Lens Step-Out Detection via Shock Vector Accumulation
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Solution Overview
Problem
Existing image pickup apparatuses face accuracy issues in determining lens position deviations due to vibrations, leading to incorrect reset operations and adverse effects on image quality.
Innovation Solution
An image pickup apparatus and method that uses an acceleration sensor to detect shocks and accumulates their vector components, determining a step-out by exceeding a predetermined threshold value, allowing for precise lens position reset operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a threshold value for shock detection is set small, then the sensitivity of detecting lens position deviation is improved, but false reset operations occur frequently when no step-out has actually happened
Solution Approach 1:
The system performs preliminary shock detection and cumulative value calculation before determining whether a reset operation is needed. By accumulating shock detection values over time and comparing against a threshold, the system prepares in advance to distinguish between normal vibrations and actual step-out events, preventing false resets while maintaining sensitivity.
Solution Approach 2:
The system continuously monitors shock detection values and feeds back the cumulative sum to the determination logic. This feedback mechanism allows the system to adaptively assess whether accumulated vibrations indicate a real step-out condition, improving both detection accuracy and operational reliability by basing reset decisions on historical vibration patterns rather than isolated events.
2Reliability
If a threshold value for shock detection is set great, then false reset operations are reduced, but the system fails to detect actual step-out events
Solution Approach 1:
The system accumulates shock detection values over a period before making a determination, preparing in advance to capture gradual or repeated vibrations that indicate step-out. This preliminary accumulation ensures that even small or intermittent deviations are detected when they persist, preventing false negatives while maintaining operational reliability.
Solution Approach 2:
The continuous feedback of cumulative shock values allows the system to recognize patterns of vibration characteristic of step-out events. By monitoring the trend of accumulated values against the threshold, the system can reliably detect actual deviations even with a higher threshold setting, as the cumulative effect of repeated small shocks will eventually trigger accurate detection.
3Speed
If the system performs reset operations based on individual shock detection events, then the response speed to vibrations is improved, but the accuracy of determining actual step-out is reduced
Solution Approach 1:
The system performs preliminary accumulation of shock detection values at high speed before making the final determination. This allows the system to rapidly capture vibration events and their cumulative effect, maintaining fast response capability while ensuring that the determination is based on aggregated evidence rather than isolated events, thereby improving accuracy without sacrificing speed.
Solution Approach 2:
The system provides continuous feedback on the cumulative shock value, enabling rapid assessment of whether vibration patterns indicate step-out. This feedback loop maintains fast response by continuously updating the determination based on accumulating evidence, allowing the system to quickly respond to actual step-out events while filtering out transient vibrations through the cumulative assessment mechanism.
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
This approach enhances the accuracy of determining lens position deviations and ensures accurate reset operations, minimizing malfunctions and ensuring optimal image capture.
Implementation Method 1
acceleration detection means that detects a shock applied to a body of the apparatus and outputs a vector of the shock
Data Source
AI summary
Provided is an image pickup apparatus that can determine a step-out with a high approximation accuracy and then return a lens position to an initial position. The image pickup apparatus includes: an optical element that is movable with respect to a predetermined initial position; acceleration detection means that detects a shock applied to a body of the apparatus and outputs a vector of the shock; and control means that adds up an optical axis direction component of the optical element in the vector of the shock each time the shock is detected and, when a cumulative shock that is a result of adding up exceeds a predetermined threshold, determines that the optical element has stepped out and returns the optical element to the initial position.