Light-Adjusting Unit Gear Rattling Elimination
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Solution Overview
Problem
Existing light-adjusting units in projectors suffer from rattling of rotation transmitting gears over time, leading to inaccurate light shielding and reduced dynamic contrast due to gear inclination and shifting, which compromises long-term high dynamic contrast performance.
Innovation Solution
Incorporating an urging member, such as a coil spring, to press and stabilize the rotation transmitting gears against a supporting substrate, eliminating gear inclination and rattling by ensuring proper alignment and smooth sliding motion, thereby maintaining accurate light-adjusting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotation transmitting gears are supported by a supporting shaft, then the gears can rotate to adjust light-shielding plate positions, but the gears become subject to inclination and rattling after long time use
Solution Approach 1:
The urging member (coil spring) applies a preliminary counteracting force to prevent the gears from inclining and rattling during rotation. By pre-applying this stabilizing force, the system counteracts the tendency of gears to become loose or inclined after prolonged use, thereby maintaining reliable operation without requiring frequent adjustments.
2Adaptability or versatility
If gears are allowed to rotate freely, then light-shielding plate position adjustment is achieved, but the position shifts due to rattling preventing accurate light shielding
Solution Approach 1:
The urging member pre-applies a stabilizing force to eliminate gaps and prevent rattling during gear rotation. This preliminary counteraction ensures that the light-shielding plate position remains accurate and does not shift during operation, thereby maintaining precise light shielding control while still allowing necessary position adjustments.
3Ease of operation
If supporting shaft is used to hold gears, then gear rotation is enabled, but gap formation between shaft and gear hole causes inclination
Solution Approach 1:
The urging member (coil spring) applies a preliminary counteracting force that pushes the gears against the supporting shaft, eliminating gaps between the shaft and gear holes. This pre-applied force maintains stable gear alignment and prevents inclination during rotation, thereby enabling smooth gear rotation while maintaining compositional stability.
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 prevents gear rattling and maintains stable rotation for long periods, ensuring high dynamic contrast is achieved and sustained, with improved accuracy and reduced noise during light-adjusting operations.
Implementation Method 1
When the urging member is formed of a coil spring, the urging member can follow the rattling generated due to vibrations or the like caused by the rotation of the rotation transmitting gears, so that the rotation transmitting gears can be stably pressed against the supporting substrate.
Data Source
AI summary
A light-adjusting unit includes: a pair of light-shielding plates arranged about an illuminating optical axis of an incoming light flux and configured to block the light flux in response to the amount of rotation; a pair of rotation transmitting gears configured to hold and rotate the pair of light-shielding plates respectively; a pair of supporting shafts configured to rotatably support the pair of rotation transmitting gears respectively; a supporting substrate on which the pair of supporting shafts are provided; and a pair of urging members configured to press and urge the pair of rotation transmitting gears respectively against the supporting substrate.