Illumination Device Chromatic Aberration Correction
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Solution Overview
Problem
Existing illumination devices face challenges in achieving both high parallelism and uniformity of fluorescence due to chromatic aberration, as the condensing lens must balance between condensing and collimating functions, often compromising on either parallelism or uniformity.
Innovation Solution
The illumination device incorporates a chromatic aberration-correcting optical element, which can have negative or positive power, strategically placed between the integrator optical system and wavelength separation element or downstream of the wavelength separation element, to improve the parallelism and uniformity of the fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the condensing lens is designed so as to uniform the illuminance distribution of the excitation light on the phosphor layer, then the uniformity of illuminance distribution is improved, but the parallelism of the fluorescence is reduced due to chromatic aberration
Solution Approach 1:
The optical system is divided into separate functional components: a condensing lens for uniform illuminance distribution and a collimating lens for fluorescence parallelism. This segmentation allows each component to be optimized for its specific function without the trade-offs inherent in a single multi-functional lens, thereby resolving the contradiction between uniformity and parallelism.
Solution Approach 2:
A chromatic aberration correcting plate is introduced as an intermediary element between the condensing lens and the collimating lens. This plate corrects the chromatic aberration produced by the condensing lens, enabling the system to maintain both uniform illuminance distribution and high fluorescence parallelism by compensating for the wavelength-dependent focal shifts.
2Measurement precision
If the condensing lens is designed so as to increase the parallelism of the fluorescence, then the parallelism is improved, but the uniformity of the illuminance distribution of the excitation light on the phosphor layer is reduced due to the influence of chromatic aberration
Solution Approach 1:
The optical system is divided into separate functional components: a condensing lens for uniform illuminance distribution and a collimating lens for fluorescence parallelism. This segmentation allows each component to be optimized for its specific function without the trade-offs inherent in a single multi-functional lens, thereby resolving the contradiction between uniformity and parallelism.
Solution Approach 2:
A chromatic aberration correcting plate is introduced as an intermediary element between the condensing lens and the collimating lens. This plate corrects the chromatic aberration produced by the condensing lens, enabling the system to maintain both uniform illuminance distribution and high fluorescence parallelism by compensating for the wavelength-dependent focal shifts.
3Device complexity
If a single optical system acts as both condensing and collimating optical systems, then the device complexity is reduced, but it is difficult to achieve both the use efficiency of the fluorescence and the uniformity of the intensity distribution of the fluorescence
Solution Approach 1:
The optical system is divided into separate functional components: a condensing lens for uniform illuminance distribution and a collimating lens for fluorescence parallelism. This segmentation allows each component to be optimized for its specific function without the trade-offs inherent in a single multi-functional lens, thereby resolving the contradiction between uniformity and parallelism.
Solution Approach 2:
A chromatic aberration correcting plate is introduced as an intermediary element between the condensing lens and the collimating lens. This plate corrects the chromatic aberration produced by the condensing lens, enabling the system to maintain both uniform illuminance distribution and high fluorescence parallelism by compensating for the wavelength-dependent focal shifts.
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 simultaneous high parallelism and uniformity of the fluorescence, enabling efficient utilization of the fluorescence with a highly uniform intensity distribution, while maintaining a cost-effective and compact device design.
Implementation Method 1
a wavelength conversion element that converts the first light transmitting through the integrator optical system into second light at a second wavelength different from the first wavelength
Implementation Method 2
a chromatic aberration-correcting optical element that is provided at least one of between the integrator optical system and the wavelength separation element on the optical path of the first light and at downstream of the wavelength separation element on an optical path of the second light
Data Source
AI summary
An illumination device includes: a light source that emits first light at a first wavelength; an integrator optical system that the first light enters; a wavelength conversion element that converts the first light transmitting through the integrator optical system into second light at a second wavelength different from the first wavelength; a wavelength separation element provided on an optical path of the first light between the integrator optical system and the wavelength conversion element; a pickup optical system that is provided between the wavelength conversion element and the wavelength separation element and receives the first light and the second light; and a chromatic aberration-correcting optical element provided at least one of between the integrator optical system and the wavelength separation element on the optical path of the first light and at downstream of the wavelength separation element on an optical path of the second light.