Movable Lens Module Stopper Structure for Thin Camera Zoom and OIS
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Solution Overview
Problem
Camera modules in portable electronic devices face challenges with increased complexity and size due to the addition of autofocusing, optical image stabilization, and zoom functions, which require complex structures and increased power consumption, and are difficult to implement in thin form factors.
Innovation Solution
A camera module design with movable lens modules and a stopper mechanism that includes a frame, extension portions, and damping members to prevent contact between lens modules, along with ball bearings and guide grooves to constrain lens positions, allowing for compact size and efficient movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lens modules are directly moved for optical image stabilization, then OIS function is achieved, but power consumption increases due to increased driving force requirements
Solution Approach 1:
The patent introduces a counterweight member that balances the weight of the lens module. When the lens module moves for OIS, the counterweight moves in the opposite direction, reducing the net driving force required and thereby lowering power consumption while maintaining OIS functionality.
Solution Approach 2:
The patent divides the lens module into multiple segments, with some lens elements fixed and others movable. This segmentation allows the OIS function to be achieved by moving only specific lens elements rather than the entire lens module, reducing the mass that needs to be accelerated and thus reducing power consumption.
2Adaptability or versatility
If space is provided in optical axis direction for lens movement, then AF and zoom functions are achieved, but camera module thickness increases
Solution Approach 1:
The patent implements lens movement not only in the optical axis direction but also in radial directions perpendicular to the optical axis. By utilizing multiple dimensions for lens displacement, the patent achieves AF and zoom functions without requiring excessive space along the optical axis, thereby reducing camera module thickness.
Solution Approach 2:
The patent employs a nested structure where lens modules are arranged concentrically around the optical axis. Multiple lens elements can move in coordinated fashion within a compact radial space, enabling zoom and focus functions without increasing the axial length of the camera 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
Enables the implementation of AF, zoom, and OIS functions without increasing the device thickness, reducing power consumption, and maintaining a compact form factor by optimizing lens module movement and stabilization.
Implementation Method 1
a damping member disposed on the extension portion to face the side of the one movable lens module in the optical axis direction
Data Source
AI summary
A camera module includes a housing; a plurality of movable lens modules disposed in an internal space of the housing and configured to be movable in an optical axis direction, each of the plurality of movable lens modules comprising at least one lens; and a stopper configured to prevent contact between at least two of the plurality of movable lens modules, wherein the stopper includes a frame mounted on the housing; an extension portion extending from the frame into the internal space of the housing to face a side of one movable lens module of the plurality of movable lens modules in the optical axis direction; and a damping member disposed on the extension portion to face the side of the one movable lens module in the optical axis direction.