Optical Lens Assembly With Multilayer Film for Stray Light Control
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Solution Overview
Problem
Existing optical lens assemblies in electronic devices struggle to balance appearance quality with image quality, as they often suffer from stray light affecting image quality while lacking aesthetic appeal.
Innovation Solution
The optical lens assembly incorporates a light blocking sheet with a first film layer formed by alternately stacked high and low refractive index layers, which is designed to minimize stray light and enhance appearance recognition by controlling reflectivity and color distribution within specific CIE 1976 L*a*b* color space parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking sheet is added to reduce stray light, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent introduces a light blocking sheet as an intermediary component between the lens elements and the image sensor. This sheet contains light absorbing portions that block stray light paths without interfering with the main optical axis, effectively reducing stray light while maintaining a relatively simple overall structure.
Solution Approach 2:
The light blocking sheet features local quality variations through its light absorbing portions that are strategically positioned to block specific stray light paths. The sheet has different optical properties in different regions - transparent areas allow main light paths while light absorbing portions block stray light, achieving targeted stray light reduction without complicating the entire optical system.
2Shape
If a film layer with specific reflectivity control is applied, then appearance quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies a film layer on the light blocking sheet that is designed to reflect specific wavelengths of light (with reflectivity between 2.2% and 4.8% in the 450-550nm range). This creates a controlled color effect that enhances appearance quality. The film layer's optical properties are carefully engineered to produce the desired visual appearance while the manufacturing process controls the reflectivity within specified tolerances.
3Reliability
If multiple lens elements are used to improve image quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent divides the optical system into distinct segments: multiple lens elements for focusing and image quality, a light blocking sheet for stray light control, and a film layer for appearance enhancement. Each segment performs its specific function independently, allowing the lens elements to be optimized for optical performance without being burdened by the complexity of stray light management and appearance control.
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 design improves both image quality by reducing stray light and enhances the visual appeal of the optical lens assembly through controlled reflectivity and color coordination, resulting in a unique visual experience.
Implementation Method 1
A first film layer is disposed on the object-side surface and formed by high and low refractive index layers alternately stacked
Implementation Method 2
a reflected light is obtained from the first film layer irradiated by a standard illuminant D65
Implementation Method 3
A first film layer is disposed on the object-side surface and formed by high and low refractive index layers alternately stacked
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An optical lens assembly includes a lens barrel and an optical lens group. The lens barrel includes a light entering hole, which is configured for allowing a light to enter the lens barrel. The lens barrel accommodates the optical lens group, and an optical axis passes through the optical lens group. The optical lens group includes a plurality of lens elements and at least one light blocking sheet. The light blocking sheet is an opaque sheet-shaped element and surrounds the optical axis to form a light passing hole. The light blocking sheet includes an object-side surface and an image-side surface, and the object-side surface is located more adjacent to the light entering hole than the image-side surface thereto. A first film layer is disposed on the object-side surface.