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OPTICAL INSPECTION SYSTEM HAVING OPTICAL TELECENTRIC SCANNING SYSTEM COMBINED WITH TELECENTRIC CONDENSER LENS
OPTICAL INSPECTION SYSTEM HAVING OPTICAL TELECENTRIC SCANNING SYSTEM COMBINED WITH TELECENTRIC CONDENSER LENS
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机译:结合有光学电容式镜头的光学检查系统的光学检查系统
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摘要
PURPOSE: To provide an optical system used for detecting a flaw, blister, dust, foreign matter, etc., of a liquid crystal display glass plate, a semiconductor wafer, a reticule or a mask glass blanks at high speed and at high S/N ratio. ;CONSTITUTION: A laser is used as a light source, a telecentric scanning optical system is disposed, and an object to be, inspected is placed in the focal position of the optical system. A telecentric condenser lens 4 is disposed in such a manner that the focal plane is directed to the focal plane of a first telecentric scanning optical system and aligned therewith. In the rear side outgoing pupil of the condenser lens 4, zero-order diffracted light is missed by filtering, and only the scattered light is taken in. The telecentric scanning optical system and the telecentric condenser lens are combined together.;COPYRIGHT: (C)1995,JPO
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