Lens Barrel Protective Member Segmentation
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Solution Overview
Problem
Lens barrels with cylindrical exterior members often experience issues with protective members detaching over time due to material deterioration, leading to rattling and potential scratching, as existing solutions rely solely on elastic forces for attachment.
Innovation Solution
A lens barrel design featuring a cylindrical protective member with an elastic body, an attachment-mounting member, and notched portions to secure the protective member in place, preventing detachment and facilitating assembly and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the protective member is fitted to the exterior member by elastic force alone, then the protective member can be easily installed, but the protective member deteriorates over time causing elongation and detachment
Solution Approach 1:
The protective member is divided into multiple segments along its length, with notched portions creating discrete sections. These segmented structures allow the protective member to accommodate elastic deformation while maintaining attachment through multiple fixation points, preventing complete detachment even when material properties change over time.
Solution Approach 2:
The protective member incorporates notched portions that extend in the radial direction, creating a three-dimensional structure with varying thickness. This dimensional variation allows the protective member to maintain elastic attachment properties while the notched regions provide structural stability and prevent excessive elongation that would lead to detachment.
2Reliability
If the protective member is made from rubber material with elastic force, then the protective member can cover the exterior member, but the protective member rattles and comes off due to material deterioration
Solution Approach 1:
By segmenting the protective member into notched sections, the structure can accommodate the natural aging and elastic fatigue of rubber materials. Each segment acts independently, so deterioration in one region does not compromise the entire protective member, extending its service life while maintaining protective coverage.
Solution Approach 2:
The notched portions create regions of varying thickness and stiffness within the protective member. This parameter variation allows different sections to respond differently to material aging, with thicker notched regions providing structural support that compensates for elastic force deterioration over time.
3Device complexity
If the protective member is designed without notched portions, then the structure is simple, but the protective member cannot be securely fixed and容易 comes off
Solution Approach 1:
The notched portions segment the protective member into multiple sections, creating a structure that is more complex than a simple cylindrical form but remains relatively simple to manufacture. This segmentation provides multiple attachment points that significantly improve fixation security without requiring complex mechanical fastening systems.
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 design ensures the protective member remains securely attached to the exterior member even with material elongation, preventing rattling and detachment, while simplifying assembly and manufacturing through notched portions.
Implementation Method 1
a protective member (4) including a cylindrical body (41) disposed between the exterior member (3) and the attachment-mounting member (5) in a radial direction of the exterior member (3)... fitted to the exterior member to cover one end surface of the exterior member by an elastic force of the protective member
Data Source
AI summary
A lens tube includes: a cylindrical exterior member having one axial end disposed on an object side and the other axial end disposed on an image side; a cylindrical protective member including an elastic body protecting the exterior member; and a cylindrical attachment-mounting member disposed on the inside of the exterior member and configured to mount an attachment, the protective member including: a cylindrical body disposed between the exterior member and the attachment-mounting member; an exterior-member protection portion provided at an axial end on the object side of the cylindrical body to project to the object side; and a flange portion projecting radially inwardly from an inner periphery of the cylindrical body and facing an axial end surface on the image side of the attachment-mounting member, the cylindrical body and the flange portion having at least three notched portions, the attachment-mounting member including at least three fixing portions.