Radiation Tube Layout With In-Vacuum Gate Voltage Regulation
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Solution Overview
Problem
The existing radiation sources are relatively large due to the need for a significant distance between the constant voltage supply unit and the housing, which increases the overall size of the radiography apparatus, particularly when a movement mechanism is involved.
Innovation Solution
Integrating the constant voltage supply unit, including a Zener diode and smoothing capacitor, directly onto the same substrate as the electron emitting unit within the vacuum tube of the radiation tube, and using booster circuits to supply boosted voltages to the anode and cathode units, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the constant voltage supply unit is provided outside the vacuum tube, then the housing can accommodate it with sufficient distance from the outer wall, but the overall size of the radiation source increases
Solution Approach 1:
The constant voltage supply unit is integrated inside the vacuum tube by mounting the Zener diode and smoothing capacitor on the cathode unit substrate. This merging of the voltage supply function into the existing cathode unit structure eliminates the need for separate housing space, thereby reducing the overall radiation source size while maintaining reliable voltage supply to the gate electrode
2Volume of moving object
If the constant voltage supply unit is integrated inside the vacuum tube, then the radiation source size is reduced, but the distance between the supply unit and housing outer wall is insufficient
Solution Approach 1:
The Zener diode serves as an intermediary component that provides voltage regulation and isolation. By placing the Zener diode in parallel with the gate electrode and cathode unit inside the vacuum tube, it acts as a mediator to maintain stable voltage conditions without requiring excessive distance from the housing outer wall, thus enabling compact design while preserving voltage supply reliability
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 configuration enables a smaller size for the radiation source while maintaining effective voltage supply and radiation generation, addressing the size constraints of traditional designs.
Implementation Method 1
a cathode unit 90 having an emitter electrode 92 which emits electrons
Implementation Method 2
an anode unit 74 having an anode surface 75 which collides with the electrons to generate radiation R
Implementation Method 3
a constant voltage supply unit 70 that supplies a constant driving voltage to the gate electrode 96
Data Source
AI summary
A radiation tube that is used in a radiation source for radiography includes: an electron emitting unit that includes a cathode unit having an emitter electrode which emits electrons and a gate electrode; an anode unit that has an anode surface facing the cathode unit and collides with the electrons to generate radiation; a constant voltage supply unit that supplies a constant driving voltage to the gate electrode; and a vacuum tube that accommodates the constant voltage supply unit, the electron emitting unit, and the anode unit.