Crystal Unit Sensor Layout for Accurate Temperature Compensation
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Solution Overview
Problem
Existing crystal units with integrated temperature sensors face challenges in achieving accurate temperature compensation due to significant temperature differences between the quartz-crystal vibrating piece and the temperature sensor, particularly in narrow clearance spaces, making it difficult to mount the sensor effectively.
Innovation Solution
A single-chamber or H-shaped crystal unit design where the temperature sensor is positioned close to the securing portions of the quartz-crystal vibrating piece, with its longitudinal surface parallel to a line segment connecting these portions, allowing for efficient heat transfer and minimizing temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature sensor is mounted in a narrow clearance space between support pads, then the device complexity is reduced by using a single-chamber structure, but the ease of manufacture deteriorates due to difficulty in mounting the sensor
Solution Approach 1:
The temperature sensor is oriented with its longitudinal axis extending in the depth direction of the chamber, perpendicular to the plane containing the support pads. This dimensional reorientation allows the sensor to fit within the narrow clearance space between support pads while maintaining proper thermal contact with the quartz-crystal vibrating piece, resolving the mounting difficulty in the single-chamber structure
Solution Approach 2:
The temperature sensor is positioned within the limited space defined by the support pads and the quartz-crystal vibrating piece, effectively nesting the sensor within the structural constraints of the single chamber. This nested arrangement allows all components to coexist in the single chamber without requiring additional mounting space
2Ease of operation
If the temperature sensor is positioned far from the quartz-crystal vibrating piece, then the ease of operation improves for sensor mounting, but the measurement precision deteriorates due to temperature difference
Solution Approach 1:
The temperature sensor is positioned specifically at the location where thermal conditions closely match those of the quartz-crystal vibrating piece, namely within the narrow clearance space between support pads where heat conduction conditions are similar. This localized positioning ensures the sensor measures the same temperature environment as the crystal, improving measurement precision for temperature compensation
3Measurement precision
If the clearance between support pads is reduced to improve temperature compensation accuracy, then the measurement precision improves, but the ease of manufacture deteriorates due to difficulty in mounting the temperature sensor
Solution Approach 1:
Instead of reducing the clearance between support pads in the horizontal plane, the solution utilizes the depth direction dimension by orienting the temperature sensor's longitudinal axis perpendicular to the support pad plane. This allows the sensor to be mounted within the existing clearance space without requiring further reduction of the horizontal gap, maintaining manufacturability while achieving accurate temperature measurement
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 significantly reduces the temperature difference between the quartz-crystal vibrating piece and the temperature sensor, enhancing temperature compensation accuracy and practicality of sensor mounting.
Implementation Method 1
heat conduction conditions of the temperature sensor and the quartz-crystal vibrating piece are relatively identical because the temperature sensor is disposed near the support position of the quartz-crystal vibrating piece
Data Source
AI summary
A single-chamber-type temperature-sensor-provided crystal unit includes: a single chamber; and a quartz-crystal vibrating piece and a temperature sensor, provided in the single chamber. The quartz-crystal vibrating piece has a square planar shape. The quartz-crystal vibrating piece is secured in the single chamber at two securing portions via conductive members. The two securing portions are in proximities of both ends of a first side of the quartz-crystal vibrating piece. The temperature sensor has a rectangular parallelepiped shape. The temperature sensor is disposed such that a longitudinal surface of the temperature sensor is parallel to a line segment Y and the temperature sensor is close to a side of the two securing portions within the single chamber, when a line segment connecting the two securing portions is defined as the line segment Y.