In order to reduce and render uniform the surface roughness and variations in thickness of a layer after detachment of a donor substrate, the mean temperature of the donor substrate during implantation thereof is controlled so as to be in the range 20\xb0 C. A frustoconical countersink extends around the opening of the bore into the forward surface and a tungsten carbide collar is fitted into the countersink. The second ground electrode is aligned with the center electrode in the radial direction of the center electrode to form a second spark gap, across which side sparks are discharged when the insulator is fouled with carbon. The frame members are adapted to comprise one or more apertures. When the image processing apparatus 102 inputsoutputs image data through driver software installed in the host computer 101, the apparatus 102 identifies an existenceabsence of a forgery prevention function in the driver software. Each module is individually configurable to perform predetermined processing and data storage functions including specification of dimensions for which processing is to be applied, and collectively configurable in a linear communication path so as to define unique data analysisdetection flows.