A first metal layer is formed on a back face of a silicon carbide substrate to a degree such that the first metal layer does not fully cover the back face of the silicon carbide substrate. Contest points may be partially or completely allocated between sub-contests in sub-contest fields. Lateral tubes extend from the constricted intermediate section so as to form an acute angle relative to both the central and cross-sectional axes of the constricted intermediate section, thereby preventing leakage of liquid out through the lateral tubes during use and subsequent handling. The present invention also facilitates transportation of electronic devices in containers within the arm harness of the present invention. By changing the angle of the movable mirror in at least two directions, the incident angle can be changed, and a hologram recorded in an angle multiplexed manner can be reconstructed. And the AD device may be implemented in, among other things, a signal processing device.