CN1940698A - Voice coil motor autofocus device with position feedback and its focusing method - Google Patents
Voice coil motor autofocus device with position feedback and its focusing method Download PDFInfo
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- CN1940698A CN1940698A CN 200510105546 CN200510105546A CN1940698A CN 1940698 A CN1940698 A CN 1940698A CN 200510105546 CN200510105546 CN 200510105546 CN 200510105546 A CN200510105546 A CN 200510105546A CN 1940698 A CN1940698 A CN 1940698A
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Abstract
An automatic focusing device with position feedback for voice coil motor is composed of lens set holder, optical sensing unit holder, permanent magnet set, yoke and main body. Wherein, a lens group is fixed on the lens group bearing seat, at least two circles of driving coils are wound on the periphery of the lens group bearing seat, and the winding directions of two adjacent coils are opposite. In addition, a light sensing component is fixed on the light sensing component bearing seat. The permanent magnet group is composed of at least two permanent magnets which form an upper permanent magnet and a lower permanent magnet. The permanent magnet set is positioned outside the lens group bearing and corresponds to at least two coils arranged on the lens group bearing. The permanent magnet set is arranged on the yoke and forms a magnetic framework of a closed loop with the yoke. Therefore, the density of magnetic lines of force is increased, the magnetic actuation efficiency is improved, and the magnetic actuator has the advantages of saving power consumption and prolonging the standby and use time of products.
Description
Technical field
The present invention relates to a kind of voice coil motor automatic focusing mechanism of tool position feedback, being particularly related to a kind of being used for the voice coil motor is the autofocus lens group of power source, the voice coil motor automatic focusing mechanism of the position feedback when coming the position conduct of sensing lens group to focus automatically by a magnetic position sensor.
Background technology
See also Fig. 1, in general camera 1, mainly by comprising that a lens group 11, optical sensing subassembly 12 and Focusing mechanism (not shown) are formed.Wherein lens group 11 can be with the reflected image photoimaging of subject on optical sensing subassembly 12.Because if the distance of 12 of lens group 11 and optical sensing subassemblies is for fixing, then it only can clearly present beyond the 2-3 meter object apart from (hyperfocal distance).If desire to have the close-perspective recording function, then the distance between lens group and the optical sensing subassembly just must utilize described Focusing mechanism to adjust in good time.
In order to obtain blur-free imaging at different shooting distances, described Focusing mechanism must automatically be finely tuned the distance between lens group and the optical sensing subassembly.So, how in focus process, accurate localization to be carried out in the lens group position and promptly becomes an important topic.
For having now with step motor or servo motor is the mechanical type autofocus lens group of power source, though it has had relatively ripe placement technology, yet this mechanical type autofocus lens group generally all needs considerable precision mechanical transmission assembly.Not only mechanical framework complexity, and have the disappearance that number of assembling steps is loaded down with trivial details, volume is big and with high costs, also have power consumption to reach the big critical defect of noise greatly simultaneously.For the camera that needs miniaturization, for example use minisize photography device on mobile phone, PDA(Personal Digital Assistant) or mobile computer etc., then the mechanical type autofocus lens group of this kind large volume is obviously and inapplicable.
Relatively, be the lens group of power source owing to have that assembly is few, volume is little and power consumption and the relatively low advantage of noise with voice coil motor (VCM), so the relative field that is suitable for using at the minisize photography device.Yet as shown in Figure 2, existing voice coil motor automatic focusing mechanism is owing to having hysteresis phenomenon (Hysteresis) between its input current (Current) (or voltage) and the lens group displacement (Displacement), with the difficulty that causes on the accurate location.For the camera of low order, because of must not too high image quality, so generally be to stand in the mode of allowable error.And the high-order camera of having relatively high expectations for image quality, then prior art must use the optical position sensor to carry out the accurate location of lens group position.Yet because the optical position sensor need use assemblies such as LASER Light Source and optics chi, not only price is high relatively and to take volume also big.Run in the opposite direction for the miniaturization of high-quality camera and the designer trends of low priceization with camera manufacturer so, on the contrary.
Summary of the invention
The object of the present invention is to provide a kind of voice coil motor automatic focusing mechanism and method of tool position feedback, the position feedback of its position that can come the sensing lens group by a magnetic position sensor during as focusing automatically, and have assembly simplify, simple in structure, volume is less, cost is lower, with the location accurately and advantages such as low noise.
Another purpose of the present invention is to provide a kind of voice coil motor of tool position feedback method of focusing automatically, it can calculate the magnitude of voltage that sensed by magnetic position sensor and the functional expression between the lens group position, as the position feedback of the lens group when focusing automatically, and then reach pinpoint function.
A further object of the present invention is to provide a kind of voice coil motor automatic focusing mechanism of tool position feedback, its electro-magnetic braking device that cooperates the two poles of the earth permanent magnet up and down to be constituted by twin coil drives the lens group action of focusing automatically, can increase density of line of magnetic force, make full use of effective magnetic force district of permanent magnet, increase driving efficient, have the effect of the amount of saving energy.
In order to achieve the above object, a preferred embodiment of the voice coil motor automatic focusing mechanism of tool position feedback of the present invention is to include: a lens group, a voice coil motor, an optical sensing subassembly, an image process unit, a magnetic position sensor, a position decoding unit, an and voice coil motor driver element.Voice coil motor can electromagnetic drive mode driving lens group move.Optical sensing subassembly is accepted from one of described lens group image light and is converted into an image signal.Described image process unit can be accepted described image signal and handle and can analyze one of described image signal focusing sharpness.Magnetic position sensor is incorporated on the lens group, can respond to a magnetic field intensity and be converted into a voltage signal.The position decoding unit can accept and according to described voltage signal detect the position of lens group.The voice coil motor driver element is to be coupled in voice coil motor, image process unit, and position decoding unit, can be according to described focusing sharpness and lens group position, export corresponding controlling signal and give voice coil motor, and and then drive lens group and move, to reach the function that improves the focusing sharpness.
In a preferred embodiment, described voice coil motor is to include: a lens group bearing and a permanent magnet groups.Be fixed with described lens group on the lens group bearing, in the peripheral drive coils that twine at least two circles of lens group bearing, and the winding direction of adjacent two drive coils is on the contrary.Described magnetic position sensor is to be fixed on lens group bearing and position between two drive coils and can be with the lens group displacement.Permanent magnet groups by at least two permanent magnets with the opposite mode of magnetic pole stacked composition up and down, described permanent magnet groups is the periphery that is arranged at the lens group bearing, and the position of described at least two permanent magnets is roughly corresponding with the position of described at least two drive coils respectively.By described at least two drive coils are imposed electric current, can produce predetermined magnetic force, and impel the lens group bearing to be pushed and displacement together with the lens group on it.
In order to achieve the above object, in the voice coil motor focusing method automatically of tool position feedback of the present invention, its preferred embodiment that can calculate functional expression between the magnitude of voltage that sensed by magnetic position sensor and the lens group position is to include the following step:
Drive lens group with voice coil motor and come and go together with the magnetic position sensor on it and be displaced between the predetermined stroke, in moving process, write down lens group when most known location P by magnitude of voltage V that magnetic position sensor sensed respectively;
According to resulting most lens group position P and magnitude of voltage V data, calculate the X-axis coordinate figure x of lens group position P and the functional expression between the magnitude of voltage V;
Use described functional expression as one of described voice coil motor automatic focusing mechanism position feedback computing formula, can move to carry out in the automatic focusing process when driving lens group in the future, calculate lens group positional value P by the magnitude of voltage V that magnetic position sensor sensed is imported described functional expression, and then the function of position feedback can be provided.
In order to achieve the above object, the voice coil motor of a kind of tool position feedback of the present invention method of focusing automatically, it includes:
Drive a lens group by a voice coil motor with electromagnetic drive mode and carry out limited moving;
Accept from an image light of described lens group and be converted into an image signal by an optical sensing subassembly, and use an image process unit to analyze the focusing sharpness of described image signal;
On described lens group, respond to a magnetic field intensity and be converted into a voltage signal by a magnetic position sensor;
Try to achieve a position at described lens group place according to described voltage signal by a position decoding unit; And
, export corresponding controlling signal and give voice coil motor according to described focusing sharpness and lens group position by a voice coil motor driver element, and and then drive lens group and move, to reach the function that improves the focusing sharpness.
Description of drawings
Fig. 1 is the synoptic diagram of existing camera lens focusing principle;
Fig. 2 is the functional arrangement of existing its input current of voice coil motor automatic focusing mechanism (Current) with the relation of displacement (Displacement);
Fig. 3 is a preferred embodiment circuit block diagram of the voice coil motor automatic focusing mechanism of tool position feedback of the present invention;
Fig. 4 is the structural upright exploded view of the voice coil motor automatic focusing mechanism preferred embodiment of tool position feedback of the present invention;
Fig. 5 is that lens group bearing coil twines schematic appearance in the voice coil motor automatic focusing mechanism of tool position feedback of the present invention;
Fig. 6 is a magnetic illustrative view in the voice coil motor automatic focusing mechanism of tool position feedback of the present invention;
Fig. 7 is the schematic appearance of midplane formula shell fragment of the present invention;
Fig. 8 is explanation magnetic position sensor used in the present invention, its voltage signal of sensing (magnitude of voltage e
H) and externally-applied magnetic field (H) between the relation synoptic diagram;
Fig. 9 is explanation unipolar type magnetic position sensor used in the present invention, the signal functional arrangement between its externally-applied magnetic field of sensing size and the magnetic position sensor position;
Figure 10 is in the voice coil motor focusing method automatically of tool position feedback of the present invention, is used for calculating the magnitude of voltage that sensed by the unipolar type magnetic position sensor and a preferred embodiment process flow diagram of the functional expression method between the lens group position;
Figure 11 is that the present invention is for using the biphasic or bipolar type magnetic position sensor, the signal functional arrangement between the externally-applied magnetic field of being sensed size and the biphasic or bipolar type magnetic position sensor position.
Description of reference numerals: 1 camera; 11 lens group; 12 optical sensing subassemblies; 20 voice coil motor automatic focusing mechanisms; 22 voice coil motors; 24 image process units; 25 magnetic position sensors; 26 position decoding units; 27 voice coil motor driver elements; 3 lens group bearings; 31 lens group; 32 first drive coils; 33 second drive coils; 4 optical sensing subassembly bearings; 41 optical sensing subassemblies; 5 permanent magnet groups; 51 first permanent magnets; 52 second permanent magnets; 6 yokes; 7 main bodys; 8 dampings; 81 loam cakes; 82 first elastic partss; 83 second elastic partss; 821,831 hollow-out slot bores; 84 bases; 91～94 process steps;
Embodiment
See also a preferred embodiment circuit block diagram of the voice coil motor automatic focusing mechanism of Fig. 3 tool position feedback of the present invention.Described voice coil motor automatic focusing mechanism 20 is to include: a lens group 31, a voice coil motor 22 (VCM), an optical sensing subassembly 41, an image process unit 24, a magnetic position sensor 25, a position decoding unit 26 and a voice coil motor driver element 27.
Described lens group 31 is by the optical lens group that comprises that some lens constitute, and perhaps in another preferred embodiment, described lens group 31 also can be a zoom lens group.Because described optical lens group and zoom lens group are to belong to prior art and non-ly be feature of the present invention place, thus below will not give unnecessary details its detailed formation.
Described voice coil motor 22 (VCM) is to be incorporated into lens group 31, it includes assemblies such as inductive coil, permanent magnet, can electromagnetic drive mode drive lens group 31 and carry out limited linearity and come and go and move, the distance of adjusting between lens group 31 and the optical sensing subassembly 41 reaches focus function.In the present invention, described voice coil motor 22 can be selected known voice coil motor at present for use.Perhaps, the present invention more discloses a kind of voice coil motor 22 of original creation, can drive the lens group action of focusing automatically by the electro-magnetic braking device that twin coil cooperates the two poles of the earth permanent magnet up and down to be constituted, can increase density of line of magnetic force, make full use of effective magnetic force district of permanent magnet, increase driving efficient, have the effect of the amount of saving energy.The detailed formation of the voice coil motor 22 of this present invention original creation will describe in detail after a while.
Described optical sensing subassembly 41 is corresponding to described lens group 31, can be for accepting from one of described lens group 31 image light and being converted into an image signal.In a preferred embodiment, described optical sensing subassembly 41 (Image Sensor) can be CCD (Charged Coupled Device), CMOS or other can convert image light signal to the assembly of electrical signal.
Described image process unit 24 (Image Processing Unit) is coupled in optical sensing subassembly 41, can accept described image signal and is processed into the digital signal that can supply the form of computer interpretation.Whether in this preferred embodiment, described image process unit 24 includes an automatic focusing process unit, and it can analyze the focusing sharpness of described image signal, need moving lens group 31 to carry out focusing work with decision.
Described magnetic position sensor 25 (Magnetic Sensor) is to be combined on the lens group 31 also therewith to move, and can respond to a magnetic field intensity and be converted into a voltage signal.
Described position decoding unit 26 (Position Decoder) is to be coupled in magnetic position sensor 25, can accept and according to described voltage signal detect the position of lens group 31, with lens group 31 position feedbacks when focusing action.
Described voice coil motor driver element 27 is to be coupled in voice coil motor 22, image process unit 24, and position decoding unit 26, can be according to the data of described focusing sharpness and lens group 31 positions, export corresponding controlling signal and give voice coil motor 22, and and then drive lens group 31 and move, to reach the focus function that improves imaging definition.
Because the present invention uses position that the little and magnetic position sensor 25 that do not take up space of volume comes sensing lens group 31 with the position feedback when focusing automatically.Any extra precision optical machinery assembly or expensive optical profile type positioning component must be set hardly, thus can have assembly simplify, simple in structure, volume is less, cost is lower, with locate accurate or the like advantage.
See also Fig. 4, Fig. 5 and Fig. 6, be the voice coil motor automatic focusing mechanism of tool position feedback of the present invention, it includes a preferred embodiment structural drawing of the voice coil motor 22 of the present invention's original creation.Wherein, Figure 4 shows that the structural upright exploded view of the voice coil motor automatic focusing mechanism of tool position feedback of the present invention.Fig. 5 is that lens group bearing coil twines schematic appearance in the voice coil motor automatic focusing mechanism of tool position feedback of the present invention.Fig. 6 is a magnetic illustrative view in the voice coil motor automatic focusing mechanism of tool position feedback of the present invention.
As shown in Figure 4, the voice coil motor 22 in the voice coil motor automatic focusing mechanism of the tool position feedback of present embodiment mainly is made up of lens group bearing 3 (Lens-holder), optical sensing subassembly bearing 4 (Sensor-holder), permanent magnet groups 5 (Magnets), yoke 6 (Yoke) and main body 7.Wherein, be fixed with described lens group 31 on the lens group bearing 3 (Lens-holder), be provided with at least one first drive coil 32 (First coils) and one second drive coil 33 (Second coils) described lens group bearing 3 peripheral windings.The position of described magnetic position sensor is to be fixed on lens group bearing and position between two drive coils and can be with the lens group displacement.
See also Fig. 4 and Fig. 5, in this preferred embodiment, the winding direction of described adjacent first drive coil 32 and second drive coil 33 is opposite, just, when energising, the current opposite in direction of described first drive coil 32 and second drive coil 33.In addition, be fixed with described optical sensing subassembly 41 (CMOS/CCD Sensor) on the optical sensing subassembly bearing 4 (Sensor-holder), it can be for the image light of accepting from lens group 31.And permanent magnet groups 5 (Magnets) is made up of at least one first permanent magnet 51 (FirstMagnet) and second permanent magnet 52 (Second Magnet).Described first permanent magnet 51 is stacked up and down in the opposite mode of magnetic pole with second permanent magnet 52, has the permanent magnet groups 5 at the two poles of the earth up and down and can constitute one.That is to say that first permanent magnet 51 and second permanent magnet 52 be in opposite towards the magnetic pole of lens group 31 sides, and make described permanent magnet groups 5 have two opposite magnetic poles (as shown in Figure 6) in upper and lower half towards lens group 31 sides.Described permanent magnet groups 5 is arranged on the yoke 6 of lens group bearing 3 peripheries, and corresponding with set first drive coil 32 and second drive coil 33 on the described lens group bearing 3.That is to say that the position of first permanent magnet 51 is then to be roughly corresponding to second drive coil 33 corresponding to the position of first drive coil, 32 second permanent magnets 52 roughly.
When desiring to carry out the switching of lens group 31 positions (when for example focusing), as long as respectively first set on the described lens group bearing 3 drive coil 32 and second drive coil 33 are passed to a scheduled current, make two drive coils 32,33 produce the magnetic line of force of specific direction.By and the magneticaction of 52 of first permanent magnet 51 and second permanent magnets, provide described lens group bearing 3 one along lens group 31 axle center forward (for example top of Fig. 5) promote or promote backward the strength of (for example below of Fig. 5).So, the described lens group bearing 3 that is provided with lens group 31 just can be pushed towards predetermined direction and move, change thus lens group 31 and optical sensing subassembly 41 between the two distance and reach focusing and adjust the purpose of focal length.
See also Fig. 6, by the described structure of leading portion, first permanent magnet 51 in the described permanent magnet groups 5 that is arranged on the yoke 6 and second permanent magnet 52 can form the magnetic force framework of a closed loop with described yoke 6, increase the density of the magnetic line of force, promote the efficient of magnetic start.Therefore, the present invention only need use lower electric current just can provide enough thrust to promote lens group bearing 3 with respect to existing structure and produce displacement.So not only can significantly save its power consumption, and can under the condition of using the big baby battery of same capability, effectively prolong the standby of product or the time of manipulating, increase user's convenience.
Please continue with reference to figure 4, the present invention's part at lens group bearing 3 in aforesaid structure further is provided with a damping 8.Described damping 8 is made up of loam cake 81 (Cover), first elastic parts 82 (First spring), second elastic parts 83 (Second spring) and base 84 (Base).Wherein, loam cake 81 is to be separately positioned on the top and the below of lens group bearing 3 and to combine fixing with main body 7 with base 84.First elastic parts 82 is arranged between lens group bearing 3 and the loam cake 81, and second elastic parts 83 then is arranged between lens group bearing 3 and the base 84.Therefore first elastic parts 82 by being arranged on lens group bearing 3 front ends and rear end in the described damping 8 and second elastic parts 83 provide an enough suspention and the strength of support, 3 suspentions of lens group bearing can be supported in it.No matter be that described lens group bearing 3 is in the process of forward and backward start displacement, or lens group bearing 3 is when resting on the fixed position and but suffering the collision of external force, and employed first elastic parts 82 and second elastic parts 83 can provide the power of one damping, buffering in good time in the described damping 8.And the present invention is a kind of plane formula shell fragments in aforementioned described first elastic parts 82 and second elastic parts 83.
See also shown in Figure 7ly, it is the schematic appearance of plane formula shell fragment, and described kind of plane formula shell fragment mainly is on the lamellar body on a plane, and the microscler hollow-out slot bore 821,831 in some roads is set, and only stays the part junction.The restoring force that utilizes the material of described shell fragment own to be had provides support the required suspention holding power of lens group bearing 3.With respect to the elastic parts or even the shell fragment of other type, the present invention can significantly reduce its overall volume thus, for miniature splendid progress and contribution is arranged.Can make the voice coil motor automatic focusing mechanism of tool position feedback of the present invention, be applied on the more products (for example: in be built in digital camera of mobile computer etc.), have more complete focus function.
See also Fig. 8, its exposure has magnetic position sensor 25 used in the present invention, its voltage signal of sensing (magnitude of voltage e
H) and externally-applied magnetic field (H) between relation, e just
H=R
HIH/t.Wherein, e
HBe inductive voltage value, i is a current value, and H is the externally-applied magnetic field value, and t is the one-tenth-value thickness 1/10 of magnetic position sensor 25.Thus a relational expression as can be known, described inductive voltage value (e
H) with externally-applied magnetic field (H) be proportional relation.
See also Fig. 9, its exposure has unipolar type magnetic position sensor used in the present invention, the signal functional arrangement between its externally-applied magnetic field of sensing size and the magnetic position sensor position.See through the design of the two poles of the earth magnet 5 height dimension L up and down, the unipolar type magnetic position sensor 25 on the lens group bearing measures the flux density of actuation stroke L ' and the pass of lens group upright position is just like linear function shown in Figure 9.Utilize this linear function inductive voltage value that unipolar type magnetic sensor 25 can be measured one to one, see through suitable conversion Calculation method, calculate and learn lens group 31 upright positions, and then can provide the position feedback signal to reach the function of precision positioning to voice coil motor driver element 27.
See also Figure 10, its exposure has in the voice coil motor focusing method automatically of tool position feedback of the present invention, is used for calculating the magnitude of voltage that sensed by the unipolar type magnetic position sensor and a preferred embodiment process flow diagram of the functional expression method between the lens group position.Described method includes the following step:
Step 91: magnetic position sensor is measured its " position P " and " voltage V " value in whole actuation stroke.Wherein, " position P " if when representing with phase place (Phase), its value then is Φ.And if when representing " position P " with the X-axis coordinate figure among Fig. 9, its positional value then is x.Driving lens group with voice coil motor is displaced between the predetermined stroke L ' together with the magnetic position sensor on it is round.In moving process, write down simultaneously lens group when most known location P by most magnitude of voltage V that magnetic position sensor sensed respectively.
Step 92:, set up corresponding tables (the Look Up Table of " position P " and " voltage V " by described most position P and magnitude of voltage V data; Be called for short LUT), functional arrangement as shown in Figure 9 just.
Step 93: the LUT according to resulting most lens group position P and magnitude of voltage V data are set up, calculate the X-axis coordinate figure x of lens group position P and the functional expression V=Ax+B between the magnitude of voltage V, 0＜x＜L ' wherein, A and B are undetermined coefficient.
Step 94: use the position feedback computing formula of described functional expression as described voice coil motor automatic focusing mechanism, can move to carry out in the automatic focusing process when driving lens group in the future, calculate lens group positional value P by the magnitude of voltage V that magnetic position sensor sensed is imported described functional expression, and then the function of position feedback can be provided.That is to say, magnetic position sensor is at any position (Position, or phase place Phase) the magnitude of voltage V value that is detected all can see through mathematical expression x=(V-B)/A and calculate the absolute lens group position P (or phase place Phase) that shows with X-axis coordinate figure x.
See also Figure 11, for the present invention for using the biphasic or bipolar type magnetic position sensor, the signal functional arrangement between the big or small and biphasic or bipolar type magnetic position sensor position of the externally-applied magnetic field of being sensed.And in the preferred embodiment of the present invention of using the biphasic or bipolar type magnetic position sensor, be used for calculating the magnitude of voltage that sensed by the biphasic or bipolar type magnetic position sensor and the functional expression method between the lens group position and then can include the following step:
At first the 2 π cycles of the whole actuation stroke of biphasic or bipolar type magnetic position sensor measure one time, set up between whole stroke L corresponding tables (the Look Up Table of the corresponding inductive voltage value V of biphasic or bipolar type magnetic position sensor position P (V and two groups of signals of V ' of comprising the biphasic or bipolar type magnetic position sensor); Be called for short LUT), functional arrangement as shown in figure 11 just.Its similar two sine functions but phase differential pi/2.
Then, obtain the mathematical expression V=Asin Φ of biphasic or bipolar type magnetic position sensor output voltage values V and position P, V '=Acos Φ, wherein Φ=(2 π/L ') x by LUT.
By above-mentioned formula, magnitude of voltage V and V ' that the biphasic or bipolar type magnetic position sensor is detected in any position P (Phase), all can confirm correct Φ value by the following formula comparison, see through mathematical expression Φ=sin-1 (V/A) again and draw absolute position P (Phase), avoid the problem of sin function and the non-one-one relationship of position P.
But above-described embodiment shall not be applied to restriction range of application of the present invention, and the scope that protection scope of the present invention should be included with claim content institute's definition techniques spirit of the present invention and impartial variation thereof is main person.Promptly the equalization of being done according to the present patent application claim generally changes and modifies, and will not lose main idea of the present invention place, does not also break away from the spirit and scope of the present invention, and the former capital should be considered as further enforcement situation of the present invention.
Claims (10)
1. the voice coil motor automatic focusing mechanism of a tool position feedback is characterized in that, comprising:
One lens group;
One voice coil motor is incorporated into lens group, and it can electromagnetic drive mode driving lens group move;
One optical sensing subassembly, corresponding to described lens group, confession is accepted from an image light of described lens group and is converted into an image signal;
One image process unit is coupled in optical sensing subassembly, accepts the focusing sharpness that described image signal was handled and can be analyzed to described image signal;
One magnetic position sensor is incorporated on the lens group, responds to a magnetic field intensity and is converted into a voltage signal;
One position decoding unit is coupled in magnetic position sensor, accepts and obtain according to described voltage signal detecting the position of lens group;
One voice coil motor driver element, be coupled in voice coil motor, image process unit, reach the position decoding unit, according to described focusing sharpness and lens group position, the corresponding controlling signal of output is given voice coil motor, and and then drive lens group and move, to reach the function that improves the focusing sharpness.
2. as the voice coil motor automatic focusing mechanism of claims 1 described tool position feedback, it is characterized in that described voice coil motor includes:
One lens group bearing is fixed with described lens group on it, at the peripheral drive coil that twines at least two circles of lens group bearing, and the winding direction of adjacent two drive coils is opposite; And
One permanent magnet groups, the two poles of the earth permanent magnet groups about in the of one that it is made up of at least two permanent magnets, described permanent magnet groups is arranged on the periphery of lens group bearing, and the position of described at least two permanent magnets is roughly corresponding with the position of described at least two drive coils respectively;
Wherein,, can produce predetermined magnetic force, and impel the lens group bearing to be pushed and displacement together with the lens group on it by described at least two drive coils are imposed electric current;
Wherein, described magnetic position sensor is to be fixed on the lens group bearing and between two drive coils and with the lens group displacement.
3. as the voice coil motor automatic focusing mechanism of claims 2 described tool position feedbacks, it is characterized in that, described permanent magnet groups is to include at least one first permanent magnet and one second permanent magnet, described first permanent magnet is stacked up and down in the opposite mode of magnetic pole with second permanent magnet, make first permanent magnet and second permanent magnet opposite towards the magnetic pole of lens group side, so, described permanent magnet groups has two opposite magnetic poles in the upper and lower half towards the lens group side.
4. as the voice coil motor automatic focusing mechanism of claims 2 described tool position feedbacks, it is characterized in that described voice coil motor more includes:
One optical sensing subassembly bearing is fixed with described optical sensing subassembly on it;
One main body, which is provided with one can be for the spatial accommodation that holds the lens group bearing, and described main body is fixed thereon for permanent magnet groups and the combination of optical sensing subassembly bearing; And
One yoke is positioned on the main body and for placing described permanent magnet groups, and forms the magnetic force framework of a closed loop with described permanent magnet groups.
5. as the voice coil motor automatic focusing mechanism of claims 2 described tool position feedbacks, it is characterized in that, the lens group bearing further is arranged on one to be had in the damping of buffering effect, described damping is made up of a loam cake, one first elastic parts, one second elastic parts and a base, described loam cake is to be separately positioned on the top and the below of lens group bearing and to combine fixing with main body with base, first elastic parts then is arranged between camera lens bearing and the loam cake, and second elastic parts then is arranged between lens group bearing and the base; Wherein, described first elastic parts and second elastic parts are the plane shell fragment.
6. the voice coil motor of the tool position feedback method of focusing automatically, be used for the voice coil motor automatic focusing mechanism, described voice coil motor automatic focusing mechanism comprises a lens group, a voice coil motor, a magnetic position sensor, it is to drive lens group with electromagnetic drive mode to move for described voice coil motor, and described magnetic position sensor is combined in and is used for induced field intensity on the lens group and exports a corresponding voltage signal; It is characterized in that:
Make voice coil motor drive lens group and come and go together with the magnetic position sensor on it and be displaced between the predetermined stroke, in moving process, write down lens group when most known location P by magnitude of voltage V that magnetic position sensor sensed respectively;
According to resulting most lens group position P and magnitude of voltage V data, calculate the X-axis coordinate figure x of lens group position P and the functional expression V=Ax+B between the magnitude of voltage V;
Use the position feedback computing formula of described functional expression as described voice coil motor automatic focusing mechanism, when moving, the driving lens group carrying out in the automatic focusing process in the future, calculate lens group positional value P by the magnitude of voltage V that magnetic position sensor sensed is imported described functional expression, and then the function of position feedback can be provided.
7. as the voice coil motor of claims 6 described tool position feedbacks method of focusing automatically, it is characterized in that described voice coil motor automatic focusing mechanism more includes:
One optical sensing subassembly is corresponding to described lens group, for accepting from one of described lens group image light and being converted into an image signal;
One image process unit is coupled in optical sensing subassembly, accepts the focusing sharpness that described image signal was handled and can be analyzed to described image signal;
One position decoding unit is coupled in magnetic position sensor, accept and according to the magnitude of voltage of described voltage signal detect the position of lens group; And,
One voice coil motor driver element, be coupled in voice coil motor, image process unit, reach the position decoding unit, according to described focusing sharpness and lens group position, export corresponding controlling signal and give voice coil motor, and and then drive lens group and move, to reach the function that improves the focusing sharpness.
8. as the voice coil motor of claims 7 described tool position feedbacks method of focusing automatically, it is characterized in that described voice coil motor is to include:
One lens group bearing is fixed with described lens group on it, at the peripheral drive coil that twines at least two circles of lens group bearing, and the winding direction of adjacent two drive coils is opposite; And
One permanent magnet groups, it one of is formed the two poles of the earth permanent magnet groups up and down by at least two permanent magnets, described permanent magnet groups is the periphery that is arranged at the lens group bearing, and the position of described at least two permanent magnets is roughly corresponding with the position of described at least two drive coils respectively;
Wherein, by described at least two drive coils are imposed electric current, produce predetermined magnetic force, and impel the lens group bearing to be pushed and displacement together with the lens group on it;
Wherein, described magnetic position sensor is to be fixed on lens group bearing and position between two drive coils and with the lens group displacement.
9. the voice coil motor of the tool position feedback method of focusing automatically, it includes:
Driving a lens group by a voice coil motor with electromagnetic drive mode moves;
Accept from an image light of described lens group and be converted into an image signal by an optical sensing subassembly, and use an image process unit to analyze the focusing sharpness of described image signal;
On described lens group, respond to a magnetic field intensity and be converted into a voltage signal by a magnetic position sensor;
Try to achieve a position at described lens group place according to described voltage signal by a position decoding unit; And
, export corresponding controlling signal and give voice coil motor according to described focusing sharpness and lens group position by a voice coil motor driver element, and and then drive lens group and move, to reach the function that improves the focusing sharpness.
10. as the voice coil motor of claims 9 described tool position feedbacks method of focusing automatically, it is characterized in that described voice coil motor is to include:
One lens group bearing is fixed with described lens group on it, at the peripheral drive coil that twines at least two circles of lens group bearing, and the winding direction of adjacent two drive coils is opposite; And
One permanent magnet groups, it one of is formed the two poles of the earth permanent magnet groups up and down by at least two permanent magnets, described permanent magnet groups is arranged on the periphery of lens group bearing, and the position of described at least two permanent magnets is roughly corresponding with the position of described at least two drive coils respectively;
Wherein, by described at least two drive coils are imposed electric current, produce predetermined magnetic force, and impel the lens group bearing to be pushed and displacement together with the lens group on it;
Wherein, described magnetic position sensor is to be fixed on lens group bearing and position between two drive coils and with the lens group displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101055464A CN100451806C (en) | 2005-09-27 | 2005-09-27 | Voice coil motor automatic focusing device with position feedback and focusing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101055464A CN100451806C (en) | 2005-09-27 | 2005-09-27 | Voice coil motor automatic focusing device with position feedback and focusing method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN1940698A true CN1940698A (en) | 2007-04-04 |
| CN100451806C CN100451806C (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101055464A Expired - Fee Related CN100451806C (en) | 2005-09-27 | 2005-09-27 | Voice coil motor automatic focusing device with position feedback and focusing method thereof |
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| Country | Link |
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| CN (1) | CN100451806C (en) |
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| CN101930150A (en) * | 2009-06-18 | 2010-12-29 | 三洋电机株式会社 | focus control circuit |
| CN101546949B (en) * | 2008-03-24 | 2012-08-29 | 鸿富锦精密工业（深圳）有限公司 | Spring plate and voice coil motor actuator |
| CN101354467B (en) * | 2007-07-27 | 2013-01-16 | 华宏新技股份有限公司 | Voice coil motor positioning device |
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| CN109565540A (en) * | 2016-07-21 | 2019-04-02 | Lg伊诺特有限公司 | Lens driving apparatus, and camera module and optical apparatus including the same |
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| US5612740A (en) * | 1994-09-19 | 1997-03-18 | Industrial Technology Research Institute | Inner focus type zoom lens driving mechanism |
| JPH0894904A (en) * | 1994-09-22 | 1996-04-12 | Canon Inc | Lens drive device, optical device and camera |
| US6166655A (en) * | 1998-10-14 | 2000-12-26 | Chen; Hung-Chou | Device and method for identifying magnetic induction coordinate |
| CN1368658A (en) * | 2001-02-09 | 2002-09-11 | 力捷电脑股份有限公司 | Automatic focusing mechanism and method |
| US6954313B2 (en) * | 2002-10-22 | 2005-10-11 | Canon Kabushiki Kaisha | Optical apparatus and lens apparatus |
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