Optical Element Fixing Rod Structure for Stable Projection Brightness
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Solution Overview
Problem
Conventional fixing mechanisms for optical elements in projection devices fail to accurately match the thickness of the optical element with the slot width, leading to vibration and uneven brightness distribution due to light shift.
Innovation Solution
A fixing mechanism comprising first and second fixing rods with grooves and abutting portions that securely hold the optical element, compensating for manufacturing tolerances to reduce light deviation and improve brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical element is fixed using a conventional slot mechanism, then the manufacturing process is simple, but the light transmission becomes unstable due to thickness mismatch and vibration
Solution Approach 1:
The fixing mechanism is divided into multiple functional components: a slot for basic positioning, an extending portion for lateral adjustment, and an abutting portion for final stabilization. This segmentation allows each component to address specific aspects of the fixing problem, improving light transmission stability while maintaining manufacturing simplicity.
Solution Approach 2:
The extending portion is designed to be flexible rather than rigid, allowing it to dynamically adapt to thickness variations in the optical element. This dynamic characteristic enables the mechanism to accommodate manufacturing tolerances and prevent vibration, resolving the contradiction between simple structure and reliable light transmission.
2Manufacturing precision
If the slot width is designed to match the optical element thickness, then the fit should be precise, but manufacturing tolerances cause mismatch and vibration
Solution Approach 1:
The fixing mechanism introduces an adjustable parameter through the extending portion, which can flexibly change its effective length to compensate for thickness mismatches caused by manufacturing tolerances. This parameter change capability ensures stable optical element positioning without requiring extremely precise manufacturing.
Solution Approach 2:
The extending portion acts as an intermediary between the rigid slot and the optical element, absorbing the dimensional discrepancies caused by manufacturing tolerances. This intermediary component protects the overall system stability by accommodating variations in optical element thickness.
3Illumination intensity
If the optical element vibrates due to poor fixation, then the structure remains simple, but the projected image shows uneven brightness distribution
Solution Approach 1:
The abutting portion is designed to automatically engage with the optical element's side surface, providing self-stabilization without requiring additional active components or complex control mechanisms. This self-service approach ensures brightness uniformity while keeping the overall device structure relatively simple.
Data Source
AI summary
A fixing mechanism provided for fixing an optical element includes a first fixing rod and a second fixing rod. The first fixing rod has a first sidewall and forms a first groove. The first sidewall is connected to a first extending portion protruding outward from the first sidewall and a first abutting portion. The first groove is located beside the first extending portion. The first extending portion is connected between the first sidewall and the first abutting portion. The second fixing rod has a second sidewall and forms a second groove. The second groove faces the first groove. A first end of the optical element is accommodated in the first groove, and a second end of the optical element is accommodated in the second groove. The first abutting portion abuts against the optical element thereby fixing the optical element in the fixing mechanism. A projection device is also provided.