Projector Grounding Paths for EMI Reduction
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Solution Overview
Problem
Conventional projector apparatuses are inadequate in reducing electromagnetic interference due to the limited use of grounding components, primarily focusing on the digital micro-mirror device, while other components like the color wheel and lens unit also contribute to interference.
Innovation Solution
A projector apparatus with multiple grounding components, including a first and second grounding component, and a conducting member to establish multiple grounding paths between the internal projector module and the housing parts, effectively addressing electromagnetic interference from various sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only a single grounding component is provided above the digital micro-mirror device, then the grounding path for that specific component is established, but electromagnetic interference from other components (color wheel, lens unit) remains unaddressed
Solution Approach 1:
The patent divides the grounding system into multiple independent grounding components positioned at different locations (above the digital micro-mirror device, and at other positions within the housing) to address electromagnetic interference from multiple separate components. Each grounding component handles interference from its nearby component, achieving comprehensive coverage through segmentation of the grounding function.
Solution Approach 2:
The patent transitions from a single-point grounding approach to a distributed multi-point grounding arrangement within the three-dimensional housing space. By positioning grounding components at multiple locations (upper housing part, lower housing part, and other positions), the grounding system expands into multiple spatial dimensions, effectively capturing electromagnetic interference from components throughout the entire housing volume.
2Object-affected harmful factors
If grounding components are added to address electromagnetic interference from multiple components, then electromagnetic interference protection is improved, but device complexity increases
Solution Approach 1:
The housing itself serves as a universal grounding structure that accommodates multiple grounding components. The upper housing part and lower housing part both function as grounding references, allowing multiple grounding components to be integrated without requiring separate complex grounding systems for each component. This multi-functional use of the housing simplifies the overall structure while maintaining comprehensive grounding coverage.
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 effectively reduces electromagnetic interference by creating multiple grounding paths, enhancing protection against electromagnetic noise and ensuring that noise is grounded before it can be radiated as electromagnetic waves.
Implementation Method 1
the grounding component 3 is sandwiched between the upper housing part 12 and the digital micro-mirror device so as to establish a grounding path between the digital micro-mirror device and the housing 1
Data Source
AI summary
A projector apparatus has an electrically conductive housing that includes a lower housing part and an upper housing part coupled to the lower housing part for covering the lower housing part, an internal projector module mounted in the housing, a first grounding component provided between the internal projector module and the upper housing part so as to establish a first grounding path between the internal projector module and the housing, and a second grounding component provided between the internal projector module and the lower housing part so as to establish a second grounding path between the internal projector module and the housing.