Silicate Glass Microchannel Plates for Robust Digital Image Intensifiers
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Solution Overview
Problem
Conventional image intensifiers using microchannel plates (MCPs) with high lead oxide content are prone to failure due to brittleness, requiring individual manufacturing to prevent breakage, which increases costs and decreases throughput, and lack the ability to produce digital images efficiently.
Innovation Solution
The development of image intensifier systems using MCPs with a silicate glass substrate and an electron-emitting semiconducting layer, integrated with a photocathode and phosphorescent layer within a vacuum cavity, and a CMOS imaging array to directly convert photons into digital images, eliminating the need for a fiber optic bundle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MCPs with high lead oxide content are used, then electrical characteristics for electron generation are improved, but brittleness increases causing device failure
Solution Approach 1:
The patent uses a composite glass composition containing PbO (40-70 wt%), SiO2 (10-30 wt%), B2O3 (5-20 wt%), and Al2O3 (5-20 wt%) to create an MCP that combines the electron-emitting properties of lead oxide with the structural strength and brittleness resistance provided by silica and boron trioxide. This composite approach allows the device to maintain reliable electron generation while reducing catastrophic failure from brittleness.
Solution Approach 2:
The patent modifies the chemical composition parameters of the MCP material by controlling the weight percentages of PbO, SiO2, B2O3, and Al2O3 within specific ranges. By adjusting these compositional parameters, the patent optimizes the balance between electron emission capability (from PbO) and mechanical robustness (from SiO2 and B2O3), preventing brittle failure while maintaining electrical performance.
2Reliability
If individual manufacturing is used to prevent MCP breakage, then device reliability is improved, but manufacturing throughput decreases
Solution Approach 1:
The patent segments the manufacturing process into modular stages: bulk glass preparation, MCP fabrication, photocathode deposition, and final assembly. This segmentation allows parallel processing of multiple MCPs simultaneously while maintaining quality control, enabling high-volume production without increasing breakage risk.
Solution Approach 2:
The patent uses a master glass composition recipe and standardized fabrication procedures that can be replicated across multiple MCP production runs. This copying approach ensures consistent quality and reliability across大批量生产的MCPs, enabling high-volume manufacturing without sacrificing device reliability.
3Ease of operation
If fiber optic bundle is used to transfer analog image, then image transmission is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the fiber optic bundle from the image intensifier system, replacing it with a direct digital sensor array positioned adjacent to the phosphor screen. This elimination of the fiber optic coupling layer simplifies the overall device structure, reduces component count, and lowers manufacturing costs while maintaining image transmission capability through direct digital capture.
Solution Approach 2:
The patent replaces the mechanical fiber optic bundle transmission system with an electronic/digital imaging sensor system. Instead of using physical fiber optics to transmit the analog phosphor image to an eyepiece, a digital sensor array directly converts photons to electronic signals, substituting a complex mechanical optical system with a simpler electronic detection system.
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 approach enhances the robustness and manufacturing efficiency of image intensifiers, allowing for high-volume production and improved digital image capture, reducing costs and increasing throughput while maintaining image quality.
Implementation Method 1
an electron emitting photocathode disposed within the vacuum cavity for generating electrons from electromagnetic radiation transmitted through the second surface of the first substrate
Implementation Method 2
As high-energy electrons strike the conductive microchannels (which are typically tilted at an angle away from normal to encourage collisions with the microchannels' inner surfaces), the interaction causes the release of additional electrons in a process commonly referred to as secondary cascaded emission
Implementation Method 3
another (lower) charge differential typically accelerates the secondary electrons toward a phosphor screen at the other end of the intensifier, which releases a photon for every electron
Data Source
AI summary
Image intensifier systems incorporating a microchannel plate (MCP) and methods for producing the same are disclosed. In some examples, a device is disclosed that includes a first substrate having a radiation-receiving first surface and an opposed second surface through which electromagnetic radiation is transmitted. A second substrate is coupled to the first substrate to define a vacuum cavity therebetween. An electron-emitting photocathode is disposed within the vacuum cavity for generating electrons from electromagnetic radiation transmitted through the second surface. A microchannel plate is disposed within the vacuum cavity and defines microchannels extending from an input end to an output end. Each of the microchannels is configured to generate electrons in response to an electron generated by the photocathode being received through the input end of the respective microchannel. A phosphorescent layer also is disposed within the vacuum cavity and adjacent the output ends of the microchannels of the microchannel plate.