Lens Controller View Angle Correction During Auto Focus
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Solution Overview
Problem
Existing lens controllers with view angle correction functions cannot prevent view angle variations during auto focus (AF) control, as they rely on specified target positions which are not available during AF operations.
Innovation Solution
Incorporating an AF control device that automatically focuses the lens and a view angle correction device that moves the zoom lens to maintain a constant angle of view by detecting the current focus position and adjusting the zoom accordingly, ensuring view angle stability during both manual focus (MF) and AF control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MF control is used to move the focus to a target position, then the view angle correction can be performed by obtaining zoom position based on the target position, but during AF control the target position is not specified so view angle correction cannot be performed in the same way
Solution Approach 1:
The patent applies dynamics by transitioning from static target position-based zoom correction (MF mode) to dynamic real-time focus position detection (AF mode). The position detecting device continuously monitors the actual focus position during AF operation, and the view angle correction device dynamically adjusts the zoom position based on this real-time feedback, enabling adaptive correction without predetermined target positions.
Solution Approach 2:
The patent implements feedback by using the position detecting device to monitor the actual focus position during AF control and feeding this information back to the view angle correction device. This closed-loop feedback mechanism allows the system to automatically adjust the zoom position based on the actual focus position, eliminating the need for predetermined target positions and enabling view angle correction throughout the AF process.
2Extent of automation
If the focus is moved during AF control without view angle correction, then the autofocus function can operate automatically, but a view angle variation associated with focus movement occurs
Solution Approach 1:
The patent merges the AF control function and view angle correction function into a coordinated system. The position detecting device monitors focus position changes during AF operation, and the view angle correction device simultaneously adjusts the zoom position to compensate for view angle variations. This combined approach maintains both automatic focus control and angle of view stability throughout the focusing process.
Solution Approach 2:
The position detecting device acts as an intermediary between the AF control device and the view angle correction device. It detects the actual focus position during AF operation and provides this information to the view angle correction device, which then calculates and executes the appropriate zoom position adjustment. This intermediary mechanism enables coordinated operation of both functions.
3Adaptability or versatility
If a position detecting device is added to detect current focus position during AF control, then view angle correction can be performed during AF, but the device complexity increases
Solution Approach 1:
The position detecting device serves multiple functions: it detects the focus position during AF control for view angle correction, and can potentially serve other control purposes in the system. By making this component multi-functional, the patent reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving view angle correction during AF operation.
Data Source
AI summary
The present invention provides a lens controller which electrically controls a focus and a zoom of a taking lens, the lens controller comprising: an AF control device which automatically controls the focus of the taking lens so that a given subject imaged by the taking lens is in focus; and a view angle correction device which keeps an angle of view of the taking lens constant by moving the zoom of the taking lens to prevent a variation of the angle of view associated with a movement of the focus moved by the AF control device; wherein, when the focus is moved by the AF control device, the view angle correction device detects a current position of the focus by a position detecting device, obtains a position of the zoom for preventing the variation of the angle of view based on the detected current position of the focus, and moves the zoom to the obtained position.