Adjustable Positive Power Lens for Projector Light Source Aberration Control
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Solution Overview
Problem
High-luminance projectors face challenges due to variations in optical component performance and assembly, leading to inappropriate excitation light irradiation size, which results in decreased wavelength conversion efficiency and inefficient capture of fluorescent light by illumination and projection optical systems, along with aberrations causing intensity distribution unevenness and saturation.
Innovation Solution
A light source device with a phosphor unit, an excitation light source, a reducing optical system comprising lenses with varying positive powers, and a condensing optical system that adjusts the excitation light's luminous flux diameter, using a lens-moving section to maintain appropriate irradiation size and reduce aberrations, ensuring uniform intensity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the irradiation size of excitation light is reduced to increase light density and peak intensity, then the wavelength conversion efficiency improves, but the irradiation size becomes too small to be efficiently captured by illumination and projection optical systems
Solution Approach 1:
The patent applies dynamics by making the positive power lens movable along the optical axis through a lens-moving section. This allows the irradiation size of excitation light to be dynamically adjusted to an appropriate size, resolving the contradiction between achieving high light density (for wavelength conversion efficiency) and maintaining sufficient irradiation area (for efficient capture by optical systems). The movable lens enables real-time optimization of the balance between these two competing requirements.
2Area of stationary object
If high positive power lenses are used to reduce luminous flux diameter, then the condensing effect improves, but aberrations occur causing intensity distribution unevenness
Solution Approach 1:
The patent uses a movable positive power lens that can be adjusted along the optical axis. By dynamically positioning the lens at different locations, the system achieves both effective luminous flux diameter reduction and minimization of aberrations. The adjustability allows optimization of the lens position to balance condensing effect and intensity distribution uniformity, resolving the contradiction between these two parameters.
3Ease of manufacture
If variations in optical component performance and assembly occur, then manufacturing flexibility is maintained, but the irradiation size becomes inappropriate leading to decreased efficiency
Solution Approach 1:
The patent incorporates a lens-moving section that enables dynamic adjustment of the positive power lens position. This dynamic mechanism compensates for variations in optical component performance and assembly tolerances by allowing real-time optimization of the irradiation size. The adjustability ensures that appropriate irradiation size is achieved despite manufacturing variations, resolving the contradiction between assembly flexibility and light output efficiency.
4Productivity
If the positive power lens is made adjustable, then the irradiation size can be optimized, but the device complexity increases
Solution Approach 1:
The patent implements a lens-moving section with a movable positive power lens that can be adjusted along the optical axis. This dynamic structure provides optimization capability for irradiation size while maintaining relatively simple construction. The adjustability resolves the contradiction by enabling efficiency optimization through a straightforward mechanical adjustment mechanism rather than requiring complex optical systems.
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 solution stabilizes light output, maintains high light output levels, and ensures efficient capture of fluorescent light by adjusting the irradiation size and reducing aberrations, thereby enhancing wavelength conversion efficiency and light utilization in projectors.
Implementation Method 1
a phosphor layer, which produces red fluorescent light and green fluorescent light when blue light is irradiated thereon
Data Source
AI summary
A light source device includes: a phosphor unit that is provided with a phosphor; an excitation light source that supplies excitation light that excites the phosphor; a reducing optical system that reduces the luminous flux diameter of the excitation light; and a light condensing optical system that condenses, on the phosphor unit, excitation light for which the luminous flux diameter was reduced by the reducing optical system. The reducing optical system includes: a plurality of lenses including two lenses having positive power; and a lens-moving section that moves the lens back and forth along the direction of the optical axis. The lens is disposed on the excitation light source side, and has a lower power than the lens. The refractive index of the lens is equal to or smaller than the refractive indexes of the other lenses of the reducing optical system.