Fine Concave-Convex Laminate for Camera Module Antireflection
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Solution Overview
Problem
Conventional antireflection films for display and camera devices are too thick and fail to adequately suppress scattering and absorption of short-wavelength light, leading to issues like color unevenness and ghosts in images.
Innovation Solution
A fine concave-convex laminate comprising a substrate, a first transparent organic layer with a fine concave-convex structure, and a second transparent organic layer with fine concave-convex structures at both surfaces, with a total thickness of 15 μm or less, and refractive index relationships that optimize antireflection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional antireflection film structure is used, then antireflection function is achieved, but the film thickness is too large (25 μm or more)
Solution Approach 1:
The patent divides the single thick antireflection film into multiple thin layers (first transparent organic layer and second transparent organic layer), each with specific thickness ranges (5-15 μm total). This segmentation allows achieving the required antireflection performance while reducing overall thickness to 15 μm or less, directly resolving the contradiction between thickness reduction and performance maintenance.
Solution Approach 2:
The patent optimizes specific parameters including the thickness of each layer, the pitch of fine concave-convex structures (0.5-5 μm), and refractive indices of materials. By carefully controlling these parameters, the patent achieves effective antireflection in a thinner overall structure, transitioning from conventional thick single-layer designs to thin multi-layer configurations.
2Reliability
If a cover film is mounted on the front of a sensor, then protection is provided, but light scattering and absorption increase, especially for short-wavelength light
Solution Approach 1:
The patent introduces fine concave-convex structures (microlens arrays with curved surfaces) on the cover film and intermediate layer. These curved microstructures focus and guide short-wavelength light effectively, reducing scattering and absorption while maintaining protection function. The microlens structure with specific curvature radii enables superior light transmission compared to flat conventional cover films.
Solution Approach 2:
The patent employs transparent organic layers with controlled porosity and fine concave-convex structures that create micro-channels and voids. These porous features reduce light scattering by providing gradual refractive index transitions and efficient light paths, particularly for short-wavelength light, while maintaining the protective barrier function.
3Length of stationary object
If the total film thickness is reduced to 15 μm or less, then thickness requirement is met, but forming the proper structure becomes more difficult
Solution Approach 1:
The patent segments the thin composite layer into distinct manufacturable components: a first transparent organic layer (5-10 μm) and a second transparent organic layer (5-10 μm), each with specific fine concave-convex structures. This segmentation enables separate fabrication and quality control of each layer before lamination, making the overall thin structure (15 μm or less) feasible to manufacture despite the complexity of the fine structures required.
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 laminate achieves reduced thickness, excellent antireflection performance, and suppression of short-wavelength light scattering and absorption, resulting in clear images without color unevenness or ghosts in camera module-mounted devices.
Implementation Method 1
a light incidence surface of a substrate such as a display plate or a lens tends to be subjected to antireflection treatment in order to prevent degradation in visibility and image quality (occurrence of color unevenness, ghosts, etc.) caused by reflection of external light. A conventionally known antireflection treatment method forms a fine concave-convex structure at the light incidence surface to reduce reflectivity.
Implementation Method 2
where n0 is a refractive index of the substrate in a visible light wavelength range, n1 is a refractive index of the first transparent organic layer in the visible light wavelength range, and n2 is a refractive index of the second transparent organic layer in the visible light wavelength range
Data Source
AI summary
Provided is a fine concave-convex laminate that is reduced in thickness, has excellent antireflection performance, and can suppress scattering and absorption of short-wavelength light. A fine concave-convex laminate comprises a substrate, a first transparent organic layer, and a second transparent organic layer laminated in the stated order, wherein the first transparent organic layer has a fine concave-convex structure at a surface facing the second transparent organic layer, the second transparent organic layer has fine concave-convex structures at both surfaces, and a thickness of a composite layer composed of the first transparent organic layer and the second transparent organic layer is 15 μm or less.