Patent ID: 7925390
Filing Date: 2011-04-12
Classification: F24F,Y02B

Abstract:
1. An inspection apparatus for detecting a defect on a substrate, comprising: a first casing having a first fan-filter-unit; a second casing having a second fan-filter-unit, the second casing is smaller than the first casing and being adjacent to the first casing; a clean chamber which is defined by a part of wall of the first casing and the second casing; a shutter arranged on the wall of the first casing to communicate with the clean chamber; a third casing having a third fan-filter-unit and surrounding the second casing; a pod for accommodating the substrate; a carrier apparatus for carrying the substrate from the pod to the clean chamber and being arranged in the first casing; an optical type inspection apparatus for inspecting a defect on the substrate and being arranged in the clean chamber; a first pressure measuring unit for measuring a first pressure in an external environment; a second pressure measuring unit for measuring a second pressure within the first casing; a third pressure measuring unit for measuring a third pressure within the clean chamber; a fourth pressure measuring unit for measuring a fourth pressure within the third casing; and a control unit for controlling the first, second and third fan-filter-units based on the first, second and third pressures.