Lens Module Adhesive Elastic Modulus Compensation
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Solution Overview
Problem
The focal length of imaging apparatus lenses varies with temperature due to changes in refractive index, leading to performance degradation, and existing solutions require additional components to compensate for this change, increasing the parts count.
Innovation Solution
A lens module with a first and second lens assembly, where the first adhesive has a higher elastic modulus than the first lens and the second adhesive has a lower elastic modulus, interposed between the lenses and a holder, allowing the effects of refractive index changes and thermal deformation to cancel each other out, thus maintaining focal length stability without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens-holding plate is added to compensate refractive index change, then focal length stability is improved, but parts count increases
Solution Approach 1:
The patent combines the refractive index compensation function and the lens holding function into a single integrated lens holder structure. The lens holder is made of a material with specific thermal expansion characteristics that compensate for the lens's refractive index change, eliminating the need for a separate lens-holding plate and reducing the parts count while maintaining focal length stability.
Solution Approach 2:
The lens holder is designed to serve multiple functions simultaneously: it holds the lens in position and provides thermal compensation for refractive index changes. By making the lens holder material have a thermal expansion coefficient that compensates for the lens's refractive index temperature dependence, the structure achieves both mechanical support and optical compensation functions in one component.
2Manufacturing precision
If adhesive with high elastic modulus is used, then lens positioning precision is improved, but thermal deformation compensation is reduced
Solution Approach 1:
The patent applies different adhesive materials with different elastic moduli at different locations (first and second surfaces) of the lens. The first adhesive with higher elastic modulus provides strong bonding and precise positioning on one surface, while the second adhesive with lower elastic modulus allows thermal deformation compensation on the other surface, optimizing both positioning precision and thermal stability locally.
Solution Approach 2:
The patent changes the elastic modulus parameter of the adhesive material between the first and second surfaces of the lens. By selecting adhesives with different elastic modulus values for different surfaces, the system achieves both precise lens positioning (through the higher modulus adhesive) and thermal deformation compensation (through the lower modulus adhesive) simultaneously.
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
This solution effectively compensates for temperature-induced changes in refractive indices and deformation, reducing focal length variations and maintaining image quality across temperature extremes without adding extra parts to the imaging apparatus.
Implementation Method 1
the linear expansion coefficient of the lens being larger than that of the lens-holding plate so that the refractive index change due to the temperature change of the lens is compensated utilizing the difference in linear expansion coefficient between the lens-holding plate and the lens
Implementation Method 2
a first adhesive that adheres the first lens to the holder, an elastic modulus of the first adhesive being larger than an elastic modulus of the first lens; and a second adhesive that adheres the first lens to the holder, an elastic modulus of the second adhesive being smaller than the elastic modulus of the first lens
Data Source
AI summary
A lens module for an imaging apparatus includes a lens assembly including a first lens and a second lens, a holder holding the lens assembly, a first adhesive that adheres the first lens to the holder, an elastic modulus of the first adhesive being larger than an elastic modulus of the first lens, and a second adhesive that adheres the first lens to the holder, an elastic modulus of the second adhesive being smaller than the elastic modulus of the first lens. The first adhesive is interposed between one surface of the first lens and the holder and the second adhesive is interposed between the other surface of the first lens and the holder.