CN115509067A

CN115509067A - Blade drive device, camera device, and electronic apparatus

Info

Publication number: CN115509067A
Application number: CN202110701510.1A
Authority: CN
Inventors: 傅雪鹏; 矢野智义
Original assignee: New Shicoh Motor Co Ltd
Current assignee: New Shicoh Motor Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-12-23

Abstract

The invention provides a blade driving device capable of arranging a position sensor in a small space. A blade drive device (1) is provided with: a blade (11); four groups, each group is provided with a magnet (21) and at least one coil (121) opposite to the magnet (21), and the blades (11) are pushed to move through electromagnetic force generated between the magnet (21) and the coil (121); and a Hall IC (42) which is a magnetic position sensor and senses the strength of the magnetic field of the magnet (21) to detect the position of the magnet (21), wherein the Hall IC (42) is positioned between two adjacent groups of the four groups. The invention also provides a camera device and an electronic device.

Description

Blade drive device, camera device, and electronic apparatus

Technical Field

The present invention relates to a blade driving device, a camera device, and an electronic apparatus for use in an electronic apparatus such as a smartphone.

Background

Various techniques have been proposed for adjusting the amount of light entering a lens body by sliding a blade of a camera device. The camera module disclosed in patent document 1 is used by being mounted on an automobile, a building, a mobile communication terminal, a smartphone, a tablet computer, or the like. In this camera module, three drive coils are arranged in a housing that holds the blades, and three drive magnets are arranged in a movable ring that faces the housing. The camera module is provided with a pair of position sensors on both sides of one of three drive coils, detects the position of the drive coil from the output signals of the position sensors, and rotates the movable member around the optical axis to move the blade.

Documents of the prior art

Patent document

Patent document 1, chinese 110858048a published patent application

Disclosure of Invention

Problems to be solved by the invention

However, in a small-sized device such as a smartphone, there is a problem that the size is strictly restricted, and it is difficult to dispose a position sensor around a driving coil.

The present invention has been made in view of the above problems, and an object thereof is to provide a blade driving device in which a position sensor can be disposed in a small space.

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 includes: a blade; a plurality of groups including magnets and at least one coil facing the magnets, the groups generating thrust for moving the blades by electromagnetic force between the magnets and the coil; and a magnetic field position sensor that detects a position of the magnet by sensing a magnetic field of the magnet, wherein the magnetic field position sensor is located at a position between two adjacent groups of the plurality of groups, or a position where a predetermined one of all the coils is certainly present.

In this aspect, the coil may be disposed on a front side coil substrate located on a front side of the magnet and a rear side coil substrate located on a rear side of the magnet, and the magnetic field position sensor may be disposed in a notch provided in the rear side coil substrate.

The coil may be disposed on a front side coil substrate located on a front side of the magnet and a rear side coil substrate located on a rear side of the magnet, and the magnetic field position sensor may be located at a position where the predetermined one coil is surely present in the rear side coil substrate and may face the magnet.

Further, the present invention may include: a fixed part; a movable ring that rotates relative to the fixed portion by the thrust force to move the blades; and a plurality of plate springs supporting the movable ring, the magnetic field position sensor being located at a position between the adjacent two sets of plate springs, one of the plurality of plate springs being located at a front side of the magnetic field position sensor.

A camera device according to another preferred embodiment of the present invention includes the blade driving device.

An electronic device according to another preferred embodiment of the present invention includes the camera device.

Effective fruit of the invention

The blade drive device of the present invention includes: a blade; a plurality of groups each having a magnet and at least one coil facing the magnet, and serving as thrust for moving the blades by electromagnetic force generated between the magnet and the coil; and a magnetic field position sensor that detects a position of the magnet by sensing a magnetic field of the magnet, wherein the magnetic field position sensor is located at a position between two adjacent coil groups of the plurality of coil groups or at a position where a predetermined one of the coils is certainly present. Thus, the blade driving device in which the position sensor can be disposed even in a small space can be provided.

Drawings

Fig. 1 is a front view of a smartphone 9 equipped with a camera device 8 including a blade drive device 1 and a lens drive device 5 according to an embodiment of the present invention.

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 removed.

Fig. 6 is a view of fig. 5 with the blade 11 removed.

Fig. 7 is a view of fig. 6 with the fixing plate 12 removed.

Fig. 8 is a view of fig. 7 with the front coil substrate 20 removed.

Fig. 9 is a view after the movable ring 22 is removed from fig. 8.

Fig. 10 is a view showing the base 43 of fig. 9.

Fig. 11 is a diagram showing a rear coil substrate 40, a hall IC42, and a base 43 of a blade drive device 1 according to another embodiment of the present invention.

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 apparatus 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 of the optical axis of the lens body 7, which is the side of the object, is sometimes referred to as the front side, and the-Z side, which is the side opposite to the object and provided on the image sensor 6, is sometimes referred to as the rear side. In addition, the + X side is sometimes referred to as the upper side, the-X side as the lower side, the + Y side as the left side, and the-Y side as the right side.

As shown in fig. 2, the lens driving device 5 has a lens carrier 70 in its interior, and the lens carrier 70 holds the lens body 7. On the + Y side and the-Y side of the front surface of the lens carrier 70, a metal carrier-side receiving portion 701 is provided which supports the blade driving device 1 and supplies power to the blade driving device 1. The blade drive device 1 is provided with

blade side receivers

953 and 963, respectively. The blade drive device 1 is configured such that the optical axis of the lens body 7 is the center of the blade drive device 1. The blade drive device 1 does not contact the lens body 7 so as to be supported by the carrier-side receiving portion 701 and the blade-side receiving

portions

953 and 963. The lens carrier 70 is supported so as to be movable 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.

As shown in fig. 4, 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 plate springs 30, a rear coil substrate 40, a circuit substrate 41, a hall IC42, and a base 43. The cover 10, the fixed plate 12, the front coil substrate 20, the rear coil substrate 40, the circuit substrate 41, the hall IC42, and the base 43 constitute a fixed portion that does not move relative to the lens carrier 70.

The cover 10 is annular. The blades 11 are flat plates, and four blades 11 are circularly arranged. A fixed hole 113 and a movable hole 114 are provided in a portion of the outer edge of the blade 11 that protrudes in a substantially rectangular shape. The fixing hole 113 is formed in a circular shape. The movable hole 114 has a shape such that a perfect circle is drawn up in a diameter direction thereof. An opening is formed on the inner peripheral side of the four blades 11, and the size of the opening is controlled by rotating the blades 11 about the fixing hole 113, thereby controlling the amount of light reaching the image sensor 6 from the subject through the lens body 7.

The fixed plate 12 includes a disc portion 127, an inner peripheral wall portion 128, and an outer peripheral wall portion 129. The disk portion 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 provided close to the tangential direction of the circle, and the long hole 124 extends along the tangential direction of the circle. Further, holes 125 are provided in the inner peripheral edges of the disk portion 127 on the + X + Y side and the + X-Y side, respectively. Inner circumferential wall 128 and outer circumferential wall 129 extend from the inner circumferential edge and outer circumferential edge of disk 127 to the-Z side. On the + Y side and the-Y side of the rear end of the outer peripheral wall portion 129, notches 120 are provided.

The front coil substrate 20 is annular. Two coils 121 are embedded in the center of the front coil substrate 20 on the + X side, the-X side, the + Y side, and the Y side of the through hole, respectively. The two coils 121 disposed on the + X side and the X side have linear portions that are aligned in the Y direction and extend in the Y direction. The two coils 121 disposed on the + Y side and the Y side have straight portions that are aligned in the X direction and extend in the X direction. The eight coils 121 are arranged side by side at the same height. At positions on the + X + Y side and the + X-Y side in the inner peripheral edge of the front side coil substrate 20, wire connection portions 201 are provided. The two wire connection portions 201 are electrically connected to each other through the respective coils 121 disposed in the front side coil substrate 20.

The movable ring 22 is annular. There are recesses 220 recessed toward the outer peripheral side on the + X side, -X side, + Y side, and Y side of the inner peripheral wall of the movable ring 22. The magnets 21 are housed and fixed in the recesses 220 on the + X side, the-X side, the + Y side, and the Y side, respectively. The magnets 21 are magnetized so as to form opposite magnetic poles along the front-rear direction in the inner circumferential half and the outer circumferential half.

On the outer peripheral edge of the front surface of the movable ring 22 on the + X side, the-X side, the + Y side, and the Y side, there are table portions 222 that protrude forward, and on each table portion 222, a movable pin 224 that protrudes forward is further provided. Slits 223 are provided on the + X + Y side, the + X-Y side, the-X + Y side, and the X-Y side of the inner peripheral wall of the movable ring 22, that is, between the concave portions 220 and the concave portions 220. The slit 223 is recessed outward in the radial direction of the movable ring 22.

The plate spring 30 includes two plate portions and a wrist portion elastically connected to the two plate portions. The wrist portion is formed of a linear bending elastic member.

The rear coil substrate 40 has a ring shape. Two coils 121 are embedded in the through-hole at the center of the rear coil substrate 40 on the + X side, the-X side, the + Y side, and the Y side, respectively. The two coils 121 disposed on the + X side and the X side have linear portions arranged in the Y direction and extending in the Y direction, respectively. The two coils 121 disposed on the + Y side and the Y side have straight portions arranged in parallel in the X direction and extending in the X direction. The eight coils 121 are side by side at the same height. A rectangular notch 401 is provided at a position on the X + Y side, that is, at a position between the X-side coil 121 and the + Y-side coil 121 on the inner peripheral edge of the rear coil substrate 40. Two wire connection portions (not shown) are provided on the + X side of the outer peripheral edge of the rear coil substrate 40. The two wire connection portions are electrically connected to each other through the respective coils 121 disposed in the rear side coil substrate 40.

The circuit board 41 has a ring shape. The hall IC42 is fixed to a position corresponding to the notch 401 on the-X + Y side in the front surface of the circuit board 41. The hall IC42 is a magnetic position sensor. Six wiring portions (not shown) are provided at positions where the hall ICs 42 are fixed on the circuit board 41. The six wiring portions are electrically connected to six contacts of the hall IC42.

Two wire connection portions (not shown) are provided on the + X side of the outer peripheral edge of the circuit board 41. Three wiring portions (not shown) are provided on the + Y side and the Y side of the rear surface of the circuit board 41, respectively.

The base 43 is formed by insert molding the body of the base 43 with two 1 st metal members 94, two 2 nd metal members 95, and two 3 rd metal members 96 embedded in the resin.

The base 43 has an annular bottom surface. In the base 43, there is a pillar portion 431 rising toward the + Z side, surrounding the + X + Y side, the + X-Y side, the-X + Y side, and the X-Y side of the inner peripheral edge of the through hole at the center. On the + Y side and the Y side of the base 43, three holes 434 are provided, respectively. Three holes 434 are side by side in the X direction.

Each 1 st metal member 94 has: an exposed portion 941 exposed in a hook shape in the front-rear direction from the hole 434 on the + X side; an embedded portion 942 that protrudes from the exposed portion 941 to the + X side in an embedded state and extends to the nearest column portion 431 while being bent; and a rising portion 943 rising up from the column portion 431 and extending to the front side along the column portion 431. The front end of the standing portion 943 protrudes to the front of the front edge of the column portion 431 and is exposed.

Each of the 2 nd metal members 95 has: an exposure portion 951 in which the hole 434 in the center is exposed in a hook shape in the front-rear direction; an embedded portion 952 extending from the exposed portion 951 to the outer circumferential side in an embedded state; and a blade-side receptor 953 rising in a stepped manner at the tip of the embedded portion 952 and then protruding outward from the outer edge of the base 43.

Each 3 rd metal member 96 has: an exposed portion 961, which is exposed in a hook shape in the front-rear direction at the hole 434 on the-X side; an embedded portion 962 extending from the exposed portion 961 to the outer peripheral side in an embedded state; and a blade side receptor 963 that steps up at the front end of the buried portion 962 before protruding to the outside of the outer edge of the die 43.

The rising portions of the

blade side receptors

953 and 963 are covered with a laterally long thin plate portion 439 in the X direction, and the

blade side receptors

953 and 963 protrude outward from the side surface of the thin plate portion 439.

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

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 solder-bonded to the three wire connection portions on the + Y side and the three wire connection portions on the-Y side of the circuit board 41, respectively.

The rear coil substrate 40 is fixed to the front surface of the circuit substrate 41. The hall ICs 42 on the circuit substrate 41 are housed in the cutouts 401 on the-X + Y side of the rear side coil substrate 40. The two connection portions on the + X side of the circuit board 41 are solder-bonded to the two connection portions on the + X side of the rear coil board 40. The rising portion 943 of the 1 st metal member 94 of the base 43 penetrates the edge of the through hole of the circuit board 41 and extends to the front side.

The movable ring 22 is supported in the air via four plate springs 30 on the outer peripheral side of the four column portions 431 of the base 43. The inner peripheral plate-like portion of the plate-like spring 30 is fixed to the side surface of the column portion 431. The outer peripheral plate portion of the plate spring 30 is inserted into the slit 223 of the movable ring 22 and fixed. The front end portion of the standing portion 943 of the 1 st metal member 94 of the base 43 is solder-bonded to the wire connection portion 201 of the front side coil substrate 20.

The front coil substrate 20 is fixed to the rear surface of the disk portion 127 of the fixed plate 12 in advance. Accordingly, the lower edges of the inner peripheral wall 128 and the outer peripheral wall 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 electrically connected to the wiring portion 201 by solder bonding to the front end portion of the standing portion 943 of the 1 st metal member 94 of the base 43 through the hole 125. As shown in fig. 6, the blade-

side receivers

953 and 963 of the base 43 are exposed to the outer peripheral side thereof through the notch 120 of the fixed plate 12.

The front coil board 20, the movable ring 22, the rear coil board 40, and the circuit board 41 are housed in an annular space formed between the inner peripheral wall 128 and the outer peripheral wall 129 of the stationary plate 12. In the annular space, the coils 121 on the + X side, -X side, + Y side, and Y side of the front coil substrate 20 and the rear coil substrate 40 are opposed to each other with the magnets 21 on the X side, -X side, + Y side, and Y side interposed therebetween.

The hall IC42 is housed in the notch 401 on the-X + Y side of the rear coil substrate 40. The hall ICs 42 are located at angular positions between the-X side group and the + Y side group among the four groups formed by the magnets 21 and the front and rear coils 121. On the front side of the hall IC42, there is a plate spring 30 on the-X + Y side. Six contacts of the hall IC42 are electrically connected to six wiring portions on the front surface of the circuit substrate 41.

As shown in fig. 6, the movable pin 224 of the movable ring 22 is projected forward through the long hole 124 of the stationary plate 12. Accordingly, as shown in fig. 5, the fixing pins 123 of the fixing plate 12 are fitted into the fixing holes 113 of the blades 11, and the movable pins 224 are fitted into the movable holes 114 of the blades 11. The cover 10 is fixed to the outer periphery of the disk portion 127 of the fixed plate 12.

As shown in fig. 2,

blade side receivers

953 and 963 protruding from the notches 120 on the + Y side and the-Y side of the blade drive device 1 are placed on the tip end portions of the two carrier side receivers 701 on the + Y side and the-Y side of the lens carrier 70, respectively. Carrier-side receiver 701 and blade-

side receivers

953 and 963 are fixed by welding or solder bonding and electrically connected.

The hall IC42 connected to the carrier-side receiving portion 701 senses the magnetic field of the magnet 21, detects the position of the magnet 21 with respect to the rotation direction of the hall IC42, and outputs the current supplied to the coil 121 based on the result. When current is supplied to the coils 121 of the front side coil substrate 20 and the rear side coil substrate 40 of the blade drive device 1, a thrust force in the axial direction around the optical axis is generated by the electromagnetic force generated by the coils 121 and the magnets 21. By this thrust, the movable ring 22 rotates relative to the fixed plate 12. With this rotation, the movable pins 224 of the movable ring 22 move in the movable holes 114 of the blades 11, and the blades 11 rotate around the shafts of the fixed pins 123 fitted in the fixed holes 113.

The above is the details of the present embodiment. The blade drive device 1 in the present embodiment includes: a blade 11; four groups, each group has a magnet 21 and at least one coil 121 opposite to the magnet 21, and the blade 11 is pushed to move by the electromagnetic force generated between the magnet 21 and the coil 121; and a hall IC42 that is a magnetic field position sensor that senses the magnetic field of the magnet 21 to detect the position of the magnet 21, the hall IC42 being located at a position between two adjacent groups of the four groups. Therefore, the blade drive device 1 in which the magnetic position sensor can be disposed even in a small space can be provided.

In the above embodiment, the hall IC42 may be disposed at a position where a predetermined one of all the coils 121 is surely present. For example, as shown in fig. 11, the coil 121 may not be disposed at a position where the-X-side coil 121 of the two coils 121 on the + Y side is definitely present in the rear-side coil substrate 40, and a notch 402 may be provided at the position, and the hall IC42 may be provided in the notch 402. At this time, the hall IC42 faces the magnet 21 on the + Y side.

In the above embodiment, the coil may be fixed to the movable ring 22, and the magnet may be fixed to the fixing portion. One magnet 21 may be provided for each coil 121.

In the above embodiment, the number of the groups of the magnets 21 and the coils 121 may be 2, 3, or 5 or more.

Description of the symbols:

1 a blade driving device; 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 magnet; 22 a movable ring; 30 plate-shaped springs; 40 a rear side coil substrate; 41 a circuit board; 42 Hall IC;43 a base; 70 a lens carrier; 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. 401 cutting; 121 coils; 123 fixed pins; 124 long holes; 125 holes; 127 a disk portion; 128 inner peripheral wall portion; 129 outer peripheral wall portions; 201 a wiring portion; 220 a recess; a 222 stage; a 223 gap; 224 a movable pin; 431 a pillar portion; 434 holes; 439 a thin plate portion; 701 a carrier-side receptor; 941. 951 and 961 exposed parts; 942. 952, 962 embedded parts; 943 a standing part; 953. 963 the blade side receptor.

Claims

1. A blade drive device is characterized by comprising:

a blade;

a plurality of groups, each group having a magnet and at least one coil facing the magnet, the blades being pushed to move by an electromagnetic force generated between the magnet and the coil; and

a magnetic field position sensor for detecting a position of the magnet by sensing a strength of a magnetic field of the magnet,

the magnetic field position sensor is located at a position between two adjacent groups of the plurality of groups, or at a position where a prescribed one of the coils is definitely present among all the coils.

2. Blade driving device according to claim 1,

the coil is disposed on a front side coil substrate located on a front side of the magnet and a rear side coil substrate located on a rear side of the magnet,

the magnetic field position sensor is disposed in a notch provided in the rear side coil substrate.

3. Blade driving device according to claim 1,

the magnetic field position sensor is located at a position where the predetermined one coil is surely present in the rear coil substrate, and is opposed to the magnet.

4. The blade drive device according to claim 1, comprising:

a fixed part;

a movable ring that rotates relative to the fixed portion by the thrust force to move the blades; and

a plurality of plate springs supporting the movable ring,

the magnetic field position sensor is located at a position between the two adjacent groups,

one of the plurality of plate springs is located on a front side of the magnetic position sensor.

5. A camera device comprising the blade driving device according to any one of claims 1 to 4.

6. An electronic device comprising the camera device according to claim 5.