An improved sheet accumulator for stacking serially fed sheets transported on a paper path. Each component layer or sheet is manufactured at a fiberizing station and laminated together at a combining station. Then, for example, when the same memory cell row is accessed, a voltage level of the power supply line is raised by a coupling capacitance of the word lines. Then, the still-image recorder performs a recording process in accordance with the still-image electronic shutter speed when the light-amount becomes the standard light-amount.