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Electron source manufacturing method

A manufacturing method and electron source technology, which are applied in the manufacture of discharge tubes/lamps, electrode systems, cold cathodes, etc., can solve problems such as the increase of energy amplitude and color difference, the stability of discharge current, and the inability to cope with it.

Active Publication Date: 2017-06-23
HITACHI HIGH-TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the front end of the conventional electron source is 0.8 μm or less, which is suitable for high-resolution observation of the sample with a small current. However, when it is intended to emit a large current, there are differences in the color difference caused by the deviation of the energy range and the stability of the emitted current. sexual problems and cannot cope

Method used

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  • Electron source manufacturing method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 2 A conceptual diagram showing an apparatus for processing substrates. The substrate 1 whose front end is sharpened by electrolytic grinding of tungsten single crystal filaments whose axis orientation is orientation is fixed in the heating element 2 and arranged in the vacuum container 4 . The heating element 2 is connected with a voltage source 6 for applying a voltage to the substrate 1, an ammeter 8 for measuring the amount of current discharged from the substrate 1, and a current source 5 for heating the heating element. In addition, a lead-out electrode 3 at ground potential is disposed near the substrate 1 , and an electric field is generated between the substrate 1 and the lead-out electrode 3 by applying a voltage to the heating element 2 . image 3 Represents details around the substrate.

[0040] The vacuum vessel 4 is vacuum exhausted from the 10 -4 Pa up to 10 -2 At a pressure of about Pa, the main component of the residual gas is water. In thi...

Embodiment 2

[0056] The so-called electrolytic polishing is a method of immersing a filament in an electrolytic solution and applying a voltage to grind the filament to produce a sharpened tip. However, at this time, the shape of the tip under the applied voltage of DC voltage and AC voltage is Different (hereinafter, the grinding based on DC voltage will be called DC electrolytic grinding, and the grinding based on AC voltage will be called AC electrolytic grinding). For tungsten single crystal filaments whose axis orientation is orientation, when direct current electrolytic polishing is performed, the angle (cone angle) of the conical portion at the tip of the substrate changes by alternating current electrolytic polishing. Figure 12 express its difference. When the front end is sharpened by DC electric field polishing, the front end of the substrate is ground into a curved shape, and the cone angle α becomes 10 degrees or less. When the substrate is sharpened by the method shown in E...

Embodiment 3

[0061] In the method of Example 1, the processing time of the substrate is arbitrarily determined, but it is possible to control the tip diameter by making the applied voltage constant and using the processing time as a parameter. When the voltage applied to the facility is 5kV and 3kV, the processing of the substrate starts immediately after the voltage is applied and ends every measured time (processing time), Figure 14 Represents a graph depicting the size of the diameter of the front end of the substrate. The horizontal axis represents machining time, and the vertical axis represents tip diameter. The diameter of the front end increases with a logarithmic function as the processing time increases, and gradually saturates. This saturated state is a state in which the front end diameter of the substrate is fixed to a certain thickness, and the larger the applied voltage, the larger the front end diameter becomes. Processing time to control the front diameter.

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Abstract

In the conventional substrate processing method, it is not possible to designate the size of the tip shape for fabrication, and it is not possible to obtain a substrate having a desired arbitrary diameter. In addition, impurities may adhere to the substrate. Using the relationship between the diameter of the front end of the substrate and the applied voltage or the enclosed time when the front end of the substrate is being processed, the applied voltage to obtain the desired front end diameter is controlled to process the substrate. Thereby, a substrate having a desired arbitrary diameter can be produced within a range in which the tip diameter of the sharpened tungsten single crystal filament is in the range of 0.1 μm to 2.0 μm.

Description

technical field [0001] The present invention relates to a method for manufacturing an electron source, and in particular, to a processing method for adjusting the diameter of the tip of a substrate portion serving as an electron beam emission source to a desired size. The substrate processed in this way is used in equipment using electrons extracted into a vacuum, such as electron beam application equipment such as electron microscopes and electron beam exposure equipment, scanning tunneling microscopes (STM) using tunneling currents, and atomic force using atomic forces. Probe microscopes such as microscopes (AFM) and charged particle beam devices for observing / processing / inspecting samples such as ion microscopes. Background technique [0002] When a strong electric field is applied on the metal surface, the potential barrier has a slope at the junction with the vacuum, when the electric field becomes 10 9 When the V / m series is higher than that, the potential barrier bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02H01J1/16H01J1/30H01J37/06
CPCH01J1/16H01J1/30H01J9/02H01J37/06H01J1/3044H01J9/025H01J9/042H01J37/073H01J2237/06341H01J2237/06316C25F3/26H01J37/065H01J37/285H01J2237/063
Inventor 市村崇新田久雄薗部信之赵福来村越久弥
Owner HITACHI HIGH-TECH CORP
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