Patent ID: 8319960

Claim:
An inspection apparatus for detecting a defect of an object comprising: an irradiation system which irradiates the object with light; a detection system which accumulates light from the object, said detection system including an aberration correction system configured to correct aberration of said light from said object, wherein said aberration correction system comprises a plurality of lenses lining up in a direction including an axis of said lenses so as to correct aberration of light acquired by said system, wherein said lenses have substantially elliptical shapes, each of said elliptical shapes including a first side and a second side facing each other, and two elliptical arcs facing each other, wherein at least one of said first side and said second side is substantially straight, and a distance between said first side and said second side is smaller than a distance between said two elliptical arcs, wherein said detection system includes a sensor for detecting light corrected by said aberration correction system, and wherein said detection system includes an objective lens, said objective lens being arranged between a mounting position of said object substrate and said aberration correction system, wherein said objective lens has substantially elliptical shapes, each of said elliptical shapes including a third side and a fourth side facing each other, and two elliptical arcs facing each other, wherein at least one of said third side and said fourth side is substantially straight, and a distance between said third side and said fourth side is smaller than a distance between said two elliptical arcs.