CN218456463U

CN218456463U - Core-moving type automatic focusing camera module

Info

Publication number: CN218456463U
Application number: CN202222194325.0U
Authority: CN
Inventors: 麦练智
Original assignee: Vista Innotech Ltd
Current assignee: Vista Innotech Ltd
Priority date: 2022-08-20
Filing date: 2022-08-20
Publication date: 2023-02-07
Anticipated expiration: 2032-08-20

Abstract

The utility model relates to a core dynamic formula auto focus camera module takes place the skew easily when the flexible circuit board of solving current core dynamic formula auto focus camera removes, and occupation space is big, the not good problem of heat dissipation, the big problem of occupation space. The automatic focusing device comprises a shell, a lens arranged on the shell, a circuit board arranged in the shell, an image sensor, a position sensor and a driving mechanism, wherein when the automatic focusing device is used, the position sensor is used for detecting the displacement of the image sensor so as to realize automatic focusing; when the circuit board main body moves upwards, the deformation supporting part is restored to support the connecting part to provide downward restoring force; when the circuit board main body moves downwards, the deformation supporting part is restored to support the connecting part to provide an upward restoring force, and when the camera module does not work, the restoring force can restore the movable seat, so that the impact of the movable seat on other parts and abnormal sound caused by external vibration are reduced; in addition, the circuit board main body is not easy to incline when moving up and down, the positioning is accurate, and the occupied space is small. And also improves the heat dissipation efficiency of the image sensor.

Description

Core-moving type automatic focusing camera module

Technical Field

The utility model relates to a core dynamic formula auto focus camera module.

Background

The core-moving actuator is theoretically more advantageous in terms of power consumption and size, but the actuator technology has more disadvantages, resulting in failure of this type of technology to become mainstream. The actuators (refer to patent nos.: CN113325543A, CN214959775U and CN 112684565A) and their applied camera module require a flexible circuit board to connect the image sensor in the movable structure and the electronic parts outside the fixed structure, provide power to the image sensor and send image signals to the electronic parts. The flexible circuit board can adopt a planar deformation design (refer to patents CN113325543A and CN 214959775U) or a multi-fold deformation design (refer to patent CN 112684565A). No matter the design of plane or multiple folding deformation is adopted, the deformed part of the flexible circuit board also needs to occupy more space, and occupies the space outside the camera module, below or beside the image sensor. In addition, the multi-folding deformation design has a complex production process, which is not favorable for production cost and yield.

In addition, the core-moving actuator is designed as a spring (see patent nos.: CN113325543A and CN 214959775U), and still requires a large current and electromagnetic force to resist the force caused by the deformation of the spring when the lens is still motionless, resulting in large power consumption. On the other hand, the elastic sheet type design is sensitive to the size and assembly errors of the flexible circuit board, and unnecessary inclination of the image sensor in the automatic process is easy to occur, so that the resolution of the image edge is influenced. In addition, the magnets in some core-moving actuators (refer to patent No. CN 112684565A) are movable, and when other magnets are in the vicinity of the actuator, the magnets are easily interfered, which may cause serious magnetic interference and affect the normal operation of the actuator.

Finally, since the image sensor in the actuator needs to move during the auto-focusing process, the circuit board below the image sensor cannot be tightly attached to the housing, which affects the heat dissipation effect. The design of the actuator or camera module does not provide an effective heat dissipation path in a limited space. Poor heat dissipation can result in higher image sensor temperatures, which can cause more image noise and even failure to function properly.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the flexible circuit board of the automatic focusing camera of the existing core moving type is easy to deviate, occupies a large space and has poor heat dissipation.

For solving the utility model provides a technical scheme that technical problem adopted does: the utility model discloses a heart dynamic formula auto focus camera module includes the casing, locates the camera lens on the casing, locates the circuit board in the casing to and locate the image sensor that the corresponding camera lens on the circuit board set up, the circuit board including the circuit board main part, image sensor be located the circuit board main part, the casing include the shell, and the sliding seat, the sliding seat slide along the camera lens axial and locate in the shell, the circuit board main part install on the sliding seat, camera module still include the actuating mechanism that drives the relative camera lens motion of sliding seat, the sliding seat on still be equipped with the position sensor who is used for detecting image sensor's displacement, the circuit board still include with the circuit board main part be connected along with the support connecting portion that the circuit board main part reciprocated, the flexible deformation supporting part who is connected with the support connecting portion, and the mount pad of being connected with the deformation supporting part, deformation supporting part middle part correspond image sensor and be equipped with the through-hole, the minimum distance of deformation supporting part place to image sensor be greater than one tenth of corresponding camera lens height in the plane; the mounting seat is electrically connected with the circuit board main body and is mounted in the shell.

Right the utility model discloses do further limited technical scheme and include:

the shell is provided with more than two lenses, and each lens is correspondingly 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, a first coil of the voice coil motor driving mechanism is installed on the movable seat, and a first magnet of the voice coil motor is installed on the shell.

One side of the movable seat is in rolling connection with the shell through a ball, one side of the movable seat, corresponding to the ball, is provided with a magnetic conduction seat, and one side of the shell, corresponding to the ball, is provided with a second magnet which is adsorbed to the magnetic conduction seat.

The first coil is arranged on the other side, adjacent to the magnetic conduction seat, of the movable seat, the first magnet is arranged corresponding to the first coil, the first magnet is magnetized by adopting a single-sided double pole, the surface, facing the coil, of the upper portion of the first magnet is a north pole, and the surface, facing the coil, of the lower portion of the first magnet is a south pole.

The first coil is arranged on the other side of the movable seat adjacent to the magnetic conductive seat, the first magnet is arranged corresponding to the first coil and comprises a third magnet and a fourth magnet which are oppositely arranged up and down, and the magnetic poles of the third magnet and the fourth magnet facing the first coil are opposite; the other side of the movable seat opposite to the first coil is provided with a second coil, a shell corresponding to the second coil is provided with a fifth magnet and a sixth magnet which are arranged oppositely up and down, and the magnetic poles of the fifth magnet and the sixth magnet facing the second coil are opposite.

The included angle between the plane where the deformation supporting part is located and the image sensor is smaller than 20 degrees.

The deformation supporting part is composed of more than two layers of deformation supporting part monomers, and a gap is arranged between every two adjacent deformation supporting part monomers.

The supporting connection part comprises at least one connection surface and a vertical included angle in the axial direction of the lens is smaller than 30 degrees.

The supporting connection part comprises at least one connection surface, and the total area of the connection surface is larger than one of two parts of the image sensor.

Through the technical scheme, the beneficial effects of the utility model are that: the utility model discloses a core dynamic formula auto focus camera module makes the circuit board realize the electricity through the mount pad and connects, during the use, actuating mechanism drive sliding seat drives the relative camera lens motion of image sensor, thereby position sensor is used for detecting image sensor's displacement realization auto focus, image sensor corresponds the through-hole at deformation supporting part middle part, the support connecting portion of circuit board are located the peripheral space of image sensor to overall structure is compact, and occupation space is little. When the circuit board main body moves upwards, the support connecting part moves upwards along with the circuit board main body, the deformation supporting part deforms upwards, and meanwhile, the deformation supporting part restores to provide downward restoring force for the support connecting part; when the circuit board main body moves downwards, the support connecting part moves downwards along with the circuit board main body, and meanwhile, the deformation support part is restored to provide upward restoring force for the support connecting part; when the camera module does not work, the restoring force can reset the movable seat, and the impact of the movable seat on other parts and abnormal sound caused by external vibration are reduced. In addition, when the circuit board main body moves up and down, because the moment of the deformation supporting part to the central position of the circuit board main body is smaller, the circuit board main body is not easy to incline, and the positioning is accurate. Moreover, the effective heat dissipation area of the image sensor is effectively increased by the supporting connecting part and the deformation supporting part in the circuit board, the heat dissipation efficiency is improved, and the temperature and the noise of the image sensor are reduced.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a core-moving type auto-focusing camera module according to the present invention.

Fig. 2 is a schematic perspective view of a first embodiment of a core-moving type auto-focus camera module according to the present invention.

Fig. 3 is a schematic structural diagram of a driving mechanism according to a first embodiment of the core-driven auto-focus camera module of the present invention.

Fig. 4 is a schematic view of a sectioning structure of a core-moving type auto-focus camera module according to a first embodiment of the present invention.

Fig. 5 is a schematic sectional view of a first embodiment of the core-driven auto-focus camera module according to the present invention.

Fig. 6 is a schematic structural diagram of a driving mechanism according to a second embodiment of the core-moving type auto-focusing camera module of the present invention.

Fig. 7 is a schematic structural diagram of a circuit board of a core-moving type auto-focus camera module according to the present invention.

Fig. 8 is a schematic structural view of the circuit board of the core-moving type auto-focus camera module according to the present invention when the deformation supporting portion is two-layer.

Fig. 9 is an enlarged structure at a in fig. 8.

Detailed Description

The structure of the present invention will be further explained with reference to the accompanying drawings.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present application.

Referring to fig. 1 to 9, a core-driven auto-focusing camera module includes a housing 10, a lens 11 disposed on the housing, a circuit board 20 disposed in the housing, and an image sensor 30 disposed on the circuit board and corresponding to the lens, where the circuit board 20 includes a circuit board main body 21, the image sensor is disposed on the circuit board main body, the housing 10 includes a housing 101, and a movable seat 102, the movable seat is disposed in the housing in an axial sliding manner along the lens, the circuit board main body is mounted on the movable seat, the camera module further includes a driving mechanism 40 for driving the movable seat to move relative to the lens, the movable seat is further provided with a position sensor 50 for detecting a displacement of the image sensor, the circuit board 20 further includes a supporting connection portion 22 connected to the circuit board main body and moving up and down along with the circuit board main body, a flexible deformation support portion 23 connected to the supporting connection portion, and a mounting seat 24 connected to the deformation support portion, a through hole 231 is disposed in the middle of the deformation support portion and corresponding to the image sensor, and a minimum distance from a plane where the deformation support portion is greater than one tenth of a height of a corresponding lens. If the distance is too small, the deformed portion will be kept away from the image sensor and the peripheral electronic parts, and the space cannot be saved. The mounting seat is electrically connected with the circuit board main body and is arranged in the shell. The circuit board is electrically connected through the mounting seat, when the automatic focusing device is used, the driving mechanism drives the movable seat to drive the image sensor to move relative to the lens, the position sensor is used for detecting the displacement of the image sensor to realize automatic focusing, the image sensor corresponds to the through hole in the middle of the deformation supporting part, and the supporting connecting part of the circuit board is located in the peripheral space of the image sensor, so that the automatic focusing device is compact in overall structure and small in occupied space. When the circuit board main body moves upwards, the support connecting part moves upwards along with the circuit board main body, the deformation supporting part deforms upwards, and meanwhile, the deformation supporting part restores to provide downward restoring force for the support connecting part; when the circuit board main body moves downwards, the support connecting part moves downwards along with the circuit board main body, and meanwhile, the deformation supporting part restores to provide an upward restoring force for the support connecting part; when the camera module does not work, the restoring force can reset the movable seat, and the impact of the movable seat on other parts and abnormal sound caused by external vibration are reduced. In addition, when the circuit board main body moves up and down, because the moment of the deformation supporting part to the central position of the circuit board main body is smaller, the circuit board main body is not easy to incline, and the positioning is accurate. Moreover, the effective heat dissipation area of the image sensor is effectively increased by the supporting connecting part and the deformation supporting part in the circuit board, the heat dissipation efficiency is improved, and the temperature and the noise of the image sensor are reduced.

In the embodiment, the shell adopts the dark-color coating, so that the efficiency of absorbing heat radiation is improved, and the temperature and the noise of the image sensor are further reduced.

In this embodiment, the housing is provided with 1 lens, a circuit board, an image sensor, a driving mechanism, and a position sensor. During specific implementation, more than two lenses can be arranged on the shell, and each lens is correspondingly provided with a movable seat, a circuit board, an image sensor, a driving mechanism and a position sensor. Thereby realizing the automatic focusing of multiple lenses.

In this embodiment, the driving mechanism 40 is a voice coil motor driving mechanism, the first coil 41 of the voice coil motor driving mechanism is mounted on the movable base, and the first magnet 42 of the voice coil motor is mounted on the housing. The current of the first coil is changed, so that the electromagnetic force and the direction of the first coil can be changed, the movable seat is driven to drive the image sensor to move relative to the lens, and the automatic focusing effect is achieved. In specific implementation, other types of driving mechanisms, such as a reed-type voice coil motor, a memory metal motor, and a piezoelectric motor, may be adopted instead of the ball-type voice coil motor; it is within the scope of the present invention to use other numbers of magnets, coils, and housing designs.

In this embodiment, a side surface of the movable seat is connected to the housing through a ball 60 in a rolling manner, a magnetic conductive seat 70 is disposed on a side of the movable seat corresponding to the ball, and a second magnet 80 adsorbed to the magnetic conductive seat is disposed on a side of the housing corresponding to the ball. The second magnet and the magnetic conduction seat are mutually adsorbed, so that the movable seat and the shell can be pressed on the ball, the movable seat is limited to move along the axial direction of the lens, and the displacement is not easy to occur. The magnetic conductive seat is made of magnetic conductive materials and can be attracted by the magnet.

In the first embodiment, the first coil is disposed on the other side of the movable seat adjacent to the magnetic conductive seat, the first magnet is disposed corresponding to the first coil, the first magnet 42 is magnetized by using single-sided double poles, the surface of the upper portion of the first magnet facing the coil is a north pole, and the surface of the lower portion of the first magnet facing the coil is a south pole. When the first line is electrified, electromagnetic force approximately parallel to the optical axis can be generated to push the movable seat to drive the image sensor to move relative to the lens, so that the effect of automatic focusing is achieved.

In the second embodiment, the first coil is disposed on the other side of the movable seat adjacent to the magnetic conductive seat, the first magnet is disposed corresponding to the first coil, the first magnet 42 includes a third magnet 421 and a fourth magnet 422 which are arranged oppositely, and the magnetic poles of the third magnet and the fourth magnet facing the first coil are opposite; the other side of the movable seat opposite to the first coil is provided with a second coil 43, the shell corresponding to the second coil is provided with a fifth magnet 44 and a sixth magnet 45 which are arranged oppositely up and down, and the magnetic poles of the fifth magnet and the sixth magnet facing the second coil are opposite. When the first coil and the second coil are electrified, electromagnetic force approximately parallel to the optical axis can be generated, the movable seat is pushed to drive the image sensor to move relative to the lens, and the automatic focusing effect is achieved. 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 the effect of closed-loop control. The integration of the position sensor in the driver chip and the integration of the driver chip in the position sensor are both within the protective range.

In this embodiment, the included angle between the plane where the deformation supporting portion is located and the image sensor is 0 degree, and the spring constant up and down is the smallest at this time, and the power consumption is the smallest. The included angle between the plane where the deformation supporting part is located and the image sensor is smaller than 20 degrees. If the included angle is too large, the spring constants of the upper part and the lower part are too large, and the power consumption is too high.

In this embodiment, the supporting connection portion 22 includes at least one connection surface parallel to the axial direction of the lens. In specific implementation, the deformation supporting part may include at least one connecting surface having a vertical included angle smaller than 30 degrees with the axial direction of the lens. Therefore, the image sensor can move along the axial direction of the lens, cannot incline, is accurately positioned, and cannot influence the imaging of the camera.

In this embodiment, the support connecting portion is greater than one of image sensor's one-second including at least one connection face total area, and the metal part in the support connecting portion is connected with image sensor, can effectually conduct the heat of image sensor to the support connecting portion, and on heat radiation and the heat convection passed to the shell, effectively reduced image sensor's temperature and noise. In this embodiment, the deformation supporting portion 23 is composed of more than two layers of deformation supporting portion single bodies 232, and a gap 233 is provided between adjacent deformation supporting portion single bodies. The layered design can reduce the thickness of the deformation supporting part monomer, effectively reduce the spring constant of the displacement direction of the optical axis of the deformation supporting part, and reduce the power consumption required during automatic focusing.

In this embodiment, the deformation supporting portion is electrically connected to the circuit board main body, the deformation supporting portion 23 includes an annular frame with a notch 234, and the image sensor is disposed corresponding to the middle of the annular frame; the two ends of the gap of the annular frame are respectively electrically connected with the mounting seat through the bent flexible connecting parts 25. The flexible connecting part enables the deformation of the deformation supporting part to be uniformly carried out, so that the change of the deformation supporting part is stable. When the circuit board main body moves up and down, the image sensor is driven to move up and down, the image sensor is arranged in the middle of the corresponding annular frame, the annular frame is arranged on the periphery of the image sensor, the annular frame has certain elasticity, elastic deformation is met, the structure is compact, and the occupied space is small. The deformation supporting part may be a Flexible Printed Circuit (FPC) Flexible Circuit board. Convenient manufacture and low cost.

In the embodiment, the joint of the annular frame and the support connecting part is a straight edge, and the annular frame with the notch is a rectangular annular frame with the notch, so that the manufacturing is convenient and the cost is low. In the third specific implementation, the annular frame with the notch can also be an elliptical annular frame with the notch, a polygonal annular frame with the notch or a special-shaped annular frame with the notch.

While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be understood as limited by the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive work within the scope of the present invention as described in the claims.

Claims

1. The utility model provides a core dynamic formula auto focus camera module, camera module including the casing, locate the camera lens on the casing, locate the circuit board in the casing to and locate the image sensor that the corresponding camera lens on the circuit board set up, its characterized in that: the camera module comprises a shell and a movable seat, wherein the movable seat is arranged in the shell in a sliding manner along the axial direction of a lens, the circuit board body is arranged on the movable seat, the camera module further comprises a driving mechanism for driving the movable seat to move relative to the lens, a position sensor for detecting the displacement of the image sensor is further arranged on the movable seat, the circuit board further comprises a supporting connecting part which is connected with the circuit board body and moves up and down along with the circuit board body, a flexible deformation supporting part connected with the supporting connecting part and a mounting seat connected with the deformation supporting part, a through hole is formed in the middle of the deformation supporting part corresponding to the image sensor, and the minimum distance from the plane where the deformation supporting part is located to the image sensor is larger than one tenth of the height of the corresponding lens; the mounting seat is electrically connected with the circuit board main body and is mounted in the shell.

2. A core-actuated autofocus camera module according to claim 1, wherein: the shell is provided with more than two lenses, and each lens is correspondingly provided with a movable seat, a circuit board, an image sensor, a driving mechanism and a position sensor.

3. A core-actuated autofocus camera module according to claim 1, wherein: the driving mechanism is a voice coil motor driving mechanism, a first coil of the voice coil motor driving mechanism is installed on the movable seat, and a first magnet of the voice coil motor is installed on the shell.

4. A core-actuated autofocus camera module according to claim 3, wherein: one side of the movable seat is in rolling connection with the shell through a ball, one side of the movable seat, corresponding to the ball, is provided with a magnetic conduction seat, and one side of the shell, corresponding to the ball, is provided with a second magnet which is adsorbed to the magnetic conduction seat.

5. A core-actuated autofocus camera module according to claim 4, in which: the first coil is arranged on the other side, adjacent to the magnetic conduction seat, of the movable seat, the first magnet is arranged corresponding to the first coil, the first magnet is magnetized by adopting a single-sided double pole, the surface, facing the coil, of the upper portion of the first magnet is a north pole, and the surface, facing the coil, of the lower portion of the first magnet is a south pole.

6. A cored auto focus camera module as recited in claim 4, wherein: the first coil is arranged on the other side of the movable seat adjacent to the magnetic conduction seat, the first magnet is arranged corresponding to the first coil and comprises a third magnet and a fourth magnet which are oppositely arranged up and down, and the magnetic poles of the third magnet and the fourth magnet facing the first coil are opposite; the other side of the movable seat relative to the first coil is provided with a second coil, a shell corresponding to the second coil is provided with a fifth magnet and a sixth magnet which are arranged oppositely up and down, and the magnetic poles of the fifth magnet and the sixth magnet facing the second coil are opposite.

7. A core-actuated autofocus camera module according to any of claims 1 to 6, wherein: the included angle between the plane where the deformation supporting part is located and the image sensor is smaller than 20 degrees.

8. A core-actuated autofocus camera module according to any of claims 1 to 6, wherein: the deformation supporting part is composed of more than two layers of deformation supporting part monomers, and a gap is arranged between every two adjacent deformation supporting part monomers.

9. A core-actuated autofocus camera module according to any of claims 1 to 6, wherein: the supporting connection part comprises at least one connection surface and a vertical included angle in the axial direction of the lens is smaller than 30 degrees.

10. A core-actuated autofocus camera module according to any of claims 1 to 6, wherein: the supporting connection part comprises at least one connection surface, and the total area of the connection surface is larger than one of two parts of the image sensor.