WO2024040692A1 - Module de caméra à mise au point automatique de type à noyau entraîné - Google Patents

Module de caméra à mise au point automatique de type à noyau entraîné Download PDF

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Publication number
WO2024040692A1
WO2024040692A1 PCT/CN2022/123736 CN2022123736W WO2024040692A1 WO 2024040692 A1 WO2024040692 A1 WO 2024040692A1 CN 2022123736 W CN2022123736 W CN 2022123736W WO 2024040692 A1 WO2024040692 A1 WO 2024040692A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
magnet
coil
image sensor
movable seat
Prior art date
Application number
PCT/CN2022/123736
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English (en)
Chinese (zh)
Inventor
麦练智
Original Assignee
高瞻创新科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 高瞻创新科技有限公司 filed Critical 高瞻创新科技有限公司
Publication of WO2024040692A1 publication Critical patent/WO2024040692A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming

Definitions

  • the invention relates to a core-driven autofocus camera module.
  • the actuator technology has many shortcomings, which prevents this type of technology from becoming mainstream.
  • the actuator (reference patents: CN113325543A, CN214959775U and CN 112684565A) and its application camera module require a flexible circuit board to connect the image sensor in the movable structure and the electronic parts outside the fixed structure to provide power to the The image sensor sends the image signal to the electronic component.
  • the flexible circuit board can adopt a planar deformation design (reference patents: CN113325543A and CN214959775U) or a multiple folding deformation design (reference patent: CN112684565A).
  • the deformation part of the flexible circuit board also needs to occupy more space, occupying space outside the camera module, under or next to the image sensor.
  • the multiple folding deformation design and production process are complicated, which is not conducive to production cost and yield rate.
  • some core-action actuators adopt a shrapnel-type design (refer to patents: CN113325543A and CN214959775U).
  • a large current and electromagnetic force are still required to resist the force caused by the deformation of the shrapnel, resulting in greater power consumption.
  • the spring-type design is more sensitive to the size and assembly errors of the flexible circuit board, and is prone to unnecessary tilting of the image sensor during the automatic process, affecting the resolution of the image edges.
  • the magnets in some core-operated actuators (reference patent: CN112684565A) are movable. When other magnets are near the actuator, they can easily interfere with the magnets, which may cause serious magnetic interference. affect the normal operation of the actuator.
  • the circuit board under the image sensor cannot be close to the housing, affecting the heat dissipation effect.
  • the design of the actuator or camera module fails to provide an effective heat dissipation path in a limited space. Poor heat dissipation can lead to a higher temperature of the image sensor, which may cause more image noise or even fail to work properly.
  • the purpose of the present invention is to solve the problems that the flexible circuit board of the existing core-action autofocus camera is prone to deflection when moving, takes up a large space, and has poor heat dissipation.
  • the core-driven autofocus camera module of the present invention includes a housing, a lens provided on the housing, a circuit board provided in the housing, and a circuit board provided in the housing.
  • An image sensor is provided on the circuit board corresponding to the lens.
  • the circuit board includes a circuit board main body.
  • the image sensor is located on the circuit board main body.
  • the housing includes a shell and a movable seat. The movable seat The base slides along the axial direction of the lens and is installed in the housing.
  • the circuit board main body is installed on the movable base.
  • the camera module also includes a driving mechanism that drives the movable base to move relative to the lens.
  • the movable base is also provided with There is a position sensor for detecting the displacement of the image sensor.
  • the circuit board also includes a support connection part connected to the circuit board main body that moves up and down along with the circuit board main body, a flexible deformation support part connected to the support connection part, and A mounting base connected to the deformation support part.
  • the middle part of the deformation support part is provided with a through hole corresponding to the image sensor. The minimum distance from the plane where the deformation support part is located to the image sensor is greater than one-tenth of the corresponding lens height;
  • the mounting base is electrically connected to the main body of the circuit board, and the mounting base is installed in the housing.
  • the housing is provided with more than two lenses, and each lens is provided with a movable seat, a circuit board, an image sensor, a driving mechanism and a position sensor.
  • the driving mechanism is a voice coil motor driving mechanism, the first coil of the voice coil motor driving mechanism is installed on the movable seat, and the first magnet of the voice coil motor is installed on the casing.
  • One side of the movable seat is connected to the shell through rolling balls.
  • the side of the movable seat corresponding to the ball is provided with a magnetic conductive seat.
  • the side of the shell corresponding to the ball is provided with a magnetic conductive seat opposite to the magnetic conductive seat. Adsorbed by the second magnet.
  • the first coil is located on the other side of the movable seat adjacent to the magnetic conductive seat.
  • the first magnet is arranged corresponding to the first coil.
  • the first magnet adopts single-sided bipolar magnetization.
  • the upper side of the magnet facing the coil is the north pole, and the lower side of the first magnet facing the coil is the south pole.
  • the first coil is located on the other side of the movable seat adjacent to the magnetic conductive seat.
  • the first magnet is arranged corresponding to the first coil.
  • the first magnet includes a third magnet arranged oppositely up and down.
  • the fourth magnet, the third magnet and the fourth magnet face opposite magnetic poles of the first coil;
  • the movable seat is provided with a second coil on the other side opposite to the first coil, and the shell corresponding to the second coil is provided with an upper and lower opposite
  • the fifth magnet and the sixth magnet are arranged so that the fifth magnet and the sixth magnet face opposite magnetic poles of the second coil.
  • the angle between the plane where the deformation support part is located and the image sensor is less than 20 degrees.
  • the deformation support part is composed of two or more layers of deformation support part units, and a gap is provided between adjacent deformation support part units.
  • the support connection part includes at least one connection surface with a vertical angle of less than 30 degrees to the lens axis.
  • the supporting connection part includes at least one connection surface with a total area larger than half of the image sensor.
  • the core-moving autofocus camera module of the present invention electrically connects the circuit board through the mounting base.
  • the driving mechanism drives the movable base to drive the image sensor to move relative to the lens, and the position sensor It is used to detect the displacement of the image sensor to achieve automatic focusing.
  • the image sensor corresponds to the through hole in the middle of the deformation support part.
  • the support connection part of the circuit board is located in the space around the image sensor, so the overall structure is compact and takes up little space. When the main body of the circuit board moves up, the support connection part moves up with the main body of the circuit board, and the deformation support part deforms upward.
  • the deformation support part recovers to provide a downward restoring force for the support connection part; when the main body of the circuit board moves down, The support connection part moves downward with the main body of the circuit board, and at the same time, the deformed support part recovers to provide an upward restoring force for the support connection part; when the camera module is not working, the restoring force will reset the movable seat to reduce external vibration. Cause the movable seat to hit other parts and make abnormal noise.
  • the circuit board main body moves up and down, because the deformation support portion exerts a small moment on the center of the circuit board main body, the circuit board main body is less likely to tilt and the positioning is accurate.
  • the support connection part and the deformation support part in the circuit board effectively increase the effective heat dissipation area of the image sensor, improve the heat dissipation efficiency, and reduce the temperature and noise of the image sensor.
  • Figure 1 is a schematic three-dimensional structural diagram of a core-driven autofocus camera module of the present invention.
  • FIG. 2 is a schematic three-dimensional structural diagram of a core-driven autofocus camera module according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural diagram of the driving mechanism of a core-driven autofocus camera module according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic cross-sectional structural diagram of a core-driven autofocus camera module according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic cross-sectional structural diagram of a core-driven autofocus camera module according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of the driving mechanism of a core-driven autofocus camera module according to the second embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a circuit board of a core-driven autofocus camera module according to the present invention.
  • FIG. 8 is a schematic structural diagram of a circuit board of a core-type autofocus camera module according to the present invention when the deformation support portion is composed of two layers.
  • FIG. 9 is an enlarged structure of position A in FIG. 8 .
  • a core-driven autofocus camera module includes a housing 10, a lens 11 located on the housing, a circuit board 20 located in the housing, and a corresponding lens located on the circuit board.
  • the image sensor 30 is provided.
  • the circuit board 20 includes a circuit board main body 21.
  • the image sensor is located on the circuit board main body.
  • the housing 10 includes a housing 101 and a movable seat 102.
  • the movable seat slides along the axial direction of the lens and is provided in the housing.
  • the circuit The main body of the board is installed on the movable seat.
  • the camera module also includes a driving mechanism 40 that drives the movable seat to move relative to the lens.
  • the movable seat is also provided with a position sensor 50 for detecting the displacement of the image sensor.
  • the circuit board 20 also includes a circuit
  • the support connection part 22 connected to the circuit board body moves up and down along with the circuit board body, the flexible deformation support part 23 connected to the support connection part, and the mounting base 24 connected to the deformation support part.
  • the middle part of the deformation support part 23 corresponds to the image sensor device.
  • the mounting base is electrically connected to the main body of the circuit board, and the mounting base is installed in the housing.
  • the circuit board is electrically connected through the mounting base.
  • the driving mechanism drives the movable base to drive the image sensor to move relative to the lens.
  • the position sensor is used to detect the displacement of the image sensor to achieve automatic focusing.
  • the image sensor corresponds to the through hole in the middle of the deformation support part.
  • the supporting connection part of the circuit board is located in the space around the image sensor, so that the overall structure is compact and takes up little space.
  • the deformation support part recovers to provide a downward restoring force for the support connection part; when the main body of the circuit board moves down, The support connection part moves downward with the main body of the circuit board, and at the same time, the deformed support part recovers to provide an upward restoring force for the support connection part; when the camera module is not working, the restoring force will reset the movable seat to reduce external vibration. Cause the movable seat to hit other parts and make abnormal noise.
  • the circuit board main body moves up and down, because the deformation support portion exerts a small moment on the center of the circuit board main body, the circuit board main body is less likely to tilt and the positioning is accurate.
  • the support connection part and the deformation support part in the circuit board effectively increase the effective heat dissipation area of the image sensor, improve the heat dissipation efficiency, and reduce the temperature and noise of the image sensor.
  • the outer shell adopts a dark coating to improve the efficiency of absorbing thermal radiation and further reduce the temperature and noise of the image sensor.
  • the housing is provided with a lens, a circuit board, an image sensor, a driving mechanism and a position sensor.
  • a lens a circuit board
  • an image sensor a driving mechanism and a position sensor.
  • more than two lenses can be provided on the housing, and each lens is provided with a movable seat, a circuit board, an image sensor, a driving mechanism and a position sensor. This enables multi-lens autofocus.
  • the driving mechanism 40 is a voice coil motor driving mechanism.
  • the first coil 41 of the voice coil motor driving mechanism is installed on the movable seat, and the first magnet 42 of the voice coil motor is installed on the housing. Changing the current of the first coil can change the electromagnetic force and direction of the first coil, driving the movable seat to drive the image sensor to move relative to the lens to achieve an automatic focusing effect.
  • other types of driving mechanisms can be used, such as spring-type voice coil motors, memory metal motors and piezoelectric motors, instead of ball-type voice coil motors; other numbers of magnets, coils and shell designs are also used in the present invention. within the scope of protection.
  • one side of the movable seat is rollingly connected to the shell through balls 60.
  • the side of the movable seat corresponding to the balls is provided with a magnetic seat 70, and the side of the shell corresponding to the balls is provided with a magnetic seat that is attracted to the magnetic seat.
  • the second magnet and the magnetic base are attracted to each other, which can press the movable base and the housing on the balls, restricting the movable base from moving along the lens axis, and making it less likely to shift.
  • the magnetic seat is made of magnetic material and can be attracted by magnets.
  • the first coil is disposed on the other side of the movable seat adjacent to the magnetic conductive seat, and the first magnet is disposed corresponding to the first coil.
  • the first magnet 42 adopts single-sided bipolar magnetization.
  • the upper side of the first magnet facing the coil is the north pole, and the lower side of the first magnet facing the coil is the south pole.
  • the first coil is disposed on the other side of the movable seat adjacent to the magnetic conductive seat, and the first magnet is disposed corresponding to the first coil.
  • the first magnet 42 includes a third magnet 421 and a third magnet 421 arranged oppositely up and down.
  • Four magnets 422, the third magnet and the fourth magnet face opposite magnetic poles of the first coil;
  • the movable seat is provided with a second coil 43 on the other side opposite to the first coil, and the shell corresponding to the second coil is provided with oppositely arranged up and down
  • the fifth magnet 44 and the sixth magnet 45 face opposite magnetic poles of the second coil.
  • the position sensor 50 can measure the position of the first coil relative to the third magnet and the fourth magnet, and adjust the current of the first coil and the second coil to achieve a closed-loop control effect.
  • the position sensor integrated in the driver chip and the driver chip integrated in the position sensor are both within the scope of protection.
  • the angle between the plane where the deformation support part is located and the image sensor is 0 degrees.
  • the upper and lower spring constants are the smallest and the power consumption is the smallest.
  • the angle between the plane where the deformation support part is located and the image sensor is less than 20 degrees. If the angle is too large, the upper and lower spring constants will be too large and the power consumption will be too high.
  • the support connection part 22 includes at least one connection surface parallel to the lens axis.
  • the deformation support part may include at least one connecting surface with a vertical angle of less than 30 degrees to the lens axis. This allows the image sensor to move along the axis of the lens without tilting and positioning accurately without affecting camera imaging.
  • the support connection part includes at least one connection surface with a total area larger than half of the image sensor.
  • the metal part in the support connection part is connected to the image sensor, which can effectively conduct heat from the image sensor to the support connection. part, and then transferred to the outer casing through thermal radiation and thermal convection, effectively reducing the temperature and noise of the image sensor.
  • the deformation support part 23 is composed of two or more layers of deformation support part units 232, and a gap 233 is provided between adjacent deformation support part units. This layered design can reduce the thickness of the deformation support part alone, effectively reduce the spring constant in the optical axis displacement direction of the deformation support part, and reduce the power consumption required for autofocus.
  • the deformation support part is electrically connected to the main body of the circuit board.
  • the deformation support part 23 includes an annular frame with a notch 234, and the image sensor is arranged corresponding to the middle part of the annular frame; both ends of the notch of the annular frame are respectively bent.
  • the flexible connecting portion 25 is electrically connected to the mounting base.
  • the flexible connection part causes the deformation support part to deform evenly, making the deformation support part deform more stably.
  • the image sensor is set corresponding to the middle of the annular frame.
  • the annular frame is set around the image sensor.
  • the annular frame has a certain degree of elasticity. While satisfying elastic deformation, it has a compact structure and takes up less space. Small.
  • the deformation support part can be a Flexible Printed Circuit (FPC) flexible circuit board. Easy to manufacture and low cost.
  • FPC Flexible Printed Circuit
  • connection between the annular frame and the supporting connection part is a straight edge
  • the notched annular frame is a notched rectangular annular frame, which facilitates manufacturing and reduces the cost.
  • the notched annular frame may also be a notched elliptical annular frame, a notched polygonal annular frame, or a notched special-shaped annular frame.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lens Barrels (AREA)

Abstract

La présente invention concerne un module de caméra autofocus de type à cœur, qui résout des problèmes tels que les cartes de circuits imprimés souples des caméras autofocus de type à cœur existantes qui se déplacent facilement, occupent un grand espace et ont une mauvaise dissipation de la chaleur. Le module comprend un boîtier, une lentille disposée sur le boîtier, une carte de circuit imprimé disposée dans le boîtier, un capteur d'image, un capteur de position et un mécanisme d'entraînement. Lors de l'utilisation, le capteur de position est utilisé pour détecter le déplacement du capteur d'image de façon à mettre en œuvre une mise au point automatique. Lorsqu'un corps de carte de circuit imprimé se déplace vers le haut, une partie de support de déformation est restaurée pour fournir une force de rappel vers le bas pour une partie de connexion de support. Lorsque le corps de carte de circuit imprimé se déplace vers le bas, la partie de support de déformation est restaurée pour fournir une force de rappel vers le haut pour la partie de connexion de support. Lorsque le module de caméra ne fonctionne pas, la force de rappel réinitialise un siège mobile pour réduire l'impact du siège mobile sur d'autres composants et un son anormal provoqué par des vibrations externes. De plus, lorsque le corps de carte de circuit imprimé se déplace vers le haut et vers le bas, celui-ci n'est pas sujet à l'inclinaison, le positionnement est précis, et l'espace occupé est petit. En outre, l'efficacité de dissipation de chaleur du capteur d'image est augmentée.
PCT/CN2022/123736 2022-08-20 2022-10-08 Module de caméra à mise au point automatique de type à noyau entraîné WO2024040692A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211001951.1A CN115242955A (zh) 2022-08-20 2022-08-20 一种芯动式自动对焦相机模组
CN202211001951.1 2022-08-20

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WO2024040692A1 true WO2024040692A1 (fr) 2024-02-29

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WO (1) WO2024040692A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116300267A (zh) * 2023-01-03 2023-06-23 高瞻创新科技有限公司 一种对焦结构及其摄像装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120120506A1 (en) * 2010-11-12 2012-05-17 Samsung Electro-Mechanics Co., Ltd. Lens actuator and camera module having the same
CN213880010U (zh) * 2021-01-22 2021-08-03 维沃移动通信有限公司 一种摄像头及具有其的电子产品
CN114666467A (zh) * 2020-12-23 2022-06-24 维沃移动通信有限公司 摄像组件和电子设备
CN114666468A (zh) * 2020-12-23 2022-06-24 维沃移动通信有限公司 摄像组件和电子设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120120506A1 (en) * 2010-11-12 2012-05-17 Samsung Electro-Mechanics Co., Ltd. Lens actuator and camera module having the same
CN114666467A (zh) * 2020-12-23 2022-06-24 维沃移动通信有限公司 摄像组件和电子设备
CN114666468A (zh) * 2020-12-23 2022-06-24 维沃移动通信有限公司 摄像组件和电子设备
CN213880010U (zh) * 2021-01-22 2021-08-03 维沃移动通信有限公司 一种摄像头及具有其的电子产品

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