Camera Module Moving Frame PCB Tension Control
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Solution Overview
Problem
Existing camera modules face challenges in maintaining accurate movement of the lens barrel due to tension variations in the printed circuit board, especially as the camera module size becomes more compact.
Innovation Solution
The camera module incorporates a moving frame that is driven along three axes by a fixed frame with integrated driving coils and magnets, ensuring precise movement of the lens barrel while maintaining a constant tension in the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module size is made compact, then the device becomes more portable and space-efficient, but tension variation in the printed circuit board increases, obstructing driving unit movement
Solution Approach 1:
The patent divides the support structure into a fixed frame and a moving frame, separating the functions of structural support and electrical connection. The printed circuit board is specifically attached to the moving frame rather than the fixed frame, allowing it to move with the lens barrel and maintain constant tension throughout the focusing process.
Solution Approach 2:
The moving frame acts as an intermediary between the fixed frame and the printed circuit board. It transmits the driving forces from the driving units while carrying the printed circuit board, ensuring that the PCB experiences consistent tension regardless of the lens barrel's position.
2Ease of operation
If the printed circuit board is connected to the moving driving unit, then electrical supply is enabled, but tension variation is generated during lens barrel movement
Solution Approach 1:
The patent makes the printed circuit board's attachment point dynamic by attaching it to the moving frame instead of a fixed position. This allows the PCB to dynamically follow the lens barrel's movement, maintaining optimal tension and electrical connection throughout the focusing range.
Solution Approach 2:
The patent changes the position parameter of the printed circuit board's attachment point from a fixed coordinate to a variable coordinate that moves with the lens barrel. This parameter change ensures the PCB remains in the optimal state throughout the focusing process.
3Manufacturing precision
If driving units are integrated into the moving frame, then precise Auto Focus and Optical Image Stabilization are achieved, but device complexity increases
Solution Approach 1:
The moving frame serves multiple functions simultaneously: it supports the lens barrel, carries the printed circuit board, and transmits driving forces from the driving units. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent merges the support function and the electrical connection function into a single moving frame structure. By combining these functions, the design avoids the need for separate mounting structures and additional connection points, simplifying the overall architecture.
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 solution enables precise Auto Focus and Optical Image Stabilization functions while preventing tension variations in the printed circuit board, ensuring accurate and reliable camera module performance.
Implementation Method 1
a fixed frame with integrated driving coils and magnets, ensuring precise movement of the lens barrel
Data Source
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AI summary
A camera module includes a lens barrel (10) including at least one lens group (11); a moving frame (200) that includes the lens barrel and moves in an optical axis direction and in a first direction and a second direction that are perpendicular to the optical axis direction; a fixed frame (100) that movably supports the moving frame and provides the moving frame with a driving force in the optical axis direction, a driving force in the first direction, and a driving force in the second direction; and a base (20) that fixes the fixed frame and includes an image sensor (21) that is spaced apart from the at least one lens group in the optical axis direction.