WO2016000533A1 - 一种快速对焦的手机摄像模组 - Google Patents

一种快速对焦的手机摄像模组 Download PDF

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Publication number
WO2016000533A1
WO2016000533A1 PCT/CN2015/081775 CN2015081775W WO2016000533A1 WO 2016000533 A1 WO2016000533 A1 WO 2016000533A1 CN 2015081775 W CN2015081775 W CN 2015081775W WO 2016000533 A1 WO2016000533 A1 WO 2016000533A1
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lens
focusing
mobile phone
processing unit
focus motor
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PCT/CN2015/081775
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English (en)
French (fr)
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钞晨
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深圳市世尊科技有限公司
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Publication of WO2016000533A1 publication Critical patent/WO2016000533A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method

Definitions

  • the invention relates to a camera module, and in particular to a camera module for fast focusing of a mobile phone.
  • smart phones use the traditional passive contrast method to focus, that is, directly receive and analyze the scene image, and find the best focus lens position by comparing the contrast of different lens position images.
  • Focus mode The advantage is that it does not need to launch the system itself, so it consumes less energy and is advantageous for miniaturization, so it can be applied to portable mobile terminals such as smart phones.
  • the conventional focusing method is capable of autofocusing, it does not achieve good focus when the ambient light is weak, or the brightness contrast is low, and the focus is on a thin line, polarized, black, or mirrored subject.
  • the focus speed is quite slow, because the principle of the contrast method determines that it must rely on the differential method to successively approach the lens to find the best focus position of the lens. It takes a lot of time to move the lens multiple times. However, people have certain requirements for the focusing time in the actual shooting process. If the focusing time is too long, they often miss the wonderful moment and cause regret.
  • the present invention provides a fast focus mobile phone camera module, which integrates a micro processing unit, a lens, a focus motor for driving the lens motion, and an image.
  • the sensor and other components, the distance measuring sensor measures the distance of the measured object, and then the micro processing unit calculates the focus position of the lens through the data of the distance measuring sensor, and controls the focus motor to drive the lens to the focus position for focusing, because the invention is in the mobile phone camera mode
  • the micro-processing unit is separately configured in the group, so that the mobile phone camera module does not occupy the system resources of the mobile phone, so the focusing speed of the mobile phone camera module can be greatly improved, thereby realizing the functions of capturing and moving objects, and these functions are all before Only professional cameras can be implemented.
  • the invention greatly improves the integration degree of the mobile phone camera module. Since the distance measuring sensor and the lens are integrated on one module board, the distance between the two can be minimized, and the distance measuring sensor is minimized when the camera is taken. The chance of occlusion.
  • the present invention does not need to perform image processing operations, which is one of the reasons for achieving the extremely fast focusing of the present invention, and further eliminates the need to occupy system resources.
  • the invention Compared with other camera phones with discrete ranging modules, the invention has higher integration degree, smaller volume, and the distance between the distance measuring sensor and the camera is the smallest. Therefore, the invention minimizes the active mode.
  • the volume of the focus camera module promotes the development of miniaturization of electronic devices.
  • the present invention can be applied to various mobile phones with different thickness and width, and has wide application prospects.
  • the present invention can achieve the object of the present invention by using different focus motors and different ranging sensors as needed.
  • Figure 1 is a schematic diagram of a first embodiment of the present invention
  • Figure 2 is a schematic diagram of a second embodiment of the present invention.
  • Figure 3 is a schematic diagram of a third embodiment of the present invention.
  • the invention is mainly composed of three core components: a camera system, including an image sensor, a focus motor and a lens.
  • the camera system can adjust and change the position of the lens by using a focus motor under the control of the micro processing unit to achieve focusing and the like.
  • Ranging sensor the sensing distance is in the range of several centimeters to several meters, covering the range of near focus and far focus of the lens; the micro processing unit ( MCU), the micro processing unit can calculate the shooting distance between the object and the lens through the ranging sensor.
  • MCU micro processing unit
  • the built-in shooting distance is a function of the position of the focus lens, so the exact focus position of the corresponding lens can be obtained according to the distance measuring sensor.
  • MCU The focus motor is then controlled to raise the lens to the focus position for active extreme focus.
  • Figure 1 shows a first embodiment of the present invention, in which the focus motor uses an open-loop autofocus motor,
  • the micro processing unit controls the ranging sensor to emit an optical pulse signal or an ultrasonic pulse signal, and the signals are reflected back by the measured object, and then the ranging sensor receives the pulse signals, and the micro processing unit can analyze and calculate the lens according to the two pulse signals.
  • the microprocessor unit uses the basic characteristics of the focus motor, that is, the relationship between the current and the stroke position, to apply an appropriate amount of current to the open-loop autofocus motor, and raise the lens in one step to the position of the image sensor for precise focus. Due to the spring-loaded structure of the open-loop autofocus motor, the lens is easily vibrated at its equilibrium position after extreme speed movement, resulting in image blurring, so the microprocessor unit can have built-in intelligent step control ( The ISRC algorithm, based on the resonant frequency and Q value of the open-loop autofocus motor itself, selects the appropriate moving step to control the motor to move into position, minimizing the effects of resonance and increasing the focusing speed.
  • the ISRC algorithm based on the resonant frequency and Q value of the open-loop autofocus motor itself, selects the appropriate moving step to control the motor to move into position, minimizing the effects of resonance and increasing the focusing speed.
  • FIG. 2 A second embodiment of the present invention is shown.
  • the focus motor uses a closed loop focus motor
  • the closed loop focus motor has a built-in Hall sensor
  • the position signal of the lens is sent to the micro processing unit
  • the micro processing unit utilizes a closed loop. Control the movement of the lens.
  • the closed-loop control method of the second embodiment can effectively avoid lens shift phenomenon caused by factors such as lens resonance and posture difference, and can obtain faster and more accurate focusing.
  • the focus motor uses a multi-axis focus motor
  • the micro processing unit is electrically connected to a gyroscope for detecting the hand shake of the photographer.
  • the gyroscope can be integrated with components such as a micro processing unit.
  • the micro processing unit can also establish instant communication with the gyroscope outside the module, and the micro processing unit obtains the information of the photographer's hand shake by receiving the signal of the gyroscope, and then according to the built-in
  • the OIS algorithm controls the multi-axis focus motor to drive the lens to shift in the X and Y directions, eliminating image instability caused by hand vibration, and enabling the mobile camera module to implement optical anti-shake (OIS).
  • OIS optical anti-shake
  • the ranging sensor can be selected as an ultrasonic probe or a photoelectric probe, and those skilled in the art can select other probes as needed.
  • the micro-processing unit sends a pulse signal to the ultrasonic probe, and the ultrasonic probe excites the ultrasonic probe to emit a pulse-resonant ultrasonic wave.
  • the pulse-resonant ultrasonic wave is reflected by the object, it is received by the ultrasonic probe, and the micro-processing unit can According to the time difference between the two resonant ultrasonic waves, combined with the velocity of the resonant ultrasonic wave in the air, the distance of the object can be calculated.
  • the photoelectric probe includes an infrared focusing LED and an infrared photodiode.
  • the micro processing unit first controls the infrared focusing LED to emit high frequency modulated infrared light, and the modulation frequency needs to be 10MHz to 20MHz Left and right, this high-frequency modulated infrared light is reflected by the infrared photodiode after being reflected by the object, and is converted into a high-frequency electric signal of the same frequency.
  • the high frequency electrical signal and the transmitted high frequency modulated infrared light signal are phase shifted in phase, and the phase shift amount is proportional to the distance of the object.
  • the micro processing unit can calculate the exact position of the object according to the phase of the compared high frequency modulated infrared light signal and the received high frequency electrical signal.
  • the invention integrates the ranging sensor into the camera module of the mobile phone, and carries various different focusing motors to realize the extreme speed focusing of the mobile phone camera, so as to meet the needs of people to capture and grab.

Abstract

本发明公开了一种快速对焦的手机摄像模组，包括微处理单元、镜头、驱动镜头运动的对焦马达、一测距传感器，所述微处理单元获取测距传感器的信号，计算得出镜头的对焦位置，并控制对焦马达带动镜头移动至对焦位置进行对焦。本发明不占用手机系统资源，可以精确得出镜头的对焦位置，实现手机的极速对焦。

Description

一种快速对焦的手机摄像模组 技术领域
本发明涉及摄像模组，尤其涉及一种用于手机的快速对焦的摄像模组。
背景技术
人们在拍摄照片时都希望能够抓拍精彩美好的瞬间，目前只有专业的相机才配备对焦速度较快的摄像模组，而现有的智能手机的对焦速度一直跟不上，因此，如何提高手机拍照的自动对焦速度一直是该领域技术人员的首要课题。
目前智能手机采用传统的被动式的对比度法进行对焦，即直接接收分析景物图像，通过对比不同镜头位置图像的对比度而找出最佳对焦镜头位置的自动对焦方法 . 这种自动 对焦方式 的优点是：自身不要发射系统，因而耗能少，有利于小型化，因此可以应用在智能手机等便携式移动终端上。该传统的对焦方式虽然能够进行自动对焦，但是，在周围环境光线较弱，或者亮度反差低的情况下不能实现良好对焦，对细线条的、含偏光的、黑色或镜面的被摄物体也对焦较困难，并且即便是在光线环境不错的情况下，对焦速度也相当慢，因为对比度法的原理决定了它必须依靠多次移动镜头后利用差值法逐次逼近才能找到镜头最佳对焦位置，而多次移动镜头需要耗费很多时间，然而人们在实际的拍摄过程中对于对焦时间又有一定的要求，若对焦时间过长，往往就错过了精彩的瞬间，造成遗憾。
发明内容
本发明为了解决上述现有技术中手机对焦速度慢的技术问题，提出一种快速对焦的手机摄像模组，该手机摄像模组内集成了微处理单元、镜头、驱动镜头运动的对焦马达、图像传感器等部件，测距传感器测量被测物体的距离，然后微处理单元通过测距传感器的数据计算出镜头的对焦位置，控制对焦马达带动镜头运动至对焦位置进行对焦，由于本发明在手机摄像模组内单独配置了微处理单元，使得手机摄像模组不占用手机的系统资源，因此可以大大提高手机摄像模组的对焦速度，从而实现抓拍、移动物体的追拍等功能，而这些功能之前都只有专业相机才可以实现。
本发明大大提高了手机摄像模组的集成度，由于测距传感器和镜头都集成在一块模组板上，使得两者的距离可以达到最小，实现了最大程度上降低拍照时测距传感器被手遮挡的几率。
本发明与目前其他测距对焦技术相比，如双摄像头测距技术，本发明无需进行图像处理运算，这也是本发明实现极速对焦的原因之一，而且更加不需要占用系统资源。本发明与其他带分立式测距模块的拍照手机相比，本发明的集成度更高，体积更小，测距传感器和摄像头的距离最小，因此，本发明在最大程度上减少了主动式对焦摄像模组的体积，促进了电子设备的小型化发展需求，本发明可以应用在各种薄厚不同，宽窄不同的手机上，应用前景非常广泛。
在本发明的技术方案中，微处理器接收测距传感器传送的信号，根据公式 1/u+1/v=1/f 计算出镜头与测距传感器的距离，控制镜头移动至测距传感器的位置进行对焦，其中， u 为被摄物体与测距传感器之间的距离， v 为镜头与测距传感器之间的距离， f 为镜头的有效焦距。本发明可以根据需要采用不同的对焦马达、不同的测距传感器来实现本发明的目的。
附图说明
图 1 是本发明的第一实施例原理图；
图 2 是本发明的第二实施例原理图；
图 3 是本发明的第三实施例原理图。
具体实施方式
下面结合符合详细描述本发明的具体实施例，以下的具体实施例仅用以举例说明本发明的构思，本领域的普通技术人员在本发明的构思下可以做出多种变形和变化，这些变形和变化均包括在本发明的保护范围之内。
本发明主要由三个核心部件构成：摄像头系统，包括图像传感器、对焦马达及镜头等部件，该摄像头系统可以在微处理单元的控制下利用对焦马达调整、改变镜头的位置，以实现对焦等功能；测距传感器，其感测距离为数厘米到几米远的范围，正好覆盖镜头的近焦和远焦的范围；微处理单元（ MCU ），该微处理单元可以通过测距传感器计算出被摄物体与镜头之间的拍摄距离。 MCU 内置了拍摄距离与对焦镜头位置的函数关系，因此根据测距传感器可获得相应镜头的准确对焦位置。 MCU 紧接着控制对焦马达将镜头抬升至该对焦位置，实现主动式极速对焦。
图 1 示出了本发明的第一实施例，在该实施例中，对焦马达采用开环式自动对焦马达， 微处理单元控制测距传感器发出光脉冲信号或者超声波脉冲信号，这些信号遇到被测物体被反射回来，然后测距传感器再接收这些脉冲信号，微处理单元根据两次脉冲信号可以分析计算出镜头与被摄物体之间的距离。然后根据公式 1/u + 1/v = 1/f 计算出镜头距离图像传感器的位置，该公式中， u 为镜头与被摄物体的距离， v 为镜头与图像传感器的距离， f 为镜头 4 的有效焦距。然后微处理单元然后利用对焦马达的基本特性，即电流与行程位置的关系，给开环式自动对焦马达通适当大小的电流，将镜头一步到位抬起到图像传感器的位置，实现精确对焦。由于开环式自动对焦马达的弹簧振子结构会使得镜头在极速移动后容易在其平衡位置发生振动，造成图像模糊，因此微处理单元可以内置智能步速控制（ ISRC ）算法，根据开环式自动对焦马达自身的共振频率和 Q 值，选择合适的移动步速来控制马达移动到位，最大程度上减轻共振的影响，提高对焦速度。
图 2 示出了本发明的第二实施例，在该实施例中，对焦马达采用闭环式对焦马达，闭环式对焦马达内置霍尔传感器，将镜头的位置信号发送给微处理单元，微处理单元利用闭环控制镜头的移动。第二实施例的闭环控制方法可有效避免镜头共振、姿态差等因素造成的镜头移位现象，可获得更快速精准的对焦。
图 3 示出了本发明的第三实施例，对焦马达采用多轴对焦马达，微处理单元与一用于检测拍摄者手部抖动的陀螺仪电连接，该陀螺仪可以与微处理单元等部件一起集成在模组内，也可以让微处理单元与模组外部的陀螺仪建立即时的通讯，微处理单元通过接收陀螺仪的信号获得拍摄者手抖的信息，然后根据内置的 OIS 算法控制多轴对焦马达带动镜头进行 X 和 Y 方向上的平移，消除手振造成的图像不稳定，使得手机摄像模组实现光学防抖（ OIS ）功能。
在上述三个具体实施例当中，采用的测距传感器，可以选择超声波探头或者是光电式探头，业内技术人员也可以根据需要来选择其他探头。采用超声波探头时，微处理单元会发出一个脉冲信号给超声波探头，激励超声波探头发出脉冲共振超声波，脉冲共振超声波遇到被摄物体时被反射回来，再被该超声波探头所接收，微处理单元可以根据两次共振超声波的时间差，结合共振超声波在空气中的速度，便可计算出被摄物体的距离。若采用光电式探头，该光电式探头包括一个红外聚焦发光二极管和一颗红外光电二极管。微处理单元首先控制红外聚焦发光二极管发出高频调制红外光，调制频率需在 10MHz 到 20MHz 左右，这种高频调制红外光遇到被摄物体反射后为红外光电二极管所接收，并转为同样频率的高频电信号。该高频电信号与发射的高频调制红外光信号在相位上会发生相移，相移量与被摄物体的距离成正比。微处理单元根据比较发射的高频调制红外光信号与接收的高频电信号的相位，可计算出被摄物体的准确位置。
本发明将测距传感器集成在手机摄像模组内，并搭载各种不同的对焦马达，实现手机摄像头的极速对焦，满足人们进行抓拍、抢拍的需求。

Claims (8)

  1. 一种快速对焦的手机摄像模组，包括微处理单元、图像传感器、镜头、驱动镜头运动的对焦马达，其特征在于：还包括一测距传感器，所述微处理单元获取测距传感器的信号，计算得出镜头的对焦位置，并控制对焦马达带动镜头移动至对焦位置进行对焦。
  2. 如权利要求 1 所述的快速对焦的手机摄像模组，其特征在于：所述微处理器接收测距传感器传送的信号，根据公式 1/u+1/v=1/f 计算出镜头与图像传感器的距离，控制镜头移动至图像传感器的位置进行对焦，其中， u 为被摄物体与测距传感器之间的距离， v 为镜头与图像传感器之间的距离， f 为镜头的有效焦距。
  3. 如权利要求 2 所述的快速对焦的手机摄像模组，其特征在于：所述对焦马达为开环式自动对焦马达，所述微处理器根据开环式自动对焦马达自身的共振频率和 Q 值，控制马达的移动。
  4. 如权利要求 2 所述的快速对焦的手机摄像模组，其特征在于：所述对焦马达采用闭环式对焦马达，所述闭环式对焦马达内置霍尔传感器，将镜头的位置信号发送给微处理单元，微处理单元利用闭环控制镜头的移动。
  5. 如权利要求 2 所述的快速对焦的手机摄像模组，其特征在于：所述对焦马达采用多轴对焦马达，所述微处理单元与一用于检测抖动的陀螺仪电连接，微处理单元接收陀螺仪的信号，根据防抖算法控制多轴对焦马达带动镜头进行移动，消除抖动造成的图像不稳定。
  6. 如权利要求 3 至 5 任意一项所述的快速对焦的手机摄像模组，其特征在于：所述测距传感器采用超声波探头，所述微处理单元根据超声波探头发出的共振超声波，以及超声波探头接收到的被反射的共振超声波之间的时间差，计算出被摄物体的距离。
  7. 如权利要求 3 至 5 任意一项所述的快速对焦的手机摄像模组，其特征在于：所述测距传感器采用光电式探头，所述光电式探头包括红外聚焦发光二极管和红外光电二极管，所述微处理单元根据红外聚焦发光二极管发出高频调制红外光，以及红外光电二极管接收到的被被摄物体反射回来的高频调制红外光之间的相移，计算出被摄物体的距离。
  8. 如权利要求 7 所述的快速对焦的手机摄像模组，其特征在于：所述高频调制红外光的调制频率范围为 10MHz~20MHz 。
PCT/CN2015/081775 2014-07-03 2015-06-18 一种快速对焦的手机摄像模组 WO2016000533A1 (zh)

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