Patent ID: 9683947
Date: 2017-06-20
CPC Classifications: G01N,G03F

Claim:
1. A detect inspection device configured to inspect a defect in a pattern of an inspection sample, comprising: a light source; a first beam splitter configured to branch light from the light source into a first optical path and a second optical path; a first optical system disposed on the first optical path and including a first lens having a first focal distance; a second optical system disposed on the second optical path and including a second lens having a second focal distance which is different from the first focal distance; a first aperture configured to form an illumination field of the inspection sample by light which has passed through the first optical system; a second aperture configured to form an illumination field of the inspection sample by light which has passed through the second optical system; a third optical system configured to illuminate, with a first illumination, an image of the first aperture on a first area of the inspection sample, and to illuminate, with a second illumination that is different from the first illumination, an image of the second aperture on a second area different from the first area of the inspection sample; a first imaging element configured to acquire light of the first area; a second imaging element configured to acquire light of the second area; a first microlens array disposed between the light source and the first beam splitter; a second beam splitter configured to make confluent the light of the first optical path and the light of the second optical path; a third beam splitter configured to branch light, which is made confluent by the second beam splitter, into a third optical path and a fourth optical path, to make light of the third optical path incident on the first aperture, and to make light of the fourth optical path incident on the second aperture; and a second microlens array disposed between the second beam splitter and the third beam splitter.