CN100388038C - Diaphragm actuator and magnetic position sensing structure and setting method thereof - Google Patents

Abstract

An iris actuator includes a magnetic position sensing structure, at least one driving assembly and a shading assembly. The magnetic position sensing structure comprises a magnetic component and a magnetic sensing component which are arranged oppositely; the driving component is connected with and drives the magnetic component or the magnetic sensing component to relatively move with a rotation center, so that the distance and the included angle between the magnetic component and the magnetic sensing component are simultaneously changed, and mutual compensation is realized, so that a magnetic flux induced by the magnetic sensing component and the position of the magnetic component form a substantially linear relation; the shading component is connected with the driving component.

Description

Aperture actuator and its magnetic position sensing structure and setting method

technical field

The present invention relates to a magnetic position sensing structure and its setting method, in particular to a magnetic position sensing structure applied to an aperture actuator and its setting method.

Background technique

With the advancement of technology, the demand for image capture and image processing is increasing. Traditionally, the lens aperture (iris diaphragm) using magnets and magnetic position sensors converts the magnetic flux induced by the magnetic position sensor into a voltage output signal. Due to the structure Improper setting makes it impossible to have a linear relationship between the magnetic flux (or voltage) and the position of the magnet, so a non-linear drive device and method are required, which will result in a complex structure and increased cost; if multiple magnets are installed, they will compensate each other. The magnetic flux induced by the magnetic position sensor is adjusted to a linear relationship as much as possible. However, due to the increase in the number of components used, the structure will be complicated and the cost will be increased.

As shown in FIG. 1A and FIG. 1B, it is a conventional magnetic position sensing structure using a magnet 11 and a Hall sensor (Hallsensor) 12. When the magnet 11 advances along the moving direction, the distance d decreases, and the magnetic flux density ( magnetic flux density) increases, the relationship between the magnetic flux density and the spacing d is nonlinear.

As shown in FIG. 2A and FIG. 2B, it is another conventional magnetic position sensing structure using a magnet 11 and a Hall sensor (Hall sensor) 12. When the magnet 11 advances along the moving direction, the distance d decreases, The magnetic flux density (magnetic flux density) increases, and the relationship between the magnetic flux density and the spacing d is nonlinear.

As shown in FIG. 3A and FIG. 3B , it is a traditional magnetic position sensing structure using two magnets 11 and a Hall sensor (Hallsensor) 12. When the Hall sensor 12 advances along the moving direction, the magnetic flux density and the distance d The relationship between is more linear than that of the aforementioned embodiment, but additional magnets need to be installed, so the structure is complicated and the cost is increased.

As shown in FIG. 4A and FIG. 4B, it is a magnetic position sensing structure using four magnets 11 and a Hall sensor (Hallsensor) 12. When the Hall sensor 12 advances along the moving direction, the magnetic flux density and the distance d The relationship between is more linear than that of the aforementioned embodiments, but it is still necessary to increase the arrangement of magnets, so the structure is complicated and the cost is increased.

Therefore, the present invention provides an "aperture actuator, magnetic position sensing structure and its setting method" with simple structure, simple manufacturing process, fast production, cost saving and reduced product variation. After several researches and experiments, the invention is finally completed .

Contents of the invention

In view of the above-mentioned problems, the object of the present invention is to provide an aperture actuator, a magnetic position sensing structure and a setting method thereof. Only one magnetic component can be used to make the signal output and position of the magnetic position sensing structure different from the conventional technology. The comparison shows a substantially linear relationship, so as to achieve the effects of simple structure, simple manufacturing process, fast production, cost saving and reduced product variation.

Therefore, to achieve the above object, an aperture actuator according to the present invention includes a magnetic position sensing structure, at least one driving component and a light shielding component. Wherein, the magnetic position sensing structure includes a magnetic component and a magnetic sensing component, and the magnetic component and the magnetic sensing component are arranged opposite to each other; Rotational movement makes the distance and angle between the magnetic component and the magnetic sensing component change simultaneously, and mutual compensation achieves a linear relationship between the magnetic flux induced by the magnetic sensing component and the distance between the magnetic component and the magnetic sensing component; shading The component is linked with the drive component.

To achieve the above object, a magnetic position sensing structure according to the present invention includes a magnetic component and a magnetic sensing component disposed opposite to each other. Wherein, the magnetic component or the magnetic sensing component rotates around a rotation center, so that the distance and angle between the magnetic component and the magnetic sensing component change at the same time, and the mutual compensation achieves a magnetic flux induced by the magnetic sensing component and a magnetic field. The distance between the component and the magnetic sensing component has a linear relationship.

In order to achieve the above object, a method for arranging a magnetic position sensing structure according to the present invention includes the following steps: firstly, providing a magnetic component and a magnetic sensing component that are arranged opposite to each other; then, using a rotation center, relatively moving Magnetic components or magnetic sensing components, so that the distance and angle between the magnetic components and the magnetic sensing components are changed at the same time; then, adjust the position of the magnetic components or magnetic sensing components so that they can compensate each other to achieve the magnetic sensing components induced A magnetic flux system has a linear relationship with the distance between the magnetic component and the magnetic sensing component; finally, the positions of the magnetic component and the magnetic sensing component are fixed.

Based on the above, because according to an aperture actuator, a magnetic position sensing structure and its setting method of the present invention, a single magnetic component or a magnetic sensing component is set in a structure with a relative movement of a rotation center, the magnetic component The magnetic flux between the magnetic sensing components is inversely proportional to the square of the distance, and has a cosine (cos) relationship with the included angle (such as formula 1);

ψ＝∫B·dA＝BAcosθ (Formula 1)

Wherein, ψ is the magnetic flux, B is the magnetic flux density vector, dA is the unit area vector of the magnetic flux density sensing area of the magnetic sensing component, and θ is the angle between the magnetic flux density sensing area and the magnetic flux density vector.

At the same time, change the distance and angle between the magnetic component and the magnetic sensing component to make them compensate each other to achieve the signal output and position of the magnetic position sensing structure. The traditional linear drive device and method achieve the effects of simple structure, simple manufacturing process, fast production, cost saving and reduced product variation.

Description of drawings

FIG. 1A and FIG. 1B respectively show a schematic diagram of a traditional magnetic position sensing structure using a magnet and a Hall sensor and the relationship between the magnetic flux density and the distance;

FIG. 2A and FIG. 2B respectively show a schematic view of another conventional magnetic position sensing structure using a magnet and a Hall sensor and the relationship between the magnetic flux density and the distance;

3A and FIG. 3B respectively show a schematic diagram of a traditional magnetic position sensing structure using two magnets and a Hall sensor and the relationship between the magnetic flux density and the distance;

FIG. 4A and FIG. 4B respectively show a schematic diagram of a conventional magnetic position sensing structure using four magnets and a Hall sensor and the relationship between the magnetic flux density and the distance;

5 to 7 show a schematic diagram of the relative movement of the magnetic assembly and the magnetic sensing assembly of an aperture actuator and its magnetic position sensing structure according to a preferred embodiment of the present invention;

Fig. 8 shows a flow chart of a magnetic position sensing method according to a preferred embodiment of the present invention; and

9 is a schematic diagram showing a substantially linear relationship between the magnetic flux induced by the magnetic sensing component and the included angle of the magnetic component of an aperture actuator, a magnetic position sensing structure and an arrangement method thereof according to a preferred embodiment of the present invention.

Explanation of main component symbols

11 magnets

12 Hall sensor

2 aperture actuator

21 shading components

211 Shading Department

22 Magnetic position sensing structure

221 Magnetic Assembly

222 Magnetic sensing components

23 drive components

24 connection part

25 circuit boards

26 Fixed components

27 Adjustment components

C center of rotation

d spacing

Detailed ways

An aperture actuator, a magnetic position sensing structure and an arrangement method thereof according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

Referring to FIG. 5 , an aperture actuator 2 according to a preferred embodiment of the present invention includes a light shielding component 21 , a magnetic position sensing structure 22 and a driving component 23 . Wherein, the light-shielding component 21 has at least one light-shielding portion 211 , and the light-shielding component 21 can be connected with the driving component 23 through a connecting portion 24 .

The magnetic position sensing structure 22 includes a magnetic component 221 and a magnetic sensing component 222; the driving component 23 drives the magnetic component 221 or the magnetic sensing component 222 to be opposite to the rotation center C according to an actuation signal of the control system (not shown in the figure). movement, and drive the displacement of the shading assembly 21 to control the size of the aperture.

In this embodiment, the magnetic sensing component 222 can be fixedly arranged on a circuit board 25, and the driving component 23 drives the magnetic component 221 to rotate around the rotation center C, so as to generate a relative movement with the magnetic sensing component 222; Alternatively, the driving component 23 can also drive the magnetic sensing component 222 to rotate around the rotation center C, so as to generate relative motion with the magnetic component 221 .

The magnetic sensing component 222 can be a non-contact magnetic sensing component, that is, a magnetic sensing component that can sense its magnetic field without touching the magnetic component 221, such as but not limited to a Hall sensor or a magnetoresistive sensor. Sensor (magnetoresistive sensor).

The aperture actuator 2 of the present invention also includes at least one adjustment mechanism 27, which is located between the magnetic assembly 221 and the magnetic sensing assembly 222, as shown in FIG. Relative to the initial position, it is possible to avoid the progressive error of the magnetic assembly 221 and the magnetic sensing assembly 222, resulting in inconsistent quality of the manufactured aperture actuator 2; wherein, the adjustment mechanism 27 includes an elastic assembly, such as but not limited to spring.

The aperture actuator 2 of the present invention also includes at least one fixing component 26, which is used to fix the relative position of the magnetic sensing component 222 and the magnetic component 221; stuck.

Please refer to FIG. 6 and FIG. 7 again, when the driving component 23 drives the magnetic component 221 to rotate around the center of rotation C according to an actuation signal from the control system, so as to generate relative motion with the magnetic sensing component 222, it will Drive the displacement of the shading assembly 21 to control the size of the aperture.

The magnetic flux between the magnetic component 221 and the magnetic sensing component 222 is inversely proportional to the square of the distance, and has a cosine (cos) relationship with the included angle (such as formula 1);

φ＝∫B·dA＝BAcos θ (Formula 1)

Wherein, φ is the magnetic flux, B is the magnetic flux density vector, dA is the unit area vector of the magnetic flux density sensing area of the magnetic sensing component 222, and θ is the angle between the magnetic flux density sensing area and the magnetic flux density vector. At this time, with the two-dimensional movement of the magnetic component 221, it will have a double change of the distance and the included angle relative to the magnetic sensing component 222. Through the structural arrangement of the present invention, the changes of the distance and the included angle are mutually compensated to achieve magnetic The signal output of the position sensing structure 22 has a substantially linear relationship with the position, that is, a magnetic flux induced by the magnetic sensing component 222 and the position of the magnetic component 221 have a substantially linear relationship close to linear (as shown in FIG. 9 ), so the driving component 23 can use a linear driving method to achieve the effects of simple structure, simple manufacturing process, fast production, cost saving and reduced product variation. Wherein, the magnetic flux can also be a magnetic flux density, that is, a magnetic flux density induced by the magnetic sensing element 222 has a substantially linear relationship with the position of the magnetic element 221 . In addition to Formula 1, the included angle between the magnetic component 221 and the magnetic sensing component 222 of the present invention can also be other relationships.

The aperture actuator 2 of the present invention can be applied to electronic devices, such as but not limited to camera phones, digital cameras, digital video cameras, digital light processors (Digital Light Processor, DLP), projectors or scanners.

Referring again to FIG. 5 , a magnetic position sensing structure 22 according to a preferred embodiment of the present invention includes a magnetic component 221 and a magnetic sensing component 222 , the magnetic component and the magnetic sensing component are disposed opposite to each other. Wherein, the magnetic component 221 or the magnetic sensing component 222 rotates around a rotation center C, so that the distance and angle between the magnetic component 221 and the magnetic sensing component 222 change at the same time, and mutual compensation is achieved and the magnetic sensing component 222 An induced magnetic flux has a substantially linear relationship with the position of the magnetic component 221 .

Please refer to FIG. 8 , a method for setting a magnetic position sensing structure according to a preferred embodiment of the present invention includes the following steps: providing a magnetic component and a magnetic sensing component opposite to each other in step S1; and then in step S1 S2 uses a rotation center to relatively move the magnetic assembly or the magnetic sensing assembly, so that the distance and angle between the magnetic assembly and the magnetic sensing assembly change simultaneously; then adjust the position of the magnetic assembly or the magnetic sensing assembly in step S3 to make it Mutual compensation achieves a substantially linear relationship between the magnetic flux induced by the magnetic sensing component and the position of the magnetic component; finally, in step S4 , the relative initial positions of the magnetic component and the magnetic sensing component are fixed.

The adjusting step S3 and the fixing step S4 can be achieved by the aforementioned adjusting mechanism and fixing component respectively, and will not be repeated here.

In summary, according to an aperture actuator, a magnetic position sensing structure and its setting method according to the present invention, a single magnetic component or a magnetic sensing component is set in a structure that moves relative to a center of rotation, and the magnetic component is utilized The magnetic flux between the magnetic sensing components is inversely proportional to the square of the distance, and has a cosine (cos) relationship with the included angle (such as formula 1). Compared with the traditional technology, the signal output and position of the magnetic position sensing structure have a substantially linear relationship that is close to linear. The traditional linear drive device and method can be used to achieve simple structure, simple manufacturing process, fast production, cost saving and Efficacy to reduce product variability.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change without departing from the spirit and scope of the present invention shall be included in the scope of the present invention.

Claims (24)

1. A diaphragm actuator comprising: A magnetic position sensing structure, the magnetic position sensing structure includes a magnetic component and a magnetic sensing component, the magnetic component and the magnetic sensing component are arranged opposite to each other; A driving component, which connects and drives the magnetic component or the magnetic sensing component, so that the distance and angle between the magnetic component and the magnetic sensing component change at the same time, so as to achieve a magnetic flux induced by the magnetic sensing component and the magnetic flux The distance between the component and the magnetic sensing component has a linear relationship; and A shading component is connected with the driving component. 2. The aperture actuator according to claim 1, wherein the driving component drives the magnetic component or the magnetic sensing component to rotate around a rotation center, so that the magnetic component and the magnetic sensing component The distance between the measured components and the included angle are changed at the same time. 3. The aperture actuator according to claim 1, wherein the magnetic sensing component has a magnetic flux density sensing area, and the magnetic flux induced by it is as shown in Formula 1: φ＝∫B·dA＝BAcosθ (Formula 1) Among them, φ is the magnetic flux, B is the magnetic flux density vector, dA is the unit area vector of the magnetic flux density sensing area, and θ is the angle between the magnetic flux density sensing area and the magnetic flux density vector. 4. The aperture actuator according to claim 1, wherein the driving component is a linear driving component. 5. The aperture actuator according to claim 1, wherein the magnetic sensing element is a non-contact magnetic sensing element. 6. The aperture actuator according to claim 1, wherein the magnetic sensing component is a Hall sensor or a magnetoresistive sensor. 7. The aperture actuator according to claim 1, further comprising: At least one adjustment mechanism, which is located between the magnetic component and the magnetic sensing component, when the magnetic component or the magnetic sensing component rotates around a rotation center while changing the distance and angle between them, adjust Relative initial positions of the magnetic component and the magnetic sensing component. 8. The aperture actuator according to claim 7, wherein the adjusting mechanism comprises an elastic component. 9. The aperture actuator according to claim 7, wherein the adjusting mechanism comprises a spring. 10. The aperture actuator according to claim 1, further comprising at least one fixing component for fixing the positions of the magnetic component and the magnetic sensing component, wherein the fixing method of the fixing component is screw lock, Bonding, fitting or snapping. 11. A magnetic position sensing structure comprising: a magnetic assembly; and a magnetic sensing component, which is arranged opposite to the magnetic component; Wherein, the magnetic component and the magnetic sensing component move relative to each other, so that the distance and angle between the magnetic component and the magnetic sensing component change at the same time, so that a magnetic flux induced by the magnetic sensing component and the magnetic component and The distance between the magnetic sensing components is in a linear relationship. 12. The magnetic position sensing structure according to claim 11, wherein the magnetic component or the magnetic sensing component rotates around a rotation center so that the distance between the magnetic component and the magnetic sensing component is The spacing and the included angle change at the same time. 13. The magnetic position sensing structure according to claim 11, wherein the magnetic sensing element has a magnetic flux density sensing region, and the magnetic flux induced by it is as shown in Formula 1: φ＝∫B·dA＝BAcosθ (Formula 1) Among them, φ is the magnetic flux, B is the magnetic flux density vector, dA is the unit area vector of the magnetic flux density sensing area, and θ is the angle between the magnetic flux density sensing area and the magnetic flux density vector. 14. The magnetic position sensing structure according to claim 11, wherein the magnetic sensing element is a non-contact magnetic sensing element. 15. The magnetic position sensing structure according to claim 11, wherein the magnetic sensing component is a Hall sensor or a magnetoresistive sensor. 16. A method for setting a magnetic position sensing structure, comprising the following steps: providing a magnetic component and a magnetic sensing component opposite to each other; Driving the magnetic assembly and the magnetic sensing assembly to move relative to each other, so that the distance and angle between the magnetic assembly and the magnetic sensing assembly change simultaneously; Adjusting the position of the magnetic component or the magnetic sensing component to compensate each other to achieve a linear relationship between a magnetic flux induced by the magnetic sensing component and a distance between the magnetic component and the magnetic sensing component; and The relative initial positions of the magnetic component and the magnetic sensing component are fixed. 17. The method for setting up a magnetic position sensing structure according to claim 16, wherein the magnetic component or the magnetic sensing component is driven to rotate around a rotation center, so that the magnetic component and the magnetic The distance and the included angle between the sex sensing components are changed at the same time. 18. The method for arranging the magnetic position sensing structure according to claim 16, wherein the magnetic sensing component has a magnetic flux density sensing area, and the magnetic flux induced by it is as shown in Formula 1: φ＝∫B·dA＝BAcosθ (Formula 1) Among them, φ is the magnetic flux, B is the magnetic flux density vector, dA is the unit area vector of the magnetic flux density sensing area, and θ is the angle between the magnetic flux density sensing area and the magnetic flux density vector. 19 . The method for setting up the magnetic position sensing structure according to claim 16 , wherein the magnetic sensing element is a non-contact magnetic sensing element. 20 . The method for setting the magnetic position sensing structure according to claim 16 , wherein the magnetic sensing component is a Hall sensor or a magnetoresistive sensor. 21 . 21 . The method for setting a magnetic position sensing structure according to claim 16 , wherein in the adjusting step, at least one adjusting mechanism is used to adjust the position of the magnetic component or the magnetic sensing component. 22. The method for setting the magnetic position sensing structure according to claim 21, wherein the adjusting mechanism comprises an elastic component. 23. The method for setting the magnetic position sensing structure according to claim 21, wherein the adjusting mechanism comprises a spring. 24. The installation method of the magnetic position sensing structure according to claim 21, wherein in the fixing step, at least one fixing component is used to fix the positions of the magnetic component and the magnetic sensing component, wherein the The fixing method of the fixing component is screw locking, bonding, fitting or fastening.

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