Wavelength Conversion Device Middle Connection Layer Adhesion
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Solution Overview
Problem
Current laser projectors face issues with the adhesion of phosphor powder adhesive layers on metal substrates, leading to poor reflectivity and potential detachment, which affects the optical quality and service life of the wavelength conversion devices.
Innovation Solution
A wavelength conversion device with a middle connection layer acting as an adhesive medium between the wavelength conversion adhesive layer and the main body, ensuring firm combination and preventing the middle connection layer from reducing wavelength conversion efficiency, while maintaining high reflectivity by exposing the second region to the exciting light beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphor powder adhesive layer is directly coated on metal substrate, then wavelength conversion function is achieved, but adhesion is poor and layer falls off easily
Solution Approach 1:
A middle connection layer is introduced between the wavelength conversion adhesive layer and the main body. This intermediary layer serves as an adhesive medium that firmly combines the two components, preventing direct contact that causes poor adhesion while maintaining the wavelength conversion function.
2Reliability
If modifier is used as adhesive medium to improve adhesion, then adhesion between layers is improved, but reflectivity of metal substrate is reduced
Solution Approach 1:
The middle connection layer is applied locally only in the first region where adhesion is needed, while the second region maintains the original high reflectivity of the metal substrate. This localized application ensures that the adhesive medium does not interfere with the optical quality in the light transmission path.
3Reliability
If middle connection layer is added to improve adhesion, then adhesion strength is improved, but wavelength conversion efficiency may be reduced
Solution Approach 1:
The middle connection layer is disposed only in the first region and does not cover the second region in the light transmission path. This ensures that the exciting light beam directly contacts the wavelength conversion adhesive layer in the second region, maintaining high wavelength conversion efficiency while the first region provides adhesion support.
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 prolongs the service life of the wavelength conversion device by maintaining strong adhesive force and preventing chemical reactions that reduce reflectivity, thus enhancing the optical quality and efficiency of the laser projector.
Implementation Method 1
a phosphor powder adhesive layer is coated on a metal substrate with high reflectivity to constitute a phosphor wheel, and the laser beam (e.g. blue light) emitted by the laser light source device excites the phosphor powder adhesive layer on the metal substrate of the phosphor wheel so as to generate light beam with different colors (such as green light and yellow light)
Implementation Method 2
the laser beam can directly pass through the phosphor wheel by going through a slot on the metal substrate or via a transparent plate disposed on the metal substrate, in order to generate light with multiple colors
Data Source
AI summary
A wavelength conversion device adapted to convert a wavelength of an exciting light beam is provided. The wavelength conversion device includes a main body, a middle connection layer and a wavelength conversion adhesive layer. The main body has a reflective surface, wherein the reflective surface has a first region and a second region, and the second region is located at a transmission path of the exciting light beam. The middle connection layer is disposed on the first region and exposes the second region. The wavelength conversion adhesive layer is adhered on the middle connection layer and covers the second region, wherein the exciting light beam is adapted to pass the wavelength conversion layer to be reflected by the second region. In addition, a projector having a wavelength conversion device is also provided.