Compact Light Source Device Using Folded Optical Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projection display apparatuses require larger light source devices due to the need for the light source and phosphor wheel to be disposed surrounding the optical axis, limiting the miniaturization of the system.
Innovation Solution
A light source device that includes a light source element emitting light in a first wavelength region, a selective reflection element separating the light into first and second lights, a first light direction conversion element reflecting these lights, and a wavelength conversion element converting the first light into a third light, allowing the second and third lights to be emitted in a different direction, thus enabling downsizing by not requiring the light source and wavelength conversion element to face each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light source and phosphor wheel are disposed surrounding the optical axis, then the light separation and conversion efficiency is maintained, but the device size increases
Solution Approach 1:
The patent transitions from a two-dimensional arrangement where the light source and phosphor wheel are disposed on opposite sides of the optical axis to a configuration where both elements are positioned on one side of the optical axis. This dimensional reorganization allows the light to undergo multiple reflections and conversions within a compact space, maintaining conversion efficiency while reducing the overall device footprint.
Solution Approach 2:
The patent implements a nested arrangement where the light source, phosphor wheel, and optical elements are positioned in a compact configuration on one side of the optical axis. The light path is folded back through multiple reflections, creating a nested-like structure where components are arranged in a space-efficient manner, allowing the light to traverse the necessary optical path length within a reduced device volume.
2Volume of moving object
If the light source and wavelength conversion element are positioned on one side, then the device can be downsized, but the light path becomes more complex
Solution Approach 1:
The patent divides the light path into multiple segments using separate reflection elements. Each reflection element handles a specific portion of the light path, reflecting light between the light source, phosphor wheel, and optical axis. This segmentation allows the complex light path to be managed through discrete, modular optical components, making the system easier to design and assemble despite the folded geometry.
Solution Approach 2:
The patent introduces reflection elements as intermediary components that mediate the light path between the light source, phosphor wheel, and optical axis. These intermediaries facilitate the folded light path by reflecting light at specific angles, enabling the compact arrangement while maintaining optical efficiency. The reflection elements act as mediators that simplify the overall optical design by providing clear, defined light paths through systematic reflection.
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 a compact light source device and projection display apparatus, as the light source and wavelength conversion elements can be positioned on one side, facilitating a more compact design without compromising light separation and conversion efficiency.
Implementation Method 1
a selective reflection element that reflects a part of the light source light and transmits a rest of the light source light to separate the light source light into first light and second light
Implementation Method 2
a first light direction conversion element that is disposed at a position for receiving the first light guided in a first direction from the selective reflection element to reflect the first light in a second direction
Implementation Method 3
a wavelength conversion element that is disposed at a position for receiving the first light reflected in the second direction by the first light direction conversion element to convert the first light into third light in a second wavelength region
Implementation Method 4
The first light direction conversion element reflects the third light received from the wavelength conversion element in a third direction opposite to the first direction
Data Source
AI summary
A light source device includes a light source element that emits light source light in a first wavelength region, a selective reflection element that separates the light source light into first light and second light, a first light direction conversion element that reflects the first light guided in a first direction from the selective reflection element in a second direction, and a wavelength conversion element that converts the first light into third light in a second wavelength region. The first light direction conversion element reflects the third light in a third direction opposite to the first direction. The selective reflection element transmits the third light reflected by the first light direction conversion element. The selective reflection element guides the second light and the third light in the third direction. The light source element emits the light source light in a direction different from the second direction.