Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1993-11-08
1997-08-12
Tran, Huan H.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 214
Patent
active
056570635
ABSTRACT:
An ink jet apparatus applies a drive voltage to electrodes formed on portions of side walls made of piezoelectric ceramics and varies the internal volumes of grooves adjacent to the side walls using the action of a deformation produced by a piezoelectric thickness/slip effect of the piezoelectric ceramics. Thereby, ink stored inside the grooves is ejected. According to such an ink jet apparatus, a void ratio of the piezoelectric ceramic is 10% or less, and an average crystal grain diameter of the piezoelectric ceramics is 10 .mu.m or less. Further, a variation in a ratio d.sub.15 /S.sub.E44 of a piezoelectric constant d.sub.15 of the piezoelectric ceramic to an elastic compliance S.sub.E44 thereof between the side walls falls within 4. A ratio H/W of a height H of each side wall to a width W thereof ranges from above 2 to below 9, and a ratio d.sub.15 /S.sub.E44 of a piezoelectric constant d.sub.15 of the piezoelectric ceramic to an elastic compliance S.sub.E44 thereof is 10 or more. It is thus possible to provide an ink jet apparatus having excellent durability and high reliability.
REFERENCES:
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4887100 (1989-12-01), Michaelis et al.
patent: 5016028 (1991-05-01), Temple
patent: 5248998 (1993-09-01), Ochiai et al.
patent: 5252994 (1993-10-01), Narita et al.
Brother Kogyo Kabushiki Kaisha
Tran Huan H.
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