Variable Aperture Blade Assembly With Pressing Structures Against Hysteresis
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Solution Overview
Problem
Conventional variable aperture assemblies in optical systems experience hysteresis during rotation, leading to discrepancies between actual and theoretical aperture sizes, affecting imaging quality in high-end electronic devices.
Innovation Solution
A variable aperture module with a blade assembly, positioning element, and driving part, featuring movable blades with positioning and movement holes, and pressing structures to ensure precise control over the light passable hole size, reducing hysteresis and aperture size discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional variable aperture assembly is used to adjust aperture size, then the depth of field can be controlled, but hysteresis occurs during rotation causing discrepancy between actual and theoretical aperture sizes
Solution Approach 1:
The aperture blade is divided into multiple independent segments (first blade segment, second blade segment, third blade segment) that can rotate independently around the optical axis. Each segment is equipped with its own pressing structure, allowing independent control and elimination of hysteresis effects that would occur in a monolithic blade design.
Solution Approach 2:
A pressing structure acts as an intermediary mechanism between the driving force and the aperture blade segments. This pressing structure applies continuous pressure to maintain contact between blade segments, eliminating gaps and hysteresis during rotation while still allowing smooth aperture adjustment.
2Reliability
If a variable aperture assembly is added to control depth of field, then imaging quality can be improved, but the device complexity increases
Solution Approach 1:
The pressing structures are integrated directly into the aperture blade segments themselves rather than being separate components. The first pressing structure is formed on the first blade segment, the second pressing structure on the second blade segment, and so on, merging the pressing function with the blade structure to reduce overall device complexity.
Solution Approach 2:
Each blade segment serves multiple functions: it forms part of the aperture opening, acts as a lever for rotation, incorporates the pressing structure for hysteresis elimination, and provides structural support. This multi-functionality reduces the need for separate components and simplifies the overall assembly.
Data Source
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AI summary
A variable aperture module (100) includes a blade assembly (110), a positioning element (120), a driving part (130) and pressing structures (140). The blade assembly (110) includes movable blades (111) disposed around an optical axis (OA) to form a light passable hole (HL) with an adjustable size. Each movable blade (111) has a positioning hole (1111) and a movement hole (1112) adjacent thereto. The positioning element (120) includes positioning structures (121) disposed respectively corresponding to the positioning holes (1111). The driving part (130) includes a rotation element (132) disposed corresponding to the movement holes (1112) and is rotatable with respect to the positioning element (1111). The pressing structures (140) are disposed respectively corresponding to the movable blades (111). Each pressing structure (140) is at least disposed into at least one of the positioning hole (1111) and the movement hole (1112) of the corresponding movable blade (111). Each pressing structure (140) at least presses against at least one of the corresponding one positioning structure (1111) and the rotation element (1112).