In a physical memory space, a pinned memory region is defined at one end of the space and a non-pinned region is defined at the other end of the space. A left and a right bit are stored in physically different areas of the charge trapping layer, near left and right regions of the memory cell, respectively. Moreover, the lighting apparatus 10 needs only small numbers of components and mounting man-hours. Subsequently, a second image is captured and stored. A void is formed in a peripheral region of device segment, through the first and third intermediate layers down to the substrate. When the supporting flange contacts against the supporting stage and then the second fastener is engaged with the first fastener, the displacement of the supporting flange along the axis and the rotation of the supporting flange about the axis relative to the supporting stage are limited, and the first electrical connector is coupled with the second electrical connector.