CN114577099A - Position detection system, lens, zooming method and terminal - Google Patents

Abstract

The application discloses a position detection system, a lens, a zooming method and a terminal, comprising: the Hall sensor is used for detecting the position of the magnet on the lens carrier; the magnet is a cuboid, the thickness direction of the magnet is a direction from one pole of the magnet to the other pole of the magnet, and the length direction of the magnet is a direction perpendicular to the thickness direction; the Hall sensor is arranged outside the magnet and used for collecting the magnetic induction intensity change of the magnet when the magnet translates along the direction with the length direction of the first included angle so as to detect the position of the lens carrier. The magnet is translated along a certain angle with the length direction, so that the stroke range of the Hall sensor in the magnet translation process, which is uniform in magnetic induction intensity, is enlarged, the linear variation interval of the magnetic induction intensity relative to the magnet stroke is effectively increased, and the precision of lens carrier position detection is improved.

Description

Position detection system, lens, zoom method and terminal

technical field

The present application relates to the technical field of optical imaging equipment, and in particular, to a position detection system, a lens, a zooming method, and a terminal.

Background technique

The continuous optical zoom of the lens requires a motor that achieves high-precision positioning with a large stroke (generally at least 2 mm). In the existing motor closed-loop feedback control lens, the magnet installed on the lens carrier moves horizontally relative to the Hall sensor. And the moving direction of the magnet is from one pole of the magnet to the other pole. During the movement, the magnetic flux density of the magnetic field at the position of the Hall sensor changes greatly, resulting in a linear change interval of the magnet stroke that the Hall sensor can sense. It is only 500 to 600 microns. After exceeding this range, the magnetic induction intensity becomes non-linear, resulting in the obtained stroke data is also non-linear with respect to the magnetic induction intensity. Due to the low detection accuracy of the magnet position in the non-linear range, accurate detection can be achieved. The zoom stroke is limited to a linear change interval, and the linear change interval of the stroke data relative to the magnetic induction intensity is relatively short, which cannot meet the travel requirements of the lens for continuous optical zoom.

The preceding statements are intended to provide general background information and do not necessarily constitute prior art.

SUMMARY OF THE INVENTION

In view of this, the present application provides a position detection system, a lens, a zooming method and a terminal to solve the problem that the linear variation interval of the relative magnetic induction intensity of the current travel data is relatively short.

In a first aspect, a position detection system provided by this application includes:

Magnets for setting on the lens carrier, and Hall sensors;

The magnet is a cuboid, the thickness direction of the magnet is a direction from one pole of the magnet to the other pole, and the length direction of the magnet is a direction perpendicular to the thickness direction;

The Hall sensor is arranged outside the magnet, and is used for collecting the change of the magnetic induction intensity when the magnet is translated along the direction forming a first included angle with the length direction, so as to detect the position of the lens carrier.

Optionally, the width direction of the magnet is a direction perpendicular to the length direction and the thickness direction, respectively, and when the magnet is at the initial position, the orthographic projection of the Hall sensor along the width direction of the magnet falls on the magnet. on the magnet.

Optionally, the Hall sensor includes two, the projections of the two Hall sensors on the magnet are mirror-symmetrical, and the axis of symmetry is perpendicular to the translation direction of the magnet.

Optionally, the position detection system further includes a Hall voltage calculation circuit, and the Hall voltage calculation circuit includes an operator, an analog-to-digital converter, and two voltage acquisition modules;

The output ends of the two voltage acquisition modules are respectively connected with the input ends of the arithmetic unit, and the two voltage acquisition modules are respectively used to acquire the Hall voltage collected by the corresponding Hall sensor, and the arithmetic unit is used to obtain the Hall voltage collected by the corresponding Hall sensor. Calculate the target Hall voltage from the Hall voltages output by the two voltage acquisition modules;

The output terminal of the arithmetic unit is connected to the input terminal of the analog-to-digital converter, and the analog-to-digital converter is used for converting the target Hall voltage output by the arithmetic unit into Hall voltage data and outputting the data.

Optionally, each of the voltage acquisition modules includes a Hall sensor and an operational amplifier, the positive and negative input ends of the Hall sensor are respectively connected to positive and negative driving voltages, and the two output ends of the Hall sensor are respectively Connect the positive and negative input terminals of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the operational unit as the output terminal of the voltage acquisition module, and the operational amplifier is used to connect to the Hall sensor output by the Hall sensor. After performing operational amplification, the amplified Hall voltage is output to the operator, and the operator is used to calculate the target Hall voltage according to the two connected amplified Hall voltages.

Optionally, the operator calculates the target Hall voltage according to the following formula:

Wherein, U ₀ is the target Hall voltage, and U ₁ and U ₂ are respectively the Hall voltages output by the two voltage acquisition modules.

In a second aspect, the present application provides a lens, including:

A lens carrier, a motor, and the position detection system according to any one of the first aspects above, the lens carrier is connected to a magnet, the motor is used to drive the lens carrier to drive the magnet to translate and zoom, and the Hall The sensor is used to collect the magnetic induction intensity of the magnet

In a third aspect, the present application provides a zoom method of a lens, the lens includes a lens carrier, a motor, a magnet arranged on the lens carrier, and a Hall sensor, and the zoom method of the lens includes:

Controlling the motor to drive the lens carrier to drive the magnet to translate along the direction of the first included angle with the length direction of the magnet;

Obtain the target magnetic induction intensity when the Hall sensor collects the magnet translation;

The position of the lens carrier is determined according to the target magnetic induction intensity, and when the lens carrier is at the target position, the motor is controlled to stop working to complete the zooming.

Optionally, the Hall sensor includes two, and the acquiring the target magnetic induction intensity when the Hall sensor collects the magnet translation includes:

acquiring the first magnetic induction intensity and the second magnetic induction intensity collected by the two Hall sensors;

The target magnetic induction intensity is calculated according to the first magnetic induction intensity and the second magnetic induction intensity.

Optionally, the calculating the target magnetic induction intensity according to the first magnetic induction intensity and the second magnetic induction intensity includes: calculating the target magnetic induction intensity according to the following formula:

Wherein, H is the target magnetic induction intensity, P ₁ is the first target magnetic induction intensity, and M ₁ is the second target magnetic induction intensity.

In a fourth aspect, the present application provides a terminal, including: a terminal body, and the lens according to the second aspect.

In the above position detection system, lens, zoom method and terminal of the present application, the direction in which one pole of the magnet points to the other pole is taken as the thickness direction, and the direction perpendicular to the thickness direction is taken as the length direction, and the magnetic field strength at various places along the length direction of the magnet is relatively high. Evenly, the Hall sensor is set to collect the change of the magnetic induction intensity when the magnet is translated along the direction of the first included angle with the length direction. It can be understood that the translation direction of the magnet is at a certain angle with the length direction of the magnet. Since the magnet is a cuboid, the inclination is certain. After the angle, the effective length of the magnet in the translation direction can be increased from the long side to the diagonal, and when the magnet is translated, the magnetic induction intensity collected by the Hall sensor will change. By translating the magnet at a certain angle to the length direction, the range of the uniform magnetic induction intensity of the Hall sensor position during the magnet translation process is increased, and the linear variation range of the magnetic induction intensity relative to the magnet stroke is effectively increased, which improves the accuracy of the lens. The accuracy of carrier position detection.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a position detection system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a double Hall structure of a position detection system provided by an embodiment of the present application;

3 is a schematic diagram of the relationship between the magnetic induction intensity and the magnet stroke provided by the embodiment of the present application;

FIG. 4 is a schematic diagram of a C ₁ linear interval provided by an embodiment of the present application;

5 is a schematic diagram of another relationship between the magnetic induction intensity and the magnet stroke provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of a linear interval of (P ₁ +M ₁ )/(P ₁ −M ₁ ) provided in an embodiment of the present application;

7 is a schematic structural diagram of a Hall voltage calculation circuit provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a basic flow of a zooming method provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. In the case of no conflict, the following various embodiments and their technical features can be combined with each other.

A first aspect of the present application provides a position detection system, as shown in FIG. 1 , which includes: a magnet 11 arranged on a lens carrier, and a Hall sensor 21 . The magnet 11 is a rectangular parallelepiped. In this embodiment, the direction in which one pole of the magnet 11 points to the other is the thickness direction of the magnet 11, and the direction perpendicular to the thickness direction is the length direction of the magnet 11. The magnet 11 can be used together with the lens carrier. The translation is performed along a direction that forms a first included angle θ with the length direction of the magnet 11 . The Hall sensor 21 is arranged outside the magnet 11, and is used to collect the magnetic induction intensity when the magnet 11 translates along the direction of the first included angle θ with the length direction (hereinafter referred to as the translation direction of the magnet 11), and detects the magnetic induction intensity of the lens carrier through the magnetic induction intensity. Location.

Specifically, when the magnet 11 is at the initial position, the line connecting the geometric center of the sensing part of the Hall sensor 21 and the geometric center of the magnet 11 is perpendicular to the length direction of the magnet 11, and the translation of the lens carrier drives the magnet 11 to translate. The translation process The middle Hall sensor collects the corresponding magnetic induction intensity, and compares it with the relationship between the magnetic induction intensity collected in advance and the stroke of the magnet 11 to determine the stroke position of the magnet 11, thereby realizing the position detection of the lens carrier.

Taking a specific embodiment as an example, using a single Hall sensor, the length direction of the magnet 11 is 3 mm (millimeters), the thickness direction is 1 mm, and the first angle θ between the length direction and the translation direction of the magnet 11 is 1 degree, the distance between the Hall sensor and the magnet 11 is 0.5mm, and the relationship between the stroke of the magnet 11 and the magnetic induction intensity collected by the Hall sensor 21 during the translation process is measured as shown in _C1 of Figure 3, where the vertical axis represents the Hall The magnetic induction intensity collected by the sensor, the unit is mT (millitesla), the horizontal axis represents the stroke of the magnet 11, the unit is mm, the origin means that the magnetic induction intensity collected when the magnet 11 is at the initial position is 0, in this embodiment , the positive and negative values of the magnetic induction intensity indicate the direction of the magnetic induction intensity, and the positive and negative values of the stroke of the magnet 11 indicate the displacement stroke of the magnet 11 in the positive and negative directions relative to the initial position. The content represented by the coordinates is the same as that in FIG. 3 , and will not be repeated in the following.

It can be seen from Figure 3 that within a certain range, the magnetic induction intensity C ₁ collected by the Hall sensor C and the stroke of the magnet 11 are close to a linear relationship, and the linear range is extracted to obtain the relationship diagram shown in Figure 4, Within the stroke range of plus or minus 1 mm of the magnet 11, the magnetic induction intensity C ₁ and the stroke of the magnet 11 are close to a linear relationship. Therefore, the magnetic induction intensity C ₁ collected by the Hall sensor C in this interval can determine the stroke of the magnet 11, thereby determining The position of the lens carrier. In this embodiment, parameters such as the size of the magnet 11, the size of the first included angle θ, and the distance between the Hall sensor 21 and the magnet 11 are a specific application example used in the experiment to explain the solution of the present application more clearly. , which does not limit the scope of protection of this application.

In the above embodiment, the direction in which one pole of the magnet 11 points to the other is taken as the thickness direction, and the direction perpendicular to the thickness direction is taken as the length direction. The magnetic induction intensity changes when the magnet 11 is translated along the direction of the first included angle θ with the length direction. It can be understood that the translation direction of the magnet 11 is at a certain angle with the length direction of the magnet 11. Since the magnet 11 is a cuboid, after a certain angle of inclination The effective length of the magnet 11 in the translation direction can be increased from the long side to the diagonal, and when the magnet 11 is translated, the magnetic induction intensity collected by the Hall sensor 21 will change. By translating the magnet 11 at a certain angle to the length direction, the range of the uniform magnetic induction intensity of the Hall sensor 21 during the translation process of the magnet 11 is increased, and the linear variation range of the magnetic induction intensity relative to the stroke of the magnet 11 is effectively increased. Improved accuracy of lens carrier position detection.

In some embodiments, the width direction of the magnet 11 is perpendicular to the length direction and the thickness direction respectively. As shown in FIG. 1 , when the magnet 11 is at the initial position, the orthographic projection of the Hall sensor along the width direction of the magnet 11 falls on on magnet 11.

In some embodiments, as shown in FIG. 2 , there are two Hall sensors 21 , which are denoted as Hall sensor P and Hall sensor M respectively for the convenience of description. The two Hall sensors 21 are arranged along the translation direction of the magnet 11 . , when the magnet 11 is at the initial position, the projections of the two Hall sensors 21 on the magnet 11 are _mirror - _symmetrical . During the movement of the magnet 11, the target magnetic induction intensity is calculated by the magnetic induction intensity collected by the two Hall sensors 21, and then the stroke of the magnet 11 is determined according to the target magnetic induction intensity, thereby determining the position of the lens carrier. Specifically, the target magnetic induction intensity is calculated by the following formula:

Wherein, H is the magnetic induction intensity of the target, and P ₁ and M ₁ respectively represent the magnetic induction intensity collected by the two Hall sensors.

In a specific embodiment, two Hall sensors 21 are used, the length direction of the magnet 11 is 3 mm, the thickness direction is 1 mm, and the first angle θ between the length direction and the translation direction of the magnet 11 is 1 degree , the distance between the Hall sensor 21 and the magnet 11 is 0.5mm, and the distance between the two Hall sensors 21 is 2.5mm. The relationship between the stroke of the magnet 11 during the translation process and the magnetic induction intensity collected by the two Hall sensors 21 is as follows: As shown by P ₁ and M ₁ in FIG. 3 , the relationship between the target magnetic induction intensity calculated by the above method and the stroke of the magnet 11 is shown as (P ₁ +M ₁ )/(P ₁ -M ₁ ) in FIG. 5 , extracting In the linear interval, the relationship between the target magnetic induction intensity and the stroke of the magnet 11 as shown in FIG. 6 can be obtained. It can be seen that in the stroke of the magnet 11, (P ₁ +M ₁ )/(P ₁ -M ₁ ) Compared with the single Hall sensor scheme, the magnification of the magnetic induction intensity of the dual Hall sensor scheme is about H/C _{1 =} 35, that is, the change of the magnetic induction intensity is more obvious and the accuracy is better. high.

By arranging two Hall sensors, the magnetic induction intensity of the target can be effectively amplified, thereby improving the accuracy of the magnetic induction intensity and detecting the position of the lens carrier more accurately.

In some embodiments, when there are two Hall sensors 21 , since the magnetic induction intensity at the position of the Hall sensors 21 has a linear relationship with the Hall voltage collected by the Hall sensors 21 , the two Hall sensors 21 can be used first. The Hall voltage is calculated to obtain the target Hall voltage, so as to calculate the target magnetic induction intensity.

Specifically, the detection system also includes a Hall voltage calculation circuit. As shown in FIG. 7 , the Hall voltage calculation circuit includes an operator, an analog-to-digital converter, and two voltage acquisition modules; the output ends of the two voltage acquisition modules are respectively connected with the calculation The two voltage acquisition modules are respectively used to acquire the Hall voltage collected by the corresponding Hall sensor, and the operator is used to calculate the target Hall voltage according to the Hall voltage output by the two voltage acquisition modules; The output terminal is connected with the input terminal of the analog-to-digital converter, and the analog-to-digital converter is used for converting the target Hall voltage output by the operator into Hall voltage data and outputting it. The target magnetic induction intensity is calculated according to the output Hall voltage data, and the stroke of the magnet 11 is determined, thereby detecting the position of the lens carrier.

In some embodiments, the operator calculates the target Hall voltage according to the following formula:

Among them, U ₀ is the target Hall voltage, and U ₁ and U ₂ are the Hall voltages output by the two voltage acquisition modules, respectively.

In some embodiments, as shown in FIG. 7 , each voltage acquisition module includes a Hall sensor and an operational amplifier, the positive and negative input ends of the Hall sensor are respectively connected to the positive and negative driving voltages, and the two outputs of the Hall sensor The terminals are respectively connected to the positive and negative input terminals of the operational amplifier. The output terminal of the operational amplifier is used as the output terminal of the voltage acquisition module to connect to the input terminal of the operator. The operational amplifier is used to connect to the Hall voltage output by the Hall sensor, and output after operational amplification. The amplified Hall voltage is sent to the operator, and the operator is used to calculate the target Hall voltage according to the connected two amplified Hall voltages.

In other embodiments, the length direction dimension of the magnet 11 is 2.5-3.5mm, the thickness direction dimension is 0.8-1mm, the first included angle θ between the length direction and the translation direction of the magnet 11 is 0.8-1.5 degree, The distance between the Hall sensor and the magnet 11 is 0.2-0.5mm.

In some embodiments, when two Hall sensors 21 are provided, the distance between the two Hall sensors is 2-3 mm, and is not larger than the lengthwise dimension of the magnet 11 .

Based on the same inventive concept, a second aspect of the present application provides a lens, comprising: a lens carrier, a motor, and the position detection system according to any one of the above-mentioned first aspects, wherein the lens carrier is connected to the magnet 11, so The motor is used to drive the lens carrier to drive the magnet 11 to translate and zoom, and the Hall sensor 21 is used to collect the magnetic induction intensity of the magnet 11 .

Based on the same inventive concept, a third aspect of the present application provides a method for zooming a lens. The lens includes a lens carrier, a motor, a magnet arranged on the lens carrier, and a Hall sensor. As shown in FIG. 8 , the lens The zoom methods include:

S1100, controlling the motor to drive the lens carrier to drive the magnet to translate in a direction that forms a first included angle with the length direction of the magnet;

When zooming is required, the processor determines the target position of the zoomed lens carrier to be achieved, and controls the motor to drive the lens carrier to translate according to the target position and the current position of the lens carrier. The translation direction of the lens is parallel to the optical axis of the lens. The lens carrier is connected with the magnet. When the lens carrier translates, it drives the magnet to translate together. The direction of the lens translation is consistent with the direction of the magnet translation, that is, the direction of the first angle θ with the length direction of the magnet.

S1200, acquiring the target magnetic induction intensity when the Hall sensor collects the magnet translation;

The hall sensor is arranged outside the magnet, and when the magnet and the lens carrier are in the initial position, the orthographic projection of the hall sensor along the width direction of the magnet falls on the magnet. In the process that the lens carrier drives the magnet to translate, the Hall sensor collects the target magnetic induction intensity of the magnet in real time. When there is one Hall sensor, the target magnetic induction intensity is the magnetic induction intensity collected by the Hall sensor.

S1300. Determine the position of the lens carrier according to the target magnetic induction intensity, and when the lens carrier is at the target position, control the motor to stop working to complete zooming.

A mapping relationship between the target magnetic induction intensity and the magnet stroke is set in the system. After the target magnetic induction intensity is obtained, the stroke of the magnet is determined according to the target magnetic induction intensity, thereby determining the position of the lens carrier. When it is monitored that the lens carrier is at the target position, the processor controls the motor to stop working, so that the lens carrier is temporarily fixed at the target position to complete the zooming.

In a specific embodiment, a single Hall sensor is used, denoted as Hall sensor C, the length direction of the magnet is 3mm (millimeters), the thickness direction is 1mm, and the first dimension between the length direction and the translation direction of the magnet is The included angle θ is 1 degree, and the distance between the Hall sensor and the magnet is 0.5mm. The relationship between the travel of the magnet and the magnetic induction intensity collected by the Hall sensor C during the translation process of the magnet is measured as shown in _C1 of Figure 3, and the linear interval is extracted. , the relationship diagram shown in Figure 4 is obtained. It can be seen that the magnetic induction intensity and the stroke of the magnet are close to a linear relationship within the stroke range of plus or minus 1 mm. Therefore, the magnetic induction intensity collected by the Hall sensor C in this interval is It is possible to determine the travel of the magnet and thus the position of the lens carrier.

In some embodiments, as shown in FIG. 2 , two Hall sensors are used, which are denoted as Hall sensor P and Hall sensor M respectively. The two Hall sensors are arranged along the translation direction of the magnet. When the magnet is in the initial position , the projections of the two Hall sensors on the magnet are mirror-symmetrical, and the symmetry axis passes through the geometric center of the magnet and is perpendicular to the translation direction of the magnet, that is, L _P =L _M . The S1200, acquiring the target magnetic induction intensity when the Hall sensor collects the magnet translation, specifically includes:

S1210, acquiring the first magnetic induction intensity and the second magnetic induction intensity collected by the two Hall sensors;

The first magnetic induction intensity and the second magnetic induction intensity collected by the two Hall sensors are acquired, which are respectively counted as P ₁ and M ₁ .

S1220. Calculate the target magnetic induction intensity according to the first magnetic induction intensity and the second magnetic induction intensity.

The target magnetic induction intensity is calculated through the magnetic induction intensity collected by the two Hall sensors, and then the stroke of the magnet is determined according to the target magnetic induction intensity, thereby determining the position of the lens carrier. Specifically, the target magnetic induction intensity is calculated by the following formula:

Wherein, H is the target magnetic induction intensity, P ₁ is the first magnetic induction intensity, and M ₁ is the second magnetic induction intensity.

In a specific embodiment, two Hall sensors are used, the length of the magnet is 3 mm, the thickness of the magnet is 1 mm, the first angle θ between the length of the magnet and the translation direction is 1 degree, the Hall The distance between the sensor and the magnet is 0.5mm, and the distance between the two Hall sensors is 2.5mm. The relationship between the stroke during the magnet translation process and the magnetic induction intensity collected by the two Hall sensors is shown in Figure 3. P ₁ and M As shown in Figure ₁ , the relationship between the target magnetic induction intensity and the magnet stroke calculated by the above method is shown in (P ₁ +M ₁ )/(P ₁ -M ₁ ) in Figure 5, and the linear interval is extracted, and the figure can be obtained. 6 shows the relationship between the target magnetic induction intensity and the magnet stroke, it can be seen that in the stroke of the magnet, the change value of (P ₁ +M ₁ )/(P ₁ -M ₁ ) is much larger than the change value of C1, that is, The change of magnetic induction intensity is more obvious and the precision is higher.

Based on the same inventive concept, a fourth aspect of the present application provides a terminal, including a terminal body, and the lens as described in the second aspect above. The lens is disposed on the terminal, and the terminal controls the lens to zoom or collect image data.

While the application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and the accompanying drawings. This application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular with respect to the various functions performed by the above-described components, the terms used to describe such components are intended to correspond to any component that performs the specified function of the component (eg, which is functionally equivalent) (eg, which is functionally equivalent) (unless otherwise indicated) , even if it is not structurally equivalent to the disclosed structure that performs the functions of the exemplary implementations of the specification shown herein.

That is, the above descriptions are only the embodiments of the present application, which are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, such as the technical features between the embodiments Combining with each other, or directly or indirectly used in other related technical fields, are also included in the scope of patent protection of this application.

In addition, in the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front" , "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and other indicated orientation or positional relationships are based on the drawings The orientation or positional relationship is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the application . In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals to identify them. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any one embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The above description is presented in the present application to enable any person skilled in the art to make and use the present application. In the above description, various details are set forth for the purpose of explanation. It is to be understood that one of ordinary skill in the art can realize that the present application may be practiced without the use of these specific details. In other instances, well-known structures and procedures have not been described in detail so as not to obscure the description of the present application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims (11)

1. a position detection system, is characterized in that, comprises: Magnets for setting on the lens carrier, and Hall sensors; The magnet is a cuboid, the thickness direction of the magnet is a direction from one pole of the magnet to the other pole, and the length direction of the magnet is a direction perpendicular to the thickness direction; The Hall sensor is arranged outside the magnet, and is used for collecting the change of the magnetic induction intensity when the magnet is translated along the direction forming a first included angle with the length direction, so as to detect the position of the lens carrier. 2 . The position detection system according to claim 1 , wherein the width direction of the magnet is a direction perpendicular to the length direction and the thickness direction respectively, and when the magnet is at an initial position, the Hall sensor An orthographic projection in the width direction of the magnet falls on the magnet. 3 . The position detection system according to claim 2 , wherein the Hall sensor comprises two, the projections of the two Hall sensors on the magnet are mirror-symmetrical, and the axis of symmetry is perpendicular to the magnet. 4 . translation direction. 4. The position detection system according to claim 3, wherein the position detection system further comprises a Hall voltage calculation circuit, and the Hall voltage calculation circuit comprises an arithmetic unit, an analog-to-digital converter and two voltage acquisitions module; The output ends of the two voltage acquisition modules are respectively connected with the input ends of the arithmetic unit, and the two voltage acquisition modules are respectively used to acquire the Hall voltage collected by the corresponding Hall sensor, and the arithmetic unit is used to obtain the Hall voltage collected by the corresponding Hall sensor. Calculate the target Hall voltage from the Hall voltages output by the two voltage acquisition modules; The output terminal of the arithmetic unit is connected to the input terminal of the analog-to-digital converter, and the analog-to-digital converter is used for converting the target Hall voltage output by the arithmetic unit into Hall voltage data and outputting the data. 5 . The position detection system according to claim 4 , wherein each of the voltage acquisition modules comprises a Hall sensor and an operational amplifier, and the positive and negative input ends of the Hall sensor are respectively connected to positive and negative drives. 6 . voltage, the two output ends of the Hall sensor are respectively connected to the positive and negative input ends of the operational amplifier, and the output end of the operational amplifier is connected to the input end of the operator as the output end of the voltage acquisition module, and the operation The amplifier is used to access the Hall voltage output by the Hall sensor, and after performing operational amplification, the amplified Hall voltage is output to the operator, and the operator is used to access the two amplified Hall voltages according to the Calculate the target Hall voltage. 6. The position detection system according to claim 4, wherein the operator calculates the target Hall voltage according to the following formula:

Wherein, U ₀ is the target Hall voltage, and U ₁ and U ₂ are respectively the Hall voltages output by the two voltage acquisition modules. 7. A lens, characterized in that, comprising: A lens carrier, a motor, and the position detection system according to any one of claims 1 to 6, wherein the lens carrier is connected with a magnet, and the motor is used to drive the lens carrier to drive the magnet to translate and zoom, and the magnet The Er sensor is used to collect the magnetic induction intensity of the magnet. 8. A zooming method for a lens, wherein the lens comprises a lens carrier, a motor, a magnet arranged on the lens carrier, and a Hall sensor, and the zooming method for the lens comprises: Controlling the motor to drive the lens carrier to drive the magnet to translate along the direction of the first included angle with the length direction of the magnet; Obtain the target magnetic induction intensity when the Hall sensor collects the magnet translation; The position of the lens carrier is determined according to the target magnetic induction intensity, and when the lens carrier is at the target position, the motor is controlled to stop working to complete the zooming. 9. The zoom method according to claim 8, wherein the Hall sensor comprises two, and the acquiring the target magnetic induction intensity when the Hall sensor collects the magnet translation comprises: acquiring the first magnetic induction intensity and the second magnetic induction intensity collected by the two Hall sensors; The target magnetic induction intensity is calculated according to the first magnetic induction intensity and the second magnetic induction intensity. 10. The zoom method according to claim 9, wherein the calculating the target magnetic induction intensity according to the first magnetic induction intensity and the second magnetic induction intensity comprises: calculating the target magnetic induction intensity according to the following formula:

Wherein, H is the target magnetic induction intensity, P ₁ is the first target magnetic induction intensity, and M ₁ is the second target magnetic induction intensity. 11. A terminal, comprising a terminal body and the lens of claim 7.

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