Flexible Tactile Sensor Unit for Robot Arm Fingertip Downsizing
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Solution Overview
Problem
Existing tactile sensors for robot arms are bulky due to the size requirements of vision-type contact sensors, which increase the size of the robot arm's distal end when applied, necessitating a downsized tactile sensor solution.
Innovation Solution
A tactile sensor unit featuring a compound-eye imaging system with multiple imaging devices disposed on a flexible sheet, including an illuminating unit and a deformation layer with a marker, allowing for compact mounting on a robot arm's fingertip without increasing its size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vision-type contact sensor using a camera is applied to the distal end portion of a robot arm, then surface displacement measurement capability is achieved, but the device size increases by an amount corresponding to the focal length of the camera
Solution Approach 1:
The patent replaces the optical/mechanical camera-based vision sensor with a tactile sensor system that uses an elastic layer with embedded sensors. This substitution eliminates the need for a camera lens and focal length, thereby removing the volume penalty associated with vision-type contact sensors while maintaining surface displacement measurement capability through direct mechanical contact sensing.
Solution Approach 2:
The patent employs a thin elastic layer as the sensing medium, which can be conformally mounted on the robot arm's distal end surface. This flexible film structure enables surface displacement measurement without requiring the bulky housing and lens assembly of a camera, thus achieving precise measurement while minimizing volume increase.
2Reliability
If traditional tactile sensors are mounted on the robot arm fingertip, then contact detection is achieved, but the fingertip size is enlarged
Solution Approach 1:
The patent uses a thin elastic layer that can be conformally applied to the robot arm's fingertip surface. This flexible film structure provides comprehensive contact detection coverage while maintaining a minimal thickness profile, thereby avoiding the volume increase that would result from mounting traditional rigid tactile sensor arrays.
Solution Approach 2:
The patent transitions from discrete point-contact tactile sensors to a continuous two-dimensional elastic layer with distributed sensing elements. This dimensional expansion allows comprehensive surface contact detection across the entire fingertip area without requiring thick individual sensor components, thus achieving reliable detection while minimizing overall volume.
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
Enables the detection of surface displacement and shape data with reduced thickness, allowing the tactile sensor unit to be mounted along the surface of the robot arm without enlarging the fingertip, thus achieving downsizing and maintaining functionality.
Implementation Method 1
a compound-eye imaging unit in which a plurality of compound-eye imaging devices is two-dimensionally disposed on a flexible sheet
Implementation Method 2
an illuminating unit that illuminates an imaging region of the compound-eye imaging unit
Implementation Method 3
a deformation layer in which a marker is formed in the imaging region
Data Source
AI summary
A tactile sensor unit according to one embodiment of the present disclosure includes: a compound-eye imaging unit in which a plurality of compound-eye imaging devices is two-dimensionally disposed on a flexible sheet; an illuminating unit that illuminates an imaging region of the compound-eye imaging unit; and a deformation layer in which a marker is formed in the imaging region.