Shake Correction Device Frequency Band Signal Splitting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shake correction devices for observation devices, such as binoculars, are unable to effectively correct image shake caused by multiple types of oscillations with different frequency bands, leading to discomfort and motion sickness during prolonged use.
Innovation Solution
A shake correction device that includes a correction optical element between the objective and ocular lenses, an actuator, a displacement sensor, and a correction signal output unit that splits and amplifies displacement signals by frequency bands to generate composite correction signals for the actuator, allowing for precise image stabilization across various oscillation frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an angular velocity sensor is used to detect oscillation in a shake correction device, then high-frequency oscillation due to hand shake can be detected, but low-frequency oscillation due to ship rolling cannot be appropriately corrected
Solution Approach 1:
The patent segments the oscillation detection and correction process into two distinct frequency bands: high-frequency band for hand shake correction and low-frequency band for ship rolling correction. This segmentation allows each band to be processed independently with appropriate correction strategies, resolving the contradiction between detecting high-frequency oscillation and correcting low-frequency oscillation.
Solution Approach 2:
The patent implements dynamic correction by adjusting the correction amount based on the frequency characteristics of the detected oscillation. For high-frequency hand shake, a different correction amount is applied compared to low-frequency ship rolling, allowing the system to adapt its correction strategy to the specific oscillation type being detected.
2Productivity
If the actuator is driven based on the angular velocity signal from the sensor, then high-frequency oscillation can be corrected, but the displacement amount for low-frequency oscillation becomes too small to be effective
Solution Approach 1:
The patent changes the correction parameter (correction amount) based on the frequency band of the detected oscillation. By setting different correction amounts for high-frequency and low-frequency bands, the system achieves both rapid response to hand shake and sufficient displacement correction for ship rolling, resolving the contradiction between correction speed and correction precision.
3Device complexity
If a single correction amount is used for all frequency bands, then the device structure remains simple, but multiple types of oscillation cannot be simultaneously corrected
Solution Approach 1:
The patent implements multi-functionality by enabling the single shake correction device to handle multiple types of oscillation (hand shake and ship rolling) simultaneously. Through frequency band separation and adaptive correction amount setting, the device achieves universal correction capability across different oscillation scenarios without requiring separate correction mechanisms for each type.
Data Source
AI summary
A first correction signal creation unit splits an angular velocity signal of an ultra low-low frequency band from an angular velocity signal of an X-axis angular velocity sensor and outputs a first correction signal amplified based on signal output characteristics of the angular velocity sensor. A second correction signal creation unit splits an angular velocity signal of a low-high frequency band from the angular velocity signal and outputs a second correction signal amplified based on the signal output characteristics of the angular velocity sensor. An addition computation unit creates a composite correction signal in which the first correction signal and the second correction signal are composed, and a drive computation unit creates a drive signal based on the composite correction signal. A driver drives the X-axis actuator based on the drive signal, displaces the correction optical element, and corrects shake of an image.