Electron Gun Heater Circuit for Autonomous Beam Current Compensation
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Solution Overview
Problem
Existing electron gun systems require complex monitoring and control mechanisms to compensate for the decrease in electron beam amount due to cathode electrode deterioration, leading to increased device cost and complexity.
Innovation Solution
An electron gun design where a heater with a shared terminal generates heat using a low-voltage power supply, and the cathode electrode forms thermal electrons, with the cathode current flowing in the opposite direction to the heater current, allowing autonomous compensation of electron beam reduction without the need for monitoring or additional control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monitoring means and control means are added to compensate for electron beam decrease, then the electron beam amount can be maintained, but the device complexity and cost increase
Solution Approach 1:
The patent implements self-service by utilizing the inherent cathode current flow through the heater to automatically compensate for electron beam decrease. The system uses its own operational parameters (cathode current) to regulate heater temperature and maintain electron emission without external monitoring or control systems. This eliminates the need for additional sensors, controllers, and associated complexity while maintaining reliable electron beam output.
Solution Approach 2:
The patent implements feedback by using the cathode current flowing through the heater as an automatic feedback mechanism. As cathode emission decreases over time, the changing current directly affects heater temperature, which in turn regulates electron emission. This creates a self-regulating feedback loop that maintains stable electron beam output without requiring external monitoring or control systems.
2Reliability
If heater current is increased to compensate for cathode deterioration, then electron beam amount is maintained, but the system requires complex monitoring and control
Solution Approach 1:
The system performs self-service by automatically adjusting heater current based on the cathode's actual emission state. The cathode current flowing through the heater naturally regulates the heating power according to the cathode's deteriorating condition, eliminating the need for external monitoring or manual control while maintaining reliable electron beam output.
Solution Approach 2:
The patent utilizes parameter changes by allowing the heater current to vary naturally with cathode deterioration. As the cathode emits fewer electrons, the changing current parameter automatically adjusts the heater temperature to compensate, maintaining stable electron beam output without requiring complex control mechanisms.
3Extent of automation
If a low-voltage power supply is connected to the heater with opposite current flow, then autonomous compensation is achieved, but the circuit configuration becomes specific
Solution Approach 1:
The system achieves autonomous compensation through self-service by using the cathode current flowing in opposition to the heater current from the low-voltage power supply. This configuration allows the heater temperature to be automatically regulated by the interaction of these two currents, maintaining stable electron emission without external control while using a straightforward circuit topology.
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 design autonomously compensates for the decrease in electron beam amount due to cathode electrode deterioration, resulting in a reliable and cost-effective electron gun system with a simplified structure.
Implementation Method 1
a heater (12), including one terminal as a heater terminal and another terminal as a shared terminal, to generate heat by current supply from a low-voltage power supply being connected between the terminals
Implementation Method 2
a cathode electrode (11), connected to the shared terminal, to form thermal electrons by being heated by the heater
Data Source
AI summary
The purpose is to make it possible to autonomously suppress a reduction in an electron beam without providing a means for supervising the electron beam intensity of a monitor or the like. An electron gun, provided with: a heater (12) in which one terminal serves as a heater terminal (H) and the other terminal serves as a shared terminal (HK), and in which a low-voltage power supply (21) is connected between the terminals, the heater (12) generating heat due to a current being supplied from the low-voltage power supply (21); and a cathode electrode (11) connected to the shared terminal (HK) and heated by the heater (12) to discharge thermal electrons. A cathode current (Ik) due to the thermal electrons discharged from the cathode electrode (11), and a current (Ih) due to the low-voltage power supply, flow in opposite directions through the heater (12).