Lens Barrel Biasing Structure for Low-Stress Optical Positioning
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Solution Overview
Problem
Existing lens fixing methods cause surface distortion and optical performance deterioration due to stress, particularly when lenses are press-fitted or adhered to lens barrels, and they struggle to maintain accurate positioning without variations in pressing force.
Innovation Solution
An optical apparatus with a holding barrel and biasing barrel system using elastic members to bias the lens in both optical axis and orthogonal directions, incorporating movement limiting portions to stabilize the lens's position and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a lens is press-fitted or adhered to a lens barrel to fix it, then the lens is secured in position, but stress is applied to the lens causing surface distortion and optical performance deterioration
Solution Approach 1:
An elastic member is introduced as an intermediary between the lens and the pressing member. This elastic member absorbs and distributes the fixing stress, preventing direct stress application to the lens surface while maintaining secure positioning. The elastic member acts as a mediator that decouples the positioning function from the stress transmission function.
Solution Approach 2:
The invention changes the physical state and distribution parameters of the fixing force by using an elastic member. The stress is transformed from a concentrated, rigid force to a distributed, compliant force that adapts to the lens surface, thereby reducing surface distortion while maintaining positioning stability.
2Manufacturing precision
If a pressing member with elastic material is used to fix the lens, then lens surface distortion is suppressed, but the spring constant becomes extremely large and pressing force becomes large
Solution Approach 1:
The elastic member is designed with specific local properties including controlled elasticity, thickness, and material distribution. By optimizing these local parameters, the pressing force is distributed appropriately across the lens surface, achieving sufficient fixation while avoiding excessive force concentration that would cause distortion.
Solution Approach 2:
The elastic member provides dynamic compliance to the fixing system, allowing the pressing force to adapt to variations in lens positioning and surface geometry. This dynamic characteristic enables the system to maintain optimal pressing force without requiring an extremely large spring constant, as the elastic member can deform to accommodate minor misalignments.
3Manufacturing precision
If the lens is fixed with weak force to suppress distortion, then lens surface accuracy is maintained, but positioning accuracy deteriorates due to play between lens barrel and lens
Solution Approach 1:
The invention merges the positioning function and the stress absorption function into a single integrated system. The elastic member simultaneously provides positioning constraint and stress distribution, eliminating the need for separate weak fixing mechanisms that would allow play and position variation. This combined approach achieves both positioning accuracy and surface accuracy.
4Stability of the object's composition
If individual members are fixed with the same force, then consistent positioning is achieved, but it is not easy to fix each individual member with the same force without variation
Solution Approach 1:
The elastic member serves multiple functions simultaneously: it provides uniform pressing force distribution, absorbs positioning variations, and maintains consistent contact pressure across all lens members. This multi-functionality simplifies the assembly process by eliminating the need for precise individual force adjustment, as the elastic member automatically provides consistent positioning and stress distribution.
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 ensures high-accuracy positioning and reduces lens surface distortion, maintaining optical performance by applying controlled, balanced forces that minimize stress and prevent lens movement, even under impact.
Implementation Method 1
an elastic member that biases the biasing barrel toward the holding barrel
Data Source
AI summary
An optical apparatus including: an optical element; a holding barrel that holds the optical element; a biasing barrel that holds the optical element between the holding barrel and the biasing barrel; and an elastic member that biases the biasing barrel toward the holding barrel, in which the holding barrel includes a first and second receivers for positioning the optical element in an optical axis direction and in an optical axis orthogonal direction, respectively, in which the elastic member biases the biasing barrel to cause the optical element being pressed against the first and second receivers, and being held with respect to the holding barrel in the optical axis and orthogonal directions, and in which the optical apparatus includes a movement amount limiting portion that limits a relative movement amount between the biasing and holding barrels in the optical axis and orthogonal directions.