Patent ID: 7365295
Filing Date: 2008-04-29
Classification: G02B

Abstract:
1. An image inspection system comprising: a mount stage on which a subject to be inspected is mounted; an observation optical system for imaging light reflected by the subject so as to observe the object; a focal position moving mechanism for relatively moving a position of the observation optical system in a depth direction of focus with respect to the subject on the mount stage; a light branching device for making light reflected by the subject on the mount stage branch away from the observation optical system; a focal position detecting mechanism for detecting a first target focal position with respect to the subject by using light branching away via the light branching device, wherein the focal position detecting mechanism has a correction optical system for imaging the light branching away via the light branching device, and the correction optical system is movably arranged along the optical axis; a focal position correcting device for determining a second target focal position with respect to the subject, wherein the second target focal position is offset from the first target focal position; a driving device for driving the focal position moving mechanism so as to focus on the second target focal position; and a storage section for storing condition setting data for each subject, which includes at least one offset value for determining the second target focal position, wherein the focal position correcting device determines the second target focal position by moving the correction optical system along the optical axis in accordance with one of said at least one offset value in the condition setting data.