Projector Light Guide and Reflector for Reduced Fluorescence Loss
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Solution Overview
Problem
Existing light source devices for projectors suffer from high fluorescence loss due to inefficient reflection of excitation light, leading to reduced output light intensity.
Innovation Solution
A light source device with a light emitting element, a light guide member, a reflecting member, and a pressing member to enhance light reflection and guidance, utilizing a wavelength conversion member with specific faces and a reflecting mirror configuration to improve light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mirror is disposed at a position distant from the phosphor rod, then the structure is simpler and easier to manufacture, but the proportion of fluorescence reflected toward a direction deviated from the phosphor rod increases, causing higher fluorescence loss
Solution Approach 1:
The patent introduces a light guide member as an intermediary component between the light source and the reflecting member. This light guide member has specific optical properties that enable it to transport excitation light to the phosphor rod and to return reflected fluorescence efficiently, thereby reducing fluorescence loss while maintaining a simple overall structure.
Solution Approach 2:
The patent changes the optical parameters of the light guide member, specifically its refractive index and optical path design, to optimize light transport efficiency. By carefully controlling these parameters, the system achieves high fluorescence return efficiency without requiring complex mirror positioning or additional optical components.
2Reliability
If the mirror is disposed at a position distant from the phosphor rod, then the alignment and positioning requirements are reduced, but the light intensity and efficiency of the device decrease due to increased fluorescence loss
Solution Approach 1:
The light guide member serves as a stable intermediary that defines the optical path between the light source and phosphor rod. This intermediary structure provides inherent alignment stability through its physical geometry and optical properties, eliminating the need for precise mirror positioning while maintaining high light intensity through efficient light transport.
Solution Approach 2:
The patent replaces the mechanical alignment system (precise mirror positioning) with an optical system based on the light guide member's inherent light transport properties. This substitution maintains alignment stability through optical design rather than mechanical precision, while simultaneously improving light intensity through optimized optical paths.
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 significantly reduces fluorescence loss, enhancing the intensity and efficiency of light emission by improving the reflection and guidance of light within the device.
Implementation Method 1
a light guide member configured to guide the light emitted from the light emitting element
Implementation Method 2
a reflecting member having a reflecting surface configured to reflect the light proceeding through the light guide member
Implementation Method 3
a pressing member configured to press the reflecting member from a surface at an opposite side to the reflecting surface of the reflecting member toward the second face
Data Source
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AI summary
A light source device according to the present disclosure includes a light emitting element configured to emit light, a light guide member configured to guide the light emitted from the light emitting element, a reflecting member having a reflecting surface configured to reflect the light proceeding through the light guide member, and a pressing member configured to press the reflecting member against the light guide member. The light guide member includes a first face and a second face located at respective sides opposite to each other in a first direction as a longitudinal direction of the light guide member, and a third face and a fourth face located at respective sides opposite to each other in a second direction in an imaginary plane perpendicular to the first direction. The light guided through the light guide member is emitted from the first face. The light emitting element is disposed so as to be opposed to the third face. The second face and the reflecting surface have contact with each other, and the pressing member is configured to press the reflecting member from a surface at an opposite side to the reflecting surface of the reflecting member toward the second face.