A hairclip includes two clip members and a connecting rod. The copolymer, when used as a radiation-sensitive resin, can give a high-performance cured film excellent in hardness, solvent resistance, and thermal stability. For each of the GI mode division signals, a respective peak-value position and a respective peak-value is determined to be used for determining the GI and FFT modes of the IQ stream. First electrodes are provided on the downwards surfaces of the first and second photoelectric conversion cells, and second electrodes are provided on their upwards surfaces.