Lens Driving Device Magnetic Support Mechanism
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Solution Overview
Problem
Conventional lens driving devices with VCM mechanisms have limited design freedom due to the need for a magnet on the lens barrel to hold guide members, restricting the layout of internal camera module structures as the magnet's size and position dictate the arrangement of other components.
Innovation Solution
A lens driving device with a support mechanism using magnetic materials for both the first and second support portions, allowing the guide member to be held by magnetic attraction force between these portions, eliminating the need for a magnet on the lens barrel and increasing design freedom by decoupling the magnet's position from the guide member's holding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnet is provided on the lens barrel to hold guide members, then the guide members can be securely held between the lens barrel and housing, but the layout of internal structures is restricted and design freedom is reduced
Solution Approach 1:
The patent extracts the magnet from the lens barrel and relocates it to the housing. This separation allows the guide members to be held by magnetic attraction between the housing-mounted magnet and the lens barrel-mounted support portion, freeing the lens barrel from carrying the magnet and enabling greater layout flexibility for other internal components.
Solution Approach 2:
The patent introduces a support portion mounted on the lens barrel as an intermediary magnetic element. This support portion works in conjunction with the magnet in the housing to create magnetic attraction that holds the guide members, thereby decoupling the direct need for a magnet on the lens barrel while maintaining reliable guide member positioning.
2Measurement precision
If the size of the image sensor is increased to improve image quality, then higher image quality is achieved, but the optical system and lens barrel become larger and heavier
Solution Approach 1:
The patent replaces the mechanical repulsive force system with a magnetic attraction system. By using magnetic attraction between the housing-mounted magnet and the lens barrel-mounted support portion to hold guide members, the system achieves more efficient force transmission with reduced mechanical friction, enabling better support for heavier lens barrels without proportionally increasing the holding mechanism's weight.
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 allows for more flexible internal structure layouts in camera modules, enabling larger and heavier optical systems without compromising driving force, as the magnetic attraction between support portions can hold guide members effectively, reducing frictional resistance and enhancing autofocus functionality.
Implementation Method 1
each of the first support portion and the second support portion is formed from magnetic material, and a guide member held between the first support portion and the second support portion by magnetic attraction force generated between the first support portion and the second support portion
Implementation Method 2
a coil provided on the at least one lens barrel and a magnet provided on the housing, By supplying an electrical current from a control unit 550 to the coil 543, it is possible to generate either one of first driving force F1 in a direction for separating the lens barrel 520 from a circuit board 560
Data Source
AI summary
A lens driving device contains at least one lens barrel, a housing for containing the at least one lens barrel therein, a support mechanism for supporting the at least one lens barrel so that the at least one lens barrel can be driven in a vertical direction, and a driving mechanism for providing driving force driving the at least one lens barrel. The support mechanism includes a first support portion fixedly provided in the housing, a second support portion provided on the at least one lens barrel, and a guide member held between the first support portion and the second support portion. Each of the first support portion and the second support portion is formed from magnetic material. The guide member is held between the first support portion and the second support portion by magnetic attraction force generated between the first support portion and the second support portion.