Imaging Plane Tilt Control for Inclined Object Focus
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Solution Overview
Problem
Conventional photographing apparatuses struggle to bring an entire object into focus when parts of the object are tilted relative to the optical axis, and require manual adjustments for swing-and-tilt photography, which is cumbersome and difficult to achieve high precision.
Innovation Solution
A photographing apparatus with an imaging-plane tilter, focus detector, and tilt controller that automatically adjusts the imaging plane based on focus deviation amounts detected across multiple focus areas, allowing for tilt correction to achieve focus across the entire object, even when parts are at different distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual swing-and-tilt photography with conventional interchangeable lenses is used, then swing-and-tilt photography can be achieved, but the operation becomes troublesome and difficult to carry out high-precision photography
Solution Approach 1:
The system automatically performs tilt correction by detecting focus deviations across multiple areas and driving the imaging plane tilter without user intervention. The control unit autonomously calculates tilt correction amounts and executes the correction, making the system self-servicing and eliminating the need for manual swing-and-tilt operations.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated electromechanical system. The imaging plane tilter, driven by a drive mechanism (such as a voice coil motor), substitutes for manual mechanical tilt adjustment, enabling automatic tilt correction based on focus detection results.
2Manufacturing precision
If the imaging plane is tilted to bring entire inclined objects into focus, then focus accuracy across the object is improved, but the system requires complex components and control mechanisms
Solution Approach 1:
The imaging plane is divided into multiple focus detection areas, and focus deviations are detected independently for each area. This segmentation allows the system to identify specific tilt patterns and calculate appropriate tilt correction amounts for each region, achieving precise focus across inclined surfaces.
Solution Approach 2:
The system uses focus detection results from multiple areas as feedback to automatically adjust the imaging plane tilt. The control unit receives focus deviation information, calculates the required tilt correction, and drives the imaging plane tilter to achieve optimal focus, creating a closed-loop feedback system that ensures precision without manual intervention.
3Measurement precision
If multiple focus detection areas are used to detect focus deviations, then tilt correction accuracy is improved, but the detection and measurement process becomes more complex
Solution Approach 1:
The imaging plane is divided into multiple focus detection areas arranged in a matrix pattern. Each area independently detects focus deviations, providing detailed spatial information about focus errors across different regions of the image, which enables more accurate tilt correction.
Solution Approach 2:
The same imaging plane serves multiple functions: it acts as both the light-receiving surface for image formation and the detection surface for focus measurement. The focus detection function is integrated into the imaging plane structure, allowing simultaneous image capture and focus measurement without requiring separate detection hardware.
Data Source
AI summary
A photographing apparatus includes an imaging-plane tilter configured to tilt an imaging plane, formed by a photographing optical system, relative to a plane that is orthogonal to an optical axis of the photographing optical system; a focus detector provided with a plurality of focus detection areas; and a tilt controller configured to control the imaging-plane tilter to tilt the imaging plane based on focus deviation amounts of the plurality of focus detection areas.