Charged Particle Beam Device and Information-Processing Device
First Claim
Patent Images
1. A charged particle beam apparatus comprising:
- a stage on which a sample is placed;
a charged particle beam optical system that irradiates the sample with a charged particle beam; and
a charged particle detection device that detects charged particles secondarily generated from the sample,wherein the charged particle detection device includes;
a photoelectric conversion unit that converts the charged particles from the sample into photons and converts the photons into an analog electric signal,an analog-to-digital conversion unit that converts the analog electrical signal into a digital signal, andan arithmetic unit that counts the digital signal, andthe calculation unit multi-values a signal per unit time in the digital signal with the use of a unit peak value related to one event generated when the sample is irradiated with one charged particle and outputs the multi-valued signal as a multilevel count value.
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Abstract
There is provided a charged particle beam apparatus capable of obtaining a high SN ratio with a small electron irradiation amount. The charged particle beam apparatus includes a charged particle detection device. The charged particle detection device detects an analog pulse waveform signal (110) in a detection of emitted electrons (1 event) when one primary electron enters a sample, converts the analog pulse waveform signal (110) into a digital signal (111), perform a wave height discrimination (112) with the use of a unit peak corresponding electron, and outputs the digital signal (111) as a multilevel count value.
16 Citations
15 Claims
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1. A charged particle beam apparatus comprising:
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a stage on which a sample is placed; a charged particle beam optical system that irradiates the sample with a charged particle beam; and a charged particle detection device that detects charged particles secondarily generated from the sample, wherein the charged particle detection device includes; a photoelectric conversion unit that converts the charged particles from the sample into photons and converts the photons into an analog electric signal, an analog-to-digital conversion unit that converts the analog electrical signal into a digital signal, and an arithmetic unit that counts the digital signal, and the calculation unit multi-values a signal per unit time in the digital signal with the use of a unit peak value related to one event generated when the sample is irradiated with one charged particle and outputs the multi-valued signal as a multilevel count value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An information processing apparatus comprising:
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an input unit that inputs detection information obtained by detecting the charged particles caused by the sample irradiated with the charged particle beam as a current value or a voltage value; and a determination unit that makes first determination of dividing the detection information into a first state, a second state, and a third state based on arbitrary first and second threshold values determined by a current value or a voltage value. - View Dependent Claims (12, 13, 14, 15)
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Specification