Optical Apparatus Control for Endlessly Rotatable Ring Positioning
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Solution Overview
Problem
Existing optical apparatuses with endlessly rotatable electronic rings face errors in driving optical elements due to electrical control interventions, making precise positioning of optical elements, such as focus lenses, difficult and inaccurate.
Innovation Solution
A control apparatus and method that sets reference positions for both the operation ring and optical element, calculating and controlling the drive amount based on operational amounts from these references to improve driving accuracy, preventing errors and maintaining correspondence between ring and focus positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an endlessly rotatable electronic ring is used for manual operation, then the ease of operation is improved, but the driving precision of the optical element deteriorates due to electrical control interventions
Solution Approach 1:
The system performs preliminary actions by detecting the start of ring operation and establishing reference positions for both the ring and optical element before actual driving occurs. This preliminary setup ensures that subsequent driving operations are accurately referenced, preventing accumulation of positional errors during endless rotation
Solution Approach 2:
The system implements feedback by continuously monitoring the rotational position of the operation ring and the actual position of the optical element, then using this information to calculate and adjust the drive amount. This closed-loop feedback mechanism compensates for electrical control interventions and maintains driving precision
2Measurement precision
If the rotational position of the electronic ring is associated with the object distance for focusing, then the focusing accuracy is improved, but the device becomes inapplicable when the ring is endlessly rotatable without position limitation
Solution Approach 1:
The system dynamically adapts by detecting when the operation ring is being manipulated and establishing reference positions at that moment. This dynamic approach allows the system to work with endlessly rotatable rings without requiring fixed rotational limits, making the focusing mechanism both accurate and universally applicable
3Device complexity
If the operational amount of the operation ring is used to calculate the drive amount of the optical element, then the driving control is simplified, but errors accumulate when the ring is rotated multiple times
Solution Approach 1:
By establishing reference positions for both the operation ring and optical element at the start of operation, the system creates a fresh reference point that prevents accumulation of rotational errors, allowing simplified control without sacrificing reliability
Solution Approach 2:
The system uses feedback to continuously compare the operational amount of the ring with the actual position of the optical element, calculating the drive amount based on this comparison rather than simple integration. This feedback mechanism prevents error accumulation while maintaining control simplicity
Data Source
AI summary
A control apparatus is used for an optical apparatus that includes a movable optical element, an operation ring that is endlessly rotatable, and a driver configured to drive the optical element. The control apparatus includes an operation start detector configured to detect a start of an operation of the operation ring, and a drive controller configured to control the driver. The drive controller sets a rotational position of the operation ring and the position of the optical element to a ring reference position and an optical element reference position respectively when the start of the operation of the operation ring is detected. The drive controller controls the driver in accordance with a drive amount of the optical element calculated with an operational amount of the operation ring from the ring reference position, and the optical element reference position.