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What fields are the camera modules used for?
2022年5月12日
Camera module on the Darts
2022年5月25日

What is the Auto Focus and how to realize by VCM?

What is the Auto Focus and how to realize by VCM?

Home > Blog > How to realize by VCM

Introduction

Auto Focus is to move the position of the entire lens by a small distance, control the focal length of the lens, and achieve a clear image, it is a common used method in mobile phone camera, and the auto focus is achieved by the working of VCM.

VCM-voice coil motor Introduction

1. How VCM works?

VCMFull Name: Voice Coil Montor working principle is that in a permanent magnetic field, the stretching position of the spring is controlled by changing the DC current of the coil in the motor, thereby driving the lens up and down movement.


2. Advantages of VCM

It has the advantages of small size, high precision, good integration, high reliability, and can support high power, which significantly reduces the size and volume of the finished product and reduces the cost of the whole machine.

Mobile phone cameras widely use VCM to achieve auto-focus function. Through VCM, the position of the lens can be adjusted to present a clear image.

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3. VCM classification

VCM can be roughly divided into three categories from the structure:

  • Shrapnel structure
  • Ball structure
  • Friction structure


VCM can be roughly divided into five categories in terms of functions:

  • 1.Open loop to open the motor
  • 2.Close loop closed-loop motor
  • 3.Alternate mid motor
  • 4. OIS optical anti-shake motor (sub-translation type, axis-shift type, memory metal type, etc.)
  • 5. OIS+Close loop six-axis motor

How Auto Focus works


The VCM of the mobile phone camera needs the driver IC to complete the focusing. The driver IC controls the power supply current of the VCM to determine the moving distance of the lens mounted on the VCM, so as to adjust to the appropriate position to capture a clear image.



After entering the auto-focusing mode, the Driver moves from 0 to the maximum value, so that the lens moves from the original position to the maximum displacement. At this time, the sensor imaging surface automatically captures pictures and saves them in the DSP. The DSP calculates each picture through these pictures. MTF (Modulation transfer function) value, so as to find the maximum value in this MTF curve, and through the algorithm, get the current size corresponding to this point, once again instruct the Driver to provide this current to the voice coil, and stabilize the lens on this imaging surface , so that automatic focus is achieved.


Supertekmodule Co.,Ltd focuses on the customization and manufacture of camera modules, with the cooperation of professional and technical personnel, to provide customers with differentiated product customization solutions in terms of pixels, functions, application scenarios and other aspects. Our Advantages: Free sample evaluation before customization, short development/tooling time, low development/processing cost, no MOQ.


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