Light-Shielding Film Surface Contrast for Flare Ghost Suppression
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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 on outermost surfaces, and a difference in optical properties between layers to facilitate visual differentiation and reduce flare ghost.
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 during transfer or incorporation
Solution Approach 1:
The patent applies color changes by creating a visible mark on the light-shielding layer that provides visual distinction between front and back surfaces. The mark is designed to be visible to the naked eye, allowing operators to correctly identify the orientation during assembly without requiring additional markings or complex identification systems.
2Object-generated harmful factors
If glossiness degrees of both light-shielding layers are made less than 10% to eliminate contamination, then contamination is reduced, but unnecessary lights cannot be removed sufficiently causing flare ghost
Solution Approach 1:
The patent applies local quality by creating a visible mark on only one of the two light-shielding layers. This allows the mark to provide visual distinction functionality while the other layer maintains its light-shielding properties without the mark, thereby preventing contamination from the mark while still enabling sufficient light blocking to prevent flare ghost.
3Object-generated harmful factors
If no mark is printed on the light-shielding layer to avoid contamination, then contamination is eliminated, but front and back surfaces cannot be distinguished visually
Solution Approach 1:
The patent applies local quality by creating a visible mark on only one of the two light-shielding layers. This allows the mark to provide visual distinction functionality while the other layer maintains its light-shielding properties without the mark, thereby preventing contamination from the mark while still enabling sufficient light blocking to prevent flare ghost.
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 suppresses 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
the respective outermost layer surfaces of the first light-shielding layer and the second light-shielding layer have a plurality of predetermined optical characteristics (extremely low glossiness of 2% or less and a low reflectance of 4.5% or less)
Data Source
AI summary
A light-shielding film capable of suppressing flare ghost, 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), an L value in CIELAB color space system by the SCE method is (C) and an optical density (OD) is (D) here. The light-shielding film includes at least first and second light-shielding layers wherein an outermost surface formed with each of the layers have the (A), (B), (C) and (D) of 2% or less, 4.5% or less, 26 or less and 1.0 or more, respectively. Between the outermost surface of the first light-shielding layer and the outermost surface of the second light-shielding layer, a difference of (B) and a difference of (C) are 2% or less and 4 or more, respectively.