Vibration Device Rotor Axial Restriction
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Solution Overview
Problem
The existing vibration generation devices in electronic devices, such as those described in Japanese Patent No. 5921743, suffer from increased thickness due to the presence of a cover that restricts the rotor's movement, leading to a larger size and reduced efficiency in vibration generation.
Innovation Solution
The vibration generation device eliminates the cover, using a restriction part positioned below the rotor to prevent axial movement and a support plate with varying diameters for easier attachment and space optimization, allowing for a thinner design while enhancing vibration efficiency by increasing the weight's centrifugal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover is used to restrict rotor movement and prevent separation, then reliability is improved, but the thickness of the vibration generation device increases
Solution Approach 1:
The patent removes the cover component entirely from the vibration generation device. Instead of using a cover to restrict rotor movement, the invention uses a restriction part integrated into the stator structure, thereby eliminating the need for the cover and reducing the overall device thickness while maintaining rotor separation prevention
Solution Approach 2:
The restriction part is merged with the stator structure, combining the functions of the stator and the restriction mechanism into a single integrated component. This eliminates the need for separate cover components and reduces the number of parts, thereby decreasing device thickness
2Stability of the object's composition
If a cover is used to restrict rotor movement, then rotor stability is improved, but device complexity increases
Solution Approach 1:
The restriction part is integrated into the stator structure, merging multiple functions into a single component. This reduces the number of separate parts and simplifies the overall device structure while maintaining rotor stability
Solution Approach 2:
The stator structure is designed to serve multiple functions: it provides magnetic field generation and simultaneously incorporates the restriction part to prevent rotor separation. This multi-functionality reduces the need for additional dedicated 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 configuration reduces the thickness of the vibration generation device and electronic devices, improves vibration generation, and allows for easier attachment and visual recognition of the rotor's rotation, enhancing user communication and device design.
Implementation Method 1
when the rotor rotates, a centrifugal force of the weight causes generation of vibration
Data Source
Figure 1
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AI summary
This vibration generation device includes a rotor that is configured to be rotatable about a rotation axis, the rotor including a weight having a center of gravity that is eccentric with respect to the rotation axis; a shaft that is inserted into the rotor and configured to rotatably support the rotor; and a restriction part that is disposed further inward than the weight in a radial direction, the restriction part being attached to one end of the shaft, and the restriction part restricting a movement of the rotor in an axial direction.