Three-axis micro gyroscope with ring spring for size reduction
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Solution Overview
Problem
Existing three-axis micro gyroscopes require multiple sensors, increasing cost and size, making them less convenient for applications like video cameras and navigation systems where miniaturization is essential.
Innovation Solution
A three-axis micro gyroscope design featuring a main spring part with elasticity on an x-y plane, driving parts that contract and expand to cause vibrations in the z-axis direction, and sensing parts to detect these vibrations, allowing for effective measurement of rotational movements across all three axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three separate micro gyroscopes are arranged to measure each rotation of the three axes, then measurement capability for all three axes is achieved, but cost and size increase
Solution Approach 1:
The patent combines three separate micro gyroscope measurement functions into a single integrated device. Multiple mass parts (first mass part, second mass part, third mass part) are coupled to a shared main spring part, allowing simultaneous measurement of rotational movements about all three spatial axes (x, y, z) through a unified structure rather than three separate devices
Solution Approach 2:
The single micro gyroscope device performs multiple measurement functions by detecting rotational movements about three perpendicular axes simultaneously. The main spring part with multiple mass parts enables the device to sense rotations about x-axis, y-axis, and z-axis through complementary driving and sensing mechanisms, making one device universal for three-axis measurement
2Volume of moving object
If miniaturization is implemented for convenience of use, then size is reduced, but measurement accuracy and resonance Q-factor may be compromised
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement of mass parts and spring structures to achieve miniaturization. The main spring part is configured on an x-y plane with mass parts positioned at different heights (z-axis direction), creating a compact three-dimensional structure that maintains measurement accuracy while reducing overall device size
Solution Approach 2:
The patent employs a nested configuration where multiple mass parts are coupled to the main spring part in a compact arrangement. The first, second, and third mass parts are positioned at different locations and orientations, nested within the same structural footprint, allowing multiple measurement functions in a minimized volume
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
Enables accurate and efficient measurement of rotational movements along the x, y, and z axes, reducing size and cost while improving measurement accuracy and resonance Q-factor, thus enhancing the performance of micro gyroscopes in various electronic devices.
Implementation Method 1
a main spring part GRG having elasticity and disposed on an x-y plane in a form of a closed curve including the reference point PREF
Implementation Method 2
a driving part GDR which contracts and expands the main spring part GRG with respect to an x-axis direction and a y-axis direction which are complementary to each other
Implementation Method 3
A gyroscope is a device which senses a rotational movement about a specific axis by sensing a Coriolis force generated when an angular velocity due to an external force acts on a mass body vibrating at a predetermined moving speed
Data Source
AI summary
Disclosed is a three-axis micro gyroscope having a ring spring. The three-axis micro gyroscope of the present invention comprises: a main spring part; a driving part; an x mass part; an y mass part; a z mass part; and a sensing part. The x mass part moves in the y axis direction depending on the contraction and expansion of the main spring part. The y mass part moves in the x axis direction depending on the contraction and expansion of the main spring part. The z mass part comprises an x vibration mass means and an y vibration mass means. The sensing part senses vibration shaking of the x mass part, the y mass part and the z mass part. The three-axis micro gyroscope of the present invention is capable of effective measurement of rotational movements for all three of the x, y and z axes.