Vibration Motor FPCB Insertion for Thin Design
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Solution Overview
Problem
Existing vibration motors in portable devices face reduced vibration effect due to the thickness of the FPCB occupying space in the vibration direction, making it difficult to achieve a light, thin, and miniature design.
Innovation Solution
The FPCB is inserted into the lower housing of the vibration motor, with a penetration hole allowing it to be embedded, reducing the space occupied in the vibration direction and increasing the vibration space, while the coil is fixed to the lower housing and the elastic support is connected to the housing and vibrator, enhancing the vibration effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the FPCB is laid flat on the lower housing, then the electrical connection is ensured, but the thickness of the FPCB occupies space in the vibration direction, reducing the vibration effect
Solution Approach 1:
The FPCB is changed from a flat layout (2D plane) to a folded layout that utilizes the thickness dimension (3D space). The FPCB includes a first section, a second section, and a third section arranged in different spatial planes, allowing electrical connection without occupying vibration direction space.
Solution Approach 2:
The FPCB is folded and embedded into the lower housing cavity, with the folded sections nested within the housing structure. This allows the FPCB to be contained within the existing housing volume without extending in the vibration direction.
2Reliability
If the elastic support is arranged between the upper cover and the vibrator, then the support function is achieved, but it occupies space in the vibration direction, making it difficult to implement a light, thin, and miniature motor
Solution Approach 1:
The elastic support is repositioned from the vertical direction (between upper cover and vibrator) to the horizontal direction (between vibrator and lower housing). This spatial reconfiguration maintains support functionality while eliminating occupation of the vibration direction space.
Solution Approach 2:
Instead of supporting the vibrator from above (between upper cover and vibrator), the elastic support now supports the vibrator from below (between vibrator and lower housing), inverting the support direction to resolve the space conflict.
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 design improves the vibration effect by saving space in the vibration direction, allowing for a more compact and efficient vibration motor that is lighter, thinner, and more miniature, while maintaining effective vibration performance.
Implementation Method 1
a coil and a vibration system being accommodated in the cavity, wherein the vibration system comprises a vibrator and an elastic support, a magnetic gap is arranged in the vibrator, a first end of the elastic support is connected to the vibrator, and a second end of the elastic support is connected to the housing; and a first end of the coil is fixed at the lower housing, a second end of the coil is inserted in the magnetic gap
Implementation Method 2
an elastic support, a coil, and an FPCB electrically connected to the coil that are arranged in the housing
Data Source
AI summary
The present invention discloses a vibration motor and a portable device. The motor comprises: a housing, comprising an upper cover and a lower housing connected to each other, an FPCB being inserted in the lower housing, a cavity being arranged inside the housing, and a coil and a vibration system being accommodated in the cavity, wherein the vibration system comprises a vibrator and an elastic support, a magnetic gap is arranged in the vibrator, a first end of the elastic support is connected to the vibrator, and a second end of the elastic support is connected to the housing; and a first end of the coil is fixed at the lower housing, a second end of the coil is inserted in the magnetic gap, and the coil is in signal connection with an external circuit through the FPCB.