Movable Lens Module Stopper Structure for Compact AF Zoom Cameras
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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 featuring movable lens modules with stoppers 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 without increasing device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lens modules are disposed adjacently in the optical axis direction to implement AF and zoom functions, then the camera module can achieve autofocusing and zoom capabilities, but the lens modules may contact each other during movement, causing operational failure
Solution Approach 1:
A stopper is introduced as an intermediary component between adjacent lens modules to prevent direct contact. The stopper includes a damping member that limits the movement range of each lens module, ensuring they can move independently for AF and zoom operations without colliding with neighboring modules.
2Ease of operation
If lens modules are allowed to move freely in the optical axis direction for AF and zoom functions, then focusing and zooming performance is improved, but the lens modules may move excessively and contact each other
Solution Approach 1:
The stopper is pre-configured with damping members that exert a limiting force on lens module movement before contact can occur. This preliminary anti-action prevents excessive movement by establishing mechanical boundaries that stop lens modules at safe distances from each other.
3Length of stationary object
If the camera module is designed with thin form factor for portable devices, then device thickness is reduced, but there is insufficient space in the optical axis direction for lens modules to move for AF and zoom functions
Solution Approach 1:
The stopper is integrated into the housing structure with extension portions that nest within the limited space between lens modules. This nested configuration allows the stopper to function effectively in preventing lens contact while occupying minimal space in the optical axis direction, enabling thin camera module design.
4Device complexity
If direct mechanical connection is used between lens modules for movement control, then structure is simplified, but the weight of lens modules and attached members increases, requiring more driving force and increasing power consumption
Solution Approach 1:
The stopper acts as a passive intermediary that provides mechanical guidance and limits movement without requiring active driving force. By using the stopper's damping members to constrain lens module ranges, the system reduces the power needed for motors while maintaining reliable AF and zoom operations.
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 in a compact form factor, reducing power consumption and maintaining device thickness 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.