Projector Metal Member Air Layer EMI Noise Attenuation
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Solution Overview
Problem
High-luminance projectors using metal members to hold light modulation devices and prisms suffer from electromagnetic interference (EMI) noise emission due to the propagation of EMI noise through the metal members and glass prisms, affecting external electronic equipment.
Innovation Solution
Incorporating an air layer in the facing area between the metal members and the prism, along with adhesive layers, to attenuate EMI noise while maintaining the positional accuracy and bonding strength between the metal members and the prism, thereby reducing EMI noise emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal members are used to hold light modulation devices and prisms, then positional accuracy and bonding strength are improved, but EMI noise emission increases
Solution Approach 1:
The facing area between the metal member and prism is segmented into multiple regions: adhesive layers at the peripheral portions for bonding, and an air layer in the intermediate area for EMI noise attenuation. This segmentation allows each region to perform its specific function optimally.
Solution Approach 2:
The air layer acts as an intermediary substance between the metal member and prism, interrupting the EMI noise propagation path while the adhesive layers serve as intermediaries for mechanical bonding. This mediator approach resolves the contradiction by introducing a third element with different properties.
2Strength
If adhesive layers are used to bond metal members and prisms, then bonding strength is improved, but EMI noise propagation increases
Solution Approach 1:
Different regions of the interface between metal member and prism have different qualities: peripheral portions use adhesive layers with high bonding strength for mechanical attachment, while the intermediate area uses air layer with low permittivity for EMI noise attenuation. This local differentiation resolves the contradiction.
Solution Approach 2:
The bonding interface is segmented into multiple functional zones: adhesive layers positioned at specific peripheral locations for strength, and air layer occupying the intermediate space for EMI noise reduction. This segmentation allows simultaneous optimization of both bonding strength and EMI noise attenuation.
3Object-generated harmful factors
If air layer is introduced between metal members and prism, then EMI noise propagation is reduced, but bonding strength decreases
Solution Approach 1:
The air layer serves as an intermediary that specifically targets EMI noise attenuation without compromising mechanical bonding, as the bonding function is handled by the adhesive layers at the periphery. This mediator approach allows the air layer to focus on its primary function of noise reduction.
Solution Approach 2:
The air layer is positioned in the intermediate area where it can effectively attenuate EMI noise without interfering with the bonding function, which is localized to the peripheral adhesive layers. This spatial differentiation of functions resolves the contradiction between EMI noise reduction and bonding strength.
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 air layer and adhesive combination effectively reduces EMI noise propagation, ensuring strong bonding and minimizing noise interference, thus enhancing the projector's operational performance and reducing electromagnetic interference emissions.
Implementation Method 1
an air layer is disposed in a facing area where the first metal member and the prism face each other
Data Source
AI summary
A projector includes a first light modulator configured to emit first image light beam, a second light modulator configured to emit second image light beam, a prism configured to combine the first image light beam and the second image light beam with each other, a first metal member configured to couple the first light modulator and the prism to each other, a lens configured to project light beam combined by the prism, a second metal member configured to support the lens, and a third metal member configured to couple the prism and the second metal member to each other. An air layer is disposed in a facing area where the first metal member and the prism face each other.