Directional Loudspeaker Diaphragm Beam Mounting
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Solution Overview
Problem
Conventional directional loudspeakers face reliability issues due to the use of insulating adhesive agents, which degrade under ambient temperature and humidity, leading to peeling of the diaphragm from electrodes, and result in reduced sound pressure when replaced with more rigid materials.
Innovation Solution
The directional loudspeaker employs a diaphragm fixed to a fixed part via a plurality of beams along its outer circumference, eliminating the need for insulating adhesive agents and enhancing sound pressure by allowing beams to bend and displace the diaphragm, thereby increasing sound pressure while maintaining high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating adhesive agents are used to bond the diaphragm to electrodes, then the diaphragm can be securely fixed, but the adhesive agents degrade under ambient temperature and humidity leading to peeling and reduced reliability
Solution Approach 1:
The patent removes the insulating adhesive agent from the system entirely. Instead of bonding the diaphragm to electrodes using adhesive, the design allows the diaphragm to contact the electrodes directly at specific regions, eliminating the degradation issue associated with adhesive agents while maintaining electrical insulation where needed through the diaphragm's own material properties or alternative structures.
Solution Approach 2:
The patent introduces a protective film as an intermediary layer between the diaphragm and electrodes in certain regions. This film provides the necessary electrical insulation without relying on degradable adhesive agents, and can be designed with superior stability against temperature and humidity variations.
2Strength
If more rigid materials are used to replace insulating adhesive agents, then structural strength is improved, but sound pressure is reduced due to restricted diaphragm vibration
Solution Approach 1:
The patent applies different structural characteristics to different regions of the diaphragm assembly. In regions where structural support is needed, the diaphragm contacts the electrode structure directly or uses localized reinforcement. In regions where vibration freedom is critical for sound pressure, the diaphragm remains unbonded and free to vibrate, achieving both strength and acoustic performance through spatially differentiated design.
3Ease of manufacture
If the diaphragm is freely bonded to electrodes, then assembly is simplified, but peeling occurs under environmental stress leading to reliability issues
Solution Approach 1:
The patent eliminates the adhesive bonding step entirely from the manufacturing process. The diaphragm is positioned to contact electrodes directly or is held in place by mechanical structures such as recesses or protrusions, simplifying assembly while avoiding the reliability issues of adhesive degradation under environmental conditions.
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 ensures high reliability and sound pressure by securely retaining the diaphragm with beams, reducing the possibility of peeling and breakage, and allowing for adjustable sound pressure through beam angle and shape variations.
Implementation Method 1
an audible sound signal as audio information that is modulated with a carrier wave in the ultrasonic wave band is input to a piezoelectric element, and thereby a diaphragm provided with the piezoelectric element is vibrated and a sound wave is generated
Data Source
AI summary
In a directional loudspeaker, an audible sound signal that is modulated with a carrier wave in the ultrasonic wave band is input to a piezoelectric element, and thereby a diaphragm having the piezoelectric element is vibrated and a sound wave is generated. In such a directional loudspeaker, the diaphragm is fixed to a fixed part via a plurality of beams disposed along the outer circumference of the diaphragm.