CN105099119A - Optical anti-vibration voice coil motor capable of changing tilt shift centre and assembly method thereof - Google Patents
Optical anti-vibration voice coil motor capable of changing tilt shift centre and assembly method thereof Download PDFInfo
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- CN105099119A CN105099119A CN201510622131.8A CN201510622131A CN105099119A CN 105099119 A CN105099119 A CN 105099119A CN 201510622131 A CN201510622131 A CN 201510622131A CN 105099119 A CN105099119 A CN 105099119A
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Abstract
The invention provides an optical anti-vibration voice coil motor capable of changing tilt shift centre, comprising a substrate, at least one elastic sheet, a lens carrier, at least three magnetic body groups and a shell. The pedestal, the shell and the magnetic body groups are connected together to form a fixed structure. The magnetic body groups are arranged in the shell; the lens carrier comprises a main body and coils arranged on the main body. The number of the coils is the same as that of the magnetic body groups. The coils and the magnetic body groups are arranged oppositely one by one. The elastic sheet is connected with the lens carrier and the magnetic body groups to form a multi-variant spring oscillator system with a spring centre. The elastic sheet is electrically connected with the coils. The direction of the electromagnetic resultant force of each coil is not faced to and not back to the spring centre, and is not parallel to an optical axis. By adjusting the size of each resultant force, the motor could be used for controlling the tilt shift of the lens to be tilted and be moved along the optical axis to achieve an optical anti-vibration function and an automatic focusing function. By adopting the above structure, the optical anti-vibration voice coil motor not only is simple in structure, and high in reliability, and reduces production cost, but also could maintain excellent image resolution and resist magnetic disturbance.
Description
Technical field
The invention belongs to optical anti-vibration device technique field, particularly relate to a kind of optical anti-vibration voice coil motor and the assembly method thereof that can change Yi Zhou center.
Background technology
The skill of micro-optical stabilization voice coil motor is stated and is widely used in high-end mobile phone now, takes the probability of fuzzy photo under being effectively reduced in low luminous environment, and reduces the shake making us in film perplexing.But relative to general autofocus motor, the design comparison of stabilization voice coil motor is complicated, produce yield and efficiency lower, cost is higher.Therefore, described technology does not also spread to middle-end and low-end mobile phone, and most mobile phone man still fails to enjoy the benefit that this technology brings.
Micro-optical stabilization voice coil motor can be divided three classes: camera model shift shaft type voice coil motor, camera lens parallel-moving type voice coil motor and camera lens shift shaft type voice coil motor.Wherein, in camera model shift shaft type voice coil motor, voice coil motor controls camera lens and rotates together with image sensor; In camera lens parallel-moving type voice coil motor, voice coil motor controls camera lens translation, and image sensor is motionless; In camera lens shift shaft type voice coil motor, voice coil motor controls camera lens and rotates, and image sensor is motionless.
Above-mentioned three kinds of voice coil motors respectively have advantage and shortcoming.Such as, the advantage of camera model shift shaft type voice coil motor is that optical anti-vibration effect and image quality are best, and shortcoming is that moving-member weight is the highest, power consumption is therefore maximum.The advantage of camera lens shift shaft type voice coil motor be structure relatively simple, be conducive to producing, shortcoming is that the resolution of the image edge when optical anti-vibration likely declines.The structural complexity of camera lens parallel-moving type voice coil motor and image edge resolution are situated between camera model shift shaft type voice coil motor and camera lens shift shaft type voice coil motor, and can be accepted by production dealer and user, power consumption also can reach tolerance interval.Therefore, camera lens parallel-moving type voice coil motor becomes mobile terminal as the main flow assembly in mobile phone stabilization scheme.
Camera lens shift shaft type optical anti-vibration voice coil motor structure now, comprises a shell, a base, at least one group of elastomeric material, at least three group magnetites, at least three absolute coils and a camera lens carrier.Shell and base form motionless structure; Elastomeric material connects the bascule comprising camera lens carrier, and motionless structure, form a multivariant mass-spring system, allow camera lens can do the deflection (for optical anti-vibration) of both direction, and a displacement along optical axis direction (for auto-focusing).According to the position of coil and magnetite, camera lens shift shaft type optical anti-vibration voice coil motor can be divided into two classes.Coil in first kind camera lens shift shaft type optical anti-vibration voice coil motor and magnetite, lay respectively at motionless and bascule, and do not comprise energising elastomeric material in this type of motor, only include one to two group elastomeric material, and connect the bascule comprising camera lens carrier and magnetite.Because the bascule in such motor does not need electrical connection, be therefore more conducive to producing.But because the magnetite of first kind motor is positioned at bascule, when having other external powerful magnetic fields close to them, its performance may be interfered.
Coil in Equations of The Second Kind motor and magnetite, lay respectively at movable and motionless structure.Magnetite due to Equations of The Second Kind motor is positioned at motionless structure, and the ability of their anti-extraneous magnetic field interference is higher.Therefore, Equations of The Second Kind motor becomes the shift shaft type optical anti-vibration motor of main flow.In such motor, act on each coil or often organize the electromagnetic force direction of magnetite, optical axis of making peace greatly is parallel.Therefore, their Yi Zhou center (being namely the pivot of camera lens optical axis when optical anti-vibration) and spring center (being apply moment when comprising the moving structure of camera lens, the pivot of moving structure) are roughly in same position.In order to reach good stabilization effect, Yi Zhou center needs as far as possible away from the optical centre of camera lens and near image sensor.Therefore, the spring constant (SpringConstant) of lower shell fragment is adjusted to more than upper shell fragment high, to make described spring center and described Yi Zhou center as much as possible close to the center of described lower shell fragment.But this can cause occurring two problems: the first, described Yi Zhou center still can closely described optical centre, thus causes optical anti-vibration effect still to need to improve; Second, certain distance is there is between described spring center and the center of gravity of moving structure, when camera lens is towards horizontal direction, the gravity acting on moving structure (comprising camera lens) can make described spring center move axle, causes the resolution of image edge to reduce.Therefore, what this type of voice coil motor needed the extra control mode of use to go compensation gravity to cause moves axle, thus increases complexity and the cost of control system.
Therefore, the optical anti-vibration voice coil motor designing a kind of change Yi Zhou center newly just seems particularly necessary to solve the problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of optical anti-vibration voice coil motor and the assembly method thereof that can change Yi Zhou center, be intended to it and not only there is the performance that structure is simple, reliability is high, reduce production cost, and inclined light shaft when can support optical anti-vibration, auto-focusing and compensate auto-focusing is to promote image resolution and diamagnetic interference.
The present invention is achieved in that a kind of optical anti-vibration voice coil motor that can change Yi Zhou center, and it comprises base, at least one shell fragment, camera lens carrier, at least three magnet groups and shell; Wherein, described base, described shell and described magnet group link together and form motionless structure; Described at least three magnet groups are arranged on the inwall of described shell; The coil that described camera lens carrier comprises body and arranges on the body; Described coil and described body link together, composition bascule; The number of described coil is identical with the number of described magnet group; Described coil and described magnet group are oppositely arranged one by one, and described coil is provided with the first line end and the second line end; At least one shell fragment described connects described camera lens carrier and described magnet group and forms a multivariant mass-spring system, and described multivariant mass-spring system comprises a spring center; Described shell fragment is provided with at least three conductive paths, described first line end and described second line end are electrically connected with the two ends of described conductive path respectively; At least one shell fragment described directly or indirectly connects the electric conducting material in described coil and described base on circuit; The electromagnetism of each coil direction of making a concerted effort is neither towards also not described spring center dorsad.
Further, aforesaid each magnet group comprises the first magnet and the second magnet; Described first magnet is arranged on described base; Described second magnet is folded to be located on described first magnet, and size or the shape of described first magnet and described second magnet are different, and the magnetic direction of described first magnet and described second magnet is contrary.
Further, aforesaid base is formed with location division; Described camera lens carrier also comprises formation location notch on the body; Described location division coordinates with described location notch.
Further, at least one shell fragment aforesaid comprises the first shell fragment, and a part for described first shell fragment is connected with the bottom of described base and described body; Another part of described first shell fragment is connected with the bottom of described first magnet.
Further, at least one shell fragment aforesaid comprises the first shell fragment and the second shell fragment, and a part for described first shell fragment is connected with the top of described base, and another part of described first shell fragment is connected with the bottom of described first magnet; Described second shell fragment is connected to the top of described camera lens carrier, and the top of described second shell fragment and described second magnet and described shell are connected.
Further, the aforesaid optical anti-vibration voice coil motor that can change Yi Zhou center also comprises pressure ring; Described pressure ring is arranged between described base and described first shell fragment; Described first shell fragment is pressed in the below of described camera lens carrier by described pressure ring, and is connected with described first shell fragment.
Further, aforesaid pressure ring comprises matrix and formation multiple extensions on the matrix of ring-type; Described shell fragment is pressed in the below of described camera lens carrier by described matrix, and is connected with described shell fragment; Described camera lens carrier also comprises formation multiple breach on the body; Described substrate is formed with through hole; Described base also comprises the stage portion extended internally from the inner surface of described substrate; Described multiple extension is spaced apart and arranged on the inner surface of described matrix along the circumference of described matrix; Each extension comprises the first extension and the second extension; Described first extension to extend towards described camera lens carrier from described matrix and extends in breach corresponding on described camera lens carrier; Described second extension extends from described matrix towards described base and extends to and contacts with the described stage portion on described base.
Further, aforesaid camera lens carrier also comprises formation multiple 3rd extensions on the body; Described breach and described 3rd extension are arranged alternately along the circumference of described body; Described 3rd extension to extend towards described stage portion from described body and contacts with described stage portion.
Further, aforesaid second extension and described 3rd extension to be arranged alternately and along the circumference of described body and described stage portion Continuous Contact along the circumference of described body.
The present invention also provides a kind of assembly method of above-mentioned diamagnetic interference parallel-moving type optical anti-vibration voice coil motor, comprising:
Live wire is formed described coil on the wrapping post on described camera lens carrier and boss;
Described first shell fragment is placed on below described camera lens carrier, and makes the wrapping post below described camera lens carrier through the hole on described first shell fragment;
By described first shell fragment and described camera lens carrier mechanical connection;
Described first shell fragment and described live wire are carried out circuit connection;
Described pressure ring is placed on below described first shell fragment, and is mechanically connected;
Described first shell fragment is placed on above described base, described first shell fragment and described base are mechanically connected, more described first shell fragment is electrically connected with the conductive part on described base;
Described magnet group is fixed on the inwall of described shell, described camera lens carrier is placed in described enclosure, and guarantee that each coil is all relative with a magnet group;
The bottom of described first shell fragment and described first magnet is mechanically connected;
Described second shell fragment is placed on the top of described camera lens carrier, and make the wrapping post above described camera lens carrier through the hole on described second shell fragment, by while described second shell fragment and described camera lens carrier mechanical connection, described first shell fragment and described live wire are carried out circuit connection.
The present invention compared with prior art, beneficial effect is: optical anti-vibration voice coil motor and the assembly method thereof at what embodiment of the present invention provided can change Yi Zhou center, by magnet being mounted in motionless structure, the performance that can change the optical anti-vibration voice coil motor at Yi Zhou center is not easy to affect by extraneous magnetic field, thus has certain diamagnetic jamming performance; Meanwhile, by being located on base by folded to the first contrary for magnetic direction magnet and the second magnet, the direction that the electromagnetism of each coil is made a concerted effort neither towards also not described spring center dorsad, and and optical axis not parallel; When there being a moment to be applied in described mass-spring system, described mass-spring system can rotate around described spring center; By adjusting each size of making a concerted effort, camera lens can be controlled and move axle inclination and move along optical axis, reaching to optical anti-vibration and automatic focusing function; Therefore, optical anti-vibration be opened or auto-focusing time, the optical anti-vibration voice coil motor that can change Yi Zhou center not only supports that inclined light shaft when optical anti-vibration, auto-focusing and compensation auto-focusing is to maintain good image edge resolution, structure is simple, is convenient to produce and is conducive to improving reliability and reducing costs.
Accompanying drawing explanation
Fig. 1 is the structural representation that can change the optical anti-vibration voice coil motor at Yi Zhou center that first embodiment of the invention provides.
Fig. 2 is the decomposing schematic representation that can change the optical anti-vibration voice coil motor at Yi Zhou center in Fig. 1.
Fig. 3 is the enlarged diagram of another angle of the camera lens carrier of the optical anti-vibration voice coil motor that can change Yi Zhou center in Fig. 2, the first shell fragment and pressure ring.
Fig. 4 is the annexation schematic diagram of the camera lens carrier of the optical anti-vibration voice coil motor that can change Yi Zhou center in Fig. 2, pressure ring and base.
Fig. 5 a is the optical anti-vibration voice coil motor that can change Yi Zhou center in Fig. 1 at the structural representation moving axle Qian Yizhou center, spring center and optical axis.
Fig. 5 b is the optical anti-vibration voice coil motor that can change Yi Zhou center in Fig. 1 at the structural representation moving axle Hou Yizhou center, spring center and optical axis.
Fig. 5 c is that the optical anti-vibration voice coil motor that can change Yi Zhou center in Fig. 1 is before moving axle and move the relation schematic diagram of axle Hou Yizhou center and spring center.
Fig. 6 a is the stabilization effect schematic diagram of the Yi Zhou center that can change the optical anti-vibration voice coil motor at Yi Zhou center when optical centre in Fig. 1.
Fig. 6 b be the Yi Zhou center that can change the optical anti-vibration voice coil motor at Yi Zhou center in Fig. 1 in image sensors the heart time stabilization effect schematic diagram.
Fig. 7 is the vertical view of optical anti-vibration voice coil motor before moving axle that can change Yi Zhou center in Fig. 1.
Fig. 8 is the cutaway view of optical anti-vibration voice coil motor before moving axle that can change Yi Zhou center in Fig. 7.
Fig. 9 is the vertical view of optical anti-vibration voice coil motor after moving axle that can change Yi Zhou center in Fig. 1.
Figure 10 is the cutaway view of optical anti-vibration voice coil motor after moving axle that can change Yi Zhou center in Fig. 9.
Figure 11 is the structural representation that the moving structure that can change the optical anti-vibration voice coil motor at Yi Zhou center in Fig. 1 is affected by gravity.
Figure 12 is the structural representation that can change the optical anti-vibration voice coil motor at Yi Zhou center that second embodiment of the invention provides.
Figure 13 is the schematic flow sheet that can change the assembly method of the optical anti-vibration voice coil motor at Yi Zhou center that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to shown in Fig. 1 to Fig. 4, the optical anti-vibration voice coil motor 100 at what first embodiment of the invention provided can change Yi Zhou center comprises base 110, pressure ring 120, first shell fragment 130, camera lens carrier 140, magnet group 150, second shell fragment 131 and shell 160.Wherein, described pressure ring 120, described first shell fragment 130, described camera lens carrier 140, described second shell fragment 131 and described magnet group 150 are all arranged in the box body formed by described base 110 and described shell 160.
Particularly, described base 110 comprises substrate 112, the location division 114 be formed on described substrate 112, and from the stage portion 118 that the inner surface of described substrate 112 extends internally.In the embodiment shown in Figure 2, described location division 114 comprises multiple bulge-structure (non-label) protruded towards described camera lens carrier 140 from described substrate 112, locates and/or position-limiting action (hereinafter will be described further) for coordinating with the location notch 147 (as shown in Figure 4) on described camera lens carrier 140 to play.The middle part of described substrate 112 is formed with through hole 116, described stage portion 118, for being arranged in the circular step structure of described through hole 116, can be used for coordinating with described pressure ring 120 and described camera lens carrier 140 and plays dust-proof etc. acting on (hereinafter will be described further).In addition, described base 110 also has the conductive part be electrically connected as printed circuit board (PCB) etc. with external module.
Described pressure ring 120 is arranged between described base 110 and described first shell fragment 130.The matrix 122 that described pressure ring 120 comprises ring-type and the extension 124 be formed on described matrix 122.Described first shell fragment 130 is pressed in the below of described camera lens carrier 140 by described matrix 122, and is connected with shell fragment 130 as utilized glue etc. by mechanical connection manner.For thinner described first shell fragment 130, the thickness of described matrix 122 is thicker, can effectively protect thinner described first shell fragment 130 to strengthen the anti-dropping power of described first shell fragment 130.And, described matrix 122 can ensure that described first shell fragment 130 is driven plain below described camera lens carrier 140, the problems such as the movable inclined and initial current error of the focusing that is that cause because described first shell fragment 130 is uneven can be reduced, increase the consistency of described voice coil motor 100 and produce yield.
Described multiple extension 124 is spaced apart and arranged on the inner surface of described matrix 122 along the circumference of described matrix 122.Each extension 124 comprises the first extension 1241 and the second extension 1243.Described first extension 1241 extends upwardly to the top of described matrix 122 from described matrix 122, namely extend towards described camera lens carrier 140 and extend in breach 148 (as shown in Figure 4) corresponding on described camera lens carrier 140; Described second extension 1243 extends downward the below of described matrix 122 from described matrix 122, namely extend towards described base 110 and extend to contact with the stage portion 118 on described base 110.Like this, described first extension 1241 and described second extension 1243 coordinate with described breach 148 and described stage portion 118 respectively, thus the gap significantly reduced between described camera lens carrier 140 and described base 110, can prevent outside dust from entering the filter or image sensor that pollute below described camera lens carrier 140 below described camera lens carrier 140 from the gap between described camera lens carrier 140 and described base 110, and then strengthen the reliability of described camera model.
Described camera lens carrier 140 comprises body 141, boss 143, upper wrapping post and lower wrapping post (non-label), coil 145, the 3rd extension 149 and above-mentioned location notch 147 and breach 148.Wherein, described body 141 is hollow annular structure, its inwall can with camera lens compact siro spinning technology, allow camera lens can do multivariant activity, cause auto-focusing and optical anti-vibration function to reach.Described boss 143 is formed in the outer surface of described body 141.Upper wrapping post and lower wrapping post are formed in the upper/lower terminal of described body 141.Described multiple absolute coil 145 can be 3,4 or more.In the present embodiment, described coil 145 is three, on the outer wall that described three coils 145 are separately positioned on described body 141 and respectively a corresponding magnet group 150, and links together with described body 141 and form bascule.Described coil 145 is coiled into by live wire, and each coil 145 has the first line end and the second line end.
Described location notch 147 is formed in the outer surface of described body 141, and arranges with described location division 114 one_to_one corresponding.Described location division 114 coordinates with corresponding described location notch 147, plays location and/or position-limiting action, ease of assembly and location.Described breach 148 and described 3rd extension 149 are formed in the inner surface of described body 141, and described breach 148 and described 3rd extension 149 are arranged alternately along the circumference of described body 141.Described 3rd extension 149 to extend towards described stage portion 118 from described body 141 and contacts with described stage portion 118.Like this, described first extension 1241 coordinates with described breach 148, simultaneously, described second extension 1243 and described 3rd extension 149 to be arranged alternately and along the circumference of described body 141 and described stage portion 118 Continuous Contact along the circumference of described body 141, thus the gap significantly reduced between described camera lens carrier 140 and described base 110, can prevent outside dust from entering the below of described camera lens carrier 140 from the gap between described camera lens carrier 140 and described base 110 and the filter polluted below described camera lens carrier 140 or image sensor, and then strengthen the reliability of described camera model.
Described first shell fragment 130 is arranged at the below (as shown in Fig. 2 and Fig. 5-9) of described camera lens carrier 140.A described part for first shell fragment 130 and the end face of described base 110 are mechanically connected, and are electrically connected with the conductive part of described base 110; Another part of described first shell fragment 130 is connected with the bottom mechanical of described magnet group 150.Described first shell fragment 130 is provided with at least three conductive paths, and described first line end on described coil 145, described second line end are electrically connected with the two ends of described conductive path respectively.Like this, the conductive part in described coil 145 and described base 110 connects directly or indirectly by described first shell fragment 130 on circuit.
Described second shell fragment 131 is arranged at the top (as shown in Fig. 2 and Fig. 7-8) of described camera lens carrier 140.Described second shell fragment 131 is connected with the top mechanism of described magnet group 150.Described second shell fragment 131 is provided with conductive path, and described first line end on described coil 145, described second line end are electrically connected with the two ends of described conductive path respectively.
Described magnet group 150 is fixed on the inwall of described shell 160, the motionless structure of composition and described magnet group 150, described shell 160 and described base 110 link together.The number of described magnet group 150 is identical with the number of described coil 145, and each magnet group 150 is all oppositely arranged with a coil 145.The number of described magnet group 150 can be 3,4 or more.In the present embodiment, the number of described magnet group 150 is 3.Each magnet group 150 comprises the first magnet 152 and the second magnet 154.Described first magnet 152 and described second magnet 154 are folded on the direction being approximately perpendicular to described base 110 to be established.In the present embodiment, described first magnet 152 is arranged on described base 110, and described second magnet 154 to be arranged on described first magnet 152 and to contact with described shell 160.The magnetic direction of described first magnet 152 and described second magnet 154 is contrary, and namely in described first magnet 152 and described second magnet 154, the magnetic direction of is towards described camera lens carrier 140, and another is described camera lens carrier 140 dorsad.Shape, the large I of described first magnet 152 and described second magnet 154 adjust according to actual needs, can be the same or different to meet the different needs.Described first magnet 152 and described second magnet 154 can be magnetite.Described first shell fragment 130 is connected with the bottom surface of described first magnet 152, and described second shell fragment 131 is connected with the end face of described second magnet 154.
Shown in please refer to the drawing 5a to Fig. 6 b, the operation principle of brief description voice coil motor 100.
As mentioned above, the body 141 of described coil 145 and described camera lens carrier 140 links together, composition bascule; Described magnet group 150, described shell 160 and described base 110 link together and form motionless structure; Described first shell fragment 130, described second shell fragment 131 connect described camera lens carrier 140 and motionless structure, can form a multivariant mass-spring system.The inwall of the described camera lens carrier 140 in described bascule can with camera lens compact siro spinning technology, allow camera lens can do multivariant activity, to reach auto-focusing and optical anti-vibration function; Described case for lense contains at least a slice lens.As shown in Fig. 5 a-6b, multivariant mass-spring system comprises a spring pivot 170 (claiming spring center afterwards), and when there being a moment to be applied in described system, described system can be rotated around spring center 170; By adjusting the spring constant of the first shell fragment 130 and described second shell fragment 131 described in mass-spring system, the position of described spring center 170 can be adjusted.By adjusting position and the size shape of described coil 145, and the position of described first magnet 152 and described second magnet 154 and size shape, position and direction that each coil 145 electromagnetism after powered up makes a concerted effort can be adjusted.
Time on the optical axis direction of described voice coil motor 100 (focus target in infinity to microspur) and motor in impulse stroke, each coil 145 electromagnetism resultant direction is after powered up adjusted to and tilts upward (as the example of in accompanying drawing 5a and 5b) or be tilted to down, and optical axis is not parallel.In addition, the electromagnetism of described each coil 145 direction of making a concerted effort can not towards or described spring center 170 dorsad.By adjusting size of current and the direction of each coil 145, the size of making a concerted effort described in can adjusting and direction, (moving structure is toward the displacement in z direction to reach focusing; Z-axis is consistent with the direction of optical axis) and optical anti-vibration (R
xand R
ythe inclined light shaft in direction, rear title moves axle) effect.
When auto-focusing is closed and optical anti-vibration is opened, the moving structure comprising camera lens there will be following situation: 1) moving structure is hardly to the displacement of z direction, only can to R
xand R
ydirection tilts; 2) because of total component that can comprise x and y direction with joint efforts that all electromagnetism are made a concerted effort, spring center is caused toward the displacement of x and y direction so can reach; 3) describedly always can make the moment acting on moving structure with joint efforts, reach and cause the moving structure comprising camera lens and rotate around spring center; 4), after described displacement and the rotation situation of the 3rd (the 2nd and) being integrated, in fact moving structure and camera lens optical axis can rotate around a point, and this point is called Yi Zhou center.By adjusting the direction that each coil electromagnetism is made a concerted effort, x and the y direction spring constant of oscillator spring system (is namely k
xand k
y), and R
xand R
ydirection spring constant (is namely к
xand к
y), the position at Yi Zhou center can be adjusted.Shown in please refer to the drawing 5c, suppose that total electromagnetism of all coils makes a concerted effort to be f; The x durection component of f is f
x; The R that f makes for spring center
yyawning moment is τ
y.Described spring center is toward the displacement (d in x direction
x), f
xand k
xrelation be: d
x=f
x/ k
x(1); Y-moves shaft angle degree (θ
y), τ
yand к
yrelation be: θ
y=τ
y/ к
y(2); Distance (D between Yi Zhou center and spring center
z) be: D
z=d
x/ tan θ
y≈ d
x/ θ
y(because θ
yvery little, be generally less than 3 degree)=f
xк
y/ k
xτ
y(substituting into equation (1) and (2)) (3).
Adjust the direction that each coil electromagnetism is made a concerted effort, can f be changed
xand τ
yrelation; Adjust the design of each piece of shell fragment, can к be changed
yand k
xrelation.According to equation (3), by adjustment f
x, к
y, k
xand τ
y, be namely the design of the direction of making a concerted effort and shell fragment described in adjustment, position (and the D of Yi Zhou center relative to spring center can be adjusted
zrelevant).
Accompanying drawing 6a describes the stabilization effect of Yi Zhou center when optical centre.Before shake, be imaged on the center of image sensor; After shake, imaging deviate from the center of image sensor; After moving axle (being namely that optical axis rotates around optical centre), because therefore optical centre and imaging do not move, so cannot the migration imagery made of compensate for jitter, fail to reach and cause stabilization effect.Accompanying drawing 6b describe when Yi Zhou center in image sensors the heart time stabilization effect.After moving axle, the position (being namely image sensor center) before imaging can return shake, therefore can reach stabilization effect.So move axle center and stabilization effect has much relations, Yi Zhou center is unfavorable for stabilization effect close to optical centre.Therefore, Yi Zhou center preferably can away from optical centre.
The diamagnetic interference optical anti-vibration voice coil motor of the present embodiment, possesses at least three group magnetites and at least three coils, can support the function of three-dimensional auto-focusing and optical anti-vibration simultaneously.Such as, when the quantity of coil and magnetite group is three, suppose that optical center is center, camera lens looks up, and three groups of magnetites, three groups of coils are distributed in 0,120 and 240 degree of direction respectively.When three coils Impact direction upwards, when size is identical, when camera lens is along optical axis displacement.When camera lens needs to tilt to 0 degree of direction, the power being positioned at the coil of 0 degree diminishes, and remaining power then becomes large.When camera lens needs to tilt to 60 degree of directions, the power being positioned at the coil of 240 degree becomes large, and remaining power then diminishes.
Please Fig. 7 and Fig. 8, show described voice coil motor 100 while being closed (be optical anti-vibration) when impulse stroke and before moving axle, the electromagnetic force acting on described coil 145 by four (two groups) magnetites forms two (f that make a concerted effort
1and f
3) and the position of described spring center 170.By controlling size and the direction of four described coil 145 electric currents, independently can control the size of making a concerted effort in each coil 145 and direction, thus control that camera lens makes both direction move axle (x and y direction, for optical anti-vibration), and a displacement along optical axis (z direction, for auto-focusing).Because the size with joint efforts of each coil 145 closely, so the component of making a concerted effort on x and y direction of each coil 145 cancels each other, the direction of always making a concerted effort of all coils 145 is parallel with described optical axis, makes described camera lens carrier 140 along described optical axis displacement, reaches the effect of auto-focusing.In above embodiment, by adjusting described first magnet 152 and the described size of the second magnet 154 and the position of described coil 145, thus make f with joint efforts
1and the f that makes a concerted effort
3tilt upward, towards described optical axis, but be not towards or described spring center 170 dorsad.In addition, described spring center 170 is large about the center of described camera lens carrier 140.
Please refer to the drawing 9 and Figure 10, show described voice coil motor 100 while being opened (be optical anti-vibration) when impulse stroke and after moving axle, two (f that make a concerted effort
1and f
3), the position at described spring center 170 and described Yi Zhou center 180.In such cases, the described f that makes a concerted effort
3become large, the described f that makes a concerted effort
1diminish, all the other sizes of making a concerted effort are constant.Therefore, described spring center 170 is to the displacement of x positive direction, and deflection appears in described optical axis.Thus described camera lens carrier 140 and described optical axis are rotated around described Yi Zhou center 180, described Yi Zhou center 180 fades to the below of described spring center 170, and exceed described first shell fragment 130 and described second shell fragment 131 position and close to the position of described image sensor.
Please refer to the drawing 11, shows that described spring center 170 is close to the benefit comprising lens moving structural focus 182.In the case, when camera lens is towards horizontal direction, the position of moving structure center of gravity 182 and described spring center 170 closely, gravity f
gthe moment acting on the formation of described spring center 170 place is very little, and the inclination causing described optical axis 181 to produce is also very little.Therefore, gravity f
gcan be left in the basket on the impact of image edge resolution, thus can effectively be lifted at different directions take pictures under image edge resolution.
Shown in please refer to the drawing 12, for the structural representation that can change the optical anti-vibration voice coil motor at Yi Zhou center that second embodiment of the invention provides, the similar of the voice coil motor 100 in the structure of the voice coil motor 100a in the present embodiment and the first embodiment, difference is: the voice coil motor 100a in the present embodiment is only provided with the first shell fragment 130a of the below being positioned at described camera lens carrier 140a, and be provided with in other positions of described camera lens carrier 140a elastic piece structure is set, to reduce production difficulty and cost.Other structures in the present embodiment are identical with the structure in the first embodiment, do not repeat them here.
In addition, in other embodiments, also pressure ring can be omitted.In other embodiments, displacement transducer can be increased further, such as hall effect sensor, allow and use close-loop control mode to drive the optical anti-vibration voice coil motor that can change Yi Zhou center, reach and cause auto-focusing or optical anti-vibration effect.
Shown in please refer to the drawing 13, it is a kind of assembly method that can change the optical anti-vibration voice coil motor at Yi Zhou center that the embodiment of the present invention provides.This assembly method comprises:
Step S200: live wire is formed coil 145 on the wrapping post on camera lens carrier 140 and boss 143;
Step S202: the first shell fragment 130 is placed on below described camera lens carrier 140, and make the wrapping post below described camera lens carrier 140 through the hole on described first shell fragment 130;
Step S204: described first shell fragment 130 and described camera lens carrier 140 are mechanically connected;
Step S206: described first shell fragment 130 is carried out circuit with live wire and is connected;
Step S208: below pressure ring 120 being placed on the first shell fragment 130, and be mechanically connected;
Step S210: the top described first shell fragment 130 being placed on base 110, is then mechanically connected described first shell fragment 130 with described base 110, then is electrically connected with the conductive part on described base 110 by described first shell fragment 130;
Step S212: magnet group 150 be fixed on the inwall of shell 160, is placed in described shell 160 inner, and guarantees that each coil 145 is all relative with a magnet group 150 by described camera lens carrier 140;
Step S214: the bottom of described first shell fragment 130 and the first magnet 152 is mechanically connected;
Step S216: the top the second shell fragment 131 being placed on described camera lens carrier 140, and make the wrapping post above described camera lens carrier 140 through the hole on described second shell fragment 131, described second shell fragment 131 and described camera lens carrier 140 are mechanically connected, more described second shell fragment 131 is carried out circuit with live wire are connected.
The optical anti-vibration voice coil motor that can change Yi Zhou center in the embodiment of the present invention and assembly method thereof at least have some beneficial effect following:
(1) by size and the direction of electric current in the described coil 145 of control four, independently can control the size of making a concerted effort in each coil 145 and direction, thus control translation (x and the y direction that camera lens can make both direction, for optical anti-vibration), and (z a direction of the displacement along optical axis 180, for auto-focusing), therefore, the optical anti-vibration voice coil motor 100 that can change Yi Zhou center can support auto-focusing and optical anti-vibration simultaneously;
(2) magnet group 150 is arranged in motionless structure, so the performance that can change the optical anti-vibration voice coil motor 100 at Yi Zhou center is not easy to affect by extraneous magnetic field;
(3) the optical anti-vibration voice coil motor 100 that can change Yi Zhou center adopts camera lens translation mode, can reach and cause optical anti-vibration effect, and lowers the impact on image edge resolution;
(4) by arranging pressure ring 120, for thinner shell fragment 130, the thickness of matrix 122 is thicker, can effectively protect thinner shell fragment 130 to strengthen anti-dropping power; And, pressure ring 120 can ensure that shell fragment 130 is driven plain below camera lens carrier 140, the problems such as the movable inclined and initial current error of the focusing caused because shell fragment 130 is uneven can be reduced, increase the consistency that can change the optical anti-vibration voice coil motor 100 at Yi Zhou center and produce yield;
(5) by making the first extension 1241 coordinate with breach 148, to be arranged alternately and along the circumference of body 141 and stage portion 118 Continuous Contact along the circumference of body 141 with seasonal second extension 1243 and the 3rd extension 149, thus the gap significantly reduced between camera lens carrier 140 and base 110, can prevent from outside dust from entering from the gap between camera lens carrier 140 and base 110 polluting below camera lens carrier 140 filter below camera lens carrier 140 or image sensor, and then strengthen the reliability of described camera model;
(6) structure is simple, can improve motor reliability and lower production difficulty and cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. can change the optical anti-vibration voice coil motor at Yi Zhou center, it is characterized in that: comprise base, at least one shell fragment, camera lens carrier, at least three magnet groups and shell; Each magnet group at least comprises a magnet; Wherein, described base, described shell and described magnet group link together and form motionless structure; Described at least three magnet groups are arranged on the inwall of described shell; The coil that described camera lens carrier comprises body and arranges on the body; Described coil and described body link together, composition bascule; The number of described coil is identical with the number of described magnet group; Described coil and described magnet group are oppositely arranged one by one, and described coil is provided with the first line end and the second line end; At least one shell fragment described connects described camera lens carrier and described magnet group and forms a multivariant mass-spring system, and described multivariant mass-spring system comprises a spring center; Described shell fragment is provided with at least three conductive paths, described first line end and described second line end are electrically connected with the two ends of described conductive path respectively; At least one shell fragment described directly or indirectly connects the electric conducting material in described coil and described base on circuit; The electromagnetism of each coil direction of making a concerted effort neither towards also not described spring center dorsad, and and camera lens optical axis not parallel; In optical anti-vibration process, camera lens carrier is around moving axle center rotating, and described Yi Zhou center and spring center are at diverse location.
2. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 1, it is characterized in that, each magnet group comprises the first magnet and the second magnet; Described first magnet is arranged on described base; Described second magnet is folded to be located on described first magnet, and size or the shape of described first magnet and described second magnet are different, and the magnetic direction of described first magnet and described second magnet is contrary.
3. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 1, it is characterized in that, described base is formed with location division; Described camera lens carrier also comprises formation location notch on the body; Described location division coordinates with described location notch.
4. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 2, it is characterized in that, at least one shell fragment described comprises the first shell fragment, and a part for described first shell fragment is connected with the bottom of described base and described body; Another part of described first shell fragment is connected with the bottom of described first magnet.
5. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 2, it is characterized in that, at least one shell fragment described comprises the first shell fragment and the second shell fragment, a part for described first shell fragment is connected with the top of described base, and another part of described first shell fragment is connected with the bottom of described first magnet; Described second shell fragment is connected to the top of described camera lens carrier, and the top of described second shell fragment and described second magnet and described shell are connected.
6. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 5, it is characterized in that, also comprise pressure ring; Described pressure ring is arranged between described base and described first shell fragment; Described first shell fragment is pressed in the below of described camera lens carrier by described pressure ring, and is connected with described first shell fragment.
7. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 6, it is characterized in that, the matrix that described pressure ring comprises ring-type and the multiple extensions formed on the matrix; Described shell fragment is pressed in the below of described camera lens carrier by described matrix, and is connected with described shell fragment; Described camera lens carrier also comprises formation multiple breach on the body; Described substrate is formed with through hole; Described base also comprises the stage portion extended internally from the inner surface of described substrate; Described multiple extension is spaced apart and arranged on the inner surface of described matrix along the circumference of described matrix; Each extension comprises the first extension and the second extension; Described first extension to extend towards described camera lens carrier from described matrix and extends in breach corresponding on described camera lens carrier; Described second extension extends from described matrix towards described base and extends to and contacts with the described stage portion on described base.
8. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 7, it is characterized in that, described camera lens carrier also comprises formation multiple 3rd extensions on the body; Described breach and described 3rd extension are arranged alternately along the circumference of described body; Described 3rd extension to extend towards described stage portion from described body and contacts with described stage portion.
9. can change the optical anti-vibration voice coil motor at Yi Zhou center as claimed in claim 8, it is characterized in that, described second extension and described 3rd extension to be arranged alternately and along the circumference of described body and described stage portion Continuous Contact along the circumference of described body.
10., as the assembly method that can change the optical anti-vibration voice coil motor at Yi Zhou center in claim 6-9 as described in any one, comprising:
Live wire is formed described coil on the wrapping post on described camera lens carrier and boss;
Described first shell fragment is placed on below described camera lens carrier, and makes the wrapping post below described camera lens carrier through the hole on described first shell fragment;
By described first shell fragment and described camera lens carrier mechanical connection;
Described first shell fragment and described live wire are carried out circuit connection;
Described pressure ring is placed on below described first shell fragment, and is mechanically connected;
Described first shell fragment is placed on above described base, described first shell fragment and described base are mechanically connected, more described first shell fragment is electrically connected with the conductive part on described base;
Described magnet group is fixed on the inwall of described shell, described camera lens carrier is placed in described enclosure, and guarantee that each coil is all relative with a magnet group;
The bottom of described first shell fragment and described first magnet is mechanically connected;
Described second shell fragment is placed on the top of described camera lens carrier, and make the wrapping post above described camera lens carrier through the hole on described second shell fragment, by while described second shell fragment and described camera lens carrier mechanical connection, described first shell fragment and described live wire are carried out circuit connection.
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| CN201510622131.8A CN105099119B (en) | 2015-09-25 | 2015-09-25 | It is a kind of to change the optical anti-vibration voice coil motor and its assembly method for moving axis center |
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| CN201510622131.8A CN105099119B (en) | 2015-09-25 | 2015-09-25 | It is a kind of to change the optical anti-vibration voice coil motor and its assembly method for moving axis center |
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| CN105099119B CN105099119B (en) | 2018-06-26 |
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