Actuator, camera module, and camera mounting device

Abstract

The present invention can control the movement of the movable part in three-axis directions with high precision by detecting the position and rotation amount of the image sensor in the in-plane direction. The actuator (3) has a fixed part and a movable part having a rectangular image sensor (2), a coil (510) and a position sensor (52). The coil (510) is arranged at a position corresponding to each side of the image sensor (2), and two coils (510) are arranged in parallel along each of two opposing sides. If the two coils (510) arranged at positions facing each other in a positive direction corresponding to each of the two opposing sides are set as a coil group, a position sensor (52) is provided corresponding to each group of the coils. The position sensor (52) is arranged at a position corresponding to a coil (510) in each group of the coils.

Description

Technical Field

[0001] The present invention relates to an actuator, a camera module, and a camera-mounted device used in electronic devices such as smartphones. Background Art

[0002] Among camera modules with shake correction functions installed in electronic devices such as smartphones, there is a type of module called sensor displacement, which corrects shake by moving the image sensor in a plane orthogonal to the optical axis direction of the lens. As documents that disclose technologies related to such camera modules, there are patent documents 1 and 2. The shake correction device of the camera module described in patent document 1 is that two pairs of guide units extending along the directions of the two axes of the X axis and the Y axis are set on the outer periphery of the opening that passes through the rectangular plate-shaped shell from front to back, so that the shake correction moving device that holds the shooting element can be connected to the guide unit in a movable manner along the two pairs of guide units. The anti-shake autofocus module described in patent document 2 accommodates an assembly of an autofocus structure and an assembly of an anti-shake structure in a box-shaped shell having an opening that exposes the lens in the direction of the subject. The assembly of the autofocus structure drives the lens in the z-axis direction, and the assembly of the shake prevention structure drives the image sensor in the x-axis and y-axis directions. Add vibration-absorbing materials such as soft glue or soft springs between moving parts such as lenses and image sensors and other fixed parts.

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2006-115452

[0004] [Patent Document 2] Japanese Patent Application Publication No. 2013-050668

[0005] However, the techniques of Patent Documents 1 and 2 do not include a means for detecting whether the moving destination of the movable part including an image sensor matches the target, nor a means for correcting it. Therefore, there is a problem that it is difficult to control the movement of the movable part with high precision. Summary of the invention

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide an actuator, a camera module, and a camera mounting device capable of controlling the operation of a movable part in three-axis directions with high precision.

[0007] In order to solve the above-mentioned problems, an actuator as a preferred embodiment of the present invention comprises a fixed part and a movable part including a plurality of magnets, the movable part having a coil and a position sensor opposite to the magnet, for carrying a rectangular image sensor, the coil being arranged at a position corresponding to each side of the rectangle of the image sensor, and two of the coils being arranged in parallel along each side, when the two coils arranged at positions facing each other corresponding to each of the two opposite sides are set as a coil group, one position sensor is provided at a position corresponding to one of the coils in each group of coils, on the surface of each of the magnets corresponding to the coil, the inner part of the magnet is excited into one of the N pole and the S pole, and the outer part of the magnet is excited into the other of the N pole and the S pole, and each of the position sensors is located on the boundary line between the S pole and the N pole of the opposing magnet.

[0008] In this method, each of the coils can be composed of two straight line portions extending along each side and a semicircular portion connecting the two straight line portions, one of the straight line portions of each coil is opposite to the surface of the coil located on the inner side of each magnet, and the other straight line portion is opposite to the surface of the coil located on the outer side of each magnet.

[0009] In this aspect, two position sensors arranged corresponding to one of the two opposing sides may be arranged at positions oblique to each other.

[0010] Furthermore, the two position sensors arranged corresponding to the other two opposing sides may be arranged one by one at positions oblique to each other.

[0011] Alternatively, two position sensors arranged corresponding to one of the two opposing sides may be arranged in parallel along one of the two sides.

[0012] Alternatively, two position sensors arranged corresponding to the other of the two opposing sides may be arranged in parallel along one of the two sides.

[0013] Alternatively, there may be an FPC having a main body electrically connected to the image sensor and two connecting parts extending from the periphery of the main body and connected to the outside, wherein the position sensor is provided at a position away from a connection position between the main body and the two connecting parts.

[0014] A camera module as another preferred embodiment of the present invention includes the above-mentioned actuator

[0015] A camera-mounted device as another preferred embodiment of the present invention includes the above-mentioned camera module.

[0016] The present invention has a fixed part and a movable part having a rectangular image sensor, a coil and a position sensor, wherein the coil is arranged at a position corresponding to each side of the image sensor, and two coils are arranged in parallel along each of two opposite sides. If the two coils arranged at positions facing each other in a positive direction corresponding to each of the two opposite sides are set as a coil group, then one position sensor is provided corresponding to each group of the coils, and the position sensor is arranged at a position corresponding to one of the coils in each group of the coils. In particular, the position sensor can detect the position and rotation amount of the image sensor in its in-plane direction. Thus, an actuator, a camera module and a camera mounting device can be provided, which can control the movement of the movable part in the three-axis direction with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a smartphone 5 which is a camera-mounted device equipped with a camera module 4 including an actuator 3 as one embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A stereoscopic view of the actuator 3.

[0019] Figure 3 It is decomposition Figure 2 A stereoscopic view of the actuator 3.

[0020] Figure 4 Observe from other viewpoints Figure 2 An exploded perspective view of the actuator 3.

[0021] Figure 5 yes Figure 3 A three-dimensional view of the first FPC12.

[0022] Figure 6 yes Figure 3 A three-dimensional view of the first FPC 12 and the AF motor 110.

[0023] Figure 7 (A) is viewed from the +Z side Figure 3 (B) is a perspective view of the second FPC 60, and (B) is a perspective view viewed from the -Z side.

[0024] Figure 8 Yes Expand Figure 7 (A) is a diagram of the 2nd FPC60.

[0025] Fig. 9 Yes means Figure 3 FIG. 2 is a diagram showing a connection portion between the support leaf spring 22 and the suspension wire 6 of the actuator 3 and a connection portion between the suspension wire 6 and the coil substrate 50 .

[0026] Fig.10 Observed from the -Z direction Figure 3 as well as Figure 4 FIG. 4 shows a main body portion 61 of a second FPC 60 , a coil substrate 50 , and a spacer 40 .

[0027] Fig.11 Viewed from the -Z side Fig.10 FIG. 2 is a diagram showing the main body 61 of the second FPC 60 , the coil substrate 50 , and the spacer 40 when the image sensor 2 operates on the +X side.

[0028] Fig.12 Viewed from the -Z side Fig.10 FIG. 4 is a diagram showing the main body 61 of the second FPC 60 , the coil substrate 50 , and the spacer 40 when the image sensor 2 operates on the +Y side.

[0029] Fig.13 Viewed from the -Z side Fig.10 FIG. 2 is a diagram showing the main body 61 of the second FPC 60 , the coil substrate 50 , and the spacer 40 when the image sensor 2 is rotated in the clockwise direction.

[0030] Fig.14 Yes means Fig.10 FIG. 5 is a diagram showing another configuration example of the position sensor 52 of the main body 61.

[0031]

Explanation of symbols

[0032] 1 lens body; 2 image sensor; 3 actuator; 4 camera module; 5 smart phone; 6 suspension wire; 10 housing; 12 first FPC; 30 bracket; 40 partition; 50 coil substrate; 52 position sensor; 60 second FPC; 61 main body; 62 connecting part; 64 straight part; 65 connecting part; 66 front end; 70 sensor substrate; 80 frame; 90 bottom plate; 100 front wall; 101, 311, 411, 511, 611 through hole; 102 side wall; 110 AF motor; 111 through hole; 112, 804 groove; 114 recess; 120, 125, 620, 629, 729 terminals; 121 top; 122 long plate portion; 123 short plate portion; 124 connecting plate portion; 506 round hole; 220 large rectangular sheet portion; 222, 232, 410, 910 positioning hole; 226, 710, 904 notch; 230 small rectangular sheet portion; 240 first spring portion; 250 second spring portion; 260 supporting portion; 320 convex portion; 330, 340, 350, 810 positioning protrusion; 420 magnet; 510 coil; 520 driver IC; 621 first ridge line; 622 second ridge line; 623 third ridge line. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1As shown, in this embodiment, the camera module 4 is mounted on a smartphone 5. The camera module 4 includes: a lens body 1 as an optical element; an image sensor 2 that performs photoelectric conversion on light introduced from a subject via the lens body 1; and an actuator 3. The actuator 3 has both: a lens driving device that performs autofocus control based on the drive of the lens body 1; and an image sensor driving device that performs shake correction control based on the drive of the image sensor 2.

[0034] Hereinafter, the optical axis direction along the optical axis of the lens body 1 is appropriately referred to as the Z direction, a direction orthogonal to the Z direction is appropriately referred to as the X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as the Y direction. In addition, the +Z side where the optical axis of the lens body 1 is located on the side of the subject is sometimes referred to as the front side, and the side opposite to the subject where the image sensor 2 is provided is sometimes referred to as the -Z side rear side. In addition, the +Y side is sometimes referred to as the upper side, the -Y side is sometimes referred to as the lower side, the +X side is sometimes referred to as the left side, and the -X side is sometimes referred to as the right side.

[0035] like Figure 2 , Figure 3 as well as Figure 4 As shown, the actuator 3 has a frame, a lens driving device and an image sensor driving device housed in the frame. The frame has a shell 10, a frame 80 and a base plate 90. The lens driving device has an AF motor 110 and a first FPC 12. AF is the abbreviation of Auto Focus. FPC is the abbreviation of Flexible Printed Circuits. The AF motor 110 as a lens driving mechanism drives the lens body 1 back and forth in the optical axis direction, i.e., the Z direction. The driving source of the AF motor 110 can include magnets, coils, piezoelectric elements, shape memory alloys, etc., but are not limited to these. In addition, as a supporting mechanism for the lens body 1, leaf springs, bearings, guide grooves, support shafts, etc. can be listed, but are not limited to these.

[0036] The image sensor driving device includes a support plate spring 22, a bracket 30, a spacer 40, a magnet 420, a coil substrate 50, a second FPC 60, a sensor substrate 70, and a suspension wire 6. The image sensor driving mechanism includes a magnet 420 and a coil 510 provided on the coil substrate 50 as a driving source, and includes a support plate spring 22 and a suspension wire 6 as a supporting mechanism. The image sensor driving device drives the movable part on which the image sensor 2 is mounted in the X direction and the Y direction relative to the fixed part. Here, the fixed part includes the support plate spring 22, the bracket 30, the spacer 40, and the magnet 420, and the movable part includes the coil substrate 50, the second FPC 60, and the sensor substrate 70.

[0037] The structure of each part is described in more detail. The housing 10 is a hollow rectangular box surrounded by a front wall 100 and a side wall 102 extending from the periphery of the front wall 100 to the rear side. In the center of the front wall 100, there is a rectangular through hole 101. The portion between the front wall 100, the side wall 102 and the through hole 101 is recessed to the rear side as a recess 114 on the upper side and the lower side respectively. In addition, on the front wall 100, a rectangular groove 112 is provided between the side wall 102 on the left side and the through hole 101.

[0038] The AF motor 110 is in the shape of a rectangular parallelepiped, and has a width in the X direction and the Y direction that is slightly smaller than the through hole 101 of the housing 10 and the through hole 311 of the bracket 30. The AF motor 110 is provided with a through hole 111 that passes through the front and rear surfaces and is in a perfect circular shape. The lens body 1 is embedded in the through hole 111. The side surface of the AF motor 110 is bonded and fixed to the inner side surface of the bracket 30.

[0039] The first FPC 12 supplies the current supplied from the outside of the actuator 3 to the AF motor 110. Figure 5 As shown, the first FPC 12 has a shape obtained by bending a rectangular plate in a hook shape at the top 121, and the top 121 connects the long plate portion 122 and the short plate portion 123 at the front end. The long plate portion 122 and the short plate portion 123 facing each other with the top 121 sandwiched are parallel to each other. The short plate portion 123 also has a connecting plate portion 124 folded back on the opposite side of the long plate portion 122. At the rear of the long plate portion 122 and the connecting plate portion 124, a plurality of terminals 120 and 125 are provided in parallel along the Y direction.

[0040] like Figure 2 As shown, in the first FPC 12, the long plate portion 122 extends forward along the outer side of the side wall 102 of the housing 10, the top portion 121 is embedded in the groove 112 of the front wall 100, and the short plate portion 123 enters the inner side of the housing 10 from the through hole 111. Figure 6 As shown, on the inner side of the housing 10 , the short plate portion 123 is opposite to the side surface of the AF motor 110 , and the terminal 125 of the connecting plate portion 124 is electrically connected to the AF motor 110 .

[0041] exist Figure 3 as well as Figure 4 In the embodiment, the support leaf spring 22 has two corners. The support plate spring 22 is arranged in a shape of a letter ". " and two support plate springs 22 are arranged so that the two ends are close to each other. The two ends of the word have a small rectangular piece 230 of a smaller rectangular shape. There is a large rectangular piece 220 along the straight line in the middle of the central straight line of the word. The first spring portion 240 is formed by extending substantially straight between the corners of the character, and between each small rectangular piece 230 and The first spring portion 240 and the second spring portion 250 are formed to extend in a substantially straight line between the corners of the support plate spring 22, and a support portion 260 for supporting the suspension wire 6 is formed at the intersection of the first spring portion 240 and the second spring portion 250. A positioning hole 222 is formed in the center of each large rectangular piece 220, and a positioning hole 232 is formed in the center of each small rectangular piece 230. A V-shaped notch 226 is provided in each right-angled portion of the support plate spring 22, i.e., the support portion 260. The front end of the suspension wire 6 is inserted through the notch 226 and soldered.

[0042] The bracket 30 is formed into a frame shape with a peripheral wall surrounding a quadrilateral in the upper, lower, left and right directions. The four corners of the bracket 30 are chamfered to form an arc shape. Two protrusions 320 are provided on the front of each side of the quadrilateral of the bracket 30.

[0043] On the left side and right side of the quadrilateral of the bracket 30, one positioning protrusion 330 is provided at the front between the two protrusions 320. In addition, on the upper side and lower side of the quadrilateral, two positioning protrusions 340 are provided at the front between the two protrusions 320. On each side of the quadrilateral of the bracket 30, two positioning protrusions 350 are provided at the back. The front between the two positioning protrusions 340 on each side of the bracket 30 is recessed further to the rear side than the other fronts, and the recess 115 of the housing 10 is accommodated in this portion.

[0044] The partition plate 40 has a rectangular plate with four corners rounded into an arc shape. The outline of the partition plate 40 when viewed from the Z direction is the same as that of the bracket 30. A through hole 411 in the shape of a perfect circle is formed in the center of the partition plate 40. Positioning holes 410 are provided at each position of the chamfered portion and the boundary of the straight portion of the four corners of the partition plate 40. The magnet 420 is in the shape of a rectangular parallelepiped extending in one direction.

[0045] The coil substrate 50 is a quadrilateral annular plate. Coils 510 are provided inside each end side of the quadrilateral of the coil substrate 50. Each coil 510 is composed of two straight portions extending along each side and a semicircular portion of the two straight portions. On each side, two coils 510 are arranged side by side along the side. Circular holes 506 are respectively provided at the four corners of the coil substrate 50. The solder suspension wire 6 is inserted through the circular hole 506.

[0046] The second FPC 60 supplies the current supplied from the outside of the actuator 3 to the image sensor 2 of the sensor substrate 70 and each coil 510 of the coil substrate 50. The second FPC 60 is a thin plate symmetrical at one point, and has a main body 61 and a pair of connecting parts 62 extending from the periphery of the main body 61. Each connecting part 62 has a straight line part 64 extending in a straight line, a connecting part 65 connecting the main body 61 and the side part of one end side of the straight line part 64, and a front end part 66 extending from the side part of the other end side of the straight line part 64 on the same side as the connecting part 65. The front end part 66 is substantially T-shaped.

[0047] like Figure 8 As shown, in the second FPC 60, the first ridgeline 621 at the boundary between the main body 61 and the connecting portion 62, the second ridgeline 622 in the connecting portion 62, and the third ridgeline 623 are bent to form a three-dimensional shape. The first ridgeline 621 is formed at the connecting portion 65. The second ridgeline 622 is formed at the center of the extending direction of the straight portion 64. The third ridgeline 623 is formed at the front end portion 66. Figure 8 The first and second ridgelines 621 and 622 of the single-dash line represent valley fold lines (lines that bend toward the front of the paper), and the third ridgeline 623 of the double-dash line represents a mountain fold line (a line that bends toward the depth of the paper).

[0048] like Figure 7 As shown in (A), the second FPC 60 is bent into a box shape with the main body 61 as the bottom surface and the straight line 64 as the side surface, and the two second ridges 622 are located at the corners of the quadrilateral. The first ridge 621 is located at the end of one side of the corner of the second ridge 622, and the third ridge 623 is located at the end of the other side. The front end 66 protrudes outward at a substantially right angle from the third ridge 623.

[0049] like Figure 7 As shown in (B), a plurality of terminals 620 are arranged in parallel along the X direction on the rear surface of the front end portion 66. In addition, a plurality of terminals 629 and a driver IC 520 are provided on the rear surface of the main body portion 61 inside the end side.

[0050] The driver IC 520 is an IC that manages current control with a built-in position sensor 52, and controls the amount and direction of current supply to the coil 510. Therefore, the driver IC 520 is configured at a position corresponding to the coil 510. The position sensor 52 is a Hall element in the present embodiment, but may also be an MR element or the like. When the edge portion of the main body 61 of the second FPC 60 is divided into eight regions, namely, the upper left side, the upper right side, the upper right side, the lower right side, the lower left side, the lower left side, and the upper left side, the connection portion 65 of the second FPC 60 is located at the upper right side and the lower left side, and the driver IC 520 (position sensor 52) is located at the upper left side, the upper left side, the lower right side, and the lower left side. That is, the wiring of the main body 61 of the second FPC 60 is concentrated in the region where the driver IC 520 (position sensor 52) is present, so it is preferred that the connection portion 65 is provided in the region where the driver IC 520 (position sensor 52) is present.

[0051] exist Figure 3 as well as Figure 4 In the figure, the sensor substrate 70 is a rectangular plate, but is fixed to the main body 61 of the second FPC 60 from the same rear side as the driver IC 520. Therefore, the sensor substrate 70 corresponds to the position of the driver IC 520, so that the roughly L-shaped portion including the two corners on the diagonal of the rectangular plate is notched inward, and has a notch 710. The shape of the notch changes according to the position of the driver IC 520. The driver IC 520 of the position sensor 52 arranged behind the main body 61 is exposed to the rear side through the notch 710 of the sensor substrate 70. The image sensor 2 is fixed in the center of the front of the sensor substrate 70. As shown Figure 4 As shown, a plurality of terminals 729 are provided on the inner side of the rear end of the sensor substrate 70 so as to correspond to the terminals 629. The terminals 729 of the sensor substrate 70 are electrically connected to the terminals 629 of the main body 61 of the second FPC 60.

[0052] The frame 80 is formed in a quadrilateral ring shape. A groove 804 recessed inward is provided on the right side of the upper edge and the left side of the lower edge of the quadrilateral frame 80. In addition, positioning protrusions 810 are provided one by one on the left and right side edges at the back of the frame 80, and positioning protrusions 810 are provided one by one on both sides of each groove 804.

[0053] The bottom plate 90 is formed in a rectangular plate shape. A notch 904 is provided on the left side of the upper edge and the right side of the lower edge of the quadrilateral bottom plate 90. A positioning hole 910 is provided on each of the left and right side edges of the bottom plate 90, and a positioning hole 910 is provided on each of the two sides of each notch 904.

[0054] The support plate spring 22, bracket 30, partition plate 40 and magnet 420 of the above parts are integrated as the fixed part of the image sensor driving device, and the coil substrate 50, second FPC 60 and sensor substrate 70 are integrated as the movable part of the image sensor driving device. Therefore, the support plate spring 22 of the fixed part and the coil substrate 50 of the movable part are connected by four suspension wires 6. In addition, the frame, housing 10, frame 80 and bottom plate 90 as the actuator 3 are integrated.

[0055] If described in more detail, the support plate spring 22 is embedded in the positioning protrusions 330 and 340 of the bracket 30 through the positioning holes 222 and 232 of the support plate spring 22, and is fixed to the front of the bracket 30. The partition plate 40 is embedded in the positioning protrusion 350 of the bracket 30 through the positioning hole 410 of the partition plate 40, and is fixed to the rear of the bracket 30. The magnet 420 is fixed to the inner side position of each end edge of the rear side of the partition plate 40. Therefore, the magnet 420 is supported on the bracket 30 via the partition plate 40.

[0056] The bottom plate 90 fits into the positioning protrusions 810 of the frame 80 in the positioning holes 910 of the bottom plate 90 to fix the frame 80 from the rear side. The outer edge of the frame 80 on the front side of the bottom plate 90 is fixed to the rear edge of the side wall 102 of the housing 10.

[0057] The main body 61 of the second FPC 60 of the movable part is arranged between the coil substrate 50 and the sensor substrate 70. The sensor substrate 70 is fixed to the main body 61 of the second FPC 60 from the rear side. The coil substrate 50 is fixed to the main body 61 of the second FPC 60 from the front side. The coil substrate 50 and the sensor substrate 70 are both electrically connected at the rear side of the second FPC 60.

[0058] The image sensor driving device is accommodated in a space surrounded by the housing 10 and the bottom plate 90. In the housing 10, the front of the protrusion 320 of the bracket 30 is fixed to the rear of the front wall 100 of the housing 10. The bracket 30 surrounds the AF motor 110 of the lens driving device from the outside. There is a gap between the through hole 311 of the bracket 30 and the AF motor 110. The gap is used to adjust the position and posture of the AF motor 110 during the assembly operation. The image sensor 2 on the sensor substrate 70 is exposed to the front through the through hole 611 of the main body 61 of the second FPC 60 and the through hole 511 of the coil substrate 50.

[0059] like Fig. 9As shown, the front end of the suspension wire 6 is inserted into the notch 226 of the support plate spring 22, and the rear end thereof is inserted into the circular hole 506 of the coil substrate 50, and the inserted front side portion is fixed by the solder 20. The support plate spring 22 is fixed to the front of the bracket 30 by the large rectangular piece 220 and the small rectangular piece 230, but the first spring portion 240 and the second spring portion 250 including the support portion 260 are in a state of protruding outward from the bracket 30 and floating. Therefore, in the event of an impact, the first spring portion 240 and the second spring portion 250 are elastically deformed, thereby being able to suppress the impact transmitted to the suspension wire 6. In order to realize this structure, as shown in FIG. Fig. 9 As shown, the height of the protrusion 320 of the bracket 30 is larger than the amount by which the front end of the suspension wire 6 protrudes from the support portion 260. There are gaps between the four corners of the side wall 102 of the housing 10 and the chamfered portions of the four corners of the bracket 30. The suspension wire 6 is arranged in the gaps at the four corners and extends between the support leaf spring 22 and the coil substrate 50 through the gaps at the four corners.

[0060] like Figure 2 As shown, the top 121 and the long plate portion 122 of the first FPC 12 are exposed to the front and left sides of the housing 10. The front end portion 66 of the connecting portion 62 of the second FPC 60 protrudes to the upper and lower sides of the housing 10 through the groove 804 of the frame 80 and the notch 904 of the bottom plate 90. The terminal 120 of the first FPC 12 and the terminal 620 of the second FPC 60 are electrically connected to the substrate of the external smartphone 5.

[0061] like Fig.10 As shown, each magnet 420, each coil 510, each position sensor 52 and each driver IC 520 are distinguished and configured in the following manner. Magnet 420A is configured on the +X (left) side, magnet 420B is configured on the -X (right) side, magnet 420C is configured on the -Y (lower) side, and magnet 420D is configured on the +Y (upper) side. Coil 510A1 is configured on the lower left side. Coil 510A2, position sensor 52A2 and driver IC 520A2 are configured on the upper left side. Coil 510B1 is configured on the upper right side. Coil 510B2, position sensor 52B2 and driver IC 520B2 are configured on the lower right side. Coil 510C1, position sensor 52C1 and driver IC 520C1 are configured on the lower right side. Coil 510C2 is configured on the lower left side. Coil 510D1, position sensor 52D1 and driver IC 520D1 are configured on the upper left side. The coil D2 is arranged on the upper right side.

[0062] Each magnet 420 distinguishes magnetic properties on the inside and outside, and is magnetized so that the surface facing the -Z (rear) side located on the inside is the S pole, and the surface facing the -Z (rear) side located on the inside is the N pole. The magnetic poles can also be opposite. When no current flows through the coil 510, a straight portion of each coil 510 is opposite to the rear side surface located on the inside of each magnet, and the other straight portion is opposite to the rear side surface located on the outside. In addition, each position sensor 52 is located on the boundary line between the S pole and the N pole of the opposing magnet 420. This position is called the initial position.

[0063] Under the control of the driving IC 520, if a specified current is supplied to the coil 510, an electromagnetic force in the X direction is generated for the coils 510A1, 510A2, 510B1, and 510B2 by the magnetic action between the coil 510 and the magnet 420. An electromagnetic force in the Y direction is generated for the coils 510C1, 510C2, 510D1, and 510D2. As a result, the movable body moves and rotates relative to the fixed body against the elastic force of the suspension wire 6. For example, if a clockwise current flows through the coils 510A1 and 510A2 and a counterclockwise current flows through the coils 510B1 and 510B2, the movable body moves in the -X direction, and if reverse currents flow respectively, the movable body moves in the +X direction. If a clockwise current flows through the coils 510C1 and 510C2, and a counterclockwise current flows through the coils 510D1 and 510D2, the movable body moves in the +Y direction, and if a reverse current flows through each of them, the movable body moves in the -Y direction. If a clockwise current flows through the coils 510A1, 510B1, 510C1, and 510D1, and a counterclockwise current flows through the coils 510A2, 510B2, 510C2, and 510D2, the movable body rotates in the clockwise direction, and if a reverse current flows through each of them, the movable body rotates in the counterclockwise direction.

[0064] exist Fig.10 In the embodiment, four position sensors 52A2, 52B2, 52C1 and 52D1 are grouped into two pairs. One pair of position sensors 52A2 and 52B2 detects displacement of the movable part in the X direction, and the other pair of position sensors 52C2 and 52D2 detects displacement of the movable part in the Y direction.

[0065] If two coils 510 arranged at positions facing each other in a forward direction corresponding to the two opposite sides are set as a coil group, a position sensor 52 is respectively provided corresponding to each group of coils 510, and the position sensor 52 is arranged at a position corresponding to one coil 510 in each group of coils 510. That is, the position sensor 52A2 sets the two coils 510A2 and the coil 510B1 arranged at the positions facing each other in a forward direction as a coil group, and is arranged corresponding to the coil group. Thus, the position sensor 52A2 is arranged at a position corresponding to the coil 510A2 in the coil group. The same is true for the other position sensors 52B2, 52C1 and 52D1. The position sensors 52 are all arranged at a position away from the connecting portion 65, and the position sensor 52 is not arranged near the connecting portion 65.

[0066] The driver IC 520 receives the output signal of the position sensor 52 and determines the position of the movable part based on the positive and negative sign and amplitude of the output signal. Based on the result, the driver IC 520 flows a predetermined current to the coil 510 .

[0067] Next, the output of the position sensor when the movable part moves or rotates will be described. Fig.11 As shown, when the movable part moves from the initial position to a position away from D along the +X (left) direction, a signal +D corresponding to the displacement amount +D on the +X side is output from position sensors 52A2 and 52B2, and the signal output from position sensors 52C1 and 52D1 is 0.

[0068] In addition, if Fig.12 As shown, when the movable part moves from the initial position to a position away from D along the +Y (upward) direction, a signal +D corresponding to the displacement amount +D on the +Y side is output from position sensors 52C1 and 52D1, and the signal output from position sensors 52A2 and 52B2 is 0.

[0069] In addition, if Fig.13 As shown in FIG. 1 , when the movable part rotates clockwise by an angle θ from the initial position, a signal +θ corresponding to the displacement in the +X direction is output from the position sensor 52A2, and a signal -θ corresponding to the displacement in the -X direction is output from the position sensor 52B2. In addition, a signal +θ corresponding to the displacement in the +Y direction is output from the position sensor 52C1, and a signal -θ corresponding to the displacement in the -Y direction is output from the position sensor 52D1. If the outputs of the position sensors 52A2 and 52B2 are added together, the value is 0, and if the outputs of the position sensors 52C1 and 52D1 are added together, the value is 0, so it is determined that the rotation has occurred.

[0070] Assume that position sensor 52B2 is positioned as position sensor 52B1 at a position facing position sensor 52A2. Also, position sensor 52D1 is positioned as position sensor 52D2 at a position facing position sensor 52C1. In this case, the outputs of position sensor 52A2 and position sensor 52B1 are both +θ, which is judged as a displacement in the +X direction. Similarly, the outputs of position sensor 52C1 and position sensor 52D2 are both +θ, which is judged as a displacement in the +Y direction. Therefore, it is impossible to judge the rotation.

[0071] That is, the two position sensors 52 arranged corresponding to the two opposing sides are arranged so that when the image sensor 2 is rotated, one is on the + side and the other is displaced toward the - side. In the case of a configuration in which the image sensor 2 is not rotated, the present invention is not limited to this.

[0072] When the movable portion moves in combination with displacement in the X direction and the Y direction and rotation, a signal obtained by adding the above is output from the position sensor 52 .

[0073] The above are details of this embodiment. According to this embodiment, the following effects are obtained.

[0074] In the present embodiment, the actuator 3 includes: a sensor substrate 70 having an image sensor 2 on the front; a coil substrate 50 having a coil 510 for driving the image sensor 2 and provided with a first through hole 511; and a second FPC 60 having a main body 61 and a connecting portion 62 extending from the periphery of the main body 61 and connected to the outside, and a second through hole 611 being provided in the main body 61. Thus, the sensor substrate 70 is fixed to the main body 61 from the rear side, the coil substrate 50 is fixed to the main body 61 from the front side, and the image sensor 2 is exposed to the front through the first through hole 511 and the second through hole 611. Thus, the sensor substrate 70 is fixed to the rear side of the second FPC 60, and the coil substrate 50 is fixed to the front side of the second FPC 60, so that they can be directly electrically connected to the second FPC 60 respectively. Thus, it is possible to provide the actuator 3 , the camera module 4 , and the camera-mounted device, which can efficiently perform power supply wiring of the device having a mechanism for performing shake correction by moving the image sensor 2 .

[0075] In addition, in the present embodiment, the actuator 3 includes: a lens driving device having a driving mechanism for driving the lens body 1 forward and backward in the optical axis direction and fixed to the housing 10; a movable portion, which is arranged on the rear side of the lens driving device together with the image sensor 2; a bracket 30, which is fixed to the housing 10 and surrounds the lens driving device from the outside; a support leaf spring 22, which is fixed to the front of the bracket 30; and a plurality of suspension wires 6, which connect the support leaf spring 22 and the movable portion. Therefore, the impact on the support leaf spring 22 is mitigated, so that the suspension wire 6 is not easily damaged. Thus, it is possible to provide an actuator 3, a camera module 4, and a camera mounting device in which the suspension wire 6 supporting the movable portion is not easily damaged.

[0076] In addition, in the present embodiment, the actuator 3 includes a fixed portion and a movable portion including a rectangular image sensor 2, a coil 510, and a position sensor 52. The coil 510 is arranged at a position corresponding to each side of the image sensor 2, and two coils 510 are arranged in parallel along each of two opposing sides. If two coils 510 arranged at positions facing each other in a positive direction corresponding to each of the two opposing sides are set as one coil group, one position sensor 52 is provided corresponding to each group of the coils. The position sensor 52 is arranged at a position corresponding to one coil 510 in each group of the coils. Therefore, the position sensor 52 can detect the position and rotation amount of the image sensor 2 in its plane direction. Therefore, the displacement between the position of the movable portion and the target position can be determined based on the output signal of the position sensor 52, and the movable portion can be moved to the target position including rotation while correcting the position displacement. Thus, it is possible to provide an actuator 3, a camera module 4, and a camera mounting device that can control the movement of the movable portion in three-axis directions with high precision.

[0077] In addition, in the present embodiment, the actuator 3 includes: a housing 10 having a through hole 101 in the center; a lens driving device having a lens driving mechanism for driving the lens body 1 in the front and rear of the optical axis direction and a first FPC 12, which is exposed from the through hole 101 and fixed to the housing 10; and an image sensor driving device having an image sensor driving mechanism for driving the image sensor 2 in directions different from the optical axis direction, namely, the X direction and the Y direction, which is arranged on the rear side of the lens driving device. Thus, the first FPC 12 has a long plate portion 122 extending along the outer side of the housing 10 and a short plate portion 123 entering the inner side of the housing 10 from the through hole 101, and the short plate portion 123 is electrically connected to the lens driving device. Thus, in the assembly operation of the actuator 3, the wiring operation of the first FPC 12 to the lens driving mechanism and the wiring operation to the image sensor driving mechanism can be performed separately and independently. Thus, an actuator 3, a camera module 4, and a camera mounting device with high assembly efficiency can be provided.

[0078] In the above embodiment, the two position sensors 52 on the two opposing sides are arranged at positions diagonally opposite to each other, such as the position sensor 52A2 and the position sensor 52B2, and the position sensor 52C1 and the position sensor 52D1. Fig.14 As shown, position sensors 52A1 and 52A2, and position sensors 52C1 and 52C2 are arranged in parallel along one side. Alternatively, two position sensors 52 on two opposing sides may be arranged at an oblique position, and two position sensors 52 on another two opposing sides may be arranged in parallel along one side.

[0079] In addition, four cable protection parts for protecting the suspension wire 6 may be provided at the chamfered parts of the four corners of the bracket 30. The four cable protection parts have a half-split tubular curved surface. The suspension wire 6 extends between the support leaf spring 22 and the coil substrate 50 of the movable part through the curved surface of the four cable protection parts. In addition, a resin having viscoelasticity such as a buffer glue may be provided between the bracket 30 and the suspension wire 6.

[0080] In addition, the coil 510 may also be arranged at a position corresponding to each side of the image sensor 2, and may be arranged, for example, as follows. On one of the two opposing sides, i.e., the left side and the right side, two coils 510A1 and coil 510A2, and coils 510B1 and coils 510B2 are arranged side by side along the sides, respectively. In addition, on the other two opposing sides, i.e., the lower side and the upper side, one coil 510C and one coil 510D are arranged, respectively. At this time, the two coils 510A2 and coil 510B1, and coils 510A1 and coils 510B2 arranged at positions facing each other in a forward direction corresponding to the two opposing sides are respectively set as one coil group. Corresponding to each coil group, one position sensor 52A1 and 52B2 are respectively provided. The position sensors 52A2 and 52B2 are arranged at positions corresponding to one coil 510A2 and coil 510B2 in each coil group. In addition, two coils 510C and 510D arranged at positions facing each other in the forward direction corresponding to the two opposing sides are set as one coil group. For example, a position sensor 52C is provided corresponding to the coil group. The position sensor 52C is arranged at a position corresponding to the coil 510C in the coil group.

[0081] When the movable part is moved in the X direction, a predetermined current flows through the coils 510A1, 510A2, 510B1, and 510B2 in the same manner as described above. When the movable part is moved in the Y direction, a predetermined current flows through the coils 510C and 510D. When the movable part is rotated in the θ direction, no current flows through the coils 510C and 510D, and only the coils 510A1, 510A2, 510B1, and 510B2 flow with the same current as described above.

[0082] At this time, the position sensor 52A2 and the position sensor 52B2 can detect the displacement amount in the X direction and the rotation in the θ direction. In addition, the position sensor 52C detects the displacement amount in the Y direction.

Claims

1. An actuator, It is characterized in that It has a fixed part and a movable part including a plurality of magnets. The movable part has a coil and a position sensor facing the magnet, and is used to carry a rectangular image sensor. The coils are arranged at positions corresponding to the respective sides of the rectangle of the image sensor, and two coils are arranged in parallel along each side. When two coils disposed at positions facing each other in a positive direction corresponding to two opposing sides are set as one coil group, one position sensor is provided at a position corresponding to one coil in each coil group. On the surface of each magnet corresponding to the coil, the inner part of the magnet is excited into one of the N pole and the S pole, and the outer part of the magnet is excited into the other of the N pole and the S pole. Each of the position sensors is located on a boundary line between the S pole and the N pole of the opposing magnet.

2. The actuator according to claim 1, It is characterized in that Each of the coils is composed of two straight line portions extending along each side and a semicircular portion connecting the two straight line portions. One of the straight line portions of each of the coils faces a surface of the coil located inside the magnet, and the other of the straight line portions faces a surface of the coil located outside the magnet.

3. The actuator according to claim 1, It is characterized in that The two position sensors arranged corresponding to one of the two opposing sides are arranged at positions oblique to each other.

4. The actuator according to claim 3, It is characterized in that Two position sensors are arranged corresponding to the other two opposing sides and are arranged at positions oblique to each other.

5. The actuator according to claim 1, It is characterized in that The two position sensors arranged corresponding to one of the two opposing sides are arranged in parallel along one of the two sides.

6. The actuator according to claim 3 or 5, It is characterized in that The two position sensors arranged corresponding to the other of the two opposing sides are arranged in parallel along one of the two sides.

7. The actuator according to claim 1, It is characterized in that Also has FPC, The FPC has a main body portion electrically connected to the image sensor and two connecting portions extending from the periphery of the main body portion and connected to the outside. The position sensor is provided at a position away from a connection position between the main body and the two connection parts. 8 . A camera module comprising the actuator according to claim 1 . 9 . A camera-mounted device comprising the camera module according to claim 8 .

Images