Angular Velocity Sensor Lead Frame Segmentation for Vibration Control
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Solution Overview
Problem
Conventional angular velocity sensors face erroneous detection due to high-frequency external oscillations overlapping with detected oscillations, requiring longer lead frames with reduced rigidity to control vibrations, which increases the mount space and structure size.
Innovation Solution
The angular velocity sensor is mounted using lead frames with a first end segment fixed to the package, an extending segment that oscillates in the detected oscillation direction, and a second end segment fixed to the mount member, allowing the extending segment to reduce resonance frequency and control external oscillations without enlarging the mount space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead frames are elongated to control vibration, then the resonance frequency is reduced and external oscillation control is improved, but the mount space and structure size become larger
Solution Approach 1:
The lead frame is divided into multiple segments including a first end segment, an intermediate segment, and a second end segment. The intermediate segment is configured to oscillate in the detected oscillation direction, while the end segments provide structural support. This segmentation allows the lead frame to control vibrations without requiring excessive length, thereby reducing mount space while maintaining vibration control effectiveness.
Solution Approach 2:
The lead frame is designed with dynamic characteristics where the intermediate segment can oscillate in response to external vibrations. By configuring the lead frame to have controlled oscillation capabilities rather than being completely rigid, the system can absorb and dissipate external oscillations, reducing the need for excessive lead frame length and mounting space.
2Reliability
If the rigidity of the lead frames is reduced to control vibration, then the resonance frequency is reduced and external oscillation control is improved, but the structural strength may be compromised
Solution Approach 1:
Different segments of the lead frame have different rigidity characteristics. The end segments maintain higher rigidity for structural support and electrical connection, while the intermediate segment has reduced rigidity to allow oscillation and absorb external vibrations. This local differentiation of quality allows the lead frame to simultaneously achieve vibration control and maintain structural strength.
Solution Approach 2:
The lead frame may incorporate composite material structures or multi-layer constructions that provide both flexibility for vibration absorption and sufficient strength for structural support. The composite structure allows different regions to exhibit different mechanical properties, enabling simultaneous achievement of vibration control and structural integrity.
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
This configuration effectively reduces resonance frequency and controls external oscillations, preventing overlap with detected oscillations while maintaining a compact mount space, ensuring accurate angular velocity detection.
Implementation Method 1
The at least one extending segment of each of the plurality of lead frames is able to oscillate in the first axis direction
Implementation Method 2
it may be needed that the lead frames are longer and that a rigidity of the lead frames is reduced such that a resonance frequency in a spring-mass system, in which the lead frame serves as a spring and the angular velocity sensor serves as a mass, is reduced
Implementation Method 3
the angular velocity sensing element detects an angular velocity based on a detection vibration of the oscillator... due to a Coriolis force when the angular velocity is applied
Data Source
AI summary
An angular velocity mount arrangement includes an angular velocity sensor and a mount member. The angular velocity sensor includes an oscillator, an angular velocity sensing element, a package, and a plurality of lead frames. The angular velocity sensing element senses an angular velocity based on an oscillation of the oscillator in a first axis direction. The mount member is arranged relative to the angular velocity sensor in a second axis direction, which is generally orthogonal to the first axis direction. The angular velocity sensor is mounted to the mount member through the plurality of lead frames. At least one extending segment is a middle segment of each of the plurality of lead frames and extends toward the mount member in the second axis direction. The at least one extending segment of each of the plurality of lead frames is able to oscillate in the first axis direction.