Light Source Unit Optical Member Deflects Pump Beam
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Solution Overview
Problem
Conventional light source units face difficulties in achieving a tilt angle of the pump beam relative to the phosphor less than 30 degrees, which restricts reflector design and collection efficiency, making it challenging to obtain a desirable spot shape and maximize overall efficiency.
Innovation Solution
A light source unit configuration that includes an optical member to deflect the pump beam, increasing its angle of incidence relative to the phosphor, with the optical member bonded to the phosphor and having a counterface surface to cover the phosphor, allowing for angles of incidence up to 40 degrees, and refracting or diffracting the beam to improve alignment and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tilt angle of the pump beam relative to the phosphor is reduced to increase reflector design freedom and collection efficiency, then the spot shape becomes distorted and difficult to control
Solution Approach 1:
A tilt correction optical member is introduced as an intermediary component between the pump beam source and the phosphor. This optical member corrects the tilt angle of the pump beam before it reaches the phosphor, allowing the system to achieve both small tilt angles for improved reflector design freedom and proper spot shape control on the phosphor surface.
2Loss of energy
If the tilt angle of the pump beam relative to the phosphor is reduced to maximize collection efficiency, then the spot shape becomes distorted and desirable spot shape becomes difficult to obtain
Solution Approach 1:
The tilt correction optical member serves as a mediator that enables the system to achieve small tilt angles (improving collection efficiency) while simultaneously maintaining proper spot shape. The optical member corrects the beam tilt before phosphor excitation, decoupling the relationship between tilt angle and spot shape distortion.
3Loss of energy
If the tilt angle of the pump beam relative to the phosphor is reduced below 30 degrees to improve overall efficiency, then the spot shape becomes distorted and difficult to control
Solution Approach 1:
The tilt correction optical member is positioned to correct the tilt angle of the pump beam before it reaches the phosphor. This intermediary component enables the system to operate at tilt angles below 30 degrees (improving overall efficiency) while maintaining proper spot shape control through active tilt correction.
Solution Approach 2:
The system changes the tilt angle parameter of the pump beam using the optical correction member, allowing operation at smaller tilt angles that improve overall efficiency while the optical member compensates for shape distortion effects.
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 enhances the collection efficiency of the reflector and optimizes the light source unit design by allowing for a smaller tilt angle, improving the projection of the converted beam and increasing the overall efficiency of the light source unit.
Implementation Method 1
the optical member refracts or diffracts the pump beam to deflect the pump beam toward a side of the phosphor in a traveling direction
Implementation Method 2
the optical member refracts or diffracts the pump beam to deflect the pump beam toward a side of the phosphor in a traveling direction
Implementation Method 3
a phosphor that converts the pump beam, which is emitted from the light source, into a converted beam
Data Source
AI summary
[Object] Collection efficiency of a reflector that reflects a converted beam, which is converted from a pump beam by a phosphor, and projects the resultant as a projection beam is increased.[Solution] An optical member (4) of a light source unit (1) deflects a pump beam (PB) so that a first angle of incidence (α1) of a pump beam (PBX) relative to a surface of a phosphor (3) is larger than a second angle of incidence (α2) of the pump beam (PB), which is incident on the optical member (4), relative to the surface of the phosphor (3).