Image Pickup Apparatus Shake Correction Frequency Interference

Solution Overview

Problem

Image pickup apparatuses face difficulties in accurately executing image shake correction due to interference between the shake detection sensor's driving frequency and vibrations from attached accessories, leading to potential miscorrection or overcorrection.

Innovation Solution

An image pickup apparatus that includes a detector for shake detection, a processor to acquire driving frequency information of attached accessories, and a control unit to manage image shake correction functions based on this information, adjusting control modes to avoid interference and ensure accurate correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the shake detection sensor operates at high sensitivity to detect camera shake, then the image shake correction precision is improved, but the sensor becomes susceptible to interference from vibration sources including attached accessories, causing measurement errors

Engineering Contradiction:

Improveshake detection precisionVSAvoidvibration interference from accessories

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The control unit acquires driving frequency information of attached accessories before executing image shake correction. By obtaining this information in advance, the system can identify potential frequency conflicts between the shake detection sensor and accessory vibrations, allowing preventive measures to be taken before interference occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the driving frequency of attached accessories and uses this feedback to adjust the shake correction control. When a frequency conflict is detected, the control unit modifies the correction algorithm or parameters to avoid the interfering frequency, ensuring accurate shake detection despite the presence of accessories

Inventive Principle:

Principle #23Feedback

2Reliability

If the image pickup apparatus executes shake correction functions based on shake detection output, then image stabilization is achieved, but inappropriate execution or miscorrection occurs when frequency interference from attached accessories is present

Engineering Contradiction:

Improveshake correction reliabilityVSAvoidshake detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The control unit acquires driving frequency information of attached accessories before executing image shake correction. By obtaining this information in advance, the system can identify potential frequency conflicts between the shake detection sensor and accessory vibrations, allowing preventive measures to be taken before interference occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors the driving frequency of attached accessories and uses this feedback to adjust the shake correction control. When a frequency conflict is detected, the control unit modifies the correction algorithm or parameters to avoid the interfering frequency, ensuring accurate shake detection despite the presence of accessories

Inventive Principle:

Principle #23Feedback

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

The solution effectively prevents inappropriate execution of image shake correction functions by identifying and managing frequency interference, thereby reducing the risk of miscorrection and overcorrection, ensuring accurate image stabilization.

Implementation Method 1

a shake detection sensor such as an angular velocity sensor is used for detection of the amount of the camera shake

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a shake detection sensor such as an angular velocity sensor is used for detection of the amount of the camera shake

Methodology Applied

Scientific EffectCapacitive sensing:

Implementation Method 3

when an image pickup apparatus changes a reading frequency of an image pickup part and a driving frequency of the drive part, the driving frequency of the shake detection sensor is changed to cause the sensor to avoid receiving the interference with the vibration

Methodology Applied

Scientific EffectResonance avoidance: Resonance

Data Source

PatentUS10845613B2Image pickup apparatus executing function based on shake, control method for same, and storage medium storing control program therefor

Publication Date: 2020.11.24 CANON KK

AI summary

An image pickup apparatus includes a detector configured to detect a shake of the image pickup apparatus, at least one processor and at least one memory functioning as an acquisition unit configured to acquire driving frequency information on an accessory attached to the image pickup apparatus, and a control unit configured to control a function using a detection result of the detection unit. The control unit controls the function based on the driving frequency information acquired by the acquisition unit.