Tactile Sensor with Elastic Contact Transmission Medium
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Solution Overview
Problem
Existing tactile sensors either provide limited information, detecting only contact above a threshold force, or offer detailed spatial measurements, but often require complex and costly fabrication processes, limiting their adaptability and effectiveness in various applications.
Innovation Solution
A tactile sensor is created by applying a contact transmission medium to a pressure sensor mounted on a substrate, allowing contact forces to be transmitted through the medium to a transducer, which generates signals indicating contact and pressure distribution, with a low-cost fabrication process that includes using elastic materials and flexible enclosures to protect the sensor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed spatial measurements are provided by tactile sensors, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor array is divided into multiple discrete sensing elements (e.g., piezoresistive elements, capacitive elements) arranged in a grid or matrix pattern. Each element independently measures pressure at its location, and the collective data provides detailed spatial distribution information. This segmentation allows complex measurement capabilities to be achieved through simple, repeatable unit cells.
Solution Approach 2:
The patent uses identical or similar sensing element designs repeated across the sensor array. Each sensing element is a copy of the basic unit, fabricated using the same process and materials. This copying approach enables detailed spatial measurements while maintaining simple, consistent fabrication procedures for each element, reducing overall device complexity.
2Measurement precision
If tactile sensors provide detailed spatial measurements, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The sensor is segmented into multiple independent sensing elements that can be fabricated using standard, cost-effective processes. Each element uses inexpensive materials such as piezoresistive films, conductive inks, or simple membrane structures. The modular segmentation allows parallel fabrication and reduces tooling costs compared to monolithic designs.
Solution Approach 2:
The patent employs sensing elements with optimized physical parameters that balance performance and cost. For example, using thin-film piezoresistive layers instead of bulky strain gauge elements, or employing capacitive elements with simple electrode geometries. These parameter choices maintain measurement precision while reducing material and fabrication costs.
3Measurement precision
If contact transmission medium is applied to pressure sensor, then sensitivity is improved, but device complexity increases
Solution Approach 1:
A contact transmission medium (such as an elastic gel, silicone rubber layer, or fluid-filled chamber) is introduced as an intermediary between the contact surface and the pressure sensing elements. This medium distributes applied forces uniformly across multiple sensing elements, enhancing sensitivity by ensuring that contact forces are effectively transmitted to all relevant sensors. The intermediary layer simplifies the overall structure by providing a single, uniform interface rather than requiring direct mechanical coupling of complex transmission mechanisms.
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
The solution provides a cost-effective tactile sensor capable of adapting to a wide range of applications, offering reliable detection of contact forces and pressure distribution with enhanced sensitivity and durability, while maintaining a simple and affordable production process.
Implementation Method 1
The elastic material forms a contact surface and transfers contact forces through an opening in the housing to the transducer
Data Source
AI summary
A tactile sensor includes a pressure transducer encapsulated in an elastic material that defines a contact surface and provides a transmission path that transmits contact forces or pressure distributions applied to the contact surface to the pressure transducer. The pressure transducer can be enclosed in a protective housing that defines a chamber around the transducer. The housing can include one or more openings that expose the chamber to the exterior pressure. The tactile sensor can be made by applying the elastic material in liquid form and exposing the housing to a vacuum that removes air inside the chamber allowing the liquid elastic material to flow into the chamber. Once cured, the elastic material defines a contact surface of the tactile sensor and serves to transfer contact forces applied to the contact surface to the transducer.