Electromagnetic Speaker With Horizontal Vibration Axis
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Solution Overview
Problem
Conventional speakers in mobile devices face limitations in acoustic performance due to restricted vibration amplitude caused by thinner designs, which compromise sound quality.
Innovation Solution
An electromagnetic speaker design featuring a frame with an elongated axis, dual voice coils surrounding magnet assemblies, and elastic plates for suspension, allowing greater vibration amplitude and reduced height, enabling improved sound generation without height-related performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the speaker is designed with thinner height to meet mobile device requirements, then the device height is reduced, but the vibration amplitude is restricted and acoustic performance deteriorates
Solution Approach 1:
The patent changes the vibration direction from the traditional vertical direction (perpendicular to the screen) to a horizontal direction (parallel to the screen). This dimensional change allows the diaphragm to vibrate along the elongated axis of the frame without being constrained by the thin height of the mobile device, thereby resolving the contradiction between reduced speaker height and maintained vibration amplitude
2Device complexity
If the vibration unit is designed to vibrate perpendicular to the screen, then the electromagnetic structure is simplified, but the vibration amplitude is limited by device thickness
Solution Approach 1:
The patent reorients the vibration direction to be parallel to the screen surface, utilizing the horizontal space within the device rather than the vertical dimension. This allows the diaphragm to achieve larger vibration amplitude while maintaining a compact overall structure, effectively resolving the contradiction between structural simplicity and vibration performance
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 speaker achieves enhanced sound quality with increased vibration amplitude and balanced air pressure, maintaining performance even in thinner mobile device designs.
Implementation Method 1
While electrified, the voice coil interacts with the magnetic circuit and Lorenz Force is accordingly produced. By the Lorenz Force, the voice coil is actuated to vibrate and further drives the diaphragm to vibrate. Sound waves are thus generated.
Data Source
AI summary
The present disclosure provides an electromagnetic speaker including a frame having an elongated axis, a magnet assembly received in the frame, an elastic plate perpendicular to the elongated axis for suspending the magnet assembly in the frame, a voice coil surrounding and keeping a distance from the magnet assembly, and a diaphragm driven by the magnet assembly. When the electromagnetic speaker is mounted in a mobile phone, the diaphragm vibrates along a direction parallel to the screen, and the amplitude thereof will not be affected by the height of the mobile phone. In addition, the amplitude of the diaphragm at low frequency is greater than a normal speaker.