Surface Illuminating Light Source Device with Reflection Section
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Solution Overview
Problem
Existing surface illuminating light source devices struggle to achieve uniform light distribution over a wide area without increasing the thickness in the light radiation direction, as they either require large spaces, absorb light, or reduce light intensity through multipath reflection.
Innovation Solution
A surface illuminating light source device featuring a group of point-light sources, an optically transmissive light guide body, and a casing with inner and radiation side reflection units, where the radiation side reflection unit has an opening section that increases in area farther from the center and is designed to reflect light efficiently, using ultrafinely foamed reflection plates and non-through holes to adjust light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide body with local lens array is used to uniformize light distribution, then uniform light distribution is achieved, but the device complexity increases and requires precise lens fabrication
Solution Approach 1:
The invention extracts the light uniformization function from complex lens arrays and implements it through a simple reflective structure. The reflection section with specific geometric shape (parallel sides) and positioning (at 45 degrees to light incidence) alone achieves uniform light distribution without requiring precise lens fabrication, thus reducing device complexity while maintaining the uniform illumination effect.
Solution Approach 2:
The invention replaces the optical lens system (refractive mechanism) with a reflective system using a reflection section. Instead of using a local lens array to control light paths through refraction, the patent uses a geometric reflection structure to redirect light, achieving the same uniform distribution effect with simpler manufacturing and lower device complexity.
2Illumination intensity
If multiple reflection paths are used to uniformize light, then uniform illumination is achieved, but light intensity is reduced due to multiple reflections
Solution Approach 1:
The invention segments the reflection process into a single, optimized reflection event at the reflection section rather than multiple scattered reflections. By positioning the reflection section at 45 degrees and using parallel sides, the light undergoes one controlled reflection to achieve uniform distribution, avoiding the energy loss associated with multiple random reflections while maintaining illumination uniformity.
3Illumination intensity
If a large space is provided for light propagation, then uniform light distribution is achieved, but the device size increases
Solution Approach 1:
The invention changes the spatial arrangement by positioning the reflection section at a specific angle (45 degrees) relative to the light incidence direction. This angular positioning allows the light to be redirected efficiently across the light guide body without requiring a large propagation space, achieving uniform distribution in a compact configuration by utilizing directional reflection rather than random scattering.
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 configuration allows for uniform illuminating light at a prescribed distance from the radiation surface while efficiently using light from the source without increasing thickness, ensuring consistent light distribution across the area.
Implementation Method 1
an optically transmissive light guide body propagating light from the light source
Implementation Method 2
inner reflection unit formed of a bottom surface and a side reflection section that reflect light
Implementation Method 3
radiation side reflection unit arranged on the radiation surface. The radiation side reflection unit is formed of a member that reflects or passes light propagating inside the light guide body at a prescribed rate
Data Source
AI summary
Uniform illuminating light is obtained on a surface at a prescribed distance from a radiation surface without increasing the thickness in a light radiation direction by using the light from the light source highly efficiently. A surface illuminating light source device is provided with a light source for radiating light; a light guide body propagating light from the light source and having a radiation surface at a prescribed position in the radiation direction; a casing closing the light guide body except the radiation surface and having the light source arranged substantially at the center; an inner reflection section arranged between the casing and the light guide body and having a reflection surface which reflects light propagating inside the light guide body; and a radiation side reflection section having an outer reflection section which is arranged on the radiation surface and has a reflection surface that reflects light propagating inside the light guide body at a prescribed rate and an opening section which is formed on the outer reflection section and through which reflection light reflected at least once on one of the reflection surfaces among the light from the light source passes.