Mirror Tilt Actuator for Vibration Counteraction in Imaging Devices
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Solution Overview
Problem
Existing imaging devices mounted on aircraft face challenges with narrow mirror movement range and slow response speed, particularly in absorbing high-frequency vibrations and posture changes, due to limitations in drive mechanisms using piezoelectric elements and motors.
Innovation Solution
An imaging device with a mirror tilt actuator that includes a base, mirror holder, elastic members, and driving means using coils and magnetic circuits, allowing the mirror to be tilted electromagnetically for wide-range and fast movement, effectively counteracting vibrations and posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a piezoelectric element is used to drive the mirror, then the response speed is increased, but the range of movement of the mirror becomes narrow
Solution Approach 1:
The drive mechanism is segmented into two independent parts: a motor for large-range positioning and a piezoelectric element for fine adjustments. This segmentation allows each component to operate within its optimal range, combining the fast response of piezoelectric elements with the large movement capability of motors.
Solution Approach 2:
The patent merges two different drive mechanisms (motor and piezoelectric element) into a single integrated system. The motor handles coarse positioning while the piezoelectric element provides fine-tuning, achieving both wide range and fast response simultaneously.
2Length of moving object
If a motor is used to drive the mirror, then the range of movement is increased, but the response speed becomes slow
Solution Approach 1:
The drive mechanism is segmented into two independent parts: a motor for large-range positioning and a piezoelectric element for fine adjustments. This segmentation allows each component to operate within its optimal range, combining the fast response of piezoelectric elements with the large movement capability of motors.
Solution Approach 2:
The patent merges two different drive mechanisms (motor and piezoelectric element) into a single integrated system. The motor handles coarse positioning while the piezoelectric element provides fine-tuning, achieving both wide range and fast response simultaneously.
3Device complexity
If only mirror movement is used to counteract vibration, then the system remains simple, but high-frequency vibration cannot be absorbed
Solution Approach 1:
The patent implements a dynamic drive mechanism that can operate at high frequencies through the piezoelectric element. The piezoelectric element's ability to respond rapidly to control signals enables effective counteraction of high-frequency vibrations while maintaining relatively simple system architecture.
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 imaging device achieves wide-range driving and fast response speed, effectively absorbing high-frequency vibrations and maintaining image stability, outperforming traditional biaxial piezo and cymbal imaging devices.
Implementation Method 1
driving means that tilts the mirror holder with respect to the base to change the optical axis of the lens, which is an optical axis to be incident on a central part of the imaging element in the subject light exited from the lens, in which the mirror tilt actuator has: a base; a mirror holder that holds the mirror; an elastic member that supports the mirror holder on the base such that the mirror holder can move with respect to the base; and driving means that tilts the mirror holder in a direction perpendicular to a direction of magnetic moment of the permanent magnet using electromagnetic force acting between the coil and the magnetic circuit
Data Source
AI summary
It is an object of the present invention to drive a mirror in a wide driving range and at a fast response speed. An imaging device 100 includes an imaging element 103, a mirror 102, a lens 101, and a mirror tilt actuator 110. The imaging element 103 images subject light that is reflected light from a subject. The mirror 102 reflects the subject light, and makes the subject light incident on the imaging element 103. The lens 101 collects the subject light on the mirror 102. The mirror tilt actuator 110 drives the mirror 102 so as to change an optical axis of the lens OAL. The optical axis of the lens OAL is an optical axis to be incident on the central part C of the imaging element 103 in the subject light exited from the lens 101.