| 摘要 |
<p>The invention relates to a device for inspecting the upper surfaces of successive objects, for instance the mouth (10) edges of glass bottles (3) carried by a conveyor belt (2) and guided thereby past the device, which device is provided with an optical system, comprising: a lighting system with a light source (16) for lighting an upper surface of each object, and an optical imaging system (20) for forming in each case an image of an upper surface. measuring means for measuring the height of one edge at a time, and adjustment means for setting the optical system on the basis of the height of an edge as determined by the measuring means. A very simple embodiment is one in which the adjustment means comprise an optical element displaceable along the optical axis. Such an optical element can be given a lighter form than a light source and is moreover a passive element so that difficulties with cables are not encountered.</p> |
