Sealed Light Source Device for Projectors
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Solution Overview
Problem
Dust intrusion into projector light source devices causes component deterioration and heat generation due to adherence on lenses and fluorescent screen wheels, leading to operational inefficiencies.
Innovation Solution
A light source device with a sealed configuration, including a light source unit, wavelength conversion unit, and optical unit, where the wavelength conversion wheel is exposed via openings in the wheel and optical housings, positioned between the condensing and pickup optical systems, preventing dust ingress and maintaining a sealed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the light source device uses a conventional open structure with cooling devices, then heat dissipation is improved, but dust intrusion causes component deterioration and heat generation
Solution Approach 1:
The light source device is divided into separate sealed modules: a light source module containing the semiconductor laser, a wavelength conversion module containing the fluorescent screen wheel, and an optical module. Each module is independently sealed to prevent dust intrusion while maintaining proper heat dissipation pathways through designated openings.
Solution Approach 2:
The interior of each sealed module is filled with dust-free air or inert gas to create a protected environment that prevents dust particles from adhering to optical components and fluorescent screens, thereby eliminating the harmful effects of dust accumulation while maintaining operational reliability.
2Reliability
If the wavelength conversion wheel is fully enclosed in the wheel housing, then dust protection is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The wheel housing is designed with a localized opening section that exposes only the necessary portion of the wavelength conversion wheel to the optical path. This selective exposure maintains dust protection for the majority of the wheel structure while allowing efficient light extraction through the designated opening, optimizing both protection and performance.
3Reliability
If the light source device is fully sealed, then dust intrusion is prevented, but heat dissipation capability is reduced
Solution Approach 1:
The sealed light source device is segmented into multiple modules with controlled openings. Each module is sealed to prevent dust intrusion, while designated opening sections allow heat dissipation. The segmentation enables simultaneous achievement of dust protection and thermal management through distributed opening locations.
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
Prevents dust-induced component deterioration and heat generation, ensuring reliable operation by maintaining a dust-free environment within the light source device, enhancing the projector's performance and reliability.
Implementation Method 1
a condensing optical system including a first lens for condensing the excitation light on the wavelength conversion wheel
Implementation Method 2
a wavelength conversion unit including: a wavelength conversion wheel configured to make excitation light emitted from the light emitting element incident from a first surface and emit wavelength-converted light obtained by wavelength-converting the excitation light from a second surface opposite to the first surface
Data Source
AI summary
A light source device according to an aspect of the present disclosure includes a light source unit, a wavelength conversion unit including a wavelength conversion wheel, and a wheel housing configured to expose a part of the wavelength conversion wheel and house the wavelength conversion wheel, and an optical unit including a condensing optical system, a pickup optical system, and an optical housing. The light source unit and the optical unit are fixed in a sealed state. In the optical unit and the wavelength conversion unit, a part of the wavelength conversion wheel exposed via a first opening section of the wheel housing is disposed on an optical path between the condensing optical system and the pickup optical system. The second opening section of the optical housing and the first opening section of the wheel housing are fixed in a sealed state.