Crystal Unit With Inclined Side Surfaces For Temperature Compensation
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Solution Overview
Problem
Existing crystal units face challenges in accurately compensating for temperature changes due to the time delay in temperature detection by the temperature sensor, which can deviate from the actual temperature of the crystal blank, affecting the precision of oscillation frequency compensation.
Innovation Solution
The crystal unit incorporates a temperature sensor mounted within the package, with a crystal blank having inclined side surfaces, allowing for improved temperature tracking and reduced time delay by positioning the temperature sensor to detect temperature changes on the surface of the package, closely matching the temperature changes of the crystal blank, and using a conductive adhesive for efficient thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is mounted outside the package, then the device complexity is reduced, but the measurement precision deteriorates due to time delay in temperature detection
Solution Approach 1:
The temperature sensor is integrated inside the package cavity, merging the temperature detection function with the protective housing structure. This eliminates the external mounting configuration and reduces the thermal path between the crystal blank and sensor, thereby improving measurement precision without significantly increasing overall device complexity.
Solution Approach 2:
A support structure with thermal conduction capability is introduced as an intermediary between the crystal blank and temperature sensor. This mediator efficiently transfers heat from the crystal blank to the sensor, reducing thermal response time and improving temperature detection accuracy while maintaining a compact internal package layout.
2Reliability
If the crystal blank has perpendicular side surfaces, then the manufacturing precision is easier to achieve, but the thermal conduction efficiency deteriorates
Solution Approach 1:
The side surface geometry of the crystal blank is changed from perpendicular to inclined, modifying the thermal contact area and orientation between the crystal blank and support structure. This parameter change enhances thermal conduction efficiency by improving surface contact, while the inclined angle is designed to remain within manufacturable tolerances.
3Measurement precision
If the temperature sensor detects ambient temperature, then the device complexity is reduced, but the measurement precision deteriorates due to deviation from actual crystal blank temperature
Solution Approach 1:
The temperature sensor is extracted from the ambient environment and placed inside the sealed package cavity, directly adjacent to the crystal blank. This extraction eliminates the thermal path through external air and packaging materials, reducing thermal response time and ensuring the sensor measures the actual crystal blank temperature rather than ambient temperature.
Solution Approach 2:
A thermally conductive support structure serves as an intermediary that directly couples the crystal blank to the temperature sensor. This mediator creates an efficient thermal pathway that minimizes thermal response time, allowing the sensor to quickly track temperature changes of the crystal blank without detecting ambient temperature delays.
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 enhances the precision of temperature compensation by reducing the difference between detected and actual temperatures, improving the stability and accuracy of the oscillation frequency of the crystal element.
Implementation Method 1
using a conductive adhesive for efficient thermal conductivity
Data Source
AI summary
A crystal unit includes a package, a crystal element, and a temperature sensor. The crystal element includes a crystal blank and a pair of excitation electrodes on a pair of major surfaces of the crystal blank and is air-tightly sealed in the package. The temperature sensor is mounted in the package. The crystal blank includes a crystal plane inclined relative to the major surfaces in at least a portion of the side surfaces.