Stage Lighting Fixture Elliptical Reflector Chromatic Aberration
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Solution Overview
Problem
Stage lighting fixtures fail to produce a strong, perfect light beam due to chromatic defects in the form of a halo of a different color from the beam.
Innovation Solution
A stage lighting fixture design incorporating a short-arc lamp, an elliptical reflector, and a specific optical assembly with adjustable lenses to concentrate and focus the light beam, eliminating chromatic defects and achieving high-intensity, homogeneous illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lighting fixtures use standard light sources and optical assemblies, then the device complexity is reduced and ease of manufacture is improved, but chromatic defects in the form of a halo of a different color from the beam occur
Solution Approach 1:
The optical assembly is divided into multiple lens elements (first lens, second lens, third lens) with different optical properties. Each lens segment performs a specific function: the first lens begins focusing, the second lens corrects chromatic aberrations, and the third lens further refines the beam. This segmentation allows elimination of chromatic defects while maintaining manufacturability through modular design.
Solution Approach 2:
The patent changes the optical parameters of multiple lens elements in the assembly, including focal lengths, refractive indices, and curvatures. By carefully selecting and adjusting these parameters for each lens, the system corrects chromatic aberrations and produces a homogeneous beam without the halo effect, while keeping each individual lens manufacturable with standard tolerances.
2Illumination intensity
If conventional lighting fixtures use standard optical assemblies, then the device complexity is reduced, but the beam quality and intensity are insufficient
Solution Approach 1:
The patent merges multiple lens elements into a single integrated optical assembly that works together as a unified system. The first, second, and third lenses are positioned and configured to collectively focus the light beam to a small spot, achieving high intensity. While the assembly is more complex than a single lens, the merged design optimizes the overall beam quality and intensity beyond what any single element could achieve.
Solution Approach 2:
The patent employs curved lens surfaces with specific radii of curvature to focus the light beam effectively. The spherical or aspherical surfaces of the lens elements are designed to converge light rays to a small focal spot, increasing beam intensity. The curvature parameters are optimized to balance focusing capability with manufacturing feasibility.
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 generates a very strong, high-quality, and compact light beam with no aberrations, achieving brightness comparable to nine times more powerful lamps with significantly lower energy consumption and a longer lifespan, resembling a laser-like beam.
Implementation Method 1
a light source housed inside the casing, close to the closed first end, and which emits a light beam along an optical axis
Implementation Method 2
an optical assembly positioned to intercept the light beam... optical assembly with adjustable lenses to concentrate and focus the light beam
Implementation Method 3
specific optical assembly with adjustable lenses to concentrate and focus the light beam
Implementation Method 4
an elliptical reflector, and a specific optical assembly with adjustable lenses to concentrate and focus the light beam
Data Source
AI summary
A stage lighting fixture having:a casing having a closed first end and an open second end;a light source housed inside the casing, close to the first end, and which emits a light beam along an optical axis;an optical assembly positioned to intercept the light beam, and having a focal point located between the light source and the optical assembly; anda reflector coupled to the light source;the reflector and the light source being designed and coupled to concentrate the light beam substantially at a work point substantially coincident with the focal point of the optical assembly; andthe light source being defined by a short-arc lamp to project a light bar.