Light-Shielding Film Surface Contrast for Flare Ghost Control
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Solution Overview
Problem
Existing light-shielding films and members in camera modules struggle to effectively remove unnecessary lights, leading to flare ghost and contamination issues, and fail to distinguish front and back surfaces visually.
Innovation Solution
A light-shielding film with specific optical characteristics, including extremely low glossiness and reflectance, and a difference in optical density and L value between layers, to suppress flare ghost and facilitate visual differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a coating by aqueous ink is printed as a mark on the light-shielding layer to distinguish front and back surfaces, then visual distinction is achieved, but the coating falls off due to small stimuli such as contact, causing contamination
Solution Approach 1:
The patent applies color changes by creating a visual distinction between front and back surfaces through differences in glossiness (matte vs. glossy appearance) rather than using traditional aqueous ink coatings. This allows the light-shielding layer to maintain its light-shielding function while providing sufficient visual distinction for proper orientation during installation.
2Reliability
If glossiness degrees of both light-shielding layers are made to be less than 10% to eliminate contamination, then coating durability is improved, but unnecessary light cannot be removed sufficiently, causing flare ghost
Solution Approach 1:
The patent applies local quality by creating different surface properties (glossiness) at different locations (front vs. back surfaces) of the light-shielding member. One surface has glossiness of 10% or less while the other has glossiness of 10% or more, allowing each surface to fulfill its specific function: the matte surface prevents flare ghost by blocking unnecessary light, while the glossy surface provides visual distinction for orientation.
3Reliability
If no mark is printed on the light-shielding layer to avoid contamination, then coating durability is improved, but visual distinction between front and back surfaces is lost
Solution Approach 1:
The patent uses glossiness changes (matte vs. glossy appearance) as an alternative to traditional markings to provide visual distinction. This allows the light-shielding layer to remain free of contaminating coatings while still providing sufficient visual information for proper orientation during installation.
4Loss of information
If the light-shielding layer has high glossiness to provide visual distinction, then front and back surfaces can be distinguished, but unnecessary light reflection increases, causing flare ghost
Solution Approach 1:
The patent applies local quality by assigning different glossiness characteristics to different surfaces of the light-shielding member. The surface that contacts the lens assembly (front surface) has low glossiness (10% or less) to minimize light reflection and prevent flare ghost, while the opposite surface (back surface) has high glossiness (10% or more) to provide visual distinction for orientation during installation.
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 solution effectively reduces flare ghost and allows for clear visual distinction between front and back surfaces, enhancing image quality in camera modules.
Implementation Method 1
a light-shielding layer containing carbon black, lubricant, fine particles and a binder resin
Implementation Method 2
a light-shielding member for removing unnecessary lights
Data Source
AI summary
A light-shielding film wherein front and back thereof can be distinguished visually. A glossiness degree against a light having an incident angle of 60° is (A), reflectance against a light having a wavelength of 550 nm is (B) and an L value in CIELAB color space system by the SCE method is (C). A light-shielding film is for obtaining a light-shielding member includes at least a first and a second light-shielding layer in which an outermost surface of each of the layers have the (A), (B) and (C) of 2% or less, 4.5% or less and 26 or less, respectively. Between the outermost surface of the first light-shielding layer and the outermost surface of the second light-shielding layer, a difference of (C) is 4 or more and a difference of optical densities are 0.5 or more and 1.5 or less.