Interchangeable Lens Mount Dimensions for Compact Camera Systems
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Solution Overview
Problem
Existing camera systems with interchangeable lenses face challenges in achieving compact and thin designs while maintaining desired optical performance due to large image circles, which complicates the integration of lenses and camera bodies.
Innovation Solution
The camera system and interchangeable lens design specify a range of dimensions and ratios for the lens mount and flange back distances, along with aperture ratios, to ensure that the camera system can achieve compactness and high optical performance by adhering to specific conditional expressions, such as 14.0 mm≦2rM≦40.0 mm and 16.0 mm≦da≦20.0 mm, allowing for optimal lens attachment and image circle alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large image circle is used to ensure adequate coverage and optical performance, then the imaging capabilities are improved, but the camera system cannot be made compact
Solution Approach 1:
The patent applies parameter changes by precisely controlling the flange back distance (da) within 16.0-20.0 mm and the lens mount opening diameter (2rM) within 14.0-40.0 mm. By optimizing these dimensional parameters, the system achieves a compact form factor while maintaining adequate image circle coverage (14.0-20.0 mm diameter) for the imaging element, thus resolving the contradiction between compactness and optical performance.
2Volume of moving object
If the flange back distance is reduced to make the system more compact, then the camera system size is reduced, but the aperture ratio deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by establishing the relationship 2rM/da ≧ 1/F-number. By controlling the flange back distance (da) within 16.0-20.0 mm and the lens mount opening diameter (2rM) within 14.0-40.0 mm, the system achieves compact dimensions while maintaining adequate aperture ratios. The specific parameter ranges ensure that even with reduced flange back distance, the aperture ratio remains sufficient for high-quality imaging.
3Reliability
If the lens mount opening diameter is increased to improve peripheral light availability, then the optical performance is improved, but the camera system becomes less compact
Solution Approach 1:
The patent applies parameter changes by optimizing the lens mount opening diameter (2rM) within the range of 14.0-40.0 mm. This parameter optimization ensures adequate peripheral light availability for high-quality imaging while maintaining compact system dimensions. The specific range balances the need for sufficient light gathering capability with the goal of creating a compact camera system.
Data Source
AI summary
A camera system having a predetermined image circle, comprises: an interchangeable lens having a lens mount portion; and a camera body having an image sensor that is disposed within that image circle, and a body mount portion, wherein, when a radius of circular portion at a maximum internal diameter part of an opening portion of the lens mount portion is termed rM, a flange back that is a distance from the lens mount portion to a light reception surface of an image sensor in a state that the interchangeable lens and the camera body are mutually engaged is termed da, and the diameter of the image circle is termed D, the following equations are satisfied:14.0 mm≦2rM≦40.0 mm Conditional Expression #116.0 mm≦da≦20.0 mm Conditional Expression #214.0 mm≦D≦20.0 mm Conditional Expression #3.