TW201817154A - Driving control device for voice coil motor and method of using the same - Google Patents
Driving control device for voice coil motor and method of using the same Download PDFInfo
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Abstract
Description
本發明關於一種使相機模組的鏡頭移動的音圈馬達(Voice Coil Motor；以下簡稱VCM)的驅動控制，尤其關於一種在鏡頭的初始驅動或著地(landing)時能夠降低噪音並縮短移動時間的VCM驅動控制裝置及VCM驅動控制方法。 The present invention relates to a drive control of a voice coil motor (VCM) that moves a lens of a camera module, and more particularly to reducing noise and shortening movement time during initial driving or landing of the lens. The VCM drive control device and the VCM drive control method.
如智慧型手機、數位相機等攜帶式IT(Information Technology；資訊科技)設備內建有用於拍攝視頻或拍照的相機模組。上述相機模組包括VCM，該VCM用作為對焦被攝體而使鏡頭移動的手段。 Portable IT (Information Technology) devices such as smart phones and digital cameras have built-in camera modules for taking video or taking pictures. The camera module includes a VCM that serves as a means for focusing the subject and moving the lens.
圖1為示意性顯示適用VCM的一般相機模組的剖視圖。如圖1所示，與鏡頭11的側面結合的音圈驅動器(VCA；Voice Coil Actuator)12位於外殼13的線筒支撐部14的上部。音圈驅動器12由永磁體12B和線筒12A構成。 1 is a cross-sectional view schematically showing a general camera module to which a VCM is applied. As shown in FIG. 1, a voice coil actuator (VCA) 12 coupled to the side surface of the lens 11 is located at an upper portion of the bobbin support portion 14 of the outer casing 13. The voice coil driver 12 is composed of a permanent magnet 12B and a bobbin 12A.
當具有上述結構的相機模組10從操作模式轉換成相機停止模式時，相機的電源關閉。在這種情況下，線筒12A藉助彈簧19的力量而使鏡頭11移動到底面16。如上前述，在鏡頭11移動到底面16時，線筒12A的下端部12C和外殼13的線筒支撐部 14碰撞，從而產生噪音。這種噪音又稱作VCM異音。 When the camera module 10 having the above configuration is switched from the operation mode to the camera stop mode, the power of the camera is turned off. In this case, the bobbin 12A moves the lens 11 to the bottom surface 16 by the force of the spring 19. As described above, when the lens 11 is moved to the bottom surface 16, the lower end portion 12C of the bobbin 12A collides with the bobbin supporting portion 14 of the outer casing 13, thereby generating noise. This noise is also known as VCM abnormal sound.
為了抑制上述噪音的產生，在從操作模式轉換成相機停止模式時，不是通過關閉對VCM施加的電流而是通過線性減少對VCM施加的電流來最小化在線筒12A的下端部12C與外殼13的線筒支撐部14碰撞時產生的噪音的技術也被提出。然而，雖然上述技術也是一種可以最小化VCM異音的方法，但因線性減少VCM施加電流而鏡頭移動到底面所需的時間延長。 In order to suppress the generation of the above noise, when switching from the operation mode to the camera stop mode, the lower end portion 12C of the bobbin 12A and the outer casing 13 are minimized not by turning off the current applied to the VCM but by linearly reducing the current applied to the VCM. A technique of noise generated when the bobbin support portion 14 collides is also proposed. However, although the above technique is also a method for minimizing VCM noise, the time required for the lens to move to the bottom surface is prolonged by linearly reducing the VCM application current.
並且，如圖2所示，在為使鏡頭移動的驅動初始階段也對VCM施加線性增加的電流，因啟動電流彈簧的彈性模量、靜摩擦力等而在鏡頭開始移動或停止時彈簧發生變形，從而產生噪音。如上前述，還需要能夠除去或最小化由於在鏡頭的驅動初始階段對VCM施加的電流而產生的噪音的方法。 Further, as shown in FIG. 2, a linearly increasing current is applied to the VCM at the initial stage of driving for moving the lens, and the spring is deformed when the lens starts to move or stops due to the elastic modulus, static friction, and the like of the starting current spring. This produces noise. As described above, there is also a need for a method capable of removing or minimizing noise generated due to a current applied to the VCM at the initial stage of driving of the lens.
作為參考，圖2顯示為使鏡頭進行初始驅動而對VCM施加的電流和鏡頭的變位，而圖3顯示為鏡頭恢復到著地位置而對VCM施加的電流和鏡頭的變位。尤其，圖3中顯示根據相機模組的姿勢(朝上(face up)、水平(Horizontal)、朝下(face down))而不同的鏡頭的變位。由圖3可見，鏡頭根據相機模組的姿勢在相互不同的電流值恢復到著地位置。而且，圖2中的“啟動電流(Start Current)”是指在鏡頭啟動時對VCM施加的電流，因此下文中將對VCM施加直到鏡頭啟動為止的電流稱作“啟動電流”。 For reference, FIG. 2 shows the current applied to the VCM and the displacement of the lens for initial driving of the lens, and FIG. 3 shows the current applied to the VCM and the displacement of the lens for the lens to return to the ground position. In particular, the displacement of the lens according to the posture of the camera module (face up, horizontal, face down) is shown in FIG. As can be seen from FIG. 3, the lens returns to the ground position at mutually different current values according to the posture of the camera module. Moreover, "Start Current" in FIG. 2 refers to a current applied to the VCM at the time of lens start, and therefore a current applied to the VCM until the lens is started is referred to as "starting current".
[先前技術文獻] [Previous Technical Literature]
[專利文獻] [Patent Literature]
專利文獻1：美國專利公開號US2012/0200763A1。 Patent Document 1: US Patent Publication No. US 2012/0200763 A1.
專利文獻2：韓國專利公開號10-2006-0080821。 Patent Document 2: Korean Patent Publication No. 10-2006-0080821.
本發明是根據上述缺點的解決和必要性所研製的，本發明的目的在於提供在相機模組的鏡頭的初始驅動和著地時能夠降低VCM異音的產生的VCM驅動控制裝置及VCM驅動控制方法。 The present invention has been developed in accordance with the above-mentioned shortcomings and necessity. The object of the present invention is to provide a VCM drive control device and VCM drive control capable of reducing the generation of VCM abnormal sounds during initial driving and landing of a lens of a camera module. method.
進一步地，本發明的另一個目的在於提供能夠控制驅動VCM以使VCM異音最小化，並縮短其控制時間的VCM驅動控制裝置及其控制方法。 Further, another object of the present invention is to provide a VCM drive control apparatus capable of controlling driving of a VCM to minimize VCM abnormal sound and shortening its control time, and a control method thereof.
為了達到上述目的根據本發明的實施例的音圈馬達(VCM)驅動控制方法是用於控制驅動使相機模組的鏡頭移動的VCM的方法，其包括以下步驟：響應於相機操作命令而對前述VCM施加以第一斜率線性增加到預先設定的第一拐點的電流；及對前述VCM施加從前述拐點起以小於前述第一斜率的第二斜率線性增加到無限位置的電流，以使鏡頭移動到無限位置；其中，前述第一拐點被設定為在鏡頭從停放位置啟動時對VCM施加的鏡頭啟動電流之前的值。 In order to achieve the above object, a voice coil motor (VCM) drive control method according to an embodiment of the present invention is a method for controlling a VCM that drives a lens movement of a camera module, the method comprising the steps of: responsive to a camera operation command VCM applies a current that linearly increases to a preset first inflection point with a first slope; and applies a current that linearly increases to an infinite position from the aforementioned inflection point with a second slope less than the aforementioned first slope from the aforementioned inflection point to move the lens to An infinite position; wherein the aforementioned first inflection point is set to a value before the lens start current applied to the VCM when the lens is activated from the parking position.
進一步地，前述VCM驅動控制方法還包括以下步驟：響應於關閉相機操作命令而對前述VCM施加以第三斜率線性減少到預先設定的第二拐點的電流，以使在鏡頭著地時降低VCM異音；及對前述VCM施加從前述第二拐點起以大於前述第三斜率的第四斜率線性減少到停放位置的電流，以使鏡頭停放；其中，前述 第二拐點被設定為前述鏡頭啟動電流之後的值。 Further, the foregoing VCM driving control method further includes the step of: applying a current linearly decreasing to a second inflection point with a third slope to the aforementioned VCM in response to turning off the camera operation command, so as to reduce the VCM when the lens touches the ground And applying a current linearly decreasing to a parking position from the second inflection point by a fourth slope greater than the third slope from the second inflection point to park the lens; wherein the second inflection point is set to be the aforementioned lens starting current Value.
並且，前述第一拐點或前述第二拐點被設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值。 Further, the first inflection point or the second inflection point is set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position.
前述第一拐點或第二拐點與根據相機模組的姿勢(朝上(face up)、水平(Horizontal)、朝下(face down))而可變的鏡頭啟動電流值相應地被變更設定，且變更設定的各個前述第一拐點或前述第二拐點被設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值。 The first inflection point or the second inflection point is changed in accordance with a lens starting current value that is variable according to a posture of the camera module (face up, horizontal, face down), and Each of the first inflection point or the second inflection point of the change setting is set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position.
另外，根據本發明的另一個實施例的VCM驅動控制裝置包括：控制單元，根據使用者的相機操作控制命令產生並輸出用於使相機模組的鏡頭移動到無限位置或停放位置的VCM驅動控制信號；數位類比轉換器(DAC；Digital to Analog Converter)，用於將前述VCM驅動控制信號轉換為模擬信號；及馬達驅動單元，產生與轉換成模擬信號的前述VCM驅動控制信號對應的電流，並施加給VCM；其中，前述控制單元響應於相機操作命令而產生並輸出用於對前述VCM施加以第一斜率線性增加到預先設定的第一拐點的電流的VCM驅動控制信號和用於對前述VCM施加從前述第一拐點起以小於前述第一斜率的第二斜率線性增加到無限位置的電流的VCM驅動控制信號。 In addition, the VCM drive control apparatus according to another embodiment of the present invention includes: a control unit that generates and outputs a VCM drive control for moving the lens of the camera module to an infinite position or a parking position according to a camera operation control command of the user. a signal; a digital to analog converter (DAC) for converting the aforementioned VCM drive control signal into an analog signal; and a motor drive unit that generates a current corresponding to the aforementioned VCM drive control signal converted into an analog signal, and Applied to the VCM; wherein the foregoing control unit generates and outputs a VCM driving control signal for applying a current linearly increasing to a predetermined first inflection point with a first slope to the aforementioned VCM in response to a camera operation command and for applying to the aforementioned VCM A VCM drive control signal that linearly increases the current to the infinite position from the first inflection point with a second slope less than the aforementioned first slope is applied.
進一步地，前述控制單元響應於關閉相機操作命令而產生並輸出用於對前述VCM施加以第三斜率線性減少到預先設定的第二拐點的電流的VCM驅動控制信號和用於對前述VCM施加從前述第二拐點起以大於前述第三斜率的第四斜率線性減少到停放位 置的電流的VCM驅動控制信號。 Further, the foregoing control unit generates and outputs a VCM driving control signal for applying a current linearly decreasing to a second knee point to the preset second slope to the aforementioned VCM in response to turning off the camera operation command and for applying the slave to the aforementioned VCM The aforementioned second inflection point is a VCM drive control signal that linearly reduces the current to the park position with a fourth slope greater than the aforementioned third slope.
前述第一拐點及前述第二拐點分別被設定為在相機模組的鏡頭從停放位置啟動時對VCM施加的鏡頭啟動電流之前後的值並在前述控制單元的內部存儲器中儲存使用。 The first inflection point and the second inflection point are respectively set to values before and after the lens activation current applied to the VCM when the lens of the camera module is activated from the parking position, and are stored and used in the internal memory of the control unit.
前述第一拐點或前述第二拐點被設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值。 The first inflection point or the second inflection point is set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position.
根據上述實施形態，本發明具有如下功效：當將鏡頭從停放位置移動到無限位置時，控制對VCM施加以相對大的第一斜率線性增加到與鏡頭啟動電流值接近的電流值(拐點)的電流，而控制對VCM施加從前述拐點以小於前述第一斜率的第二斜率線性增加到無限位置的電流，從而可以縮短使鏡頭移動到無限位置所需的時間，並降低VCM異音。 According to the above embodiment, the present invention has the effect of controlling the VCM to be applied linearly to a current value (inflection point) close to the lens starting current value with a relatively large first slope when moving the lens from the park position to the infinite position. The current is applied to the VCM to apply a current that linearly increases from the aforementioned inflection point to a second position less than the aforementioned first slope to an infinite position, thereby reducing the time required to move the lens to the infinite position and reducing the VCM abnormal sound.
在用相同的方法將鏡頭移動到停放位置的情況下也通過施加以緩慢的斜率線性減少到第二拐點的電流來使鏡頭進行移動，從而可以降低在鏡頭啟動電流值附近產生的VCM異音，且通過施加在前述第二拐點之後以急劇的斜率線性減少到停放位置的電流來可以縮短向停放位置的移動時間。 In the case where the lens is moved to the parking position in the same manner, the lens is also moved by applying a current linearly decreasing to the second inflection point with a slow slope, thereby reducing the VCM abnormal sound generated near the lens starting current value, And the movement time to the parking position can be shortened by applying a current linearly decreasing to the parking position with a sharp slope after the aforementioned second inflection point.
10‧‧‧相機模組 10‧‧‧ camera module
11‧‧‧鏡頭 11‧‧‧ lens
12‧‧‧音圈驅動器(VCA) 12‧‧‧ voice coil drive (VCA)
12A‧‧‧線筒 12A‧‧‧Wire tube
12B‧‧‧永磁體 12B‧‧‧ permanent magnet
12C‧‧‧下端部 12C‧‧‧Bottom
13‧‧‧外殼 13‧‧‧Shell
14‧‧‧線筒支撐部 14‧‧‧Wire tube support
15‧‧‧鏡頭下端支撐部 15‧‧‧Lower end support
16‧‧‧底面 16‧‧‧ bottom
19‧‧‧彈簧 19‧‧‧ Spring
19A‧‧‧上彈簧 19A‧‧‧Up spring
19B‧‧‧下彈簧 19B‧‧‧ Lower spring
100‧‧‧使用者界面單元 100‧‧‧User Interface Unit
110‧‧‧控制單元 110‧‧‧Control unit
120‧‧‧存儲器 120‧‧‧ memory
130‧‧‧視頻信號處理單元 130‧‧‧Video Signal Processing Unit
140‧‧‧數位類比轉換器(DAC) 140‧‧‧Digital Analog Converter (DAC)
150‧‧‧馬達驅動單元 150‧‧‧Motor drive unit
165‧‧‧音圈馬達(VCM) 165‧‧‧ voice coil motor (VCM)
圖1為適用VCM的一般相機模組的剖面示意圖。 1 is a schematic cross-sectional view of a general camera module for a VCM.
圖2為用以使鏡頭進行初始驅動而對VCM施加的電流和鏡頭的變位圖表的示意圖。 2 is a schematic diagram of a displacement map of a current applied to a VCM and a lens for initial driving of the lens.
圖3為用以使鏡頭恢復到著地位置而對VCM施加的電流和鏡頭的變位圖表的示意圖。 Figure 3 is a schematic illustration of the current applied to the VCM and the displacement map of the lens to return the lens to the ground position.
圖4為示意性顯示根據本發明的實施例的VCM驅動控制裝置的方塊圖。 4 is a block diagram schematically showing a VCM drive control device according to an embodiment of the present invention.
圖5為根據本發明的實施例的VCM驅動控制流程示意圖。 FIG. 5 is a schematic diagram of a VCM drive control flow according to an embodiment of the present invention.
圖6a和圖6b為根據本發明的實施例的VCM施加電流和鏡頭的變位圖表的示意圖。 6a and 6b are schematic diagrams of a VCM applied current and a displacement map of a lens, in accordance with an embodiment of the present invention.
圖7為響應於相機操作命令直接對VCM施加電流的先前技術的電流施加定時的示意圖。 7 is a schematic diagram of prior art current application timing for applying current directly to a VCM in response to a camera operation command.
圖8為根據本發明的實施例的電流施加定時的示意圖。 FIG. 8 is a schematic diagram of current application timing in accordance with an embodiment of the present invention.
以下，參照圖式對本發明的較佳實施例進行詳細的說明。在對本發明的說明中，針對與本發明相關的公知功能或構成，例如相機模組的機構組成等公知構成省略詳細說明。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the description of the present invention, a known configuration or a configuration related to the present invention, for example, a known configuration of a camera module, and the like, will be omitted.
作為參考，下文中所用的術語無限位置(infinite position)被定義為在向相機模組供應操作電源時鏡頭從停放位置(parking position)移動而到達的初始驅動位置。在相關領域中通常將在使物體放在相機前方1米處後對焦的位置設定為無限位置。與此相反，停放位置被定義為在相機操作關閉時鏡頭存在的位置。另外，相機操作控制命令被定義為包括用於驅動相機的相機操作命令和用於停止相機驅動的關閉相機操作命令。當然，自動聚焦、放大、縮小命令也可以是相機操作控制命令之一。並且，鏡頭啟動電流值被定義為在鏡頭從停放位置啟動時對VCM施加的電流值。 For reference, the term infinite position as used hereinafter is defined as the initial driving position at which the lens moves from a parking position when supplying operating power to the camera module. In the related art, the position where the object is focused after being placed at 1 meter in front of the camera is usually set to an infinite position. In contrast, the parking position is defined as the position where the lens exists when the camera operation is turned off. In addition, the camera operation control command is defined to include a camera operation command for driving the camera and a close camera operation command for stopping the camera drive. Of course, the auto focus, zoom in, and zoom out commands can also be one of the camera operation control commands. Also, the lens start current value is defined as the current value applied to the VCM when the lens is activated from the park position.
首先，圖4為示意性顯示根據本發明的實施例的VCM驅動控制裝置的方塊圖。 First, FIG. 4 is a block diagram schematically showing a VCM drive control device according to an embodiment of the present invention.
參照圖4，用於控制驅動使相機模組的鏡頭移動的VCM165的裝置包括：控制單元110，根據使用者的相機操作控制命令產生並輸出用於使相機模組的鏡頭移動到無限位置或停放位置的VCM驅動 控制信號；數位類比轉換器(DAC)140，用於將前述VCM驅動控制信號轉換為模擬信號；及馬達驅動單元150，產生與轉換成模擬信號的前述VCM驅動控制信號對應的電流i(t)，並施加給VCM165。 Referring to FIG. 4, the apparatus for controlling the VCM 165 that drives the movement of the lens of the camera module includes: a control unit 110 that generates and outputs a lens for moving the camera module to an infinite position or parking according to a user's camera operation control command. a positional VCM drive control signal; a digital analog converter (DAC) 140 for converting the aforementioned VCM drive control signal into an analog signal; and a motor drive unit 150 for generating a current corresponding to the aforementioned VCM drive control signal converted into an analog signal i(t) is applied to VCM165.
前述控制單元110根據通過使用者界面單元100所輸入的使用者命令而控制安裝在如手機、數位相機等裝置的相機模組的整體操作。用於控制相機模組的整體操作的控制程式資料存儲於可存取的存儲器120。 The control unit 110 controls the overall operation of the camera module mounted on a device such as a mobile phone or a digital camera according to a user command input through the user interface unit 100. Control program data for controlling the overall operation of the camera module is stored in the accessible memory 120.
作為上述控制單元110的控制操作，舉一例，為了最小化VCM異音的產生，控制單元110響應於相機操作命令而產生並輸出用於對前述VCM165施加以第一斜率線性增加到預先設定的第一拐點(圖6a的P1)的電流的VCM驅動控制信號和用於對前述VCM165施加從前述第一拐點(圖6a的P1)起以小於前述第一斜率的第二斜率線性增加到無限位置的電流的VCM驅動控制信號。 As a control operation of the control unit 110, as an example, in order to minimize the generation of the VCM abnormal sound, the control unit 110 generates and outputs a linear increase to the preset value by applying the first slope to the VCM 165 in response to the camera operation command. a VCM drive control signal of a current at an inflection point (P1 of FIG. 6a) and a second slope that is applied to the aforementioned VCM 165 from the aforementioned first inflection point (P1 of FIG. 6a) to be smaller than the aforementioned first slope to linearly increase to an infinite position The VCM of the current drives the control signal.
並且，控制單元110響應於關閉相機操作命令而產生並輸出用於對前述VCM165施加以第三斜率線性減少到預先設定的第二拐點(圖6b的P2)的電流的VCM驅動控制信號和用於對前述VCM165施加從前述第二拐點P2以大於前述第三斜率的第四斜率線性減少到停放位置的電流的VCM驅動控制信號。 And, the control unit 110 generates and outputs a VCM drive control signal for applying a current for linearly reducing the third slope to a preset second inflection point (P2 of FIG. 6b) to the aforementioned VCM 165 in response to turning off the camera operation command and for A VCM driving control signal that linearly reduces the current from the aforementioned second inflection point P2 to the parking position by a fourth slope greater than the aforementioned third slope is applied to the aforementioned VCM 165.
作為參考，前述第一拐點P1和第二拐點P2可以分別被設定為在相機模組的鏡頭從停放位置啟動時對VCM165施加的電流值(通過實驗可以獲得)之前的值(在鏡頭著地時為上述電流值之後的值)(較佳設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值)，並在存儲器120或控制單元110的內部存儲器或暫存器中儲存使用。前述第一拐點P1及第二拐點P2 可以被設定為相同的電流值，但也可以根據各個相機模組的機構特性和操作特性而具有相互不同的電流值。尤其重要的是，由於重力、靜摩擦力等，根據相機模組的姿勢(朝上(face up)、水平(Horizontal)、朝下(face down))而鏡頭啟動電流也可變。從而，前述第一拐點P1及第二拐點P2可以與根據相機模組的姿勢而可變的鏡頭啟動電流值相應地被變更設定，且變更設定的各個前述第一拐點P1及前述第二拐點P2可以被設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值。 For reference, the aforementioned first inflection point P1 and second inflection point P2 may be respectively set to values before the current value applied to the VCM 165 (obtained by experiment) when the lens of the camera module is activated from the parking position (when the lens is grounded) a value after the current value) (preferably set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position), and is inside the memory 120 or the control unit 110 Stored in memory or scratchpad for use. The first inflection point P1 and the second inflection point P2 may be set to the same current value, but may have mutually different current values according to the mechanism characteristics and operational characteristics of the respective camera modules. It is particularly important that the lens starting current is also variable depending on the posture of the camera module (face up, horizontal, face down) due to gravity, static friction, and the like. Therefore, the first inflection point P1 and the second inflection point P2 may be changed and set in accordance with a lens activation current value that is variable according to a posture of the camera module, and each of the set first inflection point P1 and the second inflection point P2 may be changed. It can be set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position.
在圖4中未說明的使用者界面單元100根據設備包括用於輸入使用者命令的操作按鈕，且根據情況，還可包括用於顯示拍攝的圖像、設備操作狀態的顯示部。 The user interface unit 100 not illustrated in FIG. 4 includes an operation button for inputting a user command according to the device, and may further include a display portion for displaying the photographed image and the operation state of the device, as the case may be.
在存儲器120中存儲有用於控制驅動相機模組的控制程式資料，且還存儲有通過實驗獲得的前述第一拐點P1及第二拐點P2的資訊。 The control program data for controlling the driving of the camera module is stored in the memory 120, and the information of the first inflection point P1 and the second inflection point P2 obtained through experiments is also stored.
視頻信號處理單元130對從構成相機模組的圖像感測器獲得的視頻信號進行處理。圖像感測器通常被配置在相機模組的鏡頭下部。 The video signal processing unit 130 processes the video signals obtained from the image sensors constituting the camera module. Image sensors are typically placed in the lower portion of the lens of the camera module.
參照圖1對相機模組的機構構成進行補充說明。圖1顯示鏡頭移動到底面(停放位置)的VCA(Voice Coil Actuator；音圈驅動器)12的狀態。在圖1中，鏡頭驅動單元包括VCA12、彈簧19及外殼13。VCA12用來使鏡頭11沿著光軸直線移動以便調集，並由線筒12A和永磁體12B構成。線筒12A結合到鏡頭11的側面且纏繞有線圈(未圖示)。線筒12A根據對線圈施加的電流量調節鏡頭11的位置。永磁體12B被配置在線筒12A的外側。當相機模組10進行拍攝操作時，線筒12A的下端部12C與外殼13的線筒支撐部14隔開間隔h。 線筒12A的下端部12C與外殼13的線筒支撐部14之間的間隔h相同於鏡頭11的以下與底面16之間的間隔。彈簧19用來當相機電源關閉時使鏡頭11移動到底面16，並由配置在VCA12上部的上彈簧19A和配置在VCA12下部的下彈簧19B構成。外殼13用來通過包圍相機模組10內部的組件而保護和支撐前述組件，且包括線筒支撐部14及鏡頭下端支撐部15。鏡頭下端支撐部15的上面形成當相機電源關閉時與鏡頭11接觸的底面16。在上述相機模組構成中，為了便於說明，將使鏡頭11移動的VCA12統一稱為VCM165，且將底面16稱為停放位置。 A supplementary description will be given of the mechanism configuration of the camera module with reference to FIG. Fig. 1 shows the state of a VCA (Voice Coil Actuator) 12 in which the lens is moved to the bottom surface (parking position). In FIG. 1, the lens driving unit includes a VCA 12, a spring 19, and a casing 13. The VCA 12 is used to linearly move the lens 11 along the optical axis for mobilization, and is composed of a bobbin 12A and a permanent magnet 12B. The bobbin 12A is coupled to the side of the lens 11 and is wound with a coil (not shown). The bobbin 12A adjusts the position of the lens 11 in accordance with the amount of current applied to the coil. The permanent magnet 12B is disposed outside the wire barrel 12A. When the camera module 10 performs a photographing operation, the lower end portion 12C of the bobbin 12A is spaced apart from the bobbin support portion 14 of the outer casing 13 by a space h. The interval h between the lower end portion 12C of the bobbin 12A and the bobbin support portion 14 of the outer casing 13 is the same as the interval between the lower surface of the lens 11 and the bottom surface 16. The spring 19 is used to move the lens 11 to the bottom surface 16 when the camera power is turned off, and is constituted by an upper spring 19A disposed at an upper portion of the VCA 12 and a lower spring 19B disposed at a lower portion of the VCA 12. The outer casing 13 serves to protect and support the aforementioned components by surrounding components of the camera module 10, and includes a bobbin support portion 14 and a lens lower end support portion 15. The upper surface of the lens lower end support portion 15 forms a bottom surface 16 that is in contact with the lens 11 when the camera power is turned off. In the above-described configuration of the camera module, for convenience of explanation, the VCA 12 that moves the lens 11 is collectively referred to as a VCM 165, and the bottom surface 16 is referred to as a parking position.
以下，參照圖式對具有上述構成的VCM驅動控制裝置的操作進行更詳細的說明。 Hereinafter, the operation of the VCM drive control device having the above configuration will be described in more detail with reference to the drawings.
圖5示意性顯示根據本發明的實施例的VCM驅動控制流程圖，圖6a和圖6b分別顯示根據本發明的實施例的VCM施加電流和鏡頭的變位圖表。以下，為了便於說明，假設相機模組的姿勢處於水平(Horizontal)狀態說明本發明的實施例，且對通過利用在水平狀態獲得的鏡頭啟動電流值和映射到在水平狀態獲得的鏡頭啟動電流值的第一拐點P1和第二拐點P2來控制驅動VCM165的方法進行說明。 Fig. 5 schematically shows a VCM drive control flow chart according to an embodiment of the present invention, and Figs. 6a and 6b respectively show a VCM applied current and a displacement map of the lens according to an embodiment of the present invention. Hereinafter, for convenience of explanation, it is assumed that the posture of the camera module is in a horizontal state to explain an embodiment of the present invention, and to activate a current value by using a lens obtained in a horizontal state and to map a lens starting current value obtained in a horizontal state. The first inflection point P1 and the second inflection point P2 are used to control the method of driving the VCM 165 for explanation.
參照圖5，首先在相機的操作電源關閉的狀態下相機模組的鏡頭11位於底面16，亦即停放位置。如果通過使用者界面單元100接收相機操作命令(步驟S10)，控制單元110就將鏡頭11移動到初始驅動位置即無限位置。 Referring to FIG. 5, first, the lens 11 of the camera module is located on the bottom surface 16, that is, the parking position, in a state where the operating power of the camera is turned off. If the camera operation command is received through the user interface unit 100 (step S10), the control unit 110 moves the lens 11 to the initial driving position, that is, the infinite position.
為此，如圖6a所示，控制單元110對VCM165施加以第一斜率線性增加到預先設定的第一拐點P1(步驟S20)。前述第一拐點P1被設定為在鏡頭11通過施加電流從停放位置啟動時的電流值(鏡頭 啟動電流值，通過實驗可以獲得)之前的值(較佳設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值)。作為參考，前述第一拐點P1具有與對VCM165施加的電流值對應的數位值，以下為了便於說明將其稱為電流值(current)。 To this end, as shown in FIG. 6a, the control unit 110 applies a linear increase to the VCM 165 with a first slope to a preset first inflection point P1 (step S20). The aforementioned first inflection point P1 is set to a value before the lens 11 is obtained by applying a current from the parking position (the lens starting current value, which can be obtained by experiment) (preferably set to make the lens in an infinite position) The current value of the VCM applied is 25% or more and 50% or less of the current value). For reference, the aforementioned first inflection point P1 has a digit value corresponding to a current value applied to the VCM 165, which is hereinafter referred to as a current value for convenience of explanation.
將前述第一拐點P1設定為鏡頭啟動電流值之前的值的理由是為了縮短使鏡頭初始驅動並移動到無限位置所需的時間，且最小化VCM異音。即，如圖6a所示，當像現有線性控制方式的斜率(亦即LSC(Linear Slope Control)；線性斜率控制)一樣以1代碼步驟單位線性增加VCM施加電流時，雖然VCM異音降低，但使鏡頭移動到無限位置所需的時間延長。對此，在本發明中，採用將施加電流急劇線性增加到水平狀態的鏡頭啟動電流之前的第一拐點P1(例如，5代碼步驟單位)(LSC1)的方式縮短鏡頭的初始驅動時間。 The reason for setting the aforementioned first inflection point P1 to the value before the lens start current value is to shorten the time required to initially drive the lens and move to the infinite position, and to minimize the VCM abnormal sound. That is, as shown in FIG. 6a, when the VCM applied current is linearly increased by one code step unit like the slope of the existing linear control mode (ie, LSC (Linear Slope Control); linear slope control), although the VCM abnormal sound is lowered, The time required to move the lens to an infinite position is extended. In contrast, in the present invention, the initial driving time of the lens is shortened in such a manner that the first inflection point P1 (for example, 5 code step units) (LSC1) before the lens start current is linearly increased to the horizontal state by the linear increase of the applied current.
如上前述，在控制對VCM165施加以第一斜率線性增加到第一拐點P1的電流之後，控制單元110對VCM165施加從前述第一拐點P1以小於前述第一斜率的第二斜率線性增加到無限位置的電流(步驟S30)，以便使鏡頭移動到初始驅動位置即無限位置。以前述第二斜率線性增加的電流i(t)應被設定為包括鏡頭啟動電流值，並應被設定為具有線性增加以使VCM異音最小化的斜率。 As described above, after controlling the application of the current applied to the VCM 165 linearly increasing to the first inflection point P1 with the first slope, the control unit 110 applies a linear increase from the aforementioned first inflection point P1 to the infinite position from the second slope smaller than the aforementioned first slope to the VCM 165. The current (step S30) is to move the lens to the initial driving position, that is, the infinite position. The current i(t) that increases linearly with the aforementioned second slope should be set to include the lens start current value and should be set to have a slope that increases linearly to minimize VCM noise.
如上前述，若控制對VCM165施加以相對大的第一斜率線性增加到與鏡頭啟動電流值接近的在鏡頭啟動電流值之前的電流值(第一拐點P1)的電流，且控制對VCM165施加從前述第一拐點P1以小於前述第一斜率的第二斜率線性增加到無限位置的電流，則如圖6a所示可以將使鏡頭移動到無限位置所需的時間從以往的T2縮短到T1，且通過施加緩慢地線性增加的電流而能夠最小化VCM異音。 As described above, if the control is applied to the VCM 165, the current of the current value (the first inflection point P1) before the lens start current value which is linearly increased to the lens start current value is linearly increased with a relatively large first slope, and the control applies to the VCM 165 from the foregoing. The first inflection point P1 linearly increases to a current at an infinite position with a second slope smaller than the aforementioned first slope, and the time required to move the lens to the infinite position can be shortened from the previous T2 to T1 as shown in FIG. 6a, and A slowly linearly increasing current is applied to minimize VCM abnormal sound.
另外，在相機操作中通過使用者接收關閉相機操作命令(步驟S40)時，控制單元110響應於關閉相機操作命令而如圖6b所示控制對VCM165施加以第三斜率線性減少(以1代碼步驟單位)到預先設定的第二拐點P2的電流(步驟S50)。前述第二拐點P2可以具有相同於前述第一拐點P1的電流值，也可以具有不同於前述第一拐點P1的電流值，並具有小於鏡頭啟動電流值的電流值即在鏡頭啟動電流值之前的電流值。這也是通過試驗可以獲得的值。尤其重要的是，前述第一拐點P1和第二拐點P2為了最小化由於鏡頭啟動電流值產生的VCM異音，應被設定為小於鏡頭啟動電流值的電流值即在鏡頭啟動電流值之前的電流值(較佳設定為用以使鏡頭位於無限位置而對VCM施加的電流值的25%以上且50%以下的電流值)。 In addition, when receiving the camera operation command by the user in the camera operation (step S40), the control unit 110 controls the VCM 165 to apply a linear decrease in the third slope as shown in FIG. 6b in response to the camera operation command being turned off (in 1 code step). The unit is current to the preset second inflection point P2 (step S50). The second inflection point P2 may have the same current value as the first inflection point P1, or may have a current value different from the first inflection point P1, and have a current value smaller than the lens starting current value, that is, before the lens starting current value. Current value. This is also the value that can be obtained by experimentation. It is particularly important that the aforementioned first inflection point P1 and second inflection point P2 are set to be smaller than the lens starting current value, that is, the current before the lens starting current value, in order to minimize the VCM abnormal sound generated due to the lens starting current value. The value (preferably set to a current value of 25% or more and 50% or less of a current value applied to the VCM for the lens to be in an infinite position).
如上前述，在控制對VCM165施加以第三斜率緩慢線性減少到第二拐點P2的電流之後，如圖6b所示，控制單元110控制對VCM165施加從前述第二拐點P2以大於前述第三斜率的第四斜率線性減少(以5代碼步驟單位)到停放位置的電流(步驟S60)，以使鏡頭停放。 As described above, after controlling to apply a current that is slowly linearly reduced to the second inflection point P2 with the third slope to the VCM 165, as shown in FIG. 6b, the control unit 110 controls the application of the VCM 165 from the aforementioned second inflection point P2 to be greater than the aforementioned third slope. The fourth slope linearly reduces (in units of 5 code steps) the current to the park position (step S60) to park the lens.
如上前述，通過控制對VCM165施加以相對小的斜率線性減少到與鏡頭啟動電流值接近的電流值(第三拐點P3)的電流來最小化VCM異音，且通過控制對VCM165施加從前述第二拐點P2以大於前述第三斜率的第四斜率線性減少到停放位置的電流來可以將使鏡頭移動到停放位置所需的時間從以往LSC的T4縮短到T3。 As described above, the VCM abnormal sound is minimized by controlling the current applied to the VCM 165 to linearly decrease to a current value (third inflection point P3) close to the lens starting current value with a relatively small slope, and the second is applied from the aforementioned VCM 165 by control. The inflection point P2 linearly reduces the current to the parking position by a fourth slope greater than the aforementioned third slope to shorten the time required to move the lens to the parking position from T4 of the previous LSC to T3.
另外，若控制對VCM165施加從第二拐點P2線性減少到停放位置的電流，則可以降低由於在不是通過逐漸減少施加電流而是直接關閉電源時會發生的鏡頭和底面的碰撞造成的噪音。 In addition, if the control applies a current that linearly decreases from the second inflection point P2 to the parking position to the VCM 165, it is possible to reduce the noise due to the collision of the lens and the bottom surface which may occur when the power is not directly turned off by gradually reducing the applied current.
圖7顯示響應於相機操作命令而直接對VCM施加電流的先前技術的電流施加定時，而表1示意性顯示基於圖7的噪音測量試驗結果。另外，圖8顯示根據本發明的實施例的電流施加定時，而表2示意性顯示基於圖8的噪音測量試驗結果。 FIG. 7 shows the prior art current application timing of applying current directly to the VCM in response to a camera operation command, and Table 1 schematically shows the noise measurement test result based on FIG. In addition, FIG. 8 shows current application timing according to an embodiment of the present invention, and Table 2 schematically shows noise measurement test results based on FIG.
圖8與圖7相比，圖8顯示以如下方式控制的電流施加定時圖：響應於相機操作命令而不是像圖7那樣採用直接對VCM施加電流的方式，而是採用電流以第一斜率急劇線性增加到通過試驗獲得的第一拐點P1的方式對VCM施加電流，且採用電流從前述第一拐點P1以第二斜率線性增加到無限位置的方式對VCM施加電流，且前述第二斜率小於第一斜率。 8 is compared with FIG. 7, which shows a current application timing diagram controlled in such a manner that instead of applying a direct current to the VCM as in FIG. 7, in response to a camera operation command, the current is sharply measured with a first slope. Applying a current to the VCM linearly increasing to the first inflection point P1 obtained by the test, and applying a current to the VCM in such a manner that the current linearly increases from the first inflection point P1 to the infinite position with the second slope, and the aforementioned second slope is smaller than the first A slope.
表1和表2示意性顯示當以如圖7和圖8所示的方式對VCM施加電流時測量VCM異音的結果。在對比表1和表2時，可見在根據本發明的實施例控制驅動VCM時的VCM異音與在以直接方式控制時的VCM異音相比相對降低。 Tables 1 and 2 schematically show the results of measuring VCM abnormal sounds when current is applied to the VCM in the manner as shown in Figs. 7 and 8. When comparing Tables 1 and 2, it can be seen that the VCM abnormal sound when controlling the driving of the VCM according to the embodiment of the present invention is relatively lowered as compared with the VCM abnormal sound when controlled in the direct mode.
因此，根據本發明，與以直接方式對VCM施加電流的方法相比能夠降低VCM異音，且與響應於相機操作命令而對VCM施加逐漸線性增加的電流的現有方法相比，可以縮短使鏡頭移動到無限位置所需的時間，因而是一個非常有用的發明。 Therefore, according to the present invention, VCM abnormal sound can be reduced as compared with a method of applying current to the VCM in a direct manner, and the lens can be shortened as compared with the prior art method of applying a gradually linearly increasing current to the VCM in response to a camera operation command. The time required to move to an infinite position is therefore a very useful invention.
以上已對本發明圖式中顯示的一實施例進行了說明，但這僅僅是作為例示，只要是所屬技術領域中具有通常知識者，都能理解通過這些來進行多種變形及均等的其他實施例。因此，本發明的真正的保護範圍應通過申請專利範圍來確定。 The embodiment shown in the drawings has been described above, but this is merely an exemplification, and other embodiments that can be variously modified and equivalent can be understood by those skilled in the art. Therefore, the true scope of protection of the present invention should be determined by the scope of the patent application.
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| TWI677181B (en) * | 2018-11-08 | 2019-11-11 | 財團法人工業技術研究院 | Driving device for multi-axis common-mode voice coil motor |
| CN114362633A (en) * | 2022-03-11 | 2022-04-15 | 浙江芯昇电子技术有限公司 | Voice coil motor driving method and device used for same |
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| TWI699087B (en) | 2019-12-13 | 2020-07-11 | 點晶科技股份有限公司 | Voice coil motor driving device and control signal providing method |
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| JP2011250539A (en) * | 2010-05-25 | 2011-12-08 | On Semiconductor Trading Ltd | Drive control circuit and focus control circuit |
| JP5778925B2 (en) * | 2010-12-24 | 2015-09-16 | セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー | Motor drive circuit |
| JP5259851B1 (en) * | 2012-03-28 | 2013-08-07 | オリンパス株式会社 | Position control device |
| EP2851725B1 (en) * | 2012-05-17 | 2017-02-08 | Asahi Kasei Microdevices Corporation | Controller of linear motion device and control method of the same |
| JP6385076B2 (en) * | 2014-03-04 | 2018-09-05 | ローム株式会社 | Voice coil motor drive circuit, lens module and electronic device using the same, and voice coil motor drive method |
| TWI524654B (en) * | 2014-05-27 | 2016-03-01 | 立錡科技股份有限公司 | Driving signal generator and method of generating driving signal |
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| TWI677181B (en) * | 2018-11-08 | 2019-11-11 | 財團法人工業技術研究院 | Driving device for multi-axis common-mode voice coil motor |
| US10560045B1 (en) | 2018-11-08 | 2020-02-11 | Industrial Technology Research Institute | Driving device for multi-axis common-mode voice coil motor |
| CN114362633A (en) * | 2022-03-11 | 2022-04-15 | 浙江芯昇电子技术有限公司 | Voice coil motor driving method and device used for same |
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