Scanning electron microscope
First Claim
1. A scanning electron microscope for observing a sample by irradiating the sample with an electron beam emitted from an electron source and focused by condenser lenses, and detecting secondary electrons or backscattered electrons from the sample, comprising:
- a Wehnelt electrode or an anode electrode adapted to change an accelerating voltage; and
an objective aperture adapted to regulate the electron beam, whereinthe condenser lenses comprise both an electromagnetic coil-type condenser lens and a permanent magnet-type condenser lens,the permanent magnet-type condenser lens is arranged in the scanning electron microscope to focus the electron beam emitted from the electron source,the electromagnetic coil-type condenser lens is arranged in the scanning electron microscope after the permanent magnet-type condenser lens to focus the electron beam focused by the permanent magnet-type condenser lens, andthe electromagnetic coil-type condenser lens is adapted to be controlled to change a position in an up/down direction of a cross-over created between the electromagnetic coil-type condenser lens and an objective lens, to adjust a spot size on the sample, and to adjust a probe current.
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Accused Products
Abstract
There is provided a scanning electron microscope capable of achieving a size reduction of the device while at the same time suppressing the increase in column temperature as well as maintaining performance, e.g., resolution, etc. With respect to a scanning electron microscope for observing a sample by irradiating the sample with an electron beam emitted from an electron source and focused by condenser lenses, and detecting secondary electrons from the sample, the condenser lenses comprise both an electromagnetic coil-type condenser lens and a permanent magnet-type condenser lens.
14 Citations
6 Claims
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1. A scanning electron microscope for observing a sample by irradiating the sample with an electron beam emitted from an electron source and focused by condenser lenses, and detecting secondary electrons or backscattered electrons from the sample, comprising:
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a Wehnelt electrode or an anode electrode adapted to change an accelerating voltage; and an objective aperture adapted to regulate the electron beam, wherein the condenser lenses comprise both an electromagnetic coil-type condenser lens and a permanent magnet-type condenser lens, the permanent magnet-type condenser lens is arranged in the scanning electron microscope to focus the electron beam emitted from the electron source, the electromagnetic coil-type condenser lens is arranged in the scanning electron microscope after the permanent magnet-type condenser lens to focus the electron beam focused by the permanent magnet-type condenser lens, and the electromagnetic coil-type condenser lens is adapted to be controlled to change a position in an up/down direction of a cross-over created between the electromagnetic coil-type condenser lens and an objective lens, to adjust a spot size on the sample, and to adjust a probe current. - View Dependent Claims (2, 3, 4)
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5. A scanning electron microscope for observing a sample by irradiating the sample with an electron beam emitted from an electron source and focused by condenser lenses, and detecting secondary electrons or backscattered electrons from the sample, comprising:
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a Wehnelt electrode or an anode electrode adapted to change an accelerating voltage; and an objective aperture adapted to regulate the electron beam, wherein the condenser lenses comprise both an electromagnetic coil-type condenser lens and a permanent magnet-type condenser lens, the electromagnetic coil-type condenser lens is arranged in the scanning electron microscope to focus the electron beam emitted from the electron source, the permanent magnet-type condenser lens is arranged in the scanning electron microscope after the electromagnetic coil-type condenser lens to focus the electron beam focused by the electromagnetic coil-type condenser lens, and the electromagnetic coil-type condenser lens is adapted to be controlled to change a position in an up/down direction of a cross-over created between the electromagnetic coil-type condenser lens and an objective lens, to adjust a spot size on the sample, and to adjust a probe current. - View Dependent Claims (6)
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Specification