CN100388038C - Diaphragm actuator and its magnetic position sensing structure and setting method - Google Patents
Diaphragm actuator and its magnetic position sensing structure and setting method Download PDFInfo
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- CN100388038C CN100388038C CNB2005100897658A CN200510089765A CN100388038C CN 100388038 C CN100388038 C CN 100388038C CN B2005100897658 A CNB2005100897658 A CN B2005100897658A CN 200510089765 A CN200510089765 A CN 200510089765A CN 100388038 C CN100388038 C CN 100388038C
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Abstract
A light ring actuator is prepared as forming magnetism position sensing unit by a magnetism component and magnetism sensing component being set opposite to said magnetic component, driving magnetism component or magnetism sensing component to make space and included angle between two said components be changed simultaneously for obtaining linear relation of magnetic flux system induced by magnetism sensing component to position of magnetism component by mutual compensation, connecting light shading component to driving unit.
Description
Technical field
The present invention is about a kind of magnetic position sensing structure and method to set up thereof, especially in regard to a kind of magnetic position sensing structure and method to set up thereof that is applied in diaphragm actuator.
Background technology
Along with scientific-technical progress, the demand of image capture and image processing improves day by day, the magnetic flux (magnetic flux) that tradition adopts the lens aperture (iris diaphragm) of magnet and magnetic position sensor that magnetic position sensor is responded to is converted to the voltage output signal, because it is improper that structure is provided with, make and to be a linear relationship between magnetic flux (or voltage) and the magnet positions, so need collocation non-linear drive apparatus and method, this will cause complex structure and cost to improve; If many magnet are set, it is compensated mutually and the magnetic flux that magnetic position sensor is responded to is adjusted into linear relationship as far as possible, then, also can cause the raising of complex structure and cost because of using component count to increase.
Shown in Figure 1A and Figure 1B, it is the magnetic position sensing structure that tradition is used a magnet 11 and a Hall element (Hallsensor) 12, when magnet 11 when direction of motion is advanced, spacing d reduces, magnetic flux density (magnetic flux density) increases, and the pass of magnetic flux density and spacing d is non-linear.
Shown in Fig. 2 A and Fig. 2 B, it is the another kind of magnetic position sensing structure that uses a magnet 11 and a Hall element (Hall sensor) 12 of tradition, when magnet 11 when direction of motion is advanced, spacing d reduces, magnetic flux density (magnetic flux density) increases, and the pass of magnetic flux density and spacing d is non-linear.
Shown in Fig. 3 A and Fig. 3 B, it is the magnetic position sensing structure that tradition is used two magnet 11 and a Hall element (Hallsensor) 12, when Hall element 12 when direction of motion is advanced, the relation of magnetic flux density and spacing d is linear than aforementioned embodiments, but need to increase magnet is set, so complex structure and cost improve.
Shown in Fig. 4 A and Fig. 4 B, it is the magnetic position sensing structure that tradition is used four magnet 11 and a Hall element (Hallsensor) 12, when Hall element 12 when direction of motion is advanced, the relation of magnetic flux density and spacing d is linear than aforementioned embodiments, but still need to increase magnet is set, so complex structure and cost improve.
Therefore, the invention provides a kind of simple in structure, manufacture craft is simple and easy, production is quick, save cost and reduce " diaphragm actuator, magnetic position sensing structure and the method to set up thereof " that product becomes different, several times research experiment is eventually to finishing the present invention.
Summary of the invention
Because above-mentioned problem, purpose of the present invention provides a kind of diaphragm actuator, magnetic position sensing structure and method to set up thereof, only use a magnet assembly, can make the signal output and the position of magnetic position sensing structure, compare with conventional art and to be a material line sexual intercourse, with reach simple in structure, manufacture craft is simple and easy, production is quick, save cost and reduce the effect that product becomes different.
So for achieving the above object, a kind of diaphragm actuator according to the present invention comprises a magnetic position sensing structure, at least one driven unit and a light shield device.Wherein, magnetic position sensing structure comprises a magnet assembly and a magnetic sensing component, and this magnet assembly and this magnetic sensing component are positioned opposite to each other; Driven unit binding and driving magnet assembly or magnetic sensing component are that the center of circle is rotated motion with a rotation center, make spacing and angle between magnet assembly and magnetic sensing component change simultaneously, mutually compensation reaches a magnetic flux that the magnetic sensing component responded to and the spacing between magnet assembly and this magnetic sensing component is a linear relationship; Light shield device and driven unit link.
For achieving the above object, a kind of magnetic position sensing structure according to the present invention comprises that a magnet assembly and a magnetic sensing component are positioned opposite to each other.Wherein, magnet assembly or magnetic sensing component are that the center of circle is rotated motion with a rotation center, make spacing and angle between magnet assembly and magnetic sensing component change simultaneously, mutually compensation reaches a magnetic flux that the magnetic sensing component responded to and the spacing between magnet assembly and this magnetic sensing component is a linear relationship.
For achieving the above object, according to the method to set up of a kind of magnetic position sensing structure of the present invention, comprise the following steps: at first, a magnet assembly and a magnetic sensing component positioned opposite to each other is provided; Then, with a rotation center, relative motion magnet assembly or magnetic sensing component make that spacing and the angle between magnet assembly and magnetic sensing component changes simultaneously; Then, adjust the position of magnet assembly or magnetic sensing component, it is compensated mutually reach a magnetic flux system that the magnetic sensing component responded to and the spacing between magnet assembly and this magnetic sensing component is a linear relationship; At last, the position of fixed magnetic assembly and magnetic sensing component.
From the above, because of a kind of diaphragm actuator according to the present invention, magnetic position sensing structure and method to set up thereof, by the structure setting of single magnet assembly or magnetic sensing component with a rotation center relative motion, utilize magnetic flux between magnet assembly and magnetic sensing component and spacing square to be inversely proportional to, become cosine (cos) relation (suc as formula 1) with angle;
ψ=∫ BdA=BAcos θ (formula 1)
Wherein, ψ is a magnetic flux, and B is the magnetic flux density vector, and dA is the unit area vector of the magnetic flux density induction zone of magnetic sensing component, and θ is the angle between magnetic flux density induction zone and magnetic flux density vector.
Change spacing and angle between magnet assembly and magnetic sensing component simultaneously, make it compensate signal output and the position that reaches magnetic position sensing structure mutually, be the material line sexual intercourse of a convergence linearity compared to conventional art, can use conventional linear drive unit and method, reach simple in structure, manufacture craft is simple and easy, production is quick, save cost and reduce the effect that product becomes different.
Description of drawings
Figure 1A and Figure 1B show that respectively tradition uses the synoptic diagram of the relation of a kind of magnetic position sensing structure of a magnet and a Hall element and magnetic flux density and spacing;
Fig. 2 A and Fig. 2 B show that respectively tradition uses the synoptic diagram of the relation of the another kind of magnetic position sensing structure of a magnet and a Hall element and magnetic flux density and spacing;
Fig. 3 A and Fig. 3 B show that respectively tradition uses the synoptic diagram of the relation of a kind of magnetic position sensing structure of two magnet and a Hall element and magnetic flux density and spacing;
Fig. 4 A and Fig. 4 B show that respectively tradition uses the synoptic diagram of the relation of a kind of magnetic position sensing structure of four magnet and a Hall element and magnetic flux density and spacing;
Fig. 5 to Fig. 7 shows a kind of diaphragm actuator and the magnet assembly of magnetic position sensing structure and the synoptic diagram of magnetic sensing component relative motion of the preferred embodiment of the present invention;
Fig. 8 shows the process flow diagram of a kind of magnetic position sensing method of the preferred embodiment of the present invention; And
Fig. 9 shows that the angle of magnetic flux that the magnetic sensing component of a kind of diaphragm actuator, magnetic position sensing structure and the method to set up thereof of the preferred embodiment of the present invention is responded to and magnet assembly is the synoptic diagram of a material line sexual intercourse.
The primary clustering symbol description
11 magnet
12 Hall elements
2 diaphragm actuators
21 light shield devices
211 light shielding parts
22 magnetic position sensing structures
221 magnet assemblies
222 magnetic sensing components
23 driven units
24 connecting portions
25 circuit boards
26 fixation kits
27 adjust assembly
The C rotation center
The d spacing
Embodiment
Hereinafter with reference to relevant drawings, a kind of according to the preferred embodiment of the invention diaphragm actuator, magnetic position sensing structure and method to set up thereof are described, wherein identical assembly will be illustrated with identical reference marks.
Please refer to shown in Figure 5ly, a kind of according to the preferred embodiment of the invention diaphragm actuator 2 comprises a light shield device 21, a magnetic position sensing structure 22 and a driven unit 23.Wherein, light shield device 21 has at least one light shielding part 211, and light shield device 21 can be connected with driven unit 23 by a junction 24.
Magnetic position sensing structure 22 comprises a magnet assembly 221 and a magnetic sensing component 222; Driven unit 23 drives magnet assembly 221 or magnetic sensing component 222 with rotation center C relative motion according to the control system one start signal of (figure does not show), and drives light shield device 21 displacements with the control aperture size.
In the present embodiment, magnetic sensing component 222 can be fixedly installed on the circuit board 25, and it is that the center of circle is rotated motion with rotation center C that driven unit 23 drives magnet assembly 221, makes with magnetic sensing component 222 and produces a relative motion; Perhaps, it is that the center of circle is rotated motion with rotation center C that driven unit 23 also can drive magnetic sensing component 222, makes with magnet assembly 221 and produces relative motion.
Please refer to Fig. 6 and shown in Figure 7 again, when the start signal of driven unit 23 according to control system, driving magnet assembly 221 is that the center of circle is rotated motion with rotation center C, when making with the 222 generation relative motions of magnetic sensing component, can drive light shield device 21 displacements with the control aperture size.
Square be inversely proportional to by the magnetic flux of 222 of magnet assembly 221 and magnetic sensing components and spacing, become cosine (cos) relation (suc as formula 1) with angle;
φ=∫ BdA=BAcos θ (formula 1)
Wherein, φ is a magnetic flux, and B is the magnetic flux density vector, and dA is the unit area vector of the magnetic flux density induction zone of magnetic sensing component 222, and θ is the angle between magnetic flux density induction zone and magnetic flux density vector.At this moment, two dimensional motion along with magnet assembly 221, it can have the dual variation of spacing and angle simultaneously with respect to magnetic sensing component 222, via structure setting of the present invention, and the signal that spacing and variable angle is compensated mutually reach magnetic position sensing structure 22 output is a material line sexual intercourse with the position, that is the magnetic flux that magnetic sensing component 222 is responded to is the material line sexual intercourse (as shown in Figure 9) that is a convergence linearity with the position of magnet assembly 221, so driven unit 23 can use a Linear Driving method, reaches simple in structure, manufacture craft is simple and easy, produce fast, save cost and reduce the effect that product becomes different.Wherein, magnetic flux also can be magnetic flux density, that is the position of the magnetic flux density system that responded to of magnetic sensing component 222 and magnet assembly 221 is a material line sexual intercourse.Except that formula 1, the angle that magnet assembly 221 of the present invention and magnetic sensing component are 222 also can be other relation.
Please refer to shown in Figure 5ly again, a kind of according to the preferred embodiment of the invention magnetic position sensing structure 22 comprises a magnet assembly 221 and a magnetic sensing component 222, and this magnet assembly and this magnetic sensing component are positioned opposite to each other.Wherein, magnet assembly 221 or magnetic sensing component 222 are that the center of circle is rotated motion with a rotation center C, make the spacing and the angle of 222 of magnet assembly 221 and magnetic sensing components change simultaneously, the magnetic flux system that compensation reaches and magnetic sensing component 222 is responded to mutually is a material line sexual intercourse with the position of magnet assembly 221.
Please refer to shown in Figure 8, a kind of method to set up of magnetic position sensing structure according to the preferred embodiment of the invention, comprising the following steps: provides a magnet assembly and a magnetic sensing component positioned opposite to each other at step S1; Then at step S2 with a rotation center, relative motion magnet assembly or magnetic sensing component make that spacing and the angle between magnet assembly and magnetic sensing component changes simultaneously; Then adjust the position of magnet assembly or magnetic sensing component, it is compensated mutually reach a magnetic flux that the magnetic sensing component responded to and the position of magnet assembly is a material line sexual intercourse at step S3; Last at the relative initial position of step S4 fixed magnetic assembly with the magnetic sensing component.
Set-up procedure S3 and fixing step S4 can reach with aforesaid adjusting mechanism and fixation kit respectively, do not repeat them here.
In sum, because of a kind of diaphragm actuator according to the present invention, magnetic position sensing structure and method to set up thereof, by the structure setting of single magnet assembly or magnetic sensing component with a rotation center relative motion, utilize magnetic flux between magnet assembly and magnetic sensing component and spacing square to be inversely proportional to, become cosine (cos) relation (suc as formula 1) with angle, change spacing and angle between magnet assembly and magnetic sensing component simultaneously, make it compensate signal output and the position that reaches magnetic position sensing structure mutually, be the material line sexual intercourse of a convergence linearity compared to conventional art, can use conventional linear drive unit and method, reach simple in structure, manufacture craft is simple and easy, produce fast, save cost and reduce the effect that product becomes different.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be included in the scope of the present invention its equivalent modifications of carrying out or change.
Claims (24)
1. diaphragm actuator comprises:
One magnetic position sensing structure, this magnetic position sensing structure comprise a magnet assembly and a magnetic sensing component, and this magnet assembly and this magnetic sensing component are positioned opposite to each other;
One driven unit, binding also drives this magnet assembly or this magnetic sensing component, make spacing and angle between this magnet assembly and this magnetic sensing component change simultaneously, reach magnetic flux that this magnetic sensing component responded to and the spacing between this magnet assembly and this magnetic sensing component and be a linear relationship; And
One light shield device links with this driven unit.
2. diaphragm actuator according to claim 1, it is characterized in that, wherein this driven unit drives this magnet assembly or this magnetic sensing component is that the center of circle is rotated motion with a rotation center, makes that spacing and the angle between this magnet assembly and this magnetic sensing component changes simultaneously.
3. diaphragm actuator according to claim 1 is characterized in that, wherein this magnetic sensing component has a magnetic flux density induction zone, its this magnetic flux of responding to as shown in Equation 1:
φ=∫ BdA=BAcos θ (formula 1)
Wherein, φ is a magnetic flux, and B is the magnetic flux density vector, and dA is the unit area vector of magnetic flux density induction zone, and θ is the angle between magnetic flux density induction zone and magnetic flux density vector.
4. diaphragm actuator according to claim 1 is characterized in that, wherein this driven unit is a Linear Driving assembly.
5. diaphragm actuator according to claim 1 is characterized in that, wherein this magnetic sensing component is a contactless magnetic sensing component.
6. diaphragm actuator according to claim 1 is characterized in that, wherein this magnetic sensing component is a Hall element or a reluctive transducer.
7. diaphragm actuator according to claim 1 is characterized in that, also comprises:
At least one adjusting mechanism, it is between this magnet assembly and this magnetic sensing component, this magnet assembly or this magnetic sensing component with a rotation center be the center of circle be rotated motion and change simultaneously therebetween spacing and during angle, adjust the relative initial position of this magnet assembly and this magnetic sensing component.
8. diaphragm actuator according to claim 7 is characterized in that wherein this adjusting mechanism comprises an elastic parts.
9. diaphragm actuator according to claim 7 is characterized in that wherein this adjusting mechanism comprises a spring.
10. diaphragm actuator according to claim 1 is characterized in that, also comprises at least one fixation kit, fixes the position of this magnet assembly and this magnetic sensing component, and wherein the fixed form of this fixation kit is screw lock, bonding, fit or fixing.
11. a magnetic position sensing structure comprises:
One magnet assembly; And
One magnetic sensing component, itself and this magnet assembly is oppositely arranged;
Wherein, this magnet assembly and this magnetic sensing component carry out relative motion, make spacing and angle between this magnet assembly and this magnetic sensing component change simultaneously, reach magnetic flux that this magnetic sensing component responded to and the spacing between this magnet assembly and this magnetic sensing component and be a linear relationship.
12. magnetic position sensing structure according to claim 11, it is characterized in that, wherein this magnet assembly or this magnetic sensing component are that the center of circle is rotated motion with a rotation center, make that spacing and the angle between this magnet assembly and this magnetic sensing component changes simultaneously.
13. magnetic position sensing structure according to claim 11 is characterized in that, wherein this magnetic sensing component has a magnetic flux density induction zone, its this magnetic flux of responding to as shown in Equation 1:
φ=∫ BdA=BAcos θ (formula 1)
Wherein, φ is a magnetic flux, and B is the magnetic flux density vector, and dA is the unit area vector of magnetic flux density induction zone, and θ is the angle between magnetic flux density induction zone and magnetic flux density vector.
14. magnetic position sensing structure according to claim 11 is characterized in that, wherein this magnetic sensing component is a contactless magnetic sensing component.
15. magnetic position sensing structure according to claim 11 is characterized in that, wherein this magnetic sensing component is a Hall element or a reluctive transducer.
16. the method to set up of a magnetic position sensing structure comprises the following steps:
A magnet assembly and a magnetic sensing component positioned opposite to each other is provided;
Drive this magnet assembly and this magnetic sensing component carries out relative motion, make that spacing and the angle between this magnet assembly and this magnetic sensing component changes simultaneously;
Adjust the position of this magnet assembly or this magnetic sensing component, it is compensated mutually reach magnetic flux system that this magnetic sensing component responded to and the spacing between this magnet assembly and this magnetic sensing component is a linear relationship; And
Fix the relative initial position of this magnet assembly and this magnetic sensing component.
17. the method to set up of magnetic position sensing structure according to claim 16, it is characterized in that, wherein driving this magnet assembly or this magnetic sensing component is that the center of circle is rotated motion with a rotation center, makes that spacing and the angle between this magnet assembly and this magnetic sensing component changes simultaneously.
18. the method to set up of magnetic position sensing structure according to claim 16 is characterized in that, wherein this magnetic sensing component has a magnetic flux density induction zone, its this magnetic flux of responding to as shown in Equation 1:
φ=∫ BdA=BAcos θ (formula 1)
Wherein, φ is a magnetic flux, and B is the magnetic flux density vector, and dA is the unit area vector of magnetic flux density induction zone, and θ is the angle between magnetic flux density induction zone and magnetic flux density vector.
19. the method to set up of magnetic position sensing structure according to claim 16 is characterized in that, wherein this magnetic sensing component is a contactless magnetic sensing component.
20. the method to set up of magnetic position sensing structure according to claim 16 is characterized in that, wherein this magnetic sensing component is a Hall element or a reluctive transducer.
21. the method to set up of magnetic position sensing structure according to claim 16 is characterized in that, wherein in this set-up procedure, adjusts the position of this magnet assembly or this magnetic sensing component with at least one adjusting mechanism.
22. the method to set up of magnetic position sensing structure according to claim 21 is characterized in that, wherein this adjusting mechanism comprises an elastic parts.
23. the method to set up of magnetic position sensing structure according to claim 21 is characterized in that, wherein this adjusting mechanism comprises a spring.
24. the method to set up of magnetic position sensing structure according to claim 21, it is characterized in that, wherein in this fixing step, with at least one fixation kit, fix the position of this magnet assembly and this magnetic sensing component, wherein the fixed form of this fixation kit is screw lock, bonding, fit or fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100897658A CN100388038C (en) | 2005-08-09 | 2005-08-09 | Diaphragm actuator and its magnetic position sensing structure and setting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100897658A CN100388038C (en) | 2005-08-09 | 2005-08-09 | Diaphragm actuator and its magnetic position sensing structure and setting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1912671A CN1912671A (en) | 2007-02-14 |
| CN100388038C true CN100388038C (en) | 2008-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100897658A Expired - Fee Related CN100388038C (en) | 2005-08-09 | 2005-08-09 | Diaphragm actuator and its magnetic position sensing structure and setting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08136972A (en) * | 1994-11-11 | 1996-05-31 | Canon Inc | Light quantity adjustment device |
| US5915141A (en) * | 1996-12-27 | 1999-06-22 | Canon Kabushiki Kaisha | Shutter device having eccentric pin for adjusting urging force |
| JP2001100269A (en) * | 1999-09-28 | 2001-04-13 | Canon Inc | Light quantity adjusting device and optical equipment equipped therewith |
| JP2001142110A (en) * | 1999-11-16 | 2001-05-25 | Nidec Copal Corp | Electromagnetic actuator, shutter device and diaphragm device |
| CN1469105A (en) * | 2002-06-26 | 2004-01-21 | 株式会社电装 | Magnetic sensing unit with smaller sensitivity to leakage magnetic flux |
-
2005
- 2005-08-09 CN CNB2005100897658A patent/CN100388038C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08136972A (en) * | 1994-11-11 | 1996-05-31 | Canon Inc | Light quantity adjustment device |
| US5915141A (en) * | 1996-12-27 | 1999-06-22 | Canon Kabushiki Kaisha | Shutter device having eccentric pin for adjusting urging force |
| JP2001100269A (en) * | 1999-09-28 | 2001-04-13 | Canon Inc | Light quantity adjusting device and optical equipment equipped therewith |
| JP2001142110A (en) * | 1999-11-16 | 2001-05-25 | Nidec Copal Corp | Electromagnetic actuator, shutter device and diaphragm device |
| CN1469105A (en) * | 2002-06-26 | 2004-01-21 | 株式会社电装 | Magnetic sensing unit with smaller sensitivity to leakage magnetic flux |
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| Publication number | Publication date |
|---|---|
| CN1912671A (en) | 2007-02-14 |
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