Ultrasonic liquid ejecting apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorNaoyoshi Maehara
Life of this patent
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Abstract
An ultrasonic liquid ejecting apparatus for discharging liquid droplets comprises a housing including a chamber for holding liquid therein having an intake port connected to a liquid supply container. A bimorph vibrator system is provided comprising a vibrating member secured to the housing in pressure transmitting relation with the liquid in the chamber and a piezoelectric transducer secured to the vibrating member for inducing a displacement therein to discharge a small quantity of liquid through an nozzle opening formed in the vibrating member. A circuit is provided for exciting the transducer at a frequency corresponding to the resonant frequency of the vibrator system.
Claims13
An ultrasonic liquid ejecting apparatus comprising:
- a housing including a chamber for holding liquid therein having an intake port connected to a liquid supply container;
- a vibrator system including a vibrating member secured to said housing in pressure transmitting relation with the liquid in said chamber so that the vibrating member defines a front wall of said chamber and having at least one nozzle opening therein and a piezoelectric transducer secured to said vibrating member for inducing therein a displacement at each vibration to discharge a small amount of liquid through said nozzle opening;
- means in communication with said chamber for maintaining static pressure therein at a value equal to or lower than pressure in front of the vibrating member;
- and
- means for exciting said transducer at a frequency substantially equal to the resonant frequency of said vibrator system.
Dependencies are inferred from the claim text.