Lens driving device, camera device, and electronic device

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device that can withstand loads caused by friction in a system having a plurality of movable parts and hold each movable part in a neutral position. The support mechanism of the lens driving device (6) includes: two guide shafts (47) and (48) whose both ends are fixed to the first fixing part (10) and the second fixing part (20), extending along the optical axis direction and passing through the first movable part (11) and the second movable part (21); first spring members (71) and (81) whose one ends are fixed to the first fixing part (10) and the other ends are fixed to the first movable part (11); and second spring members (72) and (82) whose one ends are fixed to the second fixing part (20) and the other ends are fixed to the second movable part (21).

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] Among camera devices mounted on electronic devices such as smartphones, some have a lens driving mechanism with various functions such as optical zoom or focusing. As a document disclosing a technology related to such a camera device, there is Patent Document 1. In the lens driving device described in Patent Document 1, a disc spring surrounding a guide member is provided between a bearing portion through which one of the guide members in a movable bracket that slides in the X direction along two fixed axes passes and a stopper of a base.

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2013-218751

[0004] However, the technology of Patent Document 1 is a structure that holds the movable part in a neutral position by the biasing force of a disc spring, but it is difficult to apply to a lens driving mechanism that individually drives and holds a plurality of movable parts that hold a plurality of lenses. Summary of the Invention

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a lens driving device, a camera device, and an electronic device that can hold each movable part in a neutral position in a system having a plurality of movable parts.

[0006] In order to solve the above problems, a lens driving device according to a preferred aspect of the present invention is characterized by including: a first movable part and a second movable part, each having a lens holding part that holds a lens having a common optical axis; a fixed part having a first fixed part and a second fixed part that are disposed between the first movable part and the second movable part and face each other in the optical axis direction; and a support mechanism, wherein the first fixed part faces the first movable part, the second fixed part faces the second movable part, and the support mechanism includes: two guide shafts whose both ends are fixed to the first fixed part and the second fixed part, extending along the optical axis direction and passing through the first movable part and the second movable part; a first spring member whose one end is fixed to the first fixed part and the other end is fixed to the first movable part; and a second spring member whose one end is fixed to the second fixed part and the other end is fixed to the second movable part.

[0007] In this aspect, the first spring member and the second spring member may be disc springs.

[0008] Alternatively, the first spring member and the second spring member may respectively pass through the guide shaft at the center.

[0009] Alternatively, there may be two auxiliary guide shafts, which are fixed at positions different from the positions where the two guide shafts are fixed in the first fixing portion and the second fixing portion, extend along the optical axis direction and penetrate through the first movable portion and the second movable portion, and the first spring member and the second spring member respectively pass through the auxiliary guide shafts at the centers.

[0010] Alternatively, the two guide shafts penetrate through holes at positions that are opposed to each other with the centers of gravity interposed therebetween in the first movable portion and the second movable portion.

[0011] Alternatively, the two auxiliary guide shafts penetrate through holes at positions that are opposed to each other with the centers of gravity interposed therebetween in the first movable portion and the second movable portion.

[0012] Alternatively, there may further be a drive mechanism, which includes: a first drive coil and a second drive coil, which are installed on the installation portions of the first movable portion and the second movable portion; a yoke, which forms a U shape having two straight portions and is installed with the first fixing portion and the second fixing portion; and a drive magnet, which is installed on one of the straight portions of the yoke, and the other straight portion of the yoke penetrates through the center holes of the first drive coil and the second drive coil respectively through the installation portions provided on the first movable portion and the second movable portion.

[0013] Alternatively, there may be a first drive coil installed on the first movable portion and a second drive coil installed on the second movable portion, and two first spring members and two second spring members are respectively provided. One end of the first drive coil is electrically connected to the other end of one of the first spring members, the other end of the first drive coil is electrically connected to the other end of the other first spring member, and one ends of the two first drive coils are electrically connected to the outside of the device on the side of the first fixing portion. One end of the second drive coil is electrically connected to the other end of one of the second spring members, the other end of the second drive coil is electrically connected to the other end of the other second spring member, and one ends of the two second drive coils are electrically connected to the outside of the device on the side of the second fixing portion.

[0014] A camera device according to another preferred embodiment of the present invention includes the above lens drive device.

[0015] An electronic device according to another preferred embodiment of the present invention includes the above camera device.

[0016] In the present invention, there is provided: a fixing portion having a first fixing portion and a second fixing portion opposed to each other in the optical axis direction; a first movable portion and a second movable portion; and a support mechanism. The first fixing portion faces the first movable portion, and the second fixing portion faces the second movable portion. The support mechanism includes: two guide shafts whose both ends are fixed to the first fixing portion and the second fixing portion, extending along the optical axis direction and passing through the first movable portion and the second movable portion; a first spring member interposed between the first fixing portion and the first movable portion; and a second spring member interposed between the second fixing portion and the second movable portion. Thus, the first movable portion and the second movable portion are respectively held at neutral positions by the first spring member and the second spring member. Therefore, according to the present invention, it is possible to provide a lens driving device, a camera device, and an electronic device that can hold each movable portion at a neutral position in a system having a plurality of movable portions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of a smartphone 4, which is an electronic device equipped with a camera device 5 including a lens driving device 6 according to an embodiment of the present invention.

[0018] Figure 2 is a perspective view of the camera device 5 including Figure 1 the lens driving device 6.

[0019] Figure 3 is an exploded perspective view of Figure 2 the lens driving device 6.

[0020] Figure 4 is a perspective view of the lens driving device 6 observed from another perspective Figure 2 thereof.

[0021] Figure 5 is a view showing Figure 4 the internal structure of the housing 90 of the lens driving device 6.

[0022] REFERENCE SIGNS LIST

[0023] 1 Sensor; 2, 100, 200 Lens bodies; 3 Prism; 4 Smart phone; 5 Camera device; 6 Lens driving device; 78 Yoke; 10 First fixing part; 11 First movable part; 15, 16, 25, 26 Notches; 20 Second fixing part; 21 Second movable part; 47, 48 Guide shafts; 57, 58 Auxiliary guide shafts; 70, 80 Driving magnets; 71, 81 First spring members; 72, 82 Second spring members; 90 Housing; 101, 201 Inner plates; 107, 108, 207, 208 Outer plates; 110, 220, 905, 906, 910, 920 Openings; 111, 211 Convex surfaces; 117, 118, 217, 218 Ring-shaped parts; 119, 219 Lens holding parts; 127, 128 First driving coils; 147, 148, 157, 158, 247, 248, 257, 258 Through holes; 175, 174, 176, 185, 184, 186, 275, 274, 276, 285, 284, 286 Square holes; 227, 228 Second driving coils; 471, 472, 481, 482, 571, 572, 581, 582 Round holes; 751 First FPC; 761 Second FPC; 752 Third FPC; 762 Fourth FPC. Detailed implementation manners

[0024] Hereinafter, while referring to the drawings, the implementation manners of the present invention will be described. As Figure 1 shown, the camera device 5 is built in the housing of the smart phone 4. In the present implementation manner, the camera device 5 is an optical element, and includes: lens bodies 2, 200, and 100, which have a common optical axis; an image sensor 1 that performs photoelectric conversion on the light introduced from the subject via the lens bodies 2, 200, and 100; and a lens driving device 6 that holds the lens bodies 2, 200, and 100 and the image sensor 1, and drives the lens bodies 200 and 100 with respect to the image sensor 1. In the present implementation manner, the camera device 5 further includes a prism 3, which is an optical element that bends the light from the subject and guides it into the lens bodies 2, 200, and 100.

[0025] Hereinafter, the optical axis direction along the optical axes of the lens bodies 2, 200, and 100 will be appropriately referred to as the Z direction, one direction orthogonal to the Z direction will be appropriately referred to as the X direction, and the direction orthogonal to both the Z direction and the X direction will be appropriately referred to as the Y direction. In addition, the +Z side, which is the side of the optical axes of the lens bodies 2, 200, and 100 having the prism 3, will be referred to as the front side, and the -Z side, which is the side provided with the image sensor 1 on the side opposite to the prism 3, will be referred to as the rear side. In addition, the +Y side will be referred to as the upper side, the -Y side will be referred to as the lower side, the +X side will be referred to as the left side, and the -X side will be referred to as the right side.

[0026] As Figure 2 shown,Figure 3 and Figure 4 As shown in Figure 4 , in a hollow rectangular parallelepiped-shaped housing 90, the lens driving device 6 houses a first movable part 11, a second movable part 21, a driving mechanism, a support mechanism, and a flexible printed circuit board. The driving mechanism includes two first driving coils 127 and 128, two second driving coils 227 and 228, two sets of driving magnets 70 and 80, and two sets of yokes 7 and 8. The support mechanism includes two guide shafts 47 and 48, two auxiliary guide shafts 57 and 58, two first spring members 71 and 81, and two second spring members 72 and 82. The flexible printed circuit board includes a first FPC 751, a second FPC 761, a third FPC 752, and a fourth FPC 762. At the rear and front openings 910 and 920 of the housing 90, first fixing parts 10 and second fixing parts 20 as fixing parts are inserted.

[0027] The upper surface of the housing 90 has a rectangular opening 905. The lower surface of the housing 90 has a rectangular opening 906 smaller than the opening 905. As Figure 2 and Figure 4 shown in Figure 4 , the upper convex surfaces 111 of the first movable part 11 and the upper convex surfaces 211 of the second movable part 21 are exposed from the upper opening 905 of the housing 90. The side surfaces of the lens body 100 housed in the lens holding part 119 formed concave toward the lower side of the first movable part 11 and the side surfaces of the lens body 200 housed in the lens holding part 219 formed concave toward the lower side of the second movable part 21 are exposed from the lower opening 906 of the housing 90.

[0028] The first fixing part 10 and the second fixing part 20 are arranged between the first movable part 11 and the second movable part 21 and face each other in the optical axis direction. As Figure 3 shown in Figure 3 , the first fixing part 10 has an inner plate 101 having a rectangular opening 110 at the center and two outer plates 107 and 108 provided on the left and right sides of the inner plate 101. An image sensor 1 is mounted at the rear side of the opening 110.

[0029] As Figure 4As shown, in the state where the first fixing part 10 is fixed to the housing 90, the inner plate 101 of the first fixing part 10 is received in the opening 910 of the housing 90, and the outer plates 107 and 108 are exposed to the outside. On the left side of the opening 110 in the first fixing part 10, square holes 175, 174, and 176 are provided in sequence from the round holes 571 and 471, and round holes 481 and 581 and square holes 185, 184, and 186 in sequence from the top are provided on the right side. The inner diameters of the round holes 571 and 581 are smaller than the inner diameters of the round holes 471 and 481. The width in the Y direction of the square holes 175, 176, 185, and 186 is half of the width in the Y direction of the square holes 174 and 184. On the left side surface of the outer plate 107, two notches 15 and 16 are provided.

[0030] As Figure 3 shown, the second fixing part 20 has an inner plate 201 with a circular opening 220 in the center and outer plates 207 and 208 provided on the left and right sides of the inner plate 201. A lens body 2 is embedded in the opening 220.

[0031] As Figure 2 shown, in the state where the second fixing part 20 is fixed to the housing 90, the inner plate 201 of the second fixing part 20 is received in the opening 920 of the housing 90, and the outer plates 207 and 208 are exposed to the outside. As Figure 3 shown, on the left side of the opening 220 in the second fixing part 20, round holes 572 and 472 and square holes 275, 274, and 276 in sequence from the top are provided, and round holes 482 and 582 and square holes 285, 284, and 286 in sequence from the top are provided on the right side. The inner diameters of the round holes 472 and 482 are the same as the inner diameters of the round holes 471 and 481 of the first fixing part 10. The inner diameters of the round holes 572 and 582 are the same as the inner diameters of the round holes 571 and 581. The width in the Y direction of the square holes 275, 276, 285, and 286 is half of the width in the Y direction of the square holes 274 and 284. Two notches 25 and 26 are provided on the left side surface of the outer plate 207. The partitions between the square holes 275 and 274, 274 and 276, 285 and 284, and 284 and 286 are recessed backward from the front surfaces of the outer plates 207 and 208. If the yokes 7 and 8 are inserted and installed in the square holes 275, 274, 276, 285, 284, and 286 from the front side of the second fixing part 20, the front ends of the yokes 7 and 8 are in the same plane as the fronts of the outer plates 207 and 208.

[0032] As Figure 3As shown, four through holes 147, 148, 157, and 158 are formed through the first movable part 11. Among the through holes 147, 148, 157, and 158, the through holes 147 and 148 are for guiding shafts 47 and 48 to pass through, and the through holes 157 and 158 are for auxiliary guiding shafts 57 and 58 to pass through. The through holes 147 and 148 have substantially the same diameter as the guiding shafts 47 and 48, and one of them forms a substantially long hole in the direction connecting the through hole 147 and the through hole 148. The through holes 157 and 158 have a size such that the auxiliary guiding shafts 57 and 58 do not come into contact. The through holes 147 and 148 are located at positions separated in one diagonal direction with the center of gravity of the first movable part 11 including the lens body 100, the first drive coils 127, and 128 in between, and the through holes 157 and 158 are located at positions separated in the other diagonal direction with the center of gravity of the first movable part 11 in between.

[0033] From the left front end portion and the left rear end portion of the first movable part 11 body, two annular portions 117 as the mounting portions of the first drive coil 127 are formed to protrude further to the left. In addition, from the right front end portion and the right rear end portion of the first movable part 11 body, two annular portions 118 as the mounting portions of the first drive coil 128 are formed to protrude further to the right. The first drive coil 127 is received and fixed between the two left annular portions 117, and the first drive coil 128 is received and fixed between the two right annular portions 118. The first drive coil 127 is fixed in such a manner that its central hole coincides with the central holes of the two annular portions 117, and the first drive coil 128 is fixed in such a manner that its central hole coincides with the central holes of the two annular portions 118.

[0034] The second movable part 21 has the same shape as the first movable part 11. Four through holes 247, 248, 257, and 258 are formed through the second movable part 21. Among the through holes 247, 248, 257, and 258, the through holes 247 and 248 are for guiding shafts 47 and 48 to pass through, and the through holes 257 and 258 are for auxiliary guiding shafts 57 and 58 to pass through. The through holes 247 and 248 have substantially the same diameter as the guiding shafts 47 and 48, and one of them forms a substantially long hole in the direction connecting the through hole 247 and the through hole 248. The through holes 257 and 258 have a size such that the auxiliary guiding shafts 57 and 58 do not come into contact. The through holes 247 and 248 are located at positions separated in one diagonal direction with the center of gravity of the second movable part 21 including the lens body 200, the second drive coils 227, and 228 in between, and the through holes 257 and 258 are located at positions separated in the other diagonal direction with the center of gravity of the second movable part 21 in between.

[0035] When observed from the Z direction, the positions of the circular holes 471, 481, 571, and 581 of the first fixing portion 10, the through holes 157, 148, 147, and 158 of the first movable portion 11, the through holes 257, 248, 247, and 258 of the second movable portion 21, and the circular holes 572, 482, 472, and 582 of the second fixing portion 20 are substantially the same.

[0036] Two annular portions 217, which are the mounting portions of the second drive coils 227, are formed to protrude further to the left from the left front end portion and the left rear end portion of the main body of the second movable portion 21. In addition, two annular portions 218, which are the mounting portions of the second drive coils 228, are formed to protrude further to the right from the right front end portion and the right rear end portion of the main body of the second movable portion 21. The second drive coil 227 of the drive mechanism is received and fixed between the two left annular portions 217, and the second drive coil 228 of the drive mechanism is received and fixed between the two right annular portions 218. The second drive coil 227 is fixed in such a manner that its central hole coincides with the central holes of the two annular portions 217, and the second drive coil 228 is fixed in such a manner that its central hole coincides with the central holes of the two annular portions 218.

[0037] The yokes 7 and 8 of the drive mechanism are magnetic bodies that are attracted to the magnets. The yokes 7 and 8 are formed in a shape in which a slender plate is bent into a U-shaped shape when observed from the X direction. The yokes 7 and 8 have two linear portions extending parallel in the Z direction and a bottom connecting them. The drive magnets 70 and 80 of the drive mechanism are plate-shaped. The width of the drive magnets 70 and 80 in the X direction is substantially equal to the width of the yokes 7 and 8 in the X direction, and the length of the drive magnets 70 and 80 in the Z direction is shorter than the length of the linear portions of the yokes 7 and 8 in the Z direction.

[0038] The yokes 7 and 8 are formed in a yoke group with two overlapping in the vertical direction. The linear portions of the two yokes 7 forming the group are inserted from the outside to the inside of the square holes 275, 274, and 276 of the second fixing portion 20. The lower linear portion of the upper yoke 7 and the upper linear portion of the lower yoke 7 are inserted into the square hole 274. The linear portions of the two yokes 8 forming the group are inserted from the outside to the inside of the square holes 285, 284, and 286 of the second fixing portion 20. The lower linear portion of the upper yoke 8 and the upper linear portion of the lower yoke 8 are inserted into the square hole 284. The drive magnets 70 are respectively disposed on the lower surface of the upper linear portion of the upper yoke 7 and the upper surface of the lower linear portion of the lower yoke 7. In addition, the drive magnets 80 are respectively disposed on the lower surface of the upper linear portion of the upper yoke 8 and the upper surface of the lower linear portion of the lower yoke 8.

[0039] The front ends of the straight portions of the yoke 7 are fitted into the square holes 175, 174, and 176 of the first fixing portion 10, and the front ends of the straight portions of the yoke 8 are fitted into the square holes 185, 184, and 186 of the first fixing portion 10. Two straight portions of the yoke 7 are fitted into the square hole 174, and two straight portions of the yoke 8 are fitted into the square hole 184. The front end surfaces of the yokes 7 and 8 and the rear surface of the first fixing portion 10 form a single surface. In this way, the yokes 7 and 8 also function as structural materials. The two straight portions at the center in the vertical direction of the group of yokes 7 and the two straight portions at the center in the vertical direction of the group of yokes 8 penetrate the first drive coils 127 and 128 and the second drive coils 227 and 228 together with the annular portions 117 and 118 of the first movable portion 11 and the annular portions 217 and 218 of the second movable portion 21.

[0040] At this time, the center holes of the first drive coils 127 and 128, the second drive coils 227 and 228, the annular portions 117 and 118, and the annular portions 217 and 218 are formed to be larger than the sizes of the two straight portions at the center in the vertical direction of the mating yokes 7 and 8, whereby the first movable portion 11 and the second movable portion 21 can move smoothly. In addition, the drive magnets 70 and 80 are arranged sandwiched between the straight portions at the center in the vertical direction of the yokes 7 and 8 and the first drive coils 127 and 128 and the second drive coils 227 and 228. According to this structure, if an electric current is applied to the first drive coils 127 and 128 or the second drive coils 227 and 228, electromagnetic forces are generated in the optical axis direction, respectively.

[0041] The two guide shafts 47 and 48 of the support mechanism are shafts having substantially the same diameter as the round holes 571 and 481 of the first fixing portion 10 and the round holes 472 and 482 of the second fixing portion 20. In addition, the through holes 147 and 148 of the first movable portion 11 and the through holes 247 and 248 of the second movable portion 21 also have substantially the same diameter. The rear ends of the guide shafts 47 and 48 are inserted into the round holes 571 and 481 of the first fixing portion 10, and the front ends of the guide shafts 47 and 48 are inserted into the round holes 472 and 482 of the second fixing portion 20 and fixed by an adhesive. The guide shafts 47 and 48 penetrate the through holes 147 and 148 of the first movable portion 11 and the through holes 247 and 248 of the second movable portion 21 and extend along the Z direction, which is the optical axis direction. Thereby, the first movable portion 11 and the second movable portion 21 are freely supported in the optical axis direction by the guide shafts 47 and 48. In addition, as described above, either one of the through holes 147 and 148 and either one of the through holes 247 and 248 are elongated holes, and the guide shaft corresponding to the round hole in each movable portion is the main shaft, and the guide shaft corresponding to the elongated hole is the sub-shaft.

[0042] The two auxiliary guide shafts 57 and 58 are shafts having substantially the same diameter as the circular holes 571 and 581 of the first fixing portion 10 and the circular holes 572 and 582 of the second fixing portion 20. The rear ends of the auxiliary guide shafts 57 and 58 are inserted into the circular holes 471 and 581 of the first fixing portion 10, and the front ends of the auxiliary guide shafts 57 and 58 are inserted into the circular holes 572 and 582 of the second fixing portion 20 and fixed by an adhesive. Both ends of the auxiliary guide shafts 57 and 58 are supported by the first fixing portion 10 and the second fixing portion 20, and extend along the Z direction, which is the optical axis direction, through the through holes 157 and 158 of the first movable portion 11 and the through holes 257 and 258 of the second movable portion 21.

[0043] The two first spring members 71 and 81 pass through the auxiliary guide shafts 57 and 58 at the center and are inserted between the first fixing portion 10 and the first movable portion 11. The two second spring members 72 and 82 pass through the auxiliary guide shafts 57 and 58 at the center and are inserted between the second fixing portion 20 and the second movable portion 21.

[0044] The inner diameters of the first spring members 71 and 81 are sized such that they do not contact the auxiliary guide shafts 57 and 58 in the natural length state. One end of each of the first spring members 71 and 81 is fixed to a position near the edge of the circular holes 471 and 581 in the first fixing portion 10, and the other end of each of the first spring members 71 and 81 is fixed to a position near the edge of the through holes 157 and 158 in the first movable portion 11. In the present embodiment, one end of the first spring member 71 is electrically connected to one end of the first FPC 751, and the other end is electrically connected to one end of the first drive coil 127. One end of the first spring member 81 is electrically connected to one end of the second FPC 761, and the other end is electrically connected to one end of the first drive coil 128. Further, the other end of the first drive coil 127 is electrically connected to the other end of the first drive coil 128. Thus, by using the juxtaposed first spring members 71 and 81 for the electrical connection of the first drive coils 127 and 128, the electrical wiring can be constrained only at the rear side of the lens driving device 6.

[0045] The inner diameters of the second spring members 72 and 82 are sized such that they do not contact the auxiliary guide shafts 57 and 58 in their natural length state. One end of each of the second spring members 72 and 82 is fixed to a position near the edge of the circular holes 572 and 582 in the second fixing portion 20. The other end of each of the second spring members 72 and 82 is fixed to a position near the edge of the through holes 257 and 258 in the second movable portion 21. In the present embodiment, one end of the second spring member 72 is electrically connected to the third FPC 752, and the other end is electrically connected to one end of the second drive coil 227. One end of the second spring member 82 is electrically connected to the fourth FPC 762, and the other end is electrically connected to one end of the second drive coil 228. Further, the other end of the second drive coil 227 is electrically connected to the other end of the second drive coil 228. Thus, by using the juxtaposed second spring members 72 and 82 for the electrical connection of the second drive coils 227 and 228, it is possible to bundle the electrical wiring only on the front side of the lens driving device 6.

[0046] The first FPC 751 extends in the X direction along the upper surface of the outer plate 107 of the first fixing portion 10. One end is bent downward along the left side of the outer plate 107 at the left end of the outer plate 107 and has a shape in which the bent end extends rearward. The other end is bent downward in a manner along the front surface near the circular hole 471. The second FPC 761 extends in the X direction along the lower surfaces of the inner plate 101 and the outer plate 107 of the first fixing portion 10, is bent upward along the left side of the outer plate 107, and has a shape in which the bent end extends rearward. The opposite side is bent upward in a manner along the front surface near the circular hole 581.

[0047] The first FPC 751 is joined to the upper surface of the outer plate 107 of the first fixing portion 10. As Figure 4 and Figure 5 shown, a portion protruding rearward of one end of the first FPC 751 is fixed to the notch 15 of the first fixing portion 10, and this portion is exposed to the outside. The other end of the first FPC 751 is electrically connected to the first spring member 71.

[0048] The second FPC 761 is joined to the lower surfaces of the inner plate 101 and the outer plate 107 of the first fixing portion 10. As Figure 4 and Figure 5 shown, a portion protruding rearward of one end of the second FPC 761 is fixed to the notch 16 of the first fixing portion 10, and this portion is exposed to the outside. The other end of the second FPC 761 is electrically connected to the first spring member 81.

[0049] The third FPC 752 and the fourth FPC 762 have a shape symmetric to that of the first FPC 751 and the second FPC 761 with respect to the XY plane. The third FPC 752 is joined to the upper surface of the outer plate 207 of the second fixing portion 20. As Figure 4 andFigure 5 As shown, the portion protruding from the front side of one end of the 3rd FPC 752 is fixed to the notch 25 of the 2nd fixing portion 20, and this portion is exposed to the outside. The other end of the 3rd FPC 752 is electrically connected to the 2nd spring member 72.

[0050] The 4th FPC 762 is joined to the lower surfaces of the inner plate 201 and the outer plate 207 of the 2nd fixing portion 20. As Figure 4 and Figure 5 shown, the portion protruding from the front side of one end of the 4th FPC 762 is fixed to the notch 25 of the 2nd fixing portion 20, and this portion is exposed to the outside. The other end of the 4th FPC 762 is electrically connected to the 2nd spring member 82.

[0051] The portions of the 1st FPC 751 and the 2nd FPC 761 that are fixed to the notches 15 and 16 of the 1st fixing portion 10 and are exposed to the outside, and the portions of the 3rd FPC 752 and the 4th FPC 762 that are fixed to the notches 25 and 26 of the 2nd fixing portion 20 and are exposed to the outside are electrically connected to the substrate of the smartphone 4. For example, current flows from the substrate of the smartphone 4 through the 1st FPC 751, the 1st spring member 71, the 1st drive coils 127 and 128, the 2nd spring member 81, and the 2nd FPC 761, and returns to the substrate of the smartphone 4. In addition, current flows from the substrate of the smartphone 4 through the 3rd FPC 752, the 2nd spring member 72, the 2nd drive coils 227 and 228, the 2nd spring member 82, and the 4th FPC 762, and returns to the substrate of the smartphone 4.

[0052] In a state where no current is supplied to the 1st drive coils 127 and 128, the 1st movable portion 11 is located at a position (hereinafter referred to as the neutral position) that is separated from the 1st fixing portion 10 by a distance corresponding to the natural lengths of the 1st spring members 71 and 81 toward the side of the 2nd fixing portion 20. In a state where no current is supplied to the 2nd drive coils 227 and 228, the 2nd movable portion 21 is located at a position (hereinafter referred to as the neutral position) that is separated from the 2nd fixing portion 20 by a distance corresponding to the natural lengths of the 2nd spring members 72 and 82 toward the side of the 1st fixing portion 10.

[0053] If current flows through the first drive coils 127 and 128, a thrust in the Z direction is generated due to the electromagnetic interaction between the first drive coils 127 and 128 and the drive magnets 70 and 80. The first movable part 11 acts against the biasing forces of the first spring members 71 and 81 and moves in the Z direction. If the supply of current to the first drive coils 127 and 128 is stopped, the first movable part 11 returns to the neutral position due to the restoring forces of the first spring members 71 and 81. Further, if current flows through the second drive coils 227 and 228, a thrust in the Z direction is generated due to the electromagnetic interaction between the second drive coils 227 and 228 and the drive magnets 70 and 80. The second movable part 21 acts against the biasing forces of the second spring members 72 and 82 and moves in the Z direction. If the supply of current to the second drive coils 227 and 228 is stopped, the second movable part 21 returns to the neutral position due to the restoring forces of the second spring members 72 and 82.

[0054] The above is the detailed content of this embodiment. According to this embodiment, the lens driving device 6 includes: a first movable part 11 and a second movable part 21, which respectively have lens holding parts 119 and 219 for holding lens bodies 100 and 200 having a common optical axis; a fixed part, which has a first fixed part 10 and a second fixed part 20 that are arranged between the first movable part 11 and the second movable part 21 and face each other in the optical axis direction; and a support mechanism. The first fixed part 10 faces the first movable part 11, and the second fixed part 20 faces the second movable part 21. The support mechanism includes: two guide shafts 47 and 48, whose both ends are fixed to the first fixed part 10 and the second fixed part 20, extend in the optical axis direction and penetrate through the first movable part 11 and the second movable part 21; first spring members 71 and 81, whose one ends are fixed to the first fixed part 10 and the other ends are fixed to the first movable part 11; and second spring members 72 and 82, whose one ends are fixed to the second fixed part 20 and the other ends are fixed to the second movable part 21. Therefore, the first movable part 11 can be held in the neutral position by the first spring members 71 and 81, and the second movable part 21 can be held in the neutral position by the second spring members 72 and 82. Therefore, according to this embodiment, it is possible to provide a lens driving device 6, a camera device 5, and an electronic device that hold each movable part in the neutral position in a system having a plurality of movable parts.

[0055] The natural lengths of the first spring members 71 and 81 and the second spring members 72 and 82, that is, the respective neutral positions, can be freely designed. Consider the functions and necessary strokes of the lens bodies 100 and 200, the balance between the spring constants, lengths, or thrusts of the first spring members 71 and 81 and the second spring members 72 and 82, etc.

[0056] In addition, a first spring member 71 and 81 can also be interposed between the first fixed portion 10 and the first movable portion 11, a second spring member 72 and 82 can be interposed between the second movable portion 21 and the second fixed portion 20, and a third spring member can be interposed between the first movable portion 11 and the second movable portion 21. By the balance of these three spring members, the first movable portion 11 and the second movable portion 21 are held in the neutral position.

[0057] Alternatively, a set of additional guide shafts and two additional sets of spring members can be added. The first movable portion 11 is connected to the first fixed portion 10 via the first spring members 71 and 81, and is connected to the second fixed portion 20 via a set of first additional spring members. At this time, a large through-hole for passing through the first additional spring members is also provided in the second movable portion 21. The auxiliary guide shaft 57 passes through the central holes of the first spring member 71 and one of the first additional spring members, and the auxiliary guide shaft 58 passes through the central holes of the first spring member 81 and the other first additional spring member. The second movable portion 21 is connected to the second fixed portion 20 via the second spring members 72 and 82, and is connected to the first fixed portion 10 via a set of second additional spring members. At this time, a large through-hole for passing through the first additional spring members is also provided in the first movable portion 11. One of the two additional auxiliary guide shafts passes through the central holes of the second spring member 72 and one of the second additional spring members, and the other passes through the central holes of the second spring member 82 and the other second additional spring member.

[0058] In the above-described embodiment, the auxiliary guide shafts 57 and 58 may not be provided, and the first movable portion 11 and the second movable portion 21 may be supported only by the two guide shafts 47 and 48 installed between the first fixed portion 10 and the second fixed portion 20. At this time, the first spring members 71 and 81 are passed through the centers of the guide shafts 47 and 48 and fixed to the first movable portion 11 and the first fixed portion 10, and the second spring members 72 and 82 are passed through the centers of the guide shafts 47 and 48 and fixed to the second movable portion 21 and the second fixed portion 20. Alternatively, at the centers of the first spring members 71 and 81 and the second spring members 72 and 82, they may be fixed to the first movable portion 11 and the first fixed portion 10 and the second movable portion 21 and the second fixed portion 20 without passing through any components.

[0059] In addition, in the above-described embodiment, the first spring members 71 and 81 and the second spring members 72 and 82 may not be coil springs but leaf springs. The leaf spring is composed of an outer portion fixed to the first fixed portion 10, an inner portion fixed to the first movable portion 11, and a plurality of arms connecting the outer portion and the inner portion. The leaf spring connecting between the second fixed portion 20 and the second movable portion 21 has the same structure. In addition, such leaf springs can also be used to connect between a plurality of movable portions including the first movable portion 11 and the second movable portion 21 and the fixed portions.

[0060] In addition, in the above-described embodiment, the separation direction of the through holes 147 and 148 or the separation direction of the through holes 247 and 248 may be a direction different from the diagonal direction. For example, the through holes 147 and 148 of the first movable portion 11 are located at respective positions separated in the X direction with the center of gravity of the first movable portion 11 interposed therebetween, and the through holes 247 and 248 of the second movable portion 21 are located at respective positions separated in the X direction with the center of gravity of the second movable portion 21 interposed therebetween.

[0061] In addition, in the above-described embodiment, in order to reduce the friction between the through holes 147, 148, 247, and 248 and the guide shafts 47 and 48 therein, a lubricant is provided between the inner peripheral surfaces of the through holes 147, 148, 247, and 248 and the outer peripheral surfaces of the guide shafts 47 and 48. In addition, grinding processing such as making the surfaces of the inner peripheral surfaces of the through holes 147, 148, 247, and 248 and the outer peripheral surfaces of the guide shafts 47 and 48 smooth may also be performed. In addition, the through holes 147, 148, 247, and 248 and the guide shafts 47 and 48 may also be formed by a combination of different materials. For example, the through holes 147, 148, 247, and 248 are formed of iron, and the guide shafts 47 and 48 are formed of other metals (e.g., stainless steel). In addition, the through holes 147, 148, 247, and 248 are formed of resin, and the guide shafts 47 and 48 are formed of metal.

[0062] In addition, an element having a reflecting surface such as the prism 3 is disposed on the front side of the second fixing portion 20, but it may not be disposed. In addition, the image sensor 1 may be moved in a direction orthogonal to the optical axis and rotated about the optical axis to perform shake correction. In addition, other lens bodies may be disposed between the lens body 100 and the image sensor 1.

[0063] In addition, in the present embodiment, the structure in which the housing 90 is sandwiched between the first fixing portion 10 and the second fixing portion 20 has been described, but in order to install the housing 90 at the end of assembly, the outer dimensions of one of the first fixing portion 10 and the second fixing portion 20 may be made slightly smaller than the dimensions of the openings 910 and 920. The drive mechanism may be disposed not on both the left and right sides but only on either one.

Claims

1. A lens driving device, characterized in that, it has: a first movable part and a second movable part, each having a lens holding part for holding a lens having a common optical axis; a fixing part having a first fixing part and a second fixing part which are arranged between the first movable part and the second movable part and face each other in the optical axis direction; a first driving coil mounted on the first movable part and a second driving coil mounted on the second movable part; and a support mechanism, the first fixing part faces the first movable part, and the second fixing part faces the second movable part, the support mechanism has: two guide shafts, both ends of which are fixed to the first fixing part and the second fixing part, extend along the optical axis direction and penetrate through the first movable part and the second movable part; a first spring member, one end of which is fixed to the first fixing part and the other end is fixed to the first movable part; and a second spring member, one end of which is fixed to the second fixing part and the other end is fixed to the second movable part, two of the first spring members and the second spring members are respectively provided, one end of the first driving coil is electrically connected to the other end of one of the first spring members, the other end of the first driving coil is electrically connected to the other end of the other first spring member, and one ends of the two first driving coils are electrically connected to the outside of the device on the first fixing part side, one end of the second driving coil is electrically connected to the other end of one of the second spring members, the other end of the second driving coil is electrically connected to the other end of the other second spring member, and one ends of the two second driving coils are electrically connected to the outside of the device on the second fixing part side.

2. The lens driving device according to claim 1, characterized in that, the first spring member and the second spring member are disc springs.

3. The lens driving device according to claim 2, characterized in that, the first spring member and the second spring member respectively pass through the guide shaft at the center.

4. The lens driving device according to claim 2, characterized in that, it has two auxiliary guide shafts, which are fixed at positions different from the positions where the two guide shafts are fixed to the first fixing part and the second fixing part, extend along the optical axis direction and penetrate through the first movable part and the second movable part, and the first spring member and the second spring member respectively pass through the auxiliary guide shaft at the center.

5. The lens driving device according to claim 1, characterized in that, the two guide shafts penetrate through holes at positions that are respectively opposed to each other across the center of gravity in the first movable part and the second movable part.

6. The lens driving device according to claim 4, characterized in that, the two auxiliary guide shafts penetrate through holes at positions that are respectively opposed to each other across the center of gravity in the first movable part and the second movable part.

7. The lens driving device according to claim 1, characterized in that, It further has a driving mechanism, and the driving mechanism has: the first driving coil and the second driving coil, which are installed on the installation parts of the first movable part and the second movable part; a yoke, which is formed in a U shape having two straight parts and installs the first fixed part and the second fixed part; and a driving magnet, which is installed on one of the straight parts of the yoke, The other straight part of the yoke penetrates the center holes of the first driving coil and the second driving coil through the installation parts provided on the first movable part and the second movable part respectively.

8. A camera device, wherein, It includes the lens driving device according to any one of claims 1 to 7.

9. An electronic device, wherein, It includes the camera device according to claim 8.

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