Endoscope Objective Lens Frame Catch-Lock Assembly
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Solution Overview
Problem
Existing objective lens units for endoscopes are difficult to assemble and cannot be easily disassembled for correcting misalignments, as they are permanently cemented, which can lead to impurities and irreversible positioning errors.
Innovation Solution
A separable catch-lock connection system allows the objective lens frame to be securely fastened and easily repositioned within the endoscope housing, featuring a stop mechanism to restrict insertion depth and prevent pressure on optical components, enabling correction of misalignments and avoiding impurities associated with cementing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the objective lens frame is permanently cemented to the endoscope housing, then the assembly is secure and stable, but the objective lens unit cannot be disassembled for correction of misalignments and impurities may be introduced
Solution Approach 1:
The connection between the objective lens frame and endoscope housing is segmented into separate components: a press-on element with a cylindrical insertion portion that fits into a corresponding recess, and a separate locking mechanism. This segmentation allows the assembly to be both secure during operation and disassemblable for corrections, resolving the contradiction between reliable bonding and ease of repair.
2Stability of the object's composition
If the objective lens frame is rigidly fixed in the endoscope housing, then the positioning is stable, but the insertion depth cannot be controlled and pressure may be transmitted to the objective lens
Solution Approach 1:
A stop structure is provided in the endoscope housing that preliminarily defines the maximum insertion depth of the objective lens frame. This preliminary action prevents over-insertion and ensures precise positioning before the final locking action occurs, thereby maintaining both stability and manufacturing precision.
Solution Approach 2:
The press-on element acts as an intermediary component between the objective lens frame and the endoscope housing. It provides a controlled interface that limits insertion depth through its geometric constraints while enabling stable fixation when engaged, thus mediating between the conflicting requirements of stability and precision.
Data Source
AI summary
An objective lens unit for endoscopes, with an objective lens having at least one lens and with an objective lens frame that is mounted in an endoscope housing in such a way that the insertion depth in the distal direction is restricted by a covering glass established in the endoscope housing and the objective lens frame that can be fastened in the endoscope housing forms the proximal end. In order to provide an objective lens unit for endoscopes that is simple to assemble and can be positioned in stationary manner in the endoscope housing, it is proposed according to the invention that the objective lens frame should be capable of being removably fastened in the endoscope housing.