Dichroic Mirror Trapezoidal Coat for Laser Light Source
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Solution Overview
Problem
The existing light source devices for projectors, with multiple excitation light reflection parts on dichroic mirrors, experience a reduction in reflection efficiency due to the inability to form dichroic coats at boundaries, caused by shading during vapor deposition.
Innovation Solution
A light source device featuring a dichroic mirror with a flat incident surface and a trapezoidal dichroic coat region that reflects blue laser light, allowing part of the excited light to penetrate, reducing the number of boundaries and enhancing reflection efficiency by uniformly distributing the blue laser light to the fluorescent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple excitation light reflection parts are provided on the dichroic mirror, then the blue excitation light can be effectively directed to the fluorescent plate, but the number of boundaries between excitation light reflection parts and light penetration parts increases, causing a reduction in reflection efficiency at the boundaries
Solution Approach 1:
The patent merges multiple separate excitation light reflection parts into a single continuous dichroic coat region on the dichroic mirror. This eliminates the boundaries between multiple reflection parts and light penetration parts, thereby preventing the reduction in reflection efficiency that would occur at these boundaries due to mask shading during vapor deposition.
Solution Approach 2:
The patent segments the dichroic coat region into a specific geometric shape (trapezoidal or rectangular with inclined sides) that is optimized for the laser beam profile. This segmentation allows the dichroic coat to cover the entire width of the laser beam in the vertical direction while maintaining appropriate reflection properties, eliminating the need for multiple separate reflection parts.
2Manufacturing precision
If a dichroic coat is formed by vapor deposition using a mask, then the excitation light reflection parts can be precisely formed, but the mask causes shading at the boundaries, preventing proper formation of the dichroic coat
Solution Approach 1:
The patent employs an asymmetric dichroic coat region shape (trapezoidal or rectangular with inclined sides) where the width of the coat varies across its area. This asymmetric design ensures that the dichroic coat is formed only in regions where it is needed for laser beam reflection, while leaving the boundary regions open for light penetration. The asymmetric shape eliminates the mask shading problem at boundaries by designing the coat geometry to naturally avoid these critical boundary zones.
3Ease of manufacture
If the dichroic coat region has a uniform shape, then the manufacturing process is simplified, but the reflection efficiency is reduced due to increased boundaries with light penetration parts
Solution Approach 1:
The patent uses an asymmetric dichroic coat region shape (trapezoidal or rectangular with inclined sides) that is optimized for the laser beam profile. This asymmetric design reduces the perimeter of the dichroic coat region, thereby minimizing the number of boundaries with light penetration parts. The result is improved reflection efficiency while maintaining ease of manufacture through a single continuous coat formation process.
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 trapezoidal dichroic coat region on the dichroic mirror improves reflection efficiency and stable excitation of the fluorescent body, ensuring efficient penetration of yellow and blue light for illumination, thereby enhancing the overall performance of the light source device.
Implementation Method 1
configured to reflect the incident blue laser light in a second direction different from a first direction which is an emission direction of the blue laser light
Implementation Method 2
light excited by the fluorescent body and emitted in a direction opposite to the second direction
Implementation Method 3
allow part of light excited by the fluorescent body and emitted in a direction opposite to the second direction to penetrate through the dichroic mirror
Implementation Method 4
The incident surface of the dichroic mirror is provided with a dichroic coat region coated with a dichroic coat so as to reflect the blue laser light
Data Source
AI summary
A light source device includes a blue laser light module that emits a blue laser light, and a dichroic mirror including an incident surface, and that reflects the incident blue laser light in a second direction different from a first direction which is an emission direction of the blue laser light so as to introduce the blue laser light into a fluorescent body, and allow part of light excited by the fluorescent body and emitted in a direction opposite to the second direction to penetrate through the dichroic mirror. The incident surface is provided with a dichroic coat region coated with a dichroic coat so as to reflect the blue laser light, and the dichroic coat region is formed on the incident surface such that a length in a direction orthogonal to the first direction is longer as a distance from the blue laser module is farther.