Optical Apparatus Step-Out Detection via Signal Memory
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Solution Overview
Problem
Interchangeable lenses face challenges in detecting step-out states of stepping motors during low power consumption modes, leading to delayed detection and potential misalignment issues when switching back to normal power state.
Innovation Solution
An optical apparatus with a driver, a first detector to monitor the driving amount or position, a memory to store signal values during power state changes, and a determiner to identify abnormal states by comparing stored and current signal values, enabling detection of step-out conditions even in low power consumption states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the optical apparatus switches to a low power consumption state by cutting off power supply to the rotation detector and reference position detector, then power consumption is reduced, but the ability to detect step-out states is lost
Solution Approach 1:
The patent stores the signal value from the first detector in a memory before switching to the low power consumption state. This preliminary action preserves the detection data even when power is cut off, enabling step-out detection capability to be maintained without continuous power supply to the detector.
Solution Approach 2:
The patent creates a copy of the detector signal value and stores it in memory. This copied data serves as a reference that can be compared with future detector readings to determine if a step-out occurred during the low power consumption state, replacing the need for continuous detector operation.
2Measurement precision
If the reference position detection operation is performed again when switching from low power consumption state to normal power state to ensure accurate positioning, then positioning accuracy is maintained, but the user needs to wait for a long time
Solution Approach 1:
The patent uses feedback by comparing the stored signal value from memory with the current signal value from the first detector after power state transition. This feedback mechanism allows the system to determine whether the driven member has moved from its original position, enabling accurate position verification without requiring a full reference position detection operation.
Solution Approach 2:
Instead of performing a complete reference position detection operation, the patent performs a partial check by comparing stored and current detector values. This partial action is sufficient to detect step-out states and maintain positioning accuracy without the time penalty of a full detection sequence.
3Reliability
If the stepping motor is assumed to be in step-out state during low power consumption state and reference position detection is performed again upon switching to normal power state, then step-out detection is achieved, but productivity decreases due to extended wait time
Solution Approach 1:
The patent performs preliminary action by storing the detector signal value in memory before entering low power consumption state. This allows the system to quickly compare stored and current values upon waking, enabling rapid step-out detection without requiring time-consuming reference position detection operations.
Solution Approach 2:
The patent uses partial action by performing only a value comparison rather than a complete reference position detection. This partial check is sufficient to detect step-out states while significantly reducing the time required, thereby maintaining productivity.
Data Source
AI summary
An optical apparatus attachable to an image pickup apparatus and switchable a power state between a first state and a second state that consumes a power less than the first state includes a driver that drives a driven member, a first detector configured to detect a driving amount of the driver or whether the driven member is located at a predetermined position, a memory that stores a signal value of the first detector when the power state of the optical apparatus is switched from the first state to the second state, and a determiner that determines that the driver is in an abnormal state when the signal value stored in the memory and the signal value of the first detector when the power state of the optical apparatus is switched from the second state to the first state are different from each other.