Aperture Blade Mechanism for Circular Light Passage
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Solution Overview
Problem
Existing light amount adjustment devices, such as diaphragm devices, face challenges in forming a desired aperture shape, particularly in transitioning from a polygonal shape to a circular shape, which affects image quality due to the interference and movement constraints of aperture blades.
Innovation Solution
A light amount adjustment device comprising at least one first blade moving rectilinearly and at least one second blade pivoting within a plane, allowing the formation of a polygonal aperture shape that transitions to a circular shape by annularly superposing the blades, thereby increasing the number of sides and reducing the rectilinear movement of blades, facilitating downsizing and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aperture blades move linearly to form a polygonal aperture shape, then the device structure is simple, but the aperture shape cannot transition to a circular shape effectively
Solution Approach 1:
The aperture blades are divided into two distinct groups: first blades that move rectilinearly and second blades that pivot. This segmentation allows each group to perform a specific function - the first blades provide structural simplicity while the second blades enable shape transformation from polygonal to circular, resolving the contradiction between manufacturing ease and shape quality.
Solution Approach 2:
The invention introduces dynamic movement characteristics by allowing second aperture blades to pivot in addition to the rectilinear movement of first blades. This dynamic capability enables the aperture shape to change from polygonal at smaller openings to circular at larger openings, solving the shape limitation while maintaining structural simplicity through the combination of movement types.
2Shape
If multiple aperture blades are used to form a circular aperture shape, then the aperture shape quality improves, but the device complexity increases
Solution Approach 1:
Different parts of the aperture blade system have different movement characteristics - first blades move rectilinearly while second blades pivot. This local differentiation in movement quality allows the system to achieve circular aperture shapes without requiring all blades to perform complex movements, thereby reducing overall device complexity while maintaining shape quality.
Solution Approach 2:
The invention merges two types of blade movements (rectilinear and pivoting) into a single coordinated system. By combining these movement types and annularly superposing the blades, the system achieves circular aperture shapes with controlled complexity, as the two movement types work together rather than requiring entirely complex individual blade designs.
3Reliability
If aperture blades are constrained to prevent interference, then the reliability improves, but the ease of operation decreases
Solution Approach 1:
The invention resolves blade interference issues by utilizing different movement dimensions - first blades move in rectilinear paths while second blades pivot around fixed points. This dimensional differentiation in blade movement allows blades to operate in different spatial planes, preventing interference while maintaining smooth operation and reliability.
Data Source
AI summary
A device according to the present invention includes at least one first light amount adjustment blade moving rectilinearly in a direction crossing a light passage direction and at least one second light amount adjustment blade pivoting within a plane crossing the light passage direction. When a light passage aperture of a polygonal shape formed by annularly superposing the first light amount adjustment blade and the second light amount adjustment blade is enlarged, a shape of the light passage aperture comes close to a circular shape from a polygonal shape.