Light Source Apparatus Optical Density Reduction Rotary Diffuser
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Solution Overview
Problem
Existing projector designs using laser light sources face challenges in reducing optical density on rotary diffuser plates, leading to increased size and potential damage due to uneven optical paths and higher temperatures.
Innovation Solution
A light source apparatus with polarization separation elements and retardation films that redirect and superimpose light beams onto a rotary diffuser plate, reducing optical density and allowing for compact design by aligning optical paths and adjusting color balance through rotatable retardation films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light beam fluxes from multiple light emitters are incident on the phosphor layer along different optical paths, then the optical density on the diffuser plate is reduced, but the size of the entire light source apparatus increases
Solution Approach 1:
The patent merges multiple light beam fluxes onto a single optical path by using a diffuser plate to diffuse the light from multiple emitters, allowing them to travel together through the optical system rather than along separate paths, thereby reducing apparatus size while maintaining reduced optical density benefits
Solution Approach 2:
The diffuser plate acts as an intermediary element that receives light from multiple emitters and redistributes it into a unified beam flux, enabling multiple light sources to be combined into a single optical path without requiring separate transmission channels for each emitter
2Illumination intensity
If multiple light beam fluxes are incident on the diffuser plate, then the optical density burden is reduced, but the temperature of the diffuser plate increases causing potential damage
Solution Approach 1:
The patent employs a rotating diffuser plate that periodically moves through the light beam fluxes, allowing different portions of the plate to be exposed to light at different times. This periodic rotation distributes the thermal load across the entire plate surface, preventing localized overheating and potential damage while maintaining the optical density reduction benefit
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 effectively reduces the burden on rotary diffuser plates, preventing damage and enabling a compact projector design with improved reliability and color balance adjustment.
Implementation Method 1
a first polarization separation element that reflects the first light beam flux polarized in a first direction and transmits the first light beam flux polarized in a second direction perpendicular to the first direction
Implementation Method 2
a second polarization separation element that reflects the second light beam flux polarized in the first direction and transmits the second light beam flux polarized in the second direction
Implementation Method 3
a first retardation film on which the second light beam flux polarized in the first direction and reflected off the second polarization separation element is incident and which converts the second light beam flux polarized in the first direction into the second light beam flux polarized in the second direction
Implementation Method 4
a wavelength conversion element on which the first light beam flux polarized in the first direction and reflected off the first polarization separation element and the second light beam flux polarized in the second direction, having exited out of the first retardation film, and having passed through the first polarization separation element are incident and which converts the first light beam flux polarized in the first direction and the second light beam flux polarized in the second direction into a third light beam flux that belongs to a wavelength band different from a wavelength band to which the first light beam flux polarized in the first direction and the second light beam flux polarized in the second direction belong
Implementation Method 5
a rotary diffuser plate which rotates around a center axis of rotation, on which the first light beam flux having passed through the first polarization separation element is incident in a first position separate from the center axis of rotation by a first length, on which the second light beam flux having passed through the second polarization separation element is incident in a second position separate from the center axis of rotation by a second length different from the first length, and which diffuses the incident first light beam flux and second light beam flux
Data Source
AI summary
A light source apparatus includes a light source section that outputs first and second light beam fluxes, first and second polarization separation elements, a rotary diffuser plate that diffuses the first light beam flux and the second light beam flux, a first retardation film that converts the incident second light beam flux polarized in a first direction into the second light beam flux polarized in a second direction, and a wavelength conversion element on which the first light beam flux polarized in the first direction and the second light beam flux polarized in the second direction, are incident and which converts the first and second light beam fluxes into a third light beam flux that belongs to a wavelength band different from the wavelength band to which the first and second light beam fluxes belong. The third light beam flux passes through the first and second polarization separation elements.