Crystal Oscillator Thermal Management via Segmented Mounting
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Solution Overview
Problem
In crystal oscillation devices, temperature changes in the surrounding area of the IC chip occur before the crystal unit, leading to frequency shifts due to inadequate heat management, causing temperature-related frequency instability.
Innovation Solution
A crystal oscillation device design featuring a mounting board with conductive joining materials that partially surround a temperature-sensitive element, creating a heat passage between the mounting board and the package material to inhibit temperature increases in the temperature-sensitive element, thereby reducing temperature differences between the IC chip and the crystal unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mounting board is joined to the package material without gaps, then structural strength is improved, but heat dissipation deteriorates causing temperature increase of the temperature-sensitive element
Solution Approach 1:
The joining structure is segmented into multiple discrete conductive joining materials positioned at specific locations rather than continuous contact. This segmentation creates gaps between the mounting board and package material that allow heat to dissipate while maintaining structural integrity through the distributed joining points.
Solution Approach 2:
Different regions of the mounting board have different properties: areas with conductive joining materials provide structural support and electrical connection, while gap regions provide thermal relief. This local differentiation allows simultaneous achievement of strength and heat dissipation.
2Strength
If the temperature-sensitive element is surrounded by the mounting board, then mechanical support is improved, but heat accumulation worsens due to restricted heat passage
Solution Approach 1:
The surrounding structure is segmented by introducing gaps at specific positions, allowing the mounting board to provide mechanical support while permitting heat to escape through the openings rather than being trapped by complete enclosure.
Solution Approach 2:
The gaps act as intermediary spaces that mediate between the need for mechanical support (mounting board surrounding the element) and heat dissipation (heat passage). These gaps allow thermal energy to pass through while the mounting board maintains its supportive function.
3Reliability
If conductive joining materials are used to join the mounting board, then electrical connection is improved, but heat conduction to the temperature-sensitive element worsens
Solution Approach 1:
The conductive joining materials are placed locally at specific positions where electrical connection is needed, rather than providing continuous contact. This localized approach ensures reliable electrical connection at the joining points while preventing excessive heat conduction to the temperature-sensitive element through the gaps between joining materials.
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 design effectively reduces temperature increases in the temperature-sensitive element, maintaining stable frequency characteristics by ensuring a heat passage and minimizing temperature differences between the IC chip and the crystal unit, thus preventing frequency shifts.
Implementation Method 1
a heat passage between the mounting board and the package material to inhibit temperature increases
Data Source
AI summary
A crystal oscillation device in which crystal unit is mounted on a package board as a package material and the package board is joined to a mounting board by conductive joining materials. Moreover, a gap is provided between the package board and the mounting board other than portions joined by the conductive joining material and the conductive joining material.