CN214896143U - Blade drive device, camera device, and electronic apparatus - Google Patents

Abstract

The utility model provides a blade drive arrangement that space efficiency that electromagnetic force produced is high. A blade drive device (1) defines a central axis O and is provided with: a plurality of blades (11) disposed around the central axis O; and a plurality of groups, each group having a magnet (31) and at least two coils (410), and being arranged at intervals along the circumference of a circle having a center axis O, wherein the winding axial direction of the coils (410) and the normal direction of the facing surface of the magnet (31) facing the coils (410) are directed in the direction of the center axis O, and when viewed in the radial direction of the circle, the magnetic poles formed on the facing surface are reversed at positions corresponding to the centers of the coils (410), and each group generates an electromagnetic force along the circumferential direction of the circle to drive the blades (11). The utility model also provides a camera device and electronic equipment.

Description

Blade drive device, camera device, and electronic apparatus

Technical Field

The utility model relates to a used blade drive arrangement of electronic equipment such as smart mobile phone, camera device and electronic equipment.

Background

Various techniques for adjusting the amount of light of a lens body by sliding a blade of a camera device have been proposed. In the camera module disclosed in patent document 1, three blades are arranged around the entrance hole, and the amount of light entering the lens body is changed by driving the three blades. In the camera module, three drive coils are disposed on an fpc (flexible printed wiring lenses) on a bottom surface of a housing for holding the blade, three drive magnets are disposed on a movable ring facing the housing, and the movable ring is rotated around an optical axis by electromagnetic force generated by the drive coils and the drive magnets to move the blade. The aperture mechanism device disclosed in patent document 2 has two substantially L-shaped blades called "blades" arranged around an entrance hole, and changes the amount of light entering a lens body by driving the two blades. The diaphragm mechanism device has three coils arranged on the FPC on the bottom surface of a base, three permanent magnets arranged on a rotating ring on the upper side of the base, and a blade driven by rotating the rotating ring around an optical axis by electromagnetic force generated by the coils and the permanent magnets.

Documents of the prior art

Patent document

Patent document 1, chinese 110858048A publication

Patent document 2 korean patent publication No. 2018-

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, the techniques described in patent documents 1 and 2 have a structure in which a plurality of groups including one coil and a magnet magnetized so as to have two different magnetic poles on a surface facing the coil are arranged around the incident hole, and there is a problem that space efficiency of electromagnetic force generation is low.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a blade driving device with high space efficiency in which electromagnetic force is generated.

Means for solving the problems

In order to solve the above problem, a blade drive device according to a preferred embodiment of the present invention is a blade drive device that defines a center axis, and includes: a plurality of blades arranged around the central axis; and a plurality of groups each including a magnet and at least two coils, the groups being arranged at intervals along a circumference of a circle having the center axis as a center, a winding axial direction of the coils and a normal direction of an opposing surface of the magnet opposing the coils being directed in a direction of the center axis, a magnetic pole formed on the opposing surface being inverted at a position corresponding to a center of each of the coils when viewed in a radial direction of the circle, each of the groups generating an electromagnetic force along the circumferential direction of the circle to drive the blade.

In this aspect, the magnet may be sandwiched between at least two coils provided on a front side in the center axis direction and at least two coils provided on a rear side in the center axis direction in each of the groups.

The coils may be connected and arranged side by side along the circumferential direction of the circle when viewed from the central axis.

In addition, two or more of the coils may be linearly connected and arranged in parallel when viewed from the center axis direction.

In addition, in the direction in which the coils are arranged, an area of a portion in which one of the magnetic poles located at both ends of the magnet is magnetized may be smaller than an area of a portion in which one of the magnetic poles located at other than both ends of the magnet is magnetized.

In addition, in the direction in which the coils are arranged, an end portion of the magnet may be located at a position corresponding to a center of the coil.

The magnetic field generator may further include a stationary portion and a movable ring supported to be rotatable about the central axis with respect to the stationary portion, the blades being driven by the rotation of the movable ring, and one of the coil and the magnet may be disposed on the stationary portion, and the other may be disposed on the movable ring.

In another preferred aspect of the present invention, the camera device includes the blade driving device.

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

Effect of the utility model

The utility model discloses a blade drive device defines the center pin, possesses: a plurality of blades arranged around the central axis; and a plurality of groups including magnets and at least two coils disposed at intervals along a circumference of a circle having a center along the center axis, wherein a winding axial direction of the coils and a normal direction of an opposing surface of the magnets opposing the coils are oriented in a direction of the center axis, and when viewed from a radial direction of the circle, magnetic poles formed on the opposing surface are reversed at positions corresponding to centers of the coils, and each of the groups generates an electromagnetic force along the circumferential direction of the circle to drive the blade. At least two coils are provided in each of the plurality of groups. Thus, the blade driving device with high space efficiency generated by electromagnetic force can be provided.

Drawings

Fig. 1 is a front view of a smartphone 9 on which a camera device 8 including a blade drive device 1 according to an embodiment of the present invention is mounted.

Fig. 2 is a perspective view of the blade drive device 1 and the lens drive device 5 of fig. 1.

Fig. 3 is a perspective view of the blade drive device 1 of fig. 2.

Fig. 4 is an exploded perspective view of the blade drive device 1 of fig. 3.

Fig. 5 is a view of fig. 3 with the cover 10, the blade 11, and the fixing plate 12 removed.

Fig. 6 is a view of fig. 5 with the front coil substrate 20 removed.

Fig. 7 is a view of fig. 6 with the magnet pieces 311 and 312 removed.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, a camera device 8 including a blade drive device 1 according to an embodiment of the present invention is housed in a smartphone 9.

The camera device 8 has: 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 for driving the lens body 7; and a blade driving device 1 for driving the blade 11 disposed on the front side of the lens body 7.

Hereinafter, a direction in which light from an object enters is appropriately referred to as a Z direction, one direction orthogonal to the Z direction is appropriately referred to as an X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as a Y direction. The + Z side, which is the side of the object on the optical axis of the lens body 15, may be referred to as the front side, and the Z side, which is the side opposite to the object on which the image sensor 16 is provided, may be referred to as the rear side.

As shown in fig. 2, the lens driving device 5 has a lens carrier 70 inside thereof, and the lens carrier 70 holds the lens body 7. Metal receiving portions 74 and 75 are provided on the + Y side and the-Y side of the front surface of the lens carrier 70. The receiving portions 74 and 75 extend toward the + Z side. The lens driving device 5 supports metal members 94 and 95 protruding toward the-Y side and the + Y side of the blade driving device 1 by the receiving portions 74 and 75, and supplies power to the blade driving device 1 through the receiving portions 74 and 75 and the metal members 94 and 95. The blade drive device 1 is configured such that the optical axis of the lens body 7 is the central axis O of the blade drive device 1 and is attached to the lens carrier 70. The central axis O is a shaft that passes through the center of the blade drive device 1 in the Z direction, and the central axis direction is the same as the Z direction. In addition, the center axis direction is also the front-rear direction.

As shown in fig. 4, the blade drive device 1 includes a cover 10, four blades 11, a fixed plate 12, a front side coil substrate 20, a movable ring 21, four plate springs 30, four magnets 31, a rear side coil substrate 40, a circuit substrate 41, and a base 42. The cover 10, the fixed plate 12, the front coil substrate 20, the rear coil substrate 40, the circuit substrate 41, and the base 42 constitute a fixed portion that is not movable with respect to the lens carrier 70.

The cover 10 has an annular plate shape centered on the central axis O. The vanes 11 are flat plates, and four vanes 11 of the same shape are arranged at intervals of 90 degrees. A fixed hole 113 and a movable hole 114 are provided in a projection portion projecting from the outer edge of the blade 11. The fixing hole 113 is circular. The movable hole 114 extends in a direction intermediate the radial direction and the tangential direction of the circumference. Openings are formed on the inner peripheral sides of the four blades 11, and the blades 11 are rotated about the fixing holes 113 to control the size of the openings, thereby controlling the amount of light entering the image sensor 6 from the subject through the lens body 7.

The fixed plate 12 has a front wall 127, an inner peripheral wall 128, and an outer peripheral wall 129. The front side wall 127 has fixing pins 123 and elongated holes 124 at positions near the outer peripheral edges of the + X side, -X side, + Y side, and-Y side, respectively. The fixing pin 123 and the long hole 124 are disposed close to each other in the tangential direction of the circle, and the long hole 124 extends in the tangential direction of the circle. Further, holes 120 are provided on the inner peripheral edges of the front side wall portion 127 on the + X side and the-X side, respectively. The inner peripheral wall 128 and the outer peripheral wall 129 extend from the inner peripheral edge and the outer peripheral edge of the front wall 127 toward the-Z side, and the fixed plate 12 is formed into an annular shape centered on the center axis O as viewed from the center axis direction.

The front coil substrate 20 has an annular plate shape centered on the central axis O. Notches 202 are provided at positions on the + X side, -X side, + Y side, and-Y side of the outer periphery of the front coil substrate 20.

3 coils 410 are embedded in the front coil substrate 20 on the + X + Y side, the + X-Y side, the-X + Y side, and the-X-Y side, respectively. The 3 coils 410 are adjacent to each other along the circumferential direction. Each coil 410 is formed around a winding shaft in the center axial direction, and has a linear portion in a substantially radial direction.

The wiring portions 203 are provided at positions on the + X side and the-X side of the inner periphery of the front side coil substrate 20. The hole 120 of the fixing plate 12 is provided at a position corresponding to the wire connection portion 203. Current flows from one of the wire connection portions 203 to the other wire connection portion 203 through each of the coils 410 disposed in the front side coil substrate 20.

The movable ring 21 has a ring shape with front and rear panels. On the outer peripheral edges of the + X side, -X side, + Y side, and-Y side of the front surface of the movable ring 21, land portions 212 are provided, respectively, so as to protrude forward, and a movable pin 214 protruding forward is provided on each land portion 212. Slits 218 are provided along the front-rear direction on the + X, -X side, + Y side, and-Y side of the inner peripheral wall of the movable ring 21, toward the radially outer side of the movable ring 21. Protrusions 219 protruding inward are provided on both sides of the slit 218.

The plate spring 30 has an inner edge portion 32, an outer edge portion 33, and a wrist portion 34 elastically connecting these. The wrist portion 34 is formed by a linear bending elastic member.

The magnet 31 is formed by bonding four magnet pieces 311 and 312 in an arc shape. The circumferential width of the two magnet pieces 312 at both ends of the magnet 31 is equal to or more than half the circumferential width of the two magnet pieces 311 at the center. The magnet pieces 311 and 312 of the magnet 31 are magnetized in the front-rear direction, and the magnetic poles of the adjacent magnet pieces 311 and 312 in the plate surface direction (front-rear direction, i.e., central axial direction) are opposite magnetic poles. Therefore, the area of the magnetized portion of one magnetic pole located at both ends of the magnet 31 is smaller than the area of the magnetized portion of one magnetic pole located outside both ends of the magnet 31.

The rear coil substrate 40 has an annular plate shape centered on the central axis O. Notches 402 are provided at positions on the + X side, -X side, + Y side, and-Y side of the outer periphery of the rear coil substrate 40.

3 coils 410 are embedded in the + X + Y side, + X-Y side, -X + Y side, and-X-Y side of the rear coil substrate 40, respectively. The 3 coils 410 are adjacent to each other in the circumferential direction and arranged side by side. Each coil 410 is formed around a winding shaft in the center axial direction, and has a linear portion in the substantially radial direction.

Two wiring portions, not shown, are provided on the rear surface of the rear coil substrate 40 at positions on the outer periphery of the + X side. Current flows from one terminal portion to the other terminal portion through each of the coils 410 disposed in the rear coil substrate 40.

The circuit board 41 is an annular plate having a circular inner side and a rectangular outer side. Three wiring portions (not shown) are provided on the + Y side and the Y side of the rear surface of the circuit board 41 so as to correspond to the holes 424, respectively. Two wire connecting portions (not shown) are provided at the outer peripheral position on the + X side of the rear surface. A hall IC, not shown, is provided on the front surface of the circuit board 41.

The base 42 is formed by insert molding, the body of the base 42 is made of resin, and two 1 st metal members 94, two 2 nd metal members 95, and two 3 rd metal members 96 are embedded in the resin.

The base 42 has an annular bottom plate 420. On the + X side, -Y side and + Y side of the inner peripheral edge of the bottom plate 420, column portions 421 rising to the + Z side are provided. On the + Y side and the-Y side of the base 42, 3 holes 424 are provided, respectively. Three holes 424 are side by side along the X direction.

Each 1 st metal member 94 extends between the hole 424 on the right side and the outer edge of the bottom plate 420 as viewed from the outer peripheral side. One end of each 1 st metal member 94 is exposed to the front and rear in the + X-side hole 424. The other end of each 1 st metal member 94 protrudes outside the bottom plate 420 after rising in a step-like manner at the outer edge of the bottom plate 420.

Each metal 2 member 95 extends between the very middle hole 424 and the outer edge of the bottom plate 420. One end of each metal member 2 95 is exposed forward and backward through a hole 424 in the middle. The other end of each 2 nd metal member 95 rises in a step shape at the outer edge of the bottom plate 420 and protrudes outward from the bottom plate 420.

Each 3 rd metal member 96 extends between the hole 424 on the left side and the column 421 on the + X side or the X side, as viewed from the outer peripheral side. One end of each 3 rd metal member 96 is exposed to the front and rear in the hole 424 on the left side as viewed from the outer peripheral side. The other end of each 3 rd metal member 96 stands on the pillar portion 421 and extends to the front side along the pillar portion 421. The front end of the rising portion of each 3 rd metal member 96 protrudes to be exposed to the front of the front edge of the pillar portion 421.

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

First, the rear coil substrate 40 is fixed to the front surface of the circuit substrate 41. The rear-side solder bonds the two wiring portions located on the rear surface of the rear-side coil substrate 40 and the two wiring portions located on the + X-side outer periphery of the rear surface of the circuit substrate 41. Thus, the output portion of the hall IC, not shown, provided on the circuit board 41 is electrically connected to the rear coil board 40.

Next, the circuit board 41 is fixed to the front surface of the bottom plate 420 of the base 42. The 1 st metal member 94, the 2 nd metal member 95, and the 3 rd metal member 96 are solder-bonded to the wiring portions on the rear side of the circuit board 41 through the holes 424 of the base 42, respectively. Thus, the hall IC, not shown, provided on the circuit board 41 is electrically connected to the outside of the blade drive device 1 via the 1 st metal member 94 and the 2 nd metal member 95, and the output portion of the hall IC is also electrically connected to the 3 rd metal member 96. Further, the notches 402 provided on the + Y side and the-Y side make it possible to increase the radial dimension of the coil 410 without interfering with the 1 st metal member 94 and the 2 nd metal member 95 in the rear side coil substrate 41.

In another method, the magnet 31 is fitted between two protrusions 219 located between adjacent slits 218 of the movable ring 21, and the movable ring 21 and the magnet 31 are fixed. The outer edge 33 of the plate spring 30 is inserted into and fixed to the slit 218. The movable ring 21 in which the magnet 31 is incorporated is disposed on the base 42, and the inner edge portion 32 of the plate spring 30 is fixed to the column portion 421 of the base 42. At this time, the movable ring 21 is supported by the plate spring 30 in a floating state with respect to the base 42.

The front coil substrate 20 is fixed to the rear surface of the front side wall portion 127 of the fixed plate 12 in advance. At this time, the wiring portion 203 of the front side coil substrate 20 is exposed from the hole 120 of the fixed plate 12. Accordingly, the movable pin 214 is fitted into the elongated hole 124 to fix the rear edges of the inner peripheral wall 128 and the outer peripheral wall 129 of the fixed plate 12 to the inner peripheral edge and the outer peripheral edge of the bottom plate 420 of the base 42. By the slits 202, the front coil substrate 20 can increase the size of the coil 410 in the radial direction without interfering with the movable pins 214. The front coil substrate 20 is electrically connected to the terminal portion 203 at the tip of the 3 rd metal member 96 of the base 42 by soldering via the hole 120. Thus, the front side coil substrate 20 is electrically connected to an output portion of a hall IC, not shown, provided on the circuit substrate 41.

Next, the vanes 11 are mounted on the fixing plate 12. At this time, the fixing pins 123 of the fixing plate 12 are fitted into the fixing holes 113 of the blades 11, and the moving pins 214 of the moving ring 21 penetrating the long holes 124 of the fixing plate 12 are fitted into the moving holes 114 of the blades 11. Finally, the cap 10 is mounted on the fixing plate 12.

After the blade driving device 1 is completed, the receiving portions 74 and 75 of the lens driving device 5 are joined by welding or soldering to the rear surfaces of the 1 st metal member 94 and the 2 nd metal member 95 exposed to the outside of the base 42.

The three coils 410 of the front coil substrate 20 and the three coils 410 of the rear coil substrate 40 are opposed to each other with the magnet 31 interposed therebetween on the + X side, -X side, + Y side, and-Y side. That is, both plate surfaces of the plate-shaped magnet 31 are facing surfaces facing the coil 410, and magnetic poles are formed on the facing surfaces. In the parallel direction of the magnet pieces 311 and 312 in each magnet 31, the magnetic poles formed on the facing surfaces are reversed at positions corresponding to the centers of the coils 410 when viewed from the radial direction of the circle. Therefore, the linear portions extending in the radial direction of the coils 410 face the facing surfaces of the magnets 31 on which the magnetic poles are formed.

When current is supplied to the coils 410 of the front side coil substrate 20 and the rear side coil substrate 40 of the blade drive device 1, electromagnetic force is generated in the circumferential tangential direction by the coils 410 and the magnets 31, and an axial thrust is generated around the central axis O. The movable ring 21 rotates relative to the fixed plate 12 by the thrust force. 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 fitted in the fixed hole 113.

The above is the details of the present embodiment. The blade drive device 1 of the present embodiment defines a central axis O, and includes: a plurality of blades 11 disposed around the central axis O; and a plurality of groups each having the magnet 31 and at least two coils 410, the groups being arranged with a gap therebetween along the circumference of a circle having the center axis O as the center, the winding axial direction of the coils 410 and the normal direction of the facing surface of the magnet 31 facing the coils 410 being oriented toward the center axial direction, the magnetic poles formed on the facing surface being reversed at positions corresponding to the centers of the coils 410 when viewed from the radial direction of the circle, each group generating electromagnetic force along the circumference of the circle to drive the blade 11. Each of the groups has at least two coils 410. This makes it possible to provide the blade drive device 1 that generates electromagnetic force and uses space efficiently.

In the above embodiment, the magnets 31 may be two magnetic pole pieces 312 in one group, and may face the coils 410 arranged one by one on the front side and the rear side. The magnet 31 may be one magnetic pole piece 311 and may face 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 end portions of the magnets 31 are positioned at the minimum combination at positions corresponding to the centers of the coils 410 at both ends. In addition, more than 3 coils 410 may be used in a group. 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. The number of the magnet 41 and the coil 40 may be 2, 3, or 5 or more.

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

In the above embodiment, the coil 410 may be fixed to the movable ring 3, and the magnet 31 may be fixed to the fixing portion.

In the above embodiment, the magnets 31 and the coils 410 in each group may be linearly connected and arranged side by side. In addition, the magnet 31 may be configured such that the magnetization direction is reversed without using the individual magnet pieces 311 and 312.

Description of the symbols:

1 a blade driving device; 3, a movable ring; 5 a lens driving device; 6 an image sensor; 7 a lens body; 8a camera device; 9 a smart phone; 10, covering; 11 blades; 12 fixing the plate; 20 a front side coil substrate; 21 a movable ring; 30 plate-shaped springs; 31 a magnet; 32 an inner edge portion; 33 an outer edge portion; 34 a wrist part; 40 a rear side coil substrate; 41 a circuit board; 42 a base; 70a lens carrier; 7475 receiving part; 94, 1 st metal part; 95 a 2 nd metal part; 96, a 3 rd metal part; 113 a fixing hole; 114 a movable aperture; 120 holes; 123 fixed pins; 124 long holes; 127 a front side wall portion; 128 inner peripheral wall portion; 129 outer peripheral wall portions; 202. 402, cutting; 203. 403 a wiring portion; 212 a table section; 214 a movable pin; 218 gap; 219 a convex part; 311. 312 magnet pieces; 410 a coil; 420 a base plate; 421 column parts; 424 holes.

Claims (9)

1. A vane drive device is characterized in that,

defines a central axis, and includes:

a plurality of blades arranged around the central shaft; and

a plurality of groups each having a magnet and at least two coils, the plurality of groups being arranged at intervals along a circumference of a circle having the center axis as a center,

a winding axial direction of the coil and a normal direction of an opposing surface of the magnet opposing the coil are directed in a direction of the central axis,

the magnetic poles formed on the facing surfaces are reversed at positions corresponding to the centers of the coils when viewed from the radial direction of the circle,

each of the groups generates an electromagnetic force along a circumferential direction of the circle to drive the blades.

2. Blade driving device according to claim 1,

in each of the groups, the magnet is sandwiched between at least two of the coils provided on a front side in the central axis direction and at least two of the coils provided on a rear side in the central axis direction.

3. Blade driving device according to claim 1 or 2,

the coils are connected and side-by-side along the circumferential direction of the circle when viewed axially from the center.

4. Blade driving device according to claim 1 or 2,

the coils are linearly connected and arranged side by side when viewed from the central axis.

5. Blade driving device according to claim 1 or 2,

in the parallel direction of the coils, an area of a portion where one magnetic pole located at both ends of the magnet is magnetized is smaller than an area of a portion where one magnetic pole located at a portion other than both ends of the magnet is magnetized.

6. Blade driving device according to claim 1 or 2,

in the parallel direction of the coils, the end of the magnet is located at a position corresponding to the center of the coil.

7. Blade driving device according to claim 1,

comprises a fixed part and a movable ring

The movable ring is supported to be rotatable about the central axis with respect to the fixed portion, and the blades are driven by the rotation,

one of the coil and the magnet is disposed on the fixed portion, and the other is disposed on the movable ring.

8. A camera device comprising the blade driving device according to any one of claims 1 to 7.

9. An electronic device comprising the camera device according to claim 8.

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