Haptic Transducer Using Fluid Phase Change
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Solution Overview
Problem
Existing haptic feedback technologies are limited by startup delay, restricted frequency range, large size, high cost, poor reliability, and limited versatility, making them unsuitable for widespread use in mobile electronics.
Innovation Solution
A haptic transducer that vaporizes and condenses a working fluid within a sealed vessel to create a pressure change, producing controlled vibrations that can be mechanically coupled to the user, offering a compact, cost-effective, and reliable means of providing haptic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a small motor with armature and rotating shaft is used to generate haptic feedback, then vibration can be produced, but startup delay occurs and response time is slow
Solution Approach 1:
The patent replaces the traditional motor-mechanical system with a thermal-fluid system. Instead of using electromagnetic motors with armatures and rotating shafts, the invention uses a sealed vessel containing working fluid that is heated to generate pressure differentials, causing the vessel to expand and contract. This thermal-fluid mechanism eliminates mechanical inertia and startup delays, providing immediate haptic feedback response.
Solution Approach 2:
The patent utilizes phase transitions of the working fluid (liquid to gas and back) to generate haptic feedback. By heating the working fluid, it transitions from liquid to gas phase, creating rapid pressure increase that expands the vessel. The fluid then condenses back to liquid, causing pressure decrease and vessel contraction. This cyclic phase transition provides continuous vibration without startup delay.
2Adaptability or versatility
If traditional motor-based haptic devices are used, then vibration feedback is achieved, but the frequency range is limited to single or small number of fixed frequencies
Solution Approach 1:
The patent implements a dynamic system where the haptic feedback characteristics can be changed without physical reconfiguration. By controlling the heating rate, temperature, and pressure of the working fluid, the system can dynamically adjust vibration frequency and amplitude. The flexible vessel naturally responds to pressure changes with varying frequencies, enabling continuous frequency adjustment rather than fixed frequency operation.
Solution Approach 2:
The patent changes physical parameters of the working fluid (temperature, pressure, volume) to control haptic feedback characteristics. By adjusting the heating power and temperature of the working fluid, the system can vary the pressure differential magnitude and cycling frequency, thereby controlling vibration frequency and intensity. This parameter-based control provides versatile frequency adjustment capability.
3Reliability
If motor-based haptic devices are implemented, then vibration feedback is produced, but the device size becomes relatively large
Solution Approach 1:
The patent uses a flexible sealed vessel as the core haptic actuator. The vessel wall is designed with appropriate flexibility to respond to internal pressure changes by expanding and contracting. This flexible shell structure replaces bulky motor assemblies with a compact pressure-responsive chamber, significantly reducing device size while maintaining reliable haptic feedback generation.
4Reliability
If motor-based haptic devices are used, then vibration feedback is achieved, but the cost becomes relatively high preventing practical applications
Solution Approach 1:
The patent employs inexpensive components: a sealed vessel containing working fluid and a simple heating element. These components can be manufactured using standard, low-cost processes and materials. The system eliminates expensive motor assemblies, precision bearings, and complex electromagnetic components, replacing them with affordable thermal-fluid elements that achieve the same haptic feedback function at much lower cost.
5Reliability
If motor-based haptic devices are implemented, then vibration feedback is produced, but reliability becomes poor
Solution Approach 1:
The patent extracts and eliminates complex mechanical subsystems from traditional motor-based haptic devices. By removing the motor, rotating shaft, bearings, and mechanical drive train, the invention replaces them with a simplified thermal-fluid system consisting of a sealed vessel, working fluid, and heating element. This extraction of mechanical complexity directly improves reliability by reducing failure points.
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 solution provides faster response times, lower costs, improved reliability, and greater versatility in generating haptic feedback, enabling efficient use in mobile devices with reduced power consumption and noise.
Implementation Method 1
a working fluid inside a sealed vessel is vaporized to create a pressure increase with phase change
Implementation Method 2
The pressure change causes mechanical motion. The working fluid may be vaporized in this way repeatedly, condensing in the intervening time intervals
Implementation Method 3
The working fluid may be vaporized in this way repeatedly, condensing in the intervening time intervals, causing a controlled haptic motion or vibration
Data Source
AI summary
System, method and device to generate user tactile feedback using working fluid inside a sealed vessel, which is vaporized causing a rapid pressure/volume change, then the fluid condenses, restoring original pressure/volume. In one embodiment this sequence is repeated to create a vibration. The sealed vessel is mechanically coupled to a touch surface so the user feels the vibration, typically with a fingertip. In some embodiments a portion of the sealed vessel is also the touch surface. In some embodiments multiple vessels are arranged in an array behind or integral to the touch surfaces.