Blade drive device, camera device, and electronic device

Abstract

The present invention provides a blade drive device capable of configuring a position sensor even in a small space. The blade drive device (1) comprises: a blade (11); four groups, each group comprising a magnet (21) and at least one coil (121) facing the magnet (21), wherein the blade (11) is driven to move by the electromagnetic force generated between the magnet (21) and the coil (121); and a Hall IC (42), which is a magnetic position sensor that senses the strength of the magnetic field of the magnet (21) to detect the position of the magnet (21). The Hall IC (42) is located between two adjacent groups of the four groups. 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 smart phones. Background Art

[0002] Various technologies have been proposed for adjusting the amount of light entering the lens by sliding the blades of a camera device. The camera module disclosed in Patent Document 1 is installed in automobiles, buildings, mobile communication terminals, smartphones, tablet computers, and the like. The camera module has three drive coils on a housing that holds the blades, and three drive magnets on a movable ring opposite the housing. The camera module has a pair of position sensors on either side of one of the three drive coils. The position of the drive coil is detected using the output signal of the position sensors, and the movable ring is rotated around the optical axis to move the blades.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: China 110858048A Publication Patent Gazette Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, in small devices such as smartphones, there is a problem that size constraints are severe, making it difficult to arrange a position sensor around the drive coil.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a blade drive device in which a position sensor can be arranged even in a small space.

[0009] Means for solving problems

[0010] In order to solve the above-mentioned problems, a blade driving device as a preferred embodiment of the present invention is characterized in that it comprises: blades; multiple groups, each having a magnet and at least one coil opposite to the magnet, and generating a thrust to move the blades through the electromagnetic force between the magnet and the coil; and a magnetic field position sensor, which senses the magnetic field of the magnet to detect the position of the magnet, and the magnetic field position sensor is located between two adjacent groups of the multiple groups, or the magnetic field position sensor is configured to replace the coil at a position where one of the coils is originally set among all the coils.

[0011] In this embodiment, the coil may be arranged on a front coil substrate located in front of the magnet and a rear coil substrate located behind the magnet, and the magnetic field position sensor may be arranged in a cutout provided in the rear coil substrate.

[0012] Alternatively, the coil may be arranged on a front coil substrate located in front of the magnet and a rear coil substrate located behind the magnet, and the magnetic field position sensor may be located at a position in the rear coil substrate where the coil was originally set, opposite to the magnet.

[0013] Alternatively, it may include: a fixed part; a movable ring that utilizes the thrust around the optical axis generated by the electromagnetic force to rotate relative to the fixed part to move the blade; and a plurality of plate springs that support the movable ring, the magnetic field position sensor is located between the two adjacent groups of plate springs, and one of the plurality of plate springs is located in front of the magnetic field position sensor.

[0014] A camera device according to another preferred embodiment of the present invention is characterized by including the above-mentioned blade driving device.

[0015] Another preferred embodiment of the present invention provides an electronic device including the camera device described above.

[0016] Effects of the invention

[0017] The blade drive device of the present invention comprises: blades; a plurality of groups each having a magnet and at least one coil facing the magnet, wherein the electromagnetic force generated between the magnet and the coil serves as thrust for moving the blades; and a magnetic field position sensor that senses the magnetic field of the magnet to detect the position of the magnet, wherein the magnetic field position sensor is located between two adjacent groups of the plurality of coil groups, or the magnetic field position sensor is arranged at a position where one of the coils is originally set to replace the coil. Thus, a blade drive device can be provided that can accommodate a position sensor even in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a smartphone 9 equipped with a camera device 8 including the blade drive device 1 and the lens drive device 5 according to one embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A three-dimensional diagram of the blade driving device 1 and the lens driving device 5.

[0020] Figure 3 yes Figure 2 A perspective view of the blade drive device 1.

[0021] Figure 4 yes Figure 3 A perspective view of the blade drive device 1 after decomposition.

[0022] Figure 5 It is from Figure 3 The figure after the cover 10 is removed.

[0023] Figure 6 It is from Figure 5 The figure after removing blade 11.

[0024] Figure 7 It is from Figure 6 Figure after removing the fixing plate 12.

[0025] Figure 8 It is from Figure 7 A diagram showing the front coil substrate 20 removed.

[0026] Figure 9 It is from Figure 8 Figure after removing the movable ring 22.

[0027] Figure 10 Yes Figure 9 Figure 43 of the base.

[0028] Figure 11 This is a diagram showing a rear coil substrate 40 , a Hall IC 42 , and a base 43 of a blade drive device 1 according to another embodiment of the present invention. 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 housed 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 electrical signal, a lens driving device 5 that drives the lens body 7 , and a blade driving device 1 that drives blades 11 disposed in front of the lens body 7 .

[0031] Hereinafter, the direction in which light from the subject is incident will be referred to as the Z direction, the direction perpendicular to the Z direction will be referred to as the X direction, and the direction perpendicular to both the Z and X directions will be referred to as the Y direction. Furthermore, the +Z side of the lens 7, which is the subject side of the optical axis, will sometimes be referred to as the front side, and the -Z side, which is the side opposite to the subject and located on the image sensor 6, will sometimes be referred to as the rear side. Furthermore, the +X side will sometimes be referred to as the upper side, the -X side will sometimes be referred to as the lower side, the +Y side will sometimes be referred to as the left side, and the -Y side will sometimes be referred to as the right side.

[0032] like Figure 2As shown, the lens drive device 5 has a lens carrier 70 inside it, and the lens carrier 70 holds the lens body 7. On the +Y side and -Y side of the front surface of the lens carrier 70, there are provided metal carrier side receiving portions 701 that support the blade drive device 1 and are used to provide power to the blade drive device 1. Blade side receiving portions 953 and 963 are correspondingly provided on the blade drive device 1. The blade drive device 1 is constructed so that the optical axis of the lens body 7 becomes the center of the blade drive device 1. In order to be supported by the carrier side receiving portions 701 and the blade side receiving portions 953 and 963, the blade drive device 1 does not contact the lens body 7. The lens carrier 70 is supported so as to be able to move at least in the optical axis direction of the lens body 7, and the blade drive device 1 moves together with the lens carrier 70 and the lens body 7.

[0033] like Figure 4 As shown, the blade drive device 1 includes a cover 10, four blades 11, a fixed plate 12, a front coil substrate 20, four magnets 21, a movable ring 22, four leaf springs 30, a rear coil substrate 40, a circuit substrate 41, a Hall effect IC 42, and a base 43. The cover 10, fixed plate 12, front coil substrate 20, rear coil substrate 40, circuit substrate 41, Hall effect IC 42, and base 43 constitute a fixed portion that does not move relative to the lens carrier 70.

[0034] The cover 10 is annular. The blades 11 are flat plates, with four blades 11 arranged in a circular pattern. A fixed hole 113 and a movable hole 114 are provided in the roughly rectangular protruding portion of the outer edge of the blades 11. The fixed hole 113 is a perfect circle. The movable hole 114 has a shape that is a perfect circle stretched in the direction of its diameter. An opening is formed on the inner circumference of the four blades 11. By rotating the blades 11 about the fixed hole 113, the size of the opening is controlled, thereby controlling the amount of light from the subject through the lens 7 to reach the image sensor 6.

[0035] The fixed plate 12 includes a disk portion 127, an inner peripheral wall portion 128, and an outer peripheral wall portion 129. A fixing pin 123 and an elongated hole 124 are provided on the outer peripheral edges of the disk portion 127 near the +X side, -X side, +Y side, and Y side, respectively. The fixing pin 123 and the elongated hole 124 are arranged close to the tangent direction of the circle, and the elongated hole 124 extends along the tangent direction of the circle. Furthermore, holes 125 are provided on the inner peripheral edges of the +X+Y side and the +XY side of the disk portion 127, respectively. The inner peripheral wall portion 128 and the outer peripheral wall portion 129 extend from the inner and outer peripheral edges of the disk portion 127 toward the -Z side. Notches 120 are provided on the +Y side and -Y side of the rear end of the outer peripheral wall portion 129.

[0036] The front coil substrate 20 is annular. Two coils 121 are embedded in the +X side, -X side, +Y side and Y side of the through hole in the center of the front coil substrate 20, respectively. The two coils 121 arranged on the +X side and the X side have straight portions that are parallel to the Y direction and extend along the Y direction respectively. The two coils 121 arranged on the +Y side and the Y side have straight portions that are parallel to the X direction and extend along the X direction respectively. The eight coils 121 are arranged side by side at the same height. A wiring portion 201 is provided at the +X+Y side and the +XY side of the inner periphery of the front coil substrate 20. The two wiring portions 201 are electrically connected to each other via the coils 121 arranged in the front coil substrate 20.

[0037] The movable ring 22 is annular. Concave portions 220, recessed toward the outer circumference, are located on the +X, -X, +Y, and Y sides of the inner circumference of the movable ring 22. Magnets 21 are housed and secured in these recesses 220, respectively. Magnets 21 are magnetized in the front-to-back direction, with opposite magnetic poles on the inner and outer halves.

[0038] On the outer periphery of the front of the movable ring 22, on the +X, -X, +Y, and Y sides, there are respectively protruding forward steps 222. Each step 222 is also provided with a forward-protruding movable pin 224. Slits 223 are respectively provided on the +X+Y, +XY, -X+Y, and XY sides of the inner circumferential wall of the movable ring 22, that is, between the recesses 220. The slits 223 are recessed radially outward of the movable ring 22.

[0039] The plate spring 30 includes two plate-like portions and an arm portion elastically connected to the two plate-like portions. The arm portion is formed of a linear, meandering elastic member.

[0040] The rear coil substrate 40 is annular. Two coils 121 are respectively embedded in the +X side, -X side, +Y side and Y side of the through hole in the center of the rear coil substrate 40. The two coils 121 arranged on the +X side and the X side have straight sections extending along the Y direction and side by side. The two coils 121 arranged on the +Y side and the Y side have straight sections extending along the X direction and side by side. The eight coils 121 are arranged side by side at the same height. A rectangular cutout 401 is provided at the position on the X+Y side of the inner periphery of the rear coil substrate 40, that is, between the coil 121 on the X side and the coil 121 on the +Y side. Two wiring portions (not shown) are provided on the +X side of the outer periphery of the rear coil substrate 40. The two wiring portions are electrically connected to each other via the coils 121 arranged in the rear coil substrate 40.

[0041] The circuit board 41 is annular. A Hall effect IC 42 is fixed to the front surface of the circuit board 41 at a position corresponding to the notch 401 on the -X+Y side. The Hall effect IC 42 is a magnetic position sensor. Six connection points (not shown) are provided at the position where the Hall effect IC 42 is fixed on the circuit board 41. These six connection points are electrically connected to the six contacts of the Hall effect IC 42.

[0042] Two connection portions (not shown) are provided on the +X side of the outer periphery of the circuit substrate 41. Three connection portions (not shown) are provided on the +Y side and the Y side of the rear surface of the circuit substrate 41, respectively.

[0043] The base 43 is insert-molded in a state where the main body of the base 43 is made of resin and two first metal members 94 , two second metal members 95 , and two third metal members 96 are embedded in the resin.

[0044] The base 43 has an annular bottom surface. On the +X+Y, +XY, -X+Y, and XY sides of the inner periphery of the central through-hole in the base 43, pillars 431 are positioned, rising toward the +Z side. Three holes 434 are provided on each of the +Y and Y sides of the base 43. These three holes 434 are aligned in the X direction.

[0045] Each first metal member 94 includes an exposed portion 941 that is exposed in a hook-like manner in the front and rear directions in the hole 434 on the +X side; a buried portion 942 that, when buried, protrudes from the exposed portion 941 toward the +X side and extends while curving to the nearest column 431; and a rising portion 943 that rises from the column 431 and extends forward along the column 431. The front end of the rising portion 943 protrudes forward of the front edge of the column 431 and is exposed.

[0046] Each second metal component 95 has: an exposed portion 951, which is exposed in a hook shape forward and backward in the middle hole 434; an embedded portion 952, which extends from the exposed portion 951 toward the outer peripheral side when embedded; and a blade side receiving portion 953, which stands up in a step-like manner at the front end of the embedded portion 952 and then protrudes to the outside of the outer edge of the base 43.

[0047] Each third metal component 96 has: an exposed portion 961, which is exposed in a hook shape forward and backward in the hole 434 on the -X side; an embedded portion 962, which extends from the exposed portion 961 toward the outer peripheral side when embedded; and a blade side receiving portion 963, which stands up in a step-like manner at the front end of the embedded portion 962 and then protrudes to the outside of the outer edge of the base 43.

[0048] The rising portions of the blade side receiving portions 953 and 963 are covered by the laterally elongated thin plate portion 439 in the X direction, and the blade side receiving portions 953 and 963 protrude outward from the side surfaces of the thin plate portion 439 .

[0049] The blade drive device 1 is manufactured in the following manner.

[0050] The circuit board 41 is fixed to the front surface of the base 43. The exposed portions 941, 951, and 961 on the +Y side and the exposed portions 941, 951, and 961 on the -Y side of the base 43 are soldered to the three connecting portions on the +Y side and the three connecting portions on the -Y side of the circuit board 41, respectively.

[0051] The rear coil substrate 40 is fixed to the front of the circuit substrate 41. The Hall IC 42 on the circuit substrate 41 is housed in the notch 401 on the -X+Y side of the rear coil substrate 40. The two connecting portions on the +X side of the circuit substrate 41 are soldered to the two connecting portions on the +X side of the rear coil substrate 40. The rising portion 943 of the first metal member 94 of the base 43 extends through the edge of the through hole in the circuit substrate 41 to the front.

[0052] The movable ring 22 is supported in mid-air on the outer periphery of the four pillars 431 of the base 43 via four leaf springs 30. The inner plate-like portions of the leaf springs 30 are fixed to the side surfaces of the pillars 431. The outer plate-like portions of the leaf springs 30 are inserted into and fixed to the slits 223 of the movable ring 22. The front end of the rising portion 943 of the first metal member 94 of the base 43 is soldered to the connection portion 201 of the front coil substrate 20.

[0053] The front coil substrate 20 is pre-fixed to the rear surface of the disk portion 127 of the fixed plate 12. Thus, the lower edges of the inner peripheral wall portion 128 and the outer peripheral wall portion 129 of the fixed plate 12 are fixed to the inner peripheral edge and the outer peripheral edge of the base 43. The front coil substrate 20 is soldered and electrically connected to the front end of the rising portion 943 of the first metal component 94 of the base 43 through the hole 125 and the connection portion 201. Figure 6 As shown, the blade side receiving portions 953 and 963 of the base 43 are exposed to the outer peripheral side through the cutout 120 of the fixing plate 12 .

[0054] The front coil substrate 20, movable ring 22, rear coil substrate 40, and circuit substrate 41 are housed in an annular space formed between the inner circumferential wall 128 and outer circumferential wall 129 of the fixed plate 12. Within this annular space, the coils 121 on the +X, -X, +Y, and Y sides of the front coil substrate 20 and rear coil substrate 40 face each other, with the magnets 21 on the X, -X, +Y, and Y sides sandwiched between them.

[0055] The notch 401 on the -X+Y side of the rear coil substrate 40 houses the Hall IC 42. The Hall IC 42 is located at an angular position between the -X and +Y groups of the four groups formed by the magnet 21 and the front and rear coils 121. The -X+Y plate spring 30 is located in front of the Hall IC 42. The six contacts of the Hall IC 42 are electrically connected to the six terminals on the front surface of the circuit substrate 41.

[0056] like Figure 6 As shown in FIG. 1 , the movable pin 224 of the movable ring 22 passes through the long hole 124 of the fixed plate 12 and flies forward. Figure 5 As shown, the fixing pin 123 of the fixing plate 12 is inserted into the fixing hole 113 of the blade 11, and the movable pin 224 is inserted into the movable hole 114 of the blade 11. The cover 10 is fixed to the outer periphery of the disc portion 127 of the fixing plate 12.

[0057] like Figure 2 As shown, blade-side receiving portions 953 and 963 protruding from the notches 120 on the +Y and -Y sides of the blade drive device 1 are respectively placed on the front ends of the two carrier-side receiving portions 701 on the +Y and -Y sides of the lens carrier 70. The carrier-side receiving portion 701 and the blade-side receiving portions 953 and 963 are fixed and electrically connected by welding or soldering.

[0058] The Hall IC 42 connected to the carrier-side receiving portion 701 senses the magnetic field of the magnet 21 to detect the position of the magnet 21 in the rotational direction relative to the Hall IC 42, and outputs the current supplied to the coil 121 based on the result. When current is supplied to the coil 121 of the front coil substrate 20 and the rear coil substrate 40 of the blade drive device 1, the electromagnetic force generated by the coil 121 and the magnet 21 is used to generate an axial thrust around the optical axis. Using this thrust, the movable ring 22 rotates relative to the fixed plate 12. As this rotation occurs, the movable pin 224 of the movable ring 22 moves in 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.

[0059] The above are the details of this embodiment. The blade drive device 1 in this embodiment comprises: blades 11; four groups, each group comprising a magnet 21 and at least one coil 121 facing the magnet 21, with the electromagnetic force generated between the magnet 21 and the coil 121 driving the blades 11; and a Hall effect IC 42, a magnetic field position sensor that senses the magnetic field of the magnet 21 to detect the position of the magnet 21. The Hall effect IC 42 is located between two adjacent groups of the four groups. This provides a blade drive device 1 that can accommodate a magnetic position sensor even in a small space.

[0060] In addition, in the above embodiment, the Hall IC 42 may be arranged at a position where one coil 121 is originally set among all the coils 121 to replace the coil 121. Figure 11 As shown, the rear coil substrate 40 may have a cutout 402 formed at the location where the -X coil 121 of the two +Y coils 121 should be located, and a Hall IC 42 may be provided in the cutout 402. In this case, the Hall IC 42 faces the magnet 21 on the +Y side.

[0061] In the above embodiment, the coil may be fixed to the movable ring 22 and the magnet may be fixed to the fixed portion. Alternatively, one magnet 21 may be provided for each coil 121 .

[0062] Furthermore, in the above-described embodiment, the number of sets of the magnets 21 and the coils 121 may be two, three, or five or more.

[0063] Explanation of symbols:

[0064] 1. Blade drive unit; 5. Lens drive unit; 6. Image sensor; 7. Lens body; 8. Camera unit; 9. Smartphone; 10. Cover; 11. Blade; 12. Fixing plate; 20. Front coil substrate; 21. Magnet; 22. Movable ring; 30. Plate spring; 40. Rear coil substrate; 41. Circuit substrate; 42. Hall effect IC; 43. Base; 70. Lens carrier; 94. First metal component; 95. Second metal component; 96. Third metal component; 113. Fixing hole; 114. Movable hole; 120 , 401 incision; 121 coil; 123 fixing pin; 124 long hole; 125 hole; 127 disk portion; 128 inner wall portion; 129 outer wall portion; 201 wiring portion; 220 recessed portion; 222 platform portion; 223 gap; 224 movable pin; 431 column portion; 434 hole; 439 thin plate portion; 701 carrier side receiving portion; 941, 951, 961 exposed portion; 942, 952, 962 embedded portion; 943 rising portion; 953, 963 blade side receiving portion.

Claims

1. A blade driving device, characterized in that: have: blade; a plurality of groups, each group comprising a magnet and at least one coil facing the magnet, wherein the blades are driven to move by electromagnetic force generated between the magnet and the coil; and A magnetic field position sensor, which senses the strength of the magnetic field of the magnet to detect the position of the magnet, The magnetic field position sensor is located between two adjacent groups in the plurality of groups, or the magnetic field position sensor is configured to replace a position where one coil is originally set among all the coils. The coil is arranged on a front coil substrate located in front of the magnet and a rear coil substrate located in rear of the magnet. The magnetic field position sensor is arranged in a cutout provided in the rear coil substrate.

2. The blade driving device according to claim 1, characterized in that: The magnetic field position sensor is located at a position on the rear coil substrate where one coil is originally set, and faces the magnet.

3. The blade driving device according to claim 1, characterized in that: have: Fixed part; a movable ring that utilizes the thrust generated by the electromagnetic force around the optical axis to rotate relative to the fixed portion to move the blades; and a plurality of leaf springs supporting the movable ring, The magnetic field position sensor is located between the two adjacent groups. One of the plurality of leaf springs is located on a front side of the magnetic field position sensor.

4. A camera device, characterized in that A blade drive device according to any one of claims 1 to 3 is provided.

5. An electronic device, characterized in that: A camera device according to claim 4 is provided.

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