclockwise in the X-axis direction or rotated clockwise in the X-axis direction.
Therefore, by disposing the positions of the first to fourth auxiliary coils 17A to 17D in the Z-axis direction, the locking member 13 can be rotated around an axis orthogonal to the Z-axis.
Thus, in the lens driving device 10 according to the present invention, the driving coil 15 is energized even when the lens holder 12 is in contact with the protruding portion 13T of the locking member 13 without energizing the driving coil 15. Even when the lens holder 12 is away from the protrusion 13T of the locking member 13, the lens direction can be controlled by controlling the direction and magnitude of the current supplied to the first to fourth auxiliary coils 17A to 17D. The holder 12 can be moved in the XY plane or rotated around an axis orthogonal to the Z axis.

In the first embodiment, the upper side of the first to fourth auxiliary coils 17A to 17D is in the vicinity of the upper end portion of the first to fourth magnets 16A to 16D, and the lower side is set to the first to first sides. Although the locking member 13 is moved in the XY plane or rotated around an axis orthogonal to the Z axis by being positioned in the vicinity of the lower ends of the four magnets 16A to 16D, the left and right sides (Z axis direction 1) to the left and right ends of the first to fourth magnets 16A to 16D and energized, the upper side and the lower side of the first to fourth auxiliary coils 17A to 17D However, even if the first to fourth magnets 16A to 16D are not near the lower ends, the locking member 13 can be swung in the XY plane.
In addition, each side of the first to fourth auxiliary coils 17A to 17D does not necessarily have to be positioned near the end of the first to fourth magnets 16A to 16D, only the upper side, only the lower side, or left and right Only the side may be positioned near the ends of the first to fourth magnets 16A to 16D.
In the above example, the first to fourth magnets 16 </ b> A to 16 </ b> D magnetized in the direction perpendicular to the plate surface are used as the drive magnets 16, but as shown in FIG. The same effect can be obtained even if the lens driving device 10T having the configuration using the triangular columnar magnets 16a to 16d arranged so that all the sides facing each other with the same polarity (N pole in this case) are used. it can. In this case, instead of the case 14, a case 14T obtained by rotating the case 14 by 45 ° so that the position of the apex when viewed from the + Z axis is on the X axis and the Y axis may be used.
In the above example, the locking spring members 19A and 19B are arranged on the upper and lower sides of the case 14, but only one of the upper and lower sides may be provided.

Further, as shown in FIG. 6, if a lens driving device 10Y having a configuration in which a magnetic yoke 23 is disposed outside each of the first to fourth magnets 16A to 16D constituting the driving magnet 16 is used, it is for auxiliary driving. Since the strengths of the upward and downward magnetic fields applied to the upper and lower sides of the first to fourth auxiliary coils 17A to 17D constituting the coil 17 can be increased, the lens holder 12 can be efficiently moved in the XY plane. It can be moved or rotated around an axis perpendicular to the Z axis.
FIG. 7A is a diagram showing the relationship between the magnet 16j (any one of the first to fourth magnets 16A to 16D) and the magnetic yoke 23 when viewed from the X-axis direction or the Y-axis direction. The yoke 23 includes a plate-like horizontal piece 23a that covers the + Z side and the −Z side of the magnet 16j, and a plate-like vertical piece 23b that covers the + X side and the −X side or the + Y side and the −Y side, respectively. It is a box-shaped member that opens on the side of the magnet 16j provided, and the horizontal piece 23a and the vertical piece 23b guide the magnetic field that spreads outward from the edge in the Z-axis direction of the magnet 16 into the magnetic yoke 23. The strength of the outward magnetic field applied to each of the four sides of the fourth auxiliary coils 17A to 17D can be increased.
As shown in FIG. 7B, a magnetic yoke 23K having a U-shaped cross section in which the vertical piece 23b is omitted may be used.
Further, depending on the arrangement and size of the drive magnet 16 and the auxiliary drive coil 17, as shown in FIG. 6, a spacer 16N is provided from a non-magnetic material between the drive magnet 16 and the magnetic yoke 23. It is preferable to adjust the strengths of the upward and downward magnetic fields applied to the upper and lower sides of the first to fourth auxiliary coils 17A to 17D, respectively.
In the first embodiment, the camera module substrate 21 on which the image sensor 22 is mounted is attached to the case 14, but these may be attached to the locking member 13.

Embodiment 2. FIG.
In the first embodiment, the auxiliary driving coil 17 is provided on the locking member 13 so that the locking member 13 is moved in the XY plane or rotated around an axis orthogonal to the Z axis. As shown in a), (b) and FIG. 9, as the driving coil, first to fourth driving coils 25A to 25D wound around the X axis and the Y axis are used, and a driving magnet is used. The first to fourth upper magnets 26A to 26D arranged on the + Z side and the first to fourth lower magnets 27A to 27D having different polarities from the first to fourth upper magnets 26A to 26D. Is used, the locking member 13 can be swung in the XY plane or rotated around an axis orthogonal to the Z axis without using the auxiliary driving coil 17.
In the lens driving device 10D, the lens holder 12 is suspended and supported on the locking member 13 by the driving spring members 18A and 18B on the upper side and the lower side, and the locking member 13 is on the lower side and on the lower side. The case 14 is suspended and supported by a stop spring member 19B.

Specifically, the upper side and the lower side of the first to fourth drive coils 25 </ b> A to 25 </ b> D are formed in an arc shape so that the shape on the lens holder 12 side is along the peripheral surface of the lens holder 12. Installed.
The first driving coil 25A is mounted on the + X side of the lens holder 12, and the second driving coil 25B is mounted on the −X side of the lens holder 12. The third driving coil 25C is mounted on the + Y side of the lens holder 12, and the fourth driving coil 25D is mounted on the −Y side of the lens holder 12.
The first to fourth upper magnets 26A to 26D are magnetized in a direction perpendicular to the plate surface, and are arranged so as to face the upper sides of the first to fourth driving coils 25A to 25D with a gap therebetween, respectively. Is done. On the other hand, the first to fourth lower magnets 27A to 27D are magnetized to have opposite polarities to the first to fourth upper magnets 26A to 26D, respectively, and the first to fourth driving coils 25A to 25A to 25D, respectively. It arrange | positions so that the space | interval may be opposed to the lower side of 25D.
In this example, the first to fourth upper magnets 26A to 26D are arranged so that the surfaces on the first to fourth drive coils 25A to 25D side are all N poles, and the first to fourth lower magnets are arranged. The side magnets 27 </ b> A to 27 </ b> D are arranged so that the surfaces on the first to fourth drive coils 25 </ b> A to 25 </ b> D side are all S poles.

Next, the operation of the lens driving device 10D according to the present invention will be described.
In the case of performing auto-focus driving for moving the lens holder 12 in the subject direction (Z-axis direction), a current counterclockwise in the X-axis direction is supplied to the first driving coil 25A and X is supplied to the second driving coil 25B. By flowing an axial clockwise current, or by passing a Y-axis counterclockwise current through the third drive coil 25C and a Y-axis clockwise current through the fourth drive coil 25D, The lens holder 12 can be moved to the subject side + Z side.
That is, a magnetic field directed toward the lens holder 12 is applied to the upper sides of the first to fourth drive coils 25A to 25D, and a magnetic field directed to the case 14 is applied to the lower sides, respectively. X-axis counterclockwise current for the coil 25A, X-axis clockwise current for the second drive coil 25B, and Y-axis counterclockwise current for the third drive coil 25C. If a current clockwise in the Y-axis direction is supplied to the fourth driving coil 25D, an upward Lorentz force can be generated in each of the first to fourth driving coils 25A to 25D.
In order to move the lens holder 12 to the -Z side, the energization directions of the first to fourth drive coils 25A to 25D may be reversed.

On the other hand, in order to suppress camera shake, current is supplied to one or more of the first to fourth drive coils 25A to 25D.
For example, if a current counterclockwise in the X-axis direction is supplied to the first and second drive coils 25A and 25B, the lens holder 12 is in contact with the protruding portion 13T of the locking member 13 and is rotated around the Y-axis. Can be rotated to the left.
Further, an X-axis direction counterclockwise current is supplied to the first drive coil 25A, and an X-axis direction clockwise rotation having a magnitude different from the current supplied to the second drive coil 25B is supplied to the first drive coil 25A. If the current is applied, the lens holder 12 can be rotated around the Y axis while moving to the + Z side. If the current flowing through the first driving coil 25A is larger than the current flowing through the second driving coil 25B, the lens holder 12 rotates to the left around the Y axis while moving to the + Z side, and if smaller, moves to the + Z side. While rotating right around the Y axis.

Similarly, if a current counterclockwise in the Y-axis direction is supplied to the third and fourth drive coils 25C and 25D, the X-axis is in a state where the lens holder 12 is in contact with the protruding portion 13T of the locking member 13. Can rotate right around.
Also, a Y-axis counterclockwise current is passed through the third drive coil 25C, and a Y-axis clockwise run of a magnitude different from the current passed through the fourth drive coil 25D through the third drive coil 25C. When the current is applied, the lens holder 12 can be rotated around the X axis while moving to the + Z side. If the current flowing through the third driving coil 25C is larger than the current flowing through the fourth driving coil 25D, the lens holder 12 rotates to the right around the X axis while moving to the + Z side, and if smaller, around the X axis. Rotate left.
In this way, if the direction and magnitude of the current applied to one or more of the first to fourth drive coils 25A to 25D are appropriately controlled, the lens holder 12 will contact the protruding portion 13T of the locking member 13. The lens holder 12 can be rotated around an axis orthogonal to the Z axis, whether in contact or not.

Embodiment 3 FIG.
In the first and second embodiments, the lens holder 12 is suspended and supported on the locking member 13 by the upper and lower driving spring members 18A and 18B. However, as shown in FIG. (Here, the lower drive spring member 18B) is suspended and supported by the locking member 33, and the other drive spring member (here, the upper drive spring member 18A) is suspended and supported by the case 34. Even when the lens driving device 30 is used, the lens holder 12 is rotated about an axis orthogonal to the Z-axis regardless of whether the lens holder 12 is in contact with the protruding portion 33T of the locking member 33 or away from the protruding portion 33T. Can be made.
The lens driving device 30 includes a lens holder 12 that holds the lens 11, a locking member 33, a case 34, a driving coil 15, a driving magnet 16, an auxiliary driving coil 35, and an auxiliary driving magnet 36. And driving spring members 18A and 18B and a locking spring member 19B. As shown in FIG. 10, an image sensor 22 and current control means (not shown) are mounted on or connected to the electromagnetic drive device 30 to control photographing of a subject, driving of the lens holder 12, and suppression of camera shake.
The members constituting the lens driving device 30 that are the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The locking member 33 is disposed on the opposite side to the subject side of the lens holder 12 and has a cylindrical protruding portion 33T that contacts the lens holder 12, and a disc-shaped flange that protrudes in the radial direction from the peripheral surface of the protruding portion 33T. A portion 33a and an auxiliary coil mounting portion 33b provided on the outer edge portion of the flange 33a for mounting the auxiliary driving coil 35 are provided.
The locking member 33 suspends and supports the lens holder 12 so as to be movable to the subject side + Z side by the driving spring member 18B on the inner peripheral side of the auxiliary coil mounting portion 33b, and by the protruding portion 33T, The lens holder 12 is offset by P ₀ to the + Z side. Therefore, the lens holder 12 is always biased by a downward pulling force by the restoring force of the driving spring member 18B.
The case 34 is a box-like member having an opening at the bottom and an open upper side. The drive magnets 16 are provided at locations facing the drive coils 15 on the inside of the four side surfaces orthogonal to the X axis or the Y axis. The first concave portion 34a for holding the auxiliary drive magnet 36 is formed, and the first drive magnet 36 for attaching the auxiliary drive magnet 36 to each of the portions facing the auxiliary drive coil 35 attached to the auxiliary coil attachment portion 33b of the locking member 33 is formed. Two recesses 34b are formed.
The case 34 is disposed outside the locking member 33, and the locking spring member 19B suspends and supports the locking member 33 on the lower end side of the protruding portion 33T so as to be able to swing, and the driving spring member 18A. Thus, the lens holder 12 is suspended and supported so as to be movable toward the subject side + Z side.

The auxiliary driving coil 35 includes first and second auxiliary coils 35A and 35B which are wound around the X axis and are arranged on the + X side and the −X side of the auxiliary coil mounting portion 33b.
The auxiliary driving magnet 36 is provided so as to face the first auxiliary coil 35A with a gap therebetween, and the first auxiliary magnet 36A provided with a gap therebetween. And a second auxiliary magnet 36B. Each of the first and second auxiliary magnets 36A, 36B includes an upper magnet 36U disposed on the upper side and a lower magnet 36D having a polarity different from that of the upper magnet 36U and disposed on the lower side of the upper magnet 36U. Provided, the upper magnet 36U is disposed at a position facing the upper sides of the first and second auxiliary coils 35A, 35B, and the lower magnet 36D is disposed at a position facing the lower sides of the first and second auxiliary coils 35A, 35B. Be placed.

Next, the operation of the lens driving device 30 will be described.
When the lens holder 12 is automatically focused, the driving coil 15 is energized to move the lens holder 12 in the Z-axis direction as in the first embodiment.
On the other hand, in order to suppress camera shake, for example, a current flowing counterclockwise in the X-axis direction is passed through the first and second auxiliary drive coils 35A and 35B, and an upward Lorentz is supplied to the first auxiliary drive coil 35A. If a force is generated to generate a downward Lorentz force in the second auxiliary driving coil 35B, the lens holder 12 can be rotated to the left around the Y axis.
That is, a magnetic field in the −X direction is applied to the upper side of the first auxiliary driving coil 35A from the upper magnet 36U of the first auxiliary magnet 36A, and the lower side 36D of the first auxiliary magnet 36A is applied to + X. Since a directional magnetic field is applied, upward torque acts on the first auxiliary driving coil 35A. On the other hand, a magnetic field in the + X direction is applied from the upper magnet 36U of the second auxiliary magnet 36B to the upper side of the second auxiliary driving coil 35B, and -X from the lower magnet 36D of the second auxiliary magnet 36A to the lower side. Since a directional magnetic field is applied, a downward torque acts on the second auxiliary driving coil 35B. As a result, the lens holder 12 rotates counterclockwise around the Y axis.
On the other hand, when a clockwise current in the X-axis direction is passed through the first and second auxiliary drive coils 35A and 35B, a downward Lorentz force acts on the first auxiliary drive coil 35A, and the second auxiliary drive Since an upward Lorentz force acts on the coil 35B, the lens holder 12 rotates clockwise around the Y axis.
In order to rotate the lens holder 12 around the X axis, it corresponds to a set of the first auxiliary coil 35A and the first auxiliary magnet 36A, and a set of the second auxiliary coil 35B and the second auxiliary magnet 36B. Positions of the auxiliary coil and auxiliary magnet to be rotated by 90 ° with respect to the first and second auxiliary coils 35A and 35B and the first and second auxiliary magnets 36A and 36B (+ Y side and −Y side) ) May be arranged.
Further, an auxiliary coil wound around the X axis is disposed in the X axis direction, and an auxiliary coil wound around the Y axis is disposed in the Y axis direction, and is opposed to the auxiliary coil of the case 34. If an auxiliary magnet having an upper magnet and a lower magnet similar to the upper magnet 36U and the lower magnet 36D is arranged at the position, the lens holder 12 can be rotated around an axis orthogonal to the Z axis.

In FIG. 11, the lens holder 12 is energized by energizing the driving coil 15 and energizing the first and second auxiliary driving coils 35 </ b> A and 35 </ b> B in a state where the lens holder 12 is separated from the protrusion 33 </ b> T of the locking member 33. It is a figure which shows the example which rotated.
When the first and second auxiliary driving coils 35A and 35B are energized when the lens holder 12 floats, the Lorentz force generated in the first and second auxiliary driving coils 35A and 35B becomes torque and the lens holder 12 can be rotated.
On the other hand, even if the first and second auxiliary driving coils 35A and 35B are energized while the lens holder 12 is in contact with the protruding portion 33T of the locking member 33 without energizing the driving coil 15, the lens Since the holder 12 is biased toward the locking member 33, the lens holder 12 can be rotated while contacting the locking member 33 as shown in FIG. 12.

In the third embodiment, as the first and second auxiliary magnets 36A and 36B, auxiliary magnets having an upper magnet 36U and a lower magnet 36D are used. However, as shown in FIG. As a device, instead of the first and second auxiliary magnets 36A and 36B, a third auxiliary having the same polarity as that of the driving magnet 16 at a position facing the lower sides of the first and second auxiliary driving coils 35A and 35B. A lens driving device 30Y having a configuration in which a magnet 36C is disposed and a magnetic yoke 38 having a convex portion 38a is provided may be used.
The convex portion 38a of the magnetic yoke 38 extends from the plate-like base portion 38b extending from the case 34 side of the driving magnet 16 to the case 34 side of the third auxiliary magnet 36C, and the first and second auxiliary driving coils 35A and 35B. It is provided so as to protrude to the side.
The lower end of the convex portion 38a is in contact with the upper surface of the third auxiliary magnet 36C, and the upper end is located above the upper sides of the first and second auxiliary driving coils 35A and 35B.
Thus, as in the third embodiment, a magnetic field in the + X direction is applied to the upper side of the auxiliary driving coil 35A, a magnetic field in the -X direction is applied to the lower side, and the upper side of the auxiliary driving coil 35B. Since a magnetic field in the −X direction is applied to and a magnetic field in the + X direction is applied to the lower side, the lens holder 12 can be rotated around the Y axis.
In this example, a spacer 39 is provided between the upper surface of the convex portion 38a of the magnetic yoke 38 and the lower surface of the driving magnet 16 so as to support the driving magnet 16 from the lower side.

FIGS. 14A and 14B are views showing an example of a lens driving device 40 using an auxiliary driving coil wound around the Z axis, and FIG. 14A is a view when viewed from the −Y side. A longitudinal sectional view, (b) is a longitudinal sectional view when viewed from the -X side. FIG. 15 is a diagram showing the relationship between auxiliary driving coils and auxiliary magnets used in the lens driving device 40. In the lens driving device 40, instead of the first and second auxiliary driving coils 35A and 35B. The locking member 33 includes the upper auxiliary driving coil 45U wound around the Z axis and the lower auxiliary driving coil 45D wound around the Z axis and disposed below the upper auxiliary driving coil 45U. First and second upper auxiliary magnets that are mounted and magnetized in the same direction (here, the -X direction) on the + X side and the -X side of the case 34 facing the upper auxiliary driving coil 45U. 46A and 46B are disposed, and the first and second magnets magnetized in the same direction (here, the + Y direction) on the + Y side and the −Y side at positions facing the lower auxiliary driving coil 45D of the case 34, respectively. Lower auxiliary magnet Stones 46C and 46D are arranged.
The center position in the Z direction of the first and second upper auxiliary magnets 46A and 46B and the center position in the Z direction of the first and second lower auxiliary magnets 46C and 46D are as shown in FIG. It is separated by a distance h corresponding to the difference between the center position of the drive coil 45U and the center position of the lower auxiliary drive coil 45D.

By adopting such a configuration, when a current in the clockwise direction around the Z-axis is passed through the upper auxiliary driving coil 45U, an upward Lorentz force is generated on the first upper auxiliary magnet 46A side of the upper auxiliary driving coil 45U. Since a downward Lorentz force is generated on the second upper auxiliary magnet 46B side, the lens holder 12 rotates counterclockwise around the Y axis. Conversely, when a counterclockwise current around the Z axis is passed through the upper auxiliary driving coil 45U, the lens holder 12 rotates clockwise around the Y axis.
On the other hand, when a clockwise current around the Z-axis is passed through the lower auxiliary driving coil 45D, a downward Lorentz force is generated on the first lower auxiliary magnet 46C side of the lower auxiliary driving coil 45D. Since an upward Lorentz force is generated on the lower auxiliary magnet 46D side, the lens holder 12 rotates counterclockwise around the X axis.
When a counterclockwise current around the Z axis is passed through the lower auxiliary drive coil 45D, the lens holder 12 rotates clockwise around the X axis.
Therefore, the lens holder 12 can be rotated about an axis orthogonal to the Z axis by appropriately controlling the direction and magnitude of the current supplied to the upper auxiliary driving coil 45U and the lower auxiliary driving coil 45D.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

10 lens driving device, 11 lens, 12 lens holder, 13 locking member,
14 cases, 15 driving coils, 16 driving magnets, 17 auxiliary driving coils,
18A, 18B Driving spring member, 19A, 19B Locking spring member,
21 Camera module board, 22 Image sensor.

Claims (6)

A lens holder for holding the lens, a driving coil wound around the outer periphery of the lens holder, a case as a fixing member, and held by the case so as to face the driving coil with a gap. A lens driving device including a driving magnet disposed;
A locking member disposed on the side opposite to the subject side of the lens holder and contacting the lens holder;
The locking member is suspended and supported by a locking spring member so as to be swingable with respect to the case,
A lens driving device characterized in that the lens holder is movable to the subject side with respect to the locking member by a driving spring member, and is urged toward the opposite side of the subject side to be suspended and supported.   The lens driving device according to claim 1, wherein an auxiliary driving coil is attached to the locking member.   The lens driving device according to claim 2, wherein the auxiliary driving coil is disposed in the driving magnet with a gap.   The lens driving device according to claim 2, further comprising an auxiliary driving magnet disposed in the auxiliary driving coil with a gap.   The lens driving device according to claim 4, wherein a magnetic yoke is disposed outside the auxiliary driving magnet. When the subject side is the front in the Z-axis direction,
The driving coil includes at least one pair of coils provided so as to face each other across the lens holder and wound in a direction perpendicular to the Z-axis direction,
The drive magnet includes a first magnet disposed forward in the Z-axis direction, and a second magnet having a polarity different from that of the first magnet and disposed rearward in the Z-axis direction. The lens driving device according to claim 1, wherein:

Images