Dual-Blade Shutter Assembly for Luminescence Analyzer Detector Protection
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Solution Overview
Problem
Existing luminescence-based analytical instruments are bulky and not suitable for portable or handheld use, as they expose sensitive detectors like photomultiplier tubes to high-intensity light, increasing the risk of damage and requiring larger, less efficient designs to mitigate this risk.
Innovation Solution
A compact shutter assembly with toothed arms and light transmitting apertures, driven by a stepper motor gear, allows for precise linear motion between open and closed positions, protecting the detector during illumination and enabling efficient, high-speed operation with low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the detector is widely separated from the high intensity light source and path barriers are provided, then the detector is protected from harmful light exposure, but the instrument size increases and portability is reduced
Solution Approach 1:
The shutter assembly divides the protection function into two separate shutter blades that can independently control light transmission. Each blade has a toothed arm that engages with a motor gear, allowing the protection function to be segmented across multiple components rather than requiring a single large barrier, thus reducing overall instrument volume while maintaining detector protection.
Solution Approach 2:
The invention transitions from a single-plane shutter to a dual-blade configuration where the second shutter blade is positioned adjacent and parallel to the first. This dimensional arrangement allows the apertures to overlap and create a more effective light barrier in three-dimensional space, providing superior protection without increasing the instrument's footprint.
2Volume of moving object
If a compact design is used to reduce instrument size for portability, then the instrument becomes suitable for non-laboratory settings, but the risk of harmful exposure of the detector to the light source increases
Solution Approach 1:
The second shutter blade is positioned adjacent and parallel to the first shutter blade, with their light transmitting apertures arranged to overlap when in the open position. This nested arrangement creates a layered protection system where the overlapping apertures provide redundant protection pathways, allowing compact instrumentation while maintaining robust detector protection against stray light.
Solution Approach 2:
The shutter assembly is positioned between the light source and detector to preemptively block harmful light before it can reach the detector. The dual-blade design with overlapping apertures provides preliminary protection at multiple stages, allowing the instrument to maintain a compact form factor while preventing detector exposure through pre-positioned barriers.
3Device complexity
If a single shutter blade is used, then the mechanism is simpler, but the light blocking effectiveness is reduced
Solution Approach 1:
The shutter protection function is segmented into two separate blades, each with its own toothed arm that engages with the motor gear. This segmentation allows each blade to contribute to light blocking independently, creating overlapping protection zones that enhance effectiveness while keeping each individual blade component simple and manageable.
Solution Approach 2:
The invention adds a second shutter blade positioned in a parallel plane adjacent to the first blade. This dimensional addition creates overlapping aperture regions that provide superior light blocking effectiveness, transforming a single-plane protection system into a multi-plane system without significantly increasing mechanical complexity.
4Device complexity
If the shutter blades move in the same direction, then the mechanism is simpler, but the aperture alignment precision is reduced
Solution Approach 1:
Instead of moving both shutter blades in the same direction, the invention has the first and second shutter blades move in opposite directions when the motor gear rotates. This inverted motion pattern allows the toothed arms to engage with opposite sides of the gear, creating a mechanical advantage that enhances aperture alignment precision through the gear's inherent tooth geometry while maintaining relatively simple mechanism complexity.
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 shutter assembly effectively protects sensitive detectors from high-intensity light, enabling a compact, portable, and energy-efficient luminescence-based sample analyzer capable of accurate analyses in non-laboratory settings while minimizing power requirements.
Implementation Method 1
A motor gear is disposed between, and meshed with, the first and second toothed arms such that rotation of the gear causes the first and second shutter blades to move linearly in opposite directions
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A shutter assembly includes a first shutter blade having a first toothed arm extending therefrom and a first light transmitting aperture therein, and a second shutter blade positioned adjacent and parallel to the first shutter blade. The second shutter blade has a second toothed arm extending therefrom and a second light transmitting aperture therein. The first and second shutter blades are supported to allow parallel linear motion. A motor gear is disposed between, and meshed with, the first and second toothed arms such that rotation of the gear causes the first and second shutter blades to move linearly in opposite directions between an open position in which the first and second light transmitting apertures are in an overlapping relationship with respect to one another, and a closed position in which the first and second light transmitting apertures are in a non-overlapping relationship with respect to one another.