Lens Apparatus Air Gap Thermal Insulation
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Solution Overview
Problem
Existing lens apparatuses face challenges in maintaining optical performance stability due to temperature changes, particularly in high-temperature environments, where materials with positive temperature coefficients of refractive index can lead to increased spherical aberration and optical characteristic shifts.
Innovation Solution
The lens apparatus incorporates a holding mechanism with an air gap between the lens holding barrel and exterior barrel, utilizing materials with negative temperature coefficients for positive lenses and appropriate Abbe constants to minimize thermal expansion and aberration, while maintaining a balanced refractive power and dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat insulating member is disposed between the light source and lens unit to reduce thermal expansion, then thermal insulation is improved, but device size and cost increase
Solution Approach 1:
Air gaps are introduced as intermediary spaces between lens components and the lens barrel to block heat conduction paths. The air gaps serve as thermal insulation mediators without requiring additional heat insulating member components, thus achieving thermal insulation while avoiding increases in device size and complexity
Solution Approach 2:
The patent extracts the thermal insulation function from separate heat insulating members and integrates it directly into the lens barrel structure through air gaps. This eliminates the need for additional insulating components while maintaining the thermal insulation effect
2Adaptability or versatility
If lenses are used in high-temperature environments, then adaptability is improved, but optical characteristics change due to thermal expansion
Solution Approach 1:
Air gaps are strategically positioned at specific locations where heat conduction would most affect optical characteristics, particularly near the positive lens with negative temperature coefficient. This localized thermal insulation approach maintains optical stability in high-temperature environments without requiring complete insulation of the entire lens system
Solution Approach 2:
The patent utilizes materials with negative temperature coefficients for positive lenses and carefully selects Abbe constants to compensate for thermal effects. By changing material parameters and leveraging the air gap configuration, the system maintains stable optical characteristics across temperature variations
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 configuration effectively reduces temperature-induced changes in optical performance, minimizing spherical aberration and chromatic aberration, and maintains a compact lens apparatus size by strategically placing air gaps to reduce heat conduction.
Implementation Method 1
the holding member and the exterior member are disposed so as to be separated from each other with an air gap therebetween in a region between the first plane and the second plane
Implementation Method 2
the temperature coefficient of a refractive index of the material of the positive lens Gp has a negative value
Data Source
AI summary
A lens apparatus that includes an optical system including a positive lens, the lens apparatus including a holding member arranged to hold the positive lens, an exterior member arranged to accommodate the holding member, and an engaging mechanism arranged to engage the holding member and the exterior member to each other.