Loudspeaker Damper Layout for Higher Sensitivity in Thin Devices
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Solution Overview
Problem
The damper in existing loudspeakers limits the volume of the yoke and the length of the voice coil, resulting in a small electromagnetic driving force and insufficient sensitivity.
Innovation Solution
The damper is positioned in a region enclosed by the sleeve, allowing the magnet and voice coil to be larger in volume and length without interference, with additional components like a boss and pole piece to enhance the magnetic field, and the voice coil is connected to a vibration diaphragm for improved resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the damper is positioned to enclose the yoke and voice coil, then the structural stability is improved, but the volume of the magnet and length of the voice coil are limited, resulting in reduced electromagnetic driving force
Solution Approach 1:
The patent repositions the damper from enclosing the yoke and voice coil to being located within the sleeve, creating spatial separation. This dimensional rearrangement allows the magnet and voice coil to extend beyond the damper's boundaries, increasing their volume and length without compromising the damper's structural support function. The sleeve acts as a containing structure that enables this spatial reconfiguration.
2Stability of the object's composition
If the damper is positioned to enclose the yoke and voice coil, then the structural support is improved, but the sensitivity of the loudspeaker is reduced due to limited magnet and voice coil dimensions
Solution Approach 1:
The patent repositions the damper from enclosing the yoke and voice coil to being located within the sleeve, creating spatial separation. This dimensional rearrangement allows the magnet and voice coil to extend beyond the damper's boundaries, increasing their volume and length without compromising the damper's structural support function. The sleeve acts as a containing structure that enables this spatial reconfiguration.
3Force
If the volume of the magnet and length of the voice coil are increased, then the electromagnetic driving force is improved, but the device thickness increases
Solution Approach 1:
The patent employs a nested arrangement where the damper is positioned within the sleeve, and the magnet and voice coil are arranged within the annular space formed by the sleeve. This nested configuration allows the electromagnetic components to achieve greater volume and length for improved driving force while maintaining a compact overall thickness. The sleeve and basket structure provides a nested container that accommodates these components efficiently.
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 increases the electromagnetic driving force and sensitivity of the loudspeaker while maintaining a reduced thickness, facilitating ultra-thinning designs.
Implementation Method 1
the voice coil is energized, so that the voice coil vibrates in a direction of a center line of the yoke, to generate a sound
Data Source
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Figure 3
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AI summary
Embodiments of this application relate to the field of electronic device technologies, and in particular, to a loudspeaker and an electronic device. Embodiments of this application are provided to resolve a technical problem of insufficient sensitivity of a loudspeaker caused by a small electromagnetic driving force that drives a voice coil to vibrate. According to a loudspeaker and an electronic device in embodiments of this application, a yoke includes a bottom part and a sleeve located on the side of the bottom part. An annular magnet is sleeved on the outer side of the sleeve. A voice coil is sleeved on the sleeve and located between the magnet and the sleeve. A damper is located in a region enclosed by the sleeve. An outer edge of the damper is connected to the voice coil, and a middle part of the damper is connected to the yoke. Both the magnet and the voice coil are located on an outer side of the damper, so that the volume of the magnet and the length of a coil in the voice coil are not affected by the damper. The volume of the magnet and the length of the coil in the voice coil can be set to be larger, so that an electromagnetic driving force that drives the voice coil to vibrate is increased, and sensitivity of the loudspeaker is improved.