CN203744911U - Position detecting device and electronic device using the position detecting device - Google Patents
Position detecting device and electronic device using the position detecting device Download PDFInfo
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- CN203744911U CN203744911U CN201320844296.6U CN201320844296U CN203744911U CN 203744911 U CN203744911 U CN 203744911U CN 201320844296 U CN201320844296 U CN 201320844296U CN 203744911 U CN203744911 U CN 203744911U
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- 238000001514 detection method Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 4
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 3
- 229910000673 Indium arsenide Inorganic materials 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 claims description 3
- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 35
- 238000006073 displacement reaction Methods 0.000 description 15
- 230000033001 locomotion Effects 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Abstract
Provided are a position detecting device capable of restraining influence caused by distance deviation between a magnet and a magnetic sensor, and an electronic device using the position detecting device. A largest moving scope (402) of the left end of a magnet (301) is about 2/3 length (L) of the magnet (301) from the left end of a fixed position of the magnet (301); a largest moving scope (403) of the right end of the magnet (301) is about 2/3 length (L) of the magnet (301) from the right end of a fixed position of the magnet (301). A scope preference of a moving distance prescribed according to a reference position (401) of the magnet (301) in the largest left and right moving scopes (402,403) of the magnet (301) is in a scope of +/-0.30 mm based on the fixed position (reference position) (401) of the magnet (301).
Description
Technical field
The utility model relates to a kind of position detecting device of the movement that detects object and has used the electronic equipment of this position detecting device, in more detail, relate to and a kind ofly used the position detecting device of magnet and Magnetic Sensor and used the electronic equipment of this position detecting device.
Background technology
In recent years, in the market of pocket telephone etc., have the terminal of much having carried the mobile camera with the solid-state imager such as CCD, CMOS, in the optical system that is applied to mobile camera, strong request has the instantaneous sensor that carries out high precision position measuring ability.
In addition, knownly a kind ofly detect the movement of object or the device of inclination or move angle by magnet, magnetic and Magnetic Sensor.And, as the mode of the coordinate measurement in the personal computer indicating equipment (operating rod, tracking ball etc.) of (comprising the computing machine that amusement is used, emulation is used), optical profile type, pressure sensitive, variable resistance type, magnetic detection formula etc. in practical application, but, in recent years, there is the miniaturization of being easy to and magnetic detection formula contactless, this feature of long-life becomes strong.
For example, the device that patent documentation 1 is recorded relates to a kind of position detecting device of the input block as personal computer, pocket telephone etc., relates to a kind of position detecting device that carries out the magnetic detection mode of coordinate measurement by detecting the changes of magnetic field of the surrounding being caused by moving of magnet.
In addition, in the camera heads such as camera, thereby knownly a kind ofly make to be configured in imaging apparatus on optical axis and the camera head of the shake of correcting image is correspondingly moved in the movement of this camera head.
Proofreading and correct in the camera head of this shake, for example known following a kind of structure: use voice coil motor dollying element, and with the magnet of voice coil motor with detect the position of imaging apparatus as the Hall element of magnetic detecting unit.According to such structure, can make driving mechanism and position detecting mechanism integrated and make equipment miniaturization.
For example, shown in patent documentation 2, there is a kind of device that uses Hall element (Magnetic Sensor to) to implement the position probing of optical lens etc.The device that this patent documentation 2 is recorded relate to a kind of by with the plane of shooting light shaft positive cross in dollying element carry out the camera head of correction of jitter.
Patent documentation 1: TOHKEMY 2004-348173 communique
Patent documentation 2: TOHKEMY 2010-15107 communique
Utility model content
The problem that utility model will solve
But; in the camera head of recording at above-mentioned patent documentation 1; press to reach the movement of magnet by finger tip; but lens mobile in pocket telephone are accommodated in protective cover under many circumstances; thereby be difficult to press by finger tip; therefore, need in addition the actuator of mobile lens.Owing to there is magnet, therefore consider this magnet to share the method for using for actuator, but taking to Hall element to the magnetic flux from magnet applying only as the mode of the N utmost point or the S utmost point configures magnet, be therefore difficult to this magnet to share as actuator magnet.
In the camera head of recording at above-mentioned patent documentation 2, solve this problem, so that Hall element has been configured to magnet to the mode that applies the N utmost point and these the two poles of the earth of the S utmost point.Therefore, can common location detect with magnet and actuator magnet by configuration magnet and coil.
In addition, the position detecting device that above-mentioned patent documentation 2 is recorded is the mode that can be applied to the device of the hand shake of correcting digital still camera, excessive this problem points while there is the camera that is applied to pocket telephone.And, in the time that the distance between Magnetic Sensor and magnet (GAP) departs from etc., exist output signal brought to this problem of impact.
Therefore,, by detecting the relative position that is present in the magnet within the scope of the displacement of regulation with respect to the reference position of magnet, also can not bring impact to output signal even if expect that distance (GAP) between Magnetic Sensor and magnet departs from etc.
The utility model completes in view of this problem the electronic equipment that its object is to provide a kind of position detecting device of the deviation inhibitory effect for the distance between magnet and Magnetic Sensor and has used this position detecting device.
For the scheme of dealing with problems
The utility model completes in order to reach this object, utility model described in first method is a kind of position detecting device, possess the magnet configuring in mobile mode freely and at least two Magnetic Sensors that configure along the moving direction of this magnet, detect the relative position of above-mentioned magnet according to the output of this Magnetic Sensor, this position detecting device is characterised in that, possesses position detection part, this position detection part is according to the result obtaining divided by the signal from an above-mentioned Magnetic Sensor and the difference signal of the signal from above-mentioned another Magnetic Sensor with signal of the signal of a Magnetic Sensor from above-mentioned Magnetic Sensor and signal from another Magnetic Sensor, detect the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet, the moving range of above-mentioned magnet for from said reference position ± scope below 0.30mm.
In addition, the utility model described in second method is characterised in that, in the utility model described in first method, above-mentioned magnet is that the N utmost point and the S utmost point are distributed in the magnet on moving direction.
In addition, the utility model described in Third Way is characterised in that, first or second method described in utility model in, above-mentioned Magnetic Sensor is sealing into an encapsulation integratedly.
In addition, the utility model described in cubic formula is characterised in that, in the utility model described in first, second or Third Way, above-mentioned Magnetic Sensor does not possess the magnetic chip for carrying out magnetic amplification.
In addition, the utility model described in the 5th mode is characterised in that, in the utility model described in the either type in first to fourth mode, above-mentioned Magnetic Sensor is the Hall element with the III-V compound semiconductor of GaAs, InAs or InSb.
In addition, the utility model described in the 6th mode is characterised in that, in the utility model described in the either type in the first to the 5th mode, above-mentioned Magnetic Sensor is the semi-conductive Hall element of IV family with Si or Ge.
In addition, utility model described in the 7th mode is characterised in that, in utility model described in either type in the first to the 6th mode, above-mentioned position detection part possesses the AD transducer that the output of above-mentioned Magnetic Sensor is carried out to AD conversion, detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of this AD transducer.
In addition, utility model described in the formula of all directions is characterised in that, in utility model described in either type in the first to the 7th mode, above-mentioned position detection part possesses operational part and test section, this operational part carries out the computing divided by above-mentioned difference signal of above-mentioned and signal, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of above-mentioned operational part.
In addition, utility model described in the 9th mode is characterised in that, in utility model described in either type in the first to the 7th mode, above-mentioned position detection part possesses operational part and test section, this operational part computing makes above-mentioned difference signal become fixing gain coefficient, go forward side by side and be about to this gain coefficient and above-mentioned and computing signal multiplication, this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of above-mentioned operational part.
In addition, utility model described in the tenth mode is characterised in that, first to the from all directions in the utility model described in the either type in formula, above-mentioned position detection part possesses control part and test section, it is fixing that the input value of the above-mentioned Magnetic Sensor of this control part control becomes the difference signal of above-mentioned Magnetic Sensor, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to what carry out above-mentioned Magnetic Sensor after this control with signal.
In addition, utility model described in the 11 mode is characterised in that, first to the from all directions in the utility model described in the either type in formula, above-mentioned position detection part possesses correction unit and test section, it is fixing that the output valve that this correction unit is proofreaied and correct above-mentioned Magnetic Sensor becomes the difference signal of above-mentioned Magnetic Sensor, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to what carry out above-mentioned Magnetic Sensor after this correction with signal.
In addition, utility model described in the 12 mode is a kind of electronic equipment, it is characterized in that possessing: position detecting device and autofocus mechanism described in the either type in the first to the 11 mode, this autofocus mechanism is transfused to the output signal from this position detecting device.
In addition, the utility model described in the 13 mode is characterised in that, in the utility model described in the 12 mode, and the autofocus mechanism that above-mentioned autofocus mechanism is portable terminal.
The effect of utility model
According to the utility model, can realize impact that a kind of deviation of the distance by magnet and Magnetic Sensor causes and diminish and install and become the electronic equipment that is easy to position detecting device and has used this position detecting device.
Brief description of the drawings
Fig. 1 is the stereographic map of the embodiment for the related position detecting device of the utility model is described.
Fig. 2 is the front view of the position detecting device shown in Fig. 1.
Fig. 3 is the circuit block diagram for the related position detecting device of the utility model is described.
Fig. 4 represents that magnet is with respect to the distance of reference position and the figure of relation of magnetic flux that imposes on two Hall elements.
Fig. 5 represents the distance and figure magnetic flux and magnetic flux and the relation of poor magnetic flux that impose on two Hall elements of magnet with respect to reference position.
Fig. 6 represents and the ratio of magnetic flux and poor magnetic flux and the magnet figure with respect to the relation of the distance of reference position.
Fig. 7 be the magnetic flux density that imposes on two Hall elements while being illustrated in moving magnet under the condition shown in table 1 with the figure of magnetic flux with the ratio of poor magnetic flux.
Fig. 8 is the figure that makes the result curve figureization of table 4.
Fig. 9 be the output signal for Hall element is described figure (one of).
Figure 10 is the figure (two) of the output signal for Hall element is described.
Description of reference numerals
10: position detection part; 11: magnetic test section; 12: operational part; 12a:AD transducer; 13: test section; 21a, 21b: Hall element; 301: magnet; 302: magnet ends; 303: the moving direction of magnet; 304: substrate; 401: the reference position of magnet; 402: the maximum mobile range (left end) of magnet; 403: the maximum mobile range (right-hand member) of magnet; 404a, 404b: the center of the sense magnetic surface of Hall element; ST: the scope of the displacement at the center of magnet; W: the width of magnet; L: the length of magnet; H: the height of magnet; S1: Hall element; S2: Hall element; SL: the distance that links the line segment of two Hall elements; SMD (GAP): the center of the sense magnetic surface of two Hall elements and the distance of magnet lower surface; ST: the moving range at the center of magnet.
Embodiment
Below, with reference to the accompanying drawings of embodiment of the present utility model.
< embodiment 1>
Fig. 1 is the stereographic map of the embodiment 1 for the related position detecting device of the utility model is described, is the figure that represents the configuration relation of Magnetic Sensor and magnet.In figure, Reference numeral 301 represents magnet, and 302 represent magnet ends, and 303 represent the moving direction of magnet, and 304 represent substrate.
Position detecting device of the present utility model possesses: magnet 301, and it is configured in mobile mode freely, and the N utmost point and the S utmost point are distributed on moving direction; And along at least two Magnetic Sensor S1, the S2 (21a, 21b) of the moving direction configuration of this magnet 301, detect the relative position of magnet 301 according to the output of this Magnetic Sensor S1, S2 (21a, 21b).
In addition, Magnetic Sensor preferably has the Hall element of the III-V compound semiconductor of GaAs, InAs or InSb etc.In addition, Magnetic Sensor can be also the semi-conductive Hall element of IV family with Si or Ge etc.
The magnet 301 that the position detecting device detection of embodiment 1 is installed on mobile object (is made as W by the width of magnet, the length of magnet is made as to L, the height of magnet is made as to H) with respect to being installed on the Hall element S1 of the fixing object such as device body, the relative position of S2.At this, represent the distance of the line segment that links the first Hall element S1 and the second Hall element S2 with Reference numeral SL.And, by the center of sense magnetic surface and the distance of magnet lower surface of Reference numeral SMD (GAP) expression Hall element S1, S2.
Magnet 301 is rectangular parallelepipeds of width W mm, height H mm, length L mm, and X-direction is magnetized.X-axis is the direction parallel with direction of magnetization, and Y-axis, Z axis have the direction vertical with direction of magnetization.At this, Z axis is the direction vertical with real estate towards real estate from magnet 301.X-axis is the direction parallel with the moving direction 303 of magnet 301, and Y-axis is the direction vertical with the moving direction 303 of magnet 301.In embodiment of the present utility model, magnet 301 is neodymium sintered magnet, and relict flux density is 1200mT (value of common neodymium sintered magnet).The structure below illustrating is an example of the related position detecting device of the utility model, is not limited thereto.
The first Hall element S1 and the second Hall element S2 are arranged on substrate 304 across the distance SL of regulation, magnet 301 is configured to Hall element S1, S2 opposite.Now, magnet 301 be configured in the case of by the linear projection that links the first and second Hall element S1, S2 to overlapping with the central authorities of the width W mm of magnet 301 magnet 301.The direction of the detectable magnetic flux of the first and second Hall element S1, S2 is the direction (Z-direction) vertical with real estate towards real estate from magnet.In addition, the direction of motion 303 of magnet 301 is direction of magnetization (X-direction).
In addition, Hall element is preferably sealing into an encapsulation integratedly.In addition, Hall element does not preferably possess the magnetic chip for carrying out magnetic amplification.
Fig. 2 is the front view of the position detecting device shown in Fig. 1, is the figure that represents the scope of the displacement of Hall element and magnet.In figure, Reference numeral 401 represents the reference position of magnet, 402 represent the maximum mobile range (left end) of magnet, 403 represent the maximum mobile range (right-hand member) of magnet, and 404a, 404b represent the center of the sense magnetic surface of Hall element.In addition, ST represents the scope of the displacement of magnet center.
The scope ST of the displacement at magnet 301 centers in embodiment 1 is ± below 0.3mm.The maximum mobile range 402 of end 302 left ends of magnet 301 is roughly 2/3 the length (right-hand end of magnet 301 covers the limit positions of Hall element 404a) of the length L of magnet 301 from the left end end of the fixed position of magnet 301, roughly 2/3 length that the maximum mobile range 403 of end 302 right-hand members of magnet 301 is the length L of magnet 301 from the right-hand member end of the fixed position of magnet 301 (301 left end of magnet covers the limit positions of Hall element 404b).
By Hall element 404a, 404b be configured to detect the best ± relative position of the magnet 301 that moves in the scope of 0.30mm.
Fig. 3 is the circuit block diagram for the related position detecting device of embodiment 1 is described, in figure, Reference numeral 10 represents position detection part, and 11 represent magnetic test section, and 12 represent operational part, and 13 represent test section, and 12a represents AD transducer.
The position detecting device of embodiment 1 possesses magnetic test section 11 and position detection part 10, and position detection part 10 possesses operational part 12 and test section 13.Hall element 21a and another Hall element 21b that magnetic test section 11 possesses in the X-axis being configured on substrate 304 and installs across the distance SL of regulation.
Operational part 12 computings from the signal X1 (V1) of a Hall element 21a of Hall element 21a, 21b with from another Hall element 21b signal X2's (V2) and signal (X1+X2) and difference signal (X1-X2), and, carry out and signal (X1+X2) divided by the computing of difference signal (X1-X2).And, output operation result (Xo=(X1+X2)/(X1-X2)).
In addition, test section 13 is present in the relative position of the magnet 301 in the scope of displacement of regulation with respect to the reference position of magnet 301 according to the output detections of operational part 12, and the scope of the displacement of the regulation of magnet is preferably ± below 0.3mm.
In addition, operational part 12 possesses the AD transducer 12a that operation result Xo is carried out to AD conversion, and test section 13 detects the relative position of magnet 301 with respect to reference position according to the output of this AD transducer 12a.
Instead, also can by AD transducer 12a respectively to and signal (X1+X2) and difference signal (X1-X2) carry out AD conversion, operational part 12 use the output of AD transducer 12a carry out and signal (X1+X2) divided by the computing of difference signal (X1-X2).
Magnetic test section 11 is made up of two Hall element 21a, 21b, along X-axis configuration two this Hall element 21a, 21b.Near the central authorities of two Hall element 21a, 21b that are disposed at X-axis, dispose magnet.The output voltage of Hall element 21 changes according to the variation in the caused magnetic field of movement of this magnet.The position of the magnet when central part of straight line at center of two Hall elements of link and the central part of the directions X of magnet are consistent is initial point O, and output signal is 0.In the time that magnet moves, correspondingly, operational part 12 produces output signal Xo.This initial point O is made as to the reference position of magnet.
In addition,, as Magnetic Sensor, except Hall element, can also apply the various Magnetic Sensors such as Hall IC, magneto-resistive effect element (MR element), magnetoresistance effect IC (MRIC).
In addition, be made as X1a and X2a at the signal obtaining that the lead-out terminal (positive side) that makes two Hall elements and lead-out terminal (minus side) are reversed, ratio can also apply (X1a-X2)/(X1a+X2) or (X1-X2a)/(X1+X2a).
In addition, be made as X1b and X2b at the signal obtaining that the input terminal (mains side) that makes two Hall elements and input terminal (GND side) are reversed, ratio can also apply (X1b-X2)/(X1b+X2) or (X1-X2b)/(X1+X2b).
Fig. 4 represents that magnet is with respect to the distance of reference position and the figure of relation of magnetic flux that imposes on two Hall elements.In addition, transverse axis be with respect to the position of the magnet of reference position (unit be μ m), the longitudinal axis is magnetic flux density.The position of the known magnetic flux that imposes on Hall element 21a and Hall element 21b in magnet is the closer to the higher state of right side magnetic flux density.
Fig. 5 represents the distance and figure magnetic flux and magnetic flux and the relation of poor magnetic flux that impose on two Hall elements of magnet with respect to reference position.For impose on Hall element 21a and Hall element 21b magnetic flux with magnetic flux and poor magnetic flux.Transverse axis is identical with the longitudinal axis and Fig. 4.(X1+X2) be and proportional value with magnetic flux to be (X1-X2) and the proportional value of poor magnetic flux.
Fig. 6 represents and the ratio of magnetic flux and poor magnetic flux and the magnet figure with respect to the relation of the distance of reference position.Transverse axis is that (μ of unit m), the longitudinal axis is and the ratio of magnetic flux/difference magnetic flux for the position of magnet.Xo be to and the proportional value of ratio of magnetic flux/difference magnetic flux.The output Xo of known operational part 12 and the position of magnet have high linearity.
In addition, conventionally, in the time that the distance (Z-direction) of magnet and Hall element produces deviation, owing to being related to the deterioration of position detection accuracy, therefore need to carry out the position adjustment of Z-direction, but in the utility model, by the displacement of magnet is made as ± below 0.3mm, even if the distance (Z-direction) at magnet and Hall element produces deviation when mounted, also can suppress the impact on position detection accuracy.In addition, show the example of extremely each one of the N utmost point of magnet 301 and S, but this magnet 301 can also use with lower magnet, with magnetic pole, in X-direction, taking initial point O as border extremely respectively there is the magnet of two in the mode of the reversion magnetized N utmost point and S in Z-direction.
Then, below, illustrate with respect to be preferably ± reason below 300 μ m of the magnet displacement of two Hall elements.
< is about the linear > of autofocus mechanism of camera that is equipped on pocket telephone
As position detecting device, there is the position detecting device that possesses automatic focus (AF) mechanism and hand shake correction mechanism in lens position the lens position control part with the output control lens position detecting detecting.There are various algorithms in the algorithm of the autofocus mechanism in this position detecting device, for example, sometimes in lens displacement (stroke), roughly moves 20 left and right and come detection position.That is to say, sometimes need 1/20 positional precision of stroke.In this case, if stroke is 400 (± 200) μ m, positional precision needs below 20 μ m, if stroke is 800 (± 400) μ m, positional precision needs below 40 μ m.
< says the poor > of positional precision in the region of exceed ± 300 μ m
In the case of the magnet of the condition shown in table 1 is fixed on to lens and is made as the movement of movement=magnet of lens, in the time of the significantly exceed ± 300 μ m of displacement (stroke) of magnet, say positional precision poor.
[table 1]
This condition is the common condition using in the autofocus mechanism of pocket telephone.
Fig. 7 be while being illustrated in moving magnet under the condition shown in table 1, impose on two Hall elements magnetic flux density with the figure of magnetic flux with the ratio of poor magnetic flux.
Now, in the time that being quantized, the positional precision of each stroke becomes following table 2.
Positional precision refer to obtain in each magnet positions, solid-line curve and the ratio by two of two end points places of stroke and magnetic flux and poor magnetic flux links the maximal value in the bias that the straight line that obtains departs from.
[table 2]
| Stroke μ m | Positional precision μ m |
| ±100 | 0.54 |
| ±200 | 3.99 |
| ±300 | 15.14 |
| ±400 | 36.46 |
In this case, μ m in stroke ± 400 also can reach 1/20 precision of stroke.
< changes about GAP the precision deterioration > that 100 μ m cause
In the condition shown in table 1 due to the installation deviation of user's side etc. and GAP changes precision 100 μ m and worsens.The deviation of GAP100 μ m is common departure.For example, in the situation that GAP is 0.6mm from 0.7mm variation, become following table 3.
[table 3]
| Stroke μ m | Positional precision μ m |
| ±100 | 0.58 |
| ±200 | 4.31 |
| ±300 | 16.58 |
| ±400 | 40.22 |
In this case, in the time of the μ m of stroke ± 400, cannot reach 1/20 precision of stroke.
<GAP changes the linear deterioration amount > in the situation of 100 μ m
As shown in following table 4, stroke is longer to be changed by GAP the precision that causes and worsens larger.
[table 4]
| Stroke μ m | Linear deterioration amount μ m |
| ±100 | 0.03 |
| ±200 | 0.32 |
| ±300 | 1.43 |
| ±400 | 3.76 |
Fig. 8 be the figure that makes the result curve figureization of table 4 (transverse axis be not with ± but carry out mark by scope, therefore in table 4 ± 300 with 600 marks, ± 400 with 800 marks).That is to say, in the time that stroke is long, with former low precision independently, the deterioration that is changed the precision causing by GAP is also large, therefore needs travel limits to obtain short.Thereby, under the condition shown in table 1, if significantly exceed ± 300 μ m cannot reach precision prescribed due to GAP variation, therefore can understand and expect to be made as ± reason below 300 μ m.
That is to say, the position detection part 13 of the related position detecting device of the utility model detects the relative position that is present in the magnet 301 in the scope of displacement of regulation with respect to the reference position of magnet 301 according to the output of operational part 12, and the scope of the displacement of the regulation of magnet is preferably ± below 0.30mm.
< embodiment 2>
In embodiment 1, illustrate that operational part 12 carries out and signal (X1+X2) is exported the situation of its operation result divided by the computing of difference signal (X1-X2),
Xo=(X1+X2)/(X1-X2)…(1)
But in embodiment 2, illustrate that operational part 12 computings are for making the situation that difference signal (X1-X2) is multiplied by for the gain alpha of fixed value A, by this gain alpha and signal (X1+X2) carries out the output identical with formula (1) of Hall element 21a, 21b.
< is about gain calibration >
The difference signal that is used for making representing taking (X1-X2) is made as to α as the gain of fixed value A.Operational part 12 using (X1+X2) is multiplied by value that gain alpha obtains, α × (X1+X2) after gain calibration and signal (X1+X2) and exporting.
The reason > identical with the Xo obtaining divided by the difference signal representing with (X1-X2) with signal by representing with (X1+X2) with signal (α × (X1+X2)) after < gain calibration
Become α=A/ (X1-X2).
(X1+X2) is multiplied by the value that gain alpha obtains to be become
α×(X1+X2)=A×((X1+X2)/(X1-X2))
Therefore after gain calibration and signal (α × (X1+X2)) result represent above-mentioned formula (1) (say exactly and become the A of formula (1) doubly, if be made as A=1, expression (1)).
Like this, operational part 12 is not as long as the result Xo that output and signal obtain divided by difference signal limits the computing for obtaining this output Xo.
Fig. 9 be the output signal for Hall element is described figure (one of).
The definition > of the output X1 of < Hall element 1 and the output X2 of Hall element 2
The potential difference (PD) that the current potential of the side of the positive electrode terminal of Hall element 1 is deducted to the current potential of negative side terminal and obtain is made as X1, the current potential of the side of the positive electrode terminal of Hall element 2 is deducted to the current potential of negative side terminal and the potential difference (PD) that obtains is made as X2.
That is to say, become X1=(current potential of the side of the positive electrode terminal of Hall element 1)-(current potential of the negative side terminal of Hall element 1), X2=(current potential of the side of the positive electrode terminal of Hall element 2)-(current potential of the negative side terminal of Hall element 2).
The definition > of < side of the positive electrode terminal and negative side terminal
As shown in Figure 9 above, so that drive current towards observe Hall element to the mode under paper from paper time, when the sense magnetic surface of Hall element is applied to the magnetic field of running through to surface from the back side of paper, the terminal that is a high side by current potential is made as side of the positive electrode terminal, and the terminal that is a low side by current potential is made as negative side terminal.
That is to say, in Fig. 9, the terminal on right side becomes side of the positive electrode terminal, the terminal in left side becomes negative side terminal, and (terminal that is not a high side by current potential is defined as side of the positive electrode terminal, being a low side by current potential, terminal is defined as negative side terminal, but the terminal that is a high side by current potential in the time of the configuration that is made as Fig. 9 is made as side of the positive electrode terminal, being a low side by current potential, terminal is made as negative side terminal, therefore according to the direction difference that applies magnetic field, sometimes the current potential of side of the positive electrode terminal is lower than the current potential of negative side terminal, and X1, X2 may become negative value).
Figure 10 is the figure (two) of the output signal for Hall element is described.While supposing, the Hall element in the case of existing Figure 10 to configure like that, the sense magnetic surface of Hall element is applied to the magnetic field of running through to surface from the back side of paper, the current potential of the terminal in paper upside is high, the current potential of the terminal in paper downside is low, therefore become side of the positive electrode terminal in the terminal of paper upside, become negative side terminal in the terminal of paper downside.
Calculate output signal by (current potential of the terminal in paper upside)-(current potential of the terminal in paper downside).
In embodiment 2, illustrate that operational part 12 computings are used for making Hall element 21a, the difference signal (X1-X2) of 21b becomes the gain alpha of fixed value A and this gain alpha is multiplied by and signal (X1+X2) and be made as the situation of the output identical with formula (1), but instead, also can be that operational part 12 possesses control part, this control part control Magnetic Sensor (21a, input value 21b) makes Magnetic Sensor (21a, difference signal (X1-X2) 21b) becomes fixed value A, operational part 12 is by the Magnetic Sensor (21a carrying out after this control, exporting as being equivalent to the output of Xo with signal 21b), in addition, also can be that operational part 12 possesses correction unit, this correction unit is proofreaied and correct Magnetic Sensor (21a, output valve 21b) makes Magnetic Sensor (21a, difference signal (X1-X2) 21b) becomes fixed value A, operational part 12 is by this Magnetic Sensor (21a carrying out after this correction, exporting as being equivalent to the output of Xo with signal 21b).
In addition, can also realize and possess position detecting device of the present utility model and be transfused to the electronic equipment from the autofocus mechanism of the output signal of this position detecting device.In addition, autofocus mechanism can also be applied to the autofocus mechanism of portable terminal.
As mentioned above, according to the utility model, be provided with the position detection part that the relative position of the magnet in the scope of the displacement to be present in regulation with respect to the reference position of magnet detects, specifically, by be made as ± 0.30mm of the displacement of magnet, the impact being caused by the deviation of the distance of magnet and Magnetic Sensor thus diminishes, even if therefore produce when mounted deviation in the distance (Z-direction) of magnet and Hall element, also can suppress the impact on position detection accuracy, become easy thereby make to install.
Claims (13)
1. a position detecting device, possess the magnet configuring in mobile mode freely and at least two Magnetic Sensors that configure along the moving direction of this magnet, detect the relative position of above-mentioned magnet according to the output of this Magnetic Sensor, this position detecting device is characterised in that
Possesses position detection part, this position detection part is according to the result obtaining divided by the signal from an above-mentioned Magnetic Sensor and the difference signal of the signal from above-mentioned another Magnetic Sensor with signal of the signal of a Magnetic Sensor from above-mentioned Magnetic Sensor and signal from another Magnetic Sensor, detect the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet
The moving range of above-mentioned magnet for from said reference position ± scope below 0.30mm.
2. position detecting device according to claim 1, is characterized in that,
Above-mentioned magnet is that the N utmost point and the S utmost point are distributed in the magnet on moving direction.
3. position detecting device according to claim 1, is characterized in that,
Above-mentioned Magnetic Sensor is sealing into an encapsulation integratedly.
4. position detecting device according to claim 1, is characterized in that,
Above-mentioned Magnetic Sensor does not possess the magnetic chip for carrying out magnetic amplification.
5. position detecting device according to claim 1, is characterized in that,
Above-mentioned Magnetic Sensor is the Hall element with the III-V compound semiconductor of GaAs, InAs or InSb.
6. position detecting device according to claim 1, is characterized in that,
Above-mentioned Magnetic Sensor is the semi-conductive Hall element of IV family with Si or Ge.
7. position detecting device according to claim 1, is characterized in that,
Above-mentioned position detection part possesses the AD transducer that the output of above-mentioned Magnetic Sensor is carried out to AD conversion, detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of this AD transducer.
8. position detecting device according to claim 1, is characterized in that,
Above-mentioned position detection part possesses operational part and test section, and this operational part carries out the computing divided by above-mentioned difference signal of above-mentioned and signal, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of above-mentioned operational part.
9. position detecting device according to claim 1, is characterized in that,
Above-mentioned position detection part possesses operational part and test section, this operational part computing makes above-mentioned difference signal become fixing gain coefficient, go forward side by side and be about to this gain coefficient and above-mentioned and computing signal multiplication, this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to the output of above-mentioned operational part.
10. position detecting device according to claim 1, is characterized in that,
Above-mentioned position detection part possesses control part and test section, it is fixing that the input value of the above-mentioned Magnetic Sensor of this control part control becomes the difference signal of above-mentioned Magnetic Sensor, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to what carry out above-mentioned Magnetic Sensor after this control with signal.
11. position detecting devices according to claim 1, is characterized in that,
Above-mentioned position detection part possesses correction unit and test section, it is fixing that the output valve that this correction unit is proofreaied and correct above-mentioned Magnetic Sensor becomes the difference signal of above-mentioned Magnetic Sensor, and this test section detects the relative position of the reference position with respect to above-mentioned magnet of above-mentioned magnet according to what carry out above-mentioned Magnetic Sensor after this correction with signal.
12. 1 kinds of electronic equipments, is characterized in that possessing: position detecting device according to claim 1 and autofocus mechanism, this autofocus mechanism is transfused to the output signal from this position detecting device.
13. electronic equipments according to claim 12, is characterized in that,
Above-mentioned autofocus mechanism is the autofocus mechanism of portable terminal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-277325 | 2012-12-19 | ||
| JP2012277325 | 2012-12-19 | ||
| JP2013057053 | 2013-03-19 | ||
| JP2013-057053 | 2013-03-19 |
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| Publication Number | Publication Date |
|---|---|
| CN203744911U true CN203744911U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320844296.6U Expired - Fee Related CN203744911U (en) | 2012-12-19 | 2013-12-19 | Position detecting device and electronic device using the position detecting device |
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| Country | Link |
|---|---|
| CN (1) | CN203744911U (en) |
| TW (1) | TWM475613U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109416451A (en) * | 2016-06-29 | 2019-03-01 | 微软技术许可有限责任公司 | Camera is split to be automatically aligned to |
| CN109631747A (en) * | 2017-10-06 | 2019-04-16 | 爱信精机株式会社 | Rotation angle detection apparatus for vehicle brake |
| CN112033254A (en) * | 2019-06-03 | 2020-12-04 | 西安铁路信号有限责任公司 | Device and method for detecting position of linear reciprocating motion part |
-
2013
- 2013-10-31 TW TW102220327U patent/TWM475613U/en not_active IP Right Cessation
- 2013-12-19 CN CN201320844296.6U patent/CN203744911U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109416451A (en) * | 2016-06-29 | 2019-03-01 | 微软技术许可有限责任公司 | Camera is split to be automatically aligned to |
| CN109631747A (en) * | 2017-10-06 | 2019-04-16 | 爱信精机株式会社 | Rotation angle detection apparatus for vehicle brake |
| CN112033254A (en) * | 2019-06-03 | 2020-12-04 | 西安铁路信号有限责任公司 | Device and method for detecting position of linear reciprocating motion part |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM475613U (en) | 2014-04-01 |
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