Patent ID: 7648221

Claim:
A droplet ejecting apparatus, comprising: a head unit including (a) a cavity unit constituted by a plurality of plate members stacked on each other and adhered to each other with an adhesive, having a first outer surface and a second outer surface respectively defined by a first outermost plate member and a second outermost plate member of the plurality of plate members which are opposite to each other and one of which has a plurality of nozzles, and having a plurality of liquid flow channels formed therein and respectively communicating with the plurality of nozzles, and (b) an actuator attached to the cavity unit and operable such that the head unit ejects droplets through the plurality of nozzles; a holder which holds the head unit; a reinforcing plate which is adhered to the cavity unit of the head unit so that the holder holds the head unit; an adhesive layer interposed between the first outer surface of the cavity unit and a first surface of the reinforcing plate as one of opposite surfaces thereof so as to adhere the cavity unit and the reinforcing plate to each other, and having a non-adhesive area in which no adhesive exists; and a measuring section configured such that a measurement for estimating a thickness of the adhesive layer by using the non-adhesive area is performed therein.