Light Emitting Module Cover with Segmented Optical Films
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Solution Overview
Problem
Existing light emitting modules struggle to reduce stray light on the irradiation surface, which affects the efficiency and clarity of light emission.
Innovation Solution
A light emitting module design that includes a light source, a lens to transmit light, and a cover member with specific regions for light diffusion and absorption, where the cover member has a first region, a second region with higher light diffusion effect, and a third region for incident light, effectively reducing stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional cover member with uniform structure is used, then the manufacturing process is simple, but stray light cannot be effectively reduced on the irradiation surface
Solution Approach 1:
The cover member is divided into multiple functional regions: a first region with a light diffusion film for diffusing light, a second region with a light absorbing film for absorbing stray light, and a third region that is transparent. This segmentation allows each region to perform its specific function, effectively reducing stray light while maintaining manufacturing feasibility through region-specific material application.
Solution Approach 2:
Different portions of the cover member are assigned different optical properties: the first region has light diffusion capability, the second region has light absorption capability, and the third region has light transmission capability. This local differentiation of properties enables precise control over light behavior in different areas, reducing stray light without requiring complete structural redesign of the entire cover member.
2Object-affected harmful factors
If light diffusion effect is increased to reduce stray light, then stray light is reduced, but the clarity of the desired light beam is compromised
Solution Approach 1:
By separating the light diffusion function (first region) from the light absorption function (second region), the patent ensures that light diffusion is applied only where needed to control stray light, while the third transparent region maintains clear light transmission. This segmentation prevents over-diffusion that would compromise beam clarity.
Solution Approach 2:
The light absorbing film in the second region acts as an intermediary element that selectively removes stray light without affecting the main light beam. This mediator approach allows the light diffusion film in the first region to perform its diffusion function while the absorbing film cleans up the stray light, preserving overall light beam clarity.
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 proposed design significantly reduces stray light on the irradiation surface, enhancing the clarity and efficiency of light emission by ensuring that light is directed to the desired region while minimizing unwanted light dispersion.
Implementation Method 1
a light diffusion film provided on a lower surface of the cover member in the first region
Implementation Method 2
a light absorbing film provided on an upper surface of the cover member in the second region
Data Source
AI summary
A light emitting module includes: a light source including a plurality of light emitting parts that are configured to be turned on individually or configured to be turned on in groups of multiple light emitting parts; and a cover member disposed over the light source and configured to transmit light from the light source, the cover having an upper surface that includes a flat surface portion. The cover member includes, in a top view: a first region, a second region located around the first region, wherein a light diffusion effect of the second region is higher than a light diffusion effect of the first region, and a third region located inward of the first region and on which the light from the light source transmitted through the light from the light source is incident.