CN101285988A - Minisize pick-up head module displacement sensor - Google Patents
Minisize pick-up head module displacement sensor Download PDFInfo
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- CN101285988A CN101285988A CNA2007100393208A CN200710039320A CN101285988A CN 101285988 A CN101285988 A CN 101285988A CN A2007100393208 A CNA2007100393208 A CN A2007100393208A CN 200710039320 A CN200710039320 A CN 200710039320A CN 101285988 A CN101285988 A CN 101285988A
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Abstract
The invention provides a mini-typed camera module displacement sensor, which is arranged on a lens driver of a small portable terminal camera device and senses the position change of the driver; the driver comprises a motion part which carries out movement and comprises a lens component composed of a plurality of lens at the internal central position, a motion part electrode which is formed on one surface at the external side of the motion part and is fixed on a drawtube part which wraps the motion part from the external side and supports the motion part to move, a fixed part electrode array which consists of a plurality of fixed part electrodes which are opposite to the motion part electrodes and respectively and intermittently arranged on one surface at the internal side of the drawtube part, dielectrics which are flatly plated on a plurality of fixed plane electrodes, and leads which are connected with the motion part electrodes and the fixed part electrode array and are led out. The capacitance generated by the fixed part electrode array and the dielectrics are sensed according to the movement when the motion part electrode contacts the dielectric, and the displacement of the motion part is measured by the peripheral circuit connected on the leads.
Description
Technical field
The present invention is included within the lens driver, helps the small portable terminating machine to realize the minisize pick-up head module displacement sensor of focusing (AutoFocusing) automatically and optical zoom (Zooming) function.
Background technology
In recent years, follow the continuous development of mechanics of communication and digital information processing, the functions such as input and output of collection information processing and calculation, communication, image information are that portable terminal machine technology all over the body also rises gradually.For example: it all is this series products that the PDA of digital vedio recording and communication function, the mobile phone that has added digital camera function, personal multimedia player (PMP:personal multi-media player) etc. have been installed.Because digital vedio recording technology and information storage capacity is in continuous development, the installation of high level digital vedio recording head module (digital camera module) is being tending towards generalizing, meanwhile, the development of all kinds of technology makes the digital vedio recording head module on the equipment such as being installed in portable terminal computer bring into use mega pixel (mega pixel) level other imageing sensor (imagesensor), therefore additional functions such as focusing and optical zoom more and more are subjected to people's attention automatically, and the geomery of camera module (form-factor) then more and more is tending towards miniaturization.
In order in this type of small-sized digital vedio recording head module, to realize autozoom and optical zoom function, people researching and developing use can carry out the driver that rotatablely moves of similar step motor make moving component be technology that wire moves and more simply, voice coil motor (VCM, voice coil motor) the type of drive technology of easier realization miniaturization and with its commercialization.In order to realize optical zoom function and automatic focus function, the plural lens set that is assembled in camera module inside with moving component can be respectively along with moving component moves to assigned address, and the light of coming in is so just gone up at imageing sensor (image sensor) and formed image.
Step motor can only be remembered initial position, is to rely on the driving pulse electric current of connecting that the position is regulated during owing to driving, so this type of motor does not have the position sensor that can judge moving component (moveable part) displacement in fact.But, development trend along with miniaturization, in the driver of the displacement error that linear electromagnetic driver of similar step motor, voice coil motor etc. (electromagnetic linear actuator) or piezoelectric actuator uses such as (piezoelelectric actuator) must occur accumulating when driving, in order to ensure automatic focusing and the optical zoom that needs accurate control, just need to install the position transducer that can detect the moving component position.
The activation point sensor of moving component generally is usually used in robot engineering technology and has obtained significant progress in this field, and it not only can calculate, and straight line moves, rotation angle and displacement, but also can calculate velocity information.Existing infrared ray (infrared), resistance (resistive), electric capacity (capacitive), the magnetic (magnetic), the mode of Hall element several different methods perceptive object positions such as (hall sensor) utilized.
Wherein, the capacitive displacement detecting sensor can the variation that electric field brings occur between the sensing electrode, the electrode formation that highlights from the loop, capacitance is decided by the area of electric field, interelectrode distance and the factors such as position between electrode, therefore is enough to detect 10
-15Capacitance about F.Its detection sensitivity is higher, can detect trickle capacitance variations, can also carry out range and detect.What it utilized is the electric field that electrode voltage produces, so can produce capacity of decomposition by the diffusion of electric field.Because under different situations, interelectrode interval can number mm to below several μ m near switching range in work, so be also referred to as capacitive approach switch.
Though optical zoom function also needs to possess the such continuous vari-focus function of similar existing unlimited shooting (camcorder), really only need carry out zoom simply stage by stage in some cases.Such as the zoom of picture digital camera, only need determine that the relevant position is just passable according to different multiples such as 2 times, 3 times, 4 times, shooting mobile phone also carries out displacement according to different phase.In this case, just need and easy detection to go out the position detection sensor of each stage position,, just can detect the displacement situation as long as can detect the specific capacitance values of each assigned position.
Yet, along with portable terminal computer constantly is tending towards miniaturization, the camera module volume that it is installed is also more and more littler, meanwhile also require accurately to realize focusing and zoom function automatically, this just need develop a kind of can be under the prerequisite that guarantees smaller size smaller the technology of accurate perception camera module shift in position.
Summary of the invention
The present invention proposes for addressing the above problem just, its purpose is to provide a kind of can easyly be installed in the micro drives apparatus inside that utilizes electromagnetic mode, the minisize pick-up head module displacement sensor of automatic focusing of the portable camera of the miniaturization that meets the requirements and camera terminal machine and zoom function.
Another object of the present invention is to provide a kind of only lens set positional information required when the displacement situation by each stage in the portable terminal computer realizes focusing automatically and zoom function, with the minisize pick-up head module displacement sensor of the shooting image quality that guarantees the acquisition high-resolution.
To achieve these goals, the present invention is as being provided on the small portable terminating machine cam device lens driver, the minisize pick-up head module displacement sensor that the above-mentioned drive location of perception changes, possess following features: above-mentioned driver is included in the central interior position and comprises Lens assembly that is made of a plurality of eyeglasses and the moving component that moves, be fixedly mounted on the lens barrel parts that encase above-mentioned moving component from the outside and support the above-mentioned small portable terminating machine inside that above-mentioned moving component moves, be included in the more than one moving component electrode that forms on the face in the above-mentioned moving component outside, resist the fixed part electrod-array that above-mentioned moving component electrode is formed according to a plurality of fixed part electrodes of predetermined space arrangement on the face in the inboard of above-mentioned lens barrel parts, flat be coated in the dielectric on above-mentioned a plurality of fixed part electrode and be connected to above-mentioned moving component electrode and said fixing parts electrod-array on and export to outside lead, contact mobile that above-mentioned dielectric takes place according to above-mentioned moving component plane electrode, the electric capacity that perception said fixing parts electrod-array and above-mentioned dielectric produce utilizes the peripheral loop that is connected on the above-mentioned lead to measure the displacement of above-mentioned moving component.
Effect of the present invention:
As mentioned above, minisize pick-up head module displacement sensor of the present invention is the capacitive displacement detecting sensor, compare with other sensor forms, it has can be according to advantages such as different phase perception displacement, impact and the vibrations of zoom function are not too responsive, size sensor is less.
As regulating the optical profile type camera lens displacement detecting apparatus of focusing and amplification subject etc. automatically, when detent linear when mobile, the detecting sensor of camera inside just can be exported and accurate each stage of perception and the corresponding electric power signal of correspondence position, thus the automatic focusing and the optical zoom function of realizing ideal.
As a kind of little power consumption, be easy to realize miniaturization, be applicable to and require accurately to judge and the displacement detecting sensor of the various machines of controlled motion component locations, especially can be used for perception is intended to realize to be installed in the zoom of the minisize pick-up head module on the portable terminal computer etc. and the lens set displacement situation of focus function automatically.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
(a) among Fig. 1 is the oblique view of showing the example of linear driver that displacement detecting sensor of the present invention is installed;
(b) among Fig. 1 is the amplification sectional view in the A cross section of (a) in the exploded view 1;
(a) among Fig. 2 is the exemplary plot that the working condition to displacement detecting sensor of the present invention describes to (j);
Fig. 3 a to Fig. 3 d is the exemplary plot that the principle of work to displacement detecting sensor of the present invention describes.
The symbol description of major part in the accompanying drawing:
10: driver 11: the lens barrel parts
12: moving component 13: the fixed part electrod-array
14: moving component electrode 15: through hole
16: dielectric 17: substrate
31: capacitance-voltage converter 32: comparer
Embodiment
Embodiment to minisize pick-up head module displacement sensor of the present invention is elaborated below with reference to accompanying drawings.
To be applied to condenser type of the present invention (capacitive type) displacement detecting sensor on any one linear driver during explanation.This is one of them embodiment, and the present invention also can suitably be applied on other lens driver.
(a) among Fig. 1 is the oblique view of showing 10 1 examples of linear driver that displacement detecting sensor 15 of the present invention is installed; (b) among Fig. 1 is the amplification sectional view in the A cross section of (a) in the exploded view 1.
At first, as shown in Figure 1, though linear driver 10 is voice coil motor modes, but be to have used mode such as piezoelectricity when driving, be about to install the moving component 12 of the inboard central through hole 15 of Lens assembly (not shown) by outfit, be used for realizing moving component 12 linear mobile lens barrel parts 11, the fixed part electrod-array 13 that is fixed on lens barrel parts 11 inner sides and forms according to a plurality of fixed part electrodes that certain interval separates, relative with fixed part electrod-array 13 the outstanding moving component electrode 14 that forms on 12 1 sides of moving component and be connected to fixed part electrod-array 13 and moving component electrode 14 on lead formations such as (not shown).
Attached to the fixed part electrod-array 13 on lens barrel parts 11 1 medial surfaces and relative attached to the moving component electrode 14 on moving component 12 1 sides, scribbled electric material on the fixed part electrod-array 13, promptly dielectric 16.
Fixed part electrod-array 13 is that a plurality of electrodes of certain width are according to the form of certain intervals stationary arrangement at 11 1 medial surfaces of lens barrel parts, because the resolution (resolution) that the width of the moving component electrode of claiming on fixed part electrod-array 13 and the moving component 12 14 and displacement are surveyed is closely related, photoetching flow process in the middle of the width of the moving component electrode 14 that forms on fixed part electrod-array 13 and the moving component just can utilize semiconductor process flows is such as regulating width in the specified scope playing from 1 μ m.
Moving component electrode 14 directions are relative with fixed part electrod-array 13, outstanding forming on a side of moving component 12, moving component electrode 14 is identical with fixed part electrod-array 13 each electrode wide cuts or also may have the wide cut of designated length respectively.The length of moving component electrode 14 is also identical with fixed part electrod-array 13 or have the length of appointment respectively.
Dielectric 16 is flat to be coated on the substrate fixed part electrod-array 13 to cover on the substrate 17, and joins with the moving component electrode 14 of moving component 12.The effect of dielectric 16 is to move under the dielectric 16 contacted states of moving component 12 electrodes and fixed part, with capacitor of electrod-array 13 formation of fixed part, thereby makes the detection of electric capacity be more prone to.
In addition, dielectric 16 adopts be can be fine the material of issuable wearing and tearing etc. during the antagonism contact, can in the silicon nitride of pottery series, carborundum, aluminium oxide, zirconia etc., select, by applying and the sputter technology is made.
Shown in Figure 2 as (a) A cross section in the exploded view 1, the moving component electrode 14 contact fixed part dielectrics of moving component 12 move, and detect electric capacity, its course of work as (a) among Fig. 2 to shown in (j).
Fig. 2 is the exemplary plot of showing an example of moving component 12 working conditions.It has showed that be relatively fixed parts electrod-array 13 and moving component electrode 14 are according to the superpose process of (overlap) of different shift positions.
Fig. 3 a shows that detection moving component electrode 14 shown in Figure 2 moves the chart that produces capacitance, has showed the variation of capacitance under each shift position among Fig. 2.
In the chart of Fig. 3 a, shown in (a) position, electric capacity did not maintain on the certain level when fixed part electrod-array 13 and moving component electrode 14 produced the stack parts; Shown in (b) position, the moment electric capacity of fixed part electrod- array 13 and 14 stacks of moving component electrode rises; Shown in (c) position, when both were superimposed fully, electric capacity reached mxm.; Shown in (d) position, along with the stack area of fixed part electrod-array 13 and moving component electrode 14 constantly dwindles, detected electric capacity also constantly reduces.
As implied above, testing process takes place repeatedly, and consequent capacitance detecting chart has showed that with each electrode that lays respectively at fixed part electrod-array 13 assigned addresses be benchmark shown in Fig. 3 a, along identical output chart of the cycle that the x direction of principal axis moves.
Detected capacitance variations waveform can occur trapezoidal or the triangle probing wave by the decision of moving component electrode 14 wide cut sizes.Capacitance is converted to voltage (Vout) output by electric capacity (the C)-electric pressure converter 31 shown in Fig. 3 c.
At this moment, in order to realize zoom function continuously, such as the positional information that only need obtain with 2 times of zooms, 3 times of zooms, 4 times of corresponding each positions of zoom, in order to detect and 2 times of zooms, 3 times of zooms, 4 times of corresponding positional informations of zoom, the positional information that can use the respectively corresponding 2 times of zooms of position ((c) position that is equivalent to Fig. 3 a) conduct that are equivalent to output voltage (Vout) mxm., 3 times of zooms, 4 times of zooms is surveyed in the displacement of moving component 12.
In addition, shown in Fig. 3 d, use 32 pairs of specified value voltages of comparer (Vi) and output voltage (Vout) to compare, just can obtain with when the position ((d) of corresponding diagram 3b, (i)) of output voltage (Vout) from transferring to more greatly hour, perhaps output voltage (Vout) from the corresponding positional information in position (corresponding diagram 3b (h)) that transfers to more greatly hour as the positional information that is equivalent to 2 times of zooms, 3 times of zooms, 4 times of zooms.
Particularly, shown in Fig. 3 b, if being set at 2 times of zoom positions with the corresponding position d of the d1 of x axle, being set at 3 times of zoom positions with the corresponding position of d2 (j), whether the comparer 32 contrast detected output voltages (Vout) of use shown in Fig. 3 d are and position (d) corresponding output voltage, if not with position (d) corresponding output voltage, so just its voltage difference is detected.At this moment, this voltage difference means that the displacement of this difference size has taken place moving component 12, exports the output voltage (Vout) that is equivalent to position (d) by the effect of control assembly (not shown), has just realized position control.
Utilize the positional information that obtains by output voltage (Vout) or comparer 32, moving component 12 will move to correct position through the interval of convergence by circuit feedback.
In addition, when each phase displacement of setting according to the number of fixed part electrod-array 13 each electrodes moves, can survey waveform according to each, promptly peaked number moves to the electrode position of appointment.Therefore, the displacement information that can utilize the peaked output voltage values of respective detection to obtain each zoom stage line position of going forward side by side is regulated.
In addition, by analog output, rather than by making drive surface electrod-array wide cut relatively greater than stationary plane electrod-array wide cut, lens set is regulated the area of comparative electrode when driving, and measures the what is called " signal output stage by stage " of displacement by the increase and decrease of electric capacity and also can carry out position adjustments.
Utilize this type of capacitive displacement detecting sensor can be in small portable terminating machine optical zoom function accurately the perception lens set in the displacement in each stage, thereby guarantee the location aware technology of Digital Zoom function, can also regulate the electrode wide cut and perceive comparatively accurate focus function position automatically.This capacitive position detecting sensor can easily be worked in micro drives apparatus inside, is the position transducer that can detect precise motion part displacements information, makes very easy.
By above-mentioned explanation, those skilled in the art can carry out various change and modification fully in the scope that does not depart from the technology of the present invention thought.But, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating purpose of the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (9)
1, a kind of minisize pick-up head module displacement sensor is to be provided on the small portable terminating machine cam device lens driver, and the displacement detecting sensor in order to the above-mentioned drive location of perception changes is characterized in that above-mentioned driver comprises:
Comprise Lens assembly that constitutes by a plurality of eyeglasses and the moving component that moves in the central interior position;
Be fixedly mounted on the lens barrel parts that encase above-mentioned moving component from the outside and support the above-mentioned small portable terminating machine inside that above-mentioned moving component moves;
Be included in the more than one moving component electrode that forms on the face in the above-mentioned moving component outside;
Resist the fixed part electrod-array that above-mentioned moving component electrode is formed according to a plurality of fixed part electrodes of predetermined space arrangement on the face in the inboard of above-mentioned lens barrel parts;
The flat dielectric that is coated on the said fixing parts electrode; And
Be connected on above-mentioned moving component electrode and the said fixing parts electrod-array and export to outside lead;
Contact mobile that above-mentioned dielectric takes place according to above-mentioned moving component electrode, the electric capacity that perception said fixing parts electrod-array and above-mentioned dielectric produce utilizes the peripheral loop that is connected on the above-mentioned lead to measure the displacement of above-mentioned moving component.
2, minisize pick-up head module displacement sensor as claimed in claim 1 is characterized in that:
What above-mentioned displacement detecting sensor was taked is that described fixed part electrod-array utilizes and the corresponding capacitance detecting in position, can realize the design of each stage numeral output or simulation output.
3, minisize pick-up head module displacement sensor as claimed in claim 1 is characterized in that:
The width of above-mentioned a plurality of fixed part electrodes is determined that by the size of above-mentioned lens barrel parts and the degree of accuracy of above-mentioned displacement detecting the width of each electrode of above-mentioned a plurality of fixed part electrodes is identical with the width of above-mentioned moving component plane electrode.
4, minisize pick-up head module displacement sensor as claimed in claim 1 is characterized in that:
What above-mentioned dielectric adopted is the lost material that contact brought that can resist above-mentioned moving component electrode, and selects a kind of material to make in silicon nitride or carborundum or aluminium oxide or zirconia.
5, minisize pick-up head module displacement sensor as claimed in claim 1 is characterized in that:
Above-mentioned peripheral loop comprises the capacitance-voltage converter, said sensed to electric capacity be converted to output voltage and export.
6, minisize pick-up head module displacement sensor as claimed in claim 5 is characterized in that:
Each set positions of the above-mentioned output voltage mxm. of output is the zoom multiple established or the position of each subject focus.
7, minisize pick-up head module displacement sensor as claimed in claim 6 is characterized in that:
The number that moves the above-mentioned output voltage mxm. that is brought of above-mentioned moving component electrode is detected altogether the displacement information of above-mentioned moving component electrode.
8, minisize pick-up head module displacement sensor as claimed in claim 5 is characterized in that:
Above-mentioned peripheral loop also comprises comparer, and the above-mentioned output voltage through above-mentioned capacitance-voltage converter output is compared with the normal voltage of having set, and exports the poor of above-mentioned output voltage and above-mentioned normal voltage as displacement information.
9, as the described minisize pick-up head module displacement sensor of claim item, it is characterized in that:
Each shift position of above-mentioned moving component electrode of the above-mentioned normal voltage of output is set at the zoom multiple set or the position of each subject focus.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100393208A CN101285988A (en) | 2007-04-10 | 2007-04-10 | Minisize pick-up head module displacement sensor |
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| CNA2007100393208A CN101285988A (en) | 2007-04-10 | 2007-04-10 | Minisize pick-up head module displacement sensor |
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| CN101285988A true CN101285988A (en) | 2008-10-15 |
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| CNA2007100393208A Pending CN101285988A (en) | 2007-04-10 | 2007-04-10 | Minisize pick-up head module displacement sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829911A (en) * | 2012-08-09 | 2012-12-19 | 北京豪仪测控工程有限公司 | Pumping unit dynamometer |
| CN108710251A (en) * | 2018-04-20 | 2018-10-26 | 广景视睿科技（深圳）有限公司 | A kind of Atomatic focusing method, device and projecting apparatus |
| CN110068356A (en) * | 2018-01-23 | 2019-07-30 | 上海三菱电梯有限公司 | Door absolute position detecting device |
| CN112153271A (en) * | 2019-06-27 | 2020-12-29 | Oppo广东移动通信有限公司 | Control method and control device for optical lens of electronic equipment and storage medium |
| CN112531981A (en) * | 2020-12-14 | 2021-03-19 | 基合半导体（宁波）有限公司 | Anti-shake motor, closed-loop control method for anti-shake motor, and image pickup apparatus |
| CN112600360A (en) * | 2020-12-14 | 2021-04-02 | 基合半导体（宁波）有限公司 | Focusing motor, closed-loop control method of focusing motor and camera equipment |
| WO2021088236A1 (en) * | 2019-11-05 | 2021-05-14 | 广景视睿科技（深圳）有限公司 | Focusing assembly control method and apparatus, focusing assembly, and projector |
| CN113523836A (en) * | 2021-06-10 | 2021-10-22 | 上海铂世光半导体科技有限公司 | Wear-resistant conductive diamond positioner |
-
2007
- 2007-04-10 CN CNA2007100393208A patent/CN101285988A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829911A (en) * | 2012-08-09 | 2012-12-19 | 北京豪仪测控工程有限公司 | Pumping unit dynamometer |
| CN110068356A (en) * | 2018-01-23 | 2019-07-30 | 上海三菱电梯有限公司 | Door absolute position detecting device |
| CN110068356B (en) * | 2018-01-23 | 2021-08-03 | 上海三菱电梯有限公司 | Door absolute position detection device |
| CN108710251A (en) * | 2018-04-20 | 2018-10-26 | 广景视睿科技（深圳）有限公司 | A kind of Atomatic focusing method, device and projecting apparatus |
| CN112153271A (en) * | 2019-06-27 | 2020-12-29 | Oppo广东移动通信有限公司 | Control method and control device for optical lens of electronic equipment and storage medium |
| CN112153271B (en) * | 2019-06-27 | 2022-05-20 | Oppo广东移动通信有限公司 | Control method and control device for optical lens of electronic equipment and storage medium |
| WO2021088236A1 (en) * | 2019-11-05 | 2021-05-14 | 广景视睿科技（深圳）有限公司 | Focusing assembly control method and apparatus, focusing assembly, and projector |
| CN112531981A (en) * | 2020-12-14 | 2021-03-19 | 基合半导体（宁波）有限公司 | Anti-shake motor, closed-loop control method for anti-shake motor, and image pickup apparatus |
| CN112600360A (en) * | 2020-12-14 | 2021-04-02 | 基合半导体（宁波）有限公司 | Focusing motor, closed-loop control method of focusing motor and camera equipment |
| CN112531981B (en) * | 2020-12-14 | 2023-04-07 | 基合半导体（宁波）有限公司 | Anti-shake motor, closed-loop control method for anti-shake motor, and image pickup apparatus |
| CN113523836A (en) * | 2021-06-10 | 2021-10-22 | 上海铂世光半导体科技有限公司 | Wear-resistant conductive diamond positioner |
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