Piezoelectric Speaker Insulation Layer with Flaw Detection
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Solution Overview
Problem
Transparent piezoelectric speakers using organic polymer films are prone to damage from user contact, leading to potential electric shock due to high driving voltages applied to exposed electrodes.
Innovation Solution
Incorporation of an insulation layer with a flaw detection electrode line and a detection circuit to monitor the electrode's integrity, controlling the driving voltage to prevent exposure and notifying the user of abnormalities, with options to lower the voltage below 42.4V or set it to 0V to prevent electric shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is added to protect the driving electrode, then the transparency and aesthetic appeal are improved, but the device complexity increases and the protective film may still be damaged leading to electrode exposure
Solution Approach 1:
The patent implements a multi-layer nested structure where the driving electrode is embedded within the piezoelectric film, which is itself protected by an outer protective layer. This nested arrangement ensures that even if the outer protective layer is damaged, the driving electrode remains protected and cannot be directly exposed, thereby maintaining safety while preserving transparency.
Solution Approach 2:
The patent incorporates a detection circuit that proactively monitors the integrity of the protective film and driving electrode before damage can cause harm. The detection circuit continuously checks for electrode exposure and triggers voltage reduction in advance, preventing electric shock accidents before they can occur.
2Productivity
If high driving voltage is applied to generate practical sound pressure, then the sound output performance is improved, but the risk of electric shock to users increases
Solution Approach 1:
The patent implements a feedback control system where the detection circuit continuously monitors the integrity of the protective film and driving electrode. When damage is detected that could expose the electrode, the system automatically reduces the driving voltage from high levels (several hundreds of volts) to a safe low level (below 50V), thereby maintaining sound output performance while eliminating electric shock risk.
Solution Approach 2:
The patent dynamically changes the voltage parameter based on the operational state. When the protective film and electrode are intact, high voltage is applied for optimal sound pressure output. When damage is detected, the voltage parameter is immediately changed to a safe low level, thereby adapting the electrical parameter to the current safety conditions.
3Illumination intensity
If the piezoelectric film is made transparent to attract user interest, then the aesthetic appeal and user engagement are improved, but the possibility of user contact and surface damage increases
Solution Approach 1:
The patent uses a nested protective structure where the transparent piezoelectric film containing the driving electrode is embedded within an outer protective layer. This nested arrangement maintains the transparency and aesthetic appeal of the device while providing robust protection against user contact damage, as the electrode is protected by multiple layers rather than a single vulnerable film.
Solution Approach 2:
The patent introduces an intermediary protective layer between the user's hand and the driving electrode. This intermediary layer acts as a mediator that can withstand user contact and potential damage, thereby protecting the underlying electrode while allowing the device to maintain its transparent and aesthetically pleasing appearance.
4Reliability
If a detection circuit and voltage control system are added to monitor electrode integrity, then the safety against electric shock is improved, but the device complexity increases
Solution Approach 1:
The patent merges the detection circuit and voltage control functions into an integrated safety system that works seamlessly with the existing piezoelectric speaker structure. The detection circuit monitors the same protective film and electrode that are already part of the device, and the voltage control mechanism utilizes the existing power supply infrastructure, thereby achieving enhanced safety without proportionally increasing overall device complexity.
Solution Approach 2:
The detection circuit automatically monitors the integrity of the protective film and driving electrode, and the control system automatically adjusts the voltage in response to detected damage. This self-service capability eliminates the need for external monitoring or manual intervention, thereby improving safety while minimizing the complexity burden on the user or external systems.
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
Effectively prevents electric shock accidents by reducing the driving voltage when damage is detected, ensuring user safety and protecting the speaker's components.
Implementation Method 1
a piezoelectric film made of an organic polymer... applying, to the piezoelectric film, a driving voltage for driving the piezoelectric film
Data Source
AI summary
A piezoelectric speaker device that includes an organic polymer piezoelectric film, at least one pair of electrodes provided in contact with the piezoelectric film and the at least one pair of electrodes including a user-side electrode on a first side of the piezoelectric film, an insulation layer on the user-side electrode, a flaw detection electrode line on the insulation layer, and a detection circuit configured to detect whether the flaw detection electrode line is in a normal electric conduction state.