CN114577099A - Position detection system, lens, zooming method and terminal - Google Patents
Position detection system, lens, zooming method and terminal Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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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
Technical Field
The application relates to the technical field of optical imaging equipment, in particular to a position detection system, a lens, a zooming method and a terminal.
Background
In the existing motor closed loop feedback control lens, a magnet arranged on a lens carrier moves horizontally relative to a Hall sensor, the moving direction of the magnet is the direction from one pole of the magnet to the other pole, the magnetic field magnetic flux density at the position of the Hall sensor changes greatly in the moving process, so that the linear change interval of the magnet stroke which can be sensed by the Hall sensor is only 500-600 micrometers, after the linear change interval is exceeded, the magnetic induction intensity changes nonlinearly, so that the obtained stroke data is also nonlinear relative to the magnetic induction intensity change, because the detection precision of the nonlinear interval on the position of the magnet is low, the accurate stroke can be limited in the linear change interval, and the zooming stroke data is shorter relative to the linear change interval of the magnetic induction intensity, the stroke requirement of the continuous optical zooming of the lens cannot be met.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
In view of this, the present application provides a position detection system, a lens, a zooming method and a terminal, so as to solve the problem that the linear variation interval of the conventional stroke data relative to the magnetic induction intensity is relatively short.
In a first aspect, the present application provides a position detection system, including:
a magnet for being disposed on the lens carrier, and a hall sensor;
the magnet is a cuboid, the thickness direction of the magnet is the direction from one pole of the magnet to the other pole of the magnet, and the length direction of the magnet is the direction vertical 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.
Optionally, the width direction of the magnet is perpendicular to the length direction and the thickness direction, and when the magnet is located at the initial position, the orthogonal projection of the hall sensor along the width direction of the magnet falls on the magnet.
Optionally, the number of the hall sensors is two, projections of the two hall sensors on the magnet are in mirror symmetry, and a symmetry axis is perpendicular to a translation direction of the magnet.
Optionally, the position detection system further includes a hall voltage calculation circuit, where 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 end of the arithmetic unit, the two voltage acquisition modules are respectively used for acquiring Hall voltages acquired by corresponding Hall sensors, and the arithmetic unit is used for calculating a target Hall voltage according to the Hall voltages output by the two voltage acquisition modules;
the output end of the arithmetic unit is connected with the input end 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 Hall voltage data.
Optionally, each voltage acquisition module includes a hall sensor and an operational amplifier, positive and negative input ends of the hall sensor are respectively connected to positive and negative driving voltages, two output ends of the hall sensor are respectively connected to positive and negative input ends of the operational amplifier, an output end of the operational amplifier is used as an output end of the voltage acquisition module to be connected to an input end of the operator, the operational amplifier is used for accessing the hall voltage output by the hall sensor, outputting the amplified hall voltage to the operator after operational amplification, and the operator is used for calculating a target hall voltage according to the accessed two amplified hall voltages.
Optionally, the arithmetic unit calculates the target hall voltage according to the following formula:
wherein, U0Is a target Hall voltage, U1And U2The two voltage acquisition modules respectively output Hall voltages.
In a second aspect, the present application provides a lens barrel, comprising:
the lens carrier is connected with a magnet, the motor is used for driving the lens carrier to drive the magnet to translate for zooming, and the Hall sensor is used for acquiring the magnetic induction intensity of the magnet
In a third aspect, the present application provides a method for zooming a lens, where the lens includes a lens carrier, a motor, a magnet disposed on the lens carrier, and a hall sensor, and the method includes:
controlling a motor to drive a lens carrier to drive a magnet to translate along a direction forming a first included angle with the length direction of the magnet;
acquiring target magnetic induction intensity of a Hall sensor during magnet translation;
and determining the position of the lens carrier according to the target magnetic induction, and controlling a motor to stop working when the lens carrier is positioned at the target position to finish zooming.
Optionally, the hall sensor includes two, obtain the target magnetic induction when hall sensor gathers magnet translation, include:
acquiring a first magnetic induction intensity and a second magnetic induction intensity acquired by the two Hall sensors;
and calculating the target magnetic induction according to the first magnetic induction and the second magnetic induction.
Optionally, the calculating the target magnetic induction according to the first magnetic induction and the second magnetic induction includes: calculating the target magnetic induction according to the following formula:
wherein H is the target magnetic induction, P1For the first target magnetic induction, M1And the second target magnetic induction is obtained.
In a fourth aspect, the present application provides a terminal, comprising: comprising a terminal body and a lens as described in the second aspect above.
The utility model provides an above-mentioned position detecting system, the camera lens, zoom method and terminal, regard the direction of the directional another utmost point of a utmost point of magnet as the thickness direction, regard as length direction with thickness direction vertically direction, magnet length direction goes up everywhere magnetic field intensity is comparatively even, set up the magnetic induction intensity change when hall sensor gathers magnet along the direction translation that is first contained angle with length direction, it can be understood, the translation direction and the magnet length direction of magnet are certain angle, because magnet is the cuboid, can make magnet increase by the long limit to be the diagonal after the certain angle of slope, and the meeting of the magnetic induction intensity that hall sensor gathered when magnet translation can produce the change. 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.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a position detection system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a dual hall structure of a position detection system according to an embodiment of the present disclosure;
FIG. 3 is a graph illustrating magnetic induction versus magnet travel according to an embodiment of the present application;
FIG. 4 is a drawing showing a schematic diagram of a process C according to an embodiment of the present application1A schematic of the linear interval;
FIG. 5 is a schematic diagram illustrating an alternative relationship between magnetic induction and magnet travel according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an embodiment of the present application (P)1+M1)/(P1-M1) A schematic diagram of the linear interval of (a);
fig. 7 is a schematic structural diagram of a hall voltage calculating circuit provided in the embodiment of the present application;
fig. 8 is a basic flowchart of a zooming method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The following embodiments and their technical features may be combined with each other without conflict.
In a first aspect of the present application, there is provided a position detecting system, as shown in fig. 1, including: a magnet 11 for being arranged on the lens carrier, and a hall sensor 21. The magnet 11 is a rectangular parallelepiped, in this embodiment, a direction in which one pole of the magnet 11 is directed to the other pole is a thickness direction of the magnet 11, a direction perpendicular to the thickness direction is a longitudinal direction of the magnet 11, and the magnet 11 is translatable together with the lens carrier in a direction forming a first angle θ with the longitudinal direction of the magnet 11. The hall sensor 21 is disposed outside the magnet 11, and is configured to collect magnetic induction intensity when the magnet 11 translates along a direction (hereinafter, referred to as a translation direction of the magnet 11) having a first included angle θ with the length direction, and detect the position of the lens carrier through the magnetic induction intensity.
Specifically, when the magnet 11 is located at the initial position, a connecting line between 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, the magnet 11 is driven to translate through translation of the lens carrier, the hall sensor acquires corresponding magnetic induction intensity in the translation process, the magnetic induction intensity is compared with the relation between the magnetic induction intensity acquired in advance and the stroke of the magnet 11, the stroke position of the magnet 11 is determined, and therefore position detection of the lens carrier is achieved.
Taking a specific embodiment as an example, useA single hall sensor, the length direction dimension of the magnet 11 is 3mm (millimeter), the thickness direction dimension is 1mm, the first included angle θ between the length direction of the magnet 11 and the translation direction is 1 degree, the distance between the hall sensor and the magnet 11 is 0.5mm, and the relationship between the stroke in the translation process of the magnet 11 and the magnetic induction intensity collected by the hall sensor 21 is measured as C in fig. 31In the embodiment, positive and negative values of the magnetic induction indicate the direction of the magnetic induction, and positive and negative values of the stroke of the magnet 11 indicate the displacement stroke of the magnet 11 relative to the positive and negative directions of the initial position, and the contents indicated by the horizontal and vertical coordinates of the coordinate systems shown in fig. 4, 5, and 6 in the present application are the same as those in fig. 3, and will not be described again in detail later.
As can be seen from fig. 3, the magnetic induction C collected by the hall sensor C is within a certain range1The magnetic induction intensity C in the stroke range of plus or minus 1mm of the magnet 11 is obtained as shown in the relation graph of FIG. 4 by extracting the linear section from the linear relation with the stroke of the magnet 111The magnetic induction C detected by the hall sensor C in this interval is nearly linear with the stroke of the magnet 111The stroke of the magnet 11 and thus the position of the lens carrier can be determined. In the present 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 adopted in the experiment, which is used to explain the scheme of the present application more clearly, and the scope of protection of the present application is not limited.
Above-mentioned embodiment is through regarding the direction of the directional another utmost point of a utmost point with magnet 11 as the thickness direction, regard as length direction with the perpendicular direction of thickness direction, magnet 11 length direction is last magnetic field intensity everywhere comparatively even, it changes to set up the magnetic induction when hall sensor 21 gathers magnet 11 along the direction translation that is first contained angle theta with length direction, it can be understood that, magnet 11's translation direction is certain angle with magnet 11 length direction, because magnet 11 is the cuboid, can make magnet 11 increase for the diagonal by the long limit in the effective length in translation direction after the certain angle of slope, and the magnetic induction that hall sensor 21 gathered when magnet 11 translation can produce the change. Through being certain angle with length direction with magnet 11 along translating, increased the even stroke scope of magnetic induction intensity of 11 translation in-process hall sensor 21 positions of magnet, effectively increased the linear change interval of the relative magnet 11 stroke of magnetic induction intensity, improved the precision to 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, and when the magnet 11 is located at the initial position, as shown in fig. 1, the orthographic projection of the hall sensor along the width direction of the magnet 11 falls on the magnet 11.
In some embodiments, as shown in fig. 2, the hall sensors 21 include two hall sensors P and M, which are respectively identified as the hall sensor P and the hall sensor M for convenience of description, the two hall sensors 21 are disposed along the translation direction of the magnet 11, when the magnet 11 is at the initial position, the projection images of the two hall sensors 21 on the magnet 11 are symmetrical, the symmetry axis passes through the geometric center of the magnet 11, and is perpendicular to the translation direction of the magnet 11, i.e., LP＝LM. In the moving process of the magnet 11, the target magnetic induction is calculated through the magnetic induction collected by the two hall sensors 21, and then the stroke of the magnet 11 is determined according to the target magnetic induction, so that the position of the lens carrier is determined. Specifically, the target magnetic induction is calculated by the following formula:
wherein H is the target magnetic induction, P1And M1Respectively showing the magnetic induction intensity collected by the two Hall sensors.
In a specific embodiment, two hall sensors 21 are used, the magnet 11 having a length dimension of 3mm, a thickness dimension of 1mm, and a first dimension between the length and translation of the magnet 11The included angle theta is 1 degree, the distance between the Hall sensor 21 and the magnet 11 is 0.5mm, the distance between the two Hall sensors 21 is 2.5mm, and the relation between the travel of the magnet 11 in the translation process and the magnetic induction intensity acquired by the two Hall sensors 21 is measured as P in the graph 31And M1The relationship between the target magnetic induction and the stroke of the magnet 11 calculated by the above method is shown in fig. 5 (P)1+M1)/(P1-M1) By extracting the linear interval, the relationship between the target magnetic induction and the stroke of the magnet 11 as shown in fig. 6 can be obtained, and it can be seen that (P) is present in the stroke of the magnet 111+M1)/(P1-M1) Is much larger than C1The magnetic induction intensity of the double Hall sensor scheme is amplified by about H/C compared with the single Hall sensor scheme135, the change of the magnetic induction intensity is more obvious, and the precision is higher.
Through setting up two hall sensor, can effectively enlarge target magnetic induction intensity to improve magnetic induction intensity's precision, it is more accurate to the position detection of lens carrier.
In some embodiments, when there are two hall sensors 21, since the magnetic induction intensity at the position of the hall sensor 21 and the hall voltage collected by the hall sensor 21 have a linear relationship, the target hall voltage can be obtained by calculating the hall voltages of the two hall sensors 21, so as to calculate the target magnetic induction intensity.
Specifically, the detection system further 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 input end of the arithmetic unit, the two voltage acquisition modules are respectively used for acquiring the Hall voltage acquired by the corresponding Hall sensor, and the arithmetic unit is used for calculating the target Hall voltage according to the Hall voltage output by the two voltage acquisition modules; the output end of the arithmetic unit is connected with the input end 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 Hall voltage data. And calculating the target magnetic induction according to the output Hall voltage data, and determining the stroke of the magnet 11 so as to detect the position of the lens carrier.
In some embodiments, the operator calculates the target hall voltage according to the following formula:
wherein, U0Is a target Hall voltage, U1And U2The two voltage acquisition modules respectively output Hall voltages.
In some embodiments, as shown in fig. 7, each voltage obtaining module includes a hall sensor and an operational amplifier, positive and negative input terminals of the hall sensor are respectively connected to positive and negative driving voltages, two output terminals of the hall sensor are respectively connected to positive and negative input terminals of the operational amplifier, an output terminal of the operational amplifier is used as an output terminal of the voltage obtaining module and is connected to an input terminal of the operator, the operational amplifier is configured to access the hall voltage output by the hall sensor, perform operational amplification and output the amplified hall voltage to the operator, and the operator is configured to calculate the target hall voltage according to the accessed two amplified hall voltages.
In other embodiments, the magnet 11 has a length dimension of 2.5-3.5mm, a thickness dimension of 0.8-1mm, a first angle θ between the length dimension of the magnet 11 and the translation direction of 0.8-1.5 degrees, and a distance between the hall sensor and the magnet 11 of 0.2-0.5 mm.
In some embodiments, when two hall sensors 21 are provided, the distance between the two hall sensors is 2 to 3mm and is not greater than the lengthwise dimension of the magnet 11.
Based on the same inventive concept, in a second aspect of the present application, there is provided a lens barrel including: the lens carrier is connected with the magnet 11, the motor is used for driving the lens carrier to drive the magnet 11 to translate and zoom, and the hall sensor 21 is used for acquiring the magnetic induction intensity of the magnet 11.
Based on the same inventive concept, in a third aspect of the present application, there is provided a zoom method of a lens including a lens carrier, a motor, a magnet disposed on the lens carrier, and a hall sensor, as shown in fig. 8, the zoom method of the lens including:
s1100, controlling a motor to drive a lens carrier to drive a magnet to translate along a direction forming a first included angle with the length direction of the magnet;
when zooming is needed, the processor determines a target position of a zoomed lens carrier to be reached, the motor is controlled 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, the magnet is driven to translate together when the lens carrier translates, and the translation direction of the lens is consistent with the translation direction of the magnet, namely the direction of a first included angle theta is formed between the translation direction of the lens and the length direction of the magnet.
S1200, acquiring the target magnetic induction intensity of the Hall sensor during magnet translation;
the Hall sensor is arranged outside the magnet, and when the magnet and the lens carrier are located at initial positions, 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 move horizontally, the Hall sensor collects the target magnetic induction intensity of the magnet in real time, and when the Hall sensor is one, the target magnetic induction intensity is the magnetic induction intensity collected by the Hall sensor.
S1300, determining the position of the lens carrier according to the target magnetic induction intensity, and controlling a motor to stop working to finish zooming when the lens carrier is located at the target position.
The system is provided with a mapping relation between target magnetic induction and magnet stroke, and after the target magnetic induction is obtained, the stroke of the magnet is determined according to the target magnetic induction, so that the position of the lens carrier is determined. When the lens carrier is monitored to be located at the target position, the processor controls the motor to stop working, so that the lens carrier is temporarily fixed at the target position, and zooming is completed.
In a particular embodimentIn the method, a single hall sensor is used and is marked as a hall sensor C, the size of the magnet in the length direction is 3mm (millimeter), the size of the magnet in the thickness direction is 1mm, a first included angle theta between the length direction of the magnet and the translation direction is 1 degree, the distance between the hall sensor and the magnet is 0.5mm, and the relation between the stroke and the magnetic induction intensity collected by the hall sensor C in the translation process of the magnet is measured as shown in C of fig. 31As shown, a linear interval is extracted to obtain a relationship diagram as shown in fig. 4, and it can be seen that the magnetic induction intensity and the stroke of the magnet are close to a linear relationship in the stroke range of plus and minus 1mm of the magnet, so that the magnetic induction intensity collected by the hall sensor C in the interval can determine the stroke of the magnet, and thus the position of the lens carrier.
In some embodiments, as shown in fig. 2, two hall sensors, referred to as hall sensor P and hall sensor M, are used, and the two hall sensors are arranged along the translation direction of the magnet, and when the magnet is at 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, i.e., LP＝LM. S1200, obtaining the target magnetic induction intensity when the Hall sensor collects the magnet to move horizontally, and specifically comprising the following steps:
s1210, acquiring first magnetic induction intensity and second magnetic induction intensity acquired by the two Hall sensors;
obtaining a first magnetic induction and a second magnetic induction which are collected by two Hall sensors and respectively counting as P1And M1。
S1220, calculating the target magnetic induction according to the first magnetic induction and the second magnetic induction.
The magnetic induction intensity of the target is calculated through the magnetic induction intensities collected by the two Hall sensors, and then the stroke of the magnet is determined according to the magnetic induction intensity of the target, so that the position of the lens carrier is determined. Specifically, the target magnetic induction is calculated by the following formula:
wherein H is the target magnetic induction, P1Is a first magnetic induction, M1The second magnetic induction is obtained.
In a specific embodiment, two hall sensors are used, the size of the magnet in the length direction is 3mm, the size of the magnet in the thickness direction is 1mm, the first included angle θ between the length direction of the magnet and the translation direction is 1 degree, the distance between the hall sensor and the magnet is 0.5mm, the distance between the two hall sensors is 2.5mm, and the relation between the travel distance of the magnet during the translation process and the magnetic induction intensity collected by the two hall sensors is measured as P in fig. 31And M1The relationship between the target magnetic induction and the magnet stroke calculated by the above method is shown in fig. 5 (P)1+M1)/(P1-M1) By extracting the linear interval, the relationship between the target magnetic induction and the magnet stroke as shown in fig. 6 can be obtained, and it can be seen that, in the magnet stroke, (P)1+M1)/(P1-M1) The variation value of (2) is far larger than that of C1, namely the variation of magnetic induction intensity is more obvious and the precision is higher.
Based on the same inventive concept, in a fourth aspect of the present application, a terminal is provided, which includes a terminal body, and the lens according to the second aspect, wherein the lens is disposed on the terminal, and the lens is controlled by the terminal to zoom or collect image data.
Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present application includes all such modifications and alterations, and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.
That is, the above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, such as mutual combination of technical features between various embodiments, or direct or indirect application to other related technical fields, are included in the scope of the present application.
In addition, in the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "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, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be considered as limiting the present application. In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make and use the present application. In the foregoing description, various details have been set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present 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, comprising:
a magnet for being disposed on the lens carrier, and a hall sensor;
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.
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 located at the initial position, an orthographic projection of the hall sensor in the width direction of the magnet falls on the magnet.
3. The position detection system according to claim 2, wherein the hall sensors comprise two, and the projections of the two hall sensors on the magnet are mirror symmetric, and the axis of symmetry is perpendicular to the translation direction of the magnet.
4. The position detection system of claim 3, further comprising a Hall voltage calculation circuit comprising 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 end of the arithmetic unit, the two voltage acquisition modules are respectively used for acquiring Hall voltages acquired by corresponding Hall sensors, and the arithmetic unit is used for calculating a target Hall voltage according to the Hall voltages output by the two voltage acquisition modules;
the output end of the arithmetic unit is connected with the input end 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 Hall voltage data.
5. The position detecting system according to claim 4, wherein each of the voltage obtaining modules includes a hall sensor and an operational amplifier, positive and negative input terminals of the hall sensor are respectively connected to positive and negative driving voltages, two output terminals of the hall sensor are respectively connected to positive and negative input terminals of the operational amplifier, an output terminal of the operational amplifier is used as an output terminal of the voltage obtaining module to be connected to an input terminal of the operational unit, the operational amplifier is used for accessing the hall voltage output by the hall sensor, performing operational amplification and outputting the amplified hall voltage to the operational unit, and the operational unit is used for calculating a target hall voltage according to the accessed two amplified hall voltages.
6. The position detection system according to claim 4, wherein the operator calculates the target hall voltage according to the following formula:
wherein, U0Is a target Hall voltage, U1And U2The two voltage acquisition modules respectively output Hall voltages.
7. A lens barrel characterized by comprising:
the lens carrier is connected with a magnet, the motor is used for driving the lens carrier to drive the magnet to translate for zooming, and the Hall sensor is used for acquiring the magnetic induction intensity of the magnet.
8. A zooming method of a lens is characterized in that the lens comprises a lens carrier, a motor, a magnet arranged on the lens carrier and a Hall sensor, and the zooming method of the lens comprises the following steps:
controlling a motor to drive a lens carrier to drive a magnet to translate along a direction forming a first included angle with the length direction of the magnet;
acquiring target magnetic induction intensity of a Hall sensor during magnet translation;
and determining the position of the lens carrier according to the target magnetic induction intensity, and controlling a motor to stop working when the lens carrier is positioned at the target position to finish zooming.
9. The zooming method of claim 8, wherein the number of the hall sensors is two, and the acquiring the target magnetic induction of the hall sensor during the magnet translation comprises:
acquiring a first magnetic induction intensity and a second magnetic induction intensity acquired by the two Hall sensors;
and calculating the target magnetic induction according to the first magnetic induction and the second magnetic induction.
10. The zooming method of claim 9, wherein said calculating the target magnetic induction from the first magnetic induction and the second magnetic induction comprises: calculating the target magnetic induction according to the following formula:
wherein H is the target magnetic induction, P1Is the first targetMagnetic induction, M1And the second target magnetic induction is obtained.
11. A terminal characterized by comprising a terminal body, and the lens according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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