Patent ID: 9404732
Filing Date: 2016-08-02
CPC Classification: G01B,H05K

Claim Text:
1. An electronic component thickness measurement method comprising the steps of: applying a first electromagnetic wave from obliquely above to an electronic component and a transparent plate on which the electronic component is mounted; receiving reflected waves of the first electromagnetic wave and forming first image data including a first reference line representing an intensity peak of a reflected wave reflected from an upper surface of the electronic component and a plurality of second reference lines representing respective intensity peaks of a plurality of reflected waves reflected from the transparent plate; applying a second electromagnetic wave, which is different from the first electromagnetic wave in a direction of polarization, from obliquely above and at a same angle as the first electromagnetic wave, to a position on the electronic component and the transparent plate identical or substantially identical to a position to which the first electromagnetic wave is applied; receiving reflected waves of the second electromagnetic wave and forming second image data including a first reference line representing an intensity peak of a reflected wave reflected from the upper surface of the electronic component and a plurality of second reference lines representing respective intensity peaks of a plurality of reflected waves reflected from the transparent plate; extracting, from a plurality of the second reference lines in the first image data and a plurality of the second reference lines in the second image data, only a second reference line at which a difference in intensity peak between respective second reference lines at a same position in the first image data and the second image data is smallest, and forming third image data including the first reference line and the extracted second reference line; and calculating a thickness of the electronic component from a distance between the first reference line and the second reference line in the third image data.