WO2018058674A1 - 超薄移轴中置式光学防抖音圈马达 - Google Patents
超薄移轴中置式光学防抖音圈马达 Download PDFInfo
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- WO2018058674A1 WO2018058674A1 PCT/CN2016/101378 CN2016101378W WO2018058674A1 WO 2018058674 A1 WO2018058674 A1 WO 2018058674A1 CN 2016101378 W CN2016101378 W CN 2016101378W WO 2018058674 A1 WO2018058674 A1 WO 2018058674A1
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- voice coil
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Definitions
- the present invention relates to the field of voice coil motor technology, and more particularly to an improved structure of a shift-axis optical anti-shake voice coil motor for realizing autofocus in a micro image device.
- the conventional sunken lens tilting motor (for example, CN200810109066) requires a large power to overcome the spring preload to achieve an autofocus effect. Therefore, many companies have proposed a center-mounted optical anti-shake voice coil motor structure, which saves power required to overcome the preload of the spring, resulting in more power saving.
- the magnetic pole face height is limited in principle, and the magnetic pole face height is lower than the total motor height percentage.
- the total height of the motor is limited, the height of some magnets will inevitably become too low, affecting the linear zone of the focus stroke, ultimately limiting the motor's closest distance to focus and the accuracy of focus.
- center-mounted optical anti-shake voice coil motor has a complicated structure and many components, which is disadvantageous for production, low cost, and reduced height.
- the object of the present invention is to solve the following problems of the current shift-axis optical anti-vibration voice coil motor: [0007] 1.
- the power consumption is too large, affecting the endurance, and the generated heat has the opportunity to affect nearby components;
- the motor height is too high, not suitable for ultra-thin portable photography devices (eg smartphones);
- the technical solution adopted is: ultra-thin shifting axis center-mounted optical anti-shake voice coil motor
- the utility model comprises a base, a lens carrier and a casing.
- the utility model is characterized in that: the base is provided with three or more base bosses, and each of the base bosses is connected with the lens carrier by a group of elastic pieces; the outer casing is mounted on the base
- the upper side wall of the outer casing is provided with three or more groups of magnets, and the same side surface of each group of magnets includes an upper magnetic pole surface and a lower magnetic pole surface with different polarities and upper and lower sides;
- the outer side wall of the lens carrier is provided with each group of magnets Three or more sets of coils corresponding one by one are respectively connected, and the coil is electrically connected to the pin terminals on the base through the elastic piece.
- Each set of magnets comprises a single-sided bipolar magnet; or each set of magnets consists of two magnets, the magnetic poles of each magnet being opposite in direction.
- One of the base bosses is disposed between two adjacent sets of the magnets.
- the outer side wall of the lens carrier is provided with a coil boss at a position corresponding to the coil, and the coil is wound on the coil boss.
- the top of the lens carrier is provided with a limiting slot
- the top of the housing is provided with a limiting block that is turned inwardly into the limiting slot, and the limiting slot is matched with the limiting block.
- a fixed elastic piece for mechanical connection is further provided between the lens carrier and the base.
- Each set of shrapnel is composed of two pieces of bullets that realize two electrical paths.
- the magnet and the coil are respectively four sets of turns, the four sets of coils are distributed on the four outer sides of the lens carrier, and the opposite two sets of coils are connected in series to form one coil group.
- the beneficial effects of the present invention are as follows:
- the present invention can simultaneously support three-dimensional focusing, optical axis tilt compensation of auto focus, and optical anti-shake function. Since the present invention simplifies the structure of the motor and reduces the height of the motor, it can be applied to a micro image device. For example: Camera module in a mobile phone.
- the invention can effectively reduce the focusing power consumption, prolong the endurance of the image device, and reduce the influence of the motor heat on the components in the vicinity of the motor. . For example: When the motor emits excessive heat, it increases the temperature of the image sensor and the noise in the image.
- the present invention can make good use of the limited height space of the motor compared to the sunken or other center-mounted motor structure, maximize the height of each pole face of the magnet, increase the linear range of the motor stroke, and support super macro shooting.
- the motor of the present invention has a simple structure, can reduce the difficulty of production, and reduce production and material costs.
- FIG. 1 is a schematic perspective view of the present invention
- FIG. 3 is a schematic view showing the internal structure of the outer casing of the present invention.
- FIG. 4 is a cross-sectional view showing the structure of A-A in FIG. 1;
- FIG. 5 is a cross-sectional view showing the structure of B-B in FIG. 1.
- the ultra-thin shifting center-mounted optical anti-vibration voice coil motor of the present invention comprises a bottom portion 1, a lens carrier 2 and a casing 3.
- the base 1 is uniformly distributed with four base bosses 11 , and each of the base bosses 11 is connected to the outer side wall of the lens carrier 2 via a set of elastic pieces 4; the height of the outer side wall of the lens carrier 2 is passed through
- the connecting block 21 is connected to the elastic piece 4; each of the elastic pieces 4 comprises two pieces of bullets which realize two electrical paths, that is, four sets of the elastic pieces 4 can realize eight electrical paths.
- the outer casing 3 is mounted on the base 1, and a total of four sets of magnets 5 are disposed on the inner side wall of the outer casing 3 in four directions.
- Four coil bosses 22 are disposed on the outer sidewall of the body 2 corresponding to the four sets of magnets 5.
- Each coil boss 22 is wound with coils 6 corresponding to the four sets of magnets 5; the four sets of coils 6 can pass through a set of corresponding
- the elastic piece 4 is electrically connected to the pin terminal on the base 1.
- the opposite two sets of coils may be connected in series to form a coil group, and each coil group is electrically connected to the pin terminals on the base 1 by the bullet pieces constituting the two electrical paths, through the pin terminals and
- the external control circuit is connected.
- the external control circuit can independently change the magnetic force and torque of each group of coils by controlling the current direction and current flowing through each group of coils to achieve three-axis control.
- a base boss 11 is disposed between the two sets of magnets 5, that is, the magnet is not disposed above the base boss 11, and the base boss 11 is distributed at the four corners of the base 1.
- the same side surface of each group of magnets 5 includes an upper magnetic pole surface 51 and a lower magnetic pole surface 52 which are different in polarity from each other; the polarities of the two magnetic pole faces 51, 52 are opposite, so the coil The direction of the electromagnetic force is parallel to the optical axis, achieving the focus and lens shift-axis optical image stabilization function.
- each set of magnets can make good use of most of the height of the motor; because the height of the two magnetic pole faces is higher Therefore, the linear region of the focus stroke can be effectively improved, and the power consumption can be reduced.
- the ultra-thin motor in this embodiment is limited in height, it can still achieve good focusing function and super macro effect.
- the top of the lens carrier 2 is provided with a limiting slot 23, and the top of the housing 3 is provided with a limiting block 31 which is turned inwardly into the limiting slot 23.
- the limiting slot 23 is matched with the limiting block 31 to limit the movement of the lens carrier 2 within the effective range.
- a fixed elastic piece for mechanical connection, a fixed elastic piece and the lens carrier may be provided between the lens carrier 2 and the base 1 as needed.
- the housing or base is mechanically connected, but it is not intended for use as a source.
- the structure in the present invention is simple and requires a small number of components, it is advantageous in reducing the height and volume of the motor, reducing the production difficulty and the motor cost, and improving the reliability.
- the technical problem to be solved by the present invention is to provide a simple structure, which is advantageous for reducing the height of the motor, making good use of the limited space, increasing the height of the magnetic pole surface of the magnet, achieving a sufficient linear range of the motor stroke, and super-macro training. And optical image stabilization.
- the present invention reduces the focusing power consumption and the transmission by increasing the height of the magnetic pole surface and the design of the center motor. Heat, improve the endurance and image quality of imaging equipment.
- the magnet is mounted on the inner wall of the outer casing and is a non-moving structure, so that the voice coil motor is not susceptible to external magnetic fields during operation.
- the present invention can prevent the preload of the shrapnel by raising the shrapnel of the base boss, thereby eliminating the focusing power consumption caused by offsetting the preload of the shrapnel, thereby achieving more power saving and reducing the heat of the motor. Impact on nearby devices. For example: Glue lenses are more likely to change optical properties due to temperature rise, which may reduce lens resolution and reduce image quality.
- the base 1 can be uniformly distributed with three base bosses, and the magnets and the coils are respectively three groups. Similarly, five or more base bosses may be employed, and the magnets and the coils are respectively five or more groups, and the explanation will not be repeated here.
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Abstract
超薄移轴中置式光学防抖音圈马达，涉及音圈马达技术领域，解决现今移轴式光学防抖音圈马达功耗过大，马达结构复杂，不适合超薄的手提式摄影装置，线性区不足，影响对焦性能及限制对焦最近距离的问题。马达包括底座（1）、镜头载体（2）和外壳（3）；底座（1）上设有三个以上的底座凸台（11），每个底座凸台（11）上通过一组弹片（4）与镜头载体（2）的外侧壁连接；外壳（3）安装于底座（1）上，外壳（3）内侧壁上设有三组以上的磁石（5），每组磁石（5）包含一块单面双极磁石；或者每组磁石（5）由两块磁石组成，每块磁石的磁极方向是相反的；有效减低对焦功耗，延长影像装置的续航力，减低马达热力对在马达附近的部件造成的影响。
Description
超薄移轴中置式光学防抖音圈马达 技术领域
[0001] 本发明涉及到音圈马达技术领域， 尤其是涉及到用于应用于微型影像装置中的 实现自动对焦的移轴式光学防抖音圈马达结构改进方面。
背景技术
[0002] 现今多自由度的微型镜头平移式光学防抖音圈马达已被广泛应用在高端的手机 ， 它们的主要透过自动对焦及光学防抖的功能， 达致提高相片及影像质素的效 果。 另一方面， 微型镜头倾斜式光学防抖音圈马达除了能支持自动对焦及光学 防抖外， 还能够支持三维对焦， 移轴摄影， 以及自动对焦吋的光轴倾斜补偿， 进一步扩阔摄影的特别效果。
[0003] 但是， 传统下沉式镜头倾斜式马达 (例如: CN200810109066)需要较大功率克服 弹簧预压力， 才能达致自动对焦效果。 因此， 有不少公司已提出中置式光学防 抖音圈马达结构， 节省因克服所述弹簧预压力所需的功率， 达致更省电。
[0004] 但是， 这些中置式光学防抖音圈马达设计中 (例如：
CN201420281672及 CN2014201809803)部份磁极面高度受到原理上的限制， 所述 的磁极面高度占马达总高度百分比较低。 当马达的总高度受到限制吋， 某些磁 石的高度无可避免地会变成太低， 影响对焦行程的线性区， 最终限制了马达对 焦最近距离， 以及对焦的准确性。
[0005] 另外， 所述的中置式光学防抖音圈马达结构复杂， 部件较多， 不利于生产， 降 低成本， 以及降低高度。
技术问题
[0006] 综上所述， 本发明的目的在于解决现今移轴式光学防抖音圈马达的以下问题： [0007] 1. 功耗过大， 影响续航力， 发出的热力有机会影响附近部件；
[0008] 2. 马达结构复杂， 不利于生产及降低成本；
[0009] 3. 马达高度过高， 不适合超薄的手提式摄影装置 (例如： 智能手机)；
[0010] 4. 部份磁极面高度受到限制， 做成马达行程的线性区不足， 影响对焦性能及
限制对焦最近距离。
问题的解决方案
技术解决方案
[0011] 为解决上述技术问题， 采用的技术方案为： 超薄移轴中置式光学防抖音圈马达
， 包括有底座、 镜头载体和外壳； 其特征在于： 所述的底座上设有三个以上的 底座凸台， 每个底座凸台上通过一组弹片与镜头载体连接； 所述的外壳安装于 底座上， 外壳内侧壁上设有三组以上的磁石， 每组磁石的同一侧面包含极性相 异上下分布的上磁极面和下磁极面； 所述的镜头载体的外侧壁上设有与各组磁 石分别一一对应的三组以上的线圈， 线圈通过弹片与底座上的引脚端子电性连 接。
[0012] 作为对本发明作进一步优选的技术方案包括有：
[0013] 每组磁石包含一块单面双极磁石； 或者每组磁石由两块磁石组成， 每块磁石的 磁极方向是相反的。
[0014] 相邻两组所述磁石之间分布有一个所述底座凸台。
[0015] 所述的镜头载体的外侧壁与线圈对应位置设有线圈凸台， 线圈绕制在线圈凸台 上。
[0016] 所述的镜头载体顶部设有限位槽， 外壳的顶部设有向内翻转至所述限位槽中的 限位块， 限位槽与限位块间隙配合。
[0017] 所述的镜头载体与底座之间还设有仅用于机械连接的固定弹片。
[0018] 每一组弹片由两片实现两个电通路的子弹片构成。
[0019] 底座上均匀分布三个或四个底座凸台， 所述的磁石和线圈分别为三组或四组。
[0020] 当磁石和线圈分别为四组吋， 四组线圈分布在镜头载体的四个外侧面， 相对的 两组线圈串联构成一个线圈组。
发明的有益效果
有益效果
[0021] 本发明的有益效果为： 本发明能同吋支持三维对焦， 自动对焦吋的光轴倾斜补 偿， 以及光学防抖功能。 由于本发明简化马达的结构， 减低马达高度， 因此可 以应用在微型影像装置。 例如： 手机中的相机模組。
[0022] 相比现有下沉式移轴式光学防抖音圈马达马达结构， 本发明能有效减低对焦功 耗， 延长影像装置的续航力， 减低马达热力对在马达附近的部件做成的影响。 例如： 马达发出过量热力吋， 会增加影像传感器的温度， 以及影像中的杂讯。 另外， 相比下沉式或其他中置式马达结构， 本发明能善用马达有限的高度空间 ， 尽量提高磁石每个磁极面的高度， 提高马达行程的线性区以及支持超微距拍 摄。 最后， 本发明中的马达结构简单， 能减低生产的难度， 降低生产及物料成 本。
对附图的简要说明
附图说明
[0023] 图 1为本发明的立体结构示意图；
[0024] 图 2为本发明的分解结构示意图；
[0025] 图 3为本发明去掉外壳吋的内部结构示意图；
[0026] 图 4为图 1中的 A— A剖视结构示意图；
[0027] 图 5为图 1中的 B— B剖视结构示意图。
实施该发明的最佳实施例
本发明的最佳实施方式
[0028] 以下结合附图和对本发明优选的具体实施例对本发明的结构作进一步地说明。
[0029] 具体实施例 1
[0030] 为了使本发明所要解决的技术问题、 技术方案及有益效果更加清楚明白， 以下 结合附图及实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的 具体实施例仅仅用以解释本发明， 并不用于限定本发明。
[0031] 参照图 1至图 5中所示， 本发明的超薄移轴中置式光学防抖音圈马达， 包括有底 座 1、 镜头载体 2和外壳 3三大部分。
[0032] 所述的底座 1上均匀分布四个的底座凸台 11， 每个底座凸台 11上通过一组弹片 4 与镜头载体 2的外侧壁连接； 镜头载体 2的外侧壁居中的高度通过连接块 21与弹 片 4连接； 每组弹片 4包含有两片实现两个电通路的子弹片构成， 也即四组弹片 4 也即可实现八个电通路。
[0033] 外壳 3安装于底座 1上， 外壳 3四个方向的内侧壁上总共设有四组磁石 5， 镜头载
体 2的外侧壁上与四组磁石 5对应位置设有四个线圈凸台 22， 各线圈凸台 22上绕 制有与四组磁石 5对应的线圈 6; 四组线圈 6可以通过一组对应的弹片 4与底座 1上 的引脚端子电性连接。 在具体实施过程中， 也可以将相对的两组线圈串联构成 一个线圈组， 每个线圈组由构成两个电通路的子弹片与底座 1上的引脚端子电性 连接， 通过引脚端子与外部控制电路连接， 外部控制电路通过控制流经各组线 圈的电流方向和电流大小， 可以独立改变每组线圈的磁力及力矩， 达致三轴控 制。
[0034] 优选方案是相邻两组磁石 5之间分布有一个底座凸台 11， 也即是底座凸台 11上 方不会设有所述的磁石， 底座凸台 11分布在底座 1的四角位置。 另外， 如图 4中 所示， 每组磁石 5的同一侧面包含极性相异上下分布的上磁极面 51和下磁极面 52 ； 两个磁极面 51、 52的极性方向是相反， 所以线圈的电磁力方向是和光轴平行 ， 达致对焦及镜头移轴式光学防抖功能。
[0035] 由于每组磁石上方及下方只有两个较薄的部件， 即是外壳及底座， 因此每组磁 石能善用马达大部份的高度； 因为所述的两个磁极面的高度较高， 所以能有效 提高对焦行程的线性区， 以及减低功耗； 虽然本实施案子中的超薄马达高度受 到限制， 但仍然可以达致良好对焦功能， 以及超微距效果。
[0036] 为了实现镜头载体 2机械限位， 增加抗跌可靠性， 镜头载体 2顶部设有限位槽 23 ， 外壳 3的顶部设有向内翻转至所述限位槽 23中的限位块 31， 限位槽 23与限位块 31间隙配合， 限制镜头载体 2在有效范围内活动。
[0037] 为了增强镜头载体 2与底座 1之间连接的稳定性， 可以根据需要在镜头载体 2与 底座 1之间设有仅用于机械连接的固定弹片， 固定弹片与所述的镜头载体及外壳 或底座机械连接， 但不会作为通电用途。
[0038] 由于本发明中的结构简单， 需要部件数目较小， 因此有利于减小马达高度及体 积， 降低生产难度及马达成本， 以及提高可靠性。
[0039] 本发明所要解决的技术问题在于提供一种结构简单， 有利于减低马达高度， 善 用有限空间， 提升磁石磁极面高度， 达致足够的马达行程线性区， 及超微距功 育 ， 以及光学防抖功能。
[0040] 另外， 本发明通过提高磁极面高度， 以及中置式马达设计， 减低对焦功耗及发
热量， 提高影像设备的续航力及影像质素。
[0041] 最后， 在本发明设计中磁石安装于外壳的内壁上， 属于不动结构， 所以音圈马 达在工作吋不容易受到外来磁场的影响。
[0042] 参照图 5中所示， 本发明通过把底座凸台抬高弹片， 能避免弹片预压， 省却因 抵消弹片预压力做成的对焦功耗， 达致更省电， 以及减低马达热力对附近装置 的影响。 例如： 胶镜片较容易会因为升温改变光学特性， 有可能会减低镜头解 像度， 降低影像质素。
[0043] 以上仅是以底座 1上均匀分布四个底座凸台 11， 所述的磁石 5和线圈 6分别为四 组为例说明。
[0044] 具体实施例 2
[0045] 根据具体实施例 1相同原理， 底座 1上可以采用均匀分布三个底座凸台， 所述的 磁石和线圈分别为三组。 同样， 还可以采用五个或更多个底座凸台， 磁石和线 圈分别为五组或更多组， 在此不再重复解释说明。
[0046] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保 护范围之内。
Claims
权利要求书
超薄移轴中置式光学防抖音圈马达， 包括有底座、 镜头载体和外壳； 其特征在于： 所述的底座上设有三个以上的底座凸台， 每个底座凸 台上通过一组弹片与镜头载体连接； 所述的外壳安装于底座上， 外 壳内侧壁上设有三组以上的磁石， 每组磁石的同一侧面包含极性相异 上下分布的上磁极面和下磁极面； 所述的镜头载体的外侧壁上设有 与各组磁石分别一一对应的三组以上的线圈， 线圈通过弹片与底座上 的引脚端子电性连接。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 每组磁石包含一块单面双极磁石。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 每组磁石由两块磁石组成， 每块磁石的磁极方向是相反的。 根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 相邻两组所述磁石之间分布有一个所述底座凸台。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 所述的镜头载体的外侧壁与线圈对应位置设有线圈凸台， 线圈绕 制在线圈凸台上。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 所述的镜头载体顶部设有限位槽， 外壳的顶部设有向内翻转至所 述限位槽中的限位块， 限位槽与限位块间隙配合。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 所述的镜头载体与底座之间还设有仅用于机械连接的固定弹片。 根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 每一组弹片由两片实现两个电通路的子弹片构成。
根据权利要求 1所述的超薄移轴中置式光学防抖音圈马达， 其特征在 于： 底座上均匀分布三个或四个底座凸台， 所述的磁石和线圈分别为 三组或四组。
根据权利要求 9所述的超薄移轴中置式光学防抖音圈马达， 其特征在
于： 当磁石和线圈分别为四组吋， 四组线圈分布在镜头载体的四个外 侧面， 相对的两组线圈串联构成一个线圈组。
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