TWI884441B - Imaging device and electronic device - Google Patents

Abstract

An imaging device and electronic device. The imaging device includes an imaging mechanism, lens elements, and a first moire lens element. The imaging mechanism includes a light emitting unit, a light receiving unit, and an imaging unit. The lens element has an axis that passes through the light receiving unit, and the lens element includes a transparent lens that can rotate around the axis. The transparent lens is equipped with a through hole coaxial with it. The first moir é lens element includes a first diffractive lens and a second diffractive lens sequentially arranged in the axis direction. 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. 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 moire lens element. The above imaging device is advantageous for miniaturization.

Description

Imaging devices and electronic devices

This application relates to the field of imaging technology, and in particular to an imaging device and an electronic device.

In daily life, we often need to use imaging devices to interpret micro-muscle changes, such as: conversations in noisy environments, talking to hearing-impaired people, talking to foreigners, using biometrics to unlock mobile phones, and polygraph systems that detect facial muscle micro-expressions. 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.

Conventional imaging devices usually use a motor to drive the lens to move along the optical axis to adjust the focus, which will increase the volume of the imaging device in the direction of the optical axis and is not conducive to the miniaturization of the imaging device.

In view of this, it is necessary to provide an imaging device that is conducive to miniaturization.

The embodiment of the present application provides an imaging device, which includes an imaging mechanism, a lens element and a first moiré lens element. 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 destination 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 in the destination area, and the imaging unit is configured to generate image information and distance information of the target. The lens element 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 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. 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 technical effects of the embodiments of the present application include: In the above-mentioned 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 to drive the first diffraction lens to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens element, 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 in the axial direction can be reduced, which is conducive to the miniaturization of the imaging device.

Optionally, in some embodiments of the present application, the imaging device further includes 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 includes 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.

Optionally, in some embodiments of the present application, the lens element 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 element, the second moiré lens element includes a third diffraction lens and a fourth diffraction lens sequentially arranged 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 is fixedly connected to the housing, the second rim is transmission-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 element.

Optionally, in some embodiments of the present application, the lens element 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 in the first rim, the first driven wheel abuts against the first rim, the plurality of second driven wheels abut against the periphery of the first driven wheel and the periphery of the second rim respectively, and at least part of the second driven wheel abuts between the first driven wheel and the second rim.

Optionally, in some embodiments of the present application, the imaging device includes a driving mechanism, the driving mechanism includes a driving member and a friction wheel, the driving member is located on one side of the housing 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 axial direction, for driving the first wheel rim to rotate.

Optionally, in some embodiments of the present application, the imaging device includes a deceleration mechanism, the deceleration mechanism includes a disk and an electromagnetic component, the disk is fixedly connected to the shaft and rotates synchronously with the friction wheel, the electromagnetic component is located on one side of the disk, and the electromagnetic component is used to generate a magnetic field acting on the disk to generate electromagnetic resistance to the disk.

Optionally, in some embodiments of the present application, the electromagnetic component includes a magnetic permeable portion, a coil portion, and a power supply portion, the magnetic permeable portion extends along the axial direction of the shaft and is spaced apart from the disk, the coil portion is sleeved on the magnetic permeable portion and electrically connected to the power supply portion, and the power supply portion causes the coil portion to pass current and causes the magnetic permeable portion to generate a magnetic field.

Optionally, in some embodiments of the present application, along the axial direction, a friction surface is provided in an annular shape on one side of the first rim facing the friction wheel, and the friction surface abuts against the friction wheel.

Optionally, 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.

Optionally, in some embodiments of the present application, the imaging device further includes a circuit board component, the housing is fixedly connected to the circuit board component, and the imaging mechanism is electrically connected to the circuit board component.

The embodiments of this application also provide an electronic device, including an imaging device described in any one of the above embodiments.

100: Imaging device

200: Electronic devices

10: Imaging mechanism

11: Light emitting unit

L2: optical axis

12: Light receiving unit

13: Imaging unit

14: Shell

15: Flexible circuit board

20: Lens assembly

L1: axis

21: Transparent lens

211:Through hole

22: First lap

221: Bearing wall

222: abutting wall

223: Support wall

224: First step

225: Second step

226: Friction surface

23: Second round

24:First driven wheel

25: Second driven wheel

30: The first moiré lens assembly

31: The first diffraction lens

32: Second diffraction lens

40: Shell

41: First optical through hole

42: Second optical through hole

43:convex part

50: Second moiré lens element

51: The third diffraction lens

52: The fourth diffraction lens

60: Driving mechanism

61:Driver

611: Rotating axis

62: Friction wheel

70: Speed reduction mechanism

71:Disc

711: First Area

712: Second Area

72: Electromagnetic parts

721: Magnetic conductivity part

722: Coil Department

723: Power Supply Department

80: Circuit board components

Figure 1 shows a schematic diagram of the first viewing angle structure of an imaging device of an embodiment.

Figure 2 shows a schematic diagram of the disassembled structure of an imaging device of an embodiment.

FIG3 is a schematic diagram showing a partial structure of a lens element in an imaging device of an embodiment.

Figure 4 shows a cross-sectional view of Figure 1 along the section line A-A.

Figure 5 shows a schematic diagram of the second viewing angle structure of an imaging device of an embodiment.

Figure 6 shows a schematic diagram of the third viewing angle structure of an imaging device of an embodiment.

FIG7 shows a schematic diagram of the structure of an electronic device of an embodiment.

The following will describe the technical solutions in the embodiments of this application in conjunction with the attached figures in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them.

It should be noted that when a component is considered to be "set on" another component, it can be set directly on the other component or it may also exist in the center component at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of this application. The terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

It can be understood that when describing two components being arranged vertically, the angle between the two components is allowed to have a tolerance of ±10% relative to the standard verticality.

An embodiment of the present application provides an imaging device, which includes an imaging mechanism, a lens element, and a first moiré lens element. 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 a destination area with irradiation light, the light receiving unit is configured to receive natural light and reflected light of the irradiation light from a target in the destination area, and the imaging unit is configured to generate image information and distance information of the target. The lens element has an axis passing through the light receiving unit, and the lens element 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 element 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. 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 element.

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 to drive the first diffraction lens to rotate relative to the second diffraction lens to adjust the focal length of the first moiré lens element, 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 in the axial direction can be reduced, which is conducive to the miniaturization of the imaging device.

The following is a detailed description of some embodiments of this application in conjunction with the attached figures.

Please refer to FIG. 1 and FIG. 2 together. The embodiment of the present application provides an imaging device 100, including an imaging mechanism 10, a lens element 20 and a first moiré lens assembly 30.

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 destination 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 in the destination 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. Specifically, the imaging unit 13 calculates the distance information of the target 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.

The lens element 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 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, the projection of the light emitting unit 11 is within the projection range of the transparent lens 21. The transparent lens 21 will not affect the irradiation light of the light emitting unit 11. The irradiation light of the light emitting unit 11 passes through the transparent lens 21 to irradiate the target area, thereby reducing the risk of the transparent lens 21 interfering with the irradiation light of the light emitting unit 11 when rotating.

The first moiré lens assembly 30 includes a first diffractive lens 31 and a second diffractive lens 32 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 element 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 diffraction lens 32 is fixedly connected to the housing 14 so that the second diffraction lens 32 is supported by the housing 14 and is located between the first diffraction lens 31 and the light receiving unit 12. The transparent lens 21 is used to drive the first diffraction lens 31 to rotate relative to the second diffraction lens 32 to adjust the focal length of the first moiré lens assembly 30.

In the above-mentioned 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 to drive the first diffraction lens 31 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 the miniaturization of the imaging device 100.

Please continue to refer to FIG. 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 arranged at intervals, 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 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 wheel 22 is used as a force point to rotate relative to the housing 40 under the action of external force, thereby driving the transparent lens 21 to rotate synchronously to improve the stability of the position between the transparent lens 21 and the imaging mechanism 10.

In some embodiments, the lens element 20 further includes a second rim 23, which is 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 is arranged parallel to the optical axis L2.

The imaging device 100 further includes a second moiré lens element 50, which includes a third diffractive lens 51 and a fourth diffractive lens 52 arranged in sequence 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 element 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 element 50. The second rim 23 is 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 element 50.

It should be noted that since the focal length of the first moiré lens element 30 and the focal length of the second moiré lens element 50 have a certain linear relationship, the first rim 22 and the second rim 23 can be used to synchronously adjust the focal length of the first moiré lens element 30 and the focal length of the second moiré lens element 50 to improve the imaging efficiency.

Please refer to FIG. 3 , in some embodiments, the lens element 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 in 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 periphery of the first driven wheel 24 and the periphery of the second rim 23, respectively, to balance the torque stress of the first driven wheel 24 and the second rim 23 when they rotate, 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 wheel 25 abuts between the first driven wheel 24 and the second rim 23. 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.

Specifically, during use, the first rim 22 is used as a force point to rotate relative to the housing 40 under the action of external force. The first rim 22 drives the transparent lens 21 to rotate synchronously, so that the first diffraction lens 31 rotates relative to the second diffraction 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 diffraction lens 51 rotates relative to the fourth diffraction lens 52, thereby adjusting the focal length of the second moiré lens element 50.

Optionally, there are four second driven wheels 25, two of which abut between the first driven wheel 24 and the second wheel rim 23, and the other two abut between the first driven wheel 24 and the second wheel rim 23, respectively. The first driven wheel 24 is sandwiched between three second driven wheels 25, and the second wheel rim 23 is sandwiched between three second driven wheels 25, so as to improve the stability of the rotation of the first driven wheel 24 and the second wheel rim 23.

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

It can be understood that by adjusting the diameter ratio between the first rim 22, the second rim 23, the first driven wheel 24, and the second driven wheel 25, the transmission ratio of the first rim 22 and the second rim 23 is adjusted, thereby facilitating the synchronous adjustment of the focal length of the first moiré lens element 30 and the focal length of the second moiré lens element 50 to improve the imaging efficiency.

It can be understood that the first wheel 22, the second wheel 23, the first driven wheel 24, and the second driven wheel 25 can also be gear structures that mesh with each other to improve the accuracy of synchronous rotation.

Please refer to FIG. 4 . In some embodiments, along the axis L1, the inner ring of the first rim 22 includes a supporting wall 221, a contact wall 222, and a supporting wall 223 arranged in sequence. The supporting wall 223, the contact wall 222, and the supporting wall 221 are respectively away from the light receiving unit 12. The supporting wall 221 contacts 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 contact wall 222 contacts the first driven wheel 24 in the radial direction of the axis L1. When the first rim 22 rotates, the contact 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 stability of the connection between the first rim 22 and the housing 40.

Along the axis L1 direction, the abutting wall 222 protrudes toward the axis L1 relative to the supporting wall 221 and the supporting wall 223. A first step surface 224 is provided between the supporting wall 221 and the abutting wall 222, and the first step surface 224 abuts 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 the housing 40 in the direction of the axis L1 to improve the connection stability between the first rim 22 and the housing 40.

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.

In some embodiments, the housing 40 is provided with at least three protrusions 43 spaced about the axis L1, each protrusion 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 protrusion 43 is provided with an arc surface that is contoured with the support wall 223, so that the first rim 22 can rotate relative to the housing 40.

Please refer to FIG. 5 . In some embodiments, the imaging device 100 includes a driving mechanism 60 , which 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 to drive the first wheel rim 22 to rotate. Optionally, the axis of the rotating shaft 611 is perpendicular to the direction of the axis L1.

Optionally, the driving member 61 is an ultrasonic motor, which is beneficial to improve driving accuracy and reduce noise interference.

In some embodiments, along the axis L1 direction, a friction surface 226 is provided on one side of the first rim 22 facing the friction wheel 62, and the friction surface 226 abuts against the friction wheel 62 to improve the stability of the friction wheel 62 driving the first 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 axis L1 direction.

Please refer to FIG. 6 . In some embodiments, the imaging device includes a deceleration mechanism 70. The deceleration mechanism 70 includes a disk 71 and an electromagnetic member 72. The disk 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 disk 71. The electromagnetic member 72 is used to generate a magnetic field acting on the disk 71 to generate electromagnetic resistance on the disk 71. Under the continuous action of the electromagnetic resistance, the disk 71 is continuously subjected to the resistance in the opposite direction of rotation and gradually changes from a moving state to a stopped state, so that the rotating shaft 611 is synchronously decelerated, and finally the rotating shaft 611 and the friction wheel 62 stop rotating. The speed reduction 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.

In some embodiments, the electromagnetic component 72 includes a magnetic permeable portion 721, a coil portion 722 and a power supply portion 723. The magnetic permeable portion 721 extends along the axial direction of the rotation shaft 611 and is spaced apart from the disk 71. The coil portion 722 is sleeved on the magnetic permeable portion 721 and electrically connected to the power supply portion 723. The power supply portion 723 causes the coil portion 722 to pass current and causes the magnetic permeable portion 721 to generate a magnetic field.

When the rotating disk 71 needs to stop rotating, the power supply unit 723 is controlled to output current to the coil unit 722, so that the magnetic permeable unit 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 permeable unit 721 along its rotation direction, and the second area 712 is defined as the area where the disk 71 is about to leave the magnetic permeable unit 721 along its rotation direction. According to Faraday's law, the magnetic field generated by the magnetic permeable unit 721 will cause the disk 71 to form multiple 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 region 711 will generate a magnetic field in the opposite direction to the magnetic field of the magnetic permeable portion 721 to resist the magnetic flux increased by approaching the magnetic permeable portion 721, and the eddy current formed in the second region 712 will generate a magnetic field in the same direction as the magnetic field of the magnetic permeable portion 721 to compensate for the magnetic flux reduced by approaching the magnetic permeable portion 721.

Since the magnetic field of the first area 711 is in opposite directions to the magnetic field of the magnetic permeable part 721, the electromagnetic component 72 generates an attractive force on the first area 711, preventing the first area 711 from moving away. Since the magnetic field of the second area 712 is in the same direction as the magnetic field of the magnetic permeable part 721, the electromagnetic component 72 generates a repulsive force on the second area 712, preventing the second area 712 from moving closer to the magnetic field of the magnetic permeable part 721. The combination of the attractive force and the repulsive force forms an electromagnetic resistance. The electromagnetic component 72 does not directly contact the disk 71, which can reduce the heat loss and wear of the disk 71.

Optionally, the electromagnetic resistance can be increased by increasing the output current of the power supply unit 723, or by increasing the number of windings of the coil unit 722, or by increasing the number of control electromagnetic components 72.

Please refer to FIG. 1 and FIG. 2 together. In some embodiments, the imaging device 100 further includes a circuit board component 80, the housing 40 is fixedly connected to the circuit board component 80, and the imaging mechanism 10 is electrically connected to the circuit board component 80. The circuit board component 80 is used to supply power to the imaging mechanism 10. Optionally, the imaging mechanism 10 is electrically connected to the circuit board component 80 via a flexible circuit board 15.

The circuit board component 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.

Please refer to Figure 7. The embodiment of the present application also provides an electronic device 200, and the electronic device 200 includes any imaging device 100 in the above embodiments. The electronic device 200 can be, but is not limited to, a hearing aid, a visual aid, an imaging meter, a mobile phone, etc.

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 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 to drive the first diffraction lens 31 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 the miniaturization of the imaging device 100.

Ordinary technical personnel in this technical field should recognize that the above embodiments are only used to illustrate this application, and are not used to limit this application. As long as they are within the scope of the essence of this application, appropriate changes and modifications made to the above embodiments are within the scope of disclosure of this application.

100: Imaging device 10: Imaging mechanism 11: Light emitting unit L2: Optical axis 12: Light receiving unit 14: Housing 15: Flexible circuit board 20: Lens assembly L1: Axis 21: Transparent lens 211: Through hole 22: First rim 40: Housing 60: Driving mechanism 61: Driving part 62: Friction wheel 70: Speed reduction mechanism 71: Disc 72: Electromagnetic part 80: Circuit board component

Claims (9)

An imaging device, the improvement of which is that the imaging device comprises: An imaging mechanism, comprising 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 a destination area with irradiation light, the light receiving unit is configured to receive natural light and reflected light of the irradiation light from a target in the destination area, and the imaging unit is configured to generate image information and distance information of the target; A lens element having an axis passing through the light receiving unit, the lens assembly including a transparent lens that can rotate around the axis, the transparent lens having 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 element includes a first diffraction lens and a second diffraction lens sequentially arranged 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; The imaging device further includes 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, the light emitting unit is exposed from the second light through hole, the lens element includes 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; The lens element further includes a second rim, which 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 element, which includes a third diffraction lens and a fourth diffraction lens sequentially arranged in the direction of the optical axis. The third diffraction lens is fixedly connected to the second rim, and the fourth diffraction lens is located in the second light through hole and fixedly connected to the housing. The second rim is transmission-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 element. An imaging device as described in claim 1, wherein: the lens element 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 in the first rim, the first driven wheel abuts against the first rim, the plurality of second driven wheels abut against the circumference of the first driven wheel and the circumference of the second rim respectively, and at least a portion of the second driven wheel abuts between the first driven wheel and the second rim. An imaging device as described in claim 2, wherein: the imaging device includes a driving mechanism, the driving mechanism includes a driving member and a friction wheel, the driving member is located on one side of the housing 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 axial direction for driving the first wheel rim to rotate. An imaging device as described in claim 3, wherein: the imaging device includes a deceleration mechanism, the deceleration mechanism 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. An imaging device as described in claim 4, wherein: the electromagnetic component includes a magnetic conductive portion, a coil portion and a power supply portion, the magnetic conductive portion extends along the axial direction of the rotating shaft and is spaced apart from the disk, the coil portion is sleeved on the magnetic conductive portion and electrically connected to the power supply portion, and the power supply portion causes the coil portion to pass electric current and cause the magnetic conductive portion to generate a magnetic field. An imaging device as described in claim 3, wherein: along the axial direction, a ring-shaped friction surface is provided on one side of the first rim facing the friction wheel, and the friction surface abuts against the friction wheel. An imaging device as described in claim 3, wherein: along the axis direction, the inner ring of the first wheel ring 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 housing 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 housing in the direction of the axis. An imaging device as described in claim 1, wherein: the imaging device further includes a circuit board component, the housing is fixedly connected to the circuit board component, and the imaging mechanism is electrically connected to the circuit board component. An electronic device, the improvement of which comprises an imaging device as described in any one of claims 1 to 8.

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