Optical System Edge Films for Ghosting and Flare Reduction
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Solution Overview
Problem
The outer peripheral surfaces of lenses in optical systems, particularly those parallel to the optical axis, are visually recognizable due to external light reflection, impairing the appearance and performance quality.
Innovation Solution
Applying a film with a light reflectivity of less than 30% on at least 50% of the edge surfaces of specific lens components within a defined range, adhering to certain conditional expressions to minimize visual recognition and internal reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a film with low light reflectivity is applied on edge surfaces of lens components, then the visual recognition of outer peripheral surfaces is reduced and appearance quality is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies the low-reflectivity film selectively to specific lens components (front lens components L1 and L2) rather than all lens components. The film is applied to the edge surfaces (outer peripheral surfaces parallel to the optical axis) of these specific components, achieving local improvement in appearance quality without unnecessary complexity. This selective application resolves the contradiction by focusing the anti-reflection treatment only where it provides visual benefit.
2Reliability
If a film with low light reflectivity is applied on edge surfaces of lens components, then internal surface reflection is suppressed and optical performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent implements anti-reflection treatment locally on specific lens components (L1 and L2) that are most prone to causing internal reflections and visual artifacts. By targeting only the edge surfaces of these front lens components with low F-number values, the patent achieves sufficient optical performance improvement without requiring complex manufacturing processes for the entire optical system.
Solution Approach 2:
The patent applies the low-reflectivity film to cover 50% or more of the total area of edge surfaces of the selected front lens components. This partial coverage (not necessarily 100% coverage of all surfaces) provides sufficient suppression of internal reflections and ghosting effects, achieving the desired optical performance while avoiding the complexity of complete surface treatment.
3Object-affected harmful factors
If the film coverage area on edge surfaces is increased, then the suppression of visual recognition and internal reflection is enhanced, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent specifies that the film should cover 50% or more of the total area of edge surfaces of the front lens components, but does not require 100% coverage. This partial coverage level provides sufficient suppression of internal reflections and visual artifacts while avoiding the excessive cost and complexity of complete surface treatment. The 50% threshold represents an optimized balance between performance and manufacturing feasibility.
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
Maintains a high-quality appearance and reduces ghosting and flaring while ensuring favorable optical performance, particularly in systems with small F-numbers and wide angles.
Implementation Method 1
a film having a light reflectivity of less than 30% is provided on 50% or more of a total area of the edge surfaces of all the front lens components
Data Source
AI summary
An optical system includes at least one lens component, in which in a case in which a distance, on an optical axis, from a lens surface of the optical system closest to an object side to a lens surface of the optical system closest to an image side is denoted by TD, and the lens component, in which at least a part of the lens component is located in a range of 0.3×TD from the lens surface of the optical system closest to the object side to the image side on the optical axis, among the lens components included in the optical system is defined as a front lens component, a film having a light reflectivity of less than 30% is provided on 50% or more of a total area of edge surfaces of all the front lens components.