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Image detection apparatus

  • US 6,097,483 A
  • Filed: 03/01/1999
  • Issued: 08/01/2000
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Term
First Claim
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1. An image detection apparatus comprising:

  • a) a tilt stage capable of holding an object and inclining a surface of the object;

    b) an illumination system designed so as to illuminate the surface with light;

    c) a detection optical system to form an image of the surface;

    d) a photoelectric detector, that photoelectrically detects said image;

    e) an inclination detection apparatus in communication with said tilt stage, designed to detect said inclination and to provide an output signal corresponding to said inclination;

    f) an image distortion correction unit, electrically connected to said photoelectric detector and said inclination detection apparatus, designed so as to substantially eliminate said amount of distortion in said image and form a substantially distortion-free image; and

    g) an image processing unit, electrically connected to said image distortion correction unit, that inspects surface in said substantially distortion-free image.

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