JP6079974B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device suitably used for a camera module of a mobile phone, for example.

  In a lens driving device suitably used for a camera module of a cellular phone, a device for correcting a shake by moving a shake correction movable unit including a lens holder that holds a lens in a direction perpendicular to the optical axis has been developed. (For example, the following patent document 1). In order to perform the blur correction by moving the blur correction movable unit in the direction perpendicular to the optical axis, the base portion includes a part of the first drive unit having the first drive shaft and the second drive shaft having the second drive shaft. And a part of the drive unit.

  The base is formed with an opening into which at least a part of the lens held by the lens holder is inserted. In the conventional apparatus, the opening of the base portion is formed in a circular shape in accordance with the outer diameter of the lens. Further, in order to move the lens in the direction perpendicular to the optical axis with respect to the base portion, the inner diameter of the opening is made larger than the outer diameter of the lens inserted into the opening.

  The outer shape of the base portion is preferably as small as possible in order to reduce the size of the apparatus. Therefore, if the inner diameter of the opening formed in the base portion is excessively increased, the distance between the outer shape of the base portion and the opening portion is reduced, and there is no gap for arranging the drive unit on the base portion. . Therefore, the inner diameter of the opening is preferably set to the minimum necessary size in accordance with the outer diameter of the lens.

  Therefore, it is conceivable to design the inner diameter of the opening of the base portion so as to ensure the maximum movement amount of the lens in the first drive axis direction or the maximum movement amount of the lens in the second drive axis direction. With such a design, when the lens moves only in the first drive axis direction or the second drive axis direction, there is no possibility that the lens collides with the opening edge of the opening.

  However, the lens does not move only in the first drive shaft direction or the second drive shaft direction, but also moves in an oblique direction located, for example, between the first drive shaft and the second drive shaft. In the oblique direction, the lens moves with a movement vector corresponding to the sum of the movement vector along the first drive axis and the movement vector along the second drive axis.

  For this reason, the amount of movement of the lens in the oblique direction is about √2 times (about 1.44 times) as much as the amount of movement along the first drive shaft or the second drive shaft. In the worst case, the lens may collide with the opening edge of the base portion. When the lens collides with the opening edge of the base portion, the lens may be damaged, and there is a risk that inconveniences such as a reduction in blur correction quality due to an impact at the time of the collision may occur.

  In order to avoid such a problem, an opening having an inner diameter larger than necessary with respect to the diameter of the lens is formed in the base portion. For this reason, it is difficult to downsize the outer shape of the base portion, and as a result, downsizing of the device has to be sacrificed.

JP 2011-65140 A

  The present invention has been made in view of such a situation, and an object thereof is to provide a lens driving device that can reduce the size of the device and that is less likely to cause the lens to collide with the opening edge of the base portion. It is.

In order to achieve the above object, a lens driving device according to the present invention includes:
A lens portion including at least one lens;
A first drive unit that moves the lens unit relative to a base unit along a first drive axis perpendicular to the optical axis of the lens;
A second drive unit that moves the lens unit relative to the base unit along a second drive axis that is perpendicular to the optical axis of the lens and intersects the first drive axis. There,
In the base portion, an opening is formed in which a part of the lens is inserted movably along a driving plane including the first driving shaft and the second driving shaft.
An oblique inner diameter of the opening in the oblique direction located between the first drive shaft and the second drive shaft is larger than a first inner diameter of the opening in the first drive shaft direction, and the opening of the opening It is characterized by being larger than the second inner diameter in the second drive shaft direction.

  In the lens drive device according to the present invention, the oblique inner diameter of the oblique opening located between the first drive shaft and the second drive shaft is larger than the first inner diameter of the opening in the first drive shaft direction, and the opening. Larger than the second inner diameter in the direction of the second drive shaft. With this configuration, not only when the lens moves in the first drive axis direction or the second drive axis direction, but also when the lens moves in an oblique direction between them, the lens is positioned at the opening edge of the opening. There is no risk of collision.

  Moreover, in the lens driving device according to the present invention, the opening formed in the base portion is not a perfect circle, and the deformed shape has a larger inner diameter in the oblique direction located in the middle than the first driving shaft direction or the second driving shaft direction. It has a shape. Therefore, the outer shape of the base portion can be reduced as compared with a perfect circular opening that takes into account the maximum amount of movement in an oblique direction, which contributes to downsizing of the apparatus.

  Alternatively, when the outer shape of the base portion is assumed to be the same, in the present invention, along the first drive shaft and the second drive shaft, compared to a perfect circular opening that takes into account the maximum amount of movement in the oblique direction. The width of the base portion can be increased. Therefore, it is possible to increase the number of turns of the coils that constitute part of the first drive unit and the second drive unit, thereby improving the driving force and improving the accuracy of blur correction.

Preferably, the first drive unit includes a pair of first drive coils positioned on both sides of the opening along the first drive axis direction,
The pair of first drive coils are arranged in parallel along two opposing sides of the base portion.

  With this configuration, the driving force along the first drive axis direction is improved, and the accuracy of blur correction is improved.

Preferably, the second drive unit includes a pair of second drive coils positioned on both sides of the opening along the second drive axis direction,
The pair of second drive coils are arranged in parallel along two opposing sides of the base portion.

  With this configuration, the driving force along the second drive axis direction is improved, and the accuracy of blur correction is improved.

Preferably, the lens unit is held by the frame so as to be movable in the optical axis direction.
Using a plurality of suspension wires, the frame is held movably along the drive plane with respect to the base portion.

  By comprising in this way, a lens part can be freely moved along a drive plane with respect to a base part.

Preferably, the frame has a rectangular ring shape as a whole, and is disposed inside a rectangular tube-shaped case fixed to the base.
The oblique direction substantially coincides with the diagonal direction of the square ring shape.

  By configuring in this way, it becomes possible to efficiently arrange a part of the first drive part and a part of the second drive part on the base part excluding the opening, and the outer shape of the base part can be reduced. This makes it possible to reduce the size of the apparatus.

Preferably, a cylindrical convex portion is formed on the base portion along the opening edge of the opening portion,
At least a part of the first driving unit and the second driving unit is disposed around the cylindrical convex portion.

  By configuring in this way, it is possible to effectively prevent the lens from colliding with at least a part (drive coil) of the first drive unit and the second drive unit arranged around the cylindrical convex portion. Further, the presence of the cylindrical convex portion makes it difficult for dust or the like existing on the surface of the base portion to enter the opening. A lens is passed through the opening, and an image sensor or the like is disposed at a position away from the lens in the optical axis direction. If dust or the like adheres to the image sensor, the quality of the image to be captured may be reduced, and it is preferable that dust or the like does not enter the opening.

FIG. 1A is an overall perspective view of a lens driving device according to an embodiment of the present invention. FIG. 1B is an overall perspective view showing the inside of the lens driving device excluding the case shown in FIG. 1A. FIG. 1C is an overall perspective view of the lens driving device excluding the case shown in FIG. 1B as seen from different angles. FIG. 1D is a partially enlarged schematic view showing a damper material filled between a rear surface of the frame shown in FIG. 1C and a damper base. FIG. 2 is an exploded perspective view of the lens driving device excluding the case shown in FIG. 1A. FIG. 3A is a perspective view of the lens holder shown in FIG. FIG. 3B is a perspective view of the lens holder shown in FIG. 3A viewed from different angles. 4A is a perspective view of the frame shown in FIG. FIG. 4B is a perspective view of the frame shown in FIG. 4A viewed from a different angle. FIG. 4C is a perspective view in which the frame and the lens holder shown in FIG. 2 are combined. FIG. 4D is a partially enlarged view of the main parts of the frame and lens holder shown in FIG. 4C. FIG. 4E is a partially enlarged view of the main part of only the frame shown in FIG. 4C. FIG. 4F is a partially enlarged view of the main part of only the lens holder shown in FIG. 4C. 5A is a plan view in which the circuit board and the drive coil are arranged on the base portion shown in FIG. 2, FIG. 5B is a plan view of the first drive coil shown in FIG. 5A, and FIG. FIG. 5C is a plan view of the second drive coil shown in FIG. FIG. 6A is a perspective view of a partially assembled view in which a circuit board and a drive coil are arranged on the base portion shown in FIG. FIG. 6B is an enlarged plan view of FIG. 5A and shows the relationship between the lens and the opening. FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. 6B, and is a cross-sectional view in which a frame and a lens holder are also combined at the upper part in the Z-axis direction of the partially assembled view shown in FIG. 6B.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
As shown in FIG. 1A, a lens driving device 2 according to an embodiment of the present invention includes a base portion 10 and a case 11 as fixed portions. The base 10 and the case 11 are joined at the rear open end of the case 11 in the Z-axis direction. As shown in FIGS. 1B and 2, a circuit board 20 made of FPC, a lens holder 40, and a frame 60 are arranged inside the case 11 toward the front of the base portion 10 in the Z-axis direction. is there. The lens holder 40 and the frame 60 constitute a movable part with respect to the fixed part.

  The circuit board 20 is formed with a substrate opening 22 penetrating the front and back surfaces at the center thereof. A cylindrical convex portion 14 formed in the central portion of the base portion 10 is inserted into the substrate opening portion 22. The cylindrical convex portion constitutes the opening edge of the base opening 12. On the front surface (front surface) of the circuit board 20, a shake correction coil 30 is mounted along the periphery of the board opening 22. The circuit board 20 is integrated with the base portion 10 to constitute a part of the fixed portion.

  The blur correction coils 30 include a pair of first drive coils 30a that constitute a first drive shaft, which will be described later, and a pair of second drive coils 30b that constitute a second drive shaft that intersects the first drive shaft at a substantially right angle. Have These drive coils 30a and 30b are fixed to the surface of the circuit board 20 with an adhesive or the like.

  The circuit board 20 has a rectangular plate shape as a whole, and a connector portion 23 for connecting to an external circuit is formed on one side of the rectangular outer shape. In all the drawings, the direction parallel to the optical axis of the lens 100 (see FIG. 7) fixed to the inner peripheral surface of the lens holder 40 is taken as the Z axis, and the directions perpendicular to the optical axis are taken as the X axis direction and the Y axis. The direction is described.

  The X axis, Y axis, and Z axis are perpendicular to each other. In the present embodiment, the X axis coincides with the first drive axis, and the Y axis coincides with the second drive axis. Further, the front surface or the front side along the Z-axis means an upward direction in FIGS. 2 and 7, and means a subject side with respect to the lens. Further, the rear surface or the rear side along the Z-axis means a downward direction in FIGS. 2 and 7 and means the image sensor side with respect to the lens.

  As shown in FIG. 2, the base portion 10 includes a base plate main body 10a and wire rear end mounting pieces 10b attached to the four corners of the base plate main body 10a. A rear end of a single suspension wire 16 is attached to each wire rear end attachment piece 10b. The suspension wires 16 extend from the four corner portions of the base portion 10 through the four corner portions of the circuit board 20 toward the front in the Z-axis direction (upward in FIG. 2).

  Holder attachment portions 93a to 93d of the front spring 90 are attached and fixed to the front surface 42 of the lens holder 40 shown in FIG. A sensor component 41 is attached to a part of the outer circumferential surface 47 of the lens holder 40 in the circumferential direction. The sensor component 41 is configured by, for example, a Hall IC component that detects a relative position of the lens holder 40 with respect to the frame 60 by detecting a relative movement with the Hall element (Hall magnet). A hall magnet (not shown) is attached to the inner surface of the frame 60 corresponding to the sensor component 41.

  As shown in FIGS. 1B and 2, the front spring 90 is composed of four plate-shaped split plate springs 90 a to 90 d that are separated from each other and insulated. Each of the split plate springs 90a to 90d has corner-shaped wire attachment portions 92a to 92d to which the front ends of the suspension wires 16 are attached. The suspension wire 16 and the split plate springs 90a to 90d are each made of a conductive material such as a metal, and these can be electrically connected to each other.

  The suspension wire 16 is freely bent and elastically deformable along drive planes including the X axis and the Y axis, respectively. The suspension wire 16 can be elastically deformed also in the Z-axis direction when an excessive force is applied, but in a normal lens driving operation, the suspension wire 16 includes the X-axis and the Y-axis, respectively. It flexes freely along the driving plane and elastically deforms. As shown in FIG. 4A, the front end of the suspension wire 16 is easily connected to the wire attachment portions 92a to 92d of the split plate springs 90a to 90d. 62 is provided.

  Each of the divided leaf springs 90a to 90d has frame attachment portions 94a to 94d that are continuous with the corner-shaped wire attachment portions 92a to 92d. Each frame attaching part 94a-94d is attached and fixed to four corner | angular parts located in the front surface 64 of the square ring-shaped flame | frame 60 shown, for example in FIG. 4A. The frame 60 itself is made of an insulating material such as plastic.

  A plurality of mounting convex portions 65 are preferably formed on the front surface 64 located at the corner of the frame 60. Each mounting convex portion 65 is fitted into a fitting hole formed in the frame mounting portions 94a to 94d of the split plate springs 90a to 90d shown in FIGS. 1B and 2, and the split plate springs 90a to 90d are framed. Position and fix to 60.

  Holder attachment portions 93a to 93d are formed on the frame attachment portions 94a to 94d of the divided plate springs 90a to 90d via meandering portions 95a to 95d, respectively. Each of the holder mounting portions 93a to 93d is formed with a fitting hole, and the fitting holes are formed substantially uniformly along the circumferential direction on the front surface 42 of the lens holder 40 also shown in FIG. 3A. It fits into the convex parts 43a-43d.

  That is, when the meandering portions 95a to 95d are elastically deformed, the front spring 90 is moved in the direction of the optical axis with respect to the frame 60 by the holder mounting portions 93a to 93d formed at the inner peripheral ends thereof. It is held movably in the Z-axis direction.

  In addition, each of the split plate springs 90 a to 90 d of the front spring 90 is connected to a separate suspension wire 16 and connected to a wiring pattern formed on the front surface of the lens holder 40. Therefore, it is possible to supply a drive current to the focusing coil 46 held by the lens holder 40 through the suspension wire 16 and the front spring 90 and to transmit a detection signal detected by the sensor component 41 to the circuit board 20. Yes. Each suspension wire 16 can be electrically connected to the wiring pattern of the circuit board 20.

  As shown in FIG. 3B, arc-shaped leaf spring mounting portions 44a and 44b are formed on the rear surface 45 of the lens holder 40. A stepped portion 49 is formed on the rear side of the outer peripheral surface 47 of the lens holder 40. A square ring-shaped focusing coil 46 shown in FIG. 2 is fixed to the step portion 49.

  As shown in FIG. 2, the rear spring 50 is composed of a pair of split leaf springs 50a and 50b. Each split leaf spring 50a, 50b is formed with arcuate holder mounting portions 54a, 54b on the inner periphery thereof. Each holder attaching part 54a, 54b is fixed to the leaf spring attaching part 44a, 44b shown in FIG. 3B. The means for fixing the rear spring 50 to the leaf spring mounting portions 44a and 44b is not particularly limited, and examples include fixing by fitting and fixing by an adhesive.

  As shown in FIG. 2, meandering portions 55a and 55b are formed on the split plate springs 50a and 50b of the rear spring 50 continuously from both end portions of the holder mounting portions 54a and 54b. Frame mounting portions 52a and 52b are formed continuously on the outer peripheral side of 55b. Each frame attachment portion 52a, 52b is fitted and fixed to the corner rear surface 68 of the frame 60.

  That is, the rear spring 50, like the front spring 90, causes the lens holder 40 to be attached to the frame 60 by the holder mounting portions 54a to 54d formed on the inner peripheral end when the meandering portions 55a to 55d are elastically deformed. On the other hand, it is held movably in the Z-axis direction, which is the optical axis direction. However, unlike the front spring 90, the rear spring 50 does not need to have a function of an electrical conduction path.

  As shown in FIGS. 4A and 4B, magnet mounting recesses 66 are formed along the four sides of the square on the rear side in the Z-axis direction of the square ring-shaped frame 60. As shown in FIG. 2 and FIG. 7, a dual-purpose magnet 80 is fixed to the magnet mounting recess 66 via a magnetic plate 61.

  As shown in FIG. 7, the frame 60 is held on the base portion 10 by the suspension wire 16 so that a gap is formed between the rear surface of the dual-purpose magnet 80 and the front surface of the shake correction coil 30. . The frame 60 is held movably along the driving plane including the X axis and the Y axis with respect to the base portion 10.

  Since the lens holder 40 is held on the frame 60 so as to be movable in the Z-axis direction via the front spring 90 and the rear spring 50 shown in FIG. And move along a driving plane including the X axis and the Y axis.

  By causing a drive current to flow through the blur correction coil 30, a force in the direction perpendicular to the optical axis acts on the dual-purpose magnet 80 due to the cooperative action of the coil 30 and the dual-purpose magnet 80. Therefore, the frame 60 can be moved along with the lens holder 40 along the drive plane including the X axis and the Y axis with respect to the base portion 10. By moving the lens 100 along with the lens holder 40 along the driving plane, a blur correction operation can be performed.

  The lens holder 40 is attached to the frame 60 via springs 90 and 50 (see FIG. 2) so that a gap is formed between the inner peripheral surface of the dual-purpose magnet 80 and the outer peripheral surface of the focusing coil 46. It is held in. By causing a driving current to flow through the focusing coil 46, a force in the optical axis direction acts on the coil 46 due to a cooperative action (VCM action) between the coil 46 and the dual-purpose magnet 80. Therefore, the lens holder 40 can be moved forward and backward in the optical axis direction together with the lens 100 with respect to the frame 60. By moving the lens 100 together with the lens holder 40 in the optical axis direction with respect to the frame 60, an autofocus (AF) operation can be performed.

  In the present embodiment, the dual-purpose magnet 80 serves as both an AF control magnet and a shake correction control magnet, so that the number of parts can be reduced, and AF control and shake correction control can be performed with a simple configuration. Become. In addition, the lens driving device 2 can be reduced in size.

  The lens 100 may be composed of a plurality of lens groups. However, in the present embodiment, the description will be made assuming that the lens 100 is composed of one lens for the sake of simplicity.

  As shown in FIGS. 6A and 6B, the blur correction coil 30 includes a pair of first drive coils 30a and 30a facing each other with the opening 12 in the X-axis direction and the opening 12 in the Y-axis direction. And a pair of second drive coils 30b, 30b facing each other. These drive coils 30a and 30b are arranged in parallel along each side of the circuit board 20 so as to surround the cylindrical convex portion 14 on the front surface of the circuit board 20 having a square plate shape as a whole.

  The positions of the first drive coils 30a, 30a facing each other along the X axis are slightly shifted in the Y axis direction, and the second drive coils 30b, 30b facing each other along the Y axis. The arrangement position in the X-axis direction is also slightly shifted. In this way, the drive coils 30a and 30b are displaced in the same direction along the circumferential direction in order to make it easy to mount the position sensors 18a and 18b, the damper base 24 and the like at the four corners of the circuit board 20. This is to facilitate the formation of a through hole or the like of the suspension wire 16.

  The position sensor 18a is constituted by a Hall sensor, for example, and faces the rear surface of one first drive magnet 80a of the dual-purpose magnet 80 shown in FIG. 2 together with one first drive coil 30a at a predetermined interval. The moving position in the X-axis direction can be detected. Further, the position sensor 18b is composed of, for example, a Hall sensor, and faces the rear surface of one second drive magnet 80b of the dual-purpose magnet 80 shown in FIG. 2 together with one second drive coil 30b at a predetermined interval. The movement position in the Y-axis direction of 80b can be detected. These sensors 18 a and 18 b are electrically connected to the wiring pattern of the circuit board 20.

  In the present embodiment, the first drive coil 30a and the first drive magnet 80a are arranged at a predetermined interval along the Z-axis direction to constitute a first drive unit (first VCM) for blur correction, and the second The drive coil 30b and the second drive magnet 80b are arranged at a predetermined interval along the Z-axis direction and constitute a second drive unit (second VCM) for blur correction. The first drive axis of the first drive unit is the X axis, and the second drive axis of the second drive unit is the Y axis.

  The damper base 24 shown in FIGS. 6A and 6B is fixed to the four corners of the circuit board 20 by means such as adhesive or reflow. As shown in FIG. 1C and FIG. 1D, a gap having a gap width W1 is formed between the front surface of the damper base 24 and the corner rear surface 68 or the rear surface convex portion 69 of the frame 60. A gel-like first damper material 70a is interposed so as to be in close contact with both. The gap width W1 is larger than the gap width W0 between the dual-purpose magnet 80 and the shake correction coil 30, and specifically, about 0.1 to 0.4 mm is preferable.

  The first damper material 70a is made of, for example, a vibration absorbing material such as a soft gel material or a soft adhesive. The first damper material 70a functions as a damper when the frame 60 moves along the drive plane including the X axis and the Y axis with respect to the base 10 and the circuit board 20, and an effect of suppressing vibration can be expected. .

  In the present embodiment, the first damper material 70a is not provided between the magnet 80 and the coil 30, but between the damper base 24 and the corner rear surface 68 of the frame 60, or the rear convex portion 69 of the damper base 24 and the frame 60. It is interposed between. Moreover, the gap width W1 is larger than W0. For this reason, in this embodiment, even if an impact such as a drop of a portable device including the lens driving device 2 is applied, the stopper function functions by the collision between the magnet 80 and the coil 30. Therefore, the first damper material 70a is held between the damper base 24 and the corner rear surface 68 of the frame 60, or between the damper base 24 and the rear surface convex portion 69 of the frame 60. The damper characteristics can be maintained well even after impact.

  Moreover, in this embodiment, as shown to FIG. 4A-FIG. 4E, the inward convex part 72 which protrudes inside is formed in each inside of the four corner | angular parts of the flame | frame 60. FIG. As shown in FIG. 4d, the width W2 of the gap between the inward convex portion 72 and the outer peripheral surface 47 of the lens holder 40 is preferably 0.1 to 0.3 mm. The gap portion of the width W2 is filled with the second damper material 70b, and the second damper material 70b is in close contact with the inward convex portion 72 and the outer peripheral surface 47 of the lens holder 40 in this gap. . The second damper material 70b is made of the same material as the first damper material 70a, but is not necessarily the same.

  As shown in FIG. 4E, a damper recess 74 is formed on the front surface 73 of the inward projection 72. The second damper material 70b is also continuously filled with the gap in the damper recess 74. The damper recess 74 is filled with the second damper material 70b continuously with the gap, so that the damper recess 74 becomes a gel pool, and even if an impact is applied to the lens driving device 2, the second damper is provided. There is little possibility that the material 70b falls out of the gap.

  The second damper material 70b functions as a damper when the lens holder 40 is focus-driven with respect to the frame 60 in the optical axis direction (Z-axis direction), and an effect of suppressing vibration can be expected. In the present embodiment, by providing the second damper material 70b near the four corners of the rectangular frame 60, the four damper materials 70b can be arranged at the farthest position from the center axis of the lens. Thus, the function as a damper can be maximized. As shown in FIG. 4C, one of the four damper members 70 b is provided between the sensor component 41 attached to a part of the outer peripheral surface of the lens holder 40 and the inner peripheral surface of the frame 60. It may be provided in the gap.

  In the present embodiment, as shown in FIG. 6B, a part of the lens 100 is moved along the drive plane including the first drive axis (X axis) and the second drive axis (Y axis) in the base unit 10. An opening 12 to be inserted is formed. In the present embodiment, the oblique inner diameters Dxy1 and Dxy2 of the oblique opening 12 located between the first drive shaft (X-axis) and the second drive shaft (Y-axis) are the first in the X-axis direction of the opening 12. It is larger than the first inner diameter Dx and larger than the second inner diameter Dy of the opening 12 in the Y-axis direction.

  In the present embodiment, the first inner diameter Dx and the second inner diameter Dy are substantially equal. The oblique inner diameters Dxy1 and Dxy2 are substantially equal to each other. The oblique inner diameters Dxy1 and Dxy2 have the maximum length near the bisector of the intersection angle between the straight line along the first inner diameter Dx and the straight line along the second inner diameter Dy, and the first inner diameter Dx or second It approaches the first inner diameter Dx or the second inner diameter Dy as it approaches the straight line along the inner diameter Dy.

  In the present embodiment, the opening 12 is, for example, an n-polygon, and the maximum values of the oblique inner diameters Dxy1 and Dxy2 are 45 degrees with respect to the X axis and the Y axis (the crossing angle of the X axis and the Y axis). 1/2) Within the range of ± (360 / n) degrees. The shape of the inner peripheral surface of the opening 12 is not limited to a polygon, and may be a curved surface. In this case, the maximum values of the oblique inner diameters Dxy1 and Dxy2 are within a range of 45 degrees (1/2 of the crossing angle between the X axis and the Y axis) ± 15 degrees with respect to the X axis and the Y axis.

  The inner diameter of the opening 12 changes stepwise or continuously from the position where the oblique inner diameters Dxy1 and Dxy2 are the maximum value toward the first inner diameter Dx or the second inner diameter Dy. However, the maximum value of the slant inner diameters Dxy1 and Dxy2 may be monotonously decreased and changed toward the first inner diameter Dx or the second inner diameter Dy, or the first inner diameter Dx or the second second may be increased and decreased repeatedly. You may make it approach the internal diameter Dy. The maximum values of the oblique inner diameters Dxy1 and Dxy2 are preferably 1.02 to 1.05 times the first inner diameter Dx or the second inner diameter Dy.

  In the lens driving device 2 according to the present embodiment, as illustrated in FIG. 6B, the oblique inner diameters Dxy1 and Dxy2 of the oblique opening 12 located between the X axis and the Y axis are in the X axis direction of the opening 12. It is larger than the first inner diameter Dx and larger than the second inner diameter Dy of the opening 12 in the Y-axis direction. With this configuration, the lens 100 forms the opening edge of the opening 12 not only when the lens 100 moves in the X-axis direction or the Y-axis direction, but also when the lens 100 moves in an oblique direction between them. The possibility of colliding with the inner peripheral surface of the cylindrical convex portion 14 is eliminated.

  In addition, in the lens driving device 2 according to the present embodiment, the opening 12 formed in the base portion 10 is not a perfect circle, and the inner diameters Dxy1 and Dxy2 in the oblique direction located in the middle of the X-axis direction or the Y-axis direction. Has a large irregular shape. Therefore, the outer shape of the base portion 10 can be reduced as compared with a perfect circular opening that takes into account the maximum amount of movement in an oblique direction, which contributes to downsizing of the apparatus. In particular, as shown in FIG. 6B, in the oblique direction intersecting the X axis and the Y axis, there is a space, and even if the inner diameter of the opening 12 is increased in that direction, the outer shape of the base portion 10 and the circuit board 20 is increased. There is no need to increase the size.

  Further, assuming that the outer shape of the base portion 10 and the circuit board 20 is the same, in the present invention, compared to a perfect circular opening portion that considers the maximum amount of movement in the oblique direction, the X axis and the Y axis The width of the base portion 10 excluding the opening portion 12 along can be increased. Therefore, the number of turns of the first drive coil 30a and the second drive coil 30b can be increased, the driving force is improved, and the blur correction accuracy is improved.

  Further, in the present embodiment, the first drive unit includes a pair of first drive coils 30 a located on both sides of the opening 12 along the X-axis direction. The pair of first drive coils 30 a includes the base unit 10. Are arranged in parallel along two opposing sides. With this configuration, the driving force along the X-axis direction is improved, and the accuracy of blur correction is improved.

  The second drive unit includes a pair of second drive coils 30b located on both sides of the opening 12 along the Y-axis direction, and the pair of second drive coils 30b is opposed to the base unit 10 2. It is arranged in parallel along the side. With this configuration, the driving force along the Y-axis direction is improved and the accuracy of blur correction is improved.

  Furthermore, as shown in FIG. 4A, the frame 60 has a square ring shape as a whole, and as shown in FIG. 1, the frame 60 is disposed inside a case 11 having a square cylindrical shape fixed to the base 10 and has an oblique direction. Approximately to the diagonal direction of the square ring shape. By configuring in this way, as shown in FIG. 6B, it becomes possible to efficiently arrange the first drive coil 30a and the second drive coil 30b on the base 10 excluding the opening 12, The outer shape of the base portion 10 can be reduced, and the device 2 can be easily downsized.

  Furthermore, in the present embodiment, as shown in FIG. 6B, the cylindrical protrusion 14 is formed on the base 10 along the opening edge of the opening 6, and the cylindrical protrusion 14 is formed around the cylindrical protrusion 14. A first drive coil 30a and a second drive coil 30b are arranged. By comprising in this way, it can prevent effectively that the lens 100 collides with the 1st drive coil 30a arrange | positioned around the cylindrical convex part 14 and the 2nd drive coil 30b.

  Further, the presence of the cylindrical convex portion 14 makes it difficult for dust or the like present on the surfaces of the base portion 10 and the circuit board 20 to enter the opening portion 12. A lens 100 is passed through the opening 12, and an image sensor or the like is disposed at a rear position in the optical axis direction of the lens 100. If dust or the like adheres to the image sensor, the quality of the image to be captured may be deteriorated, and it is preferable that dust or the like does not enter the opening 12.

  Furthermore, as shown in FIGS. 5A to 5C, the presence of the cylindrical convex portion 14 allows the wire wiring 32 a that connects the pair of first drive coils 30 a and the pair of second drive coils 30 b. It is easy to arrange the wire wirings 32b that communicate with each other along the outer peripheral surface of the cylindrical convex portion. Further, the lead wires 34a and 34b of the drive coils 30a and 30b are connected to the circuit pattern of the circuit board 20 by effectively using the corner space between the cylindrical convex portion 14 and the drive coils 30a and 30b. Is easy.

  The present invention is not limited to the above-described embodiment, and can be variously modified. For example, in the above-described embodiment, the driving force of the shake correction coil 30 is increased by fixing the driving coils 30a and 30b to the surface of the circuit board 20, but there is no need to increase the driving force. For this, a circuit board in which a coil is embedded may be used.

  In the above-described embodiment, the first drive shaft and the second drive shaft are arranged in parallel to the sides of the square plate-shaped base portion 10 and the circuit board 20, but the present invention is not limited thereto. For example, the first drive coil 30a and the second drive coil 30b are arranged so that the first drive shaft and the second drive shaft are positioned on the diagonal line of the square plate-shaped base portion 10 and the circuit board 20. Also good.

  Further, in the above-described embodiment, the single dual-purpose magnet 80 has the two functions of the shake correction magnet and the autofocus magnet. However, separate magnets may be prepared and attached. .

  Furthermore, in the above-described embodiment, the lens driving device 2 has two mechanisms, that is, an autofocus mechanism and a shake correction mechanism. However, the lens drive device of the present invention only needs to have at least a shake correction mechanism.

  In the above-described embodiment, the intersection angle between the first drive shaft and the second drive shaft is 90 degrees. However, in the present invention, these intersection angles may be other than 90 degrees.

  In the embodiment described above, four suspension wires are used as means for holding the frame 60 as the movable portion movably with respect to the base portion 10 as the fixed portion along the drive plane (including the X axis and the Y axis). However, the number of suspension wires is not limited to four, and a plurality of suspension wires may be used.

DESCRIPTION OF SYMBOLS 2 ... Lens drive device 10 ... Base part 11 ... Case 12 ... Base opening part 14 ... Cylindrical convex part 16 ... Suspension wire 18a, 18b ... Position sensor 20 ... Circuit board 22 ... Substrate opening part 23 ... Connector part 24 ... Damper base DESCRIPTION OF SYMBOLS 30 ... Shake correction coil 30a ... 1st drive coil 30b ... 2nd drive coil 40 ... Lens holder 41 ... Sensor component 42 ... Front 43a-43d ... Installation convex part 44a, 44b ... Leaf spring attachment part 45 ... Rear surface 46 ... Coil for focusing 47 ... Outer peripheral surface 48 ... Inner peripheral surface 49 ... Stepped portion 50 ... Rear springs 50a, 50b ... Split plate springs 52a, 52b ... Frame attaching portions 54a, 54b ... Holder attaching portions 55a-55d ... Meandering portion 60 ... Frame 61 ... Magnetic plate 62 ... Notch part 64 ... Front face 65 ... Mounting convex part 66 ... Magnet mounting concave part 6 ... Corner rear face 69 ... Rear convex part 70a ... First damper material 70b ... Second damper material 72 ... Inward convex part 73 ... Front face 74 ... Damper concave part 80 ... Dual-use magnet 80a ... First drive magnet 80b ... Second Driving magnet 90 ... Front springs 90a to 90d ... Split plate springs 92a to 92d ... Wire attachment parts 93a to 93d ... Holder attachment parts 94a to 94d ... Frame attachment parts 95a to 95d ... Serpentine part 100 ... Lens

Claims (7)

A lens portion including at least one lens;
A frame that holds the lens unit movably in the optical axis direction;
A first drive unit that moves the lens unit together with the frame along a first drive axis perpendicular to the optical axis of the lens;
A lens having a second driving unit that moves the lens unit relative to the base unit along a second driving axis perpendicular to the optical axis of the lens and intersecting the first driving axis together with the frame. A driving device comprising:
In the base portion, an opening is formed in which a part of the lens is inserted movably along a driving plane including the first driving shaft and the second driving shaft.
An oblique inner diameter of the opening in the oblique direction located between the first drive shaft and the second drive shaft is larger than a first inner diameter of the opening in the first drive shaft direction, and the opening of the opening greater than the second inner diameter of the second drive axis rather,
The lens does not collide with the inner peripheral surface of the opening not only when moving in the direction of the first drive shaft or the direction of the second drive shaft but also when moving in the oblique direction. A lens driving device. The first drive unit includes a pair of first drive coils positioned on both sides of the opening along the first drive axis direction,
The lens driving device according to claim 1, wherein the pair of first driving coils are arranged in parallel along two opposing sides of the base portion. The second drive unit includes a pair of second drive coils positioned on both sides of the opening along the second drive axis direction,
The lens driving device according to claim 1, wherein the pair of second driving coils are arranged in parallel along two opposing sides of the base portion. The lens driving device according to claim 1, wherein the frame is held movably along the driving plane with respect to the base portion by using a plurality of suspension wires. The frame has a square ring shape as a whole, and is disposed inside a square cylindrical case fixed to the base portion ,
The lens driving device according to claim 4, wherein the oblique direction substantially coincides with a diagonal direction of the square ring shape. Along the opening edge of the opening, a cylindrical convex portion is formed on the base portion,
The lens driving device according to claim 1, wherein at least a part of the first driving unit and the second driving unit is disposed around the cylindrical convex portion. The lens drive according to any one of claims 1 to 6, wherein an inner diameter of the opening portion changes stepwise or continuously from a position at which the oblique inner diameter becomes a maximum value toward the first inner diameter or the second inner diameter. apparatus.

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