Laser Diode Light Source with Wavelength Conversion Plate
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Solution Overview
Problem
Conventional high-power light sources, such as LEDs and HID lamps, face limitations in efficiency and lifespan, making them unsuitable for high-intensity, small-area illumination, and new alternatives are needed for laser light source devices.
Innovation Solution
A high-power, small-sized laser light source device utilizing blue or ultraviolet laser diodes, a wavelength conversion plate with an optoceramic phosphor, and an anisotropic coating layer to achieve straight light emission, combined with a reflection and projection unit for efficient light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LEDs are used as high power light sources, then they provide broad illumination coverage, but they have large light exit angles and reduced efficiency at high current
Solution Approach 1:
The patent changes the light source from conventional LEDs to blue/ultraviolet laser diodes, fundamentally altering the light emission parameters. This enables narrow light exit angles and maintained efficiency at high currents, while the wavelength conversion plate converts the laser light to desired colors for broad illumination coverage.
2Illumination intensity
If HID lamps or metal halide lamps are used as high power light sources, then they provide high illumination intensity, but they have short lifespan and low efficiency
Solution Approach 1:
The patent replaces the thermal arc discharge mechanism of HID lamps with a solid-state laser diode system. This substitution eliminates the short lifespan issues associated with arc discharge lamps while maintaining high illumination intensity through efficient electrical-to-optical conversion in the laser diodes.
3Illumination intensity
If conventional laser light sources are used, then they provide high illumination intensity, but they have short lifespan and low efficiency
Solution Approach 1:
The patent uses blue and ultraviolet laser diodes which have superior efficiency characteristics compared to conventional laser sources. The direct electrical-to-optical conversion in laser diodes achieves high efficiency while the wavelength conversion plate enables flexible color output, and the collimating lens ensures straight light emission for high intensity illumination.
4Loss of energy
If blue or ultraviolet laser diodes are used, then they provide narrow light exit angle and high efficiency at high current, but they require wavelength conversion to achieve desired light colors
Solution Approach 1:
The patent introduces a wavelength conversion plate as an intermediary component between the blue/ultraviolet laser diodes and the final light output. This plate converts the laser wavelength to desired visible colors while the collimating lens simultaneously provides straight light emission, managing the complexity through integrated optical design.
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 device provides a high-power, small-sized laser light source with a narrow light exit angle, maintaining efficiency at high currents and offering improved thermal stability and reduced fatigue, enabling effective high-intensity illumination.
Implementation Method 1
a wavelength conversion plate configured to convert the wavelength of the light emitted from the laser diodes
Implementation Method 2
a reflection unit configured to reflect the light emitted from the laser diodes to the wavelength conversion plate
Data Source
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AI summary
A laser diode comprises: a laser diode emitting light due to an electrical signal; a wavelength conversion plate for shifting the wavelength of the light emitted from the laser diode; a reflecting part for reflecting the light emitted from the laser diode towards the wavelength conversion plate; and a projecting part for emitting, in the forward direction, the light shifted by the wavelength conversion plate. The laser diode can provide a high-power but small-sized laser light source device, and a narrow emission angle can be achieved using the laser diode.