Camera Module Lens Driving Device Segmentation
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Solution Overview
Problem
Existing camera modules with autofocus and image stabilizer functions face challenges in reducing weight and power consumption while maintaining high resolution, and achieving a compact thickness due to the need for larger, heavier imaging lenses and complex lens driving mechanisms.
Innovation Solution
The camera module incorporates a movable lens driven for autofocus and a fixed lens, with a lens driving device having a movable portion that covers the fixed lens and includes a part of the fixed portion on its side surface, utilizing a VCM for low power consumption and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to obtain higher resolution, then the diameter and weight of the imaging lens become larger, but this increases the size and weight of the lens driving device and power consumption
Solution Approach 1:
The imaging lens is divided into two groups: a fixed lens group (first through fourth lenses) that remains stationary, and a movable lens (fifth lens) that is driven for autofocus. This segmentation allows the heavy fixed lenses to remain stationary while only the lighter movable lens is driven, reducing the weight of the moving portion and power consumption while maintaining high resolution capability
Solution Approach 2:
The lens driving device is positioned on the side surface of the fixed lens rather than above it, utilizing lateral space. The movable portion extends from the side of the fixed lens to cover its upper side, creating a compact three-dimensional arrangement that reduces overall device size while accommodating the autofocus mechanism
2Measurement precision
If a larger imaging lens is used to increase pixel count, then image quality improves, but the thickness and size of the camera module increase
Solution Approach 1:
The lens driving device is arranged laterally on the side surface of the fixed lens rather than extending the optical path length. This lateral positioning allows the camera module to maintain a compact thickness while accommodating the autofocus mechanism needed for high-resolution imaging
Solution Approach 2:
The movable portion of the lens driving device is positioned to cover the upper side of the fixed lens, with the movable lens integrated into this structure. This nested arrangement allows multiple lens elements to be compactly organized, reducing the overall thickness of the camera module while maintaining high resolution capability
3Measurement precision
If a complex lens driving device is used to drive all imaging lenses, then autofocus precision improves, but device complexity and power consumption increase
Solution Approach 1:
The imaging lens is divided into two groups: a fixed lens group (first through fourth lenses) that remains stationary, and a movable lens (fifth lens) that is driven for autofocus. This segmentation allows the heavy fixed lenses to remain stationary while only the lighter movable lens is driven, reducing the weight of the moving portion and power consumption while maintaining high resolution capability
Solution Approach 2:
Instead of driving all imaging lenses for autofocus, only the fifth lens (movable lens) is driven. This partial action approach provides sufficient autofocus functionality without the complexity and power consumption required to drive all lenses, achieving an optimal balance between performance and simplicity
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 configuration enables a small-sized, thin, and low-power camera module capable of high-resolution imaging, with reduced weight and thickness, while maintaining effective autofocus and image stabilization functions.
Implementation Method 1
a lens driving device that drives the movable lens... utilizing a VCM for low power consumption and compact design
Data Source
AI summary
Provided is a camera module that is capable of driving with low power consumption and is small-sized and thin even in a case of having high resolution. A movable portion (4) provided in a lens driving device (9) of a camera module (20) has a shape that covers an upper side of a fixed lens (1b) and at least a part of a side part (side surface) of the fixed lens (1b).