Patent ID: 7969584

Claim:
A measuring method, comprising: measuring an angle of a side wall of a concave portion formed in an insulating film with a bottom surface thereof; defining a plurality of parameter groups including an angle of a side wall of a concave portion formed in the insulating film with a bottom surface thereof, a dimensional width in a predetermined depth position of said concave portion, and a dimensional depth of said concave portion, and preparing a library storing a plurality of waveforms of reflected lights respectively correlated with said plurality of parameter groups; irradiating light over a concave portion formed in the insulating film; detecting reflected light from said concave portion irradiated with light; referencing the detected waveform of reflected light with the stored waveform selected from said library; if a difference between the detected waveform of reflected light and the stored waveform selected from said library is equal to or larger than a specified value, then referencing the detected waveform of reflected light with the stored waveform selected from said library again, and if the difference between the detected waveform of reflected light and the stored waveform selected from said library is lower than the specified value, then assigning said parameter group correlated with the waveform selected from said library for values indicating the geometry of said concave portion irradiated with light, said assigned parameter group including said dimensional width of the concave portion, said dimensional depth of the concave portion and said angle of the side wall of the concave portion with the bottom surface thereof; and determining the geometry of said concave portion from said value indicating the geometry of said concave portion, wherein, in said plurality of parameter groups in said defining plurality of parameter groups, the angles of the side wall of said concave portion with the bottom surface thereof are the same in the parameter groups, and at least any one of the other parameters including said dimensional width of the concave portion and said dimensional depth of the concave portion are different by the parameter groups, and wherein the angle of the side wall of said concave portion with the bottom surface thereof is a measured value obtained in said measuring the angle of the side wall of the concave portion with the bottom surface thereof.