Ultrasonic liquid ejecting unit and method for making same

摘要

An ultrasonic liquid ejecting unit comprises a piezoelectric transducer coated with a conductive film on each of its front and rear surfaces, a nozzle plate secured to the transducer to form a bimorph vibration system and a body having a liquid chamber defined by the nozzle plate in pressure transmitting relation with the liquid in the chamber. The nozzle plate is coated on each of its front and rear surfaces with a pattern of adjoining regions of cement-active and cement-inactive properties. The cement-active region on the front surface conforms to the rear surface of the transducer and the cement-active region of the rear surface conforms to a contact surface of the body. When fabricating the unit, a cementing material in liquid phase, such as molten solder, is applied to each surface of the nozzle plate to exclusively wet the cement-active regions prior to contacting the nozzle plate to the transducer and to the body.