Mobile Terminal Sound-on-Screen Vibrator for High-Frequency Volume
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Solution Overview
Problem
The insufficient volume on high frequency band when a mobile terminal makes sound on screen due to increased impedance of the coil, which reduces the driving force and high frequency sound output.
Innovation Solution
A mobile terminal design incorporating a vibrator with a first magnet, a second magnet, a coil, and at least one third magnet, where the third magnet is positioned to direct magnetic lines of force horizontally through the coil, reducing the number of coil turns and impedance, thereby maintaining driving force and reducing shear force on the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the coil has a large quantity of turns to meet the driving force requirement, then the driving force is sufficient, but the impedance of the coil increases, causing current to decrease on high frequency bands
Solution Approach 1:
The patent changes the spatial orientation parameter of the magnetic field by introducing a third magnet, transforming the magnetic field direction from vertical to horizontal. This parameter change allows the coil to operate efficiently at high frequencies without requiring excessive turns, thus maintaining both driving force and high frequency volume.
Solution Approach 2:
The patent introduces a new dimension to the magnetic field configuration by adding a third magnet that creates a horizontal magnetic field component. This dimensional change in magnetic field orientation enables the coil to generate sufficient driving force with fewer turns, resolving the impedance issue at high frequencies.
2Power
If the quantity of turns of the coil is increased to provide sufficient driving force, then the driving force increases, but the impedance increases proportionally, reducing current at high frequencies
Solution Approach 1:
The patent modifies the magnetic field orientation parameter by adding a third magnet positioned laterally to the coil. This changes the magnetic field direction from vertical to horizontal, enabling the coil to achieve sufficient power output with fewer turns, thereby reducing impedance and improving high frequency performance.
3Force
If the coil is designed with sufficient turns for strong driving force, then vertical vibration is effective, but shear force on the coil increases, causing degumming and reliability issues
Solution Approach 1:
The patent inverts the conventional vertical magnetic field configuration by introducing a third magnet that creates a horizontal magnetic field. This inversion changes the force generation mechanism, allowing vertical vibration to be achieved through horizontal magnetic field interaction, thereby reducing shear force on the coil and preventing degumming.
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 configuration enhances the driving force for vertical vibration, maintains sound quality on high frequency bands, reduces coil impedance, and prevents degumming, thus improving the reliability and efficiency of the sound production system.
Implementation Method 1
a third magnet located outside the coil is added to the vibrator, and a magnetization direction of the third magnet is set, in other words, the first pole of the first magnet, the first pole of the second magnet, and a second pole of the third magnet are close to each other, to forcibly specify a path and a direction of a magnetic line of force in space
Implementation Method 2
A component that is in the horizontal direction and that is of the magnetic lines of force entering the coil can drive the coil to vibrate in a vertical direction (the direction perpendicular to the display surface of the display module) in a magnetic field
Implementation Method 3
The vibrator provides a driving force to the display, to drive the display to vibrate. In this case, the display may be used as a diaphragm, and in a vibration process, air is pushed to produce a sound
Data Source
Figure 1a~1c
Figure 2~3b
Figure 4~5a
AI summary
Embodiments of this application provide a mobile terminal, relate to the field of sound on screen technologies, and are used to resolve a problem that there is an insufficient volume on a high frequency band when the mobile terminal makes a sound on screen. At least a part of a vibrator in the mobile terminal is disposed in an accommodation cavity. The vibrator includes a first magnet, a second magnet, a coil, and at least one third magnet. The first magnet, the coil, and the third magnet are all connected to a rear face of a display module. The first magnet is located in a closed region enclosed by a conducting wire of the coil. The third magnet is located on one side that is of the coil and that is away from the first magnet. The second magnet is connected to a middle frame, and a location of the second magnet and a location of the first magnet are disposed opposite each other. A first pole of the first magnet, a first pole of the second magnet, and a second pole of the third magnet are close to each other, so that at least some magnetic lines of force pass through the coil from a surface that is of the coil and that is close to the first magnet and a surface that is of the coil and that is close to the third magnet.