VCM Lens Driving Module Layout for Compact Autofocus Cameras
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Solution Overview
Problem
The challenge is to reduce the size of the lens driving module in electronic devices with camera or video functions while maintaining the autofocus (AF) function, as the increasing display size of these devices requires a more compact lens driving mechanism.
Innovation Solution
The optical member driving mechanism includes a fixed portion with a case and bottom made of non-metal materials, a movable portion with a holder carrying an optical member, and a driving assembly that uses a voice coil motor (VCM) to move the holder along a main axis, enabling autofocus. The mechanism also incorporates a sensing element to monitor the movement of the movable portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens driving module size is reduced to meet miniaturization requirements, then the device can achieve a more compact form factor, but the autofocus function may be compromised due to insufficient space for the driving mechanism
Solution Approach 1:
The circuit assembly is embedded within the fixed portion of the lens driving module, with circuit boards nested inside the case structure. This nesting arrangement allows the circuit components to occupy internal space rather than external space, reducing the overall module volume while maintaining all necessary autofocus functions
Solution Approach 2:
The patent transitions from a traditional lateral arrangement of components to a vertical stacking configuration where the case, circuit assembly, and optical components are arranged along the optical axis direction. This dimensional reorganization reduces the horizontal footprint of the module while preserving the autofocus mechanism's functionality
2Area of stationary object
If display size is increased to meet user requirements, then user experience is improved, but the available space for the lens driving module is reduced
Solution Approach 1:
The lens driving module is segmented into distinct functional portions: a fixed portion containing the case and embedded circuit assembly, and a movable portion containing the optical member. This segmentation allows independent optimization of each portion's space requirements, enabling the overall module to be compacted to fit alongside larger displays
Solution Approach 2:
The circuit assembly is merged with the fixed portion structure, where circuit boards are embedded directly within the case. This integration eliminates the need for separate circuit board housings and reduces the total volume required for both the mechanical structure and electronic components combined
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 design achieves the miniaturization of the optical member driving mechanism, allowing for a more compact form factor in electronic devices while maintaining the autofocus functionality, thus addressing the market demand for smaller device sizes.
Implementation Method 1
a driving assembly that uses a voice coil motor (VCM) to move the holder along a main axis
Data Source
AI summary
An optical element driving mechanism is provided. The optical element driving mechanism includes a fixed portion, a movable portion and a driving assembly. The fixed portion has a main axis and includes a case and a bottom. The case is made of a non-metal material. The bottom is connected to the case. The case and the bottom are arranged along the main axis. The movable portion moves relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion.