Resonant Electron Beam Deflection Coil Circuit
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Solution Overview
Problem
Conventional x-ray systems face challenges in achieving fast, stable, and adjustable magnetic deflection of electron beams, which is crucial for enhancing image quality, due to complex and costly high-voltage components and variability between x-ray tubes.
Innovation Solution
A control circuit with a first and second low voltage source, switching devices, and a resonance capacitor is used to create current paths and generate offset currents in an electron beam manipulation coil, allowing for precise control of the electron beam's deflection through a resonance cycle and current shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic deflection is used to enhance image quality by ensuring fast and stable electron beam positioning, then image quality is improved, but the system becomes complex and expensive due to high voltage parts
Solution Approach 1:
The patent replaces the conventional mechanical/electrostatic deflection system with a magnetic deflection system using a deflection coil. The coil generates a magnetic field that acts on the electron beam, providing faster and more stable deflection control. This substitution of the deflection mechanism achieves superior image quality while the resonant circuit design keeps the control system manageable.
Solution Approach 2:
The patent employs a resonant circuit consisting of a capacitor and inductor that operates at a specific resonant frequency to drive the deflection coil. This periodic action at resonance enables fast and stable magnetic field generation, allowing the electron beam to be quickly positioned without requiring complex high-voltage switching circuits. The resonant oscillation naturally provides the rapid response needed for high-quality imaging.
2Ease of operation
If conventional high voltage switching circuits are used for magnetic wobbling, then magnetic deflection can be achieved, but the system becomes bulky and expensive
Solution Approach 1:
The patent uses a resonant circuit that oscillates at its natural frequency to drive the deflection coil, eliminating the need for complex high-voltage switching circuits. The resonant oscillation provides the necessary periodic current variation for magnetic wobbling in a compact and cost-effective manner.
Solution Approach 2:
The patent changes the operating parameters by utilizing the resonant frequency of the LC circuit formed by the capacitor and inductor. By operating at this specific frequency, the system achieves efficient magnetic deflection with minimal component complexity. The resonant condition allows the circuit to self-sustain oscillations, reducing the need for additional control electronics.
3Device complexity
If electrostatic e-beam deflection is used to achieve wobble, then implementation is simpler, but image quality is reduced compared to magnetic deflection
Solution Approach 1:
The patent substitutes electrostatic deflection with magnetic deflection using a deflection coil. The magnetic field generated by the coil interacts with the electron beam, providing faster response times and more stable positioning. This substitution maintains relative simplicity while significantly improving image quality through enhanced beam control.
Solution Approach 2:
The resonant circuit provides periodic current variation that generates corresponding magnetic field oscillations. This periodic magnetic action on the electron beam achieves the desired wobble effect with superior speed and stability compared to electrostatic methods, thereby improving image quality without excessive 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
This approach enables fast, stable, and adjustable magnetic deflection of the electron beam, improving image quality by minimizing resistive and switching losses, and allowing for easy adjustments in scanning parameters, regardless of x-ray tube variations.
Implementation Method 1
A deflection coil mounted on the x-ray tube and positioned to deflect the stream of electrons
Implementation Method 2
A resonance capacitor is coupled in parallel with the deflection coil and positioned along the first and second current paths
Data Source
AI summary
An apparatus and method for magnetic control of an electron beam includes a control circuit having a first low voltage source and a second low voltage source. The control circuit also includes a first switching device coupled in series with the first low voltage source and configured to create a first current path with the first low voltage source when in a closed position and a second switching device coupled in series with the second low voltage source and configured to create a second current path with the second low voltage source when in a closed position. The control circuit further includes a capacitor coupled in parallel with an electron beam manipulation coil and positioned along the first and second current paths and a current source circuit electrically coupled to the electron beam manipulation coil and constructed to generate an offset current in the first and second current paths.