WO2018086407A1 - 一种透镜驱动装置 - Google Patents

一种透镜驱动装置 Download PDF

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Publication number
WO2018086407A1
WO2018086407A1 PCT/CN2017/101339 CN2017101339W WO2018086407A1 WO 2018086407 A1 WO2018086407 A1 WO 2018086407A1 CN 2017101339 W CN2017101339 W CN 2017101339W WO 2018086407 A1 WO2018086407 A1 WO 2018086407A1
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WIPO (PCT)
Prior art keywords
magnet
driving
lens
hall
driving device
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Ceased
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PCT/CN2017/101339
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English (en)
French (fr)
Inventor
王建华
龚高峰
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Shanghai BL Electronics Co Ltd
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Shanghai BL Electronics Co Ltd
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Publication date
Application filed by Shanghai BL Electronics Co Ltd filed Critical Shanghai BL Electronics Co Ltd
Priority to US16/092,219 priority Critical patent/US11016262B2/en
Priority to ES17870348T priority patent/ES2960836T3/es
Priority to EP17870348.4A priority patent/EP3438720B1/en
Publication of WO2018086407A1 publication Critical patent/WO2018086407A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the present invention relates to a driving device, and more particularly to a lens driving device.
  • CN103869443A discloses a lens driving device comprising a magnet, wherein the magnet is disposed at a certain gap position vacated at a position corresponding to each corner of the four-corner shape of the lens driving device;
  • CN101738704A discloses a lens driving device, including a magnet, which is provided as a trapezoidal magnet with a bottom edge of the arc and two asymmetric bevels, and the trapezoidal magnet is disposed at four corners of the inner cavity;
  • CN101206295A discloses a lens driving device with a magnet, including a magnet disposed in the yoke ring, the geometry of the magnet is set to a triangular prism shape, the magnet is set to four, the inner cavity of the yoke ring is set as a square cavity, and the four magnets are respectively disposed on the square shape of the yoke ring
  • the structure of the lens driving device of the above technical solution has limitations, which makes the reduction of the effective working length (area) of the driving magnet in the case of miniaturization of the existing driving device, which inevitably causes a small driving force. Defects such as poor travel, further, will cause the lens support to move the lens to the desired target position, ultimately affecting the imaging effect.
  • the purpose of miniaturization has the beneficial effects of low power consumption and large driving force relative to the prior art.
  • a lens driving device includes a shield cover, an outer cover of the inner periphery of the shield cover is provided with an upper cover and a driving magnet, and a lens support body is further disposed inside the shield cover, and a peripheral circumference of the lens support body is provided with a driving a coil; wherein the driving magnet comprises a first driving magnet and a second driving magnet, the structures of which comprise an angular section along the corner portion of the shielding cover and a side section along the side of the shielding cover, and The first drive magnet and the second drive magnet are centrally symmetric with respect to an axis of the lens driving device.
  • the new structure of the above-described driving magnet enables the driving force of the existing lens driving device to be greatly improved.
  • the structure of the driving magnet according to the present invention is greatly different from the prior art.
  • the development of the existing magnet manufacturing industry can support the structure and shape.
  • the transformation, rather than being limited by it, could not better design the drive magnet as an integrated flanged form; on the other hand, such a design also reduces the use of the drive magnet and its use to some extent.
  • the weight reduces the weight of the overall structure of the lens driving device.
  • the invention further includes a Hall detecting component including a Hall spacer and a Hall magnet disposed on the lens support, and a PCB component including a PCB disposed at one side of the shield cover And a Hall chip, a capacitor, a pin, and an internal line disposed on the PCB; wherein a side of the shield is not included at a side of the shield, and the edge portion of the driving magnet is not included
  • the Hall chip is disposed corresponding to the Hall magnet and is located at a portion away from the first driving magnet and the second driving magnet.
  • the Hall detecting component is a device added according to the user's use requirement, and the main working part, that is, a portion where the Hall chip is corresponding to the Hall magnet, is located away from the first driving magnet and the second.
  • the position of the driving magnet due to the improvement of the shape and position of the new driving magnet, in order not to affect the effect of the Hall detection, the existing positional relationship needs to be further adjusted, located at the end of the corner segment and the second driving away from the first driving magnet.
  • the center position at the end of the edge is equal, or the center position at the end of the edge of the first drive magnet and the end of the corner of the second drive magnet.
  • an inner spacer is further disposed inside the shielding cover, and an upper spring and a lower spring are respectively disposed above and below the lens support body, and a bottom of the lower spring is further provided with a supporting base.
  • the lens support body is an octagonal structure with four corners cut away, including four straight sides and four corners
  • the driving coil is wound around the periphery of the lens support in an octagonal shape, and the first driving magnet and the second driving magnet respectively correspond to adjacent one corner and the straight side to be parallel to the positional relationship of the driving coil. Symmetrically distributed in the center. That is, the driving magnet and the driving coils correspond to each other in parallel, and the pitches in the parallel segments coincide with each other.
  • first driving magnet and the second driving magnet are exactly the same, 180° opposite to each other, and the thickness of the corner segment and the edge portion of each driving magnet are equal.
  • a hole is formed on a side of the upper cover corresponding to the PCB board, and the hole is used for embedding a convex Hall chip on the PCB board, and further The Hall chip is accurately aligned with the Hall magnet mounted on the lens support; preferably, the hole is disposed at a position intermediate the first drive magnet and the second drive magnet to avoid The effect of driving a magnet on its normal operation.
  • a lens driving device includes: a shielding cover, an upper gasket, an upper cover, an upper spring, and two driving magnets on the inner side wall of the shielding cover; and a lens supporting body supporting the lens and wound around the lens supporting body a driving coil of the circumference and a Hall spacer and a Hall magnet on the lens support; further comprising a PCB board, a Hall chip, a capacitor, four pins and an internal connection line, wherein the PCB board and the Hall chip The capacitor, the four pins and the internal connection line, the Hall spacer and the Hall magnet form a lens position detection mechanism, and the Hall magnet and the Hall chip are spatially spaced apart from each other; and the lower spring is also included,
  • the upper spring supports the lens support body up and down together; and further includes a base, a bearing member, and particularly a member supporting the lens support.
  • the lens position detecting mechanism ie, the Hall detecting component
  • a certain amount of current command is applied to the driving coil, and the lens support starts to drive to the target position.
  • the resultant force of the biasing force of the upper and lower springs in the front-rear direction is balanced with the electromagnetic force generated by the drive coil and the drive magnet.
  • the outer peripheral end of the lens support has an octagonal shape, and an inner peripheral shape of the drive coil coincides with an outer circumference of the lens support.
  • the invention is characterized in that, by utilizing the space structure allowed by the conventional lens driving device, the two driving magnets are integrally bent and processed along the inner peripheral side wall portion of the shielding cover, and the driving magnet is from one inside the shielding cover.
  • the side processing is extended to the adjacent diagonal portion.
  • the effective length (area) of the driving magnet and the driving coil is increased, that is, under the action of the same current, due to the increase of the effective coverage of the magnetic field, the magnetic force generated by the driving coil after being energized corresponds to Lifting, thereby achieving a larger driving force.
  • the lens driving device according to the present invention is a lens driving device capable of satisfying small size, low power consumption, and large driving force.
  • FIG. 1 is a front perspective view of a related lens driving device according to an embodiment of the present invention.
  • FIG. 2 is a schematic perspective view showing the back side of the related lens driving device in the embodiment of the present invention.
  • FIG. 3 is a schematic view showing the positional configuration of a lens support and a Hall magnet in an embodiment of the present invention
  • FIG. 4 is a top plan view showing a positional relationship between a Hall detecting component and related components in an embodiment of the present invention
  • Figure 5 is a side view showing the positional relationship between the Hall detecting component and related components in the embodiment of the present invention.
  • FIG. 6 is a schematic exploded view showing the structure of a lens driving device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural view of a PCB component in an embodiment of the present invention.
  • FIG. 8 is a schematic view showing a positional relationship between a Hall chip and a driving magnet after being fitted into a hole of the upper cover in the embodiment of the present invention
  • Figure 9 is a perspective view showing the three-dimensional structure of the lower spring in the embodiment of the present invention.
  • Figure 10 is a schematic perspective view showing the structure of the base in the embodiment of the present invention.
  • Figure 11 is a schematic view showing the positional relationship and shape of two opposing driving magnets in the embodiment of the present invention.
  • the present invention provides a lens driving device including a shield cover 01.
  • the outer periphery of the shield cover 01 is provided with an upper cover 05 and a drive magnet 08, and the inside of the shield cover 01 is further provided with a lens support body 06.
  • the outer circumference of the lens support body 06 is wound with a drive coil 07; wherein the drive magnet 08 includes a first drive magnet and a second drive magnet, the structures of which each include an angular section 082 along the corner portion of the shield cover 01. And a side section 081 along the side of the shield cover 01, and the first drive magnet and the second drive magnet are center-symmetric with respect to the axis of the lens driving device.
  • a Hall detecting component 09 is further included, including a Hall spacer 092 and a Hall magnet 091 disposed on the lens support, and a PCB component 093, the PCB component 093 including the shielding cover 01 a PCB board 0932 at one side and a Hall chip 0934, a capacitor 0931, a pin 0933, and an internal line provided on the PCB board 0932; wherein the shielding cover does not include the mounting at one side
  • the edge position of the magnet side section 081 is driven, and the Hall chip 0934 is disposed corresponding to the Hall magnet 091 and located at a position away from the first driving magnet and the second driving magnet.
  • the two driving magnets 08 are respectively integrated and crimped, and the driving magnet 08 is shielded from the shielding cover.
  • One inner side of 01 is bent to abutting the opposite corner.
  • the length (area) of the driving magnet 07 and the driving coil 07 is increased, that is, under the action of the same current, the magnetic force generated by the driving coil is increased correspondingly due to the increase of the effective coverage of the magnetic field. Thereby, a large driving force can be achieved.
  • the shield case 01 is a non-magnetic, soft stainless steel material that is planarly viewed as having a four-sided four-sided housing shape with grounded anti-static and electromagnetic shielding during external attachment.
  • a drive magnet 08 with an integrated flange is disposed on each of the two opposite sides.
  • the upper spacer 02 is mounted between the shield cover 01 and the upper spring 03 in a square plate-like structure, and has the same material as the spring and has the same hardness. After the upper gasket 02 is fitted into the shield cover 01, the planar flatness of the spring after assembly is ensured.
  • the upper spring 03 has a plate-like leaf spring structure between the shield cover 01 and the upper cover 05, the outer ring is mounted on the upper cover surface, and the inner ring is fitted to the top end surface of the lens support body 06. Bonding is fixed.
  • the lens support body 06 has a cylindrical shape in the optical axis diameter direction, and the upper end surface and the lower end surface thereof are supported and supported by the upper spring 03 and the lower spring 04, respectively.
  • a lens is disposed on the inner peripheral side, and a drive coil 07 is disposed on the outer peripheral side.
  • the outer peripheral end of the lens support body 06 is octagonal, and the outer peripheral shape of the drive coil 07 coincides with the outer circumference of the lens support body 06.
  • the lens support body 06 is respectively provided with a notch portion 061 at the upper four corners of the outer circumference thereof, and the notch portion is non-contactly fitted with each of the flanges 011 on the inner side of the shield cover 01, and the lens support body 06 is driven in the circumferential direction.
  • the X, Y axis or optical axis has good anti-biasing and torsion resistance in the Z-axis direction.
  • the upper corner portion of the lens support body 06 is further provided with an opening notch portion which is vertically received into the Hall spacer 092 and the Hall magnet 091 in order from the inside to the outside.
  • the inner back gasket disposed on the Hall magnet 091 is made of stainless steel and high magnetic material, and has the function of resisting magnetic leakage, effectively protecting and enhancing the magnetic flux intensity of the Hall magnet, and assembling the Hall magnet 091 more easily.
  • the Hall magnet 091 is mounted to the open notch portion of the lens support body 06.
  • the maximum avoidance between the arrangement position of the integrated flange drive magnet 08 and the Hall magnet 091 avoids the mutual interference of the magnetic fields and maximizes the prevention in the space interval.
  • the upper cover 05 has a frame structure, and the upper cover 05 is disposed inside the shield cover 01 .
  • the PCB component 093 is composed of a PCB board 0932, a Hall chip 0934, a capacitor 0931, 4 pins 0933, and internal connection lines.
  • the upper cover 05 is provided with a hollow port (ie, a hole) 051 on the right side of the foot, and a Hall chip 0934 protruding from the PCB board 0932 is fitted into the upper cover.
  • the hollow port 051 of the cover is firmly fixed thereto, and the position of the Hall chip 0934 is accurately aligned with the Hall magnet 091 disposed on the lens support body 06 in a spatial position.
  • the lower spring 04 is in the form of a planar leaf spring.
  • the four corner portions have a plurality of outer peripheral side through holes 042 and a plurality of inner peripheral side through holes 043.
  • the outer peripheral side through hole 042 is fitted into the boss portion 101 on the base 10 and fixed to the base 10; the inner peripheral side portion of the spring is mounted on the lower end surface of the lens support body 06, and the plurality of inner peripheral side through holes 043 are Dispensing, the inner peripheral side spring is firmly fixed to the lower end surface of the carrier.
  • the two sides of the lower side of the lower spring have two end legs 041, and are assembled to be electrically connected to the two pins 0933 on the PCB board 0932.
  • the base 10 is used as a bearing moving member, and a dustproof ring 102 having a certain height is provided along the peripheral wall side of the inner cavity, and the lower end of the lens support body 06 is With the combination, it can be dust-proof.
  • the base 10 is embedded in the shield cover 01.
  • the internal electrical connection manner is: the beginning and the end lines of the driving coil wound around the outer circumference of the lens support body 06 are respectively welded to two different parts of the surface of the lower spring, and the two end legs of the lower spring are respectively connected with the PCB line The two pins 0933 of the board are electrically connected.
  • the Hall effect of the Hall chip in the PCB board interacts with the Hall magnet to form a control means for detecting the feedback of the lens position, and constitutes a closed-loop camera drive.
  • the lens in the lens support body is more accurately displaced each time, reducing the number of times the lens moves back and forth, and has the effect of fast and precise focusing.
  • the driving magnet processed by the integrated crimping is divided into two sections, and one long side magnet section of the shield is set as a side magnet, and the magnet section adjacent to the corner position of the shield is provided. It is a corner magnet.
  • the magnets of the side magnets and the corner magnets have the same wall thickness, and the magnets at the edge and the magnets at the corners form an R angle. If the edge magnet is a side coil opposite to the driving coil, the corner magnet is opposite to the driving coil side, and the corner coil and the corner coil are also connected by an R angle.
  • the inner side of the magnet is N pole, and the outer side of the magnet is S pole.
  • the side magnets located on the inner side and the corner magnets disposed at the adjacent corners act as driving.
  • the relative effective length (area) between the driving coil and the driving magnet in the present invention is large compared to the case where there is no edge magnet or no corner magnet, so the entire magnetic flux orthogonal to the driving coil is obtained. It is bigger. For this reason, a stronger driving force can be obtained at a certain current.
  • the corner magnet is disposed at the opposite spatial position of the adjacent corner portion, no special space is required. As the driving force is increased, it is possible to further reduce the size of the lens driving device.
  • edge magnets and the corner magnets here are only for convenience of explanation, and are divided into two parts, which are actually two different sections of the integrated curved machining magnet. Integrated processing has more advantages than separate processing into two parts. Because it is integrated, the number of parts is reduced, making assembly easier and less labor-saving.
  • the shape of the flange of the driving magnet is consistent with the shape of the flange of the adjacent sides of the driving coil, and the driving magnet is assembled and opposed to the driving coil.
  • the driving magnet and the opposite driving coils are parallel to each other, and the distances between the two parallel segments are identical.
  • the two driving magnets located in the shielding cover have the same shape and thickness, and are arranged 180 degrees opposite to each other.
  • the lens support and the coil shape do not have to be octagonal.
  • the driving magnet can be made into a component type according to the design structure of the lens driving device.
  • the curved shape of the driving magnet can be bent into a right angle, a circular arc shape, or a polygonal line shape depending on the shape of the shield cover and the driving coil.

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Abstract

一种透镜驱动装置，包括屏蔽罩（01），屏蔽罩（01）的内部的外周设有上盖（05）和驱动磁石（08），屏蔽罩（01）的内部还设有透镜支撑体（06），透镜支撑体（06）的外周绕设有驱动线圈（07）；其中，驱动磁石（08）包括第一驱动磁石和第二驱动磁石，其结构均包括沿着屏蔽罩（01）角部分布的角段（082）和沿着屏蔽罩（01）边部分布的边段（081），且第一驱动磁石和第二驱动磁石以透镜驱动装置的轴心呈中心对称。通过对透镜驱动装置结构的改进，尤其是对其驱动磁石的结构以及安装位置的改进，并进一步地改进其它相关部件，使最终得到的透镜驱动装置可以实现更小化的目的，并相对于现有技术具有低耗电、大驱动力的有益效果。

Description

一种透镜驱动装置 技术领域
本发明涉及一种驱动装置，尤其涉及一种透镜驱动装置。
背景技术
在现有的透镜驱动装置中，为了将装置小型化，往往把驱动用的磁石配置在透镜驱动装置的角部。例如CN103869443A公开了一种透镜驱动装置，包括磁石，其中，所述磁石配置在透镜驱动装置的四角形状的各角部所对应位置空出的一定间隙位置；CN101738704A公开了一种透镜驱动装置，包括磁石，其设置为带有圆弧底边及两个非对称斜边的梯形磁石，且所述梯形磁石设置在内腔的四个角部；CN101206295A公开了一种带磁石的透镜驱动装置，包括安置在磁轭环中的磁石，该磁石的几何形状设置为三角棱形，磁石设置为四个，磁轭环内腔设置为方型内腔，四个磁石分别安置在磁轭环的方型内腔的四个角部；JP特开2007-139810也公开记载有这样的透镜驱动装置。
上述的技术方案在用于小型透镜驱动装置中是合理的，但是如果进一步地推行更小型化的话，这种角部磁石的设置方式由于不能提供足够的驱动力，已经远远不能支持驱动装置的正常工作。为了实现更小型化的目的，必要的情况下，需要把绕卷在透镜支撑体外周侧的驱动用线圈和环口的外周侧壁接近配置，这样在环口的外周侧壁的边部的长距离上就更加没有多余空间用于配置驱动磁石了。如此，驱动用磁石和驱动用线圈相对向的长度(面积)就进一步地变小，驱动力更加不可能充足。
事实上，上述技术方案的透镜驱动装置的结构是存在局限性的，这使得现有的驱动装置在实现小型化的情况下，驱动磁石有效作用长度(面积)的减小势必会引起驱动力小、行程不良等缺陷，进一步地，将会导致透镜支撑体无法将镜头移动至理想的目标停留位置，最终影响成像的效果。
可见，在现有技术的基础上，在进一步地将装置小型化的课题下还存在诸多困难。如何实现透镜驱动装置的小型化、低耗电且能得到较大的驱动力的目的是本领域技术人员所要急迫解决的课题。
发明内容
本发明的目的是提供一种透镜驱动装置，通过对其结构的改进，尤其是对其驱动磁石的结构以及安装位置的改进，并进一步地改进其它相关部件，使最终得到的透镜驱动装置可以实现更小化的目的，并相对于现有技术具有低耗电、大驱动力的有益效果。
为了实现上述目的，本发明的技术方案是：
一种透镜驱动装置，包括屏蔽罩，所述屏蔽罩的内部的外周设有上盖和驱动磁石，所述屏蔽罩的内部还设有透镜支撑体，所述透镜支撑体的外周绕设有驱动线圈；其中，所述驱动磁石包括第一驱动磁石和第二驱动磁石，其结构均包括沿着所述屏蔽罩角部分布的角段和沿着所述屏蔽罩边部分布的边段，且所述第一驱动磁石和第二驱动磁石以所述透镜驱动装置的轴心呈中心对称。
具体地，上述驱动磁石的新结构设置，能够使现有的透镜驱动装置的驱动力得以大大提升。需要说明的是，随着驱动磁石制造业的发展，本发明所述的驱动磁石的结构与现有技术的相差很大，一方面是现有磁石制造行业的发展得以支持这一结构、形状上的改造，而不像之前那样会受其局限而不能更好地将驱动磁石设计为一体化弯边形式；另一方面这样的设计也在一定程度上减小了驱动磁石的用料以及其使用重量，减小了透镜驱动装置整体结构的重量。
进一步地，还包括霍尔检测组件，包括设于所述透镜支撑体上的霍尔垫片和霍尔磁石，以及PCB部件，所述PCB部件包括设于所述屏蔽罩一侧边处的PCB板以及设于所述PCB板上的霍尔芯片、电容、引脚以及内部线路；其中，所述屏蔽罩一侧边处不包括所述装设有驱动磁石边段的边部位置，所述霍尔芯片与所述霍尔磁石对应设置且其位置位于远离所述第一驱动磁石和第二驱动磁石的部位。
具体地，霍尔检测组件是按照用户的使用要求的提高而加设的装置，其主要作用部位，即霍尔芯片与所述霍尔磁石对应设置的部位，位于远离第一驱动磁石和第二驱动磁石的部位，由于新驱动磁石的形状以及位置的改进，为了不影响霍尔检测的效果，其现有的位置关系需要进一步地调整，位于远离第一驱动磁石的角段末端和第二驱动磁石的边段末端的位置，或者是远离第一驱动磁石的边段末端和第二驱动磁石的角段末端的位置，最优选为位于到第一驱动磁石的角段末端和第二驱动磁石的边段末端的距离相等的中心位置，或者是到第一驱动磁石的边段末端和到第二驱动磁石的角段末端的距离相等的中心位置。
进一步地，所述屏蔽罩内部还设有上垫片，所述透镜支撑体的上方和下方各设有上弹簧和下弹簧，所述下弹簧的底部还设有起支撑作用的底座。
进一步地，所述透镜支撑体为切去四个角部的类八边结构，包括四个直边和四个角 边，所述驱动线圈以类八边形缠绕在透镜支撑体周边，所述第一驱动磁石和第二驱动磁石分别对应于相邻的一角边和一直边以平行于所述驱动线圈的位置关系成中心对称分布。即所述驱动磁石与所述驱动线圈相互平行对应，平行段内的间距互相一致。
进一步地，所述第一驱动磁石和第二驱动磁石的形状、大小完全相同，互为180°对向分布，且每一驱动磁石的角段和边段的厚度相等。
进一步地，所述透镜驱动装置中，所述上盖上与所述PCB板对应的一侧边上设有一孔洞，所述孔洞用于PCB板上的凸起的霍尔芯片的嵌入，进一步地，所述霍尔芯片与装设在透镜支撑体上的霍尔磁石精确对向；优选地，所述孔洞的位置设于距离所述第一驱动磁石和第二驱动磁石的中间位置，以避免驱动磁石对其正常工作的影响。
进一步地，一种透镜驱动装置，包括：屏蔽罩、上垫片、上盖、上弹簧及位于屏蔽罩内侧壁的二个驱动磁石；还包括支撑透镜的透镜支撑体、卷绕于透镜支撑体外周的驱动线圈及位于透镜支撑体上的霍尔垫片和霍尔磁石；还包括PCB板、霍尔芯片、电容、4个引脚及内部连接线路，其中，所述PCB板、霍尔芯片、电容、4个引脚和内部连接线路与霍尔垫片和霍尔磁石构成了镜头位置检测机制，霍尔磁石与霍尔芯片在空间上互为间隔对向配置；还包括下弹簧，与所述上弹簧一起上下支撑住透镜支撑体；还包括底座，承载部件，尤其是支撑透镜支撑体等部件。
根据镜头位置检测机制(即霍尔检测组件)所反馈的移动目标位置，给驱动线圈通以一定量的电流指令，透镜支撑体开始向目标位置驱动。在驱动停止位置，上弹簧和下弹簧的前后方向的施力的合力与驱动线圈和驱动磁石产生的电磁力保持相平衡状态。所述透镜支撑体的外周端为八边形，驱动线圈内外周形状与所述透镜支撑体的外周相一致。
本发明的特征为：利用现有透镜驱动装置允许的空间结构，顺着屏蔽罩内周侧壁部，将二个驱动用磁石分别加以一体化弯边加工，驱动用磁石从屏蔽罩的一个内边侧加工延长至邻接对角部。这样，也就增加了驱动用磁石和驱动用线圈相对向的有效长度(面积)，即在相同电流的作用下，由于磁场有效覆盖面增加，驱动用线圈通电后与之相作用所产生的磁力相应提升，由此可实现较大的驱动力。本发明所述的透镜驱动装置是一种能够满足小型、低耗电、大驱动力的透镜驱动装置。
附图说明
图1是本发明实施例中相关透镜驱动装置的正面立体结构示意图；
图2是本发明实施例中相关透镜驱动装置的背面立体结构示意图；
图3是本发明实施例中透镜支撑体与霍尔磁石的位置构造示意图；
图4是本发明实施例中霍尔检测组件与相关部件的位置关系俯视图；
图5是本发明实施例中霍尔检测组件与相关部件的位置关系侧视图；
图6是本发明实施例中透镜驱动装置的结构分解示意图；
图7是本发明实施例中PCB部件的构造示意图；
图8是本发明实施例中霍尔芯片配嵌进上盖的孔洞后与驱动磁石的位置关系示意图；
图9是本发明实施例中下弹簧立体构造示意图；
图10是本发明实施例中底座立体构造示意图；
图11是本发明实施例中两对向驱动磁石的位置关系及形状示意图。
附图标记：
01-屏蔽罩
011-翻边
02-上垫片
03-上弹簧
04-下弹簧
041-下弹簧端脚
042-外周侧贯通孔
043-内周侧贯通孔
05-上盖
051-孔洞
06-透镜支撑体
061-缺口部
07-驱动线圈
08-驱动磁石
081-驱动磁石的边段
082-驱动磁石的角段
09-霍尔检测组件
091-霍尔磁石
092-霍尔垫片
093-PCB部件
0931-电容
0932-PCB板
0933-PCB引脚
0934-霍尔芯片
10-底座
101-凸起部
102-防尘环。
具体实施方式
下面结合附图和具体的实施例对本发明作进一步的说明，但是不作为本发明的限定。
本发明提供了一种透镜驱动装置，包括屏蔽罩01，所述屏蔽罩01的内部的外周设有上盖05和驱动磁石08，所述屏蔽罩01的内部还设有透镜支撑体06，所述透镜支撑体06的外周绕设有驱动线圈07；其中，所述驱动磁石08包括第一驱动磁石和第二驱动磁石，其结构均包括沿着所述屏蔽罩01角部分布的角段082和沿着所述屏蔽罩01边部分布的边段081，且所述第一驱动磁石和第二驱动磁石以所述透镜驱动装置的轴心呈中心对称。
进一步地，还包括霍尔检测组件09，包括设于所述透镜支撑体上的霍尔垫片092和霍尔磁石091，以及PCB部件093，所述PCB部件093包括设于所述屏蔽罩01一侧边处的PCB板0932以及设于所述PCB板0932上的霍尔芯片0934、电容0931、引脚0933以及内部线路；其中，所述屏蔽罩一侧边处不包括所述装设有驱动磁石边段081的边部位置，所述霍尔芯片0934与所述霍尔磁石091对应设置且其位置位于远离所述第一驱动磁石和第二驱动磁石的部位。
如图1-2所示，利用现有透镜驱动装置允许的空间结构，顺着屏蔽罩01内周侧壁部，二个驱动磁石08分别加以一体化弯边加工，将驱动磁石08从屏蔽罩01的一个内边侧弯延至邻接对角部。这样，也就增加了驱动磁石07和驱动线圈07相对向的长度(面积)，即在相同电流的作用下，由于磁场有效覆盖面增加，驱动用线圈通电后与之相作用所产生的磁力相应提升，由此可实现较大的驱动力。
在一个实施例中，屏蔽罩01是一种无磁性的软态不锈钢材，其平面看为拥有四个侧边的四角罩壳形状，在外部连接过程中有接地防静电和电磁屏蔽作用。在其中两个互为对向的侧部分别配置有一条一体化弯边的驱动磁石08。
在一个实施例中，上垫片02安装于屏蔽罩01和上弹簧03之间，呈方形板状结构，与弹簧为同一材质，硬度相同。上垫片02装进屏蔽罩01内后，保证了弹簧在组装后的平面平整性。
在一个实施例中，所述上弹簧03呈板状板簧结构，位于屏蔽罩01和上盖05之间，其外圈搭载于上盖面，内圈与透镜支撑体06的顶端面相嵌合粘接固定。
在一个具体实施例中，如图3所示，所述透镜支撑体06在光轴径方向呈筒状形，其上端面和下端面分别被上弹簧03和下弹簧04所支撑夹固。其内周侧配设镜头，外周侧配设驱动线圈07。所述透镜支撑体06的外周端为八边形，驱动线圈07内外周形状与所述透镜支撑体06的外周相一致。所述透镜支撑体06在其外周的上侧四角部分别设有一缺口部061，该缺口部与屏蔽罩01内侧的各翻边011非接触性配合，透镜支撑体06驱动时在周径方向的X、Y轴或光轴的Z轴方向上具有良好的防偏抗扭性能。所述透镜支撑体06的上侧角部另设有一开口凹口部，该开口凹口部从内至外依次竖直收纳进所述霍尔垫片092和所述霍尔磁石091。配置于所述霍尔磁石091的内侧背部垫片材质为不锈钢高磁材质，具有抗漏磁的作用，有效保护并提升霍尔磁石的磁通量强度，同时能更易平整地组装霍尔磁石091。
在一个具体实施例中，如图4-5所示，所述霍尔磁石091安装于透镜支撑体06的开口凹口部。一体化弯边驱动磁石08的配设位置与霍尔磁石091之间作了最大避位，避免磁场相互干扰，在空间间隔上作了最大的防范。
在一个具体实施例中，如图6所示，所述上盖05呈框型结构，所述上盖05配设于屏蔽罩01内侧。
在一个具体实施例中，如图7所示，所述PCB部件093由PCB板0932、霍尔芯片0934、电容0931、4个引脚0933及内部连接线路所构成。
在一个具体实施例中，如图8所示，所述上盖05其右边侧靠近脚部位置设有一镂空口(即孔洞)051，PCB板0932上凸设的霍尔芯片0934配嵌进上盖的镂空口051中后被牢牢固定于其上，且霍尔芯片0934位置与配设在透镜支撑体06上霍尔磁石091在空间位置上做到精准对向。
在一个具体实施例中，如图9所示，所述下弹簧04呈平面板簧结构。其四角边部具有多个外周侧贯通孔042和多个内周侧贯通孔043。外周侧贯通孔042与底座10上的凸起部101相套合，固定于底座10上；弹簧内周侧部搭载于透镜支撑体06的下端面，通过对多个内周侧贯通孔043进行点胶，内周侧弹簧牢牢接着固定于载体下端面上。下弹簧同侧部的两边部具有2个端脚041，装配后与PCB板0932上的两个引脚0933相接触成电气性连接。
在一个具体实施例中，如图10所示，所述底座10用作承载移动部件，沿内腔周壁侧设有一定高度凸起的防尘环102，与透镜支撑体06的下周端相配合，可起防尘的功效。所述底座10嵌配进屏蔽罩01内。
内部电气性连接方式为：卷绕于透镜支撑体06外周的驱动线圈的起末始两端线分别焊接于所在下弹簧表面的两个不同部位，所述下弹簧的两个端脚分别与PCB线路板的两个引脚0933作电气性结合连接。
通过PCB板中的霍尔芯片的霍尔效应与霍尔磁石相互作用，形成检测出镜头位置的反馈的控制手段，构成闭环式的摄像头驱动。促使透镜支撑体内的透镜每次移位更精准，减少透镜来回移动的次数，具有快速精准对焦的功效。
为便于说明，如图11所示，我们假设将一体弯边加工的驱动磁石分成2段，屏蔽罩的一个长边侧磁石段设为边段磁石，邻接屏蔽罩角部空间位置的磁石段设为角段磁石。边段磁石和角段磁石两磁石段磁石壁厚相同，边段磁石和角段磁石相连接部成R角。若边段磁石相对向驱动线圈边为边段线圈，则角段磁石对向驱动线圈边为角段线圈，边段线圈与角段线圈之间也是R角相连。磁石的内侧为N极，磁石的外侧为S极。
根据本发明，向线圈通上一定电流后，位于内边侧的边段磁石和配置于邻接角部的角段磁石都起驱动作用。很显然，比起没有边段磁石或没有角段磁石的场合，本发明中的驱动线圈与驱动磁石之间相对向的有效作用长度(面积)要来得大，所以和驱动线圈正交的整个磁通量就较大。正因如此，在一定电流下，可得到更强得驱动力。还有，角段磁石是设置在邻接角部的对向空间位置，所以无需特别的空间。由于驱动力提升，从而能够进一步使透镜驱动装置具备小型化的可能。
这里的边段磁石和角段磁石只是为了便于说明，分成了两个部分，实际上是一体化弯边加工磁石的两个不同段的部分。一体化加工要比单独分成两部分加工具有更多的优点，由于是一体化，部件点数减少，组装时更为简便省力。
具体优选地，所述驱动磁石的弯边形状与驱动线圈相邻两边的弯边外形保持一致，所述驱动磁石加工组装后与所述驱动线圈相互对向。所述透镜驱动装置中，所述驱动磁石与所对向的驱动线圈相互平行，两平行段内间距相一致。所述透镜驱动装置中，位于屏蔽罩内的所述二条驱动磁石形状大小厚薄相同，互为180度对向配置。
本发明不局限于上述实施形态，在不脱离本发明主旨的范围内可作种种变形。对于本发明所属技术领域的普通技术人员来说，在本发明主旨范围内所做出若干简单推演或替换，都应当视为本发明的保护范围。
例如：透镜支撑体、线圈形状不一定要做成八边形。驱动用磁石根据透镜驱动装置的设计结构，可以不必非要一体化，也可以做成分体式。根据屏蔽罩和驱动用线圈形状的不同，驱动用磁石的弯曲形状可以弯成直角形、圆弧形或者折线形。
以上对本发明的具体实施例进行了详细描述，但其只是作为范例，本发明并不限制于以上描述的具体实施例。对于本领域技术人员而言，任何对本发明进行的等同修改和替代也都在本发明的范畴之中。因此，在不脱离本发明的精神和范围下所作的均等变换和修改，都应涵盖在本发明的范围内。

Claims (10)

  1. 一种透镜驱动装置，其特征在于，包括屏蔽罩，所述屏蔽罩的内部的外周设有上盖和驱动磁石，所述屏蔽罩的内部还设有透镜支撑体，所述透镜支撑体的外周绕设有驱动线圈；其中，所述驱动磁石包括第一驱动磁石和第二驱动磁石，其结构均包括沿着所述屏蔽罩角部分布的角段和沿着所述屏蔽罩边部分布的边段，且所述第一驱动磁石和第二驱动磁石以所述透镜驱动装置的轴心呈中心对称。
  2. 根据权利要求1所述的透镜驱动装置，其特征在于，还包括霍尔检测组件，包括设于所述透镜支撑体上的霍尔垫片和霍尔磁石，以及PCB部件，所述PCB部件包括设于所述屏蔽罩一侧边处的PCB板以及设于所述PCB板上的霍尔芯片、电容、引脚以及内部线路；其中，所述屏蔽罩一侧边处不包括所述装设有驱动磁石边段的边部位置，所述霍尔芯片与所述霍尔磁石对应设置且其位置位于远离所述第一驱动磁石和第二驱动磁石的部位。
  3. 根据权利要求2所述的透镜驱动装置，其特征在于，所述霍尔芯片与所述霍尔磁石的位置位于到第一驱动磁石的角段末端和第二驱动磁石的边段末端的距离相等的中心位置，或者是到第一驱动磁石的边段末端和到第二驱动磁石的角段末端的距离相等的中心位置。
  4. 根据权利要求1所述的透镜驱动装置，其特征在于，所述屏蔽罩内部还设有上垫片，所述透镜支撑体的上方和下方各设有上弹簧和下弹簧，所述下弹簧的底部还设有起支撑作用的底座。
  5. 根据权利要求1所述的透镜驱动装置，其特征在于，所述透镜支撑体为切去四个角部的类八边结构，包括四个直边和四个角边，所述驱动线圈以类八边形缠绕在透镜支撑体周边，所述第一驱动磁石和第二驱动磁石分别对应于相邻的一角边和一直边以平行于所述驱动线圈的位置关系成中心对称分布。
  6. 根据权利要求1所述的透镜驱动装置，其特征在于，所述第一驱动磁石和第二驱动磁石的形状、大小完全相同，互为180°对向分布，且每一驱动磁石的角段和边段的厚度相等。
  7. 根据权利要求1所述的透镜驱动装置，其特征在于，所述上盖上与所述PCB板对应的一侧边上设有一孔洞，所述孔洞用于PCB板上的凸起的霍尔芯片的嵌入；所述霍尔芯片与装设在透镜支撑体上的霍尔磁石精确对向。
  8. 根据权利要求1所述的透镜驱动装置，其特征在于，屏蔽罩是一种无磁性的软态不 锈钢材，在外部连接过程中有接地防静电和电磁屏蔽作用。
  9. 根据权利要求1所述的透镜驱动装置，其特征在于，所述透镜支撑体在其外周的上侧四角部分别设有一缺口部，该缺口部与屏蔽罩内侧的各翻边非接触性配合。
  10. 根据权利要求1所述的透镜驱动装置，其特征在于，所述透镜支撑体的上侧角部设有一开口凹口部，该开口凹口部从内至外依次竖直收纳进所述霍尔垫片和所述霍尔磁石。
PCT/CN2017/101339 2016-11-11 2017-09-12 一种透镜驱动装置 Ceased WO2018086407A1 (zh)

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