Blade Driving Device Aperture Circularity Size Reduction
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Solution Overview
Problem
Conventional diaphragm devices require multiple pivot centers and dowels, making them bulky and difficult to miniaturize while maintaining a circular aperture shape.
Innovation Solution
A blade driving device with multiple groups of diaphragm blades pivoting around a central opening, using a driving ring and base member with cam grooves and pins to form circular light passage openings of varying diameters, reducing the need for multiple pivot centers and dowels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If multiple pivot centers and dowels are used to form a circular aperture, then the aperture shape circularity is improved, but the device size increases
Solution Approach 1:
The patent merges multiple pivot centers into a single integrated pivot member. The pivot member contains multiple pivot centers that are integrated into one component, eliminating the need for separate pivot centers and dowels. This consolidation maintains the circular aperture shape while reducing the overall device volume by removing redundant structural elements.
Solution Approach 2:
The pivot member serves multiple functions simultaneously: it acts as both the pivot mechanism and the structural support element. By making the pivot member universal, it replaces the need for separate dowels and multiple pivot centers, achieving size reduction while maintaining aperture circularity through its multi-functional design.
2Shape
If multiple diaphragm blade groups are used to form circular apertures, then the aperture shape quality is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple diaphragm blade groups into a single integrated diaphragm blade assembly. The blade groups are arranged and connected to work together as one unit, reducing device complexity while maintaining high aperture shape quality. The integration eliminates the need for separate control mechanisms for each blade group.
Solution Approach 2:
The diaphragm blade groups are designed to perform multiple functions within a unified structure. They collectively form circular apertures of various sizes and shapes through coordinated movement, reducing the need for separate mechanisms and simplifying the overall device complexity while maintaining shape quality.
3Volume of moving object
If a single pivot member is used to reduce device size, then the device volume is reduced, but the ability to maintain circular aperture shape across all aperture sizes becomes challenging
Solution Approach 1:
The single pivot member is segmented into multiple pivot centers within its structure. This segmentation allows different portions of the diaphragm blade groups to pivot around different centers, enabling the formation of circular apertures of various sizes while maintaining high circularity. The segmented design within the unified pivot member resolves the contradiction between size reduction and shape maintenance.
Solution Approach 2:
The pivot member is designed with dynamic characteristics that allow it to adapt its pivot centers based on the required aperture size. As the aperture size changes, the effective pivot centers within the single pivot member adjust dynamically, maintaining circular aperture shape across the full range of aperture sizes while keeping the device compact.
Data Source
AI summary
A blade driving device includes an opening forming member, and a plurality of groups of blades that are pivotably disposed in a ring form around an opening portion of the opening forming member. The plurality of groups of blades include a first group of blades and a second group of blades, in a process of changing from a first circular light passage opening formed by the first group to a second circular light passage opening formed by the second group, the first group that is adjacent to the second group and has finished forming the first circular light passage opening remains in the opening portion, thereby acting to substantially suppressing warp, in an optical axis direction, of the second group that forms the second circular light passage opening on an inner side thereof.