Linear Vibration Motor for Mobile Terminal Miniaturization
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Solution Overview
Problem
Conventional vibration motors in mobile terminals are bulky and difficult to miniaturize due to their rotary design, which hinders the miniaturization of mobile devices and optimal component deployment.
Innovation Solution
A linear vibration motor design is implemented, featuring a housing with a reciprocating moving portion, elastic members, and roller members that guide the moving portion's motion, allowing for efficient lateral vibration without the need for extensive space, thus enabling a slimmer mobile terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a rotary vibration motor design is used, then the motor can generate vibration, but the device size becomes bulky and difficult to miniaturize
Solution Approach 1:
The patent inverts the conventional rotary motor design by using a linear reciprocating mechanism. Instead of rotating components, the moving portion moves back and forth linearly between first and third sides of the housing, achieving vibration through lateral reciprocation rather than rotation. This inversion enables significant size reduction while maintaining vibration functionality.
Solution Approach 2:
The patent transitions from a rotary motion (circular path) to linear reciprocating motion along a straight line between opposite sides of the housing. This dimensional change from rotational to linear motion allows the motor to be flattened and integrated more efficiently into thin mobile terminal designs, reducing overall volume.
2Volume of moving object
If the vibration motor is miniaturized, then the mobile terminal can be made slimmer, but component placement becomes more constrained
Solution Approach 1:
The patent merges multiple functions into the housing structure itself. The housing not only encloses the motor components but also serves as a guide for the moving portion's reciprocation between opposite sides. The elastic members are integrated between the moving portion and housing, combining support and vibration transmission functions into a unified structure that simplifies component placement.
Solution Approach 2:
The housing structure is designed to perform multiple functions simultaneously: it provides structural enclosure, guides the reciprocating motion of the moving portion, supports the elastic members, and transmits vibration to the terminal body. This multi-functionality reduces the number of separate components needed, making miniaturization more manageable.
3Volume of moving object
If a linear vibration motor design is used, then the device size is minimized, but secondary vibrations may increase
Solution Approach 1:
The patent extracts and isolates the vibration-generating function to a dedicated moving portion that reciprocates between opposite sides of the housing. By separating the vibration generation mechanism from other motor components and confining it to a linear path, the design minimizes unnecessary vibrations and allows for better control of secondary vibrations through the elastic members.
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 linear vibration motor design minimizes device size, optimizes component placement, and reduces secondary vibrations, facilitating the miniaturization of mobile terminals while maintaining effective vibration functionality.
Implementation Method 1
a coil formed in the housing; a moving portion formed to reciprocate between first and third sides opposite to each other in the internal space according to a change in electromagnetic field induced by the coil
Implementation Method 2
an elastic member formed between the moving portion and the housing
Implementation Method 3
a roller member formed to come in rolling contact with the top or bottom surface of the housing
Data Source
AI summary
A mobile terminal can include a case, a touch screen, a haptic module to generate vibration, a memory storing data, and a power supply unit. The haptic module may be a linear vibration motor including a housing, a coil, a moving portion, first and second elastic members; the housing includes an inner space defined by top and bottom surfaces, and first to fourth side surfaces; the coil, moving portion, and first and second elastic members are in the housing; the first and third side surfaces are spaced apart from the moving portion; the moving portion includes a magnet, first and second insertion grooves; the first and second elastic members are coil springs, the first and second elastic members are between the moving portion and the first third side surfaces, respectively; and one end of each coil spring is located at the first and second insertion grooves of the moving portion.