Elastic Frame Sealing for Miniature Projection Light Valves
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Solution Overview
Problem
Miniaturization projection devices face challenges in maintaining image quality due to dust interference, as existing anti-dust designs are inadequate for ensuring the integrity of the light path between the field lens and the light valve component.
Innovation Solution
A light valve module with an elastic frame that deforms to seal the space between the field lens and the light valve component, using recesses to maintain the light beam path while creating a pressure difference for effective sealing, preventing dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid sealing structure is used between the field lens and the light valve component, then the anti-dust performance is improved, but the assembly tolerance requirement becomes too strict and the device complexity increases
Solution Approach 1:
The patent uses an elastic frame with pressing portions that can deform elastically to seal the space between the field lens and light valve component. This flexible sealing approach replaces rigid sealing structures, allowing assembly within normal tolerances while maintaining effective dust prevention. The elastic frame compresses to fill gaps and create a dust-proof seal without requiring precision machining or complex rigid sealing mechanisms.
2Reliability
If the elastic frame is pressed to seal the space, then the anti-dust performance is improved, but the light beam path may be affected
Solution Approach 1:
The elastic frame is designed with differentiated regions: pressing portions that deform to create seals against the field lens and light valve component, and a light beam passing portion that remains open and undeformed to allow uninterrupted light transmission. This local differentiation enables the frame to simultaneously achieve dust sealing through localized compression while maintaining optical clarity in the light path region.
Solution Approach 2:
The elastic frame is segmented into functionally distinct zones: sealed pressing portions for dust prevention and an open light beam passing portion for optical transmission. This segmentation allows each region to perform its specific function optimally without interfering with the other, resolving the contradiction between sealing effectiveness and light transmission.
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 seals the space between the field lens and the light valve component, ensuring high image quality by preventing dust interference and maintaining the light beam path, thus enhancing the performance of miniaturization projection devices.
Implementation Method 1
A pressed portion of the elastic frame is deformed towards the recess when the field lens and the light valve component press the elastic frame
Implementation Method 2
the deformation of the pressed portion of the elastic frame unlikely affects the original contour of the opening of the elastic frame so as to avoid affecting the passing of the light beam
Data Source
AI summary
A light valve module and a projection device using thereof are provided. The projection device includes a chassis, a light source, a projection lens, the light valve module and a fastener assembly. The light valve module is configured within a cavity of the chassis by the fastener assembly and disposed on a transmission path of a light beam so as to convert the light beam to an image light beam. The light valve module includes a field lens, a light valve component and an elastic frame. First and second surfaces of the elastic frame respectively contact the field lens and the light valve component. A recess of the elastic frame is located on one of the first surface and the second surface. A pressed portion of the elastic frame is deformed towards the recess when the field lens and the light valve component press the elastic frame.