Dynamic Light Shielding Member for Lens-Interchangeable Cameras
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Solution Overview
Problem
In lens-interchangeable image pickup apparatuses, such as digital single-lens reflex cameras, unnecessary light enters the image pickup device due to the fixed opening area, causing flare and ghost issues, especially when smaller lenses are mounted, and existing solutions require additional attachments or are not practical for all lens barrels.
Innovation Solution
An image pickup apparatus with a light shielding member between the lens unit and the image pickup device, whose opening amount is adjusted based on the mounted lens unit, using a control unit to determine the optimal opening size for effective light flux, thereby reducing unnecessary light entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the opening area of the light shielding member is determined according to the largest lens, then large lenses can be accommodated, but unnecessary light enters when smaller lenses are mounted causing flare and ghost
Solution Approach 1:
The light shielding member's opening area is made dynamically adjustable based on the mounted lens characteristics. The control unit receives lens information and automatically adjusts the light shielding member to provide the optimal opening area for each specific lens, preventing unnecessary light entry while maintaining compatibility with various lens sizes.
Solution Approach 2:
The opening area parameter of the light shielding member is changed according to the lens mounted. By varying the opening area parameter to match the specific lens characteristics, the system achieves both adaptability to different lens sizes and prevention of flare/ghost effects.
2Object-affected harmful factors
If a hood or matte box is attached to prevent unnecessary light, then flare and ghost are reduced, but the configuration becomes complex and adjustments are difficult
Solution Approach 1:
The light shielding function is merged with the camera body's internal structure. Instead of using separate external attachments like hoods or matte boxes, the light shielding member is integrated into the camera body and controlled electronically, simplifying the overall configuration while maintaining effective flare and ghost prevention.
Solution Approach 2:
The system automatically adjusts the light shielding member based on lens information received from the mounted lens. This self-service mechanism eliminates the need for manual adjustment by the photographer, making the system easy to operate while maintaining optimal light shielding performance.
3Ease of manufacture
If the light shielding member is fixed in position, then the structure is simple, but it cannot adapt to different lens barrels causing suboptimal performance
Solution Approach 1:
The light shielding member transitions from a fixed structure to a dynamically adjustable one. The control unit enables automatic adjustment of the light shielding member's opening area based on the mounted lens characteristics, maintaining structural simplicity in the base design while adding adaptability through electronic control.
Data Source
AI summary
An image pickup apparatus on and from which a lens unit can be mounted and removed. The image pickup apparatus includes an image pickup device, a mount part on and from which a lens unit is mounted and removed on the image pickup apparatus, a light shielding member that is provided between the image pickup device and the mount part, and shields light in a peripheral part of a light flux guided by the lens unit by adjusting an opening amount in a photographic optical path. The opening amount of the light shielding member is controlled based on information on the lens unit mounted on the mount part.