Patent ID: 8154718

Claim:
An apparatus for inspecting an encapsulated or unencapsulated micro-structured device on a semiconductor substrate, comprising: a support for supporting the semiconductor substrate, a reflected-light illumination system for illuminating the semiconductor substrate by visible light and infrared light, which lights are reflected from the semiconductor substrate and the micro-structured device as visible reflected light and infrared reflected light, a transmitted-light illumination system for illuminating the semiconductor substrate by infrared light simultaneously with the illumination of the reflected-light illumination system, the infrared light having a spectral portion which is transmitted as infrared transmitted light through the semiconductor substrate as if the semiconductor substrate is transparent thereto, wherein the micro-structured device is at least partly non-transparent to the infrared transmitted light, a CCD camera for capturing a visual image from the visible reflected-light and an IR camera for capturing an infrared image from the transmitted infrared light and the reflected infrared light simultaneously, a computation unit for processing the visual image and the infrared image, to output them as a combined image on a monitor, and wherein the apparatus lacks any light source separated from the IR camera by the substrate that generates light, to which the substrate is non-transparent, passing past an external edge of the substrate and captured by the IR camera capturing the image.