Two-Lens Laser Optics for Uniform Chromaticity
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Solution Overview
Problem
Conventional light-emitting devices using semiconductor laser diodes suffer from angle-dependent chromaticity issues due to the narrow spread angle of laser beams, leading to uneven light distribution and chromaticity variations when integrated with wavelength-converted light.
Innovation Solution
A light-emitting device design incorporating a first lens with a smaller spread angle and a second lens with a larger spread angle, where the second lens refracts the laser beam to increase its spread before it reaches the wavelength converting part, ensuring a wider angle distribution and reducing chromaticity dependence on the light extraction direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single diffusion lens is used to diffuse the laser beam, then the light distribution is improved, but the chromaticity angle dependence cannot be sufficiently suppressed
Solution Approach 1:
The single diffusion lens is divided into two separate lenses: a first diffusion lens with a first focal length and a second diffusion lens with a second focal length. This segmentation allows each lens to perform a specific function in the light diffusion process, with the first lens providing initial diffusion and the second lens providing additional diffusion to achieve uniform chromaticity across different viewing angles.
Solution Approach 2:
The patent introduces a new dimension to the light diffusion process by adding a second diffusion lens with a different focal length. This creates a two-stage diffusion system that controls the light distribution in multiple dimensions, enabling both wide viewing angle and uniform chromaticity that cannot be achieved with a single lens.
2Length of moving object
If the laser beam is diffused by a single lens, then the spread angle is increased, but the chromaticity varies with viewing angle
Solution Approach 1:
The diffusion function is segmented into two stages performed by two separate lenses with different focal lengths. The first lens provides initial beam diffusion while the second lens provides additional diffusion, collectively achieving a large spread angle while maintaining chromaticity consistency through the coordinated action of both lenses.
Solution Approach 2:
The patent changes the parameter of focal length between the two lenses, with the first lens having a first focal length and the second lens having a second focal length. This parameter variation allows optimization of the light diffusion process at different stages, achieving both wide spread angle and uniform chromaticity.
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 design achieves uniform chromaticity and wide-angle light distribution by further diffusing the laser beam, thereby suppressing angle-dependent chromaticity variations and enhancing the overall light emission characteristics.
Implementation Method 1
The first lens has a first spread angle θ1 and refracts the laser beam emitted from the semiconductor laser diode
Implementation Method 2
The second lens has a second spread angle θ2 and refracts a laser beam refracted by the first lens
Implementation Method 3
a wavelength converting part for converting the wavelength of the laser beam emitted from the semiconductor laser diode
Data Source
AI summary
Provided is a light-emitting device having low angle dependence of chromaticity as well as achieving wide-angle light distribution. The light-emitting device has a semiconductor laser diode, a first lens, a second lens, and a wavelength converting part for converting the wavelength of the laser beam emitted from the semiconductor laser diode. The first lens has a first spread angle and refracts the laser beam emitted from the semiconductor laser diode. The second lens has a second spread angle and refracts the laser beam refracted by the first lens. The second spread angle is larger than the first spread angle.