Aperture Blade Warpage Suppression via Intermediary Support
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Solution Overview
Problem
Conventional blade drive devices experience upward warpage of blades due to inclined cam grooves, leading to malfunctions and operational issues.
Innovation Solution
A light shielding unit comprising a first frame, a second frame, movable blades, a drive ring, and supports that suppress upward warpage by using protrusions on the drive ring and cover to maintain the blades' position and prevent snagging, ensuring smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inclined cam grooves are used to drive the movable blades, then the blades can be driven to adjust the opening area, but upward warpage of the blades occurs causing malfunctions
Solution Approach 1:
A support member is introduced as an intermediary component between the cam groove mechanism and the movable blade. This support member contacts the blade at a specific position to prevent upward warpage during blade movement, thereby eliminating the malfunction caused by the inclined cam groove while maintaining smooth blade operation.
Solution Approach 2:
The support member is positioned to preemptively counteract the upward warpage force generated by the inclined cam groove before the blade can deform. By providing preliminary support at the contact position, the blade is prevented from warping upward during the opening/closing operation, thus maintaining operational reliability.
2Object-affected harmful factors
If the movable blades are driven to reduce the opening area, then light shielding is improved, but upward warpage causes malfunction
Solution Approach 1:
The support member acts as a mediator that enables the blade to achieve complete closure (maximum light shielding) without experiencing upward warpage-induced malfunctions. The support prevents deformation during the closing action, allowing the blade to reliably reach its fully closed position.
Solution Approach 2:
The support member provides preliminary counteraction to the warpage force that would otherwise prevent the blade from fully closing. This ensures the blade can reliably achieve maximum light shielding while maintaining operational reliability throughout the closing process.
3Ease of manufacture
If the blade structure is simplified for easy manufacture, then production cost is reduced, but blade warpage control becomes difficult
Solution Approach 1:
The blade support system is segmented into a separate support member component that can be independently manufactured and then assembled to the blade assembly. This segmentation allows each component to be manufactured using simple, cost-effective processes while the assembled system achieves precise blade position control through the support member's geometric features.
Solution Approach 2:
The support member provides localized quality enhancement by concentrating the warpage prevention function at a specific contact position on the blade. This localized support achieves precise blade position control without requiring complex manufacturing throughout the entire blade structure, maintaining ease of manufacture while ensuring positional precision.
Data Source
AI summary
An aperture unit includes a base plate, a cover, a plurality of aperture blades, a drive ring, and protrusions. The aperture blades are disposed between the base plate and the cover, and adjust the amount of light passing through by varying the size of an opening. The drive ring is disposed between the base plate and the cover, and is rotationally driven when the aperture blades are opened and closed. The protrusions are provided to the drive ring and the cover, respectively, and support the aperture blades in the direction of suppressing upward warpage of the aperture blades in a state in which the aperture blades move in the direction of reducing the size of the opening.