VCM Camera Module Housing Structure for Large-Stroke Bobbin Motion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera modules with VCM actuators face interference issues due to the large strokes of the bobbin, which complicates accurate focusing control and requires structural changes to prevent interference with adjacent elements.
Innovation Solution
The camera module incorporates a support protrusion integrated with the housing member to create a moving space for the upper elastic member, allowing the bobbin to move smoothly without interfering with the housing member, thus eliminating the need for a separate spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional VCM structure is used with a bobbin having large strokes for bi-directional driving, then more accurate focusing control is achieved, but interference with adjacent elements occurs and structural changes are required
Solution Approach 1:
The support protrusion is integrated directly into the housing member, merging two previously separate components (support structure and housing) into one. This eliminates the need for separate spacers and reduces structural complexity while maintaining the necessary support function for the bobbin's bi-directional movement
Solution Approach 2:
The housing member is segmented with a protrusion that creates a dedicated moving space for the upper elastic member. This segmentation allows the bobbin to move freely in bi-directional driving without interfering with adjacent elements, enabling accurate focusing control
2Measurement precision
If the bobbin is allowed to move with large strokes for accurate focusing, then focusing precision is improved, but interference with adjacent elements occurs
Solution Approach 1:
The support protrusion extends in a direction perpendicular to the bobbin's movement path, creating a three-dimensional moving space that allows the bobbin to achieve large strokes for accurate focusing without interfering with adjacent elements in the horizontal plane
3Stability of the object's composition
If multiple separate parts are used to support the bobbin movement, then structural stability is improved, but the number of parts and manufacturing costs increase
Solution Approach 1:
The support protrusion is formed as an integral part of the housing member, combining the housing and support functions into a single component. This reduces the number of parts and manufacturing costs while maintaining structural stability through the protrusion's geometric design
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 enables smooth bi-directional movement of the bobbin, reduces the number of parts and manufacturing costs, and prevents erroneous operations due to foreign objects entering the gaps between parts.
Implementation Method 1
The VCM may perform an auto focusing function by being operated by an electrical interaction between a magnet fixed to a holder member and a coil unit wound on a periphery of a bobbin
Implementation Method 2
the electricity is cut off during movement to an opposite direction to allow the bobbin to return to an original position by self-weight of the bobbin and elastic restoring force of the elastic members
Data Source
AI summary
A camera module according to an exemplary embodiment of the present disclosure is proposed, the camera module including a PCB (Printed Circuit Board) mounted with an image sensor, a housing member arranged at an upper surface of the PCB, a bobbin movably positioned at an inner side of the housing member, an upper elastic member connected to an upper surface of the housing member and to an upper surface of the bobbin, and a space forming part formed at one side of the housing member to provide a moving space to the upper elastic member when the bobbin makes a relatively vertical movement to the housing member.