Patent ID: 9074886
Filing Date: 2015-07-07
Classification: G01B,G01C,G01N

Abstract:
1. A line-width measurement device comprising: a platform having a measurement area; an image capturing device mounted above the platform and being used to capture an image of a pattern under measurement in the measurement area; a controller connected to the image capturing device and receiving the image of the pattern under measurement captured by the image capturing device; and a color-mixing light source device mounted above the platform, including a plurality of monochromatic light sources and adjusting brightness scale of each of the monochromatic light sources according to a matching rate between the image of the pattern under measurement and an image of a standard pattern so as to provide suitable color-mixed lights for illumination, wherein the color-mixing light source device includes a red light source, a blue light source and a green light source, wherein the controller is further used to convert the image of the pattern under measurement to a gray scale image, and then compare the gray scale image with the image of the standard pattern so as to confirm the matching rate between the gray scale image and the image of the standard pattern; the controller is further used to measure the widths of lines in the gray scale image when the matching rate is larger than or equal to 80%, and to control the color-mixing light source device to adjust the brightness scale of each of the monochromatic light sources when the matching rate is lower than 80%.