Camera Module Lens Control Prevents VCA Allophone
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lens movement control methods in camera modules with Voice Coil Actuators (VCAs) suffer from prolonged operation times and frequent errors due to the occurrence of VCA allophone, which is exacerbated by the time it takes for the lens to move to the bottom surface after the camera enters stop mode.
Innovation Solution
A lens movement control method and apparatus that switches the camera module to a camera stop mode, generates a control signal to remove VCA allophone by moving the lens to a specific allophone removal location, and powers off the camera module to prevent VCA allophone, utilizing a simplified operation algorithm to reduce errors and operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens is allowed to move to the bottom surface by spring force after camera stop mode, then the lens returns to its initial position, but the bobbin collides with the bobbin support causing VCA allophone
Solution Approach 1:
The controller moves the lens to a predetermined position (above the bottom surface) before the camera stop mode is fully activated. This preliminary action ensures that when the spring force acts on the lens after power-off, the lens and bobbin are positioned such that no collision occurs between the bobbin lower end and the bobbin support, thereby preventing VCA allophone while maintaining simple automatic lens retraction
2Reliability
If the lens moves slowly to the bottom surface through repeated bobbin drops, then the lens reaches the bottom surface, but the operation time is prolonged and errors occur
Solution Approach 1:
The lens is moved to the predetermined position before camera stop mode activation, eliminating the need for repeated slow bobbin drops. This preliminary positioning allows the lens to reach the bottom surface quickly and reliably when power is cut, reducing both operation time and the likelihood of errors associated with repeated drop cycles
3Loss of energy
If the camera module enters stop mode and powers off, then energy consumption is reduced, but the lens movement to bottom surface causes VCA allophone
Solution Approach 1:
The lens is positioned at a predetermined location above the bottom surface before the camera stop mode and power-off sequence is initiated. This preliminary positioning ensures that when power is cut and spring force acts on the lens, the bobbin is already in a position where no collision with the bobbin support will occur, thus preventing VCA allophone while allowing normal power-saving shutdown procedures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents VCA allophone occurrences and reduces the time from entering stop mode to lens movement to the bottom surface, thereby minimizing errors and operation time.
Implementation Method 1
a Voice Coil Actuator (VCA) has been widely used as the means to make a lens perform a linear motion for focusing
Implementation Method 2
the bobbin moves the lens to a bottom surface by force of a spring
Data Source
AI summary
A lens movement control method and a lens movement control apparatus of a camera module for preventing allophone of a Voice Coil Actuator (VCA) are provided. The lens movement control method of a camera module includes switching the camera module from a camera operation mode to a camera stop mode, generating a control signal for removing the occurrence of VCA allophone in the camera stop mode, moving a lens to a VCA allophone removal location based on the generated control signal, and powering-off the camera module to move the lens moved to the VCA allophone removal location to a bottom surface of the lens.