Endoscope Front-End Structure Dual Adhesive Fixation
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Solution Overview
Problem
Existing endoscope front-end structures face challenges in securely positioning and stress reduction for the imaging module, particularly due to thermal expansion and contraction, which can lead to misalignment and increased risk of breakage.
Innovation Solution
The endoscope front-end structure incorporates a frame body with salient portions and a dual adhesive system, where a first adhesive agent temporarily fixes the imaging module to the frame body via salient portions and a second adhesive agent provides permanent fixation, reducing stress and misalignment risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single adhesive agent is used to fix the imaging module, then the structure is simple, but the connection strength is insufficient and misalignment occurs under thermal changes
Solution Approach 1:
The adhesive system is segmented into two distinct adhesive agents with different functions: the first adhesive agent provides temporary fixation during assembly, while the second adhesive agent provides permanent fixation with stress reduction. This segmentation allows each adhesive to be optimized for its specific purpose, resulting in superior overall connection strength compared to a single adhesive system.
Solution Approach 2:
The first adhesive agent is applied preliminarily to temporarily fix the imaging module in the correct position during assembly. This preliminary action ensures proper alignment before the final permanent fixation with the second adhesive agent, preventing misalignment that would occur with single-adhesive systems.
2Reliability
If adhesive is applied liberally to ensure fixation, then the imaging module is securely held, but thermal expansion and contraction cause misalignment and increased breakage risk
Solution Approach 1:
The frame body incorporates cushioning structures (elastically deformable portions) that are designed to absorb and compensate for thermal expansion and contraction forces before they can cause misalignment or breakage. This beforehand cushioning protects the imaging module from the harmful effects of temperature changes while maintaining secure fixation.
Solution Approach 2:
The system changes the physical parameters of the adhesive connection by using two adhesives with different hardness and flexibility characteristics. The first adhesive provides initial positioning, while the second adhesive provides permanent fixation with different mechanical properties that accommodate thermal stress, thereby maintaining alignment stability under temperature variations.
3Object-affected harmful factors
If a resin seal is used to protect the imaging module, then protection against moisture and stress is improved, but the positioning precision and connection strength are reduced
Solution Approach 1:
The protective and positioning functions are segmented into separate components: the resin seal provides protection against moisture and stress, while the frame body with its salient portions and dual adhesive system provides precise positioning and strong connection. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The frame body acts as an intermediary between the resin seal and the imaging module. It provides the precise positioning structures (salient portions) that locate the imaging module accurately, while also providing the adhesive bonding surfaces that ensure strong connection. The resin seal then provides environmental protection to this precisely positioned and securely connected assembly.
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 configuration enhances the connection strength, reduces adhesive usage, and prevents misalignment and breakage of the imaging module, ensuring precise positioning and improved durability under thermal changes.
Implementation Method 1
a first adhesive agent that is filled and hardened between a part of outer periphery of a resin seal and a surface of the salient portion, the part of outer periphery of the resin seal and the surface of the salient portion being bonded with each other via the first adhesive agent
Implementation Method 2
a second adhesive agent that is filled and hardened in a gap formed between the through hole of the frame body and the imaging module inserted in the through hole, the frame body and the imaging module being bonded with each other via the second adhesive agent
Implementation Method 3
generate an image signal by performing photoelectric conversion of photographic subject image, which is formed by the optical unit, using an imager
Data Source
AI summary
An endoscope front-end structure includes: an imaging module; a frame body that has a through hole and a salient portion, the frame body being configured to hold the imaging module when the imaging module is inserted in the through hole from an insertion opening formed at a proximal end of the frame body; a first adhesive agent that is filled and hardened between a part of outer periphery of a resin seal and a surface of the salient portion; and a second adhesive agent that is filled and hardened in a gap formed between the through hole of the frame body and the imaging module inserted in the through hole.