A development unit for a printing device is described. Plural pixel columns are arranged in one direction, plural pixels are arranged in a different direction to the one direction in a column manner in the pixel column, and the pixel includes a photodiode PD, a reset transistor M4 for resetting the photodiode PD, and a source follower input transistor M3 for receiving a signal from the photodiode PD. The resulting product exhibits characteristics superior to most engineered wood products. The Si sputtering target comprises, for example, an Si sintered material of 70 to 95% relative density. The simulator can detect a condition for inserting seed candidate solutions into the population. The resistivity of the actuator heater can be sensed so as to adjust the pulse widths to maintain a constant energy irrespective of the heater resistivity.