Motorless Wavelength Conversion Element for Compact Projection Illumination
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Solution Overview
Problem
Existing projection devices face challenges in miniaturization due to the space occupied by motors in fluorescent wheels, necessitating an optical architecture that reduces size while maintaining effective wavelength conversion.
Innovation Solution
A wavelength conversion element that includes a rotating member with a wavelength conversion material, allowing for the conversion of a laser beam into a conversion beam, and featuring a light-transmitting area surrounded by the rotating member to improve space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorescent wheel with motor is used for wavelength conversion, then effective wavelength conversion can be achieved, but the device size increases due to the motor occupying space
Solution Approach 1:
The patent extracts and removes the motor from the fluorescent wheel structure, retaining only the necessary wavelength conversion material on the rotating member. This eliminates the space-consuming motor while preserving the core wavelength conversion function, directly addressing the contradiction between conversion effectiveness and device size.
Solution Approach 2:
The patent replaces the traditional motor-driven mechanical system with a motorless rotating member that can be rotated by optical means (such as optical tweezers or acoustic radiation pressure). This substitution eliminates the mechanical motor's space requirements while maintaining the ability to rotate the wavelength conversion material for effective wavelength conversion.
2Reliability
If the rotating member is added to drive wavelength conversion material, then wavelength conversion function is improved, but the light-transmitting area is reduced
Solution Approach 1:
The patent applies local quality by making the rotating member transparent or translucent in the light-transmitting area, allowing light to pass through while maintaining the rotational function. This localized transparency preserves the light-transmitting area's functionality while the rotating member continues to drive the wavelength conversion material, resolving the contradiction between conversion function and light transmission area.
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 proposed solution effectively converts the wavelength of a beam and optimizes the use of space within the wavelength conversion element, contributing to a reduction in the overall size of the illumination system and projection device.
Implementation Method 1
The wavelength conversion material is configured to convert a laser beam into a conversion beam
Data Source
AI summary
A wavelength conversion element is adapted to rotate around a rotation axis. The wavelength conversion element includes a rotating member and a wavelength conversion material. The wavelength conversion material is arranged on the rotating member. The wavelength conversion material is configured to convert a laser beam into a conversion beam. The rotating member is configured to drive the wavelength conversion material to rotate around the rotation axis. The wavelength conversion element has a light-transmitting area. The light-transmitting area is surrounded by the rotating member. The light-transmitting area is configured to allow at least one of the laser beam and the conversion beam to pass through.