Vibration Motor Coil Nesting for Thinner Mobile Devices
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Solution Overview
Problem
The challenge is to create a compact vibration motor that can provide a strong vibration sense while minimizing the thickness of electronic devices, which is essential for modern devices with limited space.
Innovation Solution
The vibration motor features a housing with a protruding portion forming a concave cavity, where the driving coil is partially or fully located. This design reduces the height of the driving coil, allowing for a larger and heavier movable component, enhancing vibration performance and experience while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving coil is made taller to generate sufficient electromagnetic force, then the vibration effect is improved, but the thickness of the electronic device increases
Solution Approach 1:
The patent repositions the driving coil from a vertical arrangement (extending in the thickness direction) to a horizontal arrangement (extending in the width direction) by creating a concave cavity in the housing. This dimensional change allows the coil to achieve sufficient length for electromagnetic force without increasing device thickness, directly resolving the contradiction between vibration effect and device thickness.
Solution Approach 2:
The driving coil is nested within a concave cavity formed in the housing structure. This nesting approach allows the coil to be accommodated within the existing device envelope without adding external thickness, while still providing sufficient space for the coil to generate the required electromagnetic force for effective vibration.
2Weight of moving object
If the space for the movable component is increased to improve vibration performance, then the weight and vibration effect are improved, but the overall volume of the vibration motor increases
Solution Approach 1:
The movable component is positioned within the inner cavity of the housing, utilizing the three-dimensional space efficiently. The concave cavity in the first side wall further optimizes this spatial arrangement, allowing the movable component to achieve sufficient volume and weight for improved vibration performance without proportionally increasing the overall motor volume.
Solution Approach 2:
The patent optimizes the spatial distribution of the movable component by utilizing the width and depth dimensions within the housing rather than only the thickness dimension. This allows the movable component to achieve sufficient mass for better vibration effect while keeping the motor compact in the thickness direction.
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 achieves a more compact vibration motor design, reducing the thickness of electronic devices while improving vibration effect and user experience through increased weight and efficiency of the movable component.
Implementation Method 1
a vibration motor is a component that uses a principle of generating electromagnetic force to convert electrical energy into mechanical vibration
Implementation Method 2
elastic components are disposed between two opposite side walls of the movable component and inner walls of the housing on corresponding sides
Data Source
AI summary
A vibration motor and an electronic device are provided. The vibration motor may be applied to electronic devices such as a mobile phone and a PAD. A partial region of a first side wall of a housing of the vibration motor protrudes outward to form a concave cavity with an opening facing a movable component. A driving coil is partially or completely located in the concave cavity. In a case that a same electromagnetic force is achieved, the vibration motor in this application may reduce a height of the driving coil protruding from the opening of the concave cavity as much as possible.