Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device, in which the movable part can move smoothly. The lens driving device 1 includes: a first movable lens holding part that holds a first movable lens body; a second movable lens holding part that holds a second movable lens body heavier than the first movable lens body; a first driving shaft that drives the first movable lens holding part and a second driving shaft that drives the second movable lens holding part; and a first guide shaft and a second guide shaft thicker than the first guide shaft. As the two guide shafts, they are arranged in parallel with the first driving shaft and the second driving shaft. The first movable lens holding part and the second movable lens holding part are each independently supported by one guide shaft and guided to bear their weights, and are prevented from rotating by the other guide shaft. The thicker second guide shaft supports and guides the weight bearing of the second movable lens holding part as the heavier one.

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 smartphones.

Background Art

[0002] In a camera device having a zoom function, a piezoelectric element is sometimes used as a drive source for a movable part that holds a lens body. As a document disclosing a technique related to such a camera device, there is Patent Document 1. The camera device described in Patent Document 1 includes a first movable lens body and a second movable lens body, and two actuators that drive the first movable lens body and the second movable lens body respectively are symmetrically arranged on one side and the other side of the optical axis sandwiching the lens body. In this camera device, two guide shafts are provided at diagonal positions in the main body. The holding frame of the first movable lens body is supported by the two guide shafts and is driven by the drive shaft of one actuator, and the holding frame of the second movable lens body is supported by the two guide shafts and is driven by the drive shaft of the other actuator. When a drive pulse is applied to the piezoelectric element located at the base end of the drive shaft of the actuator for the first movable lens body, the holding frame of the first movable lens body moves along the optical axis. When a drive pulse is applied to the piezoelectric element located at the base end of the drive shaft of the actuator for the second movable lens body, the holding frame of the second movable lens body moves along the optical axis.

[0003]

Prior Art Documents

[0004]

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006]

Problems to be Solved by the Invention

[0007] However, for the technique of Patent Document 1, one of the two guide shafts has a function of guiding the first movable lens body and a function of preventing the rotation of the second movable lens body, and the other guide shaft has a function of preventing the rotation of the first movable lens body and a function of guiding the second movable lens body. Therefore, when the weights of the first movable lens body and the second movable lens body are different, there is a risk of imposing a load on the shaft having the function of guiding the heavier lens body, which may hinder the smooth movement of the lens holding portion that holds the lens body.

[0008] The present invention has been completed in view of such problems, and an object thereof is to provide a lens driving device in which the lens holding portion can move smoothly even when the weights of the lens bodies are different.

[0009]

Means for Solving the Problems

[0010] In order to solve the above problems, a lens driving device according to a preferred embodiment of the present invention includes: a first movable lens holding portion that holds a first movable lens body; a second movable lens holding portion that holds a second movable lens body heavier than the first movable lens body; a first driving shaft that drives the first movable lens holding portion and a second driving shaft that drives the second movable lens holding portion; a first guide shaft and a second guide shaft thicker than the first guide shaft. As two guide shafts, they are arranged in parallel with the first driving shaft and the second driving shaft. The first movable lens holding portion and the second movable lens holding portion are each independently supported and guided in terms of load bearing by one of the guide shafts, and prevented from rotating by the other guide shaft. The second guide shaft, which is the thicker one, supports and guides the load bearing of the second movable lens holding portion, which is the heavier one.

[0011] In this embodiment, it is also possible that the first guide shaft supports and guides the load bearing of the first movable lens holding portion.

[0012] Alternatively, it is also possible that the second guide shaft supports and guides the load bearing of the first movable lens holding portion.

[0013] Alternatively, it is also possible that the second guide shaft is shorter than the first guide shaft.

[0014] A camera device according to another preferred embodiment of the present invention is characterized by including: the above lens driving device; the first movable lens body held by the first movable lens holding portion; the second movable lens body held by the second movable lens holding portion; an image sensor mounted on the lens driving device, and the overall weight of the second movable lens holding portion and the components held thereby is greater than the overall weight of the first movable lens holding portion and the components held thereby.

[0015] An electronic device according to another preferred embodiment of the present invention is characterized by including the above camera device.

[0016]

Advantages of the Invention

[0017] The lens driving device of the present invention includes: a first movable lens holding portion that holds a first movable lens body; a second movable lens holding portion that holds a second movable lens body heavier than the first movable lens body; a first driving shaft that drives the first movable lens holding portion and a second driving shaft that drives the second movable lens holding portion; a first guide shaft and a second guide shaft thicker than the first guide shaft. As two guide shafts, they are arranged in parallel with the first driving shaft and the second driving shaft. The first movable lens holding portion and the second movable lens holding portion are each independently supported and guided in their load-bearing by one of the guide shafts and prevented from rotating by the other guide shaft. As the thicker second guide shaft, it supports and guides the load-bearing of the heavier second movable lens holding portion. Thus, a guide shaft with higher rigidity supports and guides the load-bearing of the lens holding portion that holds the heavier lens body, and therefore a lens driving device in which the lens holding portion operates smoothly can be provided.

Description of the Drawings

[0018] Figure 1 It is a front view of a smartphone 4 equipped with a camera device 3 including a lens driving device 1 as one embodiment of the present invention.

[0019] Figure 2 It is Figure 1 a perspective view of the lens driving device 1.

[0020] Figure 3 It is an exploded Figure 2 perspective view of the lens driving device 1.

[0021] Figure 4 It is a sectional view of the section between the first fixed lens holding portion 30 and the first movable lens holding portion 40 in the lens driving device 1 observed from the +X side through Figure 2 the lens driving device 1.

[0022] Figure 5 It is observed from the +Y side Figure 2 a view of the main part of the lens driving device 1.

[0023] Figure 6 It is Figure 2 a perspective view of the main part of the lens driving device 1.

[0024] Figure 7 It is a perspective view of the +Z side part of the main part of the lens driving device 1 located Figure 2 observed from another direction.

Detailed Embodiment

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings. As Figure 1As shown, a camera device 3 including a lens driving device 1 according to an embodiment of the present invention is housed in a smartphone 4.

[0026] The camera device 3 includes: a first fixed lens body 31, a first movable lens body 41, a second fixed lens body 61, and a second movable lens body 71; an image sensor 2 that converts light incident thereon into an image signal; and a lens driving device 1 that holds the first fixed lens body 31, the first movable lens body 41, the second fixed lens body 61, the second movable lens body 71, and the image sensor 2, and drives the first movable lens body 41 and the second movable lens body 71 with respect to the image sensor 2. The first fixed lens body 31, the first movable lens body 41, the second fixed lens body 61, and the second movable lens body 71 are configured such that their respective optical axes are aligned.

[0027] Hereinafter, the direction in which light from a subject is incident is appropriately referred to as the X direction, a direction orthogonal to the X direction is appropriately referred to as the Y direction, and a direction orthogonal to both the X direction and the Y direction is appropriately referred to as the Z direction. The X direction is the optical axis direction. Further, the side of the subject in the optical axis direction, i.e., the +X side, is sometimes referred to as the front side, and the side opposite to the subject where the image sensor 2 is provided, i.e., the -X side, is sometimes referred to as the rear side. Further, the +Z side is sometimes referred to as the right side, the -Z side is sometimes referred to as the left side, the +Y side is sometimes referred to as the upper side, and the -Y side is sometimes referred to as the lower side.

[0028] The lens driving device 1 includes an angle cover 8, a housing 9, a first FPC 11, a second FPC 21, a first vibration member 12, a second vibration member 22, a rubber bushing 13, a rubber bushing 23, a first drive shaft 15, a second drive shaft 25, a first position sensor 14, a second position sensor 24, a first position detection magnet 16, a second position detection magnet 26, a first guide shaft 17, a second guide shaft 27, a first spring member 50, a second spring member 80, a first fixed lens holding portion 30, a first movable lens holding portion 40, a second fixed lens holding portion 60, a second movable lens holding portion 70, and a base 90.

[0029] The housing 9 has a hollow box shape that is open at the front and rear sides. The angle cover 8 is fitted into the opening 98 on the front side of the housing 9. The base 90 is fitted into the opening 99 on the rear side of the housing 9. On the upper plate of the housing 9, three cover plates 94 are arranged in parallel along the optical axis direction.

[0030] The base 90 has a rectangular rear plate and upper side plates, lower side plates, left side plates, and right side plates that stand upright from the peripheral portion of the rear plate toward the front. The upper side plates and lower side plates may not be formed in the central portion in the Z direction. The front end faces of the upper side plates, lower side plates, left side plates, and right side plates are formed flat, and the rear surface of the second fixed lens holding portion 70 described below is mounted and fixed thereon. The front surface of the second fixed lens holding portion 70 is formed flat, and the rear surface of the first fixed lens holding portion 30 described below is mounted and formed thereon.

[0031] 【0018-3】

[0032] A through hole 91 is provided at the center of the base 90. On the rear surface of the rear plate of the base 90, the image sensor 2 is fixed with its light receiving surface facing the side of the through hole 91. The rear ends of the first guide shaft 17 and the second guide shaft 27 are fixed on the left and right sides of the through hole 91 on the front surface of the base 90. The length of the second guide shaft 27 is shorter than the length of the first guide shaft 17.

[0033] The first FPC 11 and the second FPC 21 are arranged along the upper surface of the lower plate 93 of the housing 9. The first FPC 11 has a flat plate portion 115 and a pad portion 116 that stands up from one end portion of the flat plate portion 115. The second FPC 21 has a flat plate portion 215 and a pad portion 216 that stands up from one end portion of the flat plate portion 215. As Figure 2 shown, the flat plate portion 115 and the flat plate portion 215 are exposed to the outside from the gap 95 between the lower plate 93 of the housing 9 and the right side plate 92.

[0034] The first vibration member 12 is fixed to the pad portion 116. The second vibration member 22 is fixed to the pad portion 216. As Figure 5 shown, the first vibration member 12 and the second vibration member 22 are formed by laminating a piezoelectric element 110, an elastic thin plate 150, and a piezoelectric element 120.

[0035] At the first vibration member 12, the front end of the first drive shaft 15 is adhesively fixed. In addition, the rubber bushing 13 is fitted into the circular hole 355 of the first fixed lens holding portion 30, and the rubber bushing 160 is fitted into the circular hole 655 of the second fixed lens holding portion 60. The first drive shaft 15 is inserted into the central holes of the rubber bushings 13 and 160 and is coupled to the fixed portion of the lens driving device 1 via the rubber bushings 13 and 160. At the second vibration member 22, the front end of the second drive shaft 25 is adhesively fixed. In addition, the rubber bushing 23 is fitted into the circular hole 385 of the first fixed lens holding portion 30, and the rubber bushing 190 is fitted into a circular hole (not shown) of the base 90. The second drive shaft 25 is inserted into the central holes of the rubber bushings 23 and 190 and is coupled to the fixed portion of the lens driving device 1 via the rubber bushings 23 and 190. The length of the second drive shaft 25 is longer than the length of the first drive shaft 15.

[0036] Inside the housing 9, the first fixed lens holding portion 30, the first movable lens holding portion 40, the second fixed lens holding portion 60, and the second movable lens holding portion 70 are arranged in order from the front side. The first fixed lens holding portion 30 and the first fixed lens body 31 held thereon are exposed forward from between the two corner covers 8 in the opening portion 98 of the housing 9.

[0037] The first fixed lens holding portion 30 is a member that holds the first fixed lens body 31. The first movable lens holding portion 40 is a member that holds the first movable lens body 41. The second fixed lens holding portion 60 is a member that holds the second fixed lens body 61. The second movable lens holding portion 70 is a member that holds the second movable lens body 71.

[0038] Among them, the first fixed lens holding portion 30 and the second fixed lens holding portion 60 are fixed to the inner surface of the housing 9. The first movable lens holding portion 40 is supported movably along the X direction by the first drive shaft 15, the first guide shaft 17, and the second guide shaft 27. The second movable lens holding portion 70 is supported movably along the X direction by the second drive shaft 25, the first guide shaft 17, and the second guide shaft 27.

[0039] The first fixed lens holding portion 30 has a middle member having a U-shaped groove that opens upward, a left protrusion protruding from the left surface of the middle member, and a right protrusion protruding from the right surface of the middle member. A circular hole 355 and a circular hole (not shown) penetrate the left protrusion along the X direction. A circular hole 337 and a circular hole 385 penetrate the right protrusion along the X direction. The circular hole 355 is larger than the circular hole (not shown) and is provided closer to the upper side, and the circular hole 285 is larger than the circular hole 337 and is provided closer to the upper side.

[0040] The second fixed lens holding portion 60 has a U-shaped groove that opens upward in the center, a circular hole 647 and a circular hole 655 that penetrate along the X direction on the left side, and an angular hole 600 that penetrates along the X direction on the right side. The circular hole 655 is larger than the circular hole 647 and is provided closer to the upper side. The angular hole 600 is formed to be a size that does not contact the second drive shaft 25 and the second guide shaft 27.

[0041] The first movable lens holding portion 40 has a middle member 42 having a U-shaped groove that opens upward, a wrist portion 43 protruding from the right surface of the middle member 42, and a support table portion 44 protruding from the left surface of the middle member 42. The first movable lens body 41 is received and held in the groove of the middle member 42. At the front end of the wrist portion 43, a U-shaped sliding groove 437 that opens to the right is provided. The vertical width of the sliding groove 437 is substantially the same as the diameter of the second guide shaft 27, and it extends along the X direction for the second guide shaft 27 to be inserted therethrough.

[0042] The support table portion 44 is substantially rectangular parallelepiped-shaped. A circular hole 447 is provided in the support table portion 44. The circular hole 447 has the same diameter as the diameter of the first guide shaft 17, penetrates the support table portion 44 along the X direction, and allows the first guide shaft 17 to be inserted therethrough. On the upper surface of the support table portion 44, a V-groove 440 is provided. The V-groove 440 extends along the X direction. On the lower surface of the support table portion 44, a storage portion 446 for storing the first position detection magnet 16 is provided. The first position detection magnet 16 is stored and fixed in the storage portion 446. At a position on the first FPC 11 facing the first position detection magnet 16, the first position sensor 14 is fixed. The first position sensor 14 detects the magnetic field from the first position detection magnet 16 and outputs a signal indicating the detection result.

[0043] In the support table portion 44, the first spring member 50 is fixed. The first spring member 50 includes a V-spring 51 and an L-spring 52. The V-spring 51 forms a V-shape in two planes, and has a V portion 53 received in the V-groove 440 and a flat portion 54 placed on the upper surface of the support table portion 44, and is fixed to the support table portion 44. The L-spring 52 is L-shaped, and one flat portion 59 is fixed to the left side of the support table portion 44 in such a manner that one flat portion 58 faces the open portion of the V portion 53 of the V-spring 51. The first spring member 50 is fixed to the support table portion 44, constitutes a holding portion 56 that holds the first drive shaft 15 with the V portion 53 of the V-spring 51 and the flat portion 58 of the L-spring 52, and forms a triangular gap 55 for inserting the first drive shaft 15.

[0044] When the first drive shaft 15 is inserted, the two flat portions of the V portion 53 and the flat portion 58 are in a state of abutting against the first drive shaft 15, and the flat portion 58 presses the first drive shaft 15 toward the V portion 53 by spring force. In the axial direction of the first drive shaft 15, at the front and rear end edges of the two flat portions of the V portion 53 and the flat portion 58, expansion pieces 57 are respectively provided. The expansion pieces 57 project forward or backward while bending away from the first drive shaft 15. The base end portion of the expansion piece 57 includes at least a portion that abuts against the first drive shaft 15. Therefore, when observed along the abutting portion, the two flat portions of the V portion 53 and the flat portion 58 abut against the first drive shaft 15, but the expansion pieces 57 gradually separate when reaching the base end portion of the expansion piece 57. The degree of bending of the expansion piece 57 can be just a little bit, and in particular, it is desirable to implement it to the extent that no gap is generated at the base end portion.

[0045] The second movable lens holding part 70 has: a middle member 72 having a U-shaped groove opening upward; a wrist part 73 protruding from the left surface of the middle member 72; and a support table part 74 protruding from the right surface of the middle member 72. The second movable lens body 71 is received and held in the groove of the middle member 72. At the front end of the wrist part 73, a U-shaped sliding groove 737 opening to the left is provided. The vertical width of the sliding groove 737 is substantially the same as the diameter of the first guide shaft 17 and extends along the X direction for the first guide shaft 17 to pass through. The second movable lens body 71 is heavier than the first movable lens body 41, so the second movable lens holding part 70 is also heavier than the first movable lens holding part 40.

[0046] The support table part 74 is substantially rectangular parallelepiped-shaped. A circular hole 747 is provided in the support table part 74. The circular hole 747 has the same diameter as the diameter of the second guide shaft 27, penetrates the support table part 74 along the X direction for the second guide shaft 27 to pass through. On the upper surface of the support table part 74, a V-shaped groove 740 is provided. The V-shaped groove 740 extends along the X direction. On the lower surface of the support table part 74, a storage part 746 for storing the second position detection magnet 26 is provided. The second position detection magnet 26 is received and fixed in the storage part 746. At a position on the second FPC 21 facing the second position detection magnet 26, the second position sensor 24 is fixed. The second position sensor 24 detects the magnetic field from the second position detection magnet 26 and outputs a signal representing the detection result.

[0047] The second spring member 80 is fixed to the support table part 74. The second spring member 80 has a V spring 81 and an L spring 82. The V spring 81 forms a V shape in two planes, has a V part 83 received in the V-shaped groove 740 and a flat part 84 placed on the upper surface of the support table part 74, and is fixed to the support table part 74. The L spring 82 is L-shaped, and with one flat part 88 facing the open part of the V part 83 of the V spring 81, the other flat part 89 is fixed to the right surface of the support table part 74. The second spring member 80 is fixed to the support table part 74, constitutes a holding part 86 that holds the second drive shaft 25 with the V part 83 of the V spring 81 and the flat part 88 of the L spring 82, and forms a triangular gap 85 for inserting the second drive shaft 25.

[0048] When the second drive shaft 25 is inserted, the two flat portions of the V portion 83 and the flat portion 88 are in a state of abutting against the second drive shaft 25, and the flat portion 88 presses the second drive shaft 25 toward the V portion 83 by spring force. At the front and rear end edges of the two flat portions of the V portion 83 and the flat portion 88, expansion pieces 87 are respectively provided. The expansion pieces 87 project forward or backward while bending away from the second drive shaft 25. The base end portion of the expansion piece 87 includes at least a portion that abuts against the second drive shaft 25. Therefore, when viewed along this abutting portion, the two flat portions of the V portion 83 and the flat portion 88 abut against the second drive shaft 25, but the expansion pieces 87 gradually separate when reaching the base end portion of the expansion pieces 87. The degree of bending of the expansion pieces 87 can be just a little bit, and it is particularly desirable to implement it to the extent that no gap is generated at the base end portion.

[0049] The first drive shaft 15 passes through the round hole 355 of the first fixed lens holder 30, the gap 55 of the first spring member 50 fixed to the first movable lens holder 40, and the round hole 655 of the second fixed lens holder 60. The front end of the first drive shaft 15 fixes the first vibrating member 12. The portion near the front end of the first drive shaft 15 is connected to the round hole 355 of the first fixed lens holder 30 via a rubber bushing 13. The rear end of the first drive shaft 15 is connected to the round hole 655 of the second fixed lens holder 60 via a rubber bushing 160. The first drive shaft 15 is pressed from the outside by the first spring member 50. Thereby, the two flat portions of the V portion 53 and the inner surface of the flat portion 58 of the first spring member 50 are frictionally engaged with the outer peripheral surface of the first drive shaft 15, and the first movable lens holder 40 is held on the first drive shaft 15.

[0050] The second drive shaft 25 passes through the round hole 385 of the first fixed lens holder 30, the angular hole 600 of the second fixed lens holder 60, the gap 85 of the second spring member 80 fixed to the second movable lens holder 70, and a round hole (not shown) of the base 90. The front end of the second drive shaft 25 fixes the second vibrating member 22. The portion near the front end of the second drive shaft 25 is connected to the round hole 385 of the first fixed lens holder 30 via a rubber bushing 23. The rear end of the second drive shaft 25 is connected to a round hole (not shown) of the base 90 via a rubber bushing 190. The second drive shaft 25 is pressed from the outside by the second spring member 80. Thereby, the two flat portions of the V portion 83 and the inner surface of the flat portion 88 of the second spring member 80 are frictionally engaged with the outer peripheral surface of the second drive shaft 25, and the second movable lens holder 70 is held on the second drive shaft 25.

[0051] The first guide shaft 17 is firmly fixed to the rear side wall of the base 90. It passes through the sliding groove 737 of the second movable lens holder 70, the circular hole 647 of the second fixed lens holder 60, and the circular hole 447 of the first movable lens holder 40, and is firmly fixed by the circular hole 647 and the circular hole 447. In the circular hole 447, there is almost no gap between the first guide shaft 17 and the first movable lens holder 40. Thus, the first guide shaft 17 guides the first movable lens holder 40 in such a way that it smoothly moves along the X direction while maintaining a specified posture unchanged. The first guide shaft 17 is arranged in such a way that it almost contacts the upper and lower inner surfaces of the sliding groove 737 of the second movable lens holder 70, preventing the second movable lens holder 70 from rotating around the second guide shaft 27.

[0052] The second guide shaft 27 is firmly fixed to the rear side wall of the base 90. It passes through the circular hole 747 of the second movable lens holder 70, the angular hole 600 of the second fixed lens holder 60, the sliding groove 437 of the first movable lens holder 40, and the circular hole 337 of the first fixed lens holder 30, and is firmly fixed by the circular hole 337. The second guide shaft 27 is thicker than the first guide shaft 17. In the circular hole 747, there is almost no gap between the second guide shaft 27 and the second movable lens holder 70. Thus, the second guide shaft 27 guides the second movable lens holder 70 in such a way that it smoothly moves along the X direction while maintaining a specified posture unchanged. The second guide shaft 27 is arranged in such a way that it almost contacts the upper and lower inner surfaces of the sliding groove 437 of the first movable lens holder 40, preventing the first movable lens holder 40 from rotating around the first guide shaft 17.

[0053] When a specified pulse voltage is repeatedly applied to the first vibration member 12 from the first FPC 11, the first vibration member 12 undergoes minute deformation. Along with this, the first drive shaft 15 repeatedly performs a small reciprocating asymmetric movement in the X direction. For example, when the first drive shaft 15 moves at a low speed along the +X direction, the first movable lens holder 40 follows the movement. When the first drive shaft 15 moves at a high speed along the -X direction, the first movable lens holder 40 does not follow but stays at that position and only moves along the +X direction depending on the situation. By repeatedly performing this action, the first movable lens holder 40 moves intermittently along the +X direction. If an opposite pulse voltage is applied, the first movable lens holder 40 moves intermittently along the -X direction.

[0054] When a prescribed pulse voltage is repeatedly applied from the second FPC 21 to the second vibrating member 22, the second vibrating member 22 is slightly deformed, and accordingly, the second drive shaft 25 repeatedly performs a small reciprocating asymmetric motion in the X direction. For example, when the second drive shaft 25 moves at a low speed along the +X direction, the second movable lens holding portion 70 follows the movement, and when the second drive shaft 25 moves at a high speed along the -X direction, the second movable lens holding portion 70 does not follow and stays at its position, and only moves along the +X direction depending on the situation. By repeatedly performing this operation, the second movable lens holding portion 70 moves intermittently along the +X direction. If an opposite pulse voltage is applied, the second movable lens holding portion 70 moves intermittently along the -X direction.

[0055] Here, the second movable lens body 71 is thicker than the first movable lens body 41, and accordingly, the second movable lens holding portion 70 has a larger dimension in the front-rear direction than the first movable lens holding portion 40. Therefore, the combined weight of the second movable lens body 71 and the second movable lens holding portion 70, which are the movable parts, is heavier than the combined weight of the first movable lens body 41 and the first movable lens holding portion 40. Therefore, the load applied to the second guide shaft 27 is larger than the load applied to the first guide shaft 17, and it is likely to hinder the smooth movement while maintaining a prescribed posture. However, by making the second guide shaft 27 thicker than the first guide shaft 17, it is possible to ensure the smooth movement while maintaining a prescribed posture.

[0056] Each of the lens bodies of the first fixed lens body 31, the first movable lens body 41, the second fixed lens body 61, and the second movable lens body 71 can be disposed in the U-shaped grooves that open upward to the corresponding lens holding portions after being disposed in the housing 9 together with the corresponding lens holding portions, the drive shafts, and the guide shafts, starting from the openings in the upper plate of the housing 9. After the setting, the openings are blocked by the cover plate 94.

[0057] The above are the details of this embodiment. For the lens driving device 1 in this embodiment, a lens driving device 1 can be provided, which includes: a first movable lens holding portion 40 that holds the first movable lens body 41; a second movable lens holding portion 70 that holds the second movable lens body 71, which is heavier than the first movable lens body 41; a first driving shaft 15 that drives the first lens holding portion 40 and a second driving shaft 25 that drives the second movable lens holding portion 70; and a first guide shaft 17 and a second guide shaft 27 that is thicker than the first guide shaft 17. As the two guide shafts 17, 27, they are arranged in parallel with the first driving shaft 15 and the second driving shaft 25. The first movable lens holding portion 40 and the second movable lens holding portion 70 are independent respectively, supported and guided by one of the guide shafts 17, 27 for their load-bearing and prevented from rotating by the other guide shaft 27, 17. As the thicker second guide shaft 27, it supports and guides the load-bearing of the second movable lens holding portion 70, which holds the heavier second movable lens body 71. Thus, the second movable lens holding portion 70 can move smoothly. In addition, the first guide shaft 17 supports and guides the load-bearing of the lighter first movable lens body 41, so a lens driving device 1 can be provided in which the first movable lens holding portion 40 moves smoothly.

[0058] In addition, in the above embodiment, it can also be that the thicker second guide shaft 27 also supports and guides the load-bearing of the first movable lens holding portion 40 that holds the lighter first movable lens body 41.

[0059]

Reference Signs

[0060] 1 lens driving device; 2 image sensor; 3 camera device; 4 smartphone; 8 corner cover; 9 housing; 11 first FPC; 12 first vibration member; 13 rubber bushing; 14 first position sensor; 15 first drive shaft; 16 first position detection magnet; 17 first guide shaft; 21 second FPC; 22 second vibration member; 23 rubber bushing; 24 second position sensor; 25 second drive shaft; 26 second position detection magnet; 27 second guide shaft; 30 first fixed lens holder; 31 first fixed lens body; 40 first movable lens holder; 41 first movable lens body; 42 middle member; 43 wrist portion; 44 support table portion; 50 first spring member; 51 V spring; 52 L spring; 53 V portion; 54, 58, 59 flat portion; 55 gap; 56 gripping portion; 57 expanding piece portion; 60 second fixed lens holder; 61 second fixed lens body; 70 second movable lens holder; 71 second movable lens body; 72 middle member; 73 wrist portion; 74 support table portion; 80 second spring member; 81 V spring; 82 L spring; 83 V portion; 84, 88, 89 flat portion; 85 gap; 86 gripping portion; 87 expanding piece portion; 90 base; 91 through hole; 92 side plate; 93 lower plate; 94 cover plate; 95 gap; 98 opening portion; 99 opening portion; 110 piezoelectric element; 115 flat plate portion; 116 solder pad portion; 120 piezoelectric element; 150 elastic thin plate; 160 rubber bushing; 190 rubber bushing; 215 flat plate portion; 216 solder pad portion; 337, 355 round holes; 385 round hole; 437 sliding groove; 440 V-shaped groove; 446 storage portion; 447 round hole; 600 angular hole; 647 round hole; 655 round hole; 737 sliding groove; 740 V-shaped groove; 746 storage portion; 747 round hole.

Claims

1. A lens driving device, characterized in that, Comprising: A first movable lens holding part for holding a first movable lens body; A second movable lens holding part for holding a second movable lens body heavier than the first movable lens body; A first drive shaft for driving the first movable lens holding part and a second drive shaft for driving the second movable lens holding part; And A first guide shaft and a second guide shaft thicker than the first guide shaft. As two guide shafts, they are arranged in parallel with the first drive shaft and the second drive shaft, The first movable lens holding part and the second movable lens holding part are each independently supported by one of the guide shafts and guided to bear their weights, and are prevented from rotating by the other guide shaft, As the thicker second guide shaft, it supports and guides the weight bearing of the second movable lens holding part as the heavier one, and prevents the first movable lens holding part as the lighter one from rotating; As the thinner first guide shaft, it supports and guides the weight bearing of the first movable lens holding part as the lighter one, and prevents the second movable lens holding part as the heavier one from rotating.

2. The lens driving device according to claim 1, wherein The second guide shaft is shorter than the first guide shaft.

3. A lens driving device, characterized in that, Comprising: A first movable lens holding part for holding a first movable lens body; A second movable lens holding part for holding a second movable lens body heavier than the first movable lens body; A first drive shaft for driving the first movable lens holding part and a second drive shaft for driving the second movable lens holding part; And A first guide shaft and a second guide shaft thicker than the first guide shaft. As two guide shafts, they are arranged in parallel with the first drive shaft and the second drive shaft, The first movable lens holding part and the second movable lens holding part are each independently supported by one of the guide shafts and guided to bear their weights, and are prevented from rotating by the other guide shaft, As the thicker second guide shaft, it supports and guides the weight bearing of the second movable lens holding part as the heavier one, and also supports and guides the weight bearing of the first movable lens holding part as the lighter one, As the thinner first guide shaft, it prevents the second movable lens holding part as the heavier one from rotating and prevents the first movable lens holding part as the lighter one from rotating.

4. The lens driving device according to claim 3, wherein The second guide shaft is shorter than the first guide shaft.

5. A camera device, characterized in that, Comprising: The lens driving device according to any one of claims 1 to 4; the first movable lens body held by the first movable lens holding part; and the second movable lens body held by the second movable lens holding part; and an image sensor mounted on the lens driving device, The total weight of the second movable lens holding part and the components it holds is greater than the total weight of the first movable lens holding part and the components it holds.

6. An electronic device, characterized in that, Comprising the camera device according to claim 5.

Images