Light emitting module including optical member that controls light distribution
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Solution Overview
Problem
Existing light emitting modules do not effectively broaden the light distribution in the long axis direction of optical members, limiting their application in achieving broader light distribution.
Innovation Solution
A light emitting module design featuring an optical member with a concave incident face and convex output face in the long axis cross section, and a flat incident face and convex output face in the short axis cross section, positioned to control light distribution, allowing for broader light emission in the long axis direction while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens is used to disperse light, then light distribution is achieved, but the light distribution in the long axis direction remains narrow
Solution Approach 1:
The optical member employs curved surfaces with specific radii of curvature to control light dispersion. The incident face has a first radius of curvature in the long axis direction and a second radius of curvature in the short axis direction, creating asymmetric curvature that broadens light distribution in the long axis direction while maintaining control in the short axis direction.
Solution Approach 2:
Different regions of the optical member have different optical properties through varying curvatures. The incident face has different radii of curvature for different directions (long axis vs short axis), allowing localized control of light distribution characteristics in different spatial directions to achieve broader overall distribution.
2Illumination intensity
If the optical member is positioned farther from the light source, then light distribution control is improved, but the minimum distance increases
Solution Approach 1:
The patent optimizes the radius of curvature parameters of the incident and output faces to achieve effective light distribution control at a minimized distance from the light source. By adjusting these curvature parameters, the optical member achieves broad light distribution without requiring excessive spacing from the LED chip.
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 module achieves a broader light distribution in the long axis direction, enhancing its application in areas such as sterilization and reducing mold growth in humid environments.
Implementation Method 1
an optical member configured to control a distribution of light emitted from the light source
Data Source
AI summary
A light emitting module includes: a light source; and an optical member configured to control a distribution of light emitted from the light source. The optical member comprises an incident face on which the light from the light source is incident, and an output face through which the light incident on the incident face exits. In a plan view: the optical member is shaped to have a long axis and a short axis orthogonal to the long axis, and a central axis of the optical member passes through a center of the light source, a center of the incident face, and a center of the output face, while being orthogonal to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis.