Piezoelectric Oscillator Wiring Layout for Thermal Gradient Control
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Solution Overview
Problem
Surface-mounted temperature-compensated piezoelectric oscillators experience frequency drift due to uneven thermal gradients between the integrated circuit element and the piezoelectric vibrator, caused by rapid heat conduction through terminals with high thermal conductivity, leading to inaccurate temperature compensation and frequency variations.
Innovation Solution
A piezoelectric vibration device with a multilayered structure featuring a piezoelectric vibration plate and sealing members, where the wiring patterns for external connection have constricted portions to control heat conduction, ensuring a moderate temperature gradient and rapid thermal equilibrium between the integrated circuit element and the piezoelectric vibrator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals for external connection are made with high thermal conductivity material to ensure good electrical connection, then electrical connection quality is improved, but temperature gradient between integrated circuit element and piezoelectric vibrator increases causing frequency drift
Solution Approach 1:
The wiring pattern is divided into two distinct segments: a first wiring pattern with high thermal conductivity for electrical connection between the integrated circuit element and external terminals, and a second wiring pattern with low thermal conductivity for connecting the piezoelectric vibrator. This segmentation allows each wiring pattern to independently perform its specific function without thermal interference between them.
Solution Approach 2:
Different regions of the device are assigned different thermal conductivity properties according to their specific functional requirements. The first wiring pattern region has high thermal conductivity to efficiently conduct heat away from the integrated circuit element, while the second wiring pattern region has low thermal conductivity to maintain thermal isolation for the piezoelectric vibrator, ensuring each component operates in its optimal thermal environment.
2Device complexity
If integrated circuit element is directly connected to external terminals via internal wiring, then electrical connection is simplified, but temperature compensation accuracy deteriorates due to rapid heat conduction
Solution Approach 1:
The internal wiring structure is segmented into functionally distinct pathways: one pathway (first wiring pattern) handles electrical connection and thermal management for the integrated circuit element, while another pathway (second wiring pattern) provides thermal isolation for the piezoelectric vibrator. This segmentation maintains electrical connection simplicity while enabling precise temperature compensation by preventing unwanted thermal coupling.
Solution Approach 2:
The second wiring pattern acts as a thermal intermediary or barrier between the integrated circuit element and the piezoelectric vibrator. Although both components are electrically connected through the device structure, this intermediary wiring pattern with low thermal conductivity prevents direct thermal conduction, allowing the piezoelectric vibrator to maintain its own temperature characteristics for accurate frequency operation.
3Adaptability or versatility
If electronic components on external circuit board are turned on and off frequently, then device functionality is enhanced, but frequency drift increases due to repeated thermal equilibrium disruptions
Solution Approach 1:
The thermal management structure is segmented into independent zones: the integrated circuit element has its own thermal pathway through the first wiring pattern, while the piezoelectric vibrator has thermal isolation through the second wiring pattern. This segmentation allows the integrated circuit element to experience temperature changes during operational cycles while the piezoelectric vibrator maintains thermal stability, enabling frequent on/off operations without frequency drift.
Solution Approach 2:
The thermal management function is extracted and separated from the electrical connection function. The first wiring pattern handles electrical connection while the second wiring pattern specifically manages thermal isolation. This extraction allows the piezoelectric vibrator to be thermally decoupled from external thermal influences that occur during frequent operational changes, maintaining frequency stability despite operational flexibility.
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 constricted wiring patterns effectively manage heat conduction, minimizing temperature differences and reducing frequency drift by maintaining a stable thermal equilibrium between the integrated circuit element and the piezoelectric vibrator, even during power on/off cycles.
Implementation Method 1
heat conduction through terminals with high thermal conductivity
Implementation Method 2
uneven thermal gradients between the integrated circuit element and the piezoelectric vibrator
Implementation Method 3
piezoelectric vibration device for use in variously different electronic instruments
Data Source
AI summary
Among a plurality of electrodes for mounting purpose, all of the electrodes for mounting purpose but two paired ones of the electrodes for mounting purpose that are connected to driving electrodes each have a wiring pattern for use in electrical connection between terminals for external connection and mounting terminals of IC. These wiring patterns each have a constricted portion smaller in width than the other portions that prevents the conduction of heat.