Ultrasonic liquid ejecting apparatus
First Claim
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1. 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.
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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.
194 Citations
13 Claims
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1. An ultrasonic liquid ejecting apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification