Photocathode Electron Beam Control via Objective Lens Convergence
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Solution Overview
Problem
Current electron beam applicators with photocathode-based electron guns lack effective control mechanisms for electron beams, limiting their performance and efficiency.
Innovation Solution
An electron beam applicator and emission method that includes a photocathode, an objective lens, and a control unit to manage the convergence power of the lens based on the size of the electron beam emitted from the photocathode, optionally with an excitation light size control member and an intermediate electrode to adjust beam characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photocathode-based electron gun is used to emit bright and sharp electron beams, then electron beam quality is improved, but device complexity increases due to lack of established control mechanisms
Solution Approach 1:
The patent controls electron beam parameters by adjusting the convergence power of the objective lens and the size of excitation light. By changing these parameters, the system optimizes electron beam quality while maintaining manageable device complexity through systematic parameter control rather than adding complex structural components
Solution Approach 2:
The control unit monitors electron beam characteristics and adjusts the objective lens convergence power and excitation light size accordingly. This feedback mechanism enables automatic optimization of electron beam quality without requiring complex manual intervention or additional control components
2Measurement precision
If multiple lenses and control mechanisms are added to control electron beams from photocathode, then electron beam control precision is improved, but device size increases
Solution Approach 1:
The objective lens serves multiple functions: it focuses the electron beam and its convergence power can be adjusted to control beam characteristics. The excitation light source also serves dual purposes by enabling electron emission and its size control directly influences beam diameter. This multi-functionality reduces the need for additional dedicated components
Solution Approach 2:
The patent combines the functions of electron beam generation, focusing, and control into an integrated system where the objective lens and excitation light work together. By merging these functions rather than using separate dedicated components for each function, the device maintains compact size while achieving precise control
3Device complexity
If conventional thermionic emission type electron guns are used, then device simplicity and cost are maintained, but electron beam brightness and sharpness deteriorate
Solution Approach 1:
The patent controls electron beam parameters by adjusting the convergence power of the objective lens and the size of excitation light. By changing these parameters, the system optimizes electron beam quality while maintaining manageable device complexity through systematic parameter control rather than adding complex structural components
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
Simplifies control of electron beams, reduces device size, and enhances resolution and brightness by directly utilizing the high-quality electron beams from photocathodes without the need for additional lenses, enabling high-resolution imaging and efficient energy use.
Implementation Method 1
a photocathode that emits an electron beam in response to receiving excitation light emitted from the light source
Implementation Method 2
an objective lens that converges an electron beam emitted from the electron gun section
Data Source
AI summary
An object is to provide an electron beam applicator suitable for an electron gun having a photocathode and an electron beam emission method in the electron beam applicator. The object can be achieved by an electron beam applicator including: an electron gun section; a main body section; and a control unit. The electron gun section includes a light source, a photocathode that emits an electron beam in response to receiving excitation light emitted from the light source, and an anode. The main body section includes an objective lens that converges an electron beam emitted from the electron gun section. The control unit controls at least convergence power of the objective lens in accordance with a size of an electron beam emitted from the photocathode.