Patent ID: 7643136

Claim:
A device for visual inspection of narrow spaces and objects in narrow spaces at substrate surfaces including: an image ray deflecting device for deflecting light having an entrance opening or side for light, an image sensor for detecting light deflected by the image ray deflecting device, and an illumination system for illuminating the narrow spaces or the object or objects to be inspected, the illuminating system including light sources located internally in the device, and close to or at the transmission path of light from the image ray deflecting device to the image sensor, and light guides, the light sources directly connected to upper ends of the light guides, the light guides extending substantially from the light sources down to the vicinity of the image ray deflecting device, and lower ends of the light guides arranged or connected to issue illuminating light at the sides of or from points located at the sides of the light entrance opening or side of the image ray deflecting device, wherein the light guides have lower end portions directing light from their lower end surfaces in directions having a tilt in the range of 10-20° in relation to a longitudinal axis of the device seen in the direction of an axis of light incoming to and deflected by the image ray deflecting device.