Patent ID: 6426510
Filing Date: 2002-07-30
Classification: G01N

Abstract:
A pattern shape inspection device comprising:a light source for irradiating inspection light; a scanning unit for scanning the inspection light; an inspection light dividing unit for dividing the inspection light scanned by the scanning unit into plural parts; a monitor light detecting unit for receiving a first of the inspection lights divided by the inspection light dividing unit and converting the first part of the inspection lights into a monitor signal; a transmitting light detecting unit for receiving a transmitting light, which has transmitted through a pattern shape, a second part of the inspection light divided by the inspection light dividing unit, and converting the transmitting light into a transmission detecting signal; a waveform shaping unit for removing an alternate current component, within a primary scanning time period of the scanning unit, of monitor signals outputted from the monitor light detecting unit at each round of the primary scanning to convert the monitor signals into a rectangular-shaped wave of an nominally constant value; a first correction unit for dividing the transmission detecting signal by the rectangular-shaped wave which has undergone shaping in the waveform shaping unit; and a second correction unit for dividing the transmission detecting signals corrected in the first correction unit with predetermined reference transmitting signals as a divisor group and outputting the results of said division as an inspection image.