Interchangeable Lens Gyro Offset Calibration Control
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Solution Overview
Problem
In interchangeable lens systems, energy-saving measures that put the lens into a sleep state can prevent time-consuming calibration processing of gyro sensor offset, leading to inaccurate image stabilization due to incomplete power supply from the camera battery.
Innovation Solution
A control apparatus that determines if the lens is in a static state based on angular velocity signals, prohibiting the camera from sending a sleep state command when offset calibration is needed, ensuring power is maintained for calibration processing without excessive battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens is kept in the active state to receive calibration processing, then the offset calibration accuracy is improved, but the battery consumption increases and the number of image captures reduces
Solution Approach 1:
The system performs offset calibration processing in advance when the lens is in a static state and power is available, storing the calibrated offset value in memory. This preliminary calibration ensures accurate image stabilization is ready when needed, eliminating the need to keep the lens continuously powered for calibration purposes.
Solution Approach 2:
The lens unit autonomously performs self-calibration of the gyro sensor offset when detected in a static state, without requiring continuous camera power supply. The lens uses its own processor and memory to complete the calibration and store results, making the system self-sufficient for maintenance tasks.
2Use of energy by moving object
If the lens is transferred to the sleep state for energy saving, then the battery consumption is reduced, but the offset calibration processing cannot be completed leading to inaccurate image stabilization
Solution Approach 1:
The system proactively performs offset calibration when the lens is in a static state with power available, preparing the accurate offset value in advance. This ensures that when the lens transitions to sleep mode for energy saving, the calibration data is already stored and ready, maintaining image stabilization reliability without requiring continuous power.
Solution Approach 2:
The camera body monitors the calibration status of the lens and provides feedback to determine when to send the sleep command. If calibration is incomplete or not yet performed, the camera delays the sleep transition, ensuring the lens has time to complete calibration before entering low-power mode.
3Loss of energy
If the camera sends the sleep state command immediately after detecting static state, then the energy saving is maximized, but the calibration processing is interrupted
Solution Approach 1:
The camera body receives calibration status feedback from the lens and uses this information to control timing of the sleep command. When calibration is in progress or not yet complete, the camera withholds the sleep command, allowing calibration to finish. This feedback mechanism ensures calibration precision is maintained while still achieving energy saving by transitioning to sleep mode as soon as calibration is complete.
Solution Approach 2:
The system dynamically adjusts the timing of the sleep command based on the calibration status. Rather than using a fixed timing, the camera adapts the sleep transition timing to coincide with completion of calibration processing, optimizing both energy saving and calibration precision according to real-time system state.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate offset calibration of gyro sensors while conserving energy, ensuring reliable image stabilization without reducing the number of image captures.
Implementation Method 1
a gyro sensor is generally used to detect vibrations in an image stabilization system mounted on an optical apparatus, such as a camera
Data Source
AI summary
A control apparatus includes a controller configured to determine whether or not an interchangeable lens is in a static image based on an angular velocity signal output from an angular velocity detector configured to detect an angular velocity of a vibration of an interchangeable lens. The control apparatus receives, from the camera body, a command that transfers the interchangeable lens to a sleep state a predetermined time after the controller determines that the interchangeable lens is in the static state. The controller prohibits the camera body from transmitting the command that transfers the interchangeable lens to the sleep state, when the controller determines that a first offset in the angular velocity signal recorded in a recorder is to be updated.