Divided Dust-Proof Case for Projection Display Sealing
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Solution Overview
Problem
The sealed structure of projection type display devices increases the number of parts required for cooling, leading to deteriorated assemblability and potential dust ingress, which affects luminance.
Innovation Solution
A display device with a dust-proof case that can be divided into two housings, featuring a second positioning member fitting with a first positioning member, a mounting seat surface for screwing the light source unit, and a pinching portion to sandwich the final optical member, simplifying sealing without increasing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed structure is used to prevent dust ingress, then dust-proofing is improved, but the number of parts increases and assemblability deteriorates
Solution Approach 1:
The dust cover integrates multiple functions into a single component: it seals the illumination optical system to prevent dust ingress, positions the light source unit through integrated positioning protrusions, and provides mounting surfaces. This merging eliminates the need for separate sealing parts and positioning members, reducing part count while maintaining dust-proofing reliability.
Solution Approach 2:
The dust cover serves multiple purposes simultaneously: it acts as a sealing barrier against dust, a positioning structure for the illumination optical system, a mounting base for the light source unit, and a structural element that maintains the enclosed environment. This multi-functionality resolves the contradiction by achieving dust-proofing without adding extra parts.
2Reliability
If multiple sealing parts are used to prevent dust ingress, then dust-proofing is improved, but assemblability deteriorates
Solution Approach 1:
The dust cover combines sealing, positioning, and mounting functions into a single integrated component, eliminating the need for multiple separate sealing parts. This integration simplifies the assembly process while maintaining effective dust-proofing, directly resolving the contradiction between dust-proofing reliability and assemblability.
3Reliability
If the illumination optical system is enclosed in a sealed box, then dust-proofing is improved, but cooling efficiency deteriorates
Solution Approach 1:
The dust cover is designed as a divided structure with separate sections that can be assembled independently. This segmentation allows for integrated cooling channels to be formed within the dust cover itself, enabling heat dissipation pathways that do not compromise the sealed dust-proof environment. The cooling function is embedded within the sealing structure rather than requiring separate cooling components.
Data Source
AI summary
Illumination optical system (101) for outputting light to a projection lens, light source unit (102) for outputting light to illumination optical system (101), and dust-proof case (103) houses illumination optical system (101) and can be divided into two housings are provided, and the dust-proof case (103) has second positioning member (105-1), (105-2) provided on the outer surface of dust-proof case (103) and fitted to and first positioning member (104-1), (104-2) provided in light source unit (102), mounting seating surface (106) provided on the outer surface of the dust-proof case (103) for screwing light source unit (102), and pinching portion (107) for sandwiching a final optical member of light source unit (102) sandwiched between two housings.