Thermally Isolated Crystal Oscillator Package for Frequency Stability
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Solution Overview
Problem
Existing crystal oscillators face challenges in maintaining the stability of oscillation signals due to heat transfer from external sources, which affects the vibration element's temperature and frequency stability.
Innovation Solution
The oscillator design incorporates a heat insulating member between the inner and outer packages, along with a heat generation element and a conductive wire for electrical coupling, to isolate the vibration element from external heat and maintain a stable temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal wiring or metal-plated through holes are formed in spacers to establish electrical coupling between the package body and base substrate, then electrical coupling is achieved, but heat is easily transferred between the base substrate and package body via the metal portion
Solution Approach 1:
The patent introduces a heat insulating member as an intermediary substance between the base substrate and package body. This heat insulating member contains conductive wires embedded within it, serving as a mediator that simultaneously provides both electrical coupling and thermal insulation. The conductive wires penetrate through the heat insulating member to establish electrical connections, while the heat insulating member itself blocks heat transfer between the base substrate and package body.
2Strength
If the package body is fixed to the base substrate via spacers with metal portions, then structural support is provided, but heat from the outside is easily transferred to the vibration element
Solution Approach 1:
The heat insulating member acts as a thermal barrier intermediary between the base substrate and package body, preventing external heat from reaching the vibration element. The conductive wires embedded in the heat insulating member provide the necessary electrical pathways without compromising the thermal insulation, as the wires are surrounded by and embedded in the heat-blocking material.
3Stability of the object's composition
If the package body is thermally connected to the base substrate, then structural stability is maintained, but heat generated by the heater IC escapes to the outside and the vibration element cannot be efficiently heated
Solution Approach 1:
The heat insulating member serves as a thermal isolation intermediary that prevents heat generated by the heater IC from escaping to the base substrate and external environment. By embedding conductive wires within this thermally insulating structure, the patent maintains electrical connectivity while blocking thermal energy loss, thereby improving heating efficiency for the vibration element.
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 prevents external heat from affecting the vibration element, allowing it to be maintained at a desired temperature, thereby stabilizing the oscillation signal and improving frequency characteristics.
Implementation Method 1
the package body is fixed to the base substrate via a heat insulating member
Implementation Method 2
a conductive wire electrically coupling the outer package and the inner package
Implementation Method 3
a heat generation element accommodated in the accommodation space and fixed to the inner package
Data Source
AI summary
An oscillator includes: an outer package having an accommodation space; an inner package accommodated in the accommodation space and fixed to the outer package via a heat insulating member; a vibration element accommodated in the inner package; a heat generation element accommodated in the accommodation space and fixed to the inner package; an oscillation circuit configured to oscillate the vibration element; a control circuit disposed outside the accommodation space and configured to control the heat generation element; and a conductive wire electrically coupling the outer package and the inner package.