Quartz Oscillator Layout for Precise Temperature Compensation
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Solution Overview
Problem
Existing vibration devices with separate temperature detection and oscillation sections on quartz substrates face challenges in precise temperature compensation due to heat transfer discrepancies and low resolution of temperature changes with respect to frequency changes.
Innovation Solution
A vibration device configuration with three sections on a common quartz substrate, where the first section is optimized for oscillation signal output with a specific cutting angle, and the second and third sections are optimized for temperature detection with inclined cutting angles, allowing for differential frequency-temperature characteristics for improved temperature detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first vibration section is cut at a cutting angle optimized for small frequency change with respect to temperature change, then the oscillation signal stability is improved, but the second vibration section for temperature detection also has the same frequency-temperature characteristic resulting in low resolution of temperature change detection
Solution Approach 1:
The patent applies local quality by giving different cutting angles to different vibration sections on the same quartz substrate. The first vibration section uses a cutting angle optimized for frequency stability (small frequency change with temperature), while the second and third vibration sections use different cutting angles optimized for temperature detection resolution (large frequency change with temperature). This allows each section to have locally optimized properties for its specific function.
Solution Approach 2:
The patent segments the quartz substrate into multiple vibration sections (first, second, and third vibration sections), each with different cutting angles. This segmentation allows independent optimization of frequency-temperature characteristics for each section, enabling the oscillation section to prioritize stability while detection sections prioritize sensitivity.
2Device complexity
If separate temperature detection device and vibration device are configured separately, then device complexity is reduced, but detection error between detected temperature and actual vibration device temperature increases
Solution Approach 1:
The patent merges the temperature detection function with the vibration device by forming multiple vibration sections directly on the quartz substrate. The second and third vibration sections serve dual purposes: they are part of the piezoelectric substrate structure and simultaneously function as temperature sensors. This integration eliminates the need for separate temperature detection devices while improving temperature measurement accuracy through direct thermal contact.
Solution Approach 2:
The quartz substrate acts as an intermediary that couples the oscillation section and detection sections thermally. By forming all sections on the common quartz substrate, the patent creates an efficient thermal pathway that allows the detection sections to accurately sense the temperature of the oscillation section without requiring separate temperature sensors.
3Manufacturing precision
If the second and third vibration sections are formed on surfaces cut at the same cutting angle as the first vibration section, then manufacturing precision is improved, but the frequency-temperature characteristic provides small frequency change resulting in low temperature detection resolution
Solution Approach 1:
The patent applies local quality by giving different cutting angles to different vibration sections on the same quartz substrate. The first vibration section uses a cutting angle optimized for frequency stability (small frequency change with temperature), while the second and third vibration sections use different cutting angles optimized for temperature detection resolution (large frequency change with temperature). This allows each section to have locally optimized properties for its specific function.
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 enables precise temperature detection and compensation by allowing the second and third sections to provide high resolution of temperature changes, enhancing the overall precision of temperature detection and oscillation signal stability across varying temperature ranges.
Implementation Method 1
a piezoelectric substrate including a first vibration section
Implementation Method 2
a second vibration section and a third vibration section which are different from each other and are provided on the piezoelectric substrate
Data Source
AI summary
A vibration device includes a quartz substrate including a first vibration section, a second vibration section, and a third vibration section, a pair of first excitation electrodes formed at two principal surfaces of the quartz substrate, a pair of second excitation electrodes so formed as to sandwich the second vibration section in the thickness direction of the quartz substrate, and a pair of third excitation electrodes so formed as to sandwich the third vibration section in the thickness direction of the quartz substrate. At least one of the pair of second excitation electrodes is formed at a first inclining surface that inclines with respect to the two principal surfaces. At least one of the pair of third excitation electrodes is formed at a second inclining surface that inclines with respect to the two principal surfaces. The second inclining surface inclines with respect to the first inclining surface.