Blade driving device, imaging device, and portable electronic device

Abstract

To provide a blade driving device, an imaging device, and a portable electronic device.SOLUTION: A blade driving device includes a housing, a rotary body, a blade, a driving coil, a circuit board, and at least one magnetic yoke. At least one rotating shaft extending into housing space is provided in the housing, the rotary body is a magnetic member having at least two magnetic poles, one end of the blade is fixedly connected to the rotary body and rotates following the rotary body, and a shielding portion and an opening portion are provided at another end of the blade. Orthographic projection of the driving coil in a passage direction of an optical axis has the rotary body and an overlapping area, the circuit board is electrically connected to the driving coil, and at least one magnetic yoke is fixed to the housing. Compared with a conventional technique, by reducing the number of components to be mounted to miniaturize the device, space is efficiently utilized, a structure and assembly are simplified, and more efficient blade driving can be achieved with a simpler structure.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to the technical field of imaging devices, and more particularly to a blade drive device, an imaging device, and a portable electronic device. [Background technology]

[0002] With the rapid development of imaging technology, blade drive devices and lens drive devices are widely used in many imaging devices. Optical devices with blade drive devices are applied to various portable electronic devices, such as mobile phones, tablets, etc., and are particularly popular with consumers.

[0003] Blade drive devices drive one or more blades to change the state of the aperture, and are used in various optical units such as cameras as shutters, diaphragms, combined diaphragm shutters, color filters, etc. In these blade drive devices, the electromagnetic actuator is separate during the assembly stage, so there is a risk that the difficulty of constructing the blade drive device itself will increase due to interactions such as poor assembly, an increase in the number of parts, and various loosening caused by the increase in the number of parts.

[0004] There are moving units that use shape memory alloys that have a small structural area, but when a large amount of deformation is required, the length of the shape memory alloy must be increased.

[0005] Furthermore, when trying to achieve multiple arbitrary stopping positions with a single actuator, there are issues such as the need to magnetize the magnet in multiple poles and the need to adjust the shape of the magnet pieces at very precise angles, which makes the design and manufacturing more difficult.

[0006] Therefore, it is necessary to provide a new blade drive device that can solve the above problems. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-10430 A [Patent Document 2] JP 2010-276654 A [Patent Document 3] Japanese Patent Application Publication No. 10-68979 [Patent Document 4] JP 2019-203944 A [Patent Document 5] JP 2019-148699 A [Patent Document 6] Patent Application No. 2018-162621 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention provides a blade drive device, an imaging device, and a portable electronic device to solve the problem of increasing difficulty in designing and manufacturing the configuration of a blade drive device that allows a user to appropriately adjust the amount of light when taking a picture. [Means for solving the problem]

[0009] According to a first aspect, the present invention provides a blade drive device. The blade driving device includes a housing, a rotor, a blade, a driving coil, a circuit board, and at least one magnetic yoke; the housing includes a base having a first through hole and a cover plate having a second through hole, the first through hole and the second through hole form an optical axis passage, the base and the cover plate form an accommodation space, and the housing is provided with a rotation shaft extending into at least one of the accommodation spaces; the rotating body is a magnetic member having at least two magnetic poles, the rotating body is provided with a pivot hole, the pivot hole is fitted onto the rotating shaft, and the rotating body is rotatable about the rotating shaft; one end of the blade is fixedly connected to the rotating body and rotates following the rotating body, and the other end of the blade is provided with a shielding portion and an opening, the shielding portion is formed in a circumferential direction of the opening, and the optical axis passage is located within a moving path of the opening, an orthogonal projection of the drive coil on the optical axis path has an overlapping area with the rotor; the circuit board is electrically connected to the drive coil; The at least one magnetic yoke is fixed to the housing.

[0010] In the above-mentioned blade driving device, preferably, the rotating body, the driving coil and the circuit board are arranged in sequence along the optical axis passage, the blade driving device includes two magnetic yokes, the two magnetic yokes are arranged at a distance from each other to form an included angle, and the orthogonal projections of the two magnetic yokes on the optical axis passage have an overlapping area with the rotating body.

[0011] In the blade drive device as described above, the magnetic yoke is preferably located on one side of the drive coil away from the rotor.

[0012] In the blade drive device as described above, preferably, there are two drive coils, each of which is provided to face a different magnetic pole of the rotor.

[0013] In the blade drive device as described above, preferably, two of the blades and two of the rotating bodies are provided within the accommodation space, the two blades are fixed to the two rotating bodies, respectively, the multiple blades have the openings with different inner diameters, and the optical axis passage is located within the movement paths of the multiple blades.

[0014] In the blade drive device as described above, preferably, a plurality of the openings are provided, and the optical axis passage is located within the movement path of each of the openings.

[0015] In the blade drive device as described above, the openings preferably have different inner diameters.

[0016] In the blade drive device as described above, a position detection element capable of detecting magnetic flux of the rotor is preferably provided within the accommodation space.

[0017] In the blade drive device as described above, preferably the blade is provided with a countersunk hole and the rotor extends into the countersunk hole to form a rigid connection.

[0018] According to a second aspect, the present invention provides an imaging device including the blade drive device described above.

[0019] According to a third aspect, the present invention provides a portable electronic device comprising an imaging device as described above. Effect of the Invention

[0020] Compared to the prior art, the present invention connects one end of the blade to the rotor to form an integral structure, which causes the blade to rotate as the rotor rotates. This solves technical issues such as the difficulty of assembly using a separate drive structure in the prior art and the high level of difficulty of construction, and by reducing the number of parts required, the invention achieves a more compact design, makes efficient use of space, and simplifies the structure and assembly, enabling more efficient blade drive with a simpler configuration. [Brief description of the drawings]

[0021] [Figure 1] 1 is a front view of a blade drive device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 1 is a side view of a blade drive device according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a rear view of the blade drive device according to the first embodiment of the present invention. [Diagram 5] FIG. 2 is an exploded perspective view of the blade drive device according to the first embodiment of the present invention. [Figure 6] FIG. 2 is a front view of a blade of a first type of configuration of the blade drive device according to the first embodiment of the present invention. [Figure 7] FIG. 4 is a front view of a blade of a second type of configuration of the blade drive device according to the first embodiment of the present invention. [Figure 8]1 is a schematic diagram showing a configuration of a rotor and a drive coil in a first type of cooperative state of the blade drive device according to the first embodiment of the present invention; [Figure 9] 4 is a schematic diagram showing a configuration of a rotor and a drive coil in a second type of cooperative state of the blade drive device according to the first embodiment of the present invention; FIG. [Figure 10] 10 is a schematic diagram showing a configuration of a rotor and a drive coil in a third type of cooperation state of the blade drive device according to the first embodiment of the present invention. FIG. [Figure 11] FIG. 2 is a schematic diagram showing a configuration of a rotor and a magnetic yoke in a first type of cooperative state of the blade drive device according to the first embodiment of the present invention. [Figure 12] 6 is a schematic diagram showing a configuration of a rotor and a magnetic yoke in a second type of cooperative state of the blade drive device according to the first embodiment of the present invention; FIG. [Figure 13] FIG. 11 is an exploded perspective view of a blade drive device according to a second embodiment of the present invention. [Figure 14] 1 is a schematic diagram showing a configuration of a portable electronic device equipped with a blade drive device of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The embodiments described below with reference to the drawings are illustrative and are intended to explain the present invention only and cannot be construed as limiting the present invention.

[0023] Example 1

[0024] As shown in FIGS. 1 to 12, an embodiment of the present invention provides a blade drive device 100, which is applied in an imaging device 200, and the blade drive device 100 blocks unnecessary light rays in the optical axis path by the blades 20, and controls the amount of light entering the imaging device 200.

[0025] In the embodiment of the present invention, the blade driving device 100 includes a housing 10 , a rotor 30 and a blade 20 .

[0026] Here, an accommodation space 13 is provided inside the housing 10, and an optical axis passage is formed in the accommodation space 13. A first through hole 15 and a second through hole 16 are provided in the housing 10, and the first through hole 15 and the second through hole 16 are arranged coaxially to form the optical axis passage.

[0027] In one possible embodiment, as shown in FIG. 2 and FIG. 5, the housing 10 is a separate structure, which is convenient for molding and assembly. Specifically, the housing 10 includes a base 11 and a cover plate 12, a first through hole 15 is provided in the base 11, a second through hole 16 is provided in the cover plate 12, the base 11 is a cassette structure with one end open, and the cover plate 12 is attached to the opening by a fixing means such as engagement, adhesion or bolt fastening to form an accommodating space 13.

[0028] As shown in Figures 2 and 5, a rotating shaft 14 is provided in the accommodation space 13. In one possible embodiment, the rotating shaft 14 is integrally molded with the base 11, which is convenient for molding, and the rotating shaft 14 is a cylindrical shaft body and is installed adjacent to the optical axis passage.

[0029] The rotating body 30 is provided with a pivot hole 31, and the rotating shaft 14 is loosely fitted into the pivot hole 31, so that the rotating body 30 can rotate about the axial direction of the rotating shaft 14. During assembly, it is only necessary to open the cover plate 12 and align the pivot hole 31 with the rotating shaft 14, thereby reducing the difficulty of manufacturing. By loosely fitting the rotating shaft 14 into the pivot hole 31, the thicknesses of the rotating shaft 14 and the rotating body 30 overlap, thereby reducing the space occupied by the housing 10 in the optical axis passage direction, which is advantageous for making the blade drive device 100 more compact.

[0030] The vane 20 is disposed in the receiving space 13, and a first end of the vane 20 is connected to the rotor 30. In one possible embodiment, the first end of the vane 20 is provided with a counterbore 23, which is stepped, and the rotor 30 extends into the counterbore 23, which is fixed in the counterbore 23 by fastening, gluing or bolting or other fastening means, so that the vane 20 can rotate synchronously with the rotation of the rotor 30. The rotor 30 extends into the counterbore 23, which can further reduce the space occupied by the housing 10 in the optical axis passage direction and can also play a role in limiting the position of the rotor 30. The shape and size of the counterbore 23 can be determined according to the shape and size of the rotor 30, and are not limited here.

[0031] In the prior art, because the blades are very thin, the shaft member supporting the blades would locally concentrate large friction due to repeated rotation of the blades, causing contamination from the shaft member and damage to the shaft member itself. In the present invention, by rigidly connecting the rotor 30 and the blades 20, a large area of ​​contact is maintained between the pivot hole 31 of the rotor 30 and the rotating shaft 14, which prevents local stress concentration on the shaft member and greatly improves durability.

[0032] As shown in Figures 5 and 6, a shielding portion 21 and an opening 22 are formed at the second end of the blade 20, the shielding portion 21 is formed in the circumferential direction of the opening 22, the optical axis passage is located within the moving path of the opening 22, and when the blade 20 moves to a predetermined position, the opening 22 is installed coaxially with the optical axis passage, and the blade 20 has the opening 22 and the shielding portion 21 which can be set to any shape, and can form an optically optimal light-shielding shape to achieve the purpose of improving performance.

[0033] 2 and 6, the opening 22 has a through-groove structure penetrating the blade 20, and in this embodiment, the opening 22 is a circular groove, but as will be understood by those skilled in the art, it may have other shapes, for example, a regular hexagon or other polygon having more than one side, and is not limited here. When the blade 20 rotates to a predetermined position, the axes of the first through hole 15, the opening 22, and the second through hole 16 overlap, and by changing the inner diameter or shape of the opening 22, the amount of light entering the imaging device 200 through the optical axis can be adjusted.

[0034] The shielding portion 21 is located in the circumferential direction of the opening 22, and the shielding portion 21 is intended to block the passage of light rays. An optimal blade 20 that matches the light source can be suitably used. In the case of visible light, a black-painted plastic shielding portion 21 can be selected, and for light other than visible light, a metal shielding portion 21 is used to meet the requirement of blocking the passage of light rays.

[0035] Furthermore, in order to drive the rotation of the rotor 30, in the embodiment of the present invention, the rotor 30 is a magnetic member, the rotor 30 is magnetized into a single-layer magnet with N and S poles, and the receiving space 13 is provided with the driving coil 40 and the circuit board 50, in one possible embodiment, the rotor is a cylindrical body, the N and S poles are arranged symmetrically along the radial direction of the rotating shaft 14, and each half of 180° is a magnetic pole, and as will be understood by those skilled in the art, one magnetic pole may be arranged every 90°, thus the rotor has four magnetic poles. In this case, two driving coils 40 may be arranged in parallel, or may be arranged in an "L" shape.

[0036] The rotating body 30, the drive coil 40 and the circuit board 50 are arranged in sequence along the optical axis passage direction, and the drive coil 40 is electrically connected to the circuit board 50. When electricity is applied to the drive coil 40, the rotating body 30 is driven to rotate by electromagnetic force, and the blades 20 can rotate together with the rotating body 30 to a predetermined position, and at the predetermined position, the opening 22 forms a hole structure concentric with the first through hole 15 and the second through hole 16.

[0037] The driving principle of the rotating body 30 is as follows.

[0038] When a current is applied to the drive coil 40, a Lorentz force is generated in the drive coil 40 due to the interaction between the magnetic field of the rotor 30 and the current flowing through the drive coil 40. Because the drive coil 40 is fixed, a reaction force acts on the rotor 30, and this reaction force becomes the driving force for the rotor 30, causing the rotor 30 to rotate about the axial direction of the rotation shaft 14.

[0039] The drive coil 40 can change the direction of rotation of the rotor 30 by changing the direction of the current, and can rotate the rotor 30 clockwise and counterclockwise in a plane perpendicular to the optical axis path.

[0040] In one possible embodiment, as shown in FIG. 8, two drive coils 40 are provided, the rotating body 30 is provided between the two drive coils 40, and the orthogonal projection of the rotating body 30 in the optical axis passage is located on the two drive coils 40, so that the rotating body 30 can utilize the magnetic forces of the two drive coils 40 simultaneously, thereby allowing the rotating body 30 to receive a larger driving force and improve the rotation efficiency of the blades 20.

[0041] In another possible embodiment, as shown in FIG. 9, only one drive coil 40 is provided, and the drive coil 40 includes a left half portion and a right half portion arranged symmetrically along the longitudinal direction of the drive coil 40, and the orthogonal projection on the optical axis passage of the rotating body 30 is located in the left half portion and the right half portion, which is advantageous in improving ease of assembly and space saving, on the premise of satisfying the driving force.

[0042] In another possible embodiment, as shown in FIG. 10, only one drive coil 40 is provided, and the drive coil 40 includes a left half portion and a right half portion arranged symmetrically along the longitudinal direction of the drive coil 40, and the orthogonal projection on the optical axis passage of the rotating body 30 is located in the left half portion or the right half portion, which is advantageous for improving ease of assembly and space saving under the premise of satisfying the driving force.

[0043] In the embodiment provided by the present invention, a magnetic yoke 60, which is a magnet piece, is disposed at the boundary of the magnetic pole of the rotor 30 at a suitable rotational position of the blade 20 in order to maintain the rotor 30 at a predetermined position. When the magnetic yoke 60 is provided at a predetermined position and the blade 20 rotates, when the boundary of the magnetic pole of the rotor 30 is aligned with the magnetic yoke 60, the blade 20 stops rotating and the opening 22 becomes coaxial with the optical axis passage. The magnetic yoke 60 is located on the side of the driving coil 40 that is away from the rotor 30, and the orthogonal projection of the magnetic yoke 60 in the optical axis direction has an overlapping area with the rotor 30, and the magnetic yoke 60, which is a magnet piece, always exerts a force that attracts the rotor 30 to the base 11, and plays a role of keeping the distance from the driving coil 40 constant while the blade 20 is driven by the electromagnetic force.

[0044] Furthermore, a plurality of magnetic yokes 60 are provided, and the orthogonal projections of the plurality of magnetic yokes 60 in the optical axis passage direction are located on the moving path of the blade 20, so that the blade 20 has a plurality of stopping positions, and as shown in FIG. 11 and FIG. 12, two magnetic yokes 60 are provided in FIG. 11, and the two magnetic yokes 60 are arranged crosswise to form a shape similar to a "V" shape or an "L" shape, and three magnetic yokes 60 are provided in FIG. 12, and the two magnetic yokes 60 are arranged crosswise to form a "Y" shape. The plurality of magnetic yokes 60 are all installed at intervals in a ring shape along the axial direction of the rotor 30. The magnetic yokes 60 provided on the base 11 may be either the two-point switching position shown in FIG. 11 or the three-point switching position shown in FIG. 12, as long as the magnetic yokes 60 are arranged at positions corresponding to the magnetic poles of the rotor 30 to be stopped, and the blades 20 having openings 22 of appropriate diameters can be stopped at a plurality of predetermined positions.

[0045] Furthermore, as shown in FIG. 5, a stopper block 17 is protruded from the base 11 to limit the range of the movement path of the rotating body 30. When the rotating body 30 rotates until it abuts against the stopper block 17, it reaches the end of the movement path and can no longer rotate.

[0046] 7, one blade 20 is provided with a plurality of openings 22, an optical axis passage is located within the movement path of each opening 22, and the blade 20 has a plurality of predetermined positions, and at each predetermined position, one opening 22 corresponds to the optical axis passage, so that the axial directions of the first through hole 15, the opening 22, and the second through hole 16 overlap. Furthermore, there is a difference between the inner diameters of the openings 22, i.e., they have different aperture diameters, and by having a plurality of aperture diameters, even with a single blade 20, the shapes of the plurality of openings 22 can be appropriately selected, and a blade 20 with good quality in terms of optical properties can be configured.

[0047] In an embodiment provided by the present invention, a position detection element (not shown) capable of detecting the magnetic flux of the rotating body 30 is provided in the accommodating space 13, and by detecting the magnetic flux of the rotating body 30, accurate position detection can be performed for the rotating body 30, thereby identifying the position of the blades 20. The position detection element is provided within the driving coil 40 and can be located in the same plane as the driving coil 40, thereby further improving the space utilization rate and reducing the height of the housing 10.

[0048] Example 2

[0049] The present embodiment differs from the first embodiment in that a plurality of blades 20 are provided in the accommodation space 13, the optical axis passage is located within the movement path of the plurality of blades 20, and correspondingly, a plurality of pivot shafts are provided in the accommodation space 13, one rotating body 30 is rotatably mounted on each of the pivot shafts, each of the blades 20 is fixed to one rotating body 30, and each of the plurality of rotating bodies 30 corresponds to one set of driving coil 40 and magnetic yoke 60, thereby ensuring the degree of freedom in alignment of the blades 20.

[0050] Specifically, as shown in FIG. 13, two blades 20 are provided in the accommodation space 13, the two blades 20 are provided on opposite sides of the optical axis passage, the optical axis passage is located within the movement path of the two blades 20, two rotating bodies 30 each correspond to a set of driving coil 40 and magnetic yoke 60, and the inner diameters of the openings 22 provided in the two blades 20 may be the same or different.

[0051] According to the blade drive device 100 provided by the above embodiment, the present invention further provides an imaging device 200 that includes the above-mentioned blade drive device 100, in which the rotor 30 that performs electromagnetic drive and the blades 20 are integrated, providing excellent assembly ease, making it possible to reduce the number of components such as the drive coil 40 and magnetic yoke 60 as necessary, and allowing a single rotor 30 to realize multiple optional stop positions, significantly reducing design difficulty, and including the light amount adjustment that the blade drive device itself has, thereby achieving the objective of improving the quality of captured images.

[0052] Moreover, as shown in FIG. 14, the present invention further provides a portable electronic device 300, such as a smart phone or a tablet device, any of which includes the imaging device 200 described above.

[0053] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. However, the above is only a preferred embodiment of the present invention, and the present invention is not limited to the scope of implementation shown in the drawings. Any modifications made to the concept of the present invention or equivalent modifications to equivalent embodiments that are equivalent changes should still fall within the scope of protection of the present invention, provided that they do not exceed the spirit contained in the specification and drawings. [Explanation of symbols]

[0054] 10-Housing 11-Pedestal 12-Cover Plate 13-Containment Space 14-Rotation axis 15-First through hole 16-Second through hole 17-Stopper block 20-Feather 21-Shielding part 22-Opening 23-Counterbore 30-rotation body 31- Pivot hole 40-Drive coil 50-Circuit Board 60-Magnetic Yoke 100-Blade Drive Unit 200-Imaging device 300-Portable Electronic Devices

Claims

1. A blade drive device, The blade driving device includes a housing, a rotor, a blade, a driving coil, a circuit board, and at least one magnetic yoke; the housing includes a base having a first through hole and a cover plate having a second through hole, the first through hole and the second through hole form an optical axis passage, the base and the cover plate form an accommodation space, and the housing is provided with at least one rotation shaft extending into the accommodation space; the rotating body is a magnetic member having at least two magnetic poles, the rotating body is provided with a pivot hole, the pivot hole is fitted onto the rotating shaft, and the rotating body is rotatable about the rotating shaft; one end of the blade is fixedly connected to the rotating body and rotates following the rotating body, and the other end of the blade is provided with a shielding portion and an opening, the shielding portion is formed in a circumferential direction of the opening, and the optical axis passage is located within a moving path of the opening, an orthogonal projection of the drive coil on the optical axis path has an overlapping area with the rotor; the circuit board is electrically connected to the drive coil; The blade drive device, wherein the at least one magnetic yoke is fixed to the housing.

2. the rotating body, the driving coil, and the circuit board are provided in this order along the optical axis passage, The blade drive device according to claim 1, characterized in that the blade drive device includes two magnetic yokes, the two magnetic yokes are spaced apart from each other to form an included angle, and the orthogonal projections of the two magnetic yokes on the optical axis path have an overlapping area with the rotating body.

3. 3. The blade drive device according to claim 2, wherein the magnetic yoke is located on a side of the drive coil that is away from the rotor.

4. 4. The blade driving device according to claim 3, wherein the driving coil is provided in two pieces, each of which is provided to face a different magnetic pole of the rotor.

5. The blade drive device according to claim 4, characterized in that two of the blades and two of the rotating bodies are provided within the accommodation space, the two blades are fixed to the two rotating bodies, respectively, the plurality of blades have the openings with different inner diameters, and the optical axis passage is located within the movement paths of the plurality of blades.

6. 2. The blade drive device according to claim 1, wherein a plurality of the openings are provided, and the optical axis passage is located within a movement path of each of the openings.

7. The blade drive device according to claim 6 , wherein the openings have different inner diameters.

8. 3. The blade drive device according to claim 2, further comprising a position detection element capable of detecting a magnetic flux of the rotor, the position detection element being provided in the accommodation space.

9. 2. The blade drive device according to claim 1, wherein the blade is provided with a counterbore, and the rotor extends into the counterbore to form a rigid connection.

10. 1. An imaging device, comprising: An imaging device comprising the blade drive device according to any one of claims 1 to 9.

11. A portable electronic device, A portable electronic device comprising the imaging device according to claim 10.

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