Lens Unit Optical Member for LED Axis Deviation Compensation
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Solution Overview
Problem
Existing light emitting units face issues with light source deviation from the optical axis of the lens when the lens is disposed away from the substrate, leading to potential degradation in optical characteristics and aesthetic appearance.
Innovation Solution
A light emitting unit design that includes a substrate with a light source and a lens unit featuring an optical member with distinct regions, where the first region has higher light transmittance or diffusivity than the second region, allowing for reduced influence of deviation between the light source and the lens optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lens is disposed away from the substrate, then the device structure is more flexible and easier to manufacture, but the light source may deviate from the optical axis of the lens causing optical unevenness
Solution Approach 1:
An optical member is introduced as an intermediary component between the light source and the lens. This optical member includes a first region with higher light transmittance positioned at the optical axis and a second region with lower light transmittance positioned away from the optical axis. The optical member compensates for the deviation caused by separating the lens from the substrate, thereby maintaining optical alignment precision while allowing manufacturing flexibility.
Solution Approach 2:
The optical member is designed with spatially varying light transmittance properties: the first region has higher light transmittance to compensate for light intensity reduction at the optical axis, while the second region has lower light transmittance to reduce the effect of off-axis light. This local quality variation corrects optical unevenness without requiring precise alignment between the light source and lens.
2Ease of operation
If the lens is disposed away from the substrate, then assembly is easier, but the aesthetic appearance and optical characteristics are degraded due to light source deviation
Solution Approach 1:
The optical member serves as a mediator that corrects optical unevenness caused by light source deviation. By positioning the first region with higher light transmittance at the optical axis and the second region with lower light transmittance away from it, the optical member compensates for the intensity distribution changes, thereby improving aesthetic appearance while maintaining easy assembly.
Solution Approach 2:
The light transmittance parameter of the optical member is varied spatially to correct optical unevenness. The first region has higher light transmittance to increase light intensity at the optical axis, while the second region has lower light transmittance to decrease light intensity away from the optical axis, thereby equalizing the overall light distribution and improving aesthetic appearance.
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 minimizes the impact of light source deviation on optical characteristics and aesthetic appearance, maintaining even illuminance and reducing optical unevenness.
Implementation Method 1
The first region has a light transmittance higher than a light transmittance of the second region
Implementation Method 2
The first region has a light diffusivity higher than a light diffusivity of the second region
Data Source
AI summary
A light emitting unit includes: a substrate; a light source disposed on the substrate and having a light emitting surface; and a lens unit including: a lens disposed above the light source, and an optical member fixed to the lens and disposed between the light source and the lens, the optical member including: a first region facing the light emitting surface, and a second region provided around the first region. A light transmittance of the first region is higher than a light transmittance of the second region. The lens unit is not fixed to the substrate.