OCXO Crystal Resonator Cover Material for Stable Frequency Output
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Solution Overview
Problem
Existing Oven Controlled Xtal Oscillators (OCXO) face frequency variations exceeding theoretical limits due to materials with low heat conductivity used in crystal resonator covers, which hinder accurate temperature stabilization and frequency adjustment.
Innovation Solution
The use of a crystal resonator cover made from phosphorus deoxidized copper, which has high heat conductivity and a high annealing temperature, is employed to maintain temperature control while preventing softening during soldering, thereby reducing frequency signal distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If materials with low heat conductivity (nickel silver or phosphor bronze) are used for the crystal resonator cover, then the material has sufficient annealing resistance, but the temperature stabilization accuracy deteriorates due to poor heat conduction
Solution Approach 1:
The patent changes the material parameter from low heat conductivity materials (nickel silver, phosphor bronze) to high heat conductivity material (phosphorus deoxidized copper). This parameter change resolves the contradiction by improving temperature stabilization accuracy through better heat conduction while maintaining sufficient annealing resistance due to the high annealing temperature characteristic of phosphorus deoxidized copper.
2Temperature
If phosphorus deoxidized copper is used for the crystal resonator cover, then heat conductivity is improved for better temperature control, but the material may soften during soldering due to its annealing temperature
Solution Approach 1:
The patent selects phosphorus deoxidized copper with specific material parameters (heat conductivity of 340 W/m·K and annealing temperature of approximately 300°C) that optimize both heat conduction performance and resistance to softening during the soldering process, resolving the contradiction between these two requirements.
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 approach ensures stable frequency output with reduced frequency variations, achieving high accuracy in temperature control and frequency stabilization by using phosphorus deoxidized copper for the crystal resonator cover, which maintains heat conductivity while avoiding annealing-related distortions.
Implementation Method 1
The crystal resonator cover is constituted of a phosphorus deoxidized copper... phosphorus deoxidized copper that has a high heat conductivity
Implementation Method 2
phosphorus deoxidized copper that has a high heat conductivity and a high annealing temperature... preventing softening during soldering
Data Source
AI summary
To provide an oscillator configured to output a frequency signal accurately reflecting a result of a temperature adjustment by a heater circuit. An oscillator outputs a frequency signal with a frequency preliminarily set. A crystal resonator connected to an oscillator circuit is housed inside a crystal resonator cover. Soldering this crystal resonator cover onto the base plate inside the container disposes the crystal resonator on the base plate inside the container. A heater circuit performs a temperature adjustment inside the container based on a temperature detected by a temperature detector. At this time, the crystal resonator cover that houses the crystal resonator is constituted of a phosphorus deoxidized copper.