Conical Mirror Light Source for Projector Efficiency
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Solution Overview
Problem
Miniaturized light source devices in projectors face challenges in achieving high luminance due to inefficiencies in light utilization, with a significant portion of emitted light being diffused and not effectively used in the projection process.
Innovation Solution
A light source device incorporating a reflector with a spherical light emitting portion and a cone-shaped conical mirror, where the light emitting portion is positioned at the focal point of the reflector, and a light guiding device to ensure uniform intensity of the emitted rays, reducing diffused light and increasing utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a miniaturized light source device is used, then the projector size is reduced, but the light utilization efficiency deteriorates causing diffused light and reduced luminance
Solution Approach 1:
The light source device is segmented into distinct functional components: a reflector with specific curvature, a conical mirror with defined apex angle, and a light guiding device. Each component performs a specific function in controlling light paths, allowing the miniaturized device to efficiently manage light and reduce diffusion while maintaining compact dimensions.
Solution Approach 2:
The patent introduces a conical mirror element that adds a new dimensional aspect to light control. The conical structure with its apex angle creates a three-dimensional light redirecting mechanism that converts divergent light into a more directed beam, improving light utilization in the compact device without increasing overall size.
2Loss of energy
If the light emitting portion is positioned at the focal point of the reflector, then light is directed more efficiently, but the device structure becomes more complex
Solution Approach 1:
The reflector and conical mirror are merged into a integrated light control assembly where the light emitting portion is positioned at the focal point of the reflector. This combination creates a unified optical system that efficiently directs light through multiple reflections without requiring separate adjustment mechanisms, thus improving light utilization while managing structural complexity.
Solution Approach 2:
The conical mirror acts as an intermediary element between the reflector and the light guiding device. It receives divergent light from the focal point position and redirects it toward the light guiding device, serving as a mediating component that simplifies the overall optical path while maintaining efficient light direction.
3Loss of energy
If a conical mirror is added to redirect light, then light utilization efficiency is improved, but the device complexity increases
Solution Approach 1:
The conical mirror is designed to perform multiple functions within a single component: it redirects divergent light, defines the light beam angle through its apex angle, and interfaces between the reflector and light guiding device. This multi-functionality improves light utilization efficiency while minimizing the increase in device complexity by eliminating the need for separate components for each function.
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 enhances light utilization efficiency by directing more light towards the light guiding device, resulting in a projected image with higher luminance and reduced stray light, effectively addressing the inefficiencies in miniaturized light source devices.
Implementation Method 1
a reflector whose inner surface is made to constitute a reflection surface... a cone-shaped conical mirror whose outer surface is made to constitute a reflection surface
Data Source
AI summary
There is provided a light source device which emits a bundle of rays with less diffused light and which is suitable for a projector, the light source device including a reflector whose inner surface is made to constitute a reflection surface, a lamp made up of a spherical light emitting portion and a sealing portion which is formed in such a manner as to pass through a center of the light emitting portion to project from the light emitting portion, and a conical mirror whose outer surface is made to constitute a reflection surface, which is formed into a cone shape and which covers a front sealing portion of the sealing portion of the lamp, wherein the light emitting portion of the lamp is disposed in a position where a focal point of the reflector resides.