Patent ID: 8154719
Filing Date: 2012-04-10
Classification: G01N

Abstract:
1. A mask inspection apparatus, comprising: a light source; an illuminating optical system configured to irradiate a mask with an inspection light emitted from the light source; a magnifying optical system configured to cause the inspection light with which the mask is irradiated to form an optical image; and an image sensor configured to acquire the optical image, wherein, the image sensor has an environmental radiation shielding member of heavy metal having a specific gravity equal to or greater than that of tantalum (Ta) at least on a side of a package opposite to a receiving surface of a sensor chip which receives the optical image, the environmental radiation shielding member is in contact with the package of the image sensor, and a plane area of the environmental radiation shielding member is larger than a plane area of the image sensor and smaller than a plane area of the package.