Optical Element Laminated Substrates Phase Deviation
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Solution Overview
Problem
Existing optical elements with reflective and partially reflective layers suffer from uneven intervals between layers, leading to phase deviations and reduced light intensity due to differing optical path lengths, resulting in uneven optical intensity distribution.
Innovation Solution
The optical element is configured with light-transmissive substrates having reflective and partially reflective layers formed on their surfaces, ensuring equivalent intervals between layers, which are laminated parallel to each other, aligning optical path lengths and phases of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If substrates are laminated using adhesive layers, then the manufacturing process is simplified, but the intervals between reflective layers become non-equivalent causing phase deviations
Solution Approach 1:
The adhesive layers are completely removed from the optical element structure. Instead of using adhesive layers to bond substrates, the patent employs direct mechanical fitting or alternative bonding methods that do not introduce variable thickness layers, thereby eliminating the source of interval non-equivalence while maintaining manufacturing feasibility
Solution Approach 2:
The patent introduces precision spacer elements or positioning structures as intermediaries between substrates during assembly. These spacers ensure precise spacing and alignment, guaranteeing equivalent intervals between reflective layers on both sides of the laminated body while facilitating the manufacturing process
2Device complexity
If different intervals between reflective layers are used, then the device complexity is reduced, but optical path lengths differ causing uneven optical intensity distribution
Solution Approach 1:
The patent employs asymmetric positioning of the partially reflective layer relative to the reflective layers on opposite sides. By strategically placing the partially reflective layer at a specific position within the laminated body, the design achieves equivalent optical path lengths for light reflecting off either reflective layer, thereby ensuring uniform optical intensity distribution while maintaining relatively simple device structure
Solution Approach 2:
The patent designs the optical system such that both light paths (through first and second reflective layers) achieve equivalent optical path lengths, creating an equipotential optical condition. This ensures that light waves returning from different reflective layers remain in phase, producing uniform optical intensity distribution across the emission surface
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 maintains consistent optical intensity distribution by ensuring equivalent intervals between reflective and partially reflective layers, preventing phase deviations and enhancing light intensity.
Implementation Method 1
proceeds in the direction T, which intersects the lamination direction S, while repeating total reflection by the first reflective layer 13, total reflection by the second reflective layer 14
Implementation Method 2
transmission through the partially reflective layer 11, and reflection by the partially reflective layer 11
Data Source
AI summary
A light-transmissive layer and a partially reflective layer are mutually laminated in a luminous flux diameter enlargement element. When manufacturing the luminous flux diameter enlargement element, a light-transmissive first substrate, on which a first reflective layer is formed on a first surface, a light-transmissive second substrate, on which a first partially reflective layer is formed on a first surface, and which is formed so as to have equivalent thickness to the first substrate, and a third substrate, on which a second reflective layer is formed on a first surface, are laminated toward the same direction as a lamination direction of the respective first surfaces.