Light-emitting device, driving method of light-emitting device, light-emitting chip, print head and image forming apparatus

摘要

A light-emitting device includes: plural light-emitting chips each having plural light-emitting elements, and each being designated, as a control target for lighting up or not lighting up, by two to Q designation signals (Q is an integer of two or more); and a selection signal generating part that selectively transmits P selection signals (P is an integer of three or more where P>Q) as the designation signals to designate each of the plural light-emitting elements as the control target, the designation signals for each of the plural light-emitting chips including a combination of two to Q selection signals taken from the P selection signals.