Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device that realizes low-profile lens driving device using a vibration component as a driving source without rotating the lens body. The lens driving device comprises: a lens holding portion having a holding portion for holding the lens body, and supported in a manner that can move along the optical axis of the lens body; a driving shaft, which is extended and supported in a direction orthogonal to the optical axis; a vibration component, which is connected to one end of the driving shaft to cause the driving shaft to vibrate slightly; and a straight-moving cam mechanism portion, which is supported on the driving shaft in a manner that can move along the axial direction of the driving shaft. A first sliding surface is provided on the straight-moving cam mechanism portion, and a second sliding surface is provided on the lens holding portion. Thus, by sliding the first sliding surface relative to the second sliding surface, the force of the straight-moving cam mechanism portion moving along the axial direction is converted into a force that moves the lens holding portion along the optical axis. The present invention also provides a camera device and an electronic device.

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device and an electronic device used in electronic devices such as a smartphone or a surveillance camera. Background Art

[0002] The lens driving device for AF (Auto Focus) using a piezoelectric element as a driving source moves the lens body intermittently with a fine pitch by expanding and contracting the piezoelectric element. Patent document 1 discloses a technology that can contribute to the low-profile of the lens driving device for AF using a piezoelectric element as a driving source. The driving device disclosed in patent document 1 is provided with a male thread on the inner periphery of the center hole of a guide component as a fixed body, and a thread groove is provided on the outer periphery of a lens barrel as a movable body that holds the lens body, the lens barrel is screwed into the hole of the guide component, and a piezoelectric element and a hammer are provided on the convex part of the outer periphery of the lens barrel. In this driving device, when a voltage is applied to the piezoelectric element, the piezoelectric element expands and contracts in the tangential direction of the lens barrel and applies a micro-vibration to the lens barrel, and the lens barrel moves along the optical axis of the lens while rotating along the spiral of the thread.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-199755 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the case of the technology of Patent Document 1, there is a problem that the lens body rotates together with the movement of the lens barrel as a movable body in the optical axis direction.

[0008] The present invention has been made in view of such a problem, and an object of the present invention is to achieve low-profile lens driving device using a vibration member as a driving source without rotating a lens body.

[0009] Means for solving problems

[0010] In order to solve the above-mentioned problems, as a preferred embodiment of the invention, a lens driving device comprises: a base; a lens holding part, which has a holding part for holding a lens body and is supported in a manner that can move along the optical axis of the lens body; a driving shaft, which extends in a direction orthogonal to the optical axis and is supported on the base; a vibration component, which is connected to one end of the driving shaft and causes the driving shaft to vibrate slightly; a straight cam mechanism part, which is supported on the driving shaft in a manner that can move along the axial direction of the driving shaft; a first protrusion, which is arranged on the straight cam mechanism part, has a first sliding surface and protrudes from the end on the lens holding part side toward the optical axis; a second protrusion, which is arranged on the lens holding part, has a second sliding surface and protrudes from the end on the straight cam mechanism part side toward the straight cam mechanism part; a pre-pressure part, which applies pre-pressure to the lens holding part along the optical axis; a guide shaft, which is fixed to the base and extends along the optical axis, and guides the lens holding part to be able to move along the optical axis; and a pushing portion, which pushes the lens holding portion toward the guide shaft along the axial direction of the drive shaft, at least one of the first sliding surface and the second sliding surface is a plane whose normal direction is located between the axial direction of the drive shaft and the optical axis, and at least at the position where the first sliding surface and the second sliding surface slide, the normal direction of the first sliding surface and the normal direction of the second sliding surface are in the same direction and in opposite directions, when the straight cam mechanism portion moves to one side of the axial direction of the drive shaft, the force caused by the movement of the straight cam mechanism portion is converted into a force that causes the lens holding portion to move to one side of the optical axis through the sliding of the first sliding surface relative to the second sliding surface, and the lens holding portion resists the force applied by the pre-pressure portion and moves to one side of the optical axis, and when the straight cam mechanism portion moves to the other side of the axial direction of the drive shaft, the force that causes the lens holding portion to move to one side of the optical axis becomes weaker, and the lens holding portion moves to the other side of the optical axis through the applied force.

[0011] In this aspect, a pre-pressure portion for applying pre-pressure to the lens holding portion along the optical axis may be provided.

[0012] Furthermore, a guide shaft extending along the optical axis may be provided, and a guide hole may be provided in the lens holding portion, and the guide shaft may pass through the guide hole.

[0013] Furthermore, two guide holes may be provided with the second sliding surface interposed therebetween.

[0014] Furthermore, the preload portion may be a coil spring, and the guide shaft may pass through a hollow portion thereof.

[0015] Furthermore, at least one of the first sliding surface and the second sliding surface may be a plane whose normal direction is located between the axial direction and the optical axis direction.

[0016] Furthermore, the other of the first sliding surface and the second sliding surface may be a plane, and the normal direction of the first sliding surface and the normal direction of the second sliding surface may be the same in direction but in opposite directions.

[0017] Alternatively, the other of the first sliding surface and the second sliding surface is a curved surface, and at the position where the first sliding surface and the second sliding surface slide, the normal direction of the first sliding surface and the normal direction of the second sliding surface are in the same direction but in opposite directions.

[0018] Furthermore, a support shaft extending in the axial direction may be provided, and the linear cam mechanism may be provided with a support hole, and the support shaft may pass through the support hole.

[0019] Alternatively, in the straight-moving cam mechanism portion, a protrusion having the first sliding surface protrudes from an end portion on the lens holding portion side toward the optical axis, and in the lens holding portion, a protrusion having the second sliding surface protrudes from an end portion on the straight-moving cam mechanism portion side toward the straight-moving cam mechanism portion side.

[0020] Furthermore, a pressing portion that presses the lens holding portion in the axial direction may be provided.

[0021] Alternatively, the pushing portion may include a magnet or a magnetic body provided on the lens holding portion and a component arranged opposite to the magnet or the magnetic body and exerting an attractive or repulsive force on the magnet or the magnetic body, and the lens holding portion may be pushed toward a guide axis extending along the optical axis by the attractive or repulsive force.

[0022] Alternatively, two guide shafts may be provided, one guide shaft being provided between the second sliding surface and the pressing portion, and the other guide shaft being provided at a position along the axial direction opposite to the one guide shaft sandwiching the second sliding surface.

[0023] A position sensor is also provided, wherein the pressing portion comprises: a magnet provided on the lens holding portion; and a magnetic plate provided opposite to the magnet, wherein the position sensor is located between the magnet and the magnetic plate, opposite to the magnet, and detects the magnetic field of the magnet.

[0024] A camera device according to another preferred embodiment of the present invention is characterized by including the above-mentioned lens driving device.

[0025] Another preferred embodiment of the present invention is an electronic device comprising the camera device described above.

[0026] Effects of the invention

[0027] The lens driving device of the present invention comprises: a lens holding part having a holding part for holding a lens body, and supported in a manner that can move along the optical axis of the lens body; a driving shaft, which is extended and supported in a direction orthogonal to the optical axis; a vibration component, which is connected to one end of the driving shaft and causes the driving shaft to slightly vibrate; and a straight cam mechanism part, which is supported on the driving shaft in a manner that can move along the axial direction of the driving shaft, wherein a first sliding surface is provided on the straight cam mechanism part, and a second sliding surface is provided on the lens holding part, and the force of the straight cam mechanism part moving along the axial direction is converted into a force that moves the lens holding part along the optical axis by sliding the first sliding surface relative to the second sliding surface. By arranging the driving shaft in a direction orthogonal to the optical axis, low-profile design can be achieved, and even in this case, the force of the straight cam mechanism part moving along the axial direction is converted into a force that moves the lens holding part along the optical axis, so that the lens body does not rotate. Thus, low-profile design of the lens driving device with the vibration component as a driving source can be achieved without rotating the lens body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of a smartphone 9 equipped with a camera device 8 including a lens driving device 5 according to an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A stereoscopic view of the lens driving device 5.

[0030] Figure 3 It is decomposed Figure 2 A stereoscopic view of the lens driving device 5.

[0031] Figure 4 yes Figure 2 1 is a perspective view of the main parts of the lens driving device 5.

[0032] Figure 5 From another perspective Figure 2 1 is a perspective view of the main parts of the lens driving device 5.

[0033] Figure 6 It is a perspective view of a main part of a lens driving device 5 as another embodiment of the present invention.

[0034] Mode for carrying out the invention

[0035] Below, while referring to the attached Figure 1The embodiments of the present invention are described below. Figure 1 As shown, a camera device 8 including a lens driving device 5 according to one embodiment of the present invention is accommodated in a smartphone 9 .

[0036] The camera device 8 includes: a lens body 6; an image sensor 7 that converts incident light through the lens body 6 into an image signal; and a lens driving device 5 that holds the lens body 6 and the image sensor 7 and drives the lens body along the optical axis of the lens body 6 relative to the image sensor 76.

[0037] Hereinafter, the direction in which light from the subject is incident is appropriately referred to as the Y direction, a direction orthogonal to the Y direction is appropriately referred to as the X direction, and a direction orthogonal to both the Y direction and the X direction is appropriately referred to as the Z direction. In addition, the side of the optical axis of the lens body 6 facing the subject is referred to as the front side, and the side opposite to the subject and provided with the image sensor 7 is referred to as the rear side. In addition, two directions orthogonal to the optical axis and mutually orthogonal are referred to as the left-right direction and the up-down direction, one side of the left-right direction is referred to as the left side, and the other side is referred to as the right side, and one side of the up-down direction is referred to as the upper side, and the other side is referred to as the lower side.

[0038] The lens driving device 5 includes a housing 10, a magnetic plate 15, a magnet 16, a lens holding portion 20, a guide shaft 31, a coil spring 32, a support shaft 37, a drive shaft 38, a rubber bushing 39, a vibration component 40, an FPC 48, a base 50, a linear cam mechanism portion 60, a spring component 70, and a support component 80.

[0039] The housing 10 is in the shape of a box with one side open. A through hole 17 for allowing light from a subject to pass is provided at the center of the front plate 11 of the housing 10, and two fixing holes 18 are provided in parallel in the left-right direction around the through hole 17.

[0040] The base 50 includes a quadrilateral rear plate 55, a first column 51, a second column 52, and a third column 53 rising from the upper right, lower right, and lower left corners of the rear plate 55, and a side plate 54 rising from the left end of the rear plate 55. The second column 52 is slightly offset from the right end to the left. The third column 53 is slightly offset from the left end to the right. A through hole 57 is provided at the center of the rear plate 55 for light from the subject passing through the lens body 6 to pass through.

[0041] The heights of the first column 51, the third column 53, and the side plate 54 are substantially the same. The height of the second column 52 is lower than the first column 51, the second column 52, and the side plate 54. A rectangular recess 548 is provided on the outer surface of the side plate 54. A hole 549 is provided in the recess 548. The magnetic plate 15 is fixed to the inner surface of the side plate of the housing 10. A fixing hole 537 and a circular hole 538 are provided in the third column 53. The fixing hole 537 and the circular hole 538 penetrate the third column 53 in the left-right direction.

[0042] A platform 56 having a smooth front surface is provided between the second column 52 and the third column 53 in the rear plate 55 and the periphery of the through hole 57 (the platform 56 on the third column 53 side is not shown). The platform 56 is provided with a fixing hole 58 .

[0043] The support member 80 is in the shape of a rectangular parallelepiped having substantially the same size as the third column portion 53. A portion including one corner of the support member 80 is grooved as a recessed portion 852. The support member 80 is provided with a fixing hole 837 and a circular hole 838. The fixing hole 837 and the circular hole 838 penetrate the support member 80 in the left-right direction. The support member 80 is fixed to the rear plate 55 in such a manner that the recessed portion 852 is engaged with the second column portion 52.

[0044] The straight cam mechanism 60 is substantially in the shape of a rectangular parallelepiped. A support hole 637 is provided in the straight cam mechanism 60. The support hole 637 penetrates the straight cam mechanism 60 in the left-right direction. The straight cam mechanism 60 passes through the support shaft 37 in the support hole 637, and is supported and guided so as to be freely movable in the left-right direction which is the axial direction of the support shaft 37. A flat surface portion 61 is provided at the lower end portion of the straight cam mechanism 60. Two positioning protrusions 62 are provided on the flat surface portion 61.

[0045] A groove 69 and a protrusion 66 are provided on the rear surface of the linear cam mechanism 60. The groove 69 extends in the left-right direction and is formed in a V-shaped manner that opens to the rear side when viewed from the left-right direction. A protrusion 66 is provided on the upper side of the groove 69. One end surface of the protrusion 66 is a plane, which is a first sliding surface 660. The normal direction of the first sliding surface 660 is located between the axial direction of the drive shaft 38 and the optical axis, and is rear-right oriented. The first sliding surface 660 slides relative to the second sliding surface 260 of the lens holding portion 20.

[0046] The spring member 70 has a V-shaped portion as a whole, and is composed of two springs, an L-shaped V spring 71 and an L-shaped L spring 72. The L spring 72 is combined on the outside of the V spring 71. A triangular gap 79 is provided between the V-shaped portion formed on the plate on the rear side of the V spring 71 and the plate on the rear side of the L spring 72. Two positioning holes 77 are provided on the plate on the lower side of the L spring 72, and two positioning grooves 78 are provided on the plate on the lower side of the V spring 71.

[0047] The V spring 71 is fitted into the positioning protrusion 62 of the flat portion 61 in the positioning groove 78, and the V-shaped portion is accommodated in the groove 69, and is fixed to the rectilinear cam mechanism portion 60. The L spring 72 is fixed to the rectilinear cam mechanism portion 60 by fitting the positioning protrusion 62 in the positioning hole 77 so that the plate on the lower side is closely attached to the plate on the lower side of the V spring 71. The drive shaft 38 is passed through the gap 79 of the spring member 70. The inner surface of the spring member 70 facing the gap 79 between the V spring 71 and the L spring 72 is frictionally engaged with the drive shaft 38.

[0048] The expansion piece 700 is provided on the left and right end sides of the spring member 70 where the gap 79 is formed. The expansion piece 700 is bent and protrudes so as to be separated from the drive shaft 38.

[0049] The upper half of the lens holding part 20 has a semicircular shape and the lower half has a rectangular shape when viewed from the optical axis. The lens holding part 20 is provided with a through hole 27 for holding the lens body 6. The lens body 6 is embedded in the through hole 27. The front peripheral edge 22 surrounding the through hole 27 is raised to the front side relative to the surroundings, and the rear peripheral edge 23 is raised to the rear side relative to the surroundings.

[0050] A guide hole 28 is provided at the lower left corner of the lens holding portion 20. The lower right corner of the lens holding portion 20 is a thin-walled portion 24 thinner than the lower left corner, and a guide hole 28 is provided therein. The guide hole 28 penetrates the lens holding portion 20 along the optical axis. The guide hole 28 on the right side is longer in the left-right direction than in the up-down direction.

[0051] On the left side of the lens holding portion 20, there is a frame portion 25 protruding outward. The frame 25 is provided with a magnet 16 embedded therein and fixed thereto. The magnet 16 faces the magnetic plate 15 fixed to the inner surface of the side plate of the housing 10 as the fixing portion with a gap therebetween. The magnet 16 and the magnetic plate 15 constitute a pressing portion, and the lens holding portion 20 is pressed toward the guide shaft 31 by the attractive force of the magnet 16 and the magnetic plate 15, thereby suppressing the movement of the lens holding portion 20 to move away from the guide shaft 31 when the lens holding portion 20 moves along the optical axis.

[0052] On the lower surface of the lens holding portion 20, a protrusion 26 is provided to protrude downwardly between the two guide holes 28, 28. The protrusion 26 is in a trapezoidal shape. One end surface of the protrusion 26 is a flat surface, which is a second sliding surface 260 having the same inclination as the first sliding surface 660 of the protrusion 66 of the straight cam mechanism 60. The normal direction of the second sliding surface 260 is the front left direction, and the normal direction of the first sliding surface 660 and the normal direction of the second sliding surface 260 are in the same direction and opposite to each other.

[0053] The lens holding part 20 is supported in a space between the front plate 11 of the housing 10 and the rear plate 55 of the base 50 by the guide shaft 31 and the coil spring 32 so as to be movable along the optical axis. The guide shaft 31 extends along the optical axis. The guide shaft 31 passes through the guide hole 28 of the lens holding part 20. The left guide shaft 31 is located between the second sliding surface 260 and the pushing part, and the right guide shaft 31 is provided at a position along the axial direction opposite to the left guide shaft 31 sandwiching the second sliding surface 260. There is almost no gap between the left guide shaft 31 and the guide hole 28. There is a gap between the right guide shaft 31 and the guide hole 28, especially in the left and right directions. The lens holding part 20 is pushed toward the right side surface of the left guide shaft 31 and pushed toward the lower side surface of the right guide shaft by the gravitational force of the pushing part. The front end of the guide shaft 31 is inserted into and fixed to the fixing hole 18 of the housing 10. The rear end of the guide shaft 31 is inserted into and fixed to the fixing hole 58 of the base 50. The coil spring 32 is provided so as to connect the lens holding part 20 and the stage 56, and the guide shaft 31 passes through the hollow part thereof. The coil spring 32 is a pre-compression part that applies pre-compression to the lens holding part 20 along the optical axis, and is a compression spring. The lens holding part 20 is pre-compressed to the front side by the coil spring 32.

[0054] The support shaft 37 and the drive shaft 38 extend in the left-right direction. The right end of the support shaft 37 is inserted into and fixed to the fixing hole 837 of the support member 80. The left end of the support shaft 37 is inserted into and fixed to the fixing hole 537 of the third column 53. The right end of the drive shaft 38 is inserted into and fixed to a rubber sleeve not shown in the figure, and is engaged with the circular hole 838 of the rubber sleeve. The left end of the drive shaft 38 passes through the rubber sleeve 39 and is connected to the vibration member 40. The vibration member 40 is formed by stacking the first piezoelectric element 41, the elastic thin plate 45 and the second piezoelectric element 42. The drive shaft 38 is fixed to the vibration member 40 by an adhesive 46. On the left side of the vibration member 40, a pad 49 protruding downward from the main body of the FPC 48 is fixed. The rubber sleeve 39 is engaged with the circular hole 538 of the base 50. The main body of the FPC 48 is bent in an L-shape, and the right side is inserted and fixed into the recess 548 of the base 50. At this time, the position sensor 481 provided on the right side of the FPC 48 is inserted into the hole 549. The position sensor 481 is located between the magnet 16 and the magnetic plate 15, and faces the magnet 16. The rear side extends from the rear end of the housing 10 toward the outside of the device. The magnet 16 stabilizes the lens holding part 20 by the attraction with the magnetic plate 15, and also acts as a magnet for position detection. The position sensor 481 detects the magnetic field from the magnet 16 and outputs a signal for controlling the optical axis position of the lens holding part 20. In addition, the magnetic plate 15 acts as a yoke, so that the input magnetic field to the position sensor 481 can be increased. In addition, the lens holding part 20 is pushed toward the guide shaft 31 by the attraction between the magnet 16 and the magnetic plate 15, so that the distance between the magnet 16 and the position sensor 481 can be fixedly maintained, and stable position control can be obtained.

[0055] The linear cam mechanism 60 is adjacent to the lower side of the lens holding portion 20 by means of the support shaft 37 and the drive shaft 38 interposed between the support member 80 and the third column portion 53, and is supported so as to be movable in the axial direction of the drive shaft 38. The first sliding surface 660 of the linear cam mechanism 60 is in contact with the second sliding surface 260 of the lens holding portion 20.

[0056] When a predetermined pulse voltage is repeatedly applied to the piezoelectric element from the FPC 48, the vibration member 40 is slightly deformed, and the drive shaft 38 repeats a slight reciprocating asymmetric reciprocating motion. For example, when the drive shaft 38 moves slowly to the left, the linear cam mechanism 60 follows the movement to the left, and when the drive shaft 38 moves sharply to the right, it does not follow but stays at its position, repeating such movements and intermittently moving to the left. When the opposite movement is made, the linear cam mechanism 60 moves intermittently to the right.

[0057] When the straight cam mechanism 60 moves to the right, the first sliding surface 660 of the straight cam mechanism 60 slides to the right relative to the second sliding surface 260 of the lens holding portion 20, and a rearward force is applied to the lens holding portion 20 from the straight cam mechanism 60. With this force, the lens holding portion 20 moves to the rear side against the elastic force of the coil spring 32. When the straight cam mechanism 60 moves to the left, the first sliding surface 660 of the straight cam mechanism 60 slides to the left relative to the second sliding surface 260 of the lens holding portion 20, and the rearward force applied to the lens holding portion 20 from the straight cam mechanism 60 becomes weaker, and the forward force of the coil spring 32 prevails. With this force, the lens holding portion 20 moves to the front side under the elastic force of the coil spring 32.

[0058] The above are the details of the present embodiment. The lens driving device 5 of the present embodiment comprises: a lens holding portion 20 having a holding portion for holding the lens body 6, and supported in a manner that allows movement along the optical axis of the lens body 6; a driving shaft 38, which is extended and supported in a direction orthogonal to the optical axis; a vibration component 40, which is connected to one end of the driving shaft 38 and causes the driving shaft 38 to vibrate slightly; and a straight cam mechanism portion 60, which is supported on the driving shaft 38 so as to be movable along the axial direction of the driving shaft 38. The straight cam mechanism portion 60 is provided with a first sliding surface 660, and the lens holding portion 20 is provided with a second sliding surface 260. Thus, by sliding the first sliding surface 660 relative to the second sliding surface 260, the force of the straight cam mechanism portion 60 moving along the axial direction is converted into a force that causes the lens holding portion 20 to move along the optical axis. By arranging the drive shaft 38 in a direction perpendicular to the optical axis, a low profile can be achieved, and even in this case, the force of the linear cam mechanism 60 moving along the axial direction is converted into a force for moving the lens holding portion 20 along the optical axis, so that the lens body 6 does not rotate. As a result, the lens driving device 5 using the vibration member 40 as a driving source can be low-profile without rotating the lens body 6.

[0059] In addition, in the above embodiment, one of the first sliding surface 660 and the second sliding surface 260 may be a curved surface. Figure 6 As shown, the protrusion 66 may be semi-cylindrical and the first sliding surface 660 may be semi-circularly curved. In addition, the protrusion 26 may be semi-cylindrical. In this case, at the position where the first sliding surface 660 and the second sliding surface 260 slide, the normal direction of the first sliding surface 660 and the normal direction of the second sliding surface 260 are in the same direction but in opposite directions.

[0060] In the above embodiment, the coil spring 32 may be a tension spring instead of a compression spring. In addition, the coil spring 32 may be provided between the housing 10 and the lens holding portion 20, and may be arranged so that the guide shaft 31 does not pass through the hollow portion thereof. In addition, as the pre-stressing portion, the coil spring 32 may be used instead of the coil spring 32, and a leaf spring may be used, or the attraction between a magnet and a magnetic body, or the attraction or repulsion between magnets may be used. As the vibration component 40, a so-called stacked type component may be formed by stacking multiple layers of piezoelectric elements.

[0061] In addition, the shape of the guide hole 28 on the left side and the shape of the guide hole 28 on the right side may be opposite. The magnetic plate 15 may also be provided on a fixed portion such as the side plate 54 of the base 50. The magnet 16 may also be provided on the fixed portion and the magnetic plate 15 may be provided on the lens holding portion 20. In addition, it may be other components such as the second magnet instead of the magnetic plate 15. In this case, an attractive force may act between the magnet 16 and the second magnet, or a repulsive force may act. In addition, the above embodiment is described as being mounted on a smartphone 9, but it may also be other electronic devices such as a surveillance camera.

[0062] Explanation of symbols:

[0063] 5 lens driving device; 6 lens body; 7 image sensor; 8 camera device; 9 smart phone; 10 housing; 11 front plate; 15 magnetic plate; 16 magnet; 17 through hole; 18 fixing hole; 20 lens holding portion; 22 peripheral portion; 23 peripheral portion; 24 thin wall portion; 25 frame portion; 26 protrusion; 27 through hole; 28 guide hole; 31 guide shaft; 32 coil spring; 37 support shaft; 38 driving shaft; 39 rubber sleeve; 40 vibration component; 41 first piezoelectric element; 42 second piezoelectric element; 45 elastic thin plate; 46 adhesive; 48 FPC; 49 pad portion; 50 base; 51 1 column portion; 52 second column portion; 53 third column portion; 54 side plate; 55 rear plate; 56 platform portion; 57 through hole; 58 fixing hole; 60 straight cam mechanism portion; 61 plane portion; 62 positioning protrusion; 66 protrusion portion; 69 groove; 70 spring component; 71V spring; 72L spring; 77 positioning hole; 78 positioning groove; 79 gap; 80 support component; 260 second sliding surface; 481 position sensor; 537 fixing hole; 538 circular hole; 548 recess; 549 hole; 637 support hole; 660 first sliding surface; 700 extension piece portion; 837 fixing hole; 838 circular hole; 852 recess.

Claims

1. A lens driving device, characterized in that: have: Pedestal; a lens holding portion having a holding portion for holding a lens body and supported in a manner movable along an optical axis of the lens body; A driving shaft extending in a direction orthogonal to the optical axis and supported by the base; a vibration component connected to one end of the drive shaft to cause the drive shaft to vibrate slightly; a linear cam mechanism supported on the drive shaft so as to be movable along the axial direction of the drive shaft; a first protrusion provided on the rectilinear cam mechanism, having a first sliding surface and protruding from an end portion on the lens holding portion side toward the optical axis; a second protrusion provided on the lens holding portion, having a second sliding surface and protruding from an end portion on the straight cam mechanism side toward the straight cam mechanism side; a pre-pressure portion for applying a pre-pressure to the lens holding portion along the optical axis; A guide shaft, which is fixed to the base and extends along the optical axis, and guides the lens holding part to move along the optical axis; as well as a pressing portion that presses the lens holding portion toward the guide shaft along the axial direction of the drive shaft, At least one of the first sliding surface and the second sliding surface is a plane whose normal direction is located between the axial direction of the drive shaft and the optical axis, and at least at the position where the first sliding surface and the second sliding surface slide, the normal direction of the first sliding surface and the normal direction of the second sliding surface are in the same direction and in opposite directions, When the straight-moving cam mechanism moves to one side of the axial direction of the drive shaft, the force caused by the movement of the straight-moving cam mechanism is converted into a force causing the lens holding part to move to one side of the optical axis through the sliding of the first sliding surface relative to the second sliding surface. The lens holding part resists the force applied by the pre-pressure part and moves to one side of the optical axis. When the straight-moving cam mechanism moves to the other side of the axial direction of the drive shaft, the force causing the lens holding part to move to one side of the optical axis becomes weaker, and the lens holding part moves to the other side of the optical axis through the force.

2. The lens driving device according to claim 1, characterized in that: The lens holding portion is provided with a guide hole, The guide shaft passes through the guide hole.

3. The lens driving device according to claim 2, characterized in that: The guide holes are provided at two locations with the second sliding surface sandwiched therebetween.

4. The lens driving device according to claim 2, characterized in that: The preload portion is a coil spring, and the guide shaft passes through a hollow portion thereof.

5. The lens driving device according to claim 1, characterized in that: The other of the first sliding surface and the second sliding surface is a flat surface.

6. The lens driving device according to claim 1, characterized in that: The other of the first sliding surface and the second sliding surface is a curved surface.

7. The lens driving device according to claim 1, characterized in that: A support shaft extending along the axial direction of the drive shaft is provided, A support hole is provided in the linear cam mechanism portion. The support shaft passes through the support hole.

8. The lens driving device according to claim 1, characterized in that: The pushing portion comprises: a magnet or a magnetic body provided on the lens holding portion; and a component provided opposite to the magnet or the magnetic body and exerting an attractive force or a repulsive force on the magnet or the magnetic body. The lens holding portion is urged toward the guide axis extending along the optical axis by the attractive force or the repulsive force.

9. The lens driving device according to claim 8, characterized in that: Two guide shafts are provided, one of which is provided at a position between the second sliding surface and the pressing portion, and the second sliding surface is sandwiched between the other guide shaft and the one guide shaft in the axial direction of the drive shaft.

10. The lens driving device according to claim 8, characterized in that: It also has a position sensor. The pressing portion includes a magnet provided on the lens holding portion and a magnetic plate provided opposite to the magnet. The position sensor is located between the magnet and the magnetic plate, faces the magnet, and detects the magnetic field of the magnet.

11. A camera device, characterized in that: A lens driving device according to any one of claims 1 to 10.

12. An electronic device, characterized in that: A camera device according to claim 11.

Images