CN105759391A - Lens driving device and camera module provided with lens driving device - Google Patents
Lens driving device and camera module provided with lens driving device Download PDFInfo
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- CN105759391A CN105759391A CN201410795644.4A CN201410795644A CN105759391A CN 105759391 A CN105759391 A CN 105759391A CN 201410795644 A CN201410795644 A CN 201410795644A CN 105759391 A CN105759391 A CN 105759391A
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Abstract
The invention relates to a lens driving device and a camera module provided with the lens driving module. The lens driving device and the camera module may include a coil frame provided with a lens unit arranged in the coil frame and coils arranged on a pair of opposite outer surfaces respectively; two magnets arranged outside the coil frame in a manner of facing the coils and configured for forming a magnetic field; a retaining piece provided with an opening formed in the upper surface of the retaining piece for exposing the lens unit and coupled to the upper side of the coil frame for mounting the magnet on the side face of the retaining piece; and a first and a second elastic component arranged on the upper side and the lower side of the retaining piece respectively to supporting the upper side and the lower side of the coil frame. When power is supplied to the coils, a driving force formed due to interaction with the magnets is generated in the coils, so that the lens unit and the coil frame are driven. The elastic components may have an elastic coefficient of 50 mN/mm or smaller. The drive displacement value of the lens unit and the coil frame may be 3 [mu]m/mA or greater and 8 [mu]m/mA or smaller as to the unit current 1mA.
Description
Technical field
The present invention relates to a kind of lens driver and there is the camera model of this lens driver.
Background technology
Executor's (actuator, actuator) for automatically focusing on includes utilizing the voice coil actuator (VCA) of Lorentz force and utilizes the piezo actuator of piezoelectric effect of piezoelectricity (piezo, piezoquartz).
This VCA has simple structure, and has superiority on its cost, and this piezo actuator drives at it and has advantage in stability and energy expenditure.
Due to the price of this VCA, thus it is used for the camera that resolution is relatively low, and this piezo actuator is mainly used in high-resolution camera.
In Korean Patent, 10-2012-0110436 (camera model (CameraModule) is disclosed；On October 10th, 2010 Patent Publication) in disclose the correlation technique of the present invention.
Summary of the invention
The present invention is provided with a kind of lens driver of price competitiveness and a kind of camera model with this device.
According to an aspect of the present invention, providing a kind of lens driver, this lens driver includes: bobbin (bobbin, winding wire coil, shuttle), this bobbin have the lens unit being accommodated within and having become respectively one to faced by outer surface on coil；Two magnets, are arranged in the outside of bobbin with towards coil, and these two magnets are configured for formation magnetic field；Keeper, has the opening being formed thereon surface to expose described lens unit, and this keeper is coupled to the upside of bobbin thus being installed on its lateral surface by magnet；And first elastic component and the second elastic component, it is arranged in above and below keeper, to support the upper side and lower side of bobbin.When electric power is supplied to coil, the driving force formed by interacting with magnet can be produced in coil, thus driving lens unit and bobbin.Elastic component can be formed to have the coefficient of elasticity of 50mN/mm (cattle/millimeter) or less, and the drive displacement value for the unitary current of 1mA (milliampere), lens unit and bobbin can be 3 μm/mA (micron/milliampere) or more and 8 μm/mA or less.
At this, the number of turns that coil is all wound around 100 circles or more and 125 circles or less between, thus increasing the effective length of coil being arranged in the magnetic field formed by described magnet.
Magnet is all formed as the thickness with 0.5mm (millimeter) or bigger, in this way, enhance the intensity in the magnetic field formed by each magnet in magnet, and the spacing between a coil in coil and a magnet in magnet can be 0.1mm or less, increases the magnetic density affecting coil in this way.
First elastic component can be formed with the thickness of 0.04mm or less, and the second elastic component can be formed with the thickness of 0.03mm or less, by this way, coefficient of elasticity is regulated by reducing the hardness of each in the first elastic component and the second elastic component.
Keeper can have the side panel being formed thereon, this side panel cover bobbin except towards the outer surface except the outer surface of magnet, strengthening the structural rigidity of keeper in this way.
Bobbin can have the multiple juts being formed thereon surface, and keeper can have the multiple stopper slots (stoppergroove, locking groove) being formed thereon surface, and described jut is inserted and fixed to described stopper slot in this way.
This lens driver also includes: housing, is arranged in the lower section of bobbin, for coupling with keeper；And printed circuit board (PCB), it is arranged in the lower section of bobbin, for coil is supplied electric power.
According to another aspect of the present invention, it is provided that a kind of camera model, this camera model includes: lens unit, and this lens unit has lens and the lens drum being mounted within；Bobbin, by lens unit house within it and have be respectively formed at one to faced by outer surface on coil；Two magnets, these two magnets are arranged in the outside of bobbin with towards coil and be configured to form magnetic field；Keeper, has the opening being formed thereon on surface to expose lens unit and to be coupled to the upside of bobbin to be fixed on its side by magnet；And first elastic component and the second elastic component, it is arranged in above and below keeper, in order to support the upper side and lower side of bobbin.When electric power is supplied to coil, produce by interacting the driving force that formed with magnet in coil, thus driving lens unit and bobbin.Lens drum may be formed to have 80mg (milligram) or less weight so that the action of foundation lens unit and bobbin is to limit the change of driving force, and may be structured to 0.1m (rice) or bigger with the corresponding focal length that drives of lens unit and bobbin.
At this, elastic component can be formed to have the coefficient of elasticity of 50mN/mm or less, and the drive displacement value for the unitary current of 1mA, lens unit and bobbin can be 3 μm/mA or bigger and 8 μm/mA or less.
First elastic component can be formed with the thickness of 0.04mm or less, and the second elastic component can be formed with the thickness of 0.03mm or less, by this way, described coefficient of elasticity is regulated by reducing the hardness of each in the first elastic component and the second elastic component.
Accompanying drawing explanation
Fig. 1 is the decomposition diagram illustrating camera model according to an embodiment of the invention.
Fig. 2 is the perspective view illustrating camera model according to an embodiment of the invention.
Fig. 3 is the viewgraph of cross-section of the lens driver intercepted along the I-I line of Fig. 2.
Fig. 4 is the chart of the displacement of the lens unit that the intensity of the electric current illustrating to flowing through coil is relevant.
Fig. 5 is the perspective view of the coupling structure illustrating keeper according to an embodiment of the invention and bobbin.
Detailed description of the invention
Hereinafter, to the lens driver according to the present invention in conjunction with accompanying drawing and will there is the camera model of this lens driver it is described in detail.In conjunction with in the description of this invention of accompanying drawing, any identical or corresponding element will be designated as identical reference number, and not provide the description of its redundancy.
Term such as " first " and " second " can be used for describing different elements, but said elements should not be limited to above-mentioned term.Above-mentioned term is only for distinguishing an element with another element.
When an element is described as " coupling " to another element, do not imply that the direct contact of only physics between these components, but also should include another element being likely to insert between these components, and each of these elements contacts with another element described.
Fig. 1 is the exploded view illustrating camera model 100 according to an embodiment of the invention, and Fig. 2 illustrates the perspective view under the assembling morphology of the camera model 100 that figure 1 illustrates.
Camera model 100 according to the present embodiment can include lens unit 110,120, two magnets 130 of bobbin, keeper 140 and the first flexible member and the second elastic component 150,160.In the present embodiment, for driving 120, two magnets 130 of bobbin of this lens unit 110, keeper 140 and the first elastic component and the second elastic component 150,160 to be collectively referred to as lens driver.
This lens unit 110 can be made up of single lens or multiple lens and lens drum.This lens unit 110 is the part of light transmission.As shown in FIG. 1, this lens drum can be configured to cylindricality, however itself and should not necessarily be limited to shape illustrated herein and this lens drum can be formed as multiple polygon.
This bobbin 120 is that lens unit 110 houses part within it, and this bobbin have formed one to faced by outer surface on coil.This bobbin 120 can have the accommodation hole for holding this lens unit 110 formed within it.
Additionally, the inwall in the surface, outside of this lens drum and this accommodation hole can have screw thread, couple for by lens drum and bobbin 120 screw thread.Alternatively, the surface, outside of this lens drum can be configured to have ladder difference (steppeddifference), and the inwall in this accommodation hole can be configured to have the ladder difference corresponding with formation ladder difference on the surface, outside of lens drum so that lens drum and bobbin 120 mechanically fit together.
With reference to Fig. 1, rectangle can be configured to according to the bobbin 120 of the present embodiment, and its four angles all can from two adjacent surface chamferings.Thus, this bobbin 120 can be configured to have the octagonal shape being made up of four pairs of surfaces faced out.
This coil is respectively formed on the outer surface faced by a pair.This coil all can be wound around and be formed on the outer surface of bobbin 120 and this coil has electric power and flows through the electric current of this coil, and this electric power supplies by being connected to the electrode of this coil.
As shown in FIG. 1, including two magnets 130 according to the lens driver of the present embodiment, these two magnets are formed in the outside of bobbin 120 with towards forming the coil on bobbin 120, and these two magnets are configured to form magnetic field.
In other words, these two magnets 130 are by being inserted in bobbin 120 between the two and face each other ground is spaced apart.Therefore, these two magnets 130 can towards forming coil on the outer surface of bobbin 120, and this coil can be placed in the magnetic field formed by magnet 130.
This keeper 140 according to the present embodiment has the formation opening 141 at its end face to expose the lens unit 110 being contained in bobbin 120, and this keeper is coupled to the upside of bobbin 120 so that two magnets 130 to be fixed on the side of bobbin.
Lens unit 110 and bobbin 120 move up and down relative to keeper 140, and in this case, this lens unit 110 and bobbin 120 are kept part 140 and are protected against the shock of outside.
First elastic component and the second elastic component 150,160 are arranged in the upper side and lower side of keeper 140, in order to support the upper side and lower side of bobbin 120 respectively.This first elastic component and the second elastic component 150,160 may each comprise leaf spring (leafspring, spring leaf, leaf spring).
This first elastic component and the second elastic component 150,160 are configured to support bobbin 120 thus providing the reliability of driving.Such as, this first elastic component 150 may be disposed so that the opening 141 for partly covering keeper 140 and limits this lens unit 110 and bobbin 120 moving up and down relative to this keeper 140.Additionally, this first elastic component and the second elastic component 150,160 can pusher wire coil 120 to provide the initial position of this lens unit 110 and bobbin 120.
Lens driver according to the present embodiment includes two magnets 130.In other words, compared with traditional lens driver including four or more magnet, small number of magnet is employed according to the lens driver of the present embodiment.While it is true, as below in conjunction with Fig. 3 and Fig. 4, by, described by mathematical equation, the characteristic identical with traditional lens driving apparatus and performance can be kept according to the lens driver of the present embodiment.
Fig. 3 is the viewgraph of cross-section of the lens driver according to an embodiment of the invention observed along the I-I line of Fig. 2, and Fig. 4 is the chart of the displacement illustrating the lens unit 110 relevant to the intensity of the electric current of flowing through coil 122.
With reference to Fig. 3, this first elastic component and the second elastic component 150,160 are installed as and have initial deformation value (Δ d).As described above, this is in order to by supporting reliability and stability lens unit 110 being housed bobbin 120 within it and provide driving, and is make this lens unit 110 be maintained at initial position to press this bobbin 120.
Owing to two magnets 130 are arranged as respectively for coil 122, thus this coil 122 can be placed in the magnetic field formed by magnet 130.It is supplied to by being connected to the electrode of coil 122 once electric power, is then produced for driving lens unit 110 and the driving force of bobbin 120 in coil 122 by the interaction of coil and magnet 130.
This driving force is formed according to the principle producing Lorentz force.Owing to the size of Lorentz force is directly proportional to the electric current of flowing in coil 122 being placed in magnetic field, thus the current intensity of flowing can be conditioned to determine the position of lens unit 110 in coil 122.
In other words, by magnet 130 and in coil 122 interaction between the electric current of flowing and produce in coil 122 size and the intensity (that is, magnetic density) in magnetic field of driving force, coil 122 length and in coil 122 electric current of flowing be directly proportional.This can be expressed as F1=B L I with mathematical equation, and wherein F1 is the power produced in coil 122, and B is the intensity in magnetic field, and L is the length of coil 122, and I is the current intensity of flowing in coil 122.
With reference to Fig. 3, this first elastic component and the second elastic component 150,160 be installed to be have initial deformation value (Δ d) and with this deformation opposite direction on press this bobbin 120.In figure 3, due to this first elastic component and the upper deformation of the second elastic component 150,160 (D1) in a first direction, therefore this first elastic component and the second elastic component 150,160 are at second direction (D2) this bobbin 120 of upper pressing.
The power being pressed this bobbin 120 by the first elastic component and the second elastic component 150,160 is directly proportional to the coefficient of elasticity of the first elastic component and the second elastic component 150,160 and the deformation values (Δ d) of the first elastic component and the second elastic component 150,160.It can be expressed as F2=k Δ D with mathematical equation, wherein F2 is the power that the first elastic component and the second elastic component 150,160 press this bobbin 120, k is the first elastic component and the coefficient of elasticity of the second elastic component 150,160, and Δ D is the first elastic component and initial deformation value (Δ d) of the second elastic component 150,160.
In addition, applied to being expressed as F3=M g with mathematical equation by this bobbin 120 of drive force and the power of lens unit 110 by gravity, wherein F3 applies the gravity to bobbin 120 and lens unit 110, M is the gross mass of this bobbin 120 and the coil 122 formed on this bobbin and lens unit 110, and g is acceleration of gravity.
With reference to Fig. 3, apply to the direction of bobbin 120 and the gravity of lens unit 110 can be first direction to any one (that is, the D1 to D3) in third direction.By changing the direction pointed by lens driver, that is, the action according to lens unit 110 and bobbin 120, gravity applies to the direction of bobbin 120 and lens unit 110 to be changed.
As described above, owing to including two magnets 130 according to the lens driver of the present embodiment, because being sized to less than power produced by traditional lens driver of power produced by it.That is, at identical conditions, being sized to by having the half or less of power produced by the lens driver of four magnets by power produced by the lens driver of the present embodiment.
But, compare the magnet for traditional lens driver, have been increased so that the magnetic density adding applying to coil 122 according to the size of the magnet 130 of the lens driver of the present embodiment and thickness.Specifically, add about 30% according to the thickness of the magnet 130 of the present embodiment, namely increase at least 0.5mm.
Additionally, each coil 122 be wound around the number of turns 100 circle or more and 125 circle or less between, add 54% than traditional number of turns.But, the internal resistance value of coil can be increased at the increase number of turns not having the upper limit, thus be likely to reduce the current intensity of flowing in coil.
It addition, according in the lens driver of the present embodiment, the spacing between coil 122 and magnet 130 is formed as 0.1mm or less, and this decreases at least 16% compared with traditional spacing, thus adding the magnetic density affecting coil 122.
Therefore, although only include two magnets according to the lens driver of the present embodiment, however can produce by having produced by traditional lens driver of four or more magnet the 70% or more of driving force according to the lens driver of the present embodiment.
For driving the driving force of lens unit 110 not to be limited only by by the impact of the produced power that interacts between magnet 130 and coil 122, but also it is subject to the power of the first elastic component and the second elastic component 150,160 and applies the impact to lens unit 110 and the gravity of bobbin 120.By considering that the computed driving force of the power applied by the power of the first elastic component and the second elastic component 150,160 and gravity refers to effective driving force.
Therefore, according in the lens driver of the present embodiment, although the size of the power produced in coil 122 by the interaction between magnet 130 and coil 122 be reduce the size of compared to produced power in traditional lens driver, but can be inferred that be, consider that the quantity of magnet reduces by half, thus be more efficient according to the lens driver that the lens driver of the present embodiment is more traditional.
Additionally, the produced power reduced affects other of effective driving force because usually overcoming by regulating in coil 122.This will describe in greater detail below.
Example discussed below is not required to consider gravitational effect.It is to say, the driving direction of lens unit 110 is perpendicular to the direction of gravity.
Specifically, in practice to drive lens unit 110, by with magnet 130 interact produced power size need more than the power by the first elastic component and the second elastic component 150,160 pusher wire coil 160.In other words, it is necessary to meet mathematic(al) representation B L I >=k Δ D.
Therefore, according in the lens driver of the present embodiment, although owing to only having two magnets, B L I value is less than the B L I value of traditional lens driver, but by the first elastic component and the second elastic component 150,160 being designed as and there is little coefficient of elasticity, the performance identical with traditional lens driver can be kept according to the lens driver of the present embodiment.
Specifically, in order to reduce the first elastic component and the coefficient of elasticity of the second elastic component 150,160, first elastic component and the second elastic component 150,160 can be formed to have the thickness of 0.04mm or less and 0.03mm or less respectively, and this decreases about 20% to 25% compared with traditional resilient member thickness.
By reducing the thickness of elastic component, it is possible to decrease the hardness of elastic component, and the coefficient of elasticity of elastic component can reach 36% from the minimizing amount of the coefficient of elasticity of traditional elastic component.
Therefore, although the lens driver according to the present embodiment has the number of magnets fewer than traditional lens driver, but the magnetic density formed by each magnet 130 is increased by thickness and the size of increase magnet 130, increase number of turns to increase the effective length of coil 122, and reduce the first elastic component and the coefficient of elasticity of the second elastic component 150,160, and remain the driveability identical with traditional lens driver.
Also just say, can be formed in the mode that the coefficient of elasticity of the first elastic component and the second elastic component 150,160 is 50N/mm or less according to the lens driver of the present embodiment.At this, for the unitary current of the 1mA of flowing in the coil 122 of the lens driver according to the present embodiment, the drive displacement value of lens unit 110 and bobbin 120 can between 3 μm/mA and 8 μm/mA.
In addition, due to the drive displacement value of unitary current be with per unit electric current produced by the ratio of size and coefficient of elasticity of driving force identical, thus the size of driving force produced by per unit electric current 1mA and the ratio according to the first elastic component of the lens driver of the present embodiment and the coefficient of elasticity of the second elastic component 150,160 can represent between 3 μm/mA and 8 μm/mA.This can with being mathematically expressed as 3 μm/mA≤B L/k≤8 μm/mA.
Meanwhile, with reference to Fig. 3 and Fig. 4, it is shown that according to the direction relative to gravitational orientation of lens driver, three situations of the action of lens unit 110 and bobbin 120.
Specifically, these three situation includes: a kind of situation is the direction (situation 1) that the moving direction of lens unit 110 is perpendicular to gravity, a kind of situation is the moving direction (situation 2) in opposite direction with gravity of lens unit 110, and a kind of situation is the moving direction of lens unit 110 consistent with the direction of gravity (situation 3).
Foregoing description is being the situation eliminating gravitational effect according to driving force produced in the lens driver of the present embodiment.It is to say, the powered direction of lens unit 110 is perpendicular to the direction of gravity.This is shown in solid in the diagram.
Direction that the current value of the initial driving of lens unit 110 positions relative to the direction of gravity according to lens driver and change.
Such as, in the situation of the length that figure 4 illustrates dotted line alternately, the moving direction of lens unit 110 is in opposite direction with gravity, for initial driving lens unit 110, it is necessary to produce the power of the power sum applied more than the power pressed by the first elastic component and the second elastic component 150,160 and gravity in coil 122.
This can with being mathematically expressed as B L I >=k Δ D+Mg.Can use when the moving direction of lens unit 110 is consistent with the direction of gravity and be mathematically expressed as B L I >=k Δ D-Mg.
Therefore, different relative to the position of gravity direction according to lens driver for the current value of the initial driving of lens unit 110.As shown in FIG. 4, the current value for the initial driving of each situation is different, and forms the relation of I3≤I1≤I2.
If the difference of current value (I1-I3 or I2-I1) is big, then the reliability driving lens will deterioration.The difference (I1-I3 or I2-I1) of current value is proportional to M value and is inversely proportional to K value.
The coefficient of elasticity of the first elastic component and the second elastic component 150,160 owing to having reduction according to the lens driver of the present embodiment, thus identical characteristic and performance can be kept by correspondingly reducing M value.
It is to say, the lens drum being included in lens unit 110 weight that can be configured to there is 80mg or less so that according to the action of lens unit 110 and bobbin 120 to limit the change of driving force.The weight of the coil 122 and bobbin 120 with the lens unit 110 according to the present embodiment is configured to about 160mg.
In order to reduce the weight of the coil 122 and bobbin 120 with the lens unit 110 according to the present embodiment, eliminate some intrawares of bobbin 120, therefore make it can reduce overall weight and simplify its manufacturing process.
According in the lens driver of the present embodiment, lens unit 110 can move about 9 μm to 114 μm from initial position, and the focal length therefore comprising the camera model 100 of the lens driver according to the present embodiment can be approximately between 0.1m and infinity.
In other words, 0.1m or bigger can be configured to the corresponding focal length that drives of lens unit 110 and bobbin 120.
Additionally, compared with traditional lens driver comprising four magnets, only include two magnets according to the lens driver of the present embodiment and therefore can save manufacturing cost.It addition, by being suitably designed the first elastic component and the coefficient of elasticity of the second elastic component 150,160, the characteristic identical with traditional lens driver and performance can be remained according to the lens driver of the present embodiment.
Fig. 5 is the perspective view of the coupling structure illustrating keeper 140 according to an embodiment of the invention and bobbin 120.
With reference to Fig. 5; the keeper 140 of the lens driver according to the present embodiment has side panel 143; this side panel be formed as cover bobbin 120 except towards the outer surface except the outer surface of magnet, in order to effectively protective wire coil 120 and house lens unit within it and from outside shock.
That is, in traditional lens driver, each side of keeper has the opening formed within it so that fixing four magnets, therefore structural strength is inevitably reduced, but the keeper 140 according to the present embodiment only has the lateral opening 144 formed in each of two sides, and the side panel 143 covering bobbin 120 is formed on remaining side.According to this, the structural strength of keeper 140 itself is strengthened, thus effectively protecting lens driver.
With reference to Fig. 5, although reducing the first elastic component of the lens driver according to the present embodiment and the coefficient of elasticity of the second elastic component for firmer support and the more reliable driving of bobbin 120, but the bobbin 120 according to the present embodiment can include multiple jut 124 and include keeper 140, the plurality of jut is formed as prominent on the upper surface of this bobbin, this keeper can have the corresponding stopper slot 145 being formed on the upper surface of this bobbin, by such mode, the jut 124 of this bobbin 120 inserts and is fixed to this stopper slot.
Although figure 5 illustrates to have and forming four juts 124 on the upper surface of bobbin 120, however the present invention be not restricted to shown here go out four juts, and can have any number of jut 124.But, as shown, by making the position at the corner corresponding to keeper 140 be asymmetrically formed jut 124, this bobbin 120 can by keeper 140 by firmer and more stable in the way of support.
In addition, lens driver according to the present embodiment can also include housing 170 and printed circuit board (PCB) 180, this housing is arranged in the lower section of bobbin 120 and for coupling with keeper 140, and this printed circuit board arrangement is in the lower section of bobbin 120 and for coil is supplied electric power.
Referring again to Fig. 1 and Fig. 2, camera model 100 can also include housing 170, printed circuit board (PCB) 180 and radome (shieldcan, protective cover) 190 according to an embodiment of the invention.
This housing 170 is for housing and part from external impact of protective wire coil 120 and miscellaneous part.This housing 170 also can be configured to be provided that any shape of receiving space except can being configured to rectangle.Additionally, this housing 170 can be made up of plastic material, this object resists external impact.
Printed circuit board (PCB) 180 is arranged in the lower section of bobbin 120 with to coil supply of electrical energy, and coil can be directly or indirectly attached to this printed circuit board (PCB) 180.Additionally, this printed circuit board (PCB) 180 can be provided with imageing sensor 181, the acceptable light having already passed through lens unit 110 with imaging of this imageing sensor.In this case, imageing sensor 181 can be supplied electric power by this printed circuit board (PCB) 180.
This printed circuit board (PCB) 180 may be coupled to the downside of housing 170, and when imageing sensor 181 is arranged on this printed circuit board (PCB) 180, the part of the lower surface of housing 170 open thus exposing this imageing sensor 181.
This radome 190 completely around this housing 170, bobbin 120 and keeper 140 thus avoiding electromagnetic interference (EMI).This radome 190 directly can couple cover this housing 170, bobbin 120 and keeper 140 simultaneously with printed circuit board (PCB) 180, and this radome can by iron and steel or be conducive to any material avoiding EMI to be configured to.
As described above, lens driver and there is the camera model of this lens driver only there are two magnets and therefore can save manufacturing cost according to an embodiment of the invention.In addition, although reducing the quantity of magnet, but by regulating the coefficient of elasticity of the first elastic component and the second elastic component and affect the lens unit of driving force of lens unit and the weight of bobbin, the maintenance characteristic identical with traditional lens driver and performance.
Although being described above only certain embodiments of the present invention, it is to be understood that, for those skilled in the art, when without departing from the technology intention of the present invention defined by the appended claims and scope, the present invention can be made multiple displacement and amendment.It will also be appreciated that a lot of other embodiments outside above-mentioned described embodiment are also contained in the claim of the present invention.
Accompanying drawing labelling
100: camera model
110: lens unit
120: bobbin
122: coil
124: jut
130: two magnets
140: keeper
141: opening
143: side panel
144: lateral opening
145: stopper slot
150: the first elastic components
160: the second elastic components
170: housing
180: printed circuit board (PCB)
181: imageing sensor
190: radome
Claims (10)
1. a lens driver, described lens driver includes:
Bobbin, accommodates in described bobbin and is respectively formed with coil on the outer surface faced by a pair of lens unit and described bobbin；
Two magnets, described magnet is arranged in the outside of described bobbin thus towards described coil, and described magnet is configured to form magnetic field；
Keeper, the upper surface of described keeper is formed with opening thus exposing described lens unit, and described keeper is coupled to the upside of described bobbin thus being fixed on the side of described bobbin by described magnet；And
First elastic component and the second elastic component, described first elastic component and described second elastic component are arranged in above and below described keeper, in order to support the upper side and lower side of described bobbin,
Wherein, when power is supplied to the coil, described coil produces the driving force formed by the interaction of described coil and described magnet, thus driving described lens unit and described bobbin,
Wherein, described first elastic component and described second elastic component are formed to have the coefficient of elasticity of 50mN/mm or less, and
Wherein, for unitary current 1mA, the drive displacement value of described lens unit and described bobbin is 3 μm/mA or bigger and 8 μm/mA or less.
2. lens driver according to claim 1, wherein, the number of turns that described coil is wound around 100 circles or more and 125 circles or less between, thus increasing the effective length of described coil being arranged in the magnetic field formed by described magnet.
3. lens driver according to claim 1 and 2, wherein, described magnet is all formed as the thickness with 0.5mm or bigger, increases in this way by the intensity in each magnetic field formed in described magnet, and
Wherein, in described coil one and spacing between in described magnet are 0.1mm or less, increase the magnetic density affecting described coil in this way.
4. lens driver according to claim 1, wherein, described first elastic component is formed with the thickness of 0.04mm or less, and described second elastic component is formed with the thickness of 0.03mm or less, by this way, described coefficient of elasticity is regulated by reducing the hardness of each in described first elastic component and described second elastic component.
5. lens driver according to claim 1, wherein, being formed with side panel on described keeper, described side panel covers the outer surface except the outer surface towards described magnet of described bobbin, strengthens the structural rigidity of described keeper in this way.
6. lens driver according to claim 1, wherein, the upper surface of described bobbin is formed with multiple jut, and
Wherein, the upper surface of described keeper being formed with multiple stopper slot, in this way, described jut is inserted and fixed to described stopper slot.
7. lens driver according to claim 1, also includes:
Housing, described housing is arranged in the lower section of described bobbin, for coupling with described keeper；And
Printed circuit board (PCB), described printed circuit board arrangement is in the lower section of described bobbin, for described coil is supplied electric power.
8. a camera model, described camera model includes:
Lens unit, is provided with lens drum and at least one lens in described lens unit；
Bobbin, described lens unit is housed and is respectively formed with coil on the outer surface within it and faced by a pair of described bobbin by described bobbin；
Two magnets, described magnet is arranged in the outside of described bobbin thus towards described coil, and described magnet is configured to form magnetic field；
Keeper, the upper surface of described keeper is formed with opening thus exposing described lens unit, and described keeper is coupled to the upside of described bobbin to be fixed on the side of described bobbin by described magnet；And
First elastic component and the second elastic component, described first elastic component and described second elastic component are arranged in above and below described keeper, in order to support the upper side and lower side of described bobbin,
Wherein, when power is supplied to the coil, described coil produces the driving force formed by the interaction of described coil and described magnet, thus driving described lens unit and described bobbin,
Wherein, described lens drum is formed as the weight with 80mg or less, in order to limit the change of described driving force according to the action of described lens unit and described bobbin；And
Wherein, it is configured to 0.1m or bigger with the corresponding focal length that drives of described lens unit and described bobbin.
9. camera model according to claim 8, wherein, described first elastic component and described second elastic component are formed to have the coefficient of elasticity of 50mN/mm or less, and
Wherein, for unitary current 1mA, the drive displacement value of described lens unit and described bobbin is 3 μm/mA or bigger and 8 μm/mA or less.
10. camera model according to claim 8 or claim 9, wherein, described first elastic component is formed with the thickness of 0.04mm or less, and described second elastic component is formed with the thickness of 0.03mm or less, by this way, coefficient of elasticity is regulated by reducing the hardness of each in described first elastic component and described second elastic component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410795644.4A CN105759391A (en) | 2014-12-18 | 2014-12-18 | Lens driving device and camera module provided with lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410795644.4A CN105759391A (en) | 2014-12-18 | 2014-12-18 | Lens driving device and camera module provided with lens driving device |
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| Publication Number | Publication Date |
|---|---|
| CN105759391A true CN105759391A (en) | 2016-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410795644.4A Pending CN105759391A (en) | 2014-12-18 | 2014-12-18 | Lens driving device and camera module provided with lens driving device |
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| CN (1) | CN105759391A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768503A (en) * | 2019-11-08 | 2020-02-07 | 绵阳安和光电科技有限公司 | XYZ three-direction vibration motor |
| KR20200075744A (en) | 2018-12-17 | 2020-06-26 | 뉴 시코 모터 컴퍼니 리미티드 | Lens driving device, camera device and electronic apparatus |
| KR20200101293A (en) | 2019-02-18 | 2020-08-27 | 뉴 시코 모터 컴퍼니 리미티드 | Aperture switching device, camera device and electronic apparatus |
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| US20080259470A1 (en) * | 2007-04-19 | 2008-10-23 | Chung Huang Tien | Voice coil type lens drive assembly |
| CN101542348A (en) * | 2008-10-14 | 2009-09-23 | 香港应用科技研究院有限公司 | Multi-actuator lens actuating device |
| KR20120065492A (en) * | 2010-12-13 | 2012-06-21 | 엘지이노텍 주식회사 | Voice coil motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080259470A1 (en) * | 2007-04-19 | 2008-10-23 | Chung Huang Tien | Voice coil type lens drive assembly |
| CN101542348A (en) * | 2008-10-14 | 2009-09-23 | 香港应用科技研究院有限公司 | Multi-actuator lens actuating device |
| KR20120065492A (en) * | 2010-12-13 | 2012-06-21 | 엘지이노텍 주식회사 | Voice coil motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200075744A (en) | 2018-12-17 | 2020-06-26 | 뉴 시코 모터 컴퍼니 리미티드 | Lens driving device, camera device and electronic apparatus |
| US11448851B2 (en) | 2018-12-17 | 2022-09-20 | New Shicoh Motor Co., Ltd. | Lens driving device, camera device and electronic apparatus |
| KR20200101293A (en) | 2019-02-18 | 2020-08-27 | 뉴 시코 모터 컴퍼니 리미티드 | Aperture switching device, camera device and electronic apparatus |
| CN110768503A (en) * | 2019-11-08 | 2020-02-07 | 绵阳安和光电科技有限公司 | XYZ three-direction vibration motor |
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Application publication date: 20160713 |