Light Source Optical System for Projector Energy Density Uniformity
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Solution Overview
Problem
Current projector technologies face challenges in achieving high light utilization efficiency due to varying energy density of excitation light on fluorescent bodies, leading to decreased efficiency and increased temperature, as well as the complexity and cost associated with existing optical systems that attempt to address these issues.
Innovation Solution
A light source optical system comprising a wavelength conversion unit and two optical systems with specific power characteristics, where the first optical system converges light to focus it closer to the optical axis and the second optical system has under-corrected spherical aberration, optimizing the spot size and energy distribution on the fluorescent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spot size of the excitation light on the fluorescent body is increased to hold the energy density, then the light utilization efficiency of the fluorescent body is improved, but the amount of vignetting of rays increases in the downstream optical system, decreasing the light utilization efficiency of the entire projector
Solution Approach 1:
The patent divides the optical system into two separate optical systems with different functions: the first optical system focuses on uniformizing energy density across the fluorescent body surface, while the second optical system handles the collection and transmission of emitted light. This segmentation allows each system to be optimized for its specific function without compromising the other, resolving the contradiction between maintaining energy density and minimizing vignetting losses.
2Stability of the object's composition
If a diffusion plate is provided between the excitation light source and the fluorescent-body unit to uniformize intensity distribution, then the energy density uniformity is improved, but the intensity of excitation light incident on the fluorescent body decreases, reducing the light utilization efficiency
Solution Approach 1:
The patent replaces the mechanical diffusion plate with an optical system that achieves uniformization through controlled refraction and reflection. The first optical system uses precisely designed lens surfaces to redirect light rays and uniformize energy density distribution without the light-absorbing losses inherent in diffusion plates, thereby maintaining high light utilization efficiency while achieving uniform energy distribution.
3Stability of the object's composition
If mirror arrays and lens arrays are used to uniformize intensity distribution, then the energy density uniformity is improved, but the size, complexity, and cost of the apparatus increase
Solution Approach 1:
The patent merges the functions of uniformization and light collection into a integrated first optical system. By combining multiple optical elements with specific powers and arrangements, the system achieves energy density uniformization while simultaneously preparing the light for efficient collection by the second optical system, thereby reducing the need for separate mirror arrays and lens arrays.
4Stability of the object's composition
If mirror arrays and lens arrays are used to uniformize intensity distribution, then the energy density uniformity is improved, but absorption by these components decreases the efficiency of excitation light incident on the fluorescent body
Solution Approach 1:
The patent substitutes traditional mirror arrays and lens arrays with a redesigned first optical system that minimizes absorption losses. The optical system uses carefully designed refraction and reflection surfaces that achieve uniformization with minimal light loss, replacing the absorptive nature of conventional mirror and lens arrays with a more efficient optical path management approach.
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 enhances light utilization efficiency while downsizing the projector, reducing the need for additional components like diffusion plates and mirror arrays, thereby improving performance and reducing costs.
Implementation Method 1
a first optical system (23) having a positive power and a second optical system (26) having a positive power provided in this order in an optical path between the excitation light source and the wavelength conversion unit
Implementation Method 2
The second optical system has under-corrected spherical aberration at a paraxial focal position of the second optical system
Implementation Method 3
a wavelength conversion unit configured to receive the first color light emitted by the excitation light source and emit second color light with a wavelength different from a wavelength of the first color light
Data Source
AI summary
A light source optical system used with an excitation light source configured to emit first color light includes a wavelength conversion unit configured to receive the first color light emitted by the excitation light source and emit second color light with a wavelength different from a wavelength of the first color light, There is a first optical system having a positive power and a second optical system having a positive power provided in this order in an optical path between the excitation light source and the wavelength conversion unit. When a ray parallel to an optical axis of the first optical system is incident on the first optical system, a ray emitted from the first optical system is incident on the second optical system while approaching the optical axis. The second optical system has under-corrected spherical aberration at a paraxial focal position of the second optical system.