CN103529536A - Actuator and camera module with same - Google Patents

Abstract

The invention relates to an actuator, which comprises a base, a fixed frame, a movable frame and a driving unit. The fixed frame is fixedly arranged on the base, and the movable frame is accommodated in the fixed frame and is supported on the base. The movable frame includes a support surface facing the base. The drive unit includes an SMA wire, a controller, a position sensor, and a guide rod. The SMA wire comprises a bending part positioned between the two ends, the bending part is abutted against the abutting surface, and the guide rod penetrates through the movable frame and is fixed on the base. The controller is used for applying current to heat the SMA wires so as to change the lengths of the SMA wires and drive the movable frame to move along the guide rods. The position sensor is used for sensing the position of the movable frame and transmitting the sensing result to the controller. The controller is also used for adjusting the current according to the sensing result.

Description

Translated fromChinese

致动器及具有该致动器之相机模块Actuator and camera module with same

技术领域technical field

本发明涉及成像领域，尤其涉及一种致动器及具有该致动器之相机模块。The invention relates to the field of imaging, in particular to an actuator and a camera module with the actuator.

背景技术Background technique

随着通讯技术的快速发展，相机模块已被人们广泛地应用于手机等便携式电子设备中。为了提高相机模块所拍摄的图片质量，相机模块一般都具有变焦功能，并具有可驱动相机模块进行变焦之致动器。With the rapid development of communication technology, camera modules have been widely used in portable electronic devices such as mobile phones. In order to improve the quality of pictures taken by the camera module, the camera module generally has a zoom function, and has an actuator that can drive the camera module to zoom.

先前技术中有多种致动器，其中一种致动器为形状记忆合金（Shape Memory Alloy，SMA）致动器，然而，形状记忆合金致动器的对焦精度不高。There are many kinds of actuators in the prior art, one of which is a shape memory alloy (Shape Memory Alloy, SMA) actuator, however, the focusing accuracy of the shape memory alloy actuator is not high.

发明内容Contents of the invention

有鉴于此，有必要提供一种可实现精确对焦之致动器及具有该致动器之相机模块。In view of this, it is necessary to provide an actuator capable of achieving precise focusing and a camera module with the actuator.

一种致动器，其包括底座、固定架、可动架以及驱动单元。所述固定架固设于所述底座上，所述可动架收容于所述固定架内并承载于所述底座上。所述可动架包括一面向所述底座之抵持面。所述驱动单元包括SMA线、控制器、位置传感器和导引杆。所述SMA线的两端固定于所述固定架上，所述SMA线包括位于该两端之间的弯折部，所述弯折部与所述抵持面抵触，所述导引杆穿过所述可动架并固定于所述底座上。所述控制器用于施加电流加热SMA线以改变SMA线的长度以驱使所述可动架沿所述导引杆运动。所述位置传感器用于感测所述可动架的位置并将感测结果传送到所述控制器。所述控制器还用于根据所述感测结果调整所述电流的大小。An actuator includes a base, a fixed frame, a movable frame and a drive unit. The fixed frame is fixed on the base, and the movable frame is accommodated in the fixed frame and carried on the base. The movable frame includes a resisting surface facing the base. The drive unit includes an SMA wire, a controller, a position sensor and a guide rod. The two ends of the SMA wire are fixed on the fixing frame, the SMA wire includes a bent portion between the two ends, the bent portion is in conflict with the abutment surface, and the guide rod passes through Pass through the movable frame and be fixed on the base. The controller is used for applying current to heat the SMA wire to change the length of the SMA wire to drive the movable frame to move along the guide rod. The position sensor is used to sense the position of the movable frame and transmit the sensing result to the controller. The controller is also used to adjust the magnitude of the current according to the sensing result.

一种相机模块，其包括如上所述之致动器和镜头单元，所述镜头单元收容于所述可动架内。A camera module includes the above-mentioned actuator and a lens unit, and the lens unit is accommodated in the movable frame.

相较于先前技术，所述致动器及所述相机模块具有位置传感器并可根据位置传感器之感测结果调整控制电流，从而提高了对焦精度。Compared with the prior art, the actuator and the camera module have a position sensor and can adjust the control current according to the sensing result of the position sensor, thereby improving the focus precision.

附图说明Description of drawings

图1为本发明提供的相机模块的立体示意图。FIG. 1 is a schematic perspective view of a camera module provided by the present invention.

图2为图1中的相机模块的分解示意图。FIG. 2 is an exploded schematic view of the camera module in FIG. 1 .

图3为图1中的相机模块的III-III向剖视图。FIG. 3 is a sectional view along line III-III of the camera module in FIG. 1 .

主要组件符号说明Explanation of main component symbols

相机模块camera module100100致动器actuator200200底座base1010出光孔light hole101101上表面upper surface102102凸板Convex plate103103凸柱Boss104104固定孔Fixing hole105105定位柱positioning post106106定位孔positioning hole107107弹片shrapnel1111突耳ear111111通孔through hole112112固定架Fixture1212第一侧壁first side wall120120第二侧壁second side wall121121容纳槽storage tank122122滑槽Chute123123凸柱Boss124124容纳槽storage tank125125避位槽Avoidance slot126126容纳孔Accommodating hole127127激光直接成型线(LDS线）Laser Direct Structuring Line (LDS Line)128128可动架Movable frame1414外表面The outer surface140140滑块slider141141突耳ear142142容纳槽storage tank143143抵持面Resisting surface144144通孔through hole145145镜头单元lens unit1515镜筒lens barrel150150镜片lens151151驱动单元Drive unit1616电路板circuit board160160控制器controller161161位置传感器position sensor162162磁铁magnet163163电阻夹持件Resistor Holder164164形状记忆合金线（SMA线）Shape memory alloy wire (SMA wire)165165导引杆guide rod166166夹持槽Clamping groove167167焊接头welding head168168固定孔Fixing hole169169弹性件Elastic170170

如下具体实施方式将结合上述附图进一步说明本发明。The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

具体实施方式Detailed ways

请参阅图1至图3，为本发明一实施方式的相机模块100。所述相机模块100包括致动器200和镜头单元15。所述致动器200包括底座10、弹片11、固定架12、可动架14、及驱动单元16。Please refer to FIG. 1 to FIG. 3 , which illustrate acamera module 100 according to an embodiment of the present invention. Thecamera module 100 includes anactuator 200 and alens unit 15 . Theactuator 200 includes abase 10 , anelastic piece 11 , afixed frame 12 , amovable frame 14 , and a driving unit 16 .

所述底座10大致呈平板状。所述底座10的中心位置开设有圆形的出光孔101。所述底座10包括上表面102。所述上表面102的一个角落处形成有凸板103，所述凸板103上形成有凸柱104。与所述凸柱104相对的所述上表面102的另一角落处形成一固定孔105。所述上表面104的另外两角落处分别形成有定位柱106和定位孔107。Thebase 10 is roughly flat. A circular light exit hole 101 is defined at the center of thebase 10 . Thebase 10 includes an upper surface 102 . A convex plate 103 is formed at a corner of the upper surface 102 , and a protruding post 104 is formed on the convex plate 103 . A fixing hole 105 is formed at another corner of the upper surface 102 opposite to the protrusion 104 . Positioning pillars 106 and positioning holes 107 are respectively formed at the other two corners of the upper surface 104 .

所述弹片11呈圈状，弹片11的内径大于出光孔101的直径。所述弹片11上对称形成有两突耳111，每一突耳111上形成一通孔112。Theelastic sheet 11 is in a ring shape, and the inner diameter of theelastic sheet 11 is larger than the diameter of the light exit hole 101 . Two lugs 111 are symmetrically formed on theelastic piece 11 , and a through hole 112 is formed on each lug 111 .

所述固定架12大致呈方形筒状，包括两彼此邻接的第一侧壁120和两彼此邻接的第二侧壁121。所述第一侧壁120上形成有容纳槽122。所述第一侧壁120和所述第二侧壁121之间的角落处内侧壁上形成有滑槽123。每个所述第二侧壁121的外表面上形成有两个凸柱124和一个容纳槽125。所述凸柱124靠近第一侧壁120，所述容纳槽125从所述凸柱124延伸至另一第二侧壁121。两个第二侧壁121之间的角落处的下部形成有避位槽126，上部形成有容纳孔127，容纳孔127为阶梯孔。每个第二侧壁121的外表面上靠近凸柱124处还形成有激光直接成型线（LDS, Laser Direct Structuring）128,每个LDS线128从第二侧壁121延伸至对应的第一侧壁120。所述固定架12的底面上形成有对应底座上定位柱106的定位孔和对应定位孔107的定位柱（图未示）。The fixingbracket 12 is substantially square and includes two first side walls 120 adjacent to each other and two second side walls 121 adjacent to each other. A receiving groove 122 is formed on the first side wall 120 . A slide groove 123 is formed on an inner wall at a corner between the first side wall 120 and the second side wall 121 . Two protrusions 124 and a receiving groove 125 are formed on the outer surface of each of the second sidewalls 121 . The protrusion 124 is close to the first side wall 120 , and the receiving groove 125 extends from the protrusion 124 to another second side wall 121 . An escape groove 126 is formed at the lower part of the corner between the two second side walls 121 , and an accommodating hole 127 is formed at the upper part, and the accommodating hole 127 is a stepped hole. Laser Direct Structuring (LDS, Laser Direct Structuring) 128 is also formed on the outer surface of each second side wall 121 near the protrusion 124, and each LDS line 128 extends from the second side wall 121 to the corresponding first side wall 120. A positioning hole corresponding to the positioning post 106 on the base and a positioning post corresponding to the positioning hole 107 are formed on the bottom surface of the fixing frame 12 (not shown).

所述可动架14大致呈圆形筒状，可动架14内收容镜头单元15，在本实施方式中，镜头单元15和可动架14通过螺纹螺接的方式固定在一起。镜头单元15包括镜筒150和收容于镜筒150内的镜片151。可动架14的外表面140上形成有两彼此相对的滑块141，一位于两滑块141之间的弧形阶梯状突耳142，和一与突耳142相对的容纳槽143。突耳142上形成有一面向底座10的抵持面144。突耳142内形成有一阶梯通孔145。Themovable frame 14 is generally cylindrical in shape, and thelens unit 15 is accommodated in themovable frame 14 . In this embodiment, thelens unit 15 and themovable frame 14 are fixed together by screwing. Thelens unit 15 includes alens barrel 150 and alens 151 accommodated in thelens barrel 150 . Two sliding blocks 141 opposite to each other are formed on the outer surface 140 of themovable frame 14 , an arc-shaped stepped lug 142 located between the two sliding blocks 141 , and a receiving groove 143 opposite to the lug 142 . A resisting surface 144 facing thebase 10 is formed on the protrusion 142 . A stepped through hole 145 is formed in the protruding ear 142 .

所述驱动单元16包括电路板160、安装于电路板160上的控制器161、位置传感器162、磁铁163、两电阻夹持件164、一形状记忆合金线（Shape Memory Alloy，SMA）165、一导引杆166、和一弹性件170。其中，在本实施方式中，位置传感器162为霍尔磁性传感器。电阻夹持件164为金属导电弹片，电阻夹持件164上形成有经金属弯曲形成的夹持槽167、和经金属延伸形成的焊接头168，电阻夹持件164上还形成有固定孔169。弹性件170为弹簧。The drive unit 16 includes a circuit board 160, acontroller 161 installed on the circuit board 160, aposition sensor 162, amagnet 163, two resistor clamps 164, a shape memory alloy wire (Shape Memory Alloy, SMA) 165, a Theguide rod 166 and anelastic member 170 . Wherein, in this embodiment, theposition sensor 162 is a Hall magnetic sensor. The resistor clamping piece 164 is a metal conductive shrapnel. The resistor clamping piece 164 is formed with a clamping groove 167 formed by metal bending and a welding head 168 formed by metal extension. The resistor clamping piece 164 is also formed with a fixing hole 169 . Theelastic member 170 is a spring.

当组装时，将弹片11置于底座10上，使得凸柱104穿过弹片11的一通孔112，导引杆166穿过弹片11的另一通孔112进入底座10的固定孔105内，从而将弹片11固定于底座10上；将磁铁163通过胶粘式固定于可动架14的容纳槽143内，将可动架14通过胶粘方式固定于弹片11上，使得导引杆166穿过可动架14的突耳142上的阶梯通孔145，弹性件170套于导引杆166上，弹性件170部分的置于阶梯通孔145内；将固定架12置于底座10上，使得滑块141置于滑槽123内，突耳142置于避位槽126内，导引杆166穿过容纳孔127，通过胶粘方式将固定架12固定于底座10上；将两电阻夹持件164通过固定孔169和凸柱124的配合固定于固定架12上，电阻夹持件164的焊接头168通过焊接的方法与LDS线128连接；将SMA线165置于固定架12的容纳槽125内，SMA线165的两端分别夹持在电阻夹持件164的夹持槽167内，SMA线165两端之间的部分弯折绕过可动架14的突耳142且与抵持面144抵触；将电路板160固定于固定架12上，位置传感器162穿过容纳槽122与磁铁163相对，电路板160通过焊接方式与LDS线128连接，从而完成致动器200的组装。When assembling, the elastic piece 11 is placed on the base 10, so that the boss 104 passes through a through hole 112 of the elastic piece 11, and the guide rod 166 passes through another through hole 112 of the elastic piece 11 and enters the fixing hole 105 of the base 10, thereby placing the The elastic piece 11 is fixed on the base 10; the magnet 163 is fixed in the receiving groove 143 of the movable frame 14 by gluing, and the movable frame 14 is fixed on the elastic piece 11 by gluing, so that the guide rod 166 can pass through The stepped through hole 145 on the lug 142 of the moving frame 14, the elastic piece 170 is sleeved on the guide rod 166, and part of the elastic piece 170 is placed in the stepped through hole 145; the fixed frame 12 is placed on the base 10, so that the sliding The block 141 is placed in the chute 123, the lug 142 is placed in the avoidance groove 126, the guide rod 166 passes through the receiving hole 127, and the fixing frame 12 is fixed on the base 10 by gluing; 164 is fixed on the fixed frame 12 through the cooperation of the fixing hole 169 and the boss 124, and the welding head 168 of the resistance clamp 164 is connected to the LDS line 128 by welding; the SMA line 165 is placed in the receiving groove 125 of the fixed frame 12 Inside, the two ends of the SMA wire 165 are respectively clamped in the clamping groove 167 of the resistance clamping member 164, and the part between the two ends of the SMA wire 165 is bent around the lug 142 of the movable frame 14 and is in contact with the abutment surface. 144 conflict; the circuit board 160 is fixed on the fixedframe 12, theposition sensor 162 passes through the receiving groove 122 and is opposite to themagnet 163, and the circuit board 160 is connected with the LDS line 128 by welding, thereby completing the assembly of theactuator 200.

当作动时，控制器161提供驱动电流，驱动电流通过LDS线128、电阻夹持件164而加热SMA线165，SMA线165受热缩短，从而驱动可动架14向远离底座10的方向移动，从而完成变焦。由于导引杆166和通孔145的限制，使得可动架14只能沿着导引杆166延伸的方向移动，从而，本发明只需要使用一根SMA线即可驱动可动架14完成变焦。When in action, thecontroller 161 provides a driving current, and the driving current passes through the LDS wire 128 and the resistance clamping member 164 to heat theSMA wire 165, and theSMA wire 165 is shortened by heat, thereby driving themovable frame 14 to move away from thebase 10, Thus zooming is completed. Due to the restriction of theguide rod 166 and the through hole 145, themovable frame 14 can only move along the direction in which theguide rod 166 extends, thus, the present invention only needs to use one SMA wire to drive themovable frame 14 to complete zooming .

SMA线165收缩的长度和温度有着对应关系，然而，由于环境温度的影响，即使给SMA线165施加相同的驱动电流，在环境温度不同时也会导致SMA线165被加热的程度不同，从而SMA线165收缩的程度不同。为了实现精确变焦，本发明使用了位置传感器162。在可动架14的移动过程中，位置传感器162感测固定于可动架14上的磁铁163的磁场强度变化，从而感测可动架14的位置变化，并将结果回传给控制器161，控制器161根据感测结果调整驱动电流，从而实现精确对焦。例如，当可动架14移动的距离超过预定距离时，控制器161减少驱动电流，从而使得SMA线165变长，从而控制可动架14移动到预定距离；当经过预定的时间可动架14还没有移动到预定距离时，控制器161增大驱动电流，从而使得SMA线165进一步缩短，从而控制可动架14移动到预定距离。The shrinkage length of theSMA wire 165 has a corresponding relationship with the temperature. However, due to the influence of the ambient temperature, even if the same driving current is applied to theSMA wire 165, the degree of heating of theSMA wire 165 will be different when the ambient temperature is different, so that the SMA The degree of shrinkage of thewire 165 varies. To achieve precise zooming, the present invention uses aposition sensor 162 . During the moving process of themovable frame 14, theposition sensor 162 senses the change of the magnetic field strength of themagnet 163 fixed on themovable frame 14, thereby sensing the position change of themovable frame 14, and sending the result back to thecontroller 161 , thecontroller 161 adjusts the driving current according to the sensing result, so as to achieve precise focusing. For example, when the moving distance of themovable frame 14 exceeds the predetermined distance, thecontroller 161 reduces the driving current, thereby making theSMA wire 165 longer, thereby controlling themovable frame 14 to move to the predetermined distance; When the predetermined distance has not been moved, thecontroller 161 increases the driving current, so that theSMA wire 165 is further shortened, thereby controlling themovable frame 14 to move to the predetermined distance.

在可动架14向远离底座10方向移动时，弹片11受力伸长，弹性件170受力压缩。当控制器161停止提供驱动电流时，SMA线165冷却伸长，弹片11和弹性件170弹性回复，从而驱使可动架14回到初始位置。When themovable frame 14 moves away from thebase 10 , theelastic piece 11 is stretched under force, and theelastic member 170 is compressed under force. When thecontroller 161 stops providing the driving current, theSMA wire 165 cools and stretches, and theelastic piece 11 and theelastic member 170 return elastically, thereby driving themovable frame 14 back to the initial position.

可以理解，所述固定架12并不局限于本实施方式藉由胶合方式固设于所述底座10上，还可以藉由卡合方式固设于所述底座10上。It can be understood that the fixingframe 12 is not limited to being fixed on thebase 10 by gluing in this embodiment, and can also be fixed on thebase 10 by snapping.

可以理解，所述位置传感器162并不局限于本实施方式的霍尔磁性传感器，其还可以是其它类型的位置传感器，例如光电位置传感器。It can be understood that theposition sensor 162 is not limited to the Hall magnetic sensor of this embodiment, and it can also be other types of position sensors, such as photoelectric position sensors.

总之，本技术领域的普通技术人员应当认识到，以上的实施方式仅是用来说明本发明，而并非用作为对本发明的限定，只要在本发明的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本发明要求保护的范围之内。In a word, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention, as long as within the spirit of the present invention, the above examples Appropriate changes and changes all fall within the scope of protection of the present invention.

Claims (10)

Translated fromChinese

1.一种致动器，其包括底座、固定架、可动架以及驱动单元，所述固定架固设于所述底座上，所述可动架收容于所述固定架内并承载于所述底座上，其改进在于，所述可动架包括一面向所述底座之抵持面；所述驱动单元包括SMA线、控制器、位置传感器和导引杆；所述SMA线的两端固定于所述固定架上，所述SMA线包括位于该两端之间的弯折部，所述弯折部与所述抵持面抵触，所述导引杆穿过所述可动架并固定于所述底座上；所述控制器用于施加电流加热SMA线以改变SMA线的长度以驱使所述可动架沿所述导引杆运动；所述位置传感器用于感测所述可动架的位置并将感测结果传送到所述控制器；所述控制器还用于根据所述感测结果调整所述电流的大小。1. An actuator comprising a base, a fixed frame, a movable frame and a drive unit, the fixed frame is fixed on the base, the movable frame is accommodated in the fixed frame and carried on the On the above-mentioned base, the improvement is that the movable frame includes an abutting surface facing the base; the driving unit includes an SMA wire, a controller, a position sensor and a guide rod; the two ends of the SMA wire are fixed On the fixed frame, the SMA wire includes a bent portion located between the two ends, the bent portion is in conflict with the abutment surface, the guide rod passes through the movable frame and is fixed on the base; the controller is used to apply current to heat the SMA wire to change the length of the SMA wire to drive the movable frame to move along the guide rod; the position sensor is used to sense the movable frame position and transmit the sensing result to the controller; the controller is also used to adjust the magnitude of the current according to the sensing result.2.如权利要求1所述之致动器，其中，所述固定架藉由胶合方式固设于所述底座上。2. The actuator according to claim 1, wherein the fixing frame is fixed on the base by gluing.3.如权利要求1所述之致动器，其中，所述致动器还包括一连接所述底座与所述可动架的弹片。3. The actuator according to claim 1, wherein the actuator further comprises an elastic piece connecting the base and the movable frame.4.如权利要求1所述之致动器，其中，所述导引杆远离所述底座的一端穿过所述固定架。4. The actuator according to claim 1, wherein an end of the guide rod away from the base passes through the fixing frame.5.如权利要求4所述之致动器，其中，所述导引杆上套有弹性件，所述弹性件分别抵持所述固定架和所述可动架。5 . The actuator as claimed in claim 4 , wherein an elastic member is covered on the guide rod, and the elastic member resists the fixed frame and the movable frame respectively. 6 .6.如权利要求1所述之致动器，其中，所述位置传感器固定于所述固定架上，所述位置传感器为霍尔磁性传感器，所述驱动单元还包括位于所述可动架上且与所述位置传感器相对的磁铁。6. The actuator according to claim 1, wherein the position sensor is fixed on the fixed frame, the position sensor is a Hall magnetic sensor, and the drive unit further includes and a magnet opposite to the position sensor.7.如权利要求1所述之致动器，其中，所述驱动单元还包括电阻夹持件，所述电阻夹持件固定于所述固定架上，所述SMA线的该两端夹持于所述电阻夹持件上。7. The actuator according to claim 1, wherein the drive unit further comprises a resistor clamping piece, the resistor clamping piece is fixed on the fixed frame, and the two ends of the SMA wire are clamped on the resistor holder.8.如权利要求7所述之致动器，其中，所述电子夹持件与所述控制器通过激光直接成型线连接。8. The actuator of claim 7, wherein the electronic gripper is connected to the controller by a laser direct structuring line.9.一种相机模块，其包括如权利要求1所述之致动器和镜头单元，所述镜头单元收容于所述可动架内。9. A camera module, comprising the actuator according to claim 1 and a lens unit, the lens unit being accommodated in the movable frame.10.如权利要求9所述之相机模块，其中，所述镜头单元包括镜筒及收容于所述镜筒内之镜片。10. The camera module according to claim 9, wherein the lens unit comprises a lens barrel and a lens accommodated in the lens barrel.

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