The invention relates to a clamping device for the steering column of a motor vehicle, said device comprising two jaw-shaped components running vertically parallel to one another, between which a casing tube of the steering column extends and which have two opposing through-openings. The infrared-reflecting layer has a reflectance of 60% or more and a permeability of 25% or less with respect to infrared rays having a wavelength within a range of 800 to 1600 nanometers. The electroactive metal includes metal flakes of an average aspect ratio greater than about 5. A groove is formed in the tab surface portion positioned between the area to which the semiconductor element is fixed and wire connection areas to which the wires are connected, the groove being formed so as to surround the semiconductor element fixing area, thereby preventing peeling-off between the tab to which the semiconductor element is fixed and the resin which constitutes the package. Also, as the anode is moved over the wafer, the first and second electrodes are controlled to connect with the wafer while ensuring that the anode does not pass over an electrode that is connected.