Imaging device and electronic device

Abstract

The present application discloses an imaging device and an electronic device. The imaging device includes an imaging mechanism, a lens assembly and a first moiré lens assembly. The imaging mechanism includes a light emitting unit, a light receiving unit and an imaging unit. The lens assembly has an axis passing through the light receiving unit, and the lens assembly includes a transparent lens that can rotate around the axis. The transparent lens is provided with a through hole coaxially arranged therewith. Along the axis direction, the projection of the light receiving unit is located within the projection range of the through hole, and the projection of the light emitting unit is located within the projection range of the transparent lens. The first moiré lens assembly includes a first diffraction lens and a second diffraction lens sequentially arranged in the axis direction, the first diffraction lens is located in the through hole and fixedly connected to the transparent lens, the second diffraction lens is fixedly connected between the first diffraction lens and the light receiving unit, and the transparent lens is used to drive the first diffraction lens to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly. The above imaging device is conducive to miniaturization.

Description

Technical Field

[0001] The present application relates to the field of imaging technology, and in particular to an imaging device and an electronic device. Background Art

[0002] In daily life, it is often necessary to interpret micro-muscle changes through imaging devices, such as: conversations in noisy environments, conversations with hearing-impaired people, conversations with foreigners, unlocking mobile phones using biometrics, lie detection systems that detect facial muscle micro-expressions, etc. In order to further enhance image quality and resolution, it is necessary to obtain distance information before shooting, thereby increasing the speed of autofocus adjustment, assisting in image shooting, and performing three-dimensional image performance of two-dimensional images.

[0003] Existing imaging devices usually use a motor to drive the lens to move along the optical axis to adjust the focus, which increases the volume occupied by the imaging device in the direction of the optical axis and is not conducive to the miniaturization of the imaging device. Summary of the invention

[0004] In view of the above situation, it is necessary to provide an imaging device that is conducive to miniaturization.

[0005] An embodiment of the present application provides an imaging device, which includes an imaging mechanism, a lens assembly, and a first moiré lens assembly. The imaging mechanism includes a light emitting unit, a light receiving unit, and an imaging unit, wherein the light emitting unit and the light receiving unit are arranged at intervals, the light emitting unit is configured to illuminate a target area with an irradiation light, the light receiving unit is configured to receive natural light and reflected light of the irradiation light from a target object in the target area, and the imaging unit is configured to generate image information and distance information of the target object. The lens assembly has an axis passing through the light receiving unit, the lens assembly includes a transparent lens rotatable around the axis, the transparent lens is provided with a through hole coaxially arranged therewith, along the axis direction, the projection of the light receiving unit is located within the projection range of the through hole, and the projection of the light emitting unit is located within the projection range of the transparent lens. The first moiré lens assembly includes a first diffraction lens and a second diffraction lens arranged in sequence in the axial direction, the first diffraction lens is located in the through hole and fixedly connected to the transparent lens, the second diffraction lens is fixedly connected between the first diffraction lens and the light receiving unit, and the transparent lens is used to drive the first diffraction lens to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly.

[0006] In the above imaging device, the light receiving unit receives natural light and reflected light of the irradiation light through the through hole, and the irradiation light of the light emitting unit irradiates the target area through the transparent lens. By rotating the transparent lens, the first diffraction lens is driven to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly. Compared with the existing method of driving the lens to move along the optical axis to adjust the focal length, the volume occupied by the imaging device in the axial direction can be reduced, which is conducive to the miniaturization of the imaging device.

[0007] In some embodiments of the present application, the imaging device further comprises a housing, the housing is provided with a first light through hole and a second light through hole arranged at intervals, the imaging mechanism is accommodated in the housing, the light receiving unit is exposed from the first light through hole, and the light emitting unit is exposed from the second light through hole. The lens assembly comprises a first rim, the first rim is rotatably sleeved on the housing around the axis, and the transparent lens is fixedly connected to the first rim.

[0008] In some embodiments of the present application, the lens assembly further includes a second rim, the second rim is located in the first rim and is rotatably connected to the housing around the optical axis of the light emitting unit. The imaging device further includes a second moiré lens assembly, the second moiré lens assembly includes a third diffractive lens and a fourth diffractive lens sequentially arranged in the direction of the optical axis, the third diffractive lens is fixedly connected to the second rim, the fourth diffractive lens is located in the second light through hole and is fixedly connected to the housing, and the second rim is drivingly connected to the first rim, and is used to rotate synchronously with the first rim to adjust the focal length of the second moiré lens assembly.

[0009] In some embodiments of the present application, the lens assembly includes a first driven wheel and a plurality of second driven wheels rotatably connected to the housing, the first driven wheel and the plurality of second driven wheels are located within the first rim, the first driven wheel abuts against the first rim, the plurality of second driven wheels respectively abut against the circumference of the first driven wheel and the circumference of the second rim, and at least a portion of the second driven wheels abuts between the first driven wheel and the second rim.

[0010] In some embodiments of the present application, the imaging device includes a driving mechanism, which includes a driving member and a friction wheel. The driving member is located on one side of the shell in the radial direction of the axis, the driving member is provided with a rotating shaft, the friction wheel is fixedly connected to the rotating shaft, and the friction wheel also abuts against one side of the first wheel rim in the direction of the axis for driving the first wheel rim to rotate.

[0011] In some embodiments of the present application, the imaging device also includes a deceleration mechanism, which includes a disc and an electromagnetic component. The disc is fixedly connected to the rotating shaft and rotates synchronously with the friction wheel. The electromagnetic component is located on one side of the disc, and the electromagnetic component is used to generate a magnetic field acting on the disc to generate electromagnetic resistance to the disc.

[0012] In some embodiments of the present application, the electromagnetic component includes a magnetic conductive part, a coil part and a power supply part. The magnetic conductive part extends along the axial direction of the rotating shaft and is spaced apart from the disc. The coil part is sleeved on the magnetic conductive part and electrically connected to the power supply part. The power supply part allows current to pass through the coil part and causes the magnetic conductive part to generate a magnetic field.

[0013] In some embodiments of the present application, along the axial direction, a side of the first rim facing the friction wheel is provided with an annular friction surface, and the friction surface abuts against the friction wheel.

[0014] In some embodiments of the present application, along the axis direction, the inner ring of the first wheel rim includes a bearing wall, an abutting wall and a supporting wall arranged in sequence, the bearing wall abuts the transparent lens in the radial direction of the axis, the abutting wall abuts the first driven wheel in the radial direction of the axis, and the supporting wall abuts the shell in the radial direction of the axis. A first step surface is provided between the bearing wall and the abutting wall, the first step surface abuts the transparent lens in the direction of the axis, a second step surface is provided between the abutting wall and the supporting wall, and the second step surface abuts the shell in the direction of the axis.

[0015] In some embodiments of the present application, the imaging device further includes a circuit board assembly, the housing is fixedly connected to the circuit board assembly, and the imaging mechanism is electrically connected to the circuit board assembly.

[0016] An embodiment of the present application provides an electronic device, comprising the imaging device described in any one of the above embodiments.

[0017] In the imaging device and electronic device, the light receiving unit receives natural light and reflected light of the irradiation light through the through hole, and the irradiation light of the light emitting unit irradiates the target area through the transparent lens. By rotating the transparent lens, the first diffraction lens is driven to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly. Compared with the existing method of driving the lens to move along the optical axis to adjust the focal length, the volume occupied by the imaging device in the axial direction can be reduced, which is conducive to the miniaturization of the imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the first viewing angle structure of an imaging device in an embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of the disassembled structure of an imaging device in one embodiment of the present application.

[0020] Figure 3 It is a partial structural schematic diagram of a lens assembly in an imaging device in an embodiment of the present application.

[0021] Figure 4 yes Figure 1 Section view along section line AA.

[0022] Figure 5 It is a schematic diagram of the second viewing angle structure of the imaging device in one embodiment of the present application.

[0023] Figure 6 It is a schematic diagram of the third viewing angle structure of the imaging device in one embodiment of the present application.

[0024] Figure 7 It is a schematic diagram of the structure of an electronic device in one embodiment of the present application.

[0025] Main component symbols

[0026] Imaging device 100

[0027] Electronic device 200

[0028] Imaging mechanism 10

[0029] Light emitting unit 11

[0030] Optical axis L2

[0031] Light receiving unit 12

[0032] Imaging unit 13

[0033] Housing 14

[0034] Flexible circuit board 15

[0035] Lens assembly 20

[0036] Axis L1

[0037] Clear lens 21

[0038] Through hole 211

[0039] First lap 22

[0040] Load-bearing wall 221

[0041] Abutment wall 222

[0042] Support wall 223

[0043] First step surface 224

[0044] Second step surface 225

[0045] Friction surface 226

[0046] Second round 23

[0047] The first driven wheel 24

[0048] Second driven wheel 25

[0049] First moiré lens assembly 30

[0050] The first diffractive lens 31

[0051] The second diffractive lens 32

[0052] Housing 40

[0053] First optical through hole 41

[0054] Second optical through hole 42

[0055] Projection 43

[0056] The second moiré lens assembly 50

[0057] The third diffractive lens 51

[0058] Fourth diffractive lens 52

[0059] Driving mechanism 60

[0060] Driving member 61

[0061] Shaft 611

[0062] Friction wheel 62

[0063] Speed ​​reduction mechanism 70

[0064] Disc 71

[0065] First Area 711

[0066] Second area 712

[0067] Electromagnetic parts 72

[0068] Magnetic conductive part 721

[0069] Coil part 722

[0070] Power Supply 723

[0071] Circuit board assembly 80

[0072] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0074] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0076] It should be understood that, considering the actual processing tolerance factors, in the technical solution of the present application, when the two elements are arranged parallel / vertically and in the same direction, there may be a certain angle between the two elements, and a tolerance of 0-±10% is allowed between the two elements. The tolerance of the two elements greater than, equal to or less than 0-±10% is allowed.

[0077] The embodiment of the present application provides an imaging device, which includes an imaging mechanism, a lens assembly and a first moiré lens assembly. The imaging mechanism includes a light emitting unit, a light receiving unit and an imaging unit, the light emitting unit and the light receiving unit are arranged at intervals, the light emitting unit is configured to illuminate the target area with the irradiation light, the light receiving unit is configured to receive natural light and reflected light of the irradiation light from the target in the target area, and the imaging unit is configured to generate image information and distance information of the target. The lens assembly has an axis passing through the light receiving unit, the lens assembly includes a transparent lens that can rotate around the axis, the transparent lens is provided with a through hole coaxially arranged therewith, along the axis direction, the projection of the light receiving unit is located within the projection range of the through hole, and the projection of the light emitting unit is located within the projection range of the transparent lens. The first moiré lens assembly includes a first diffraction lens and a second diffraction lens arranged in sequence in the axis direction, the first diffraction lens is located in the through hole and fixedly connected to the transparent lens, the second diffraction lens is fixedly connected between the first diffraction lens and the light receiving unit, and the transparent lens is used to drive the first diffraction lens to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly.

[0078] In the above imaging device, the light receiving unit receives natural light and reflected light of the irradiation light through the through hole, and the irradiation light of the light emitting unit irradiates the target area through the transparent lens. By rotating the transparent lens, the first diffraction lens is driven to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens assembly. Compared with the existing method of driving the lens to move along the optical axis to adjust the focal length, the volume occupied by the imaging device in the axial direction can be reduced, which is conducive to the miniaturization of the imaging device.

[0079] The embodiments of the present application are further described with reference to the accompanying drawings.

[0080] Please also read Figure 1 and Figure 2 An embodiment of the present application provides an imaging device 100 , including an imaging mechanism 10 , a lens assembly 20 , and a first moiré lens assembly 30 .

[0081] The imaging mechanism 10 includes a light emitting unit 11, a light receiving unit 12 and an imaging unit 13. The light emitting unit 11 and the light receiving unit 12 are arranged at intervals, the light emitting unit 11 is configured to illuminate the target area with the irradiation light, the light receiving unit 12 is configured to receive natural light and reflected light of the irradiation light from the target object in the target area, and the imaging unit 13 is electrically connected to the light emitting unit 11 and the light receiving unit 12 and is configured to generate image information and distance information of the target object. Specifically, the imaging unit 13 calculates the distance information of the target object by calculating the time difference between the moment when the light emitting unit 11 emits the irradiation light and the moment when the light receiving unit 12 receives the reflected light. Optionally, the imaging mechanism 10 is a TOF (Time of Flight) camera.

[0082] The lens assembly 20 has an axis L1 passing through the light receiving unit 12. The lens assembly 20 includes a transparent lens 21 that can rotate around the axis L1, and the transparent lens 21 is provided with a through hole 211 coaxially arranged therewith. Specifically, the transparent lens 21 is in a circular ring shape. Along the axis L1 direction, the projection of the light receiving unit 12 is located within the projection range of the through hole 211, so that the light receiving unit 12 receives natural light and reflected light of the irradiated light through the through hole 211. Along the axis L1 direction, the projection of the light emitting unit 11 is located within the projection range of the transparent lens 21, and the transparent lens 21 will not affect the irradiated light of the light emitting unit 11. The irradiated light of the light emitting unit 11 irradiates the target area through the transparent lens 21, so as to reduce the risk of interference with the irradiated light of the light emitting unit 11 when the transparent lens 21 rotates.

[0083] The first moiré lens assembly 30 includes a first diffractive lens 31 and a second diffractive lens 32 which are sequentially arranged in the direction of the axis L1. The first diffractive lens 31 and the second diffractive lens 32 are both DOE (Diffractive Optical Elements) lenses, and the focal length of the first moiré lens assembly 30 is precisely adjusted by rotating the first diffractive lens 31 and the second diffractive lens 32 relative to each other by a certain angle. The first diffractive lens 31 is located in the through hole 211 and is fixedly connected to the transparent lens 21, and the second diffractive lens 32 is fixedly connected between the first diffractive lens 31 and the light receiving unit 12, so that the light receiving unit 12 receives natural light and reflected light of the irradiated light through the first moiré lens assembly 30. Optionally, the imaging mechanism 10 has a housing 14 for fixing the light emitting unit 11, the light receiving unit 12 and the imaging unit 13, and the second diffractive lens 32 is fixedly connected to the housing 14 so that the second diffractive lens 32 is located between the first diffractive lens 31 and the light receiving unit 12 under the support of the housing 14. The transparent lens 21 is used to drive the first diffractive lens 31 to rotate relative to the second diffractive lens 32 to adjust the focal length of the first moiré lens assembly 30 .

[0084] In the imaging device 100, the light receiving unit 12 receives natural light and reflected light of the irradiation light through the through hole 211, and the irradiation light of the light emitting unit 11 irradiates the target area through the transparent lens 21. By rotating the transparent lens 21, the first diffraction lens 31 is driven to rotate relative to the second diffraction lens 32 to adjust the focal length of the first moiré lens assembly 30. Compared with the existing method of driving the lens to move along the direction of the optical axis to adjust the focal length, the volume occupied by the imaging device 100 in the direction of the axis L1 can be reduced, which is conducive to miniaturization of the imaging device 100.

[0085] Please continue reading Figure 2 In some embodiments, the imaging device 100 further includes a housing 40, the housing 40 is provided with a first light through hole 41 and a second light through hole 42 which are spaced apart, the imaging mechanism 10 is accommodated in the housing 40, the light receiving unit 12 is exposed from the first light through hole 41, the light emitting unit 11 is exposed from the second light through hole 42, and the housing 40 is used to protect the imaging mechanism 10. The lens assembly 20 includes a first rim 22, and the first rim 22 is in a circular ring shape. The first rim 22 is rotatably sleeved on the housing 40 around the axis L1, and the transparent lens 21 is fixedly connected to the first rim 22. The first rim 22 is used as a force point to rotate relative to the housing 40 under the action of an external force, thereby driving the transparent lens 21 to rotate synchronously, so as to improve the stability of the position between the transparent lens 21 and the imaging mechanism 10.

[0086] In some embodiments, the lens assembly 20 further includes a second rim 23 in a ring shape. The second rim 23 is located inside the first rim 22 and is rotatably connected to the housing 40 around the optical axis L2 of the light emitting unit 11. The axis L1 and the optical axis L2 are arranged in parallel.

[0087] The imaging device 100 further includes a second moiré lens assembly 50, which includes a third diffractive lens 51 and a fourth diffractive lens 52 which are sequentially arranged in the direction of the optical axis L2. The third diffractive lens 51 and the fourth diffractive lens 52 are both DOE (Diffractive Optical Elements) lenses, and the focal length of the second moiré lens assembly 50 is precisely adjusted by rotating the third diffractive lens 51 and the fourth diffractive lens 52 relative to each other by a certain angle. The third diffractive lens 51 is fixedly connected to the second rim 23, and the fourth diffractive lens 52 is located in the second light through hole 42 and fixedly connected to the housing 40, so that the light emitting unit 11 emits irradiation light through the second moiré lens assembly 50. The second rim 23 is transmission-connected to the first rim 22, and is used to rotate synchronously with the first rim 22 to drive the third diffractive lens 51 to rotate relative to the fourth diffractive lens 52, thereby synchronously adjusting the focal length of the second moiré lens assembly 50.

[0088] It should be noted that, since there is a certain linear relationship between the focal length of the first moiré lens assembly 30 and the focal length of the second moiré lens assembly 50, the cooperation of the first rim 22 and the second rim 23 can facilitate the synchronous adjustment of the focal length of the first moiré lens assembly 30 and the focal length of the second moiré lens assembly 50 to improve the imaging efficiency.

[0089] Please also read Figure 3 In some embodiments, the lens assembly 20 includes a first driven wheel 24 and a plurality of second driven wheels 25 rotatably connected to the housing 40. The first driven wheel 24 and the plurality of second driven wheels 25 are located inside the first rim 22. The first driven wheel 24 abuts against the first rim 22, and the first rim 22 rotates to drive the first driven wheel 24 to rotate synchronously. The plurality of second driven wheels 25 abut against the circumference of the first driven wheel 24 and the circumference of the second rim 23, respectively, to balance the torque stress of the rotation of the first driven wheel 24 and the second rim 23, so as to improve the stability of the rotation of the first driven wheel 24 and the second rim 23. At least part of the second driven wheels 25 abuts between the first driven wheel 24 and the second rim 23, and the first driven wheel 24 rotates to drive the second driven wheel 25 between the first driven wheel 24 and the second rim 23 to rotate synchronously, thereby driving the second rim 23 to rotate synchronously.

[0090] Specifically, during use, the first rim 22 is used as a force point to rotate relative to the housing 40 under the action of an external force, and the first rim 22 drives the transparent lens 21 to rotate synchronously, so that the first diffractive lens 31 rotates relative to the second diffractive lens 32, thereby adjusting the focal length of the first moiré lens assembly 30. In addition, the first rim 22 also drives the first driven wheel 24 to rotate synchronously, and the second driven wheel 25 between the first driven wheel 24 and the second rim 23 drives the second rim 23 to rotate synchronously, so that the third diffractive lens 51 rotates relative to the fourth diffractive lens 52, thereby adjusting the focal length of the second moiré lens assembly 50.

[0091] Optionally, the number of the second driven wheels 25 is four, two of which abut between the first driven wheel 24 and the second rim 23, and the other two abut against the first driven wheel 24 and the second rim 23 respectively. Correspondingly, the first driven wheel 24 is clamped between the three second driven wheels 25, and the second rim 23 is clamped between the three second driven wheels 25, so as to improve the rotation stability of the first driven wheel 24 and the second rim 23.

[0092] It can be understood that the first driven wheel 24 can be directly abutted between the second wheel rim 23 and the first wheel rim 22, the first wheel rim 22 drives the first driven wheel 24 to rotate synchronously, and the first driven wheel 24 drives the second wheel rim 23 to rotate synchronously. Or the second wheel rim 23 can be directly abutted against the first wheel rim 22, and the first wheel rim 22 drives the first wheel rim 23 to rotate synchronously.

[0093] It can be understood that the transmission ratio of the first rim 22 and the second rim 23 is adjusted by adjusting the diameter ratio among the first rim 22, the second rim 23, the first driven wheel 24 and the second driven wheel 25, thereby facilitating the synchronous adjustment of the focal length of the first moiré lens assembly 30 and the focal length adaptation of the second moiré lens assembly 50, thereby improving the imaging efficiency.

[0094] It is understandable that the first wheel rim 22, the second wheel rim 23, the first driven wheel 24, and the second driven wheel 25 may also be mutually meshing gear structures to improve the accuracy of synchronous rotation.

[0095] Please also read Figure 4In some embodiments, along the axis L1 direction, the inner ring of the first rim 22 includes a bearing wall 221, an abutting wall 222 and a supporting wall 223 arranged in sequence. The supporting wall 223, the abutting wall 222 and the bearing wall 221 are sequentially away from the light receiving unit 12. The bearing wall 221 abuts against the transparent lens 21 in the radial direction of the axis L1 to improve the connection stability between the first rim 22 and the transparent lens 21. The abutting wall 222 abuts against the first driven wheel 24 in the radial direction of the axis L1, and when the first rim 22 rotates, the abutting wall 222 drives the first driven wheel 24 to rotate synchronously. The supporting wall 223 abuts against the housing 40 in the radial direction of the axis L1 to improve the connection stability between the first rim 22 and the housing 40.

[0096] Along the axis L1 direction, the abutting wall 222 protrudes toward the axis L1 relative to the bearing wall 221 and the supporting wall 223. A first step surface 224 is provided between the bearing wall 221 and the abutting wall 222, and the first step surface 224 abuts against the transparent lens 21 in the direction of the axis L1 to further improve the connection stability between the first rim 22 and the transparent lens 21. A second step surface 225 is provided between the abutting wall 222 and the supporting wall 223, and the second step surface 225 abuts against the housing 40 in the direction of the axis L1 to improve the connection stability between the first rim 22 and the housing 40.

[0097] Optionally, a positioning pin extending along the axis L1 is provided on the first step surface 224 , and a positioning hole cooperating with the positioning pin is provided on the transparent lens 21 to further improve the connection stability between the first rim 22 and the transparent lens 21 .

[0098] In some embodiments, at least three convex portions 43 are provided on the housing 40 and are spaced apart around the axis L1, and each convex portion 43 abuts against the support wall 223 and the second step surface 225, so that the first rim 22 is sleeved on the housing 40. Optionally, each convex portion 43 is provided with an arc surface that is arranged in the same shape as the support wall 223, so that the first rim 22 can rotate relative to the housing 40.

[0099] Please also read Figure 5 In some embodiments, the imaging device 100 includes a driving mechanism 60, and the driving mechanism 60 includes a driving member 61 and a friction wheel 62. The driving member 61 is located on one side of the housing 40 in the radial direction of the axis L1 to reduce the space waste caused by the driving member 61 in the direction of the axis L1. The driving member 61 is provided with a rotating shaft 611, and the friction wheel 62 is fixedly connected to the rotating shaft 611. The friction wheel 62 also abuts against one side of the first wheel rim 22 in the direction of the axis L1, and is used to drive the first wheel rim 22 to rotate. Optionally, the axial direction of the rotating shaft 611 is perpendicular to the direction of the axis L1.

[0100] Optionally, the driving member 61 is an ultrasonic motor, which is beneficial to improving driving accuracy and reducing noise interference.

[0101] In some embodiments, along the axis L1 direction, a side of the first wheel rim 22 facing the friction wheel 62 is provided with an annular friction surface 226, and the friction surface 226 abuts against the friction wheel 62 to improve the stability of the friction wheel 62 driving the first wheel rim 22 to rotate. Specifically, the friction surface 226 is located at one end of the support wall 223 away from the second step surface 225 in the direction of the axis L1.

[0102] Please also read Figure 6 In some embodiments, the imaging device further includes a deceleration mechanism 70, which includes a disc 71 and an electromagnetic member 72. The disc 71 is fixedly connected to the rotating shaft 611 and rotates synchronously with the friction wheel 62. The electromagnetic member 72 is located on one side of the disc 71. The electromagnetic member 72 is used to generate a magnetic field acting on the disc 71 to generate electromagnetic resistance to the disc 71. Under the continuous action of the electromagnetic resistance, the disc 71 is continuously subjected to the resistance opposite to the rotation direction and gradually changes from a moving state to a stopped state, so that the rotating shaft 611 is decelerated synchronously, and finally the rotating shaft 611 and the friction wheel 62 stop rotating. The deceleration mechanism 70 is used to cooperate with the driving member 61 to control the rotation angle of the friction wheel 62, thereby facilitating the adjustment of the rotation angle of the first wheel rim 22, which is beneficial to improving the driving accuracy.

[0103] In some embodiments, the electromagnetic component 72 includes a magnetic conductive portion 721, a coil portion 722 and a power supply portion 723. The magnetic conductive portion 721 extends along the axial direction of the rotating shaft 611 and is spaced apart from the disc 71. The coil portion 722 is sleeved on the magnetic conductive portion 721 and electrically connected to the power supply portion 723. The power supply portion 723 allows current to pass through the coil portion 722 and causes the magnetic conductive portion 721 to generate a magnetic field.

[0104] When the rotating disk 71 needs to stop rotating, the power supply part 723 is controlled to output current to the coil part 722, so that the magnetic conductive part 721 generates a magnetic field acting on the disk 71. The first area 711 is defined as the area where the disk 71 is about to approach the magnetic conductive part 721 along its rotation direction, and the second area 712 is defined as the area where the disk 71 is about to move away from the magnetic conductive part 721 along its rotation direction. According to Faraday's law, the magnetic field generated by the magnetic conductive part 721 will cause the disk 71 to form a plurality of eddy currents (i.e., vortex-shaped induced currents) in the first area 711 and the second area 712, respectively. According to Lenz's law, the eddy current formed in the first area 711 will generate a magnetic field in the opposite direction to the magnetic field of the magnetic conductive part 721 to resist the magnetic flux increased by approaching the magnetic conductive part 721, and the eddy current formed in the second area 712 will generate a magnetic field in the same direction as the magnetic field of the magnetic conductive part 721 to compensate for the magnetic flux reduced by approaching the magnetic conductive part 721.

[0105] Since the magnetic field of the first region 711 is opposite to the magnetic field of the magnetic conductive portion 721, the electromagnetic member 72 generates an attractive force on the first region 711, preventing the first region 711 from moving further away. Since the magnetic field of the second region 712 is in the same direction as the magnetic field of the magnetic conductive portion 721, the electromagnetic member 72 generates a repulsive force on the second region 712, preventing the second region 712 from moving further toward the magnetic field of the magnetic conductive portion 721. The combination of the attractive force and the repulsive force forms an electromagnetic resistance. The electromagnetic member 72 does not directly contact the disc 71, which can reduce the heat loss and wear of the disc 71.

[0106] Optionally, the electromagnetic resistance is increased by increasing the magnitude of the output current of the power supply unit 723 , or by increasing the number of winding turns of the coil unit 722 , or by increasing the number of control electromagnetic members 72 .

[0107] Please also read Figure 1 and Figure 2 In some embodiments, the imaging device 100 further includes a circuit board assembly 80, the housing 40 is fixedly connected to the circuit board assembly 80, the imaging mechanism 10 is electrically connected to the circuit board assembly 80, and the circuit board assembly 80 is used to supply power to the imaging mechanism 10. Optionally, the imaging mechanism 10 is electrically connected to the circuit board assembly 80 via a flexible circuit board 15.

[0108] The circuit board assembly 80 may also have components such as a power button, a selection button, a buzzer and a vibration motor to respectively realize the functions of switching, mode selection and alarm reminder.

[0109] See also Figure 7 The embodiment of the present application further provides an electronic device 200, which includes any one of the imaging devices 100 in the above embodiments. The electronic device 200 may be, but is not limited to, a hearing aid, a vision aid, an image measuring instrument, and a mobile phone.

[0110] In summary, in the above-mentioned imaging device 100 and electronic device 200, the light receiving unit 12 receives natural light and reflected light of the irradiated light through the through hole 211, and the irradiated light of the light emitting unit 11 irradiates the target area through the transparent lens 21. By rotating the transparent lens 21 to drive the first diffractive lens 31 to rotate relative to the second diffractive lens 32 to adjust the focal length of the first moiré lens assembly 30, compared with the existing method of driving the lens to move along the direction of the optical axis to adjust the focal length, the volume occupied by the imaging device 100 in the direction of the axis L1 can be reduced, which is conducive to the miniaturization of the imaging device 100.

[0111] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. An imaging device, characterized in that: The imaging device comprises: An imaging mechanism, comprising a light emitting unit, a light receiving unit and an imaging unit, wherein the light emitting unit and the light receiving unit are arranged at intervals, the light emitting unit is configured to illuminate a target area with an irradiation light, the light receiving unit is configured to receive natural light and reflected light of the irradiation light from a target object in the target area, and the imaging unit is configured to generate image information and distance information of the target object; A lens assembly having an axis passing through the light receiving unit, the lens assembly comprising a transparent lens rotatable around the axis, the transparent lens being provided with a through hole coaxially arranged therewith, and along the axis direction, the projection of the light receiving unit is located within the projection range of the through hole, and the projection of the light emitting unit is located within the projection range of the transparent lens; A first moiré lens assembly, comprising a first diffractive lens and a second diffractive lens sequentially arranged in the axial direction, wherein the first diffractive lens is located in the through hole and fixedly connected to the transparent lens, and the second diffractive lens is fixedly connected between the first diffractive lens and the light receiving unit, and the transparent lens is used to drive the first diffractive lens to rotate relative to the second diffractive lens to adjust the focal length of the first moiré lens assembly; The imaging device further comprises a housing, the lens assembly comprises a first rim, the first rim is rotatably sleeved on the housing around the axis, and the transparent lens is fixedly connected in the first rim; The imaging device includes a driving mechanism, which includes a driving member and a friction wheel. The driving member is located on one side of the shell in the radial direction of the axis. The driving member is provided with a rotating shaft. The friction wheel is fixedly connected to the rotating shaft. The friction wheel also abuts against one side of the first wheel rim in the direction of the axis to drive the first wheel rim to rotate.

2. The imaging device according to claim 1, wherein: The housing is provided with a first light through hole and a second light through hole which are spaced apart from each other. The imaging mechanism is accommodated in the housing. The light receiving unit is exposed from the first light through hole, and the light emitting unit is exposed from the second light through hole.

3. The imaging device according to claim 2, characterized in that The lens assembly also includes a second rim, which is located in the first rim and is rotatably connected to the shell around the optical axis of the light emitting unit. The imaging device also includes a second Moiré lens assembly, which includes a third diffraction lens and a fourth diffraction lens arranged in sequence in the direction of the optical axis, the third diffraction lens is fixedly connected to the second rim, the fourth diffraction lens is located in the second light through hole and fixedly connected to the shell, and the second rim is drivingly connected to the first rim for synchronously rotating with the first rim to adjust the focal length of the second Moiré lens assembly.

4. The imaging device according to claim 3, characterized in that The lens assembly includes a first driven wheel and a plurality of second driven wheels rotatably connected to the housing, the first driven wheel and the plurality of second driven wheels are located within the first rim, the first driven wheel abuts against the first rim, the plurality of second driven wheels respectively abut against the circumference of the first driven wheel and the circumference of the second rim, and at least a portion of the second driven wheels abuts between the first driven wheel and the second rim.

5. The imaging device according to claim 4, characterized in that The imaging device also includes a deceleration mechanism, which includes a disc and an electromagnetic component. The disc is fixedly connected to the rotating shaft and rotates synchronously with the friction wheel. The electromagnetic component is located on one side of the disc and is used to generate a magnetic field acting on the disc to generate electromagnetic resistance to the disc.

6. The imaging device according to claim 5, characterized in that The electromagnetic component includes a magnetic conductive part, a coil part and a power supply part. The magnetic conductive part extends along the axial direction of the rotating shaft and is spaced apart from the disc. The coil part is sleeved on the magnetic conductive part and electrically connected to the power supply part. The power supply part allows current to pass through the coil part and causes the magnetic conductive part to generate a magnetic field.

7. The imaging device according to claim 4, characterized in that Along the axial direction, a side of the first wheel rim facing the friction wheel is provided with an annular friction surface, and the friction surface abuts against the friction wheel.

8. The imaging device according to claim 4, characterized in that Along the axis direction, the inner ring of the first wheel rim includes a bearing wall, an abutting wall and a supporting wall arranged in sequence, the bearing wall abuts against the transparent lens in the radial direction of the axis, the abutting wall abuts against the first driven wheel in the radial direction of the axis, and the supporting wall abuts against the housing in the radial direction of the axis. A first step surface is provided between the bearing wall and the abutting wall, and the first step surface abuts the transparent lens in the direction of the axis. A second step surface is provided between the abutting wall and the supporting wall, and the second step surface abuts the shell in the direction of the axis.

9. The imaging device according to claim 2, characterized in that: The imaging device further comprises a circuit board assembly, the housing is fixedly connected to the circuit board assembly, and the imaging mechanism is electrically connected to the circuit board assembly.

10. An electronic device, characterized in that: Comprising the imaging device as claimed in any one of claims 1 to 9.

Images