Vibration Element Pedestal Structure for Phase Noise Stability
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Solution Overview
Problem
Conventional crystal pedestals for vibration elements, resonators, and oscillators are susceptible to external vibrations, which deteriorate the phase noise characteristic.
Innovation Solution
A pedestal design featuring connection portions, clearance portions, a mounting portion, and arm portions, where the arm portions absorb external vibrations, preventing their transmission to the mounting portion, and a metal pattern connects the arm, mounting, and connection portions to enhance vibration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional crystal pedestal is used to mount a vibration element, then the structure is simple and easy to manufacture, but external vibrations are transmitted to the vibration element which deteriorates the phase noise characteristic
Solution Approach 1:
The arm portions are designed with thin film structures that have flexibility to absorb external vibrations through elastic deformation, preventing rigid transmission of vibrations to the vibration element while maintaining structural connectivity
Solution Approach 2:
The arm portions are designed in advance to function as vibration-absorbing elements that cushion external vibrations before they reach the vibration element, protecting it from harmful vibrational effects
2Strength
If the connection portions are made thick to improve structural strength, then the strength increases, but the vibration resistance against external vibrations deteriorates
Solution Approach 1:
Different portions of the pedestal have different thicknesses optimized for their specific functions: connection portions are thick for strength and stability, while arm portions are thin for vibration absorption, creating local quality variations that resolve the contradiction
Solution Approach 2:
The pedestal is segmented into distinct portions (connection portions, arm portions, mounting portion) with different structural characteristics, allowing each segment to be optimized independently for its specific function
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 design ensures excellent phase noise characteristics and improved impact resistance by effectively absorbing external vibrations, reducing stress on the vibration element.
Implementation Method 1
the arm portions absorb external vibrations, preventing their transmission to the mounting portion
Implementation Method 2
the arm portions absorb external vibrations
Implementation Method 3
A metal pattern connected to an electrode formed on the vibration element is formed to connect the mounting portion, the arm portions, and the connection portions
Data Source
AI summary
A pedestal for a vibration element includes a main body that includes two connection portions, two clearance portions, a mounting portion, and arm portions. The two connection portions are formed along long sides of the main body and contact the base plate. The two clearance portions are formed on insides of the main body with respect to the connection portions and formed along the long sides. The mounting portion is located between the two clearance portions. The vibration element is mounted to the mounting portion. The arm portions are formed on four corners of the main body and connect the mounting portion to the connection portions. A metal pattern is connected to an electrode formed on the vibration element. The metal pattern is formed to connect the mounting portion, the arm portions, and the connection portions.