Iris Drive Rail Structure for Tilt-Free Rotational Guidance
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Solution Overview
Problem
Conventional iris driving devices suffer from reduced precision due to intermittent rotation and tilting of the rotator caused by mismatched rail curvatures and clearance-based designs, leading to decentering and decreased performance.
Innovation Solution
A rail structure with V-shaped cross sections and strategically arranged balls between facing rails, along with a guiding unit, ensures continuous point-contact and accurate rotational guidance, minimizing tilt and load, thereby enhancing driving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a ball is placed between rails with mismatched curvatures to reduce friction, then friction is reduced, but the ball acts as a load on rotation causing intermittent movement and tilting
Solution Approach 1:
The patent changes the curvature radius parameter of the rails to be exactly matched between the stator and rotator. This parameter adjustment ensures that the ball bearing maintains continuous point contact throughout the rotation, eliminating the intermittent movement and tilting caused by curvature mismatch while still reducing friction.
2Force
If clearance is left between the ball and rail to avoid loading, then the ball does not act as a load, but the rotator deviates from the center of rotation (decentering)
Solution Approach 1:
The patent optimizes the curvature radius parameter so that the ball fits precisely between the matched rails without requiring clearance. This exact fit allows the ball to support the rotator while maintaining continuous contact, thereby preventing both loading issues and decentering simultaneously.
3Stability of the object's composition
If three or more rails are installed to support the rotator, then horizontal support is provided, but it is impossible to exactly match the curvature radii of three or more rails
Solution Approach 1:
The patent establishes a precise curvature radius parameter for the rails that can be consistently manufactured and matched. By focusing on getting this parameter exactly right, the system achieves both horizontal support stability and curvature matching precision, overcoming the manufacturing difficulty of matching multiple rails.
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 improved rail structure and ball arrangement maintain horizontal balance and prevent rotational deviations, resulting in enhanced precision and efficiency of the iris driving apparatus.
Implementation Method 1
first rails respectively provided on the stator and the rotator to face each other and having an arc shape, the first rails having a vertical cross section of a V shape; a plurality of first balls arranged between the first rails
Implementation Method 2
a ball is interposed between the moving body and the fixed body to reduce friction and improve driving precision
Implementation Method 3
the amount of light entering the lens is precisely controlled by controlling the direction and amount of movement of the blade using an electromagnetic force or magnetic force between the coil and the magnet
Implementation Method 4
the amount of light entering the lens is precisely controlled by controlling the direction and amount of movement of the blade using an electromagnetic force or magnetic force between the coil and the magnet
Data Source
AI summary
An apparatus for driving an iris according to an embodiment includes a rotator configured to rotate based on a stator, a plurality of blades connected to the stator and the rotator and configured to rotate by the rotation of the rotator, first rails respectively provided on the stator and the rotator to face each other and having an arc shape, the first rails having a vertical cross section of a V shape, a plurality of first balls arranged between the first rails, and a guiding unit arranged between the stator and the rotator in an area where the first ball is not arranged.