Vibration Motor Compact Design Using Segmented Flat Springs
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Solution Overview
Problem
Existing vibration motors have large dimensions in both lateral and longitudinal directions due to the diagonal orientation of flat springs, leading to oblique vibration and potential contact with side wall surfaces, which increases the motor size unnecessarily.
Innovation Solution
A vibration motor design featuring a stationary portion with a casing and coil, a vibrating body with a magnet and weight, and plate-shaped elastic members with specific fastening and coupling portions that extend in the lateral direction, preventing oblique displacement and maintaining a compact size by eliminating the need for V-shaped spring openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V-shaped flat springs are used to support the vibrating body, then the vibrating body can be supported, but the motor dimension in the lateral direction increases to secure the opening of the V shape
Solution Approach 1:
The single V-shaped flat spring is divided into two separate flat springs (first and second flat springs). Each spring is positioned independently on opposite sides of the vibrating body, eliminating the need for a V-shaped opening and reducing the lateral dimension while maintaining support functionality.
2Reliability
If flat springs are diagonally positioned to support the vibrating body, then the vibrating body can be supported, but the vibrating body is more likely to vibrate obliquely
Solution Approach 1:
The fastening portions of the flat springs are positioned asymmetrically: the first flat spring is fastened to the front surface of the vibrating body while the second flat spring is fastened to the rear surface. This asymmetric positioning ensures that both springs act in the same lateral direction, preventing oblique vibration and maintaining stable lateral vibration direction.
3Reliability
If the vibrating body is spaced apart from the case to prevent weight contact, then contact is prevented, but the motor dimension in the longitudinal direction increases
Solution Approach 1:
The flat springs are pre-positioned and fastened to the vibrating body at specific locations (front and rear surfaces) before operation. This preliminary positioning ensures that during lateral vibration, the weight remains properly oriented and does not contact the side wall surfaces, eliminating the need for excessive spacing in the longitudinal direction.
4Length of stationary object
If the middle portion of flat springs is inclined, then the motor can be compact, but the vibrating body is more likely to vibrate obliquely
Solution Approach 1:
Instead of inclining the middle portion of the springs to achieve compactness (which causes oblique vibration), the invention inverts the approach by positioning the fastening portions on opposite surfaces (front and rear) of the vibrating body. This ensures that even with a compact design, both springs act in the same lateral direction, preventing oblique vibration.
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 design restricts the size of the vibration motor by preventing oblique vibration and maintaining a compact structure, ensuring the motor does not increase in size despite vibration, thus enhancing its spatial efficiency.
Implementation Method 1
The stationary portion includes a casing and a coil. The vibrating body includes a magnet and a weight. The vibrating body vibrates in a lateral direction relative to the stationary portion.
Implementation Method 2
The first elastic member has a plate shape. The first elastic member includes a first fastening portion, a second fastening portion, and a first coupling portion. The second elastic member has a plate shape. The second elastic member includes a third fastening portion, a fourth fastening portion, and a second coupling portion.
Data Source
AI summary
A first elastic member includes a first fastening portion, a second fastening portion, and a first coupling portion. A second elastic member includes a third fastening portion, a fourth fastening portion, and a second coupling portion. The first fastening portion, the second fastening portion, the third fastening portion, and the fourth fastening portion extend in a lateral direction. The first fastening portion and the second fastening portion face each other in a longitudinal direction, perpendicular to the lateral direction. The third fastening portion and the fourth fastening portion face each other in the longitudinal direction. The first coupling portion and the second coupling portion include plane portions extending in the longitudinal direction when a vibrating body has zero displacement. The first fastening portion to the fourth fastening portion extend in the lateral direction without being bent from coupled portions between themselves to a first curve to a fourth curve.