Tilt Lens Aperture Control for In-Focus Range Adjustment
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Solution Overview
Problem
Current image pickup apparatuses, such as single-lens reflex cameras, have limited tilt angles for tilt imaging, requiring adjustment of the f-number to achieve a desired in-focus range, which restricts the photographer's intent and narrows the imaging expression.
Innovation Solution
A lens apparatus with a tilting unit, aperture stop, and control unit that adjusts the aperture amount based on in-focus information to easily change the in-focus range during tilt imaging, allowing for flexible tilt and shift operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tilt angle is increased to expand the in-focus range, then the imaging expression is improved, but the f-number must be adjusted which restricts the photographer's intent and narrows the imaging expression
Solution Approach 1:
The system dynamically changes the aperture amount parameter based on the tilt angle to maintain optimal in-focus range. The control unit calculates the appropriate aperture setting corresponding to the current tilt angle, automatically adjusting the aperture stop to compensate for the tilt-induced focus changes without requiring manual f-number adjustment by the photographer.
Solution Approach 2:
The control unit receives feedback from the tilt angle detection and automatically adjusts the aperture stop accordingly. This closed-loop control ensures that the aperture setting remains optimal for the current tilt configuration, maintaining the desired in-focus range while preserving photographer intent.
2Adaptability or versatility
If the aperture amount is reduced to increase depth of field, then the in-focus range is improved, but the lighting conditions deteriorate and the imaging quality is compromised
Solution Approach 1:
Instead of reducing aperture amount to increase depth of field (which would worsen lighting), the system changes the aperture amount parameter dynamically based on tilt angle to maintain optimal in-focus range. This approach achieves the desired focus control without compromising illumination intensity or image quality.
3Reliability
If the tilt angle is limited to maintain optical system stability, then the system reliability is improved, but the adaptability for different imaging scenarios is reduced
Solution Approach 1:
The system maintains optical stability by dynamically adjusting the aperture amount parameter in response to tilt angle changes. This allows the optical system to operate reliably within stable tilt ranges while still providing adaptability for various imaging scenarios through automated aperture control.
Solution Approach 2:
The aperture stop is made dynamic, automatically adjusting its opening based on the current tilt angle. This dynamic adaptation allows the system to maintain stability while being versatile enough to handle different imaging scenarios without requiring excessive tilt angles.
Data Source
AI summary
Provided is a lens apparatus including: an optical system including: an optical system including a plurality of lenses; a tilting unit configured to change an angle of an object plane to an optical axis about with respect to an axis of rotation as a center by displacing at least a part some of the plurality of lenses; an aperture stop having configured to change an aperture amount which is changeable; an aperture stop driving unit configured to drive the aperture stop to change the aperture amount by driving the aperture stop; an in-focus information obtaining unit configured to obtain a first in-focus information of a first object which is displaced from the axis of rotation; and a control unit configured to control the aperture stop driving unit based on the first in-focus information and a drive information of the tilting unit.