Heat-Conducting Element for Sensor Chip Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Length measuring devices face measurement inaccuracies due to temperature changes caused by heat generation from electrical components, particularly sensor chips, which are not adequately dissipated, leading to scale length changes and measurement errors, despite efforts to control temperature changes within the device.
Innovation Solution
A thermally conductive element is introduced between the heat-generating sensor chip and the driver, creating a heat conduction path that transfers heat generated by the sensor chip to the driver, allowing for heat dissipation outside the housing while maintaining precise guidance of the scanning unit in the measuring direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical components (sensor chip) are integrated in the scanning unit to achieve compact design and fail-safe measurement generation, then device functionality and measurement reliability are improved, but heat generation increases causing scale length changes and measurement inaccuracies
Solution Approach 1:
The harmful heat generated by the sensor chip is extracted and separated from the scale by introducing a thermally conductive element that creates a dedicated heat conduction path to the driver, isolating the thermal influence from the measurement-critical scale component
Solution Approach 2:
A thermally conductive element serves as an intermediary between the sensor chip and the driver, facilitating heat transfer from the electrical component to the driver while preventing direct thermal coupling between the heat source and the scale, thus protecting the scale from temperature changes
2Measurement precision
If scanning distance is reduced to less than 100 μm to achieve high resolution, then measurement resolution is improved, but the scanning unit generates more heat that disproportionately heats the scale due to small distance
Solution Approach 1:
The heat generated by the sensor chip during high-resolution scanning is converted from a harmful effect into a manageable thermal flow by directing it through the thermally conductive element to the driver, where it can be dissipated without affecting the scale temperature
Solution Approach 2:
The thermally conductive element acts as an intermediary that intercepts heat from the sensor chip before it can reach the scale, providing a controlled thermal pathway that prevents disproportionate heating of the scale despite the reduced scanning distance
3Temperature
If cooling medium is introduced to temper the interior to match machine tool temperature, then temperature stability is improved, but heat generated by electrical components is not adequately addressed
Solution Approach 1:
The cooling medium approach is supplemented by extracting heat at its source through the thermally conductive element connected to the sensor chip, actively removing heat before it can affect the scale rather than relying solely on ambient temperature matching
Solution Approach 2:
The thermally conductive element serves as a thermal intermediary that directly connects the sensor chip to the driver's heat dissipation path, creating a dedicated heat removal mechanism that works in conjunction with or replaces the cooling medium approach
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 solution enables high measuring accuracy and reproducible position measurements by effectively dissipating heat away from the scale, reducing measurement errors caused by temperature changes, and ensuring a compact mechanical structure with fail-safe value generation and transmission.
Implementation Method 1
a heat-conducting element (19), which is designed to be attached to the electrical component (13) to transfer heat generated to the driver (14)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The length measuring device consists of an encapsulated scale (20) and a sensor chip (13) of a scanning unit (10) that scans the scale (20). A driver (14) is rigidly coupled to the scanning unit (10) via a coupling (15) in the measuring direction X and movable transversely to it. The heat generated by the sensor chip (13) is directed away from the scale (20) to the driver (14). For this purpose, a heat-conducting element (19) is coupled to the sensor chip (13), leading to the driver (14), and is designed to be flexible to compensate for the movements permitted by the coupling (15).