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Browse Prior Art Database

Piezoelectro-Hydraulic Print Actuator

IP.com Disclosure Number: IPCOM000060056D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Goldburt, E: AUTHOR [+2]

Abstract

Using a piezoelectro-hydraulic actuator provides a low-noise high efficiency actuator with a frequency response limited only by transducer response time and speed of a shock wave propagation. The figure shows a cross-sectional view of the actuator. The body 1 of the actuator consists of the two cavities 2, 3 filled with incompressible liquid, two "push-pull" piezoelectric plates 4, 5, and a plunger which penetrates both cavities. The two piezoelectric plates 4 and 5 act in antiphase in "pushpull" mode. Applying the electric pulse to plate 4 causes plunger 6 to move forward. Applying the electric pulse to plate 5 causes plunger 6 to move backwards. Plunger 6 has a hydrophobic coating 7 which prevents escape of fluid from actuator cavity 3 during the printing process.

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Piezoelectro-Hydraulic Print Actuator

Using a piezoelectro-hydraulic actuator provides a low-noise high efficiency actuator with a frequency response limited only by transducer response time and speed of a shock wave propagation. The figure shows a cross-sectional view of the actuator. The body 1 of the actuator consists of the two cavities 2, 3 filled with incompressible liquid, two "push-pull" piezoelectric plates 4, 5, and a plunger which penetrates both cavities. The two piezoelectric plates 4 and 5 act in antiphase in "pushpull" mode. Applying the electric pulse to plate 4 causes plunger 6 to move forward. Applying the electric pulse to plate 5 causes plunger 6 to move backwards. Plunger 6 has a hydrophobic coating 7 which prevents escape of fluid from actuator cavity 3 during the printing process. The orifice and the plunger diameters have to be as close as possible. To estimate the geometrical sizes of a piezoelectric plate, assume that the distance between the actuator edge and paper surface is 0.3 mm. Then if the actuator diameter is 75 mm, the volume created by the plate on applying of an electrical pulse would be Z0.003 mm3 (f (0.75)2 0.3/4). That means the plate of 3 mm2 area will be sent inside the cavity in Z1 m distance (3 mm2 0.001 mm = 0.003 mm3).

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