LED Flash Lens Unit Preventing Yellow Bands
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Solution Overview
Problem
LED flash lenses using phosphor-coated blue LEDs often result in yellow bands or rings, leading to decreased white light intensity and inaccurate color representation in photography.
Innovation Solution
An LED flash lens unit with a first lens surface having reflective and transmissive portions, a beam scatter device with designated peaks and valleys to scatter yellow light, and a second lens surface for concentration, preventing yellow bands or rings by optimizing light refraction and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a condensing lens is installed to improve light concentration, then light concentration is improved, but yellow bands or yellow rings occur
Solution Approach 1:
The first lens surface is segmented into reflective portions and transmissive portions, where reflective portions reflect LED light at angles greater than a designated angle and transmissive portions transmit LED light at angles not more than the designated angle. This segmentation prevents yellow bands or yellow rings while maintaining light concentration.
Solution Approach 2:
Different portions of the first lens surface have different optical properties: reflective portions have high reflectivity for oblique incident light, while transmissive portions have high transmissivity for near-axial light. The beam scatter device is selectively positioned at transmissive portions to scatter yellow light, creating local quality variations that eliminate yellow bands while preserving light concentration.
2Object-affected harmful factors
If a beam scatter device is added to scatter yellow light, then yellow bands or yellow rings are prevented, but device complexity increases
Solution Approach 1:
The beam scatter device is merged with the transmissive portion of the first lens surface, forming an integrated structure where the beam scatter device and lens surface work together as a unified optical element. This merging reduces the number of separate components and simplifies manufacturing while maintaining the function of scattering yellow light.
Solution Approach 2:
The beam scatter device acts as an intermediary element positioned at the transmissive portion of the first lens surface, mediating between the incoming LED light and the second lens surface. It selectively scatters yellow light while allowing other wavelengths to pass through, preventing yellow bands without interfering with the overall light concentration function.
3Illumination intensity
If the first lens surface is designed with reflective and transmissive portions, then light concentration is improved without yellow bands, but manufacturing precision requirements increase
Solution Approach 1:
The first lens surface is designed with specific geometric parameters including a designated angle that distinguishes between reflective and transmissive portions. By optimizing parameters such as the designated angle, the reflective/transmissive boundary geometry, and the beam scatter device configuration, the patent achieves effective light concentration without yellow bands while maintaining manufacturability within standard precision tolerances.
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 concentrates LED light without yellow bands or rings, enhancing light efficiency and maintaining the inherent colors of objects, achieving high-quality photography.
Implementation Method 1
a first lens surface including reflective portions to reflect the LED light if the angle of the LED light passing through the front end of the LED is more than a designated angle, and a transmissive portion to transmit the LED light if the angle of the LED light is not more than the designated angle
Implementation Method 2
a second lens surface to concentrate the LED light reflected or transmitted by the first lens surface
Implementation Method 3
a beam scatter device located at the transmissive portion of the first lens surface and provided with at least one form having a designated peak and a designated valley to scatter yellow light from among the LED light
Data Source
AI summary
Disclosed herein is an LED flash lens unit which prevents occurrence of yellow bands or yellow rings if LED light is concentrated through an LED flash lens improving manufacturing ability and mass production to have high performance and high efficiency.