Projection Optical Engine Dust-Proof Structure for Debris Containment
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Solution Overview
Problem
In projection devices, manufacturing tolerances and assembly errors can cause the integration rod to deviate from its original position, leading to reduced brightness and debris generation that affects image quality by adhering to optical elements.
Innovation Solution
A dust-proof structure with a partition plate, cavity structure, and adjustment elements is implemented, where debris generated during adjustment is directed into a cavity structure, preventing it from entering the chamber and adhering to optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screw is rotated for displacement to adjust the integration rod position, then the integration rod position can be adjusted, but debris is generated due to friction with the base and falls into the chamber adhering to optical elements
Solution Approach 1:
The base is divided into two separate chambers by a partition wall: a first chamber for housing the screw mechanism and a second chamber for housing the integration rod. This segmentation isolates the debris-generating screw mechanism from the debris-sensitive optical components, allowing the screw to be rotated for adjustment without contaminating the optical path.
Solution Approach 2:
The partition wall acts as an intermediary barrier between the screw mechanism and the integration rod. It allows the screw to perform its adjustment function while preventing direct contact between the screw and optical elements, thus eliminating the harmful effect of debris adhesion to optical components.
2Manufacturing precision
If the integration rod is adjusted by displacing the screw, then the light homogenization can be improved, but manufacturing tolerances and assembly errors cause deviation from the original position
Solution Approach 1:
By segmenting the base into separate chambers, the patent creates an isolated adjustment mechanism that can precisely control the integration rod position without being affected by manufacturing tolerances and assembly errors in other components. The separated structure allows for more precise positioning control.
3Ease of operation
If debris falls into the chamber and adheres to the integration rod or lens set, then the projection device can be adjusted, but dirt or shadow appears on the projected image affecting display brightness
Solution Approach 1:
The partition wall creates physical separation between the adjustment mechanism and the optical components, preventing debris from falling into the chamber and adhering to the integration rod or lens set. This eliminates the harmful effect of dirt or shadow on the projected image while maintaining adjustment capability.
Solution Approach 2:
The partition wall serves as an intermediary barrier that allows the screw mechanism to operate for adjustment while preventing debris from reaching the optical elements. This mediator structure protects the optical path from contamination, maintaining image quality during adjustment operations.
Data Source
AI summary
A dust-proof structure applicable to an optical engine module of a projection device is provided. The optical engine module includes a base with a chamber, and the dust-proof structure includes a partition plate, a cavity structure, an adjustment hole, and an adjustment element. The partition plate is one part of the base and a side wall of the chamber. The cavity structure is disposed in the base, and the partition plate is located between the cavity structure and the chamber. The adjustment hole passes through the partition plate and the other part of the base and communicates with the chamber and the cavity structure. The adjustment element passes through the adjustment hole and partly corresponds to the cavity structure. The adjustment element is suitable for moving relative to the adjustment hole, such that debris generated during movement of the adjustment element is suitable for falling into the cavity structure.