Blade driving device, camera device, and electronic device

Abstract

The present invention provides a blade driving device with high spatial efficiency of electromagnetic force generation. The blade driving device (1) defines a central axis O and comprises: a plurality of blades (11) arranged around the central axis O; a plurality of groups, each group having a magnet (31) and at least two coils (410), arranged at intervals along the circumference of a circle centered on the central axis O, the winding axial direction of the coil (410) and the normal direction of the opposite surface of the magnet (31) facing the coil (410) are oriented in the direction of the central axis O, and when observed from the radial direction of the circle, the magnetic poles formed on the opposite surface are flipped at the position corresponding to the center of each coil (410), and each group generates an electromagnetic force along the circumferential direction of the circle to drive the blade (11). The present invention also provides a camera device and an electronic device.

Description

Technical Field

[0001] The present invention relates to a blade driving device, a camera device and an electronic device used in electronic devices such as a smart phone. Background Art

[0002] Various technologies have been proposed for adjusting the amount of light entering the lens by using the blades of a sliding camera device. The camera module disclosed in Patent Document 1 has three blades arranged around the incident hole, and the three blades are driven to change the amount of light entering the lens. The camera module has three drive coils on the FPC (Flexible Printed Circuits) on the bottom surface of the shell that holds the blades, and three drive magnets on the movable ring opposite to the shell. The electromagnetic force generated by the drive coils and the drive magnets is used to rotate the movable ring around the optical axis to move the blades. The aperture mechanism device disclosed in Patent Document 2 has two roughly L-shaped blades called "blades" arranged around the incident hole, and the two blades are driven to change the amount of light entering the lens. The aperture mechanism device has three coils on the FPC on the bottom surface of the base, and three permanent magnets on the rotating ring on the upper side of the base. The electromagnetic force generated by the coils and the permanent magnets is used to rotate the rotating ring around the optical axis to drive the blades.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1 China 110858048A Publication Patent Gazette

[0006] Patent Document 2: Korean Patent Publication No. 2018-0105970A Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, the technology described in Patent Document 1 and Patent Document 2 has a structure in which a plurality of groups are arranged around the incident hole, wherein one group includes a coil and a magnet, and the surface of the magnet opposite to the coil is magnetized into two different magnetic poles. There is a problem in that the spatial efficiency of the electromagnetic force is low.

[0009] The present invention has been made in view of the above problem, and an object of the present invention is to provide a blade driving device having high spatial efficiency in generating electromagnetic force.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, a blade drive device as a preferred embodiment of the present invention is characterized in that a central axis is defined, and it has: a plurality of blades arranged around the central axis; and a plurality of groups, each group having at least two coils arranged on a coil substrate for embedding the coils, adjacent to each other and arranged side by side along the circumferential direction of a circle centered on the central axis, and magnets consisting of a first magnet sheet and two second magnet sheets arranged opposite to the coils, each group being arranged at intervals along the circumference of a circle centered on the central axis, and the circumferential width of the second magnet sheets respectively arranged at both ends of the magnets is the width of the first magnet sheets arranged between the second magnet sheets. The circumferential width of the stone piece is to half the width, the first and second magnet pieces are magnetized along the direction of the central axis, and the magnetic poles in the plate surface direction of the adjacent first and second magnet pieces, that is, the direction of the central axis, become opposite magnetic poles, the winding axial direction of the coil and the normal direction of the opposite surface of the magnet opposite to the coil are along the direction of the central axis, each of the coils has a straight line portion along the radial direction of the circle, and when observed from the radial direction of the circle, the magnetic poles formed on the opposite surface are flipped at a position corresponding to the center of each coil, and each group generates an electromagnetic force along the circumferential direction of the circle to drive the blades.

[0012] In this aspect, the magnet may be sandwiched between at least two coils of each group disposed on the front side in the central axis direction and at least two coils disposed on the rear side in the central axis direction.

[0013] Alternatively, the coils may be connected and arranged side by side along the circumferential direction of the circle when viewed from the central axis.

[0014] Furthermore, when viewed from the central axis direction, two or more of the coils may be linearly connected and arranged side by side.

[0015] Alternatively, in the parallel direction of the coils, the area of ​​the magnetized portion of one of the poles located at both ends of the magnet may be smaller than the area of ​​the magnetized portion of one of the poles located outside the two ends of the magnet.

[0016] Furthermore, the linear portions of the coils may face the opposing surfaces of the magnets that form the magnetic poles.

[0017] Alternatively, it may be provided with a fixed portion and a movable ring, wherein the movable ring is supported so as to be rotatable about the central axis relative to the fixed portion, and the blades are driven by the rotation, and for the coil and the magnet, one of them is arranged at the fixed portion, and the other is arranged at the movable ring.

[0018] A camera device according to another preferred embodiment of the present invention is characterized by including the above-mentioned blade driving device.

[0019] Another preferred embodiment of the present invention is an electronic device comprising the camera device described above.

[0020] Effects of the Invention

[0021] The blade drive device of the present invention defines a central axis and comprises: a plurality of blades arranged around the central axis; and a plurality of groups having a magnet and at least two coils, which are arranged at intervals along the circumference of a circle centered on the central axis, the winding axial direction of the coil and the normal direction of the opposing surface of the magnet facing the coil are oriented in the direction of the central axis, and when observed from the radial direction of the circle, the magnetic poles formed on the opposing surface are flipped at a position corresponding to the center of each coil, and each group generates an electromagnetic force along the circumferential direction of the circle to drive the blade. Each of the plurality of groups has at least two coils. Thus, a blade drive device with high spatial efficiency in the generation of electromagnetic force can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of a smartphone 9 equipped with a camera device 8 including the blade drive device 1 as one embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A stereoscopic view of the blade driving device 1 and the lens driving device 5.

[0024] Figure 3 yes Figure 2 A three-dimensional view of the blade drive device 1.

[0025] Figure 4 yes Figure 3 A perspective view of an exploded blade driving device 1.

[0026] Figure 5 is from Figure 3 The shroud 10, the blades 11 and the fixing plate 12 are removed from the figure.

[0027] Figure 6 is from Figure 5 The front coil substrate 20 is removed.

[0028] Figure 7 is from Figure 6 The figure shows that the magnet pieces 311 and 312 are removed. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, a camera device 8 including the blade drive device 1 according to one embodiment of the present invention is accommodated in a smartphone 9 .

[0030] The camera device 8 includes a lens body 7 , an image sensor 6 that converts light from the lens body 7 into an electric signal, a lens driving device 5 that drives the lens body 7 , and a blade driving device 1 that drives a blade 11 disposed in front of the lens body 7 .

[0031] Hereinafter, the direction in which light from the subject is incident 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 of the optical axis of the lens body 15, which is the subject side, is sometimes referred to as the front side, and the Z side, which is the side opposite to the subject and on which the image sensor 16 is provided, is sometimes referred to as the rear side.

[0032] like Figure 2 As shown, the lens driving device 5 has a lens carrier 70 inside thereof, and the lens carrier 70 holds the lens body 7. Metal receiving parts 74 and 75 are provided on the +Y side and -Y side of the front surface of the lens carrier 70. The receiving parts 74 and 75 extend toward the +Z side. The lens driving device 5 supports the metal parts 94 and 95 protruding toward the -Y side and +Y side of the blade driving device 1 through the receiving parts 74 and 75, and supplies power to the blade driving device 1 through the receiving parts 74 and 75 and the metal parts 94 and 95. The blade driving device 1 is configured so that the optical axis of the lens body 7 becomes the central axis O of the blade driving device 1, and is mounted on the lens carrier 70. The central axis O is an axis that passes through the center of the blade driving device 1 along the Z direction, and the central axis direction is the same as the Z direction. In addition, the central axis direction is also the front-back direction.

[0033] like Figure 4 As shown, the blade driving device 1 comprises a cover 10, four blades 11, a fixing plate 12, a front coil substrate 20, a movable ring 21, four plate springs 30, four magnets 31, a rear coil substrate 40, a circuit substrate 41 and a base 42. Among them, the cover 10, the fixing plate 12, the front coil substrate 20, the rear coil substrate 40, the circuit substrate 41 and the base 42 constitute a fixed part that is not movable relative to the lens carrier 70.

[0034] The cover 10 is in the shape of a circular plate with the central axis O as the center. The blade 11 is a flat plate, and four blades 11 of the same shape are arranged at 90 degree intervals. A fixed hole 113 and a movable hole 114 are provided in a protrusion protruding from the outer edge of the blade 11. The fixed hole 113 is circular. The movable hole 114 extends in a direction intermediate between the radial direction and the tangential direction of the circumference. An opening is formed on the inner circumference of the four blades 11, and the size of the opening is controlled by rotating the blade 11 with the fixed hole 113 as the center, thereby controlling the amount of light entering from the subject through the lens body 7 to reach the image sensor 6.

[0035] The fixing plate 12 has a front side wall portion 127, an inner peripheral wall portion 128 and an outer peripheral wall portion 129. A fixing pin 123 and a long hole 124 are respectively provided at positions of the outer peripheral edges of the front side wall portion 127 near the +X side, -X side, +Y side and -Y side. The fixing pin 123 and the long hole 124 are arranged close to each other along the tangent direction of the circle, and the long hole 124 extends along the tangent direction of the circle. In addition, holes 120 are respectively provided at the inner peripheral edges of the +X side and -X side of the front side wall portion 127. The inner peripheral wall portion 128 and the outer peripheral wall portion 129 extend from the inner peripheral edge and the outer peripheral edge of the front side wall portion 127 to the -Z side, and the fixing plate 12 is observed from the central axis in an annular shape with the central axis O as the center.

[0036] The front coil substrate 20 has an annular plate shape centered on the central axis O. Notches 202 are provided at the +X side, the −X side, the +Y side, and the −Y side of the outer circumference of the front coil substrate 20 .

[0037] Three coils 410 are embedded in each of the +X+Y side, +XY side, -X+Y side, and -XY side of the front coil substrate 20. The three coils 410 are adjacent to each other along the circumferential direction. Each coil 410 is formed with the central axial direction as the winding axis and has a straight portion along the approximate radial direction.

[0038] The connection parts 203 are provided at the +X side and -X side of the inner circumference of the front coil substrate 20. The holes 120 of the fixing plate 12 are provided at positions corresponding to the connection parts 203. Current flows from one connection part 203 through each coil 410 arranged in the front coil substrate 20 to reach the other connection part 203.

[0039] The movable ring 21 is in the shape of a ring with front and rear widths. There are respectively platforms 212 protruding forward on the outer peripheries of the +X side, -X side, +Y side and -Y side of the front surface of the movable ring 21, and each platform 212 is also provided with a movable pin 214 protruding forward. Slits 218 are provided along the front-to-back direction toward the radial outer side of the movable ring 21 on the +X side, -X side, +Y side and -Y side of the inner peripheral wall of the movable ring 21. Protrusions 219 protruding toward the inner side are provided on both sides of the slit 218.

[0040] The plate spring 30 includes an inner edge portion 32, an outer edge portion 33, and an arm portion 34 elastically connecting them. The arm portion 34 is formed of a linear meandering elastic member.

[0041] The magnet 31 is formed by laminating four magnet pieces 311 and 312 in a circular arc shape. The circumferential width of the two magnet pieces 312 at the two ends of the magnet 31 is half the circumferential width of the two central magnet pieces 311. The magnet pieces 311 and 312 of the magnet 31 are magnetized along the front-to-back direction, and the magnetic poles of the adjacent magnet pieces 311 and 312 in the plate surface direction (front-to-back direction, i.e., the central axis) become opposite magnetic poles. Therefore, the area of ​​the magnetized portion of a magnetic pole located at the two ends of the magnet 31 is smaller than the area of ​​the magnetized portion of a magnetic pole located outside the two ends of the magnet 31.

[0042] The rear coil substrate 40 has an annular plate shape centered on the central axis O. Notches 402 are provided at the +X side, the −X side, the +Y side, and the −Y side of the outer circumference of the rear coil substrate 40 .

[0043] Three coils 410 are embedded in each of the +X+Y side, +XY side, -X+Y side, and -XY side of the rear coil substrate 40. The three coils 410 are arranged adjacent to each other along the circumferential direction. Each coil 410 is formed with the central axial direction as the winding axis and has a straight portion in the substantially radial direction.

[0044] Two connecting portions (not shown) are provided at the outer periphery of the +X side on the rear surface of the rear coil substrate 40. Current flows from one connecting portion through each coil 410 arranged in the rear coil substrate 40 to the other connecting portion.

[0045] The circuit substrate 41 is an annular plate with a circular inner side and a rounded quadrilateral outer side. Three wiring parts (not shown) are provided on the +Y side and the Y side of the rear surface of the circuit substrate 41, respectively corresponding to the holes 424. In addition, two wiring parts (not shown) are provided at the outer peripheral position of the +X side of the rear surface. In addition, a Hall IC (not shown) is provided on the front surface of the circuit substrate 41.

[0046] The base 42 is formed by insert molding. The main body of the base 42 is made of resin, and two first metal components 94 , two second metal components 95 , and two third metal components 96 are embedded in the resin.

[0047] The base 42 has an annular bottom plate 420. A column 421 rising toward the +Z side is provided on the +X side, -X side, -Y side, and +Y side of the inner periphery of the bottom plate 420. Three holes 424 are provided on the +Y side and -Y side of the base 42, respectively. The three holes 424 are arranged side by side along the X direction.

[0048] Each first metal component 94 extends between the hole 424 on the right side and the outer edge of the bottom plate 420 when viewed from the outer peripheral side. One end of each first metal component 94 is exposed forward and backward at the hole 424 on the +X side. The other end of each first metal component 94 stands up in a step-like manner at the outer edge of the bottom plate 420 and protrudes outward from the bottom plate 420.

[0049] Each second metal component 95 extends between the hole 424 in the middle and the outer edge of the bottom plate 420. One end of each second metal component 95 is exposed forward and backward at the hole 424 in the middle. The other end of each second metal component 95 rises in a step-like manner at the outer edge of the bottom plate 420 and then protrudes outward from the bottom plate 420.

[0050] Each third metal component 96 extends between the hole 424 on the left side and the column 421 on the +X side or the X side when viewed from the outer peripheral side. One end of each third metal component 96 is exposed frontward and rearward in the hole 424 on the left side when viewed from the outer peripheral side. The other end of each third metal component 96 stands up at the column 421 and extends forward along the column 421. The front end of the standing portion of each third metal component 96 protrudes and is exposed in front of the front edge of the column 421.

[0051] The blade drive device 1 is manufactured in the following manner.

[0052] First, the rear coil substrate 40 is fixed to the front surface of the circuit substrate 41. The rear side solders two connection parts located on the rear surface of the rear coil substrate 40 and two connection parts located on the +X side periphery of the rear surface of the circuit substrate 41. Thus, the output part of the Hall IC (not shown) provided on the circuit substrate 41 is electrically connected to the rear coil substrate 40.

[0053] Next, the circuit substrate 41 is fixed to the front surface of the bottom plate 420 of the base 42. The first metal component 94, the second metal component 95, and the third metal component 96 are soldered to the connection part on the rear side of the circuit substrate 41 through the hole 424 of the base 42. Thus, the Hall IC (not shown) provided on the circuit substrate 41 is electrically connected to the outside of the blade drive device 1 through the first metal component 94 and the second metal component 95, and the output part of the Hall IC is also electrically connected to the third metal component 96. In addition, by providing the cutouts 402 on the +Y side and the -Y side, the rear coil substrate 41 can be prevented from interfering with the first metal component 94 and the second metal component 95, while increasing the size of the coil 410 in the radial direction.

[0054] Another method is to embed the magnet 31 between the two protrusions 219 between the adjacent gaps 218 of the movable ring 21, and fix the movable ring 21 and the magnet 31. The outer edge 33 of the plate spring 30 is inserted and fixed in the gap 218. The movable ring 21 with the magnet 31 installed is arranged on the base 42, and the inner edge 32 of the plate spring 30 is fixed to the column 421 of the base 42. At this time, the movable ring 21 is supported by the plate spring 30 in a floating state relative to the base 42.

[0055] The front coil substrate 20 is fixed in advance on the rear surface of the front wall portion 127 of the fixed plate 12. At this time, the connection portion 203 of the front coil substrate 20 is exposed from the hole 120 of the fixed plate 12. Thus, the movable pin 214 is embedded in the long hole 124 to fix the rear edge of the inner wall portion 128 and the outer wall portion 129 of the fixed plate 12 to the inner periphery and the outer periphery of the bottom plate 420 of the base 42. Through the cutout 202, the front coil substrate 20 can increase the size of the coil 410 in the radial direction without interfering with the movable pin 214. The front coil substrate 20 is soldered and electrically connected to the connection portion 203 at the front end of the third metal component 96 of the base 42 through the hole 120. As a result, the front coil substrate 20 is electrically connected to the output portion of the Hall IC (not shown) provided on the circuit substrate 41.

[0056] Next, the blade 11 is mounted on the fixing plate 12. At this time, the fixing pin 123 of the fixing plate 12 is inserted into the fixing hole 113 of the blade 11, and the movable pin 214 of the movable ring 21 that penetrates the long hole 124 of the fixing plate 12 is inserted into the movable hole 114 of the blade 11. Finally, the cover 10 is mounted on the fixing plate 12.

[0057] After the blade driving device 1 is completed, the receiving portions 74 and 75 of the lens driving device 5 are joined to the rear surfaces of the first metal member 94 and the second metal member 95 exposed to the outside of the base 42 by welding or soldering.

[0058] On the +X side, -X side, +Y side, and -Y side, the three coils 410 of the front coil substrate 20 and the three coils 410 of the rear coil substrate 40 face each other with the magnet 31 sandwiched therebetween. That is, the two plate surfaces of the plate-shaped magnet 31 are opposite surfaces facing the coils 410, and magnetic poles are formed on the opposite surfaces. When the magnet pieces 311 and 312 in each magnet 31 are arranged side by side and are observed from the radial direction of the circle, the magnetic poles formed on the opposite surfaces are flipped at the position corresponding to the center of each coil 410. Therefore, each straight line portion extending in the radial direction of each coil 410 faces the opposite surface of the magnet 31 where the magnetic poles are formed.

[0059] When current is supplied to the coil 410 of the front coil substrate 20 and the rear coil substrate 40 of the blade driving device 1, electromagnetic force is generated in the tangential direction of the circumference through the coil 410 and the magnet 31, and an axial thrust around the central axis O is generated. Due to this thrust, the movable ring 21 rotates relative to the fixed plate 12. With this rotation, the movable pin 214 of the movable ring 21 moves in the long hole 124 of the fixed plate 12 and the movable hole 114 of the blade 11, and the blade 11 rotates around the axis of the fixed pin 123 embedded in the fixed hole 113.

[0060] The above are the details of the present embodiment. The blade drive device 1 of the present embodiment defines a central axis O, and comprises: a plurality of blades 11, which are arranged around the central axis O; and a plurality of groups, each group having a magnet 31 and at least two coils 410, which are arranged at intervals along the circumference of a circle centered on the central axis O, and the winding axis of the coil 410 and the normal direction of the opposite surface of the magnet 31 facing the coil 410 are oriented toward the central axis. When observed from the radial direction of the circle, the magnetic poles formed on the opposite surface are flipped at a position corresponding to the center of each coil 410, and each group generates an electromagnetic force along the circumferential direction of the circle to drive the blades 11. The plurality of groups each have at least two coils 410. Thus, a blade drive device 1 that generates electromagnetic force with high space efficiency can be provided.

[0061] In addition, in the above-mentioned embodiment, the magnet 31 may be formed into two magnetic pole pieces 312 in one group, facing the coils 410 arranged one by one on the front side and the rear side. In addition, the magnet 31 may be formed into one magnetic pole piece 311, facing the two coils 410 arranged on either the front side or the rear side. In this case, in the parallel direction of the coils 410, the ends of the magnet 31 become the minimum combination located at the position corresponding to the center of the coils 410 at both ends. In addition, more than three coils 410 may be used in one group. In addition, the number of coils 410 or the number of magnetic poles on the plate surface of the magnet 31 facing the coils 410 is different for each group. In addition, the number of groups of magnets 41 and coils 40 may be 2 groups, 3 groups, or 5 groups or more.

[0062] In the above-described embodiment, the coil substrate may be provided only on one of the front side and the rear side of the magnet 31 .

[0063] In addition, in the above-mentioned embodiment, the coil 410 may be fixed to the movable ring 3, and the magnet 31 may be fixed to the fixing portion.

[0064] In the above embodiment, the magnets 31 and coils 410 in each group may be connected in a straight line and arranged side by side. In addition, the magnets 31 may not use individual magnet pieces 311 and 312, but may just reverse the magnetization direction.

[0065] Explanation of symbols:

[0066] 1 blade drive device; 3 movable ring; 5 lens drive device; 6 image sensor; 7 lens body; 8 camera device; 9 smart phone; 10 cover; 11 blade; 12 fixing plate; 20 front coil substrate; 21 movable ring; 30 plate spring; 31 magnet; 32 inner edge; 33 outer edge; 34 wrist; 40 rear coil substrate; 41 circuit substrate; 42 base; 70 lens carrier; 7475 receiving part; 94 first metal part; 95 The second metal component; 96 the third metal component; 113 the fixed hole; 114 the movable hole; 120 the hole; 123 the fixed pin; 124 the long hole; 127 the front wall; 128 the inner wall; 129 the outer wall; 202, 402 the cutouts; 203, 403 the wiring parts; 212 the platform; 214 the movable pin; 218 the gap; 219 the protrusion; 311, 312 the magnet sheets; 410 the coil; 420 the bottom plate; 421 the column; 424 the hole.

Claims

1. A blade driving device, characterized in that: Define the central axis and have: a plurality of blades arranged around the central axis; and A plurality of groups, each group having at least two coils adjacent to each other and arranged side by side along the circumference of a circle centered on the central axis, and a magnet consisting of a first magnet sheet and two second magnet sheets arranged opposite to the coils, each group being arranged at intervals along the circumference of a circle centered on the central axis, and the at least two coils being arranged in a coil substrate for embedding the coils, The circumferential width of the second magnet pieces respectively arranged at both ends of the magnet is between half the width of the circumferential width of the first magnet piece arranged between the two second magnet pieces and the circumferential width of the first magnet piece. The first and second magnet pieces are magnetized along the direction of the central axis and are magnetized so that the magnetic poles in the plate surface direction of the adjacent first and second magnet pieces, that is, in the direction of the central axis, become opposite magnetic poles. The winding axial direction of the coil and the normal direction of the surface of the magnet facing the coil are along the direction of the central axis, and each coil has a straight line portion along the radius direction of the circle. When viewed from the radial direction of the circle, the magnetic poles formed on the facing surfaces are reversed at positions corresponding to the centers of the coils. Each of the groups generates an electromagnetic force along the circumferential direction of the circle to drive the blades.

2. The blade driving device according to claim 1, characterized in that: In each of the groups, the magnet is sandwiched between at least two of the coils disposed on the front side in the central axis direction and at least two of the coils disposed on the rear side in the central axis direction.

3. The blade driving device according to claim 1 or 2, characterized in that: The linear portions of the coils face the opposing surfaces of the magnets that form the magnetic poles.

4. The blade driving device according to claim 1, characterized in that: With a fixed part and a movable ring, The movable ring is supported so as to be rotatable relative to the fixed portion about the central axis, and the blades are driven by the rotation. One of the coil and the magnet is arranged at the fixed portion, and the other is arranged at the movable ring.

5. A camera device, characterized in that: A blade driving device according to any one of claims 1 to 4 is provided.

6. An electronic device, characterized in that: A camera device according to claim 5.

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