CN101266388A - Minisize pick-up head module displacement sensor - Google Patents
Minisize pick-up head module displacement sensor Download PDFInfo
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- CN101266388A CN101266388A CNA2007100380956A CN200710038095A CN101266388A CN 101266388 A CN101266388 A CN 101266388A CN A2007100380956 A CNA2007100380956 A CN A2007100380956A CN 200710038095 A CN200710038095 A CN 200710038095A CN 101266388 A CN101266388 A CN 101266388A
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Abstract
A small-sized camera head module displacement sensor is disclosed. The lens driver of the displacement sensor is composed of a moving component which has a plurality of glasses lens in the internal central location; a fixed resistor guide member which has a resistor passing through at least one side of the moving component; a lens cone covering the moving component and the fixed resistor guide member; and a base which supports the moving component and the fixed resistor guide member and is equipped with lens in the internal central location. The moving component moves along with the lens cone and the fixed resistor guide member. The lens driver of the displacement sensor also includes a connecting lead member connected with more than one fixed resistor guide member, contact materials locating at both sides of the connecting lead member and contacting with the fixed resistor guide member, and a circuit connecting the fixed resistor guide members. The connecting lead member and the contact materials move along with the movement of the fixed resistor guide member, so as to percept and lead-out the displacement of the moving component. The invention is a displacement sensor with accurate displacement, simple and convenient manufacturing and low price.
Description
Technical field
The invention relates to and focus automatically (Auto Focusing) in miniature mobile terminal device inside and the invention of the lens driving apparatus inner part displacement sensor of optical zoom (Zooming).
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 the product that this type of technology of utilization is produced 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 (digitalcamera 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 (image sensor), therefore additional functions such as focusing and optical zoom more and more are subjected to people's attention automatically, and it is microminiaturized that the size of camera module then more and more is tending towards.
In order in this type of miniature 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, realize microminiaturized voice coil motor (VCM, voice coil motor) type of drive technology and easilier with its commercialization.Step motor can only be remembered primary position, relies on the driving pulse electric current 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 microminiaturization, 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 (piezoel electric 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 it not only can calculate, and straight line moves, rotation angle and displacement, and can also calculate velocity information by structure.The existing infrared ray (infrared) that utilizes, resistance (resistive), electric capacity (capacitive), magnetic (magnetic), the mode of Hall element several different methods perceptive object positions such as (hall sensor), and the detection part changes in resistance of having developed by becoming ratio with the moving component position is converted to the potentiometer (potentiometer) of variable voltage to positional information, being converted to the linear change differential transformer position sensors such as (linaer variabledifferential transformer) that aanalogvoltage is exported according to mechanical connection in the position result that the move distance of the magnetic core of moving component determines.
Yet, along with the size of portable terminal computer is constantly dwindled, just require to develop can be in the automatic focusing of the camera module on being installed in this type of portable terminal computer and optical zoom function the accurate position of perception lens set and successfully carry out the technology of position control.
Summary of the invention
The present invention proposes for addressing the above problem just, its purpose just is to provide a kind of minisize pick-up head module displacement sensor, it is not only applicable to utilize the Driving technique of existing module, but also can be installed in the such micro drives apparatus inside of similar voice coil motor easily, be fit to require microminiaturized portable camera and the automatic focusing of camera shooting terminal machine and the displacement transducer of zoom function.
To achieve these goals, the present invention comprises the minisize pick-up head module displacement sensor of the lens driver change in location of corresponding lens set as being used for perception in the optical zoom of small portable terminating machine camera apparatus and the automatic focus function, have following features: above-mentioned driver is by the moving component that possesses a plurality of eyeglasses in the bosom position, the fixed resister guide parts of forming by the resistor that connects more than above-mentioned moving component one side, the lens barrel that above-mentioned moving component and said fixing resistor guide parts are fenced up and support above-mentioned lens barrel and said fixing resistor guide parts and the base that is equipped with eyeglass in the bosom position constitute, above-mentioned moving component is along with said fixing resistor guide parts and above-mentioned lens barrel move, also comprise the connection wire guiding member that is intended to connect the electric power between the above-mentioned above fixed resister guide parts, be positioned at above-mentioned connection conductor part two ends and with the contacted contact material of said fixing resistor guide parts and be connected on the above-mentioned above guide parts and be positioned at circuit external, above-mentioned connection wire guiding member and above-mentioned contact material are along with moving together of said fixing resistor guide parts moved, thus the displacement of perception and derivation moving component.
In addition, to achieve these goals, the present invention is as a kind of small portable terminating machine camera dress lens driver inside that is installed in, be used for the minisize pick-up head module displacement sensor that the above-mentioned drive location of perception changes, also have following feature: above-mentioned driver is by the moving component that possesses a plurality of eyeglasses in the bosom position, the fixed resister guide parts of forming by the resistor that connects more than above-mentioned moving component one side, the lens barrel that above-mentioned moving component and said fixing resistor guide parts are fenced up and support above-mentioned lens barrel and said fixing resistor guide parts and the base that is equipped with eyeglass in the bosom position constitute, above-mentioned moving component is along with said fixing resistor guide parts and above-mentioned lens barrel move, also comprise and the contacted contact material of said fixing resistor guide parts, the 1st lead that is connected with above-mentioned contact material, be connected and export to the 2nd outside lead on the said fixing resistor guide parts and be connected on above-mentioned the 1st lead and the 2nd lead and be positioned at outside parts such as detection line, above-mentioned the 1st lead and above-mentioned contact material are along with moving together of said fixing resistor guide parts moved, thus the displacement of perception and derivation moving component.
Effect of the present invention:
As mentioned above, minisize pick-up head module displacement sensor of the present invention can be in the inner accurately perception of the minitype portable terminating machine position of lens set when focusing and optical zoom operation automatically, thereby the displacement transducer that can detect accurate displacement information is provided.
In addition, still the microminiaturized product that is applicable to the microminiaturized trend that meets camera module provided by the present invention, particularly be exactly to utilize simple resistance mode displacement transducer, by the slight change of voltage form output variable resistor, make easy, cheap displacement transducer.
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 that is used for installing the linear driver of displacement transducer of the present invention;
(b) among Fig. 1 is the sectional view that is used for installing the linear driver of displacement transducer of the present invention;
(a) among Fig. 2 is intended to the illustration that the displacement transducer principle to one embodiment of the invention describes to (d).
(a) among Fig. 3 and (b) be intended to the illustration that the displacement transducer principle to another embodiment of the present invention describes.
The symbol description of major part in the accompanying drawing:
20: driver 21: lens barrel
22: moving component 23: fixed resister guide parts
24: base 25: through hole
31: connect wire guiding member 32,42: contact spring
44: the 2 leads of 41: the 1 leads
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 resistance mode displacement transducer of the present invention 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 that is used for installing the linear driver 20 of displacement transducer of the present invention;
(b) among Fig. 1 is the sectional view that is used for installing the linear driver 20 of displacement transducer of the present invention.
At first, as shown in Figure 1, as an embodiment of the linear driver 20 of the minisize pick-up head module that is used for installing displacement transducer of the present invention, linear driver 20 is by having installed on the modes such as being used for voice coil motor or piezoelectricity at central unit and moving component 22, the lens barrel 21 that is used for realizing moving component 22 linear motions, the resistor-fixed resister guide parts 23 of the Lens assembly (not shown) that a plurality of eyeglasses that driven by reality constitute and through hole 25, base 24 etc. that eyeglass is housed are partly formed.
Such as, in the voice coil motor mode, to around coil winding (not shown) turn-on current of lens barrel 21 outsides the time, along with lens barrel 21 and guide parts 23 are done moving of above-below direction, its moving direction is restricted 22 meetings of moving component under the effect of electromagnetic field that coil winding produces and magnetic (not shown).Lens assembly is fixed on the inside of the moving component 22 that is positioned at lens barrel 21 inside, fixed resister guide parts 23 form resistor, be about to below play an important role in the displacement transducer of the resistance mode mentioned, will be elaborated among each embodiment below about the effect of fixed resister guide parts 23.
Below will be in the Linear actuator of forming by above-mentioned part 20, when comprising lens set when interior moving component 22 is done actual motion along the vertical direction, the composition and the principle of work that are used for the displacement transducer of perceive motion parts 22 positions describe.
(a) among Fig. 2 is intended to the exemplary plot that the displacement transducer principle to one embodiment of the invention describes to (d).The displacement transducer of one embodiment of the invention that Fig. 2 marked is a form of utilizing the Wheatstone bridge principle, is to have added the form that connects wire guiding member 31 and contact spring 32 on the element basis of seeing again in Fig. 1.
Displacement transducer in one embodiment of the invention is furnished with on the moving component 22 that drives along with guide parts 23 and is used for carrying out perfect conductor-contact spring 32 that electric power contacts with guide parts 23, also comprise be fixed on the moving component 22, two ends carry out the connection wire guiding member 31 that electric power is connected with contact spring 32, this connection wire guiding member 31 and contact spring 32 move up and down with moving component 22, thereby make the guide parts have the variable resistor part.
Contact spring 32 is the materials that are used for realizing the electric power contact, thereby is to have the resilient material that fixing elastic force can apply certain contact pressure (contact preload) to fixed resister guide parts 23.Shown in (b) among Fig. 2, contact spring 32 stretches in the contact portion that connects wire guiding member 31 and fixed resister guide parts 23, thereby improve connecting the contact reliability of wire guiding member 31, the engineering properties of contact spring 32 is to need to continue contact, thereby use is friction resistant, the anti abrasive material of the property led entirely.
Thereby, it is according to two fixed resister guide parts 23, the whole resistance values of circuit perception that connect the connection wire guiding member 31 of two fixed resister guide parts 23 and comprise contact spring 32, that is to say, thereby these whole resistance values of perception determine change in location when connecting wire guiding member 31 and contact spring 32 and move up and down along with fixed resister guide parts.
Shown in (b) among Fig. 2, the contact spring 32 that keeps the electric power contact with fixed resister guide parts 23 be connected wire guiding member 31 and be positioned on the moving component 22, along with moving component 22 moves up and down, also change as fixed resister guide parts 23 length of guide.Particularly, two fixed resister guide parts 23 difference corresponding Rb (x), contact spring 32 be connected wire guiding member 31 corresponding Ra, shown in (c) among Fig. 2, along with moving component 22 moves up and down, be used as the length of the guide parts 23 of guide, promptly Rb (x) changes, and variable resistor (Ry) has just become Ry (x)=Ra+2Rb (x).
Utilize variable resistor (Ry) value of using after changing that the slight change of resistance is turned into circuit-Wheatstone bridge (Wheatstone Bridge) circuit that voltage is exported, just can perceive displacement information, its process will be described below.
(d) among Fig. 2 utilizes Wheatstone bridge circuit, and the variable resistor (Ry) that output can use measuring resistance (Rx) and actual perceived to arrive is derived the exemplary circuit of the voltage of displacement information.
If make the resistance (R1) that is positioned at linear driver 20 outsides identical with resistance (R2), when measuring resistance (Rx) is identical with variable resistor (Ry), output voltage (V0) is 0V, when variable resistor (Ry) changed, voltage (V0) was according to the specific output of measuring resistance (Rx) and variable resistor (Ry).Measuring resistance (Rx) is utilized fixed resister guide parts 23 self, in addition, voltage is also exported according to the ratio of measuring resistance on the Wheatstone bridge circuit characteristic (Rx) and variable resistor (Ry), therefore can not be subjected to the influence of variable resistor (Ry) the value change of temperature variation generation.
Determine voltage (V0) value exported above and it is sent to and be positioned at outside control assembly (not shown), control assembly will calculate the initial position and the change location of moving component 22 automatically.
Below will be to the displacement transducer in another embodiment of the present invention-utilize the form of variable resistance type sensor to describe.
As shown in Figure 3, use the inscape of the form of variable-resistance transducer based on (a) among Fig. 1, having added on the moving component 22 that moves along with guide parts 23 provides the perfect conductor contact spring 42 that contacts with fixed resister guide parts 23 electric power.Also contact spring 42 is connected to the 1st lead 41 on the outer detecting circuit (not shown) and is connected on the guide parts 23, also is connected the 2nd lead 44 on the outer detecting circuit simultaneously having comprised.
Displacement transducer as another embodiment of the present invention, the form of use variable resistance type sensor is employed to be following method: the length variations to resistor (R)-guide parts 23 contact springs 42 shown in (a) among Fig. 3 is regarded as variable resistor (Rt), the variable-resistance ratio of resistor (R) is along with the contact point with guide parts 23 and contact spring 42 is that the variation of the fixed resister guide parts 23 front and back length of the benchmark position of being brought changes, thereby output becomes the voltage (V0) of ratio with variable resistor (Rt).
Shown in (a) among Fig. 3, the initial position of moving component 22, for example under the state of contact spring 42 contact fixed resister guide parts 23 upsides, contact spring 42 and the 1st lead 41 can move together along with the downward motion of moving component 22, shown in (b) among Fig. 3, the numerical value of resistor (R) variable resistor (Rt) changes.Like this will be from the corresponding voltage of variable resistor (Rt) (V0) after being arranged in outside testing circuit output and changing, if it is sent to the control assembly (not shown) that is positioned at Linear actuator 20 outsides, control assembly will calculate the position after the variation from the initial position of moving component 22.
In addition, use the displacement transducer of variable resistor (Rt) also can utilize scrambler (encoder) to grasp current location information simultaneously, by the position of feedback (feedback) controlled motion parts 22 by testing circuit.
Displacement transducer as another embodiment of the present invention, what the form of use variable resistance type sensor was used is the relative value of variable resistor (Rt) rate of change that guide parts 23 length variations are brought before and after the contact point, therefore can compensation temperature change resistor (R) heat effects of bringing.
More than the embodiment of the technology of the present invention thought is described in detail, but described embodiment is just in order to help explanation, rather than for invention is limited.Used fixed resister guide parts 23 to make resistor among the present invention without exception, also can use very thin film material simultaneously with same electrical resistance property.
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 (8)
1. minisize pick-up head module displacement sensor is to be used for perception in a kind of optical zoom of small portable terminating machine camera apparatus and the automatic focus function to comprise and it is characterized in that the displacement transducer of the lens driver change in location of corresponding lens set:
Above-mentioned driver comprises:
The moving component that possesses a plurality of eyeglasses in the bosom position;
The fixed resister guide parts of forming by the resistor that connects more than above-mentioned moving component one side;
The lens barrel that above-mentioned moving component and said fixing resistor guide parts are fenced up; And
Support above-mentioned lens barrel and said fixing resistor guide parts and be equipped with the base of eyeglass in the bosom position;
Above-mentioned moving component is along with said fixing resistor guide parts and above-mentioned lens barrel move, also comprise the connection wire guiding member that is intended to connect the electric power between the above-mentioned above fixed resister guide parts, be positioned at above-mentioned connection conductor part two ends and with the contacted contact material of said fixing resistor guide parts and be connected on the above-mentioned above fixed resister guide parts and be positioned at circuit external, above-mentioned connection wire guiding member and above-mentioned contact material are along with moving together of said fixing resistor guide parts moved, thus the displacement of perception and derivation moving component.
2. minisize pick-up head module displacement sensor as claimed in claim 1 is characterized in that:
The displacement of said sensed and derivation moving component is the circuit that utilizes Wheatstone bridge circuit, promptly, measure the variable resistance that above-mentioned more than one fixed resister guide parts, above-mentioned contact material and above-mentioned connection wire guiding member circuit produce, thereby export the above-mentioned voltage that produces with respect to the above-mentioned variable resistance ratio of fixed resister guide component resistance value.
3. minisize pick-up head module displacement sensor as claimed in claim 2 is characterized in that:
Above-mentioned connection wire guiding member and above-mentioned contact material are installed on the above-mentioned moving component, and above-mentioned connection wire guiding member distributes along the camera lens outside that is positioned at above-mentioned moving component central interior position.
4. displacement transducer as claimed in claim 1 is characterized in that:
Above-mentioned contact material is intended to carry out the material of electric power contact, thereby is to have elastic force can apply the resilient material of deciding contact pressure to above-mentioned fixed resister guide parts.
5. minisize pick-up head module displacement sensor is mounted in small portable terminating machine camera dress lens driver inside, is used for the displacement transducer that the above-mentioned drive location of perception changes, and it is characterized in that:
Above-mentioned driver comprises:
The moving component that possesses a plurality of eyeglasses in the bosom position;
The fixed resister guide parts of forming by the resistor that connects more than above-mentioned moving component one side;
The lens barrel that above-mentioned moving component and said fixing resistor guide parts are fenced up; And
Support above-mentioned lens barrel and said fixing resistor guide parts and be equipped with the base of eyeglass in the bosom position;
Above-mentioned moving component is along with said fixing resistor guide parts and above-mentioned lens barrel move, also comprise with the contacted contact material of said fixing resistor guide parts, the 1st lead that is connected with above-mentioned contact material, be connected and export to the 2nd outside lead on the said fixing resistor guide parts and be connected on above-mentioned the 1st lead and the 2nd lead and be positioned at outside detection line, above-mentioned the 1st lead and above-mentioned contact material are along with moving together of said fixing resistor guide parts moved, thus the displacement of perception and derivation moving component.
6. minisize pick-up head module displacement sensor as claimed in claim 5 is characterized in that:
Above-mentioned testing circuit is a benchmark with the contact point of above-mentioned contact material and said fixing resistor guide parts, mensuration is by above-mentioned the 1st lead, the variable resistance of the circuit that above-mentioned contact material and said fixing resistor guide parts are formed changes, and exports the corresponding voltage of above-mentioned variable resistance.
7. as claim 5 or 6 described minisize pick-up head module displacement sensors, it is characterized in that:
Above-mentioned contact material is intended to carry out the material of electric power contact, is to have elastic force, can apply the resilient material of deciding contact pressure to above-mentioned fixed resister guide parts.
8. minisize pick-up head module displacement sensor as claimed in claim 5 is characterized in that:
In the process of the above-mentioned variable-resistance ratio output voltage that utilizes whole relatively resistance, above-mentioned displacement transducer is to utilize said fixing resistor guide parts to carry out the variable resistor type displacement transducer of temperature compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100380956A CN101266388A (en) | 2007-03-15 | 2007-03-15 | Minisize pick-up head module displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100380956A CN101266388A (en) | 2007-03-15 | 2007-03-15 | Minisize pick-up head module displacement sensor |
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| Publication Number | Publication Date |
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| CN101266388A true CN101266388A (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100380956A Pending CN101266388A (en) | 2007-03-15 | 2007-03-15 | Minisize pick-up head module displacement sensor |
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| CN (1) | CN101266388A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323454A (en) * | 2014-07-30 | 2016-02-10 | 光宝电子(广州)有限公司 | Multi-camera image capturing system and image reconstruction compensation method |
| CN108111730A (en) * | 2017-12-25 | 2018-06-01 | 维沃移动通信有限公司 | A kind of camera module, control method and mobile terminal |
-
2007
- 2007-03-15 CN CNA2007100380956A patent/CN101266388A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323454A (en) * | 2014-07-30 | 2016-02-10 | 光宝电子(广州)有限公司 | Multi-camera image capturing system and image reconstruction compensation method |
| CN105323454B (en) * | 2014-07-30 | 2019-04-05 | 光宝电子(广州)有限公司 | Polyphaser image capture system and image reorganization compensation method |
| CN108111730A (en) * | 2017-12-25 | 2018-06-01 | 维沃移动通信有限公司 | A kind of camera module, control method and mobile terminal |
| CN108111730B (en) * | 2017-12-25 | 2020-01-07 | 维沃移动通信有限公司 | Camera module, control method and mobile terminal |
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Open date: 20080917 |