Oscillator Electrode Layout for Frequency Stability Under Heat Loss
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Solution Overview
Problem
The oscillation frequency stability of existing oscillators is reduced due to insufficient heat transfer from the heat generation circuit to the circuit element, as the temperature control element and circuit element are formed separately, leading to radiant heat release.
Innovation Solution
The oscillator design includes a resonator element with excitation electrodes that cover the temperature sensor and heat generation circuit, enhancing heat retention and temperature control, with the resonator element housed in an inner package thermally insulated from the outer package, and both packages being made of materials with similar linear expansion coefficients to minimize thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature control element and circuit element are formed separately in the container, then the device complexity is reduced and ease of manufacture is improved, but the heat transfer efficiency deteriorates and frequency stability is reduced
Solution Approach 1:
The temperature control element and circuit element are integrated into a single component structure where the circuit element is formed within the temperature control element. This merging allows heat generated by the heat generation circuit to be directly transferred to the circuit element through thermal conduction, eliminating the radiant heat loss problem that occurs when components are formed separately. The integrated structure maintains manufacturing simplicity while significantly improving heat transfer efficiency and frequency stability.
2Device complexity
If the temperature control element and circuit element are formed separately, then the device structure is simplified, but the heat retention efficiency deteriorates and temperature stability is reduced
Solution Approach 1:
The temperature control element is designed as an integrated structure containing both the heat generation circuit and the circuit element. This merging ensures that heat generated by the heat generation circuit is efficiently retained and transferred to the circuit element through direct thermal contact, preventing heat loss to the surrounding environment. The integrated design maintains structural simplicity while achieving superior temperature stability.
3Length of stationary object
If heat is released as radiant heat from the heat generation circuit, then the heat transfer distance is increased, but the heat transfer efficiency deteriorates and frequency stability is reduced
Solution Approach 1:
The circuit element acts as an intermediary between the heat generation circuit and the resonator element. Heat is transferred from the heat generation circuit to the circuit element through thermal conduction, and then from the circuit element to the resonator element. This intermediary structure eliminates the need for radiant heat transfer, reducing heat loss and improving heat transfer efficiency while maintaining appropriate heat transfer distances.
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 achieves high temperature stability and excellent frequency stability by uniformly maintaining temperature within the oscillator, reducing radiant heat release, and minimizing thermal stress, thereby improving frequency characteristics and reducing electric current consumption.
Implementation Method 1
heat from the heat generation circuit is released as radiant heat
Implementation Method 2
heat from the heat generation circuit is released as radiant heat, so that the heat may be insufficiently transferred to the circuit element
Implementation Method 3
a resonator element provided with an excitation electrode, an oscillation circuit for oscillating the resonator element to generate an oscillation signal
Implementation Method 4
a temperature sensor for generating a temperature signal for temperature compensation of the oscillation signal
Implementation Method 5
a temperature control element for controlling temperature of the resonator element, and a container that houses the resonator element, the oscillation circuit, the temperature sensor, and the temperature control element
Data Source
AI summary
An oscillator includes a resonator element provided with an excitation electrode, an oscillation circuit for oscillating the resonator element to generate an oscillation signal, a temperature sensor for generating a temperature signal for temperature compensation of the oscillation signal, a temperature control element for controlling temperature of the resonator element, and a container that houses the resonator element, the oscillation circuit, the temperature sensor, and the temperature control element, in which the temperature sensor and the temperature control element overlap the excitation electrode in plan view.