Patent ID: 7304730

Claim:
An apparatus configured to inspect an object, said apparatus comprising: a first optical system configured to expose a first portion of the object with a first light beam; a second optical system configured to expose a second portion of the object with a second light beam, the second portion of said object being substantially spaced from said first portion; a first sensor configured to sense a transmitted image of said first portion of said object, said transmitted image corresponding to a portion of said first light beam passing through said first portion of said object, and generate first image data in response to said transmitted image; a second sensor configured to sense a reflected image of said second portion of said object, said reflected image corresponding to a portion of said second light beam reflected off said second portion of said object, and generate second image data in response to said reflected image; a third optical system configured to focus said transmitted image on to said first sensor, and focus the reflected image on to the second sensor; and a defect detecting circuit configured to detect a defect of said object based upon said first and second image data, wherein the first optical system comprises a first aperture configured to block a portion of a first input light beam supplied to said first optical system, a remaining portion of said first input light beam corresponding to said first light beam, and said second optical system comprises a second aperture configured to block a portion of a second input light beam supplied to said second optical system, a remaining portion of said second input light beam corresponding to said second light beam.