Variable Thickness Coil Bobbin Flange for Camera Actuator
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Solution Overview
Problem
Conventional coil bobbins for camera blade drive devices face challenges in downsizing while maintaining endurance, as thinner flange portions are prone to deformation and misalignment, while thicker ones are difficult to miniaturize.
Innovation Solution
The coil bobbin design features flange portions with varying thicknesses, gradually reducing from thicker to thinner sections, with terminal portions located in the thicker sections, preventing deformation and allowing for downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flange portion is made thinner to downsize the coil bobbin, then the size of the coil bobbin is reduced, but the flange portion deforms and warps outwardly due to coil winding
Solution Approach 1:
The flange portion is designed with non-uniform thickness, having a thicker section and a thinner section. The thicker section is positioned at the outer periphery to provide structural support and prevent warping, while the thinner section allows for overall downsizing of the coil bobbin. This local variation in thickness resolves the contradiction between size reduction and deformation prevention.
2Reliability
If the flange portion is made thicker to prevent deformation, then the endurance and stability are improved, but it becomes difficult to downsize the coil bobbin
Solution Approach 1:
Instead of uniformly thickening the entire flange portion, the invention applies increased thickness only at the outer periphery where structural support is most needed to prevent warping. The inner section remains thinner, allowing the overall size to be reduced while maintaining reliability where it matters most.
3Stability of the object's composition
If the thickness of the flange portion is drastically changed to prevent deformation, then the structural integrity is improved, but the manufacturing complexity increases
Solution Approach 1:
The transition between the thicker and thinner sections of the flange portion is designed with a gradual curved profile rather than an abrupt step change. This curved transition maintains structural integrity by distributing stress smoothly, while also simplifying manufacturing by eliminating sharp corners and complex multi-step forming operations.
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 enhances the endurance of the flange and terminal portions, facilitates manufacturing, and enables the miniaturization of the coil bobbin and actuator, resulting in a smaller-sized blade drive device for cameras.
Implementation Method 1
an actuator for driving a blade, as an example of a blade drive device for a camera
Implementation Method 2
a rotor magnetized with differential magnetic poles in a circumferential direction and rotatably supported; and a stator inserted into the coil bobbin and effecting driving force by magnetic force on the rotor by energization of the coil
Data Source
AI summary
A coil bobbin includes: a body portion around which a coil is wound and having a cylindrical shape; a pair of flange portions formed at both ends of the body portion respectively; and terminal portions which are formed in the pair of flange portions, respectively, the terminal portions being around which respective ends of the coil are wound. The pair of flange portions have thicker portions and thinner portions, respectively, different from each other in thickness. The pair of flange portions is formed to gradually reduce a thickness from the thicker portions toward the thinner portions, respectively. The terminal portions are formed in the thicker portions, respectively.