Lens Barrel Protrusion Light Shielding
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Solution Overview
Problem
The existing design of interchangeable lenses with large image-side protrusions for protection results in increased radial thickness and space occupation, limiting the size of the protective protrusion and potentially causing light reflection and ghosting in image-capturing apparatuses.
Innovation Solution
The lens barrel incorporates light-shielding portions within the protrusion portions to prevent light reflection, while maintaining sufficient strength and size of the protective protrusions, by strategically placing these shielding elements inside the protrusions in the radial direction and positioning them to avoid blocking essential light rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens-protective protrusion portion is increased in size to protect the final lens, then the protective function is improved, but the radial thickness increases and space occupation increases
Solution Approach 1:
The lens-protective protrusion portion is divided into multiple protrusion portions arranged circumferentially, with light-shielding portions provided inside each protrusion portion. This segmentation allows the protective function to be distributed across multiple smaller elements rather than requiring one large protrusion, reducing overall space occupation while maintaining protection capability.
Solution Approach 2:
Light-shielding portions are introduced as intermediary elements inside the protrusion portions. These light-shielding portions serve dual purposes: they prevent unwanted light reflection while allowing the protrusion portions to maintain their protective size and strength without increasing radial thickness excessively.
2Reliability
If the lens-protective protrusion portion is increased in size to protect the final lens, then the protective function is improved, but light reflection and ghost generation occur
Solution Approach 1:
Light-shielding portions are introduced as intermediary elements inside the protrusion portions. These light-shielding portions serve dual purposes: they prevent unwanted light reflection while allowing the protrusion portions to maintain their protective size and strength without increasing radial thickness excessively.
Solution Approach 2:
Light-shielding portions are selectively provided only inside the protrusion portions where they are needed to prevent light reflection, rather than coating the entire lens barrel. This localized approach addresses the reflection problem specifically at the protrusion surfaces without affecting other areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces unnecessary light reflection and allows for a sufficient-sized protective protrusion without compromising the lens barrel's space or light transmission, enhancing image quality by minimizing ghosting effects.
Implementation Method 1
light-shielding portions capable of shielding light passing though the image-side lens surface toward inner circumferential surfaces of the protrusion portions
Data Source
AI summary
The lens barrel includes an image-capturing lens unit, a mount portion including a mount member connectable to an image-capturing apparatus, and protrusion portions provided in the mount portion at multiple positions in a circumferential direction of the lens barrel. Each protrusion portion protrudes to an image side further than an image-side lens surface of a final lens disposed at a most image-side position in the image-capturing lens unit. The mount portion includes, inside the protrusion portions in a radial direction of the lens barrel, light-shielding portions capable of shielding light passing though the image-side lens surface toward inner circumferential surfaces of the protrusion portions.