VCM Bobbin Structure for Bi-Directional Camera Focusing
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Solution Overview
Problem
Conventional camera modules with Voice Coil Motor (VCM) actuator modules face challenges in bi-directional focusing control due to interference between adjacent elements, requiring structural changes to accommodate the bobbin's large strokes, which complicates the camera module design and assembly.
Innovation Solution
The camera module design incorporates a support protrusion and elastic members to create a moving space for the bobbin, allowing bi-directional movement without the need for additional spacers, reducing part count and assembly complexity, and minimizing interference with other elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional camera module structure is used for bi-directional driving actuator, then the bobbin can perform focusing operation, but the large strokes of bobbin cause interference of adjacent elements
Solution Approach 1:
The support protrusion is formed integrally with the housing member, creating a nested structure where the moving space is embedded within the existing housing. This eliminates the need for separate external spacers and reduces overall structural complexity while accommodating the bobbin's bi-directional movement.
Solution Approach 2:
The support protrusion extends in the vertical direction (optical axis direction) to create clearance space, transforming a two-dimensional planar housing into a three-dimensional structure with built-in moving space. This dimensional change allows the bobbin to stroke freely without interfering with adjacent elements.
2Reliability
If additional spacers are added to accommodate bobbin movement, then interference is prevented, but part count and assembly complexity increase
Solution Approach 1:
The support protrusion merges the housing member and the spacer function into a single integrated component. The housing member simultaneously provides structural enclosure and creates the necessary moving space through its protrusion, eliminating the need for separate spacer parts and simplifying assembly.
Solution Approach 2:
The housing member is designed to perform multiple functions: it provides the structural enclosure, supports the magnetic assembly, and creates the moving space for the bobbin through its support protrusion. This multi-functionality reduces the total number of components needed in the system.
3Measurement precision
If the bobbin is suspended in space for bi-directional driving, then accurate focusing control is achieved, but structural changes are required to solve interference
Solution Approach 1:
The support protrusion is pre-formed as part of the housing member structure, establishing the moving space for the bobbin before assembly. This preliminary structural preparation allows the bobbin to be suspended in space for accurate bi-directional focusing control without requiring complex post-assembly modifications or 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
This design enables smooth bi-directional movement of the bobbin, simplifies assembly, reduces manufacturing costs, and prevents erroneous operations due to foreign objects entering gaps between parts, while maintaining accurate focusing control.
Implementation Method 1
a position of the bobbin suspended in a space is made an initial position, and when a conventional camera module structure is used as it is, there is required a structural change capable of solving an interference of adjacent elements due to strokes of bobbin being relatively great
Implementation Method 2
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 reciprocally installed at a lens barrel side
Implementation Method 3
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 4
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
Implementation Method 5
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.