Gas Detection Apparatus Joint Member Rotation Axis
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Solution Overview
Problem
Existing gas detection apparatuses experience sensitivity fluctuations due to thermal expansion, which causes distortions in the optical path and alters the relative positions of optical surfaces, affecting the accuracy of gas detection.
Innovation Solution
A gas detection apparatus with a joint member that serves as a rotation axis, securely joining the substrate and light guide member, minimizing thermal expansion-induced distortions by using a columnar joint member with a high elastic modulus, resistant to deformations, and maintaining the optical path integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical path pipe is securely joined to the substrate and case by grooves and fixing members, then the structural stability is improved, but thermal expansion causes distortions of the substrate and case to be transmitted to the optical path pipe, distorting the optical path or altering the relative positions of optical surfaces
Solution Approach 1:
The optical path pipe is divided into a fixed portion (joined to substrate) and a movable portion (rotatable around joint member). This segmentation allows the fixed portion to maintain structural stability while the movable portion accommodates thermal expansion through rotation, preventing distortion transmission to the optical path.
Solution Approach 2:
The joint member acts as an intermediary between the substrate and the optical path pipe. It serves as a rotation axis that decouples the thermal expansion movements of the substrate/case from the optical path pipe, allowing relative movement without transmitting distortions to the optical components.
2Measurement precision
If the substrate and light guide member are rigidly joined, then the positional stability is improved, but thermal expansion induces deformations that alter the relative positions of optical surfaces
Solution Approach 1:
The connection between substrate and light guide member is made dynamic through the joint member that serves as a rotation axis. This allows the light guide member to rotate relative to the substrate in response to thermal expansion, maintaining optimal optical alignment while accommodating dimensional changes, thus preserving both positional stability and detection sensitivity.
3Reliability
If fixing members are used to secure the optical path pipe, then the assembly stability is improved, but the thermal expansion distortions are transmitted to the optical path pipe
Solution Approach 1:
The fixing members are removed from the optical path pipe connection. Instead, the optical path pipe is fixed to the substrate by grooves without additional fixing members, eliminating the transmission path for thermal expansion distortions while maintaining assembly reliability through the groove fixation and rotatable joint mechanism.
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
The solution effectively suppresses optical path distortions and maintains gas detection sensitivity by allowing the light guide member to rotate relative to the substrate, ensuring accurate gas detection even under thermal expansion, thereby reducing fluctuations in sensitivity.
Implementation Method 1
In case of a thermal expansion, the thermal expansion may cause distortions of the substrate and the case
Implementation Method 2
a light emitting element provided in a first region in a main surface of the substrate for emitting light
Implementation Method 3
a light guide member for guiding the light emitted by the light emitting element to the light receiving element
Implementation Method 4
a light receiving element provided in a second region in the main surface of the substrate for receiving the light
Data Source
AI summary
Provided is a gas detection apparatus which suppresses occurrences of distortions of the optical path to reduce fluctuations of the gas detection sensitivity. A gas detection apparatus 1 includes a substrate 2; a light emitting element 3 disposed in a first region 21 in a main surface 20 of the substrate 2 for emitting light; a light receiving element 4 disposed in a second region 22 in the main surface 20 of the substrate 2 for receiving the light; a light guide member 5 for guiding the light emitted by the light emitting element 3 to the light receiving element 4; and a joint member 6 joining the substrate 2 and the light guide member 5. The joint member 6 serves as a rotation axis when the light guide member 5 is displaced relative to the substrate 2.