Lens Frame Slant Surface Impact Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lens barrel structures fail to effectively absorb impact forces during drops, leading to stress concentration and potential lens breakage due to vertical surface collisions, which can result in damage and deformation.
Innovation Solution
A lens frame structure featuring a movable lens holding frame with a shaft and a support member, where at least one region of each is a slant surface, allowing face contact and absorption of impact forces, reducing stress and preventing damage by distributing the force along the slant surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lens frame structure with vertical abutment surfaces is used, then the structure is simple and easy to manufacture, but stress concentrates at contact points during impact, leading to lens breakage
Solution Approach 1:
The patent applies curvature by replacing vertical abutment surfaces with slant surfaces that are inclined relative to the optical axis. This curved/angled surface design distributes impact forces along the slant surface area rather than concentrating stress at a single vertical contact point, thereby improving impact resistance while maintaining manufacturing feasibility through standard machining processes
2Reliability
If a lens frame moves freely along a guide shaft, then the frame can respond to focus and zoom operations, but during impact the frame collides with abutment surfaces causing stress concentration and potential damage
Solution Approach 1:
The slant surfaces are inclined at specific angles (e.g., 45 degrees) relative to the optical axis, creating a geometric configuration that transforms vertical impact forces into distributed compressive forces along the slant surface. This angular geometry prevents stress concentration by ensuring contact occurs across an area rather than at a point, thereby protecting the lens during impact events
3Reliability
If conventional vertical abutment surfaces are used, then the structure is straightforward, but bounce occurs after collision reducing protection effectiveness
Solution Approach 1:
The slant surface geometry transforms vertical impact energy into lateral compression along the inclined surface, preventing elastic rebound (bounce) that occurs with vertical surfaces. The angular configuration ensures that impact energy is absorbed through friction and deformation along the slant surface rather than being reflected back, thereby improving impact absorption and reducing energy loss through bounce
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 slant surface design effectively absorbs impact forces, reducing the likelihood of damage and deformation by distributing the force and minimizing bounce, thus protecting the lens frame from breakage and deformation.
Implementation Method 1
Owing to an impact force applied to a lens frame, the lens holding frame and the support member relatively move in an axial direction of the shaft to come into face contact with each other
Implementation Method 2
The slant surface design effectively absorbs impact forces, reducing the likelihood of damage and deformation by distributing the force along the slant surfaces
Data Source
AI summary
There is disclosed a lens frame structure having a movable lens holding frame, a shaft which guides movement of the lens holding frame and a support member which supports the shaft. Owing to an impact force applied to a lens frame, the lens holding frame and the support member are able to relatively move in an axial direction of the shaft to come in face contact with each other. At least a part of regions of the lens holding frame and the support member which come in face contact with each other are slant surfaces with respect to the shaft.Otherwise, the regions of the lens holding frame and the support member which come in face contact with each other can be a pair of a concave surfaces and a convex surface (a wedge surface, a curved surface, a conical surface or the like) substantially parallel to each other.