Anti-reflective coating, optical element having the same, and optical device
The antireflection film with a refractive index changing layer and multiple interfaces addresses the challenge of material specificity in existing films, offering easy manufacturing and improved optical performance.
JP2026085914APending Publication Date: 2026-05-25CANON KK
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- CANON KK
- Filing Date
- 2026-02-25
- Publication Date
- 2026-05-25
AI Technical Summary
Technical Problem
Existing antireflection films require specific material compositions tailored to the substrate, limiting material selection freedom and complicating manufacturing.
Method used
An antireflection film design with a refractive index changing layer that satisfies specific conditions, allowing for a flexible choice of materials and improved manufacturing ease, using a structure with multiple interfaces to cancel reflected light.
Benefits of technology
The design provides easy manufacturing and effective antireflection performance across a wide range of wavelengths and angles, enhancing flexibility in material selection without compromising optical properties.
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Smart Images
Figure 2026085914000001_ABST
Abstract
To provide an anti-reflective coating that is easy to manufacture. [Solution] An anti-reflective film 100 formed on the optical surface of a substrate 200, having first to fourth layers arranged sequentially from the substrate 200 side, wherein the refractive index of the fourth layer 4 decreases as it moves away from the substrate 200, and when the refractive indices of the first to third layers at a wavelength of 550 nm are n1, n2, and n3 respectively, and the maximum refractive index of the fourth layer 4 at a wavelength of 550 nm is n4, then n1 > n2, n2<n3、n3> The condition n4 is satisfied.
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