Height detection apparatus and charged particle beam apparatus
First Claim
1. A height detection apparatus configured to project a pattern on a sample arranged at any of a plurality of reference positions and configured to detect a height of the sample from the reference position on the basis of the pattern reflected from the sample, the apparatus comprising:
- a projection optical system that generates a plurality of spatially separated light beams each having the pattern and projects the generated spatially separated light beams onto the sample;
an imaging element that images the pattern reflected from the sample;
a detection optical system that guides the pattern reflected from the sample to the imaging element; and
at least one optical path length correction member disposed on an optical path different from an optical path having a shortest optical path length among a plurality of optical paths corresponding to the plurality of light beams at a position where the plurality of light beams is spatially separated.
2 Assignments
0 Petitions
Accused Products
Abstract
A height detection apparatus is configured to project a pattern on a sample arranged at any of a plurality of reference positions and configured to detect a height of the sample. The apparatus includes: a projection optical system that generates a plurality of spatially separated light beams each having the pattern and projects the generated spatially separated light beams onto the sample; an imaging element that images the pattern reflected from the sample; a detection optical system that guides the pattern reflected from the sample to the imaging element; and at least one optical path length correction member disposed on an optical path different from an optical path having a shortest optical path length among a plurality of optical paths corresponding to the plurality of light beams at a position where the plurality of light beams is spatially separated.
-
Citations
12 Claims
-
1. A height detection apparatus configured to project a pattern on a sample arranged at any of a plurality of reference positions and configured to detect a height of the sample from the reference position on the basis of the pattern reflected from the sample, the apparatus comprising:
-
a projection optical system that generates a plurality of spatially separated light beams each having the pattern and projects the generated spatially separated light beams onto the sample; an imaging element that images the pattern reflected from the sample; a detection optical system that guides the pattern reflected from the sample to the imaging element; and at least one optical path length correction member disposed on an optical path different from an optical path having a shortest optical path length among a plurality of optical paths corresponding to the plurality of light beams at a position where the plurality of light beams is spatially separated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification