WO2012034443A1 - 具有自动对焦驱动电路的移动终端及其驱动电路 - Google Patents

具有自动对焦驱动电路的移动终端及其驱动电路 Download PDF

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Publication number
WO2012034443A1
WO2012034443A1 PCT/CN2011/076844 CN2011076844W WO2012034443A1 WO 2012034443 A1 WO2012034443 A1 WO 2012034443A1 CN 2011076844 W CN2011076844 W CN 2011076844W WO 2012034443 A1 WO2012034443 A1 WO 2012034443A1
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WIPO (PCT)
Prior art keywords
mobile terminal
operational amplifier
resistor
triode
drive circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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PCT/CN2011/076844
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English (en)
French (fr)
Inventor
顾建良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Publication of WO2012034443A1 publication Critical patent/WO2012034443A1/zh
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10Power-operated focusing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50Constructional details
    • H04N23/54Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0053Driving means for the movement of one or more optical element
    • G03B2205/0069Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils

Definitions

  • the present invention relates to the field of focusing technology of a mobile terminal camera, and more particularly to a mobile terminal having an autofocus driving circuit and a driving circuit thereof.
  • the camera has become a regular accessory for mobile terminals.
  • a high-resolution camera will be deployed when producing mobile phones.
  • the camera When the camera is over 2 megapixels, it usually has an AF-auto focus device, so that the picture taken by the camera is clear.
  • the autofocus device (currently used to integrate a voice coil motor inside the camera) adjusts the focal length of the lens at the front of the camera to achieve a change in focus to achieve a clear image.
  • the focal length of the control camera is achieved by controlling the current flowing through the voice coil motor, and the magnitude of the current determines the angle at which the voice coil motor rotates, thereby achieving focusing.
  • a drive circuit is usually required to control the current.
  • a dedicated IC chip is used to implement the I 2 C interface of the IC chip and the mobile phone.
  • the baseband chip interface is connected, and a DAC module (digital to analog converter) needs to be configured inside the chip.
  • the use of this driver IC has the following two disadvantages: First, because the DAC module needs to be configured inside the IC, the price of the chip is relatively high; Second, the interface between the chip and the mobile phone baseband chip is an I 2 C interface, due to I 2 C interface is a serial interface, it has a complete set of protocols, just because it is a serial interface, so there is a speed requirement for the control transmission of the chip, but the maximum speed of I 2 C is 400Kbps, this The speed affects the control speed of the autofocus device, which in turn affects the focus time of the camera.
  • the focusing technology of the existing mobile terminal camera needs to be improved and improved.
  • the technical problem to be solved by the present invention is to provide a mobile terminal having an autofocus driving circuit, which can improve the speed at which the lens is focused.
  • a technical solution adopted by the present invention is: providing an automatic a mobile terminal of a focus driving circuit, comprising a baseband chip, a driving circuit, a sound motor and a camera, the driving circuit comprising an integrating circuit, an operational amplifier, a transistor and a first resistor; an output end of the baseband chip passes through an integrating circuit
  • the inverting input terminal of the operational amplifier is connected, the positive input end of the operational amplifier is connected to the collector of the triode, and the output end is connected to the base of the triode; the collector of the triode is grounded through the first resistor, and the emitter passes through the voice coil
  • the motor is connected to the camera; the triode is a PNP transistor;
  • the integration circuit includes a second resistor and a capacitor, and the second resistor is connected in series between the baseband chip and an inverting input terminal of the operational amplifier, and one end of the capacitor is One end of the second resistor is connected to the operational amplifier, and the other end is grounded.
  • the mobile terminal with an autofocus drive circuit wherein the mobile terminal is a mobile phone.
  • another technical solution adopted by the present invention is: providing a mobile terminal having an autofocus driving circuit, comprising: a baseband chip, a driving circuit, a voice coil motor, and a camera, wherein the driving circuit includes an integrating circuit, An operational amplifier, a transistor, and a first resistor; an output end of the baseband chip is connected to an inverting input terminal of the operational amplifier through an integrating circuit, a positive input terminal of the operational amplifier is connected to a collector of the triode, and an output terminal is connected to the triode
  • the base of the transistor; the collector of the transistor is grounded through a first resistor, and the emitter is connected to the camera through the voice coil motor.
  • the mobile terminal having an autofocus driving circuit
  • the integrating circuit includes a second resistor and a capacitor
  • the second resistor is connected in series between the baseband chip and an inverting input terminal of the operational amplifier, the capacitor One end is connected to one end of the second resistor close to the operational amplifier, and the other end is grounded.
  • the mobile terminal having an autofocus drive circuit, wherein the triode is a PNP transistor.
  • the mobile terminal with an autofocus drive circuit wherein the mobile terminal is a mobile phone.
  • another technical solution adopted by the present invention is: providing a driving circuit for focusing a lens of a mobile terminal, the baseband chip, a driving circuit, a voice coil motor, and a camera, wherein the driving circuit includes an integrating circuit, An operational amplifier, a transistor, and a first resistor; an output end of the baseband chip is connected to an inverting input terminal of the operational amplifier through an integrating circuit, a positive input terminal of the operational amplifier is connected to a collector of the triode, and an output terminal is connected to the triode
  • the base of the transistor; the collector of the transistor is grounded through a first resistor, and the emitter is connected to the camera through the voice coil motor.
  • the driving circuit for focusing the lens of the mobile terminal wherein the integrating circuit includes a second resistor and a capacitor, and the second resistor is connected in series between the baseband chip and an inverting input terminal of the operational amplifier, the capacitor One end is connected to one end of the second resistor close to the operational amplifier, and the other end is grounded.
  • the driving circuit for focusing the lens of the mobile terminal wherein the triode is a PP triode.
  • the driving circuit for focusing the lens of the mobile terminal, wherein the mobile terminal is a mobile phone.
  • the present invention provides a mobile terminal having an autofocus driving circuit and a driving circuit thereof, and the mobile terminal includes a baseband chip, a driving circuit, a voice coil motor, and a camera, which are different from the prior art.
  • the driving circuit comprises an integrating circuit, an operational amplifier and a triode, and the mobile terminal converts the voltage outputted by the baseband chip into an analog voltage through the integrating circuit, and then differentially amplifies the voltage of the forward input terminal and the reverse input terminal by the operational amplifier.
  • the current of the transistor is controlled, and the voltage at the inverting input of the op amp is regulated by the PWM duty cycle of the baseband chip.
  • the invention adjusts the current of the collector of the triode by adjusting the duty ratio of the baseband chip, thereby controlling the current flowing through the voice coil motor, improving the speed of the autofocus of the camera, and using fewer electronic components for the mobile terminal, and the circuit structure is simple. , reducing the cost of mobile terminals.
  • FIG. 1 is a structural block diagram of a mobile terminal according to an embodiment of the present invention.
  • FIG. 2 is a circuit schematic diagram of a mobile terminal according to an embodiment of the present invention.
  • the present invention provides a mobile terminal having an autofocus driving circuit and a driving circuit thereof, which differentially amplifies a voltage of a forward input terminal and an inverting input terminal thereof through an operational amplifier, thereby controlling a current flowing through a collector of the triode, and an operational amplifier
  • the voltage at the inverting input is adjusted by the PWM signal (Pulse Width Modulation) output from the baseband chip, which improves the autofocus speed of the mobile terminal.
  • the mobile terminal provided by the embodiment of the present invention includes a baseband chip 110 , a driving circuit 120 , a voice coil motor 130 , and a camera 140 .
  • the driving circuit 120 is configured to implement fast and automatic focusing of the camera to obtain a clear picture.
  • the driving circuit 120 includes an integrating circuit 121, an operational amplifier A1, a transistor Q1, and a first resistor R1. 110 passes through the integration circuit 121 and the operational amplifier A1
  • the inverting input terminal is connected, the positive input terminal of the operational amplifier A1 is connected to the collector of the transistor Q1, the output terminal of the operational amplifier A1 is connected to the base of the transistor Q1; the collector of the transistor Q1 is grounded through the first resistor R1
  • the emitter of the transistor Q1 is connected to the voice coil motor 130, and the voice coil motor 130 is connected to the camera 140.
  • the driving circuit can be formed as an integrated chip, thereby reducing the volume of the mobile terminal, the mobile terminal is a mobile phone, and the baseband chip 110 is used to generate a PWM signal with a frequency between 500 Hz and 20 kHz.
  • the operational amplifier A1 uses a closed-loop negative feedback op amp whose primary purpose is the current of the collector.
  • the integrating circuit 121 includes a second resistor R2 and a capacitor C1.
  • the second resistor R2 is connected in series between the baseband chip 110 and the inverting input terminal of the operational amplifier A1.
  • One end of the capacitor C1 is One end of the second resistor R2 is adjacent to the operational amplifier A1, and the other end is grounded.
  • the PWM signal outputted by the baseband chip 110 is integrated by the second resistor R2 and the capacitor C1, and the integrated voltage is converted into an analog voltage, which is output to the inverting input terminal of the operational amplifier A1.
  • the transistor Q1 is a PNP transistor (P P is a transistor type), and mainly functions as a switch in the driving circuit 120, so the resistance of the transistor Q1 is small and can be neglected in the driving circuit 120.
  • the PWM signal generated by the baseband chip 110 is integrated by the second resistor R2 and the capacitor C1 to convert the integrated voltage into an analog voltage. Assume that the duty cycle of the PWM signal is
  • the purpose of the operational amplifier A1 is to input the input voltage v m+ at the forward end and the input voltage at the opposite end.
  • V m - The voltage difference of V m - is amplified, and the output controls the transistor Q1.
  • the final purpose is to control the collector current I of the transistor Q1, so that the final current.
  • the current of the collector of the triode can be adjusted by the duty cycle of the PWM signal output from the baseband chip, and the current of the collector of the triode also flows through the autofocus motor (voice coil power). The current of the machine).
  • the PWM duty ratio of the baseband chip 110 can be adjusted to change the voltage on the positive input terminal V in+ of the operational amplifier, thereby adjusting the current flowing through the transistor Q1, and finally controlling the flow through the autofocus motor ( The current of the voice coil motor) quickly drives the voice coil motor to achieve autofocus.
  • the PWM signal is generated internally by the baseband chip 110, changing the duty cycle of the PWM only needs to modify the registers inside the baseband chip 110, and changing the duty ratio of the baseband chip can change the current flowing through the voice coil motor 130.
  • the focal length of the camera 140 is changed to achieve autofocus.
  • the embodiment of the present invention further corresponds to a driving circuit for focusing the lens of the mobile terminal.
  • the driving circuit is connected in series between the baseband chip of the mobile terminal and the voice coil motor, and is used to change the current flowing through the voice coil motor.
  • Mobile terminal fast, auto focus.
  • the drive circuit has been described in detail above and will not be described here.
  • the present invention provides a mobile terminal having an autofocus drive circuit and a drive circuit thereof.
  • the mobile terminal includes a baseband chip, a drive circuit, a voice coil motor, and a camera, and the drive circuit includes an integration circuit and an operation.
  • An amplifier, a triode and a first resistor the mobile terminal converts a voltage outputted by the baseband chip into an analog voltage through an integrating circuit, and then differentially amplifies a voltage of the forward input terminal and the inverting input terminal by the operational amplifier to control the current of the triode
  • the current of the collector of the triode is also the current of the voice coil motor, thus achieving autofocus.
  • the invention adjusts the current of the collector of the triode by adjusting the duty ratio of the baseband chip, thereby controlling the current flowing through the voice coil motor, and the current control does not need to be transmitted through the serial interface, thereby greatly improving the speed of the camera autofocus.
  • the mobile terminal uses less electronic components, has a simple circuit structure, and reduces the cost of the mobile terminal.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
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Abstract

本发明公开了一种具有自动对焦驱动电路的移动终端及其驱动电路,其移动终包括基带芯片、驱动电路、音圈电机和摄像头,所述驱动电路包括积分电路、运算放大器、三极管和第一电阻;所述基带芯片的输出端通过积分电路与所述运算放大器的反向输入端连接,运算放大器的正向输入端连接所述三极管的集电极,输出端连接三极管的基极;三极管的集电极通过第一电阻接地,发射极通过所述音圈电机连接摄像头。本发明通过调整基带芯片的占空比来调节三极管集电极的电流,从而控制了流过音圈电机的电流,提高了摄像头自动对焦的速度,并且移动终端使用的电子元器件少,电路结构简单,降低了移动终端的成本。

Description

具有自动对焦驱动电路的移动终端及其驱动电路
【技术领域】
本发明涉及移动终端摄像头的对焦技术领域, 特别涉及一种具有自动对焦 驱动电路的移动终端及其驱动电路。
【背景技术】
目前, 摄像头已成为手机终端的一种常规配件, 随着用户对手机摄像头像 素分辨率和拍摄清晰度的要求提高, 在生产手机时, 也会配置一个高分辨率的 摄像头。
摄像头在超过两百万像素时, 一般都带有自动对焦 (AF-auto focus)装置, 这 样才可以使摄像头拍摄的图片清晰。 自动对焦装置 (目前常用的是在摄像头内 部集成一个音圈电机)通过调整摄像头前端的光线采集镜头的焦距, 来实现焦 距的变化, 以达到获取清晰图像的目的。 而控制摄像头的焦距是通过控制流过 音圈电机中的电流来实现, 并且电流的大小决定音圈电机转动的角度, 从而可 以实现对焦。
对于自动对焦装置通常需要一个驱动电路来控制电流的大小, 传统的做法 一般会采用一颗专用的 IC芯片 ( integrated circuit, 集成电路) 来实现, 并且这 颗 IC芯片的 I2C接口与手机的基带芯片接口连接, 并且芯片内部需要配置一个 DAC模块 (数字模拟转换器)。 但是, 使用这种驱动 IC具有以下两个缺点: 第一、 因为 IC内部需要配置 DAC模块, 使芯片的价格比较高; 第二、 该 芯片和手机基带芯片的接口是 I2C接口, 由于 I2C接口是一种串行接口, 它有一 套完整的协议, 正因为它是一种串行接口, 所以存在对该芯片控制传输上的速 度要求, 但 I2C的最高速度为 400Kbps, 这个速度会影响自动对焦装置的控制速 度, 进而影响摄像头对焦的时间。
因而现有移动终端摄像头的对焦技术还有待改进和提高。
【发明内容】
本发明主要解决的技术问题是提供一种具有自动对焦驱动电路的移动终 端, 能提高镜头对焦的速度。
为解决上述技术问题, 本发明采用的一个技术方案是: 提供一种具有自动 对焦驱动电路的移动终端, 其包括基带芯片、 驱动电路、 音圏电机和摄像头, 所述驱动电路包括积分电路、 运算放大器、 三极管和第一电阻; 所述基带芯片 的输出端通过积分电路与所述运算放大器的反向输入端连接, 运算放大器的正 向输入端连接所述三极管的集电极, 输出端连接三极管的基极; 三极管的集电 极通过第一电阻接地,发射极通过所述音圈电机连接摄像头;所述三极管为 PNP 三极管; 所述积分电路包括第二电阻和电容, 所述第二电阻串联在所述基带芯 片和运算放大器的反向输入端之间, 所述电容的一端与所述第二电阻的靠近运 算放大器的一端连接, 另一端接地。
所述的具有自动对焦驱动电路的移动终端, 其中, 所述移动终端为手机。 为解决上述技术问题, 本发明采用的另一个技术方案是: 提供一种具有自 动对焦驱动电路的移动终端, 其包括基带芯片、 驱动电路、 音圈电机和摄像头, 所述驱动电路包括积分电路、 运算放大器、 三极管和第一电阻; 所述基带芯片 的输出端通过积分电路与所述运算放大器的反向输入端连接, 运算放大器的正 向输入端连接所述三极管的集电极, 输出端连接三极管的基极; 三极管的集电 极通过第一电阻接地 , 发射极通过所述音圈电机连接摄像头。
所述的具有自动对焦驱动电路的移动终端, 其中, 所述积分电路包括第二 电阻和电容, 所述第二电阻串联在所述基带芯片和运算放大器的反向输入端之 间, 所述电容的一端与所述第二电阻的靠近运算放大器的一端连接, 另一端接 地。
所述的具有自动对焦驱动电路的移动终端, 其中, 所述三极管为 PNP三极 管。
所述的具有自动对焦驱动电路的移动终端, 其中, 所述移动终端为手机。 为解决上述技术问题, 本发明釆用的另一个技术方案是: 提供一种移动终 端镜头对焦的驱动电路, 所述基带芯片、 驱动电路、 音圈电机和摄像头, 所述 驱动电路包括积分电路、 运算放大器、 三极管和第一电阻; 所述基带芯片的输 出端通过积分电路与所述运算放大器的反向输入端连接, 运算放大器的正向输 入端连接所述三极管的集电极, 输出端连接三极管的基极; 三极管的集电极通 过第一电阻接地, 发射极通过所述音圈电机连接摄像头。
所述的移动终端镜头对焦的驱动电路, 其中, 所述积分电路包括第二电阻 和电容, 所述第二电阻串联在所述基带芯片和运算放大器的反向输入端之间 , 所述电容的一端与所述第二电阻的靠近运算放大器的一端连接, 另一端接地。 所述的移动终端镜头对焦的驱动电路, 其中, 所述三极管为 P P三极管。 所述的移动终端镜头对焦的驱动电路, 其中, 所述移动终端为手机。
本发明的有益效果是: 区别于现有技术的情况, 本发明提供的一种具有自 动对焦驱动电路的移动终端及其驱动电路, 其移动终端包括基带芯片、 驱动电 路、 音圈电机和摄像头, 并且所述驱动电路包括积分电路、 运算放大器和三极 管, 移动终端通过积分电路将基带芯片输出的电压转换为模拟电压, 再由运算 放大器将其正向输入端和反向输入端的电压进行差分放大来控制三极管的电 流, 而运放反向输入端的电压通过基带芯片的 PWM占空比来调节。本发明通过 调整基带芯片的占空比来调节三极管集电极的电流, 从而控制了流过音圈电机 的电流, 提高了摄像头自动对焦的速度, 并且移动终端使用的电子元器件少, 电路结构简单, 降低了移动终端的成本。
【附图说明】
图 1是本发明实施例提供的移动终端的结构框图;
图 2是本发明实施例提供的移动终端的电路原理图。
【具体实施方式】
本发明提供一种具有自动对焦驱动电路的移动终端及其驱动电路, 通过运 算放大器将其正向输入端和反向输入端的电压进行差分放大, 从而控制流过三 极管集电极的电流, 而运算放大器反向输入端的电压通过基带芯片输出的 PWM 信号( Pulse Width Modulation, 脉冲宽度调制)调节, 提高了移动终端自动对焦 的速度。
为使本发明的目的、 技术方案及效果更加清楚、 明确, 以下参照附图并举 实例对本发明进一步详细说明。 应当理解, 此处所描述的具体实施例仅用以解 释本发明, 并不用于限定本发明。
请参阅图 1和图 2, 本发明实施例提供的移动终端包括基带芯片 110、 驱动 电路 120、 音圈电机 130和摄像头 140, 所述基带芯片 110、 驱动电路 120、 音 圈电机 130和摄像头 140依次连接。
其中, 所述驱动电路 120 用于实现摄像头快速的, 自动的对焦从而使摄像 头获得清晰的图片, 该驱动电路 120包括积分电路 121、 运算放大器 Al、 三极 管 Q1和第一电阻 R1 , 所述基带芯片 110通过积分电路 121与运算放大器 A1 的反向输入端连接,运算放大器 Al的正向输入端连接所述三极管 Q1的集电极, 运算放大器 A1的输出端连接三极管 Q1的基极; 所述三极管 Q1的集电极通过 第一电阻 R1接地, 三极管 Q1 的发射极连接音圈电机 130, 所述音圈电机 130 与所述摄像头 140连接。
本实施例中, 所述驱动电路可以做成一块集成芯片, 从而缩小移动终端的 体积, 移动终端为手机, 并且基带芯片 110 用于产生 PWM信号, 其频率在 500Hz ~ 20KHz之间。 所述运算放大器 A1釆用闭环负反馈运放, 其主要目的是 集电极的电流。
请继续参阅图 2, 所述积分电路 121包括第二电阻 R2和电容 Cl, 所述第二 电阻 R2串联在基带芯片 110和运算放大器 A1的反向输入端之间,所述电容 C1 的一端与所述第二电阻 R2的靠近运算放大器 A1的一端连接, 另一端接地。
在驱动电路中, 基带芯片 110输出的 PWM信号经第二电阻 R2和电容 C1 进行积分, 将积分后的电压转变为模拟电压, 输出给运算放大器 A1的反向输入 端。
其中, 所述三极管 Q1为 PNP三极管 ( P P为三极管的型号 ), 并且在该驱 动电路 120中主要起开关作用, 所以该三极管 Q1的电阻很小, 在驱动电路 120 中可以忽略。
以下对本发明实施例提供的移动终端在对焦时, 其驱动电路的工作原理进 行评细描述:
由基带芯片 110产生的 PWM信号, 该 PWM信号经过第二电阻 R2以及电 容 C1进行积分, 将积分后的电压转换为模拟电压。 假设 PWM信号的占空比为
D, 电压幅度为 , 则运算放大器 A1反向输入端接收到的 PWM信号转换的模 拟电压为 vm- = V xi3
运算放大器 A1正向输入端的电压来自第一电阻 R1上的电压。 假设流过第 一电阻 R1的电流为 I, 则运算放大器 A1正向输入端的电压为 + = x ?i。
而运算放大器 A1的目的是将其正向端的输入电压 vm+与反向端的输入电压
Vm-的电压差进行放大, 输出控制三极管 Q1 , 其最终目的是控制三极管 Q1集电 极电流 I, 使得最终的电流 。
从上述公式可以看出 ,三极管集电极的电流可以通过基带芯片输出的 PWM 信号的占空比来调节, 而三极管集电极的电流也是流过自动对焦马达(音圈电 机) 的电流。
所以移动终端在对焦时,可以通过调整基带芯片 110的 PWM占空比, 来改 变运算放大器正向输入端 Vin+上的电压, 从而调整流过三极管 Q1的电流, 最终 控制流过自动对焦马达(音圈电机) 的电流, 快速驱动音圈电机, 从而实现自 动对焦。
因为 PWM信号是由基带芯片 110内部产生,改变 PWM的占空比只需修改 基带芯片 110 内部的寄存器就可以实现, 改变了基带芯片的占空比就可以实现 改变流过音圈电机 130的电流, 从而使摄像头 140焦距的变化, 实现了自动对 焦。
基于上述的移动终端, 本发明实施例还对应一种移动终端镜头对焦的驱动 电路, 该驱动电路串联在移动终端的基带芯片和音圈电机之间, 用于改变流过 音圈电机的电流, 实现移动终端快速, 自动对焦。 基于在上文已对该驱动电路 进行了详细的描述, 此处不再赘述。
综上所述, 本发明提供的一种具有自动对焦驱动电路的移动终端及其驱动 电路, 其移动终端包括基带芯片、 驱动电路、 音圈电机和摄像头, 并且所述驱 动电路包括积分电路、 运算放大器、 三极管和第一电阻, 所述移动终端通过积 分电路将基带芯片输出的电压转换为模拟电压, 再由运算放大器将其正向输入 端和反向输入端的电压进行差分放大来控制三极管的电流而三极管集电极的电 流也是音圈电机的电流, 从而实现了自动对焦。 本发明通过调整基带芯片的占 空比来调节三极管集电极的电流, 从而控制流过音圈电机的电流, 因电流的控 制不需要通过串行接口来传输, 因此大大提高了摄像头自动对焦的速度, 并且 移动终端使用的电子元件少, 电路结构简单, 降低了移动终端的成本。
以上所述仅为本发明的实施例, 并非因此限制本发明的专利范围, 凡是利 用本发明说明书及附图内容所作的等效结构或等效流程变换, 或直接或间接运 用在其他相关的技术领域, 均同理包括在本发明的专利保护范围内。

Claims

权 利 要 求
1、 一种具有自动对焦驱动电路的移动终端, 其包括基带芯片、 驱动电路、 音圈电机和摄像头, 其特征在于, 所述驱动电路包括积分电路、 运算放大器、 三极管和第一电阻; 所述基带芯片的输出端通过积分电路与所述运算放大器的 反向输入端连接, 运算放大器的正向输入端连接所述三极管的集电极, 输出端 连接三极管的基极; 三极管的集电极通过第一电阻接地, 发射极通过所述音圈 电机连接摄像头; 所述积分电路包括第二电阻和电容, 所述第二电阻串联在所 述基带芯片和运算放大器的反向输入端之间, 所述电容的一端与所述第二电阻 的靠近运算放大器的一端连接, 另一端接地; 所述三极管为 PNP三极管。
2、根据权利要求 1所述的具有自动对焦驱动电路的移动终端,其特征在于, 所述移动终端为手机。
3、 一种具有自动对焦驱动电路的移动终端, 其包括基带芯片、 驱动电路、 音圈电机和摄像头, 其特征在于, 所述驱动电路包括积分电路、 运算放大器、 三极管和第一电阻; 所述基带芯片的输出端通过积分电路与所述运算放大器的 反向输入端连接, 运算放大器的正向输入端连接所述三极管的集电极, 输出端 连接三极管的基极; 三极管的集电极通过第一电阻接地, 发射极通过所述音圈 电机连接摄像头。
4、根据权利要求 3所述的具有自动对焦驱动电路的移动终端,其特征在于, 所述积分电路包括第二电阻和电容, 所述第二电阻串联在所述基带芯片和运算 放大器的反向输入端之间, 所述电容的一端与所述第二电阻的靠近运算放大器 的一端连接, 另一端接地。
5、根据权利要求 3所述的具有自动对焦驱动电路的移动终端,其特征在于, 所述三极管为 P P三极管。
6、根据权利要求 3所述的具有自动对焦驱动电路的移动终端,其特征在于, 所述移动终端为手机。
7、 一种移动终端镜头对焦的驱动电路, 其特征在于, 包括基带芯片、 驱动 电路、 音圈电机和摄像头, 所述驱动电路包括积分电路、 运算放大器、 三极管 和第一电阻; 所述基带芯片的输出端通过积分电路与所述运算放大器的反向输 入端连接, 运算放大器的正向输入端连接所述三极管的集电极, 输出端连接三 极管的基极; 三极管的集电极通过第一电阻接地, 发射极通过所述音圈电机连 接摄像头。
8、 根据权利要求 7所述的移动终端镜头对焦的驱动电路, 其特征在于, 所 述积分电路包括第二电阻和电容, 所述第二电阻串联在所述基带芯片和运算放 大器的反向输入端之间, 所述电容的一端与所述第二电阻的靠近运算放大器的 一端连接, 另一端接地。
9、 根据权利要求 7所述的移动终端镜头对焦的驱动电路, 其特征在于, 所 述三极管为 P P三极管。
10、 根据权利要求 7 所述的移动终端镜头对焦的驱动电路, 其特征在于, 所述移动终端为手机。
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