Endoscope Image Pickup Unit Stress Sensor Placement
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Solution Overview
Problem
Endoscopes face challenges in accurately detecting the direction of the distal end portion due to variations in wiring and stress loads applied during bending operations, leading to errors in sensor output.
Innovation Solution
An image pickup unit is integrated with an image sensor, a physical quantity detection sensor, and a stress detection sensor, where the stress detection sensor is positioned between the physical quantity detection sensor and the wiring connection member to correct for stress-induced variations, using a substrate with specific deformation regions to enhance sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a physical quantity detection sensor is provided at the distal end portion to detect direction, then direction detection capability is improved, but measurement precision deteriorates due to stress-induced errors from wiring and bending operations
Solution Approach 1:
A stress detection sensor is introduced as an intermediary element between the physical quantity detection sensor and the external environment. This stress sensor detects stress values generated by wiring and bending operations, which then serve as correction data to compensate for errors in the physical quantity sensor's output, thereby improving measurement precision without sacrificing direction detection capability
Solution Approach 2:
The system implements a feedback mechanism where the stress detection sensor continuously monitors stress conditions and provides correction values back to the physical quantity detection system. This feedback loop enables real-time compensation for stress-induced errors, maintaining accurate measurements despite varying operational conditions
2Adaptability or versatility
If multiple sensors are integrated at the distal end, then functionality is improved, but device complexity increases due to additional wiring connections
Solution Approach 1:
The stress detection sensor and physical quantity detection sensor are merged into a single integrated sensor unit with shared wiring connections. This combination allows multiple sensing functions to be achieved while reducing the overall complexity of the wiring structure, as both sensors utilize the same connection pathways to the external system
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 improves the accuracy of physical quantity detection by correcting for stress-induced errors, allowing for precise direction detection and enhanced performance during bending operations of the endoscope's insertion portion.
Implementation Method 1
a stress detection sensor configured to detect a correction value of the physical quantity from stress in a dynamic state
Implementation Method 2
a physical quantity detection sensor configured to detect a physical quantity such as acceleration or angular acceleration
Data Source
AI summary
An image pickup unit includes: an image sensor; a physical quantity detection sensor; and a holding member that is provided with a wiring connection member to which a cable is connected, in which a distal end of the stress detection sensor is provided between the physical quantity detection sensor and the wiring connection member.