Optical element and method for manufacturing optical element
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Solution Overview
Problem
Conventional optical elements using transparent glass substrates and black resin have durability issues due to large differences in average linear expansion coefficients, leading to poor temperature stability.
Innovation Solution
Incorporating a glass-based light-shielding film within a transparent glass body to reduce the difference in average linear expansion coefficients between the glass body and the light-shielding film, thereby enhancing the optical element's durability against temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a black resin is used as the light-shielding film in conventional optical elements, then the manufacturing process is simple and成本低, but the durability against temperature change deteriorates due to large difference in average linear expansion coefficients between glass and resin
Solution Approach 1:
The invention changes the material parameter (average linear expansion coefficient) of the light-shielding film from resin to glass, matching the expansion coefficient of the glass substrate. This parameter change resolves the thermal expansion mismatch problem while maintaining the light-shielding function, thereby improving durability against temperature changes.
Solution Approach 2:
The invention creates a composite structure where a glass-based light-shielding film is integrated into a transparent glass body. By using glass for both the substrate and the light-shielding film, the composite material system achieves thermal compatibility while maintaining optical and mechanical properties.
2Ease of manufacture
If a transparent resin substrate is used instead of glass, then the manufacturing process is easier, but the optical characteristics change significantly with temperature
Solution Approach 1:
The invention changes the substrate material from resin to glass, fundamentally altering the thermal and optical stability parameters. Glass provides stable optical characteristics across temperature ranges while maintaining manufacturability through established glass processing techniques.
3Productivity
If glass substrate and black resin are combined, then the optical element can be manufactured, but the absolute value of average linear expansion coefficient difference is large causing low durability
Solution Approach 1:
The invention changes the expansion coefficient parameter of the light-shielding film to match the glass substrate by using glass-based materials. This eliminates the large parameter difference that causes durability issues while preserving the ability to manufacture optical elements with light-shielding regions.
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 use of a glass-based light-shielding film within a transparent glass body improves the optical element's durability by minimizing stress at the boundary lines, preventing breakage and maintaining structural integrity across varying temperatures.
Implementation Method 1
the absolute value of a difference between average linear expansion coefficients of a transparent glass body and a light-shielding film is small, durability of the optical element against a temperature change is improved
Data Source
AI summary
An optical element includes a transmission region that transmits a part of light and a light-shielding region that shields another part of the light when viewed from a transmission direction of the light. The optical element includes a transparent glass body and a light-shielding film made of glass that forms the light-shielding region inside the transparent glass body.