CN104267480A - Control method used for camera module and camera module - Google Patents

Control method used for camera module and camera module Download PDF

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Publication number
CN104267480A
CN104267480A CN201410490636.9A CN201410490636A CN104267480A CN 104267480 A CN104267480 A CN 104267480A CN 201410490636 A CN201410490636 A CN 201410490636A CN 104267480 A CN104267480 A CN 104267480A
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China
Prior art keywords
module
camera lens
coil
lens module
motion
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Granted
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CN201410490636.9A
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Chinese (zh)
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CN104267480B (en
Inventor
赵立新
侯欣楠
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Galaxycore Shanghai Ltd Corp
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Galaxycore Shanghai Ltd Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/65—Control of camera operation in relation to power supply

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)

Abstract

The invention provides a control method for a camera module. The camera module comprises an imaging module, a sleeve module, a camera lens module, at least one coil and at least one magnetic component, wherein the camera lens module is arranged in the sleeve module and can move corresponding to the sleeve module relative to the optical axis direction. The control method includes the steps that the camera lens module is directly or indirectly pressed to the sleeve module in a leaning mod, radial pressure is formed between the camera lens module and the sleeve module, friction force in the optical axis direction is generated between the camera lens module and the sleeve module by the pressure, and the camera lens module is kept in the static state relative to the sleeve module in the optical axis direction due to the friction force; currents are directly provided for the coil by wires, the coil and the magnetic components are selectively matched with the camera lens module, and electromagnetic force in the optical axis direction is borne by the camera lens module and serves as the driving force for the camera lens module to do linear motion in the optical axis direction so as to drive the camera lens module to move.

Description

For control method and the camera module of camera module
Technical field
The present invention relates to the control method for camera module and camera module, wherein, camera module can control direction of motion and the move distance of described lens barrel, realizes the flexible of described lens barrel and/or focus function.
Background technology
Camera module is made up of sensitive chip and imaging lens set, and imaging lens set is placed in the lens barrel of module, and organic cooperation of lens barrel position and sensitive chip could obtain image or the video of high-quality.Modern handheld device, on the one hand in order to needs attractive in appearance are designed to be more and more thinner, the height of camera module is also thereupon more and more lower, corresponding lens set overall height reduces, on the other hand in order to the needs of image quality, the light-sensitive surface Diagonal Dimension of sensitive chip is increasing, how to ensure that the field angle of lens set is constant, strengthen sensitive chip size, and the handheld device appearance design requirement meeting thinner fuselage is the problem of handheld device design industry research always.The especially ultra-thin digital camera of digital camera adopts flexible lens set to solve this problem, the such as isostructural mechanical transmission structure of screw thread/nut structure, gear structure or turbine worm, but such structure is relatively huge, cannot be placed in the thinner equipment such as picture mobile phone, notebook computer, Pad.And the voice coil motor generally used in existing light and thin type equipment, its lens barrel cannot stretch out outside camera module, can only automatic focus be used as, the function that lens set is flexible during work, can not be realized, thus cannot solve the more and more lower and problem brought of above-mentioned camera module height.In addition, existing camera module, make lens barrel remain on certain position, need to continue to coil with electric current to balance elastomeric elastic force, the power dissipation ratio of module is larger, and, lens barrel, when along optical axis direction moving linearly, because optical axis direction lacks guide frame, easily shakes, cause light path eccentric, affect picture quality.
Visible, light and thin type electronic equipment needs a kind of new minisize pick-up head module and solves contradiction between above-mentioned existing module thickness and picture quality, and solve problem existing in existing module, this new camera module can make lens barrel stretch out outside module, ensure under the condition that field angle is constant, strengthen the size of sensitive chip, improve picture quality, claimed structure is simple simultaneously, can be applied in the light and thin type such as mobile phone, pad electronic equipment.
Summary of the invention
In view of the understanding to the technical matters in background technology, if can propose a kind of corresponding control method being suitable for the novel camera module of lightening consumer electronics product and the camera module for this type of, that will be highly profitable.
A first aspect of the present invention proposes a kind of control method of camera module, wherein, described camera module comprises image-forming module, sleeve module, camera lens module, at least one coil, at least one magnetic part that can move relative to optical axis direction corresponding to sleeve module be placed in described sleeve module, and described control method comprises the following steps:
A. described camera lens module is pressed against sleeve module directly or indirectly, wherein, between described camera lens module and sleeve module, there is radial pressure, between described camera lens module and described sleeve module, produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module of described camera lens module keep stationary state in the direction of the optical axis; And
B. passing through wire is directly at least one coil with electric current described, at least one coil described or at least one magnetic part described selectively match with described camera lens module, described camera lens module is subject to the electromagnetic force along described optical axis direction, described electromagnetic force does the driving force of rectilinear motion along described optical axis direction as described camera lens module, move to drive described camera lens module.
In foundation one embodiment of the present of invention, described camera module also comprises: be fixedly connected on the elastomeric element on described camera lens module, and described camera lens module is pressed against in described sleeve module indirectly via elastomeric element.
In foundation one embodiment of the present of invention, in described step b, the electric current passed at least one coil described is pulsed, makes described camera lens module realize noncontinuity motion;
The ratio of the absolute value of the maxima and minima of described pulse current is at least 1.2;
The single pulsewidth of described pulse current is less than 2s.
In foundation one embodiment of the present of invention, in described step b, initial current is passed into at least one coil described, make at least one coil described and at least one magnetic part geo-stationary described, voltage at least one coil described remains the first relation divided by the value of electric current, that is: U/I=R.
In foundation one embodiment of the present of invention, progressively strengthen the size of described initial current, make at least one coil described and at least one magnetic part generation relative motion described, the voltage at least one coil described is caused to be the second relation divided by the value of electric current, i.e. U/I > R; In at least one coil described in detecting, divided by the change of the described first relation generation of the value of electric current, voltage can judge that at least one coil described and at least one magnetic part described there occurs relative motion.
In foundation one embodiment of the present of invention, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial pressure between described camera lens module and sleeve module, at least one coil described, climbing speed, waveform widths, friction factor between described camera lens module and sleeve module; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module.
In foundation one embodiment of the present of invention, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is pressed against pulse current size in the radial pressure of sleeve module, at least one coil described by described elastomeric element, climbing speed, waveform widths, friction factor between described sleeve module and described elastomeric element determine; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module and elastomeric element.
In foundation one embodiment of the present of invention, described camera lens module also comprises motion and carries seat, lens barrel, a friction means;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described friction means is placed between described extension and described elastomeric element.
In foundation one embodiment of the present of invention, described camera lens module also comprises motion and carries seat, a lens barrel;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described elastomeric element is connected to the outside of described extension or described coil, and described elastomeric element is moved together with described camera lens module.
In foundation one embodiment of the present of invention; described sleeve module comprises magnet yoke ring and the cartridge unit being placed in described magnet yoke ring inside; described cartridge unit stretches out outer face more than the 0.2mm of described magnet yoke ring, plays the effect into described camera lens module guiding and len module.
According in one embodiment of the present of invention, in described magnet yoke ring, be equipped with yoke block; Clearance is had between described yoke block and described magnet yoke ring internal face, at least one coil described is placed in described clearance and can moves along optical axis direction, and the optical axis direction length of described clearance accounts for more than 1/3rd of the optical axis direction gross thickness of described camera module.
In foundation one embodiment of the present of invention, the described magnet yoke ring of described sleeve module, described cartridge unit and described yoke block are formed in one or arrange separately.
According in one embodiment of the present of invention, at least one coil described by wire directly and power supply control apparatus be electrically connected.
In foundation one embodiment of the present of invention, at least one coil described comprises two kinds of fixed sturctures, and in first fixed structure, at least one coil described is directly fixedly connected with described extension; In the second fixed sturcture, have relative motion distance in the direction of the optical axis between at least one coil described and described extension, described relative motion distance is between 10 microns and 1 millimeter.
In foundation one embodiment of the present of invention, in described first fixed structure, there are two kinds of type of drive in described electric current,
First type of drive: at least one coil described passes into the electric current consistent with relative direction, directly promotes described camera lens module and moves;
Second type of drive: at least one coil described passes into the electric current consistent with relative inverse direction, make described camera lens module store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, promote described camera lens module to move, and static under described friction force effect.
In foundation one embodiment of the present of invention, in described second fixed sturcture, described current driver mode is: at least one coil described passes into the electric current consistent with relative inverse direction, at least one coil described is made to store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, electromagnetic force does positive work, at least one coil described accumulates kinetic energy and collides with described camera lens module, move to promote described camera lens module, and static under friction force effect.
In foundation one embodiment of the present of invention, described camera lens module can have two kinds of configuration states in step a,
The first state: state when described camera lens module is initial with focusing infinite distance object being carried out to direct imaging;
The second state: described camera lens module does not have the state of focusing infinite distance object being carried out to direct imaging when initial, described camera lens module need by described coil with electric current, by the telescopic process that camera lens module stretches out in sleeve module, adjustment enters the state of focusing infinite distance object being carried out to imaging.
According in one embodiment of the present of invention when described the second state time, described camera lens module completes the time of stretching out in sleeve module end face or retraction sleeve module and is less than 20s.
In foundation one embodiment of the present of invention, when described first state or the second state, described camera lens module is for move discontinuously, and the distance of each persistent movement is not more than 100 microns, realizes the function of search focusing position.
In foundation one embodiment of the present of invention, described camera lens module is when described sleeve module moves, by described image-forming module output image, detect described image definition, determine according to the change of described image definition and mate described first state or the second state, realizing the flexible of described camera lens module and/or focus function.
In addition, a second aspect of the present invention proposes a kind of camera module, described camera module comprises image-forming module, sleeve module, camera lens module, at least one coil, at least one magnetic part that can move relative to optical axis direction corresponding to sleeve module be placed in described sleeve module, it is characterized in that
Described camera lens module is pressed against sleeve module directly or indirectly; Between described camera lens module and sleeve module, there is radial pressure, between described camera lens module and described sleeve module, produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module of described camera lens module keep stationary state in the direction of the optical axis;
Described camera module also comprises power supply control apparatus, it is directly at least one coil with electric current described by wire, at least one coil described or at least one magnetic part described selectively match with described camera lens module, described camera lens module is subject to the electromagnetic force along described optical axis direction, described electromagnetic force does the driving force of rectilinear motion along described optical axis direction as described camera lens module, move to drive described camera lens module.
In foundation one embodiment of the present of invention, described camera module also comprises: be fixedly connected on the elastomeric element on described camera lens module, and described camera lens module is pressed against in described sleeve module indirectly via elastomeric element.
In foundation one embodiment of the present of invention, described power supply control apparatus is the electric current passed at least one coil described is pulsed, makes described camera lens module realize noncontinuity motion;
The ratio of the absolute value of the maxima and minima of described pulse current is at least 1.2;
The single pulsewidth of described pulse current is less than 2s.
In foundation one embodiment of the present of invention, described power supply control apparatus is that at least one coil described passes into initial current, make at least one coil described and at least one magnetic part geo-stationary described, voltage at least one coil described remains the first relation divided by the value of electric current, that is: U/I=R.
In foundation one embodiment of the present of invention, progressively strengthen the size of described initial current, make at least one coil described and at least one magnetic part generation relative motion described, the voltage at least one coil described is caused to be the second relation divided by the value of electric current, i.e. U/I > R; In at least one coil described in detecting, divided by the change of the described first relation generation of the value of electric current, voltage can judge that at least one coil described and at least one magnetic part described there occurs relative motion.
In foundation one embodiment of the present of invention, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial pressure between described camera lens module and sleeve module, at least one coil described, climbing speed, waveform widths, friction factor between described camera lens module and sleeve module; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module.
In foundation one embodiment of the present of invention, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is pressed against pulse current size in the radial pressure of sleeve module, at least one coil described by described elastomeric element, climbing speed, waveform widths, friction factor between described sleeve module and described elastomeric element determine; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module and elastomeric element.
In foundation one embodiment of the present of invention, described camera lens module also comprises motion and carries seat, lens barrel, a friction means;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel can merge into a single whole; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described friction means is placed between described extension and described elastomeric element.
In foundation one embodiment of the present of invention, described camera lens module also comprises motion and carries seat, a lens barrel;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Prolong the outside of raw portion or described coil described in described elastomeric element is connected to, described elastomeric element is moved together with described camera lens module.
In foundation one embodiment of the present of invention; described sleeve module comprises magnet yoke ring and the cartridge unit being placed in described magnet yoke ring inside; described cartridge unit stretches out outer face more than the 0.2mm of described magnet yoke ring, plays the effect into described camera lens module guiding and len module.
According in one embodiment of the present of invention, in described magnet yoke ring, be equipped with yoke block; Clearance is had between described yoke block and described magnet yoke ring internal face, at least one coil described is placed in described clearance and can moves along optical axis direction, and the optical axis direction length of described clearance accounts for more than 1/3rd of the optical axis direction gross thickness of described camera module.
In foundation one embodiment of the present of invention, at least one coil described comprises two kinds of fixed sturctures, and in first fixed structure, at least one coil described is directly fixedly connected with described extension; In the second fixed sturcture, have relative motion distance in the direction of the optical axis between at least one coil described and described extension, described relative motion distance is between 10 microns and 1 millimeter.
By means of the optimal control that can realize camera according to control method of the present invention and camera module, thus make this new camera module that lens barrel can be made to stretch out outside module, ensure under the condition that field angle is constant, strengthen the size of sensitive chip, improve picture quality, its structure is simple simultaneously, can be applied in the light and thin type such as mobile phone, pad electronic equipment.Moreover do not need extra electric current when lens barrel is static, thus save the power consumption of camera module, this point is even more important for portable set.
Accompanying drawing explanation
Fig. 1 is the stereoscopic structural representation according to camera module of the present invention;
Fig. 2 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the first embodiment of the present invention;
Fig. 3 is according to the camera module of the first embodiment of the present invention side sectional view along optical axis direction;
Fig. 4 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the second embodiment of the present invention;
Fig. 5 is according to the camera module of the second embodiment of the present invention side sectional view along optical axis direction;
Fig. 6 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the third embodiment of the present invention;
Fig. 7 is according to the camera module of the third embodiment of the present invention vertical view along optical axis direction;
Fig. 8 is the voltage and current signal schematic representation under driving according to voltage source of the present invention;
Fig. 9 is according to the electric current under driven with current sources of the present invention and voltage signal schematic diagram;
Figure 10 is the process flow diagram that control camera module lens barrel according to the present invention makes the method for single step campaign.
Embodiment
Below in conjunction with accompanying drawing 1-10, describe specific embodiments of the invention in detail.
Fig. 1 is the stereoscopic structural representation according to camera module of the present invention.As can be seen from the figure, can stretch out outside whole module at the camera lens module of central authorities, and can be in and do not stretch out, stretch out a part and extend out to three kinds of states such as distalmost end.
First embodiment:
Fig. 2 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the first embodiment of the present invention, and Fig. 3 is according to the camera module of the first embodiment of the present invention side sectional view along optical axis direction;
As can be seen from the figure, comprise according to camera module of the present invention: image-forming module 12, sleeve module 20, camera lens module 30, at least one coil 7 (being a coil in the present embodiment), at least one magnetic part 4 (in the present embodiment for caning be combined to eight magnetic parts of a circle) that can move relative to optical axis direction corresponding to sleeve module 20 be placed in described sleeve module 20, camera lens module 30 is pressed against sleeve module 20 directly or indirectly; Between camera lens module 30 and sleeve module 20, there is radial pressure, between camera lens module 30 and sleeve module 20, produce the friction force along optical axis direction by pressure, friction force can make camera lens module 30 relative sleeve module 20 keep stationary state in the direction of the optical axis;
Camera module also comprises power supply control apparatus, it is directly at least one coil with electric current by wire, at least one coil or at least one magnetic part selectively match with camera lens module, camera lens module is subject to the electromagnetic force along optical axis direction, electromagnetic force does the driving force of rectilinear motion along optical axis direction as camera lens module, move to drive camera lens module.
It can also be seen that from this figure: this camera module also comprises the elastomeric element 9 be arranged between camera lens module 30 and sleeve module 20, those skilled in the art should understand, this elastomeric element 9 not necessarily, also camera lens module 30 directly can be pressed against sleeve module 20.Alternatively, camera lens module 30 also can be pressed against sleeve module 20 indirectly, wherein, in order under static state not need electric current to maintain this stationary state thus to reduce the power consumption of whole camera module, according in camera module of the present invention, elastomeric element 9 is pressed against on camera lens module 30, elastomeric element 9 becomes camera lens module 30 perpendicular to the shape of optical axis direction and applies radial normal pressure, elastomeric element 9 produces the friction force along optical axis direction by this normal pressure on elastomeric element 9 with the surface of contact of camera lens module 30, this friction force can make camera lens module 30 relative resilient parts 9 keep stationary state in the direction of the optical axis, coil 7, for being fixedly arranged on camera lens module 30, namely keeps geo-stationary with camera lens module 30, selectable, and what described camera lens module 30 was direct or indirect is pressed against sleeve module 20, between described camera lens module 30 and sleeve module 20, there is radial pressure, between described camera lens module 30 and described sleeve module 20, produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module 20 of described camera lens module 30 keep stationary state in the direction of the optical axis.And
In the present embodiment, supply unit provides electric current for this camera module, power supply control apparatus (as shown in Figure 8) via image-forming module carries out controlling as coil 7 provides electric current, coil 7 and camera lens module 30 match, camera lens module 30 is subject to the electromagnetic force along optical axis direction, electromagnetic force does the driving force of rectilinear motion along optical axis direction as camera lens module 30, move to drive described camera lens module 30.
Simultaneously see Fig. 2, Fig. 3, Fig. 8, Fig. 9, Figure 10, Fig. 8 is the voltage and current signal schematic representation under driving according to voltage source of the present invention; Fig. 9 is according to the electric current under driven with current sources of the present invention and voltage signal schematic diagram; Figure 10 is the process flow diagram that control camera module lens barrel according to the present invention makes the method for single step campaign.Particularly, driver element (mark) is the electric current passed in coil 7 by the control of power supply control apparatus (mark) is pulsed, described camera lens module 30 is made to realize noncontinuity motion, the ratio of the absolute value of the maxima and minima of pulse current is at least 1.2, adopt 2 times in the present embodiment, and the single pulsewidth of pulse current is less than 2s, be 1s in the present embodiment.When the first moment, driver element passes into initial current by the control of power supply control apparatus to coil 7, make coil 7 and magnetic part 4 geo-stationary, the first relation is remained, that is: U/I=R divided by the value of electric current by the voltage detected in the magnetic test coil 7 of feedback unit (mark).Then, will progressively strengthen the size of initial current, make coil 7 and magnetic part 4 that relative motion occur, cause the voltage in coil 7 to be the second relation divided by the value of electric current, i.e. U/I > R; In detection feedback unit magnetic test coil 7, divided by the change of the first relation generation of the value of electric current, voltage can judge that coil 7 and magnetic part 4 there occurs relative motion, and obtains making coil 7 and magnetic part 4 that the critical electric current value of relative motion occur.Wherein, the motion of camera lens module 30 is relative to elastomeric element relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial normal pressure of described elastomeric element 9, described coil 7, climbing speed, waveform widths, friction factor between camera lens module 30 and elastomeric element 9; Be specially:
The range formula of single step campaign
S = nBL I w ( nBL I w - f + mg cos θ ) 2 m ( f - mg cos θ ) Δ t 2
Wherein, n is coil turn, and B is magnetic induction density, and L is the effective length of a circle coil, and m is the quality of moving component, and f is friction force size, I wbe drive current, θ is the angle of lens barrel direction of motion and gravity, and Δ t is square wave pulse width.
Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module 30.
As shown in Figure 2 and Figure 3, described camera lens module 30 also comprises motion year seat 6, lens barrel (being positioned at a motion year seat not indicate), friction means 8;
Lens barrel is placed in motion and carries in seat 6, motion carry seat and lens barrel can merge into a single whole shaping also can be shaping respectively separately; Motion is carried seat 6 and is had in some extensions 61 radially; Coil 7 is placed in described extension 61, and is suitable for moving together with camera lens module 30; Friction means 8 is placed between extension 61 and described elastomeric element 9.In addition, sleeve module 20 also comprises magnet yoke ring 2 and the cartridge unit 1 being placed in described magnet yoke ring 2 inside, and cartridge unit 20 stretches out outer face more than the 0.2mm of described magnet yoke ring 2, plays the effect into camera lens module 30 guiding and protective glass head mould 30 pieces.Moreover can be equipped with yoke block 3 in magnet yoke ring 2, yoke block 3 is magnetic conductive material, serves the effect into magnetic part 4 magnetic conduction; Have clearance between yoke block 3 and magnet yoke ring 2 internal face, coil 7 is placed in clearance and can moves along optical axis direction, and the optical axis direction length of clearance accounts for more than 1/3rd of the optical axis direction gross thickness of camera module.Wherein, the magnet yoke ring 2 of sleeve module 20, cartridge unit 1 to be formed in one with yoke block 3 or to arrange separately.
Coil 7 is connected with the first conducting position (mark) on camera lens module 30, conducting position contacts with elastomeric element 9, elastomeric element 9 is contacted with on feeder ear and is suitable for passing through means of power, and elastomeric element 9 can conduct electricity or have the second conducting position, thus make feeder ear can by the second conducting position of elastomeric element 9 or elastomeric element 9 for coil 7 provides electric current.Coil 7 comprises two kinds of fixed sturctures, in first fixed structure, coil 7 directly and extension 61 be fixedly connected; In the second fixed sturcture, have relative motion distance in the direction of the optical axis between coil 7 and extension 61, relative motion distance is between 10 microns and 1 millimeter.The control of power supply control apparatus sends a control signal to driver element and then is provided in the corresponding drive singal of coil 7 of camera module, it is coil power supply that the effect of the first conducting position, the second conducting position is suitable for power supply control apparatus via those conducting positions, selectablely do not adopt the first conducting position, the second conducting position, power supply control apparatus by wire directly (connection) in electrical contact in coil be coil power supply.
In first fixed structure, there are two kinds of type of drive in described electric current, the first type of drive: coil 7 passes into the electric current consistent with relative direction, directly promotes described camera lens module 30 and move; Second type of drive: coil 7 passes into the electric current consistent with relative inverse direction, make camera lens module 30 store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, promote camera lens module 30 to move, and static under friction force effect.
In the second fixed sturcture, current driver mode is: for coil 7 passes into the electric current consistent with relative inverse direction, make coil 7 store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, electromagnetic force does positive work, coil 7 accumulates kinetic energy and collides with described camera lens module 30, move to promote described camera lens module 30, and static under friction force effect.In addition, camera module is also provided with pedestal 10, pedestal 10 is arranged at effect image-forming module 12 played and limits camera lens module 30 optical axis direction movement position, and camera module also can comprise infrared fileter, is layed on the light-sensitive surface of the imageing sensor of image-forming module 12.
Second embodiment:
Referring to Fig. 4, Fig. 5, Fig. 8, Fig. 9, Figure 10, Fig. 4 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the second embodiment of the present invention; Fig. 5 is according to the camera module of the second embodiment of the present invention side sectional view along optical axis direction;
Driver element is the electric current passed in coil 7 ' by the control of power supply control apparatus is pulsed, described camera lens module 30 ' is made to realize noncontinuity motion, described camera lens module 30 ' mainly comprises motion and carries a seat 6 ', is placed in the ratio that motion carries the absolute value of the maxima and minima of inner camera lens (mark) pulse current of seat 6 ' and is at least 1.2, adopt 2 times in the present embodiment, and the single pulsewidth of pulse current is less than 2s, be 1s in the present embodiment.When the first moment, driver element passes into initial current by the control of power supply control apparatus to coil 7 ', making coil 7 ' and magnetic part 4 ' geo-stationary, remaining the first relation, that is: U/I=R by detecting the voltage in the magnetic test coil 7 ' of feedback unit divided by the value of electric current.Then, will progressively strengthen the size of initial current, make coil 7 ' and magnetic part 4 ' that relative motion occur, cause the voltage in coil 7 ' to be the second relation divided by the value of electric current, i.e. U/I > R; In detection feedback unit magnetic test coil 7 ', divided by the change of the first relation generation of the value of electric current, voltage can judge that coil 7 ' and magnetic part 4 ' there occurs relative motion, and obtains the critical electric current value making coil 7 ' and magnetic part 4 ' generation relative motion.Wherein, the motion of camera lens module 30 ' is for moving forward or backwards along the relative of optical axis direction relative to elastomeric element 9 ', described motion relatively forward or backwards each time has the first move distance, and described first move distance is by the pulse current size in the radial normal pressure of described elastomeric element 9 ', described coil 7 ', climbing speed, waveform widths, friction factor decision between camera lens module 30 ' and elastomeric element 9 '; Be specially:
The range formula of single step campaign
S = nBL I w ( nBL I w - f + mg cos θ ) 2 m ( f - mg cos θ ) Δ t 2
Wherein, n is the active coil number of turn of cutting magnetic line, and B is magnetic induction density, and L is the effective length of a circle coil, and m is the quality of moving component, and f is friction force size, I wbe drive current, θ is the angle of lens barrel direction of motion and gravity, and Δ t is square wave pulse width.
Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module 30 '.
In another embodiment, coil 7 ', for being fixedly arranged on camera lens module 30 ', namely keeps geo-stationary with camera lens module 30 ', and what described camera lens module 30 ' was direct or indirect is pressed against sleeve module 20 '; Between described camera lens module 30 ' and sleeve module 20 ', there is radial pressure, between described camera lens module 30 ' and described sleeve module 20 ', produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module 20 ' of described camera lens module 30 ' keep stationary state in the direction of the optical axis; Driver element is the electric current passed in coil 7 ' by the control of power supply control apparatus (such as: power supply) is pulsed, described camera lens module 30 ' is made to realize noncontinuity motion, described camera lens module 30 ' mainly comprises motion and carries a seat 6 ', is placed in the ratio that motion carries the absolute value of the maxima and minima of inner camera lens (mark) pulse current of seat 6 ' and is at least 1.2, adopt 2 times in the present embodiment, and the single pulsewidth of pulse current is less than 2s, be 1s in the present embodiment.When the first moment, driver element passes into initial current by the control of power supply control apparatus to coil 7 ', end 14 ' in electrical contact is adopted to be fixed on image-forming module 12 ' in the present embodiment, power supply control apparatus is electrically connected at coil 7 ' or coil block 7 ' (this coil block 7 ' also comprises clamping coil and the contact component 9 ' contacted with camera lens module 30 ') through wire (for mark) again by end 14 ' in electrical contact, coil 7 ' or coil block 7 ' is directly electrically connected with power supply control apparatus by wire the power supply of coil 7 '; In another embodiment, coil 7 ' makes coil 7 ' and magnetic part 4 ' geo-stationary, remains the first relation, that is: U/I=R by detecting the voltage in the magnetic test coil 7 ' of feedback unit divided by the value of electric current.Then, will progressively strengthen the size of initial current, make coil 7 ' and magnetic part 4 ' that relative motion occur, cause the voltage in coil 7 ' to be the second relation divided by the value of electric current, i.e. U/I > R; In detection feedback unit magnetic test coil 7 ', divided by the change of the first relation generation of the value of electric current, voltage can judge that coil 7 ' and magnetic part 4 ' there occurs relative motion, and obtains the critical electric current value making coil 7 ' and magnetic part 4 ' generation relative motion.Due in another embodiment for being provided with elastomeric element 9 ', the motion of camera lens module 30 ' is for moving forward or backwards along the relative of optical axis direction relative to sleeve module 20 ', described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial pressure between described camera lens module 30 ' and sleeve module 20 ', described coil 7 ', climbing speed, waveform widths, friction factor between camera lens module 30 ' and sleeve module 20 '; Be specially:
The range formula of single step campaign
S = nBL I w ( nBL I w - f + mg cos θ ) 2 m ( f - mg cos θ ) Δ t 2
Wherein, n is the active coil number of turn of cutting magnetic line, and B is magnetic induction density, and L is the effective length of a circle coil, and m is the quality of moving component, and f is friction force size, I wbe drive current, θ is the angle of lens barrel direction of motion and gravity, and Δ t is square wave pulse width.
Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module 30 '.
Please refer to shown in Fig. 4, Fig. 5, in another embodiment of the invention, camera lens module 30 ' also comprises motion and carries a seat 6 ', lens barrel (mark), selectablely provides friction means (mark);
Lens barrel is placed in motion and carries in seat 6 ', motion is carried the motion that can merge into a single whole of seat 6 ' and lens barrel and is carried a seat 6 ' and be provided with outward extending spaced some extensions 61 ', motion is carried the outside surface of seat 6 ' and is provided with coil 7 ', and coil 7 ' to be arranged between described extension 61 ' and can be suitable for moving together with camera lens module 30 '; Sleeve module 20 ', corresponding to the position of coil 7 ', arranges magnetic part 4 '; Between sleeve module 20 ' and camera lens module 30 ', be provided with elastomeric element 9 ', interchangeablely also can be provided with stiff contact component 9 ', friction means is placed between extension 61 ' and described parts 9 ', described extension 61 ' also can directly contact in described parts 9 ', should be understood that, described parts 9 ' also can be contained in corresponding coil block 7 ', and its major function is suitable for clamp standoff coil 7 ' and is contacted with motion carrying seat 6 '; Do not adopt friction means in another embodiment, the extension 61 ' of camera lens module 30 ' (or seat 6 ' is carried in the motion that comprises of camera lens module 30 ') directly contacts with coil block 7 '.Camera module also comprises: pedestal 10 ', pedestal 10 ' is arranged at the working coil 7 ' image-forming module 12 ' playing restriction camera lens module 30 ' optical axis direction movement position and is directly contacted with on power supply control apparatus, power supply control apparatus is that coil 7 ' provides electric current, selectablely provide end 14 ' in electrical contact, end 14 ' in electrical contact sets firmly, is welded on the printed circuit board (PCB) of image-forming module 12 ', power supply control apparatus is electrically connected at end 14 ' in electrical contact, then is connected directly to coil 7 ' via wire.Coil 7 ' comprises two kinds of fixed sturctures, and in first fixed structure, the extension 61 ' that coil 7 ' directly carries on seat 6 ' with motion is fixedly connected; Coil 7 ' described in second fixed sturcture and motion are carried along optical axis direction having relative motion distance between seat 6 ', and relative motion distance is between 10 microns and 1 millimeter.The control of power supply control apparatus sends a control signal to driver element and then is provided in the corresponding drive singal of coil 7 ' of camera module.In the first fixed structure of the second embodiment, there are two kinds of type of drive in electric current,
First type of drive: coil 7 ' passes into the electric current consistent with relative direction, causes directly promoting described camera lens module 30 ' mobile;
Second type of drive: coil 7 ' passes into the electric current consistent with relative inverse direction, described camera lens module 30 ' is made to store certain elastic potential energy, and pass into the electric current consistent with relative direction subsequently again, cause promoting described camera lens module 30 ' mobile, and static under friction force effect.In described second fixed sturcture, current driver mode is: pass into the electric current consistent with relative inverse direction first to coil 7 ', coil 7 ' is made to store certain elastic potential energy, and pass into the electric current consistent with relative direction subsequently again, electromagnetic force does positive work, coil 7 ' accumulates kinetic energy and collides with described camera lens module 30 ', mobile to promote described camera lens module 30 ', and static under friction force effect.
3rd embodiment
Please refer to Fig. 6, Fig. 7.Fig. 6 is the STRUCTURE DECOMPOSITION schematic diagram of the camera module according to the third embodiment of the present invention;
Fig. 7 is according to the camera module of the third embodiment of the present invention vertical view along optical axis direction, as can be seen from the figure, comprise according to camera module of the present invention: image-forming module 12 ", sleeve module 20 ", be placed in sleeve module 20 " in may correspond to the camera lens module 30 moved relative to optical axis direction in sleeve module 20 " (this part can refer to the first embodiment, but the camera lens module 30 in the present embodiment " be not provided with friction means), at least one coil 7 " (being a coil in the present embodiment), at least one magnetic part 4 " (2 magnetic parts of vertical setting in the present embodiment for caning be combined to, but not as limit), be arranged at camera lens module 30 " and sleeve module 20 " between elastomeric element 9 ", wherein, in order under static state not need electric current to maintain this stationary state thus to reduce the power consumption of whole camera module, according in camera module of the present invention, elastomeric element 9 " buckle is connected to camera lens module 30 " on, elastomeric element 9 " be pressed against be arranged at camera lens module 30 " and sleeve module 20 " between an electric conductor 13 ", electric conductor 13 " with sleeve module 20 " geo-stationary directly or indirectly fixing, elastomeric element 9 " become camera lens module 30 perpendicular to the shape of optical axis direction " with elastomeric element 9 " one electrical conductor 13 " apply radial normal pressure, elastomeric element 9 " by normal pressure at electric conductor 13 " with elastomeric element 9 " surface of contact on produce friction force along optical axis direction, friction force can make camera lens module 30 " with elastomeric element 9 " one relative sleeve module 20 " keep stationary state in the direction of the optical axis, coil 7 " for being fixedly arranged on camera lens module 30 ", namely with camera lens module 30 " keep geo-stationary, selectable, described camera lens module 30 " direct or indirect be pressed against sleeve module 20 ", in lens barrel module 30 " be directly pressed against sleeve module 20 " upper time, electric conductor 13 can not be adopted ", elastomeric element 9 ", electric conductor 13 " effect is that power supply control apparatus is by this electric conductor 13 " be coil 7 " power supply, elastomeric element 9 " one end be suitable for buckle, connect, be fixedly arranged on coil 7 ", coil 7 " further with camera lens module 30 " be connected, be suitable for and camera lens module 30 " together move along optical axis direction, elastomeric element 9 " selectable employing rigid contact parts, be not limited only to elastic construction.; Described camera lens module 30 " and sleeve module 20 " between there is radial pressure, by described pressure at described camera lens module 30 " and described sleeve module 20 " between produce friction force along optical axis direction, described friction force can make the relatively described sleeve module of described camera lens module keep stationary state in the direction of the optical axis.And
In the present embodiment, supply unit provides electric current for this camera module, it is coil 7 that power supply control apparatus (as shown in Figure 8) via image-forming module carries out control " electric current is provided; coil 7 " with camera lens module 30 " match; camera lens module 30 " be subject to along optical axis direction electromagnetic force, electromagnetic force is as camera lens module 30 " do the driving force of rectilinear motion along optical axis direction, to drive described camera lens module 30 " motion.
Simultaneously see Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Fig. 8 is the voltage and current signal schematic representation under driving according to voltage source of the present invention; Fig. 9 is according to the electric current under driven with current sources of the present invention and voltage signal schematic diagram; Figure 10 is the process flow diagram that control camera module lens barrel according to the present invention makes the method for single step campaign.Particularly, driver element (mark) is coil 7 by the control of power supply control apparatus (mark) " in the electric current that passes into be pulsed; make described camera lens module 30 " realize noncontinuity motion, the ratio of the absolute value of the maxima and minima of pulse current is at least 1.2, adopt 2 times in the present embodiment, and the single pulsewidth of pulse current is less than 2s, be 1s in the present embodiment.When the first moment, driver element by the control of power supply control apparatus to coil 7 " pass into initial current; make coil 7 " with magnetic part 4 " geo-stationary; by detecting the magnetic test coil 7 of feedback unit (mark) " in voltage remain the first relation, that is: U/I=R divided by the value of electric current.Then, will progressively strengthen the size of initial current, make coil 7 " and magnetic part 4 " there is relative motion, cause coil 7 " in voltage be the second relation divided by the value of electric current, i.e. U/I > R; Detect feedback unit magnetic test coil 7 " in the change that occurs divided by the first relation of the value of electric current of voltage can judge coil 7 " and magnetic part 4 " there occurs relative motion, and obtain making coil 7 " and magnetic part " critical electric current value of 4 generation relative motions.Wherein, camera lens module 30 " motion for and elastomeric element 9 " one relative to sleeve module 20 " move forward or backwards along the relative of optical axis direction; Described motion relatively forward or backwards each time has the first move distance, and described first move distance is by described elastomeric element 9 " radial normal pressure, described coil 7 " in pulse current size, climbing speed, waveform widths, elastomeric element 9 " and electric conductor 13 " between friction factor determine; Be specially:
The range formula of single step campaign
S = nBL I w ( nBL I w - f + mg cos θ ) 2 m ( f - mg cos θ ) Δ t 2
Wherein, n is coil turn, and B is magnetic induction density, and L is the effective length of a circle coil, and m is the quality of moving component, and f is friction force size, I wbe drive current, θ is the angle of lens barrel direction of motion and gravity, and Δ t is square wave pulse width.
Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module 30.
As shown in Figure 6, Figure 7, described camera lens module 30 " also can comprise motion and carry a seat 6 ", lens barrel (being positioned at motion carry a seat do not indicate);
Lens barrel be placed in motion carry a seat 6 " in, motion carry a seat 6 " and lens barrel can merge into a single whole shaping also can be shaping respectively separately; Seat 6 is carried in motion " have in some extensions 61 radially "; Coil 7 " be placed in described extension 61 ", and be suitable for and camera lens module 30 " together with move; .In addition; the present embodiment also can be identical with the first embodiment; corresponding to sleeve module 20 " also comprise magnet yoke ring 2 " be placed in described magnet yoke ring 2 " inner cartridge unit 1 "; cartridge unit 20 " stretch out described magnet yoke ring 2 " outer face more than 0.2mm, play as camera lens module 30 " guiding and len module 30 " effect.Moreover, magnet yoke ring 2 " in can be equipped with yoke block 3 ", yoke block 3 " be magnetic conductive material, serve as magnetic part 4 " effect of magnetic conduction; Yoke block 3 " and magnet yoke ring 2 " have clearance, coil 7 between internal face " be placed in clearance and can move along optical axis direction, the optical axis direction length of clearance accounts for more than 1/3rd of the optical axis direction gross thickness of camera module.Wherein, sleeve module 20 " magnet yoke ring 2 ", cartridge unit 1 " with yoke block 3 " be formed in one or arrange separately.
Coil 7 " with camera lens module 30 " on the first conducting position (mark) be connected, first conducting position and elastomeric element 9 " contact; elastomeric element 9 " be contacted with on feeder ear and be suitable for passing through means of power, and elastomeric element 9 " can conduct electricity or have the second conducting position, thus make feeder ear can by elastomeric element 9 " or elastomeric element 9 " conducting position be coil 7 " electric current is provided.Coil 7 " comprise two kinds of fixed sturctures, in first fixed structure, coil 7 " direct and extension 61 " be fixedly connected; In the second fixed sturcture, coil 7 " and extension 61 " between there is relative motion distance in the direction of the optical axis, relative motion distance is between 10 microns and 1 millimeter.The control of power supply control apparatus sends a control signal to driver element and then is provided in the coil 7 of camera module " corresponding drive singal is in first fixed structure; there are two kinds of type of drive in described electric current; the first type of drive: coil 7 " pass into the electric current consistent with relative direction, directly promote described camera lens module 30 " movement; Second type of drive: coil 7 " pass into the electric current consistent with relative inverse direction; make camera lens module 30 " store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, promote camera lens module 30 " mobile, and static under friction force effect.
In the second fixed sturcture, current driver mode is: be coil 7 " pass into the electric current consistent with relative inverse direction; make coil 7 " store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, electromagnetic force does positive work, coil 7 " accumulation kinetic energy and with described camera lens module 30 " collide, to promote described camera lens module 30 " mobile, and static under friction force effect.In addition, camera module is also provided with pedestal 10 "; pedestal 10 " be arranged at image-forming module 12 " and on play limit camera lens module 30 " effect of optical axis direction movement position, camera module also can comprise infrared fileter, is layed in image-forming module 12 " imageing sensor light-sensitive surface on.
Please refer in the structure of the first embodiment, the second embodiment and the 3rd embodiment, camera lens module 30,30,30 " there are two kinds of optical focusing states when initial optical states, be respectively:
The first state: camera lens module 30,30 ', 30 " initial time there is the state of focusing infinite distance object being carried out to direct imaging;
The second state: camera lens module 30,30 ', 30 " not there is the state of focusing infinite distance object being carried out to direct imaging when initial; camera lens module 30,30 ', 30 " need by coil 7,7 ', 7 " electric current is provided; by camera lens module 30,30 ', 30 " telescopic process that stretches out in sleeve module 20 ', adjustment enters the state of focusing infinite distance object being carried out to imaging.When described the second state, camera lens module 30,30 ', 30 " complete and stretch out sleeve module 20,20 ', 20 " end face or retraction sleeve module 20,20 ', 20 " and in time be less than 20s.When the first state or the second state, camera lens module 30,30 ', 30 " for move discontinuously, the distance of each persistent movement is not more than 100 microns, realizes the function of search focusing position.Camera lens module 30,30 ', 30 " relative to described sleeve module 20,20 ', 20 " when moving, by described image-forming module 12,12 ', 12 " output image; detect described image definition; determine according to the change of image definition and mate described first state or the second state, realize described camera lens module 30,30 ', 30 " flexible and/or focus function.
In the first embodiment, the second embodiment and the 3rd embodiment, as Fig. 8 and Fig. 9 respectively illustrates two kinds of different schematic diagram adopting voltage source and current source respectively.Ignore coil 7,7 ', 7 " inductance; coil 7,7 ', 7 " both end voltage and current relationship be U=RI+nBLv, wherein, U is coil 7,7 ', 7 " both end voltage, R is coil 7,7 ', 7 " resistance value, I is coil 7,7 ', 7 " in current value; n is coil turn; B is magnetic induction density, and L is a circle coil 7,7 ', 7 " effective length, v is coil 7,7 ', 7 " movement velocity.
According to this formula, as shown in Figure 8, adopt voltage source time, magnitude of voltage U is constant, and a. is when coil 7,7 ', 7 " move time, according to mechanics principle, movement velocity can first increase constant again, so coil 7,7 ', 7 " in electric current I can first reduce again constant; B. when coil 7,7 ', 7 " when not moving, coil 7,7 ', 7 " in current Iconst.
And as shown in Figure 9, when adopting current source, current value I is constant, and a. is when coil 7,7 ', 7 " when moving, along with the increase of movement velocity, coil 7,7 ', 7 " both end voltage U also increases gradually; B. when coil does not move, coil 7,7 ', 7 " both end voltage U is constant.Just can control camera lens module 30 or 30 thus ' motion.
Figure 10 shows the process flow diagram that control camera module lens barrel according to the present invention makes the method for single step campaign.Referring to Fig. 8, Fig. 9 is in lens barrel motion process, detect feedback unit magnetic test coil 7, 7 ', 7 " because of camera lens module 30 in, 30 ', 30 " to move the change divided by the value of electric current of the voltage that produces, coherent detection information is sent to power supply control apparatus, power supply control apparatus is according to the change of this ratio, must to send as an envoy to camera lens module 30, 30 ', 30 " there is the critical electric current value of relative motion, and provide corresponding control signal to driver element, driver element provides drive singal to camera module, control the camera lens module 30 in camera module, 30 ', 30 " respectively in the first embodiment, coil 7 in 3rd embodiment, 7 " synchronizable optical direction of principal axis moves or moves with magnetic part 4 ' synchronizable optical direction of principal axis in a second embodiment, and by constantly detecting feedback, controlling calculation, driving causes camera lens module 30, 30 ', 30 " in sleeve module 20, 20 ', 20 " forward relative in and counter motion.
Concrete, power supply control apparatus is according to the change of voltage divided by the value of electric current, at coil 7,7 ', 7 " in the pulse current of logical corresponding size; make driving camera lens module 30,30 ', 30 " the resistance such as electromagnetic force overcome friction, promote lens barrel relative resilient parts 9,9 ', 9 " surface of contact slide; then under kinetic force of friction effect, stop at a certain position, i.e. camera lens module 30 or 30 ' realize a stepping.
Preferably, camera lens module 30, 30 ', 30 " stepping, i.e. camera lens module 30, 30 ', 30 " relative resilient parts 9, 9 ', 9 " surface of contact slip certain distance, selectable camera lens module 30, 30 ', 30 " be elastomeric element 9, 9 ', 9 " integrally, now, elastomeric element 9, 9 ', 9 " with camera lens module 30, 30 ', 30 " relative to sleeve module 20, 20 ', 20 " slip certain distance, this distance is by elastomeric element 9, 9 ', 9 " radical elasticity, axial rigidity, electromagnetic force, the factors such as friction factor determine, the distance of stepping is each time not more than 100 microns, and possess repeatability, so repeat above-mentioned stepping process, just can control camera lens module 30, 30 ', 30 " position, realize the flexible of camera module and/or focus function.
At camera lens module 30,30 ', 30 " in stepping process; camera lens module 30,30 ', 30 " become with the process of module geo-stationary from motion, by the control of electromagnetic actuation force, make an each stepping, i.e. camera lens module 30,30 ', 30 " relative resilient parts 9,9 ', 9 " surface of contact slip certain distance.
By means of the optimal control that can realize camera according to control method of the present invention and camera module, thus make this new camera module can make camera lens module 30,30 ', 30 " stretch out outside module; ensure under the condition that field angle is constant; strengthen the size of sensitive chip; improve picture quality; its structure is simple simultaneously, can be applied in the light and thin type such as mobile phone, pad electronic equipment.Moreover, at camera lens module 30,30 ', 30 " static time do not need extra electric current, thus save the power consumption of camera module, this point is even more important for portable set.
Although illustrate in detail in accompanying drawing and aforesaid description and describe the present invention, it is illustrative and exemplary for should thinking that this is illustrated and describes, instead of restrictive; The invention is not restricted to above-mentioned embodiment.
The those skilled in the art of those the art can pass through research instructions, disclosed content and accompanying drawing and appending claims, understand and implement other changes to the embodiment disclosed.In practical application of the present invention, the function of the multiple technical characteristics quoted during a part possibility enforcement of rights requires.In the claims, word " comprises " element and step of not getting rid of other, and wording " one " does not get rid of plural number.Any Reference numeral in claim should not be construed as the restriction to scope.

Claims (32)

1. the control method of a camera module, wherein, described camera module comprises image-forming module, sleeve module, camera lens module, at least one coil, at least one magnetic part that can move relative to optical axis direction corresponding to sleeve module be placed in described sleeve module, and described control method comprises the following steps:
A. described camera lens module is pressed against sleeve module directly or indirectly, wherein, between described camera lens module and sleeve module, there is radial pressure, between described camera lens module and described sleeve module, produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module of described camera lens module keep stationary state in the direction of the optical axis; And
B. passing through wire is directly at least one coil with electric current described, at least one coil described or at least one magnetic part described selectively match with described camera lens module, described camera lens module is subject to the electromagnetic force along described optical axis direction, described electromagnetic force does the driving force of rectilinear motion along described optical axis direction as described camera lens module, move to drive described camera lens module.
2. method according to claim 1, is characterized in that, described camera module also comprises: be fixedly connected on the elastomeric element on described camera lens module, and described camera lens module is pressed against in described sleeve module indirectly via elastomeric element.
3. method according to claim 1, is characterized in that, in described step b, the electric current passed at least one coil described is pulsed, makes described camera lens module realize noncontinuity motion;
The ratio of the absolute value of the maxima and minima of described pulse current is at least 1.2;
The single pulsewidth of described pulse current is less than 2s.
4. method according to claim 3, it is characterized in that, in described step b, initial current is passed into at least one coil described, make at least one coil described and at least one magnetic part geo-stationary described, voltage at least one coil described remains the first relation divided by the value of electric current, that is: U/I=R.
5. method according to claim 4, it is characterized in that, progressively strengthen the size of described initial current, make at least one coil described and at least one magnetic part generation relative motion described, the voltage at least one coil described is caused to be the second relation divided by the value of electric current, i.e. U/I > R; In at least one coil described in detecting, divided by the change of the described first relation generation of the value of electric current, voltage can judge that at least one coil described and at least one magnetic part described there occurs relative motion.
6. method according to claim 1, it is characterized in that, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial pressure between described camera lens module and sleeve module, at least one coil described, climbing speed, waveform widths, friction factor between described camera lens module and sleeve module; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module.
7. method according to claim 2, it is characterized in that, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is pressed against pulse current size in the radial pressure of sleeve module, at least one coil described by described elastomeric element, climbing speed, waveform widths, friction factor between described sleeve module and described elastomeric element determine; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module and elastomeric element.
8. method according to claim 2, is characterized in that, described camera lens module also comprises motion and carries seat, lens barrel, friction means;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described friction means is placed between described extension and described elastomeric element.
9. method according to claim 2, is characterized in that, described camera lens module also comprises motion and carries seat, lens barrel;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described elastomeric element is connected to the outside of described extension or described coil, and described elastomeric element is moved together with described camera lens module.
10. method according to claim 8 or claim 9; it is characterized in that; described sleeve module comprises magnet yoke ring and the cartridge unit being placed in described magnet yoke ring inside; described cartridge unit stretches out outer face more than the 0.2mm of described magnet yoke ring, plays the effect into described camera lens module guiding and len module.
11. methods according to claim 10, is characterized in that, are equipped with yoke block in described magnet yoke ring; Clearance is had between described yoke block and described magnet yoke ring internal face, at least one coil described is placed in described clearance and can moves along optical axis direction, and the optical axis direction length of described clearance accounts for more than 1/3rd of the optical axis direction gross thickness of described camera module.
12. methods according to claim 10, is characterized in that, the described magnet yoke ring of described sleeve module, described cartridge unit and described yoke block are formed in one or arrange separately.
13. methods according to claim 1, is characterized in that, at least one coil described by wire directly and power supply control apparatus be electrically connected.
14. methods according to claim 8 or claim 9, it is characterized in that, at least one coil described comprises two kinds of fixed sturctures, and in first fixed structure, at least one coil described is directly fixedly connected with described extension; In the second fixed sturcture, have relative motion distance in the direction of the optical axis between at least one coil described and described extension, described relative motion distance is between 10 microns and 1 millimeter.
15. methods according to claim 14, is characterized in that, in described first fixed structure, described electric current exists two kinds of type of drive,
First type of drive: at least one coil described passes into the electric current consistent with relative direction, directly promotes described camera lens module and moves;
Second type of drive: at least one coil described passes into the electric current consistent with relative inverse direction, make described camera lens module store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, promote described camera lens module to move, and static under described friction force effect.
16. methods according to claim 14, it is characterized in that, in described second fixed sturcture, described current driver mode is: at least one coil described passes into the electric current consistent with relative inverse direction, at least one coil described is made to store certain elastic potential energy and pass into the electric current consistent with relative direction subsequently again, electromagnetic force does positive work, at least one coil described accumulates kinetic energy and collides with described camera lens module, move to promote described camera lens module, and static under friction force effect.
17. methods according to claim 1, is characterized in that, described camera lens module can have two kinds of configuration states in step a,
The first state: state when described camera lens module is initial with focusing infinite distance object being carried out to direct imaging;
The second state: described camera lens module does not have the state of focusing infinite distance object being carried out to direct imaging when initial, described camera lens module need by described coil with electric current, by the telescopic process that camera lens module stretches out in sleeve module, adjustment enters the state of focusing infinite distance object being carried out to imaging.
18. methods according to claim 17, is characterized in that, when described the second state, described camera lens module completes the time of stretching out in sleeve module end face or retraction sleeve module and is less than 20s.
19. methods according to claim 18, is characterized in that, when described first state or the second state, described camera lens module is for move discontinuously, and the distance of each persistent movement is not more than 100 microns, realize the function of search focusing position.
20. methods according to claim 19, it is characterized in that, described camera lens module is when described sleeve module moves, by described image-forming module output image, detect described image definition, determine according to the change of described image definition and mate described first state or the second state, realizing the flexible of described camera lens module and/or focus function.
21. 1 kinds of camera modules, described camera module comprises image-forming module, sleeve module, camera lens module, at least one coil, at least one magnetic part that can move relative to optical axis direction corresponding to sleeve module be placed in described sleeve module, it is characterized in that
Described camera lens module is pressed against sleeve module directly or indirectly; Between described camera lens module and sleeve module, there is radial pressure, between described camera lens module and described sleeve module, produce the friction force along optical axis direction by described pressure, described friction force can make the relatively described sleeve module of described camera lens module keep stationary state in the direction of the optical axis;
Described camera module also comprises power supply control apparatus, it is directly at least one coil with electric current described by wire, at least one coil described or at least one magnetic part described selectively match with described camera lens module, described camera lens module is subject to the electromagnetic force along described optical axis direction, described electromagnetic force does the driving force of rectilinear motion along described optical axis direction as described camera lens module, move to drive described camera lens module.
22. camera modules according to claim 21, it is characterized in that, described camera module also comprises: be fixedly connected on the elastomeric element on described camera lens module, described camera lens module is pressed against in described sleeve module indirectly via elastomeric element.
23. camera modules according to claim 21, is characterized in that, described power supply control apparatus is the electric current passed at least one coil described is pulsed, make described camera lens module realize noncontinuity motion;
The ratio of the absolute value of the maxima and minima of described pulse current is at least 1.2;
The single pulsewidth of described pulse current is less than 2s.
24. camera modules according to claim 23, it is characterized in that, described power supply control apparatus is that at least one coil described passes into initial current, make at least one coil described and at least one magnetic part geo-stationary described, voltage at least one coil described remains the first relation divided by the value of electric current, that is: U/I=R.
25. camera modules according to claim 24, it is characterized in that, progressively strengthen the size of described initial current, make at least one coil described and at least one magnetic part generation relative motion described, the voltage at least one coil described is caused to be the second relation divided by the value of electric current, i.e. U/I > R; In at least one coil described in detecting, divided by the change of the described first relation generation of the value of electric current, voltage can judge that at least one coil described and at least one magnetic part described there occurs relative motion.
26. camera modules according to claim 21, it is characterized in that, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is determined by the pulse current size in the radial pressure between described camera lens module and sleeve module, at least one coil described, climbing speed, waveform widths, friction factor between described camera lens module and sleeve module; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module.
27. camera modules according to claim 22, it is characterized in that, in described step b, the motion of described camera lens module is relative to sleeve module relatively moving forward or backwards along optical axis direction, described motion relatively forward or backwards each time has the first move distance, and described first move distance is pressed against pulse current size in the radial pressure of sleeve module, at least one coil described by described elastomeric element, climbing speed, waveform widths, friction factor between described sleeve module and described elastomeric element determine; Change wherein one or more parameters and can change described first move distance, to control the motion of described camera lens module and elastomeric element.
28. camera modules according to claim 22, is characterized in that, described camera lens module also comprises motion and carries seat, lens barrel, friction means;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel can merge into a single whole; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Described friction means is placed between described extension and described elastomeric element.
29. camera modules according to claim 22, is characterized in that, described camera lens module also comprises motion and carries seat, lens barrel;
Described lens barrel is placed in described motion and carries in seat, and seat is carried in described motion and described lens barrel merges into a single whole shaping or independently assembling is shaping; Described motion is carried seat and is had in some extensions radially; At least one coil described is placed in described extension, and is suitable for moving together with described camera lens module; Prolong the outside of raw portion or described coil described in described elastomeric element is connected to, described elastomeric element is moved together with described camera lens module.
30. camera modules according to claim 28 or 29; it is characterized in that; described sleeve module comprises magnet yoke ring and the cartridge unit being placed in described magnet yoke ring inside; described cartridge unit stretches out outer face more than the 0.2mm of described magnet yoke ring, plays the effect into described camera lens module guiding and len module.
31. camera modules according to claim 30, is characterized in that, be equipped with yoke block in described magnet yoke ring; Clearance is had between described yoke block and described magnet yoke ring internal face, at least one coil described is placed in described clearance and can moves along optical axis direction, and the optical axis direction length of described clearance accounts for more than 1/3rd of the optical axis direction gross thickness of described camera module.
32. camera modules according to claim 28 or 29, it is characterized in that, at least one coil described comprises two kinds of fixed sturctures, and in first fixed structure, at least one coil described is directly fixedly connected with described extension; In the second fixed sturcture, have relative motion distance in the direction of the optical axis between at least one coil described and described extension, described relative motion distance is between 10 microns and 1 millimeter.
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