Compact Camera Module Layout for Hand-Shake Compensation Space
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Solution Overview
Problem
The miniaturization of camera modules in portable terminals has led to a decrease in available mounting space for hand-shake compensation units and reduced movement space for optical imaging systems, compromising image quality.
Innovation Solution
A camera module design with a specific lens configuration and hand-shake compensation unit that allows for miniaturization while maintaining sufficient space for compensation, featuring a concave image-side surface on the rearmost lens and a hand-shake compensation unit that moves in a direction intersecting the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module is miniaturized, then the size of the portable terminal is reduced, but the mounting space for the hand-shake compensation unit and movement space for the optical imaging system decrease
Solution Approach 1:
The patent utilizes the space between the rearmost lens and the imaging plane, which is typically an unused gap, to mount the hand-shake compensation unit. This effectively uses the Z-dimension (optical path direction) to accommodate the compensation unit, thereby resolving the space conflict without increasing the overall module volume.
Solution Approach 2:
The hand-shake compensation unit is positioned within the space defined by the rearmost lens and the imaging plane, essentially nesting the compensation function within the existing optical system structure. This allows the compensation unit to occupy space that would otherwise be empty, enabling miniaturization while maintaining compensation capability.
2Volume of moving object
If the camera module is miniaturized, then the overall size is reduced, but the movement space of the optical imaging system decreases
Solution Approach 1:
The patent enables the optical imaging system to move in the Z-direction (optical axis direction) by utilizing the space between the rearmost lens and the imaging plane. This adds a dimensional degree of freedom for movement, allowing the system to achieve focus adjustment and hand-shake compensation without requiring lateral movement space.
Solution Approach 2:
The patent implements a movable rearmost lens structure that can adjust its position along the optical axis. This dynamic positioning capability allows the lens to move for both auto-focusing and hand-shake compensation, maximizing the utility of the limited space available in the miniaturized module.
3Area of stationary object
If the space between the rearmost lens and imaging plane is increased, then the hand-shake compensation unit can be mounted, but the total length of the optical imaging system increases
Solution Approach 1:
The space between the rearmost lens and the imaging plane serves multiple functions: it accommodates the hand-shake compensation unit, provides movement space for the optical imaging system, and maintains the optical path. This multi-functional use of space allows the module to achieve compact dimensions while providing sufficient room for the compensation unit.
Solution Approach 2:
Instead of increasing the lateral dimensions to accommodate the compensation unit, the patent utilizes the Z-dimension (distance along the optical axis) between the rearmost lens and the imaging plane. This approach adds the necessary mounting space without increasing the overall footprint or lateral dimensions of the module.
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
The design achieves a compact camera module with high resolution and sufficient space for hand-shake compensation, enabling effective image stabilization and miniaturization for portable devices.
Implementation Method 1
an optical imaging system including a frontmost lens disposed closest to an object side, a rearmost lens disposed closest to an imaging plane, and at least one middle lens disposed between the frontmost lens and the rearmost lens
Data Source
AI summary
A camera module includes: an optical imaging system including a frontmost lens disposed closest to an object side, a rearmost lens disposed closest to an imaging plane, and at least one middle lens disposed between the frontmost lens and the rearmost lens. An image-side surface of the rearmost lens is concave and an inflection point is formed on the image-side surface of the rearmost lens. 0.2<D/TTL is satisfied, D being a shortest distance between the rearmost lens and the imaging plane, and TTL being a distance from an object-side surface of the frontmost lens to the imaging plane.