Laminate for use in manufacture of ink jet printheads
AssigneeXAAR Limited
InventorAnthony D. Paton
Life of this patent
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Abstract
A co-fired laminate (10) for use in printheads for drop-on-demand ink jet printers has two inner layers (12, 14) of piezoelectric material which are thickness poled in opposite senses, two outer layers (11, 15) of inactive material and a fifth layer (13) disposed between the inner layers which is electrically insulating under the printhead operating conditions and conductive under the poling conditions of the inner layers. The fifth layer preferably is an N.T.C. material with its critical temperature between the operating and poling temperatures. After poling of the inner layers further manufacture of the printhead from one side thereof can be effected as described.
Claims26
A co-fired laminate for use in the manufacture of printheads for drop-on-demand ink jet printers, comprising two inner layers of piezo-electric material and two outer layers of inactive ceramic material, characterized in that between said inner layers is provided a fifth layer of ceramic material which in response to actuating pulses at the operating temperature of the printhead is insulating and at the poling temperature of the inner layers is conductive during the poling period.
A co-fired laminate for use in the manufacture of printheads, comprising first and second layers of piezoelectric ceramic material which are thickness poled in opposite senses and an intermediate layer of ceramic material between said first and second layers of piezoelectric ceramic material, said ceramic material of the intermediate layer being insulating in response to actuating pulses at the operating temperature of the printhead and being conductive at the poling temperature of the first and second layers of piezoelectric ceramic material during the poling period.
Dependencies are inferred from the claim text.