Vibrator Device Reducing Mounting Stress via Intermediary Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method of adjusting the frequency of quartz crystal vibrators is complicated due to varying stress applied during mounting, leading to frequency variations in the vibrator element.
Innovation Solution
A vibrator device configuration with a base, first and second relay substrates, and a vibrator element, where the second relay substrate is positioned between the first relay substrate and the vibrator element, with terminals for frequency measurement, reducing mounting stress and frequency variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency of the vibrator element is adjusted in a state where it is fixed to the substrate for measurement, and then the substrate is fixed to the package, then the frequency can be adjusted before mounting, but the frequency varies due to mounting stress applied during the subsequent mounting process
Solution Approach 1:
The frequency of the vibrator element is adjusted in advance before it is mounted on the package. Specifically, the vibrator element is fixed to a substrate for measurement, its frequency is adjusted to a target value, and then it is transferred to the package. This preliminary frequency adjustment ensures that the frequency is set before any mounting stress is applied, preventing subsequent frequency drift.
Solution Approach 2:
A substrate for measurement is used as an intermediary carrier to hold the vibrator element during the frequency adjustment process. This substrate is separate from the final package, allowing frequency adjustment to occur in a stress-free environment before the vibrator element is permanently mounted to the package where it would experience mounting stress.
2Ease of manufacture
If the vibrator element is directly fixed to the package for mounting, then the mounting process is simple, but the mounting stress causes frequency variation of the vibrator element
Solution Approach 1:
The manufacturing process is divided into distinct stages: (1) fixing the vibrator element to a substrate for measurement, (2) adjusting the frequency to the target value, (3) transferring the vibrator element to the package, and (4) mounting the package. This segmentation allows frequency adjustment to occur in a controlled environment before final mounting, separating the frequency adjustment function from the mounting function to prevent stress-induced frequency variation.
3Reliability
If frequency adjustment is performed after fixing the vibrator element to the package, then the mounting stress is already applied, but the frequency adjustment becomes complicated due to the already-applied stress
Solution Approach 1:
Frequency adjustment is performed as a preliminary action before the vibrator element is mounted to the package. The vibrator element is adjusted to the target frequency while on the substrate for measurement, where no mounting stress is present. This eliminates the need for complex stress-compensated adjustment procedures that would be required if adjustment were performed after mounting.
Data Source
AI summary
A vibrator device includes a base, a first relay substrate mounted on the base, a second relay substrate mounted on the first relay substrate, and a vibrator element mounted on the second relay substrate, in which the second relay substrate is disposed between the first relay substrate and the vibrator, and the second relay substrate includes a terminal that is electrically coupled to the vibrator element and is positioned in a region overlapping with the first relay substrate and not overlapping the vibrator element in a plan view. The vibrator device being configured to reduce a mounting stress applied to a vibrator element and to reduce frequency variation of the vibrator element due to the mounting stress, in a case of mounting on a package after adjusting a frequency of the vibrator element.