Gyro Sensor Damping for Vibration Detection
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Solution Overview
Problem
Existing image pickup apparatuses with gyro sensors face challenges in accurately detecting camera shake due to variations in resonant frequencies of damping members across detection axes, leading to inaccurate image stabilization, especially when high-frequency vibrations like shutter shock are encountered.
Innovation Solution
A vibration detecting apparatus is designed with a gyro sensor holder sandwiched between first and second damping members, where the damping members abut the holder's surfaces with reduced areas, ensuring substantially uniform resonant frequencies across detection axes, thereby preventing high-frequency vibrations from reaching the gyro sensors and improving image stabilization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the resonant frequency of the damping members is lowered to the camera shake frequency range (1 Hz to 10 Hz) to improve damping effect, then the high-frequency vibration suppression is improved, but the responsivity of the gyro sensors becomes worse due to phase delay
Solution Approach 1:
The patent changes the physical parameters of the damping members, specifically their shape and material properties, to achieve a resonant frequency that is optimally positioned above the camera shake frequency range (1-10 Hz) but below the detuning frequency. This parameter optimization allows the damping members to effectively suppress high-frequency vibrations including shutter shock while maintaining gyro sensor responsivity and minimizing phase delay in the camera shake detection range.
2Measurement precision
If the resonant frequency is set above the detuning frequency to avoid phase delay, then the gyro sensor responsivity is improved, but high-frequency vibrations equal to or higher than the detuning frequency cannot be suppressed
Solution Approach 1:
The patent optimizes the resonant frequency parameter of the damping members to fall within a specific frequency window: above the camera shake frequency range (1-10 Hz) to maintain gyro sensor responsivity and minimize phase delay, but below the detuning frequency to effectively suppress high-frequency vibrations including shutter shock. This precise parameter positioning resolves the contradiction between responsivity and vibration suppression.
3Measurement precision
If damping members are designed with uniform resonant frequencies in all detection axes, then measurement accuracy is improved, but manufacturing complexity increases due to asymmetrical shape constraints
Solution Approach 1:
The patent employs asymmetrical damping member designs to achieve uniform resonant frequencies across all detection axes. By carefully designing the asymmetrical shape and material distribution of the damping members, the patent compensates for variations in the sensor holder's geometry and achieves consistent resonant frequency characteristics in all three detection axes, thereby improving camera shake detection accuracy while accounting for manufacturing constraints.
4Stability of the object's composition
If the damping member contact area with the sensor holder is increased to improve stability, then the structural stability is improved, but the resonant frequency varies across detection axes
Solution Approach 1:
The patent applies local quality by designing damping members with non-uniform contact areas with the sensor holder. Instead of increasing the contact area uniformly across all axes, the patent strategically designs the contact area distribution to compensate for asymmetrical variations in the sensor holder geometry. This localized optimization of contact area ensures uniform resonant frequencies across all detection axes while maintaining adequate structural stability.
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 allows for accurate detection of camera shake by maintaining resonant frequencies above the camera shake frequency range and below the detuning frequency, enhancing image stabilization by reducing phase delays and output errors, thus producing clearer images.
Implementation Method 1
a first damping member configured to abut against a first surface of the sensor holder, and a second damping member configured to abut against a second surface of the sensor holder
Implementation Method 2
the resonant frequency of the damping members is required to be equal to or higher than the camera shake frequency range and lower than the detuning frequency
Data Source
AI summary
A vibration detecting apparatus capable of accurately detecting camera shake by making resonant frequencies in damping members in directions of detection axes of gyro sensors substantially uniform. The gyro sensors which detect shake are held on a sensor holder. The first damping member abuts against at least a part of an outer periphery of a first surface of the sensor holder, wherein the area of a region of the first damping member which abuts against the first surface is smaller than the area of the first surface. The second damping member abuts against at least a part of an outer periphery of a second surface of the sensor holder which is, in a predetermined direction, opposite to the first surface, wherein the area of a region of the second damping member which abuts against the second surface is smaller than the area of the second surface.