Camera Lens Actuator Structure for Stopper Shock and Solder Control
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Solution Overview
Problem
Conventional camera modules face issues such as stopper damage during reliability tests, difficulty in coating dampers, loss of coated dampers, elasticity requirements for bobbin movement, resonance of elastic members, and scattering of not-cured solder balls during assembly, leading to solder foreign objects and shock reliance test failures.
Innovation Solution
A lens driving device with a bobbin featuring dual stoppers to disperse shock, a damper groove for controlled damper coating, an elastic member for AF driving, and a pocket structure to collect solder balls, ensuring proper assembly and preventing rotation and push-back of cover members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single stopper is used in the bobbin, then the structure is simple, but the stopper is damaged by being hit to the housing during reliability test
Solution Approach 1:
The single stopper is divided into two separate stoppers (first stopper and second stopper) positioned at different locations on the bobbin. This segmentation distributes the impact forces during reliability testing, preventing any single stopper from bearing excessive stress and becoming damaged.
2Ease of manufacture
If a damper is coated on the support member without a groove, then the coating process is simple, but the damper cannot be coated at a predetermined amount and is feared to be lost
Solution Approach 1:
A groove is pre-formed on the support member at the intended damper coating location. This preliminary structural preparation guides the damper coating process, ensuring the damper is applied at the correct amount and position, preventing loss or misplacement during assembly.
3Ease of operation
If an elastic member is designed with complex shape to provide elasticity, then the bobbin can move relative to housing, but the design complexity increases
Solution Approach 1:
The elastic member is designed as a flexible component with optimized geometry that provides the necessary elasticity for bobbin movement relative to the housing. The flexible structure allows controlled deformation and recovery, enabling smooth bobbin motion without requiring complex mechanical mechanisms.
4Ease of manufacture
If solder balls are coupled to the upper elastic member without a pocket structure, then the assembly process is simple, but flux evaporates and solder balls scatter to all directions
Solution Approach 1:
A pocket structure is introduced as an intermediary component between the solder balls and the external environment. This pocket confines the solder balls during the flux evaporation process, preventing them from scattering while still allowing the assembly to be manufactured with relative simplicity.
5Device complexity
If the cover member is not designed with rotation prevention features, then the assembly is simple, but push-back and rotation of the cover member occur
Solution Approach 1:
The cover member is designed with asymmetric features including a protrusion that fits into a corresponding recess and a rotation prevention structure. This asymmetric design naturally prevents the cover member from rotating or being pushed back during assembly and operation, ensuring stable positioning without requiring complex additional components.
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 solution effectively prevents stopper damage, ensures accurate damper coating, maintains elastic support, reduces resonance, and collects solder balls, enhancing reliability and assembly quality of camera modules.
Implementation Method 1
an elastic member disposed at an upper side of the bobbin to be coupled to the bobbin and the housing
Implementation Method 2
there is a difficulty in coating a damper on a support member at a predetermined amount and the coated damper is feared to be lost
Data Source
Figure 1~2
Figure 3
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AI summary
The present embodiment relates to a lens driving device including: a first movable element including a bobbin and a first coil; a second movable element including a housing and a first magnet; a base disposed below the housing; a board including a circuit member having a second coil; an upper elastic member; and a support member, wherein the bobbin includes a first stopper and a second stopper, which overlap the second movable element in an optical axis direction and are spaced apart from each other, the housing includes side parts and corner parts formed between the side parts, a first stopper is disposed on the side of the corner parts, the second stopper is disposed on the side of the side parts, and the distance between the first stopper and the second movable element in the optical axis direction is different from the distance between the second stopper and the second movable element in the optical axis direction.