Lens Support Structure for Optical Axis Alignment Under Adhesive Shrinkage
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Solution Overview
Problem
Conventional lens adjustment methods lead to distortion due to holding forces or adhesive curing shrinkage, particularly in resin lenses, affecting optical axis accuracy.
Innovation Solution
A lens design with a distortion absorbing portion in the outer peripheral part that deforms more readily than the lens main body, combined with a lens support structure using a cylindrical lens frame, an annular auxiliary frame, and adhesives to fix the lens, absorbing external forces and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the outer peripheral part of the lens is held by adjustment arms for moving the lens precisely, then the lens can be adjusted accurately, but the lens may be distorted by the holding force
Solution Approach 1:
The lens is divided into two functional regions: a lens main body portion that maintains shape stability for optical precision, and an outer peripheral part that can deform to absorb holding forces from adjustment arms, preventing distortion of the main body
Solution Approach 2:
Different parts of the lens have different mechanical properties: the lens main body is designed with high rigidity to maintain optical shape, while the outer peripheral part is designed with lower rigidity to absorb deformation forces, creating a gradient of mechanical properties from center to edge
2Strength
If the lens is fixed to the lens frame with an adhesive, then the lens can be securely mounted, but the lens may be distorted due to curing shrinkage of the adhesive
Solution Approach 1:
The lens structure separates the mounting function (outer peripheral part) from the optical function (lens main body), allowing the peripheral part to absorb adhesive shrinkage forces without transmitting them to the main body
Solution Approach 2:
The outer peripheral part acts as an intermediary between the adhesive and the lens main body, absorbing the shrinkage forces from the adhesive before they can reach and distort the optical portion of the lens
3Ease of manufacture
If a resin lens is used instead of a glass lens, then the lens can be molded with complex shapes and reduced weight, but the lens distortion is particularly pronounced under external forces
Solution Approach 1:
The resin lens is designed with spatially varying rigidity: the lens main body maintains high rigidity for shape stability, while the outer peripheral part has reduced rigidity to absorb deformation forces, compensating for the inherently lower rigidity of resin material
Solution Approach 2:
The lens functions as a composite structure combining a rigid lens main body for optical performance and a more compliant outer peripheral part for force absorption, effectively creating a multi-functional composite lens system
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
Accurately adjusts the optical axis by minimizing distortion from external factors, ensuring precise lens alignment.
Implementation Method 1
a distortion absorbing portion that is provided to the outer peripheral part of the lens main body and deforms more readily than the lens main body
Implementation Method 2
The first adhesive portion adhesively fixes the outer peripheral part of the lens main body and a part of the inner peripheral part of the auxiliary frame. The second adhesive portion adhesively fixes the outer peripheral part of the auxiliary frame and a part of the inner peripheral part of the lens frame.
Data Source
AI summary
It is an object of the present disclosure to provide a lens with which lens distortion attributable to an external factor can be suppressed and the optical axis of the lens can thereby be accurately adjusted, as well as a lens support structure, a lens barrel provided with this, and a camera. A lens 150 comprises a lens main body 151 that transmits light, and a distortion absorbing portion 151a that is provided to the outer peripheral part of the lens main body 151 and deforms more readily than the lens main body 151.