Dielectric Multilayer Film Angle Limiting Filter for Close Contact Imaging
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Solution Overview
Problem
Existing close contact imaging devices face challenges in achieving high-definition images due to light incidence issues, requiring complex and costly components like cylindrical rod lenses or filters with minute holes, which are difficult to fabricate and align, leading to increased production costs and reduced mass productivity.
Innovation Solution
The use of a dielectric multilayer film on a transparent substrate that acts as a band pass filter, selectively transmitting perpendicularly incident light while shielding obliquely incident light, thereby limiting the incident angle and improving image quality without the need for precise alignment or complex fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cylindrical rod lens is used to limit light incidence, then image quality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the light-limiting function from complex optical components (rod lenses, grid plates) and implements it through a simplified substrate structure with controlled light transmission properties, eliminating the need for precise alignment and complex fabrication
Solution Approach 2:
The patent changes the physical parameters of the substrate (material composition, thickness, light transmission characteristics) to achieve the desired light incidence control, replacing mechanical/optical components with material property control
2Manufacturing precision
If a filter with minute holes is used to divide light acceptance areas, then image quality is improved, but manufacturing precision and production cost increase
Solution Approach 1:
The patent replaces expensive, difficult-to-manufacture filters with minute holes with a cost-effective substrate that achieves the same light control function through material properties and simple structure, enabling mass production
Solution Approach 2:
The patent substitutes the mechanical filter structure (physical holes and barriers) with a substrate whose material properties and geometry inherently control light transmission, eliminating the need for precise hole fabrication and alignment
3Manufacturing precision
If rod lenses or filters are used to limit incident angle, then image quality is improved, but assembly space and alignment requirements increase
Solution Approach 1:
The substrate itself provides the light incidence control function through its inherent structural and material properties, eliminating the need for separate alignment components and complex assembly procedures
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 enables mass production of close contact imaging devices with reduced fabrication costs and assembly space requirements, while ensuring that light from a particular point on the object corresponds to one imaging area, resulting in high-definition images.
Implementation Method 1
a dielectric multilayer film provided on the substrate, wherein the dielectric multilayer film transmits light within a particular wavelength range which is approximately perpendicularly incident onto a surface of the substrate, and shields light within a particular wavelength range which is obliquely incident onto the surface
Data Source
AI summary
A close contact type imaging device is an imaging device for acquiring an image of an object in a state that the object is in close contact to an image sensor. This imaging device has an angle limiting filter. The angle limiting filter is constructed from: a glass substrate of a parallel plate; and a dielectric multilayer film provided on the glass substrate. This angle limiting filter transmits light within a particular wavelength range approximately perpendicularly incident onto the surface, and shields light outside the particular wavelength range and light within the particular wavelength obliquely incident onto the surface.