CN211481353U

CN211481353U - Automatic focusing camera module

Info

Publication number: CN211481353U
Application number: CN202020277895.4U
Authority: CN
Inventors: 王钊迎
Original assignee: Truly Opto Electronics Ltd
Current assignee: Truly Opto Electronics Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-09-11
Anticipated expiration: 2030-03-09

Abstract

The utility model discloses an automatic focusing camera module, which comprises a shell, a PCB board, a motor and a lens, wherein the motor and the lens are arranged in the shell; the motor comprises a lens carrying seat, a coil wound on the lens carrying seat and a driving motor magnet fixed on the inner wall of the shell; the PCB is provided with a magnetic sensor; a position magnet is arranged on the lens and moves up and down along with the lens; the magnetic sensor is matched with the system magnet and used for sensing the change of the magnetic field when the position magnet moves up and down along with the lens. The utility model discloses a magnetic sensor is used for responding to the change of magnetic field when the position magnetite removes, can confirm whether the camera lens has arrived the target position when focusing in view of the above, realizes the closed loop function; this application is fixed the position magnetite on the camera lens, and because of the camera lens carries the position adjustable of seat for the camera lens, so the position magnetite just can be adjusted with magnetic sensor position on the PCB board in the lump to avoid sensitization chip circuit and other components and parts positions, realize nimble overall arrangement.

Description

Automatic focusing camera module

Technical Field

The utility model relates to a technical field makes a video recording, especially relates to an automatic focusing camera module.

Background

Autofocus is often applied to an image pickup apparatus such as a single lens reflex apparatus that has a high demand for image quality. At present, people have higher and higher requirements on the camera function of electronic equipment such as a mobile phone, and the conventional automatic focusing closed-loop motor has a complex structure. How to improve the automatic focusing function is one of the technical problems to be solved at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at above problem, provide an improved auto focus camera module.

The embodiment of the utility model provides an automatic focusing camera module, including shell, PCB board, motor and camera lens that set up in the shell; the motor comprises a lens carrying seat, a coil wound on the lens carrying seat and a driving motor magnet fixed on the inner wall of the shell;

the PCB is provided with a magnetic sensor; a position magnet is arranged on the lens and moves up and down along with the lens; the magnetic sensor is matched with the system magnet and used for sensing the change of the magnetic field when the position magnet moves up and down along with the lens.

Preferably, the position magnet is provided on an outer wall of the lens.

Preferably, the lens is mounted on a lens holder, and the lens has a 360 ° rotatable angle with respect to the lens holder.

Preferably, the lens is mounted on a lens holder, and the lens has an adjustable height with respect to the lens holder.

Preferably, the position magnet is embedded on the outer wall of the lens through an integral injection molding process.

Preferably, the plurality of position magnets are uniformly fixed on the outer wall of the lens.

Preferably, the automatic focusing camera module further comprises a Driver IC; the Driver IC converts the electric signal of the received magnetic sensor into lens position data, analyzes and judges whether the target position is reached or not, and controls the motion of the motor.

Preferably, the housing is a metal housing that is processed by demagnetization.

Preferably, the magnetic sensor is a TMR magnetic sensor.

Preferably, the TMR magnetic sensor is provided on a PCB board.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a be provided with the position magnetite on the camera lens, set up the magnetic sensor on the PCB board and be used for responding to the change of magnetic field when the position magnetite removes, whether the camera lens has arrived the target position in the time of can confirming focusing in view of the above, realize the closed loop function;

this application fixes the position magnetite on the lens, when loading the camera lens into the camera lens and carrying the seat, because the camera lens carries the position of seat adjustable for the camera lens, so the position magnetite just can be adjusted with magnetic sensor position on the PCB board together to avoid sensitization chip circuit and other components and parts positions, realize nimble overall arrangement.

If the position magnet and the position of the magnetic sensor on the PCB are relatively fixed, the position of the magnetic sensor is collided by the circuit of the photosensitive chip on the PCB or the positions of other components, so that the circuit layout design module needs to be adjusted for many times.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an auto-focusing camera module according to an embodiment of the present invention;

fig. 2 is a top view of an auto-focus camera module according to an embodiment of the present invention.

Reference numerals:

10 case, 21 lens carrier, 22-driving motor magnet, 30 lens, 40 position magnet, 50PCB board, 60 magnetic sensor, 70Driver IC, 80-base, 90-magnet position range section.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The structure and action of the present invention will be further explained with reference to the accompanying drawings and embodiments:

as shown in FIGS. 1-2, an embodiment of the present invention provides an auto-focusing camera module,

including a housing 10, a PCB board 50, a motor disposed within the housing 10, and a lens 30.

As shown in fig. 1, the motor according to the embodiment of the present invention is a voice coil motor, and includes a lens holder 21, a coil wound around the lens holder 21, and a driving motor magnet 22 fixed to an inner wall of the housing 10. The lens mount 21 has a housing for housing the lens 30.

The energized conductor generates motion in the magnetic field. The driving motor magnet 22 generates a magnetic field, and when a certain amount of current is introduced into the coil 5, the lens 30 carrier wound with the coil will carry the lens 30 to operate in the magnetic field generated by the driving motor magnet 22, so as to realize the function of automatic focusing. The voice coil motor further comprises an upper spring plate and a lower spring plate.

In the auto-focusing camera module of the present application, a position magnet 40 is further provided on the lens 30. When the lens 30 moves up and down, the magnet 40 moves up and down with the lens 30. Meanwhile, a magnetic sensor 60 is provided on the PCB board 50. The magnetic sensor 60 is paired with a system magnet for sensing a change in magnetic field when the position magnet 40 moves up and down with the lens 30.

The utility model discloses a be provided with position magnetite 40 on camera lens 30, set up the change in magnetic field when magnetic sensor 60 is used for the movement of induction position magnetite 40 on PCB board 50, whether camera lens 30 has arrived the target location when focusing in view of the above, realize the closed loop function.

In the present application, the position magnet 40 is fixed on the lens 30, and when the lens 30 is mounted in the lens holder 21, since the position of the lens 30 relative to the lens holder 21 is adjustable, the position magnet 40 can be adjusted together with the position of the magnetic sensor 60 on the PCB 50 to avoid the positions of the photosensitive chip circuit and other components, thereby realizing flexible layout. Conversely, if the position magnet 40 and the magnetic sensor 60 on the PCB 50 are fixed relative to each other, the position of the magnetic sensor 60 may be interfered by the photo sensor chip circuit on the PCB or other components, which results in the need to adjust the circuit layout design module many times.

More specifically, the position magnet 40 according to the embodiment of the present application is disposed on the outer wall of the lens 30.

When the lens 30 is a screw lens 30, the lens 30 is screwed to the lens holder 21, and the specific position of the position magnet 40 is preferably in a non-threaded region below the outer wall of the lens 30. When the lens 30 is a non-threaded lens 30, the specific location of the location magnet 40 may have more space to locate.

The lens 30 of the present embodiment is assembled on the lens holder 21, wherein the lens 30 has a 360 ° rotatable angle relative to the lens holder 21. Due to the flexibility brought by the assembly of the lens 30, the position magnet 40 has a rotating space in a plane, and can realize 360-degree rotation to realize angle change.

The lens 30 of the present embodiment is assembled on the lens holder 21, wherein the lens 30 has an adjustable height relative to the lens holder 21. The position magnets 40 are also adjustable in height due to the flexibility of the lens 30 assembly.

Still further, the lens 30 has a 360 ° rotatable angle with respect to the lens holder 21, and the lens 30 has an adjustable height with respect to the lens holder 21. The position magnet 40 can be flexibly adjusted by matching the position of the magnetic sensor 60 on the PCB, and the magnetic field induction of the position magnet and the magnetic sensor is considered.

The increase of the position magnets 40 changes the weight distribution of the lens 30, which may result in an increase in the motor dynamic tilt.

The number of the position magnets 40 may be 1 or more. When the number of the position magnets 40 is 1, the weight of the lens 30 is not uniform due to a single magnet, so that the movement is not uniform when the motor is driven, and the focusing is not uniform. In order to avoid the above problems, when the outer wall of the lens 30 needs to be designed, weight distribution adjustment is well made; or the center of gravity is adjusted by the lens holder 21, and accordingly, the orientation of the lens 30 is fixed.

Preferably, the plurality of position magnets 40 are uniformly fixed to the outer wall of the lens 30 along the central axis of the lens 30. In a specific embodiment, as shown in fig. 2, the number of the position magnets 40 is 2, and the position magnets are symmetrically distributed on the lens 30, so that the center of gravity of the lens 30 is located on the central axis, and thus, it is not necessary to additionally adjust the weight distribution of the entire lens 30. The range indicated by the two broken lines on the left and right in fig. 2 is a range section 90 of 2 magnet positions.

The position magnet 40 may be fixed to the lens 30 in various ways, for example, the position magnet 40 is embedded on the outer wall of the lens 30 by an integral injection molding process.

The magnetic sensor 60 of the present application can take various forms, such as an AMR element, a GMR element, or a TMR magnetic sensor 60. Preferably, the magnetic sensor 60 is a TMR magnetic sensor 60. TMR (Tunneling magnetoresistive effect).

The TMR magnetic sensor 60 is a sensor that uses the change of magnetic field to induce the magnetoresistance change, and by analyzing the change of current/voltage caused by the resistance change of the TMR magnetic sensor 60, the change of external magnetic field can be measured to measure the movement of the lens 30.

In the embodiment of the present application, the camera module further includes a base 80 (holder), as shown in fig. 1.

The auto-focus camera module further comprises a Driver IC 70 (drive IC). The Driver IC 70 converts the electric signal received from the magnetic sensor 60 into position data of the lens 30, analyzes and determines whether or not the target position is reached, and controls the movement of the motor.

The control method comprises the following steps:

firstly, the camera is lightened, and a focusing function is started;

the Driver IC 70 drives the motor to move, and the motor drives the lens 30 to move;

when the position magnet 40 moves along with the lens 30, the position magnet 40 changes relative to the magnetic field of the magnetic sensor 60;

the magnetic sensor 60 is influenced by the change of the magnetic field, the internal resistance changes, and the output electric signal fluctuates along with the fluctuation;

the Driver IC 70 receives the electric signal, calculates the position (moving height) of the lens 30, determines whether or not the target position is reached, and drives the motor to move, thereby realizing a closed-loop function.

The housing 10 is generally made of metal, has weak magnetism, and has a problem of attraction with the position magnet 40. In order to avoid the magnet 40 from attracting the motor iron shell and affecting the motor movement. In one embodiment, the primary area of influence of the housing 10 that attracts the position magnets 40 may be cut away to reduce this. In another embodiment, the housing 10 may be degaussed; the demagnetized metal shell 10 can ensure the structural integrity of the motor shell 10, so as to prevent dust from entering the interior of the motor to affect the image picture.

The TMR magnetic sensor 60 of the present application is electrically connected to the PCB board 50, and preferably, the TMR magnetic sensor 60 is provided on the PCB board 50 to reduce additional intermediate line connection members.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic focusing camera module comprises a shell, a PCB, a motor and a lens, wherein the motor and the lens are arranged in the shell; the motor comprises a lens carrying seat, a coil wound on the lens carrying seat and a driving motor magnet fixed on the inner wall of the shell; it is characterized in that the preparation method is characterized in that,

2. The auto-focus camera module according to claim 1, wherein the position magnet is disposed on an outer wall of the lens.

3. The auto-focus camera module of claim 2, wherein the lens is assembled on a lens holder, and the lens has a 360 ° rotational angle with respect to the lens holder.

4. The auto-focus camera module of claim 2, wherein the lens is mounted on a lens holder, and the lens has an adjustable height relative to the lens holder.

5. The auto-focus camera module according to claim 2, wherein the position magnet is embedded on the outer wall of the lens through an integral injection molding process.

6. The auto-focus camera module according to claim 2, wherein the plurality of position magnets are uniformly fixed on the outer wall of the lens.

7. The autofocus camera module of claim 1, further comprising a driver IC; the drive IC converts the electric signal received from the magnetic sensor into lens position data, analyzes and determines whether the target position is reached, and controls the movement of the motor.

8. The autofocus camera module of claim 1, wherein the housing is a metal housing that is degaussed.

9. The auto-focus camera module according to claim 1, wherein the magnetic sensor is a TMR magnetic sensor.

10. The auto-focus camera module of claim 9, wherein the TMR magnetic sensor is disposed on a PCB board.