Lens Support Structure With Auxiliary Frame for Optical Axis Accuracy
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Solution Overview
Problem
Conventional lens adjustment methods lead to lens distortion due to holding forces or adhesive curing shrinkage, particularly in resin lenses, affecting optical axis accuracy.
Innovation Solution
A lens support structure with a distortion absorbing portion in the outer peripheral part of the lens main body, comprising a lens frame, an auxiliary frame, and adhesives that allow the auxiliary frame to deform more readily than the lens main body, absorbing external forces and adhesive shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the outer peripheral part of the lens is held by adjustment arms for precise moving, then the lens can be adjusted accurately, but the lens may be distorted by the holding force
Solution Approach 1:
The lens structure is divided into a lens main body and a separate distortion absorbing portion (auxiliary frame) that is adhesively fixed to the lens frame. This segmentation allows the distortion absorbing portion to bear the holding forces from adjustment arms, preventing these forces from being transmitted to the lens main body and causing distortion.
Solution Approach 2:
The distortion absorbing portion acts as an intermediary element between the lens main body and the external adjustment mechanism. It absorbs and isolates the holding forces applied during optical axis adjustment, preventing direct transmission of these forces to the lens main body while still allowing precise adjustment to occur.
2Strength
If the lens is fixed to the lens frame with adhesive, then the lens can be securely mounted, but the lens may be distorted due to adhesive curing shrinkage
Solution Approach 1:
The mounting structure is segmented into three distinct components: the lens main body, the distortion absorbing portion (auxiliary frame), and the lens frame. Adhesives are applied only at the interfaces between these components (first adhesive portion between lens and auxiliary frame, second adhesive portion between auxiliary frame and lens frame), allowing the distortion absorbing portion to compensate for adhesive shrinkage forces.
Solution Approach 2:
The potential harmful effect of adhesive curing shrinkage is converted into a beneficial function. The distortion absorbing portion is designed to deform in response to adhesive shrinkage forces, and this deformation is harnessed to absorb the harmful effects of shrinkage before they can reach the lens main body, thereby protecting lens precision while maintaining secure mounting.
3Ease of manufacture
If a resin lens is used instead of glass lens, then the lens can be manufactured more easily and at lower cost, but lens distortion is particularly pronounced
Solution Approach 1:
Different parts of the lens system are given different properties: the lens main body maintains high dimensional stability for optical precision, while the distortion absorbing portion (auxiliary frame) is designed with lower rigidity to allow controlled deformation. This local differentiation of mechanical properties allows resin lenses to be used while minimizing distortion effects.
Solution Approach 2:
The resin material's tendency to deform under stress is converted into a beneficial feature. The distortion absorbing portion utilizes the viscoelastic properties of resin to absorb and dissipate deformation forces through controlled creep and relaxation, converting what would be harmful distortion into a damping mechanism that protects the lens main body.
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 lens distortion from external factors, ensuring precise alignment.
Implementation Method 1
the lens may be distorted due to the curing shrinkage of the adhesive
Implementation Method 2
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
Data Source
AI summary
A lens support structure includes a lens main body, a substantially cylindrical lens frame that holds the lens main body on a side of an inner peripheral surface, and a substantially annular auxiliary frame that is provided between an outer peripheral part of the lens main body and the inner peripheral surface of the lens frame and that has, at least partially, a distortion absorbing portion that deforms more readily than the lens main body. A first adhesive portion adhesively fixes the outer peripheral part of the lens main body and a part of an inner peripheral part of the auxiliary frame, and a second adhesive portion adhesively fixes the outer peripheral part of the auxiliary frame and a part of an inner peripheral part of the lens frame.