Ring Packing Sealing for Projector Light Source Dust Ingress
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Solution Overview
Problem
Conventional light source units in projectors lack effective dust-proof sealing, leading to reduced luminance and optical property deterioration due to foreign matter ingress, which can cause optic members to deviate from their designed positions.
Innovation Solution
A light source unit design featuring a fixing target member with a frame portion, a packing with a groove, a core member, and a pressing member, such as a heat sink, to create a hermetically closed construction by applying lateral pressure and sealing the gap between the fixing target member and the light source case, reducing the risk of positional deviation and dust ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetically closed construction is implemented to prevent dust ingress, then dust-proof performance is improved, but the complexity of the sealing structure increases
Solution Approach 1:
The patent employs a packing member (sealing ring) made of flexible material that is compressed between the frame portion and the fixing target member to create a hermetic seal. This flexible film approach provides effective dust-proof sealing while maintaining relatively simple structural implementation, directly resolving the contradiction between sealing effectiveness and structural complexity.
2Object-affected harmful factors
If a dust-proof sealing member is disposed between the case and fixing target member, then foreign matter ingress is prevented, but the fixing target member may deviate from its designed position
Solution Approach 1:
The patent applies the sealing function locally at the interface between the frame portion and the fixing target member using a packing member, rather than requiring the entire assembly to be complex. This localized sealing approach prevents foreign matter ingress while maintaining the positional accuracy of the fixing target member, as the sealing is achieved through compression of the packing material at the specific sealing interface without affecting the overall positioning.
3Illumination intensity
If the holder is sealed from the case, then luminance reduction due to dust is prevented, but the holder may deviate from its designed position
Solution Approach 1:
The packing member serves as a flexible sealing film that is compressed between the frame portion and the holder (fixing target member). This flexible sealing approach protects the holder and optical components from dust ingress that would cause luminance reduction, while the localized nature of the compression seal maintains the holder's positional accuracy without requiring complex positioning mechanisms.
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 enhances dust-proof performance, maintains optical precision, and prevents foreign matter from entering the light source unit, thereby ensuring consistent light quality and reducing the risk of optic member deviation.
Implementation Method 1
a packing (91) formed into a ring shape that surrounds lateral sides of the holder (74)
Implementation Method 2
a heat sink for the holder that is brought into abutment with the holder while pressing the core member
Data Source
AI summary
An electronic device according to embodiments of the invention include a fixing target member, a fixing portion having formed thereon a frame portion that is erected around a circumference of the fixing target member, a packing having a groove and disposed between the frame portion and the fixing target member, a core member disposed in the groove, and a pressing member that presses the core member towards the packing.